CA2018695C - Apparatus for clamping workpieces which have to be machined by a machine tool - Google Patents
Apparatus for clamping workpieces which have to be machined by a machine toolInfo
- Publication number
- CA2018695C CA2018695C CA002018695A CA2018695A CA2018695C CA 2018695 C CA2018695 C CA 2018695C CA 002018695 A CA002018695 A CA 002018695A CA 2018695 A CA2018695 A CA 2018695A CA 2018695 C CA2018695 C CA 2018695C
- Authority
- CA
- Canada
- Prior art keywords
- clamping
- frame members
- bores
- workpiece
- longitudinal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000003628 erosive effect Effects 0.000 description 4
- 230000001788 irregular Effects 0.000 description 4
- 230000036961 partial effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000002747 voluntary effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 235000012571 Ficus glomerata Nutrition 0.000 description 1
- 240000000365 Ficus racemosa Species 0.000 description 1
- 235000015125 Sterculia urens Nutrition 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/061—Work-clamping means adapted for holding a plurality of workpieces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H11/00—Auxiliary apparatus or details, not otherwise provided for
- B23H11/003—Mounting of workpieces, e.g. working-tables
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B1/00—Vices
- B25B1/06—Arrangements for positively actuating jaws
- B25B1/10—Arrangements for positively actuating jaws using screws
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B1/00—Vices
- B25B1/24—Details, e.g. jaws of special shape, slideways
- B25B1/2405—Construction of the jaws
- B25B1/241—Construction of the jaws characterised by surface features or material
- B25B1/2415—Construction of the jaws characterised by surface features or material being composed of a plurality of parts adapting to the shape of the workpiece
- B25B1/2421—Construction of the jaws characterised by surface features or material being composed of a plurality of parts adapting to the shape of the workpiece the parts having a linear movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B5/00—Clamps
- B25B5/06—Arrangements for positively actuating jaws
- B25B5/10—Arrangements for positively actuating jaws using screws
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jigs For Machine Tools (AREA)
- Clamps And Clips (AREA)
- Feeding Of Workpieces (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Connection Of Plates (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Gripping On Spindles (AREA)
Abstract
An apparatus for clamping workpieces which have to be machined by a machine tool. The apparatus comprises a rectangular frame including two longitudinal frame members and two transverse frame members. Clamping means are provided to fix the work-pieces to be machined to said rectangular frame. The clamping means comprise at least one auxiliary frame which is removably inserted in said rectangular frame. Each of the auxiliary frames includes two clamping bars which can be adjustably connected to each other and the ends thereof being adapted to be connected to the longitudinal frame members of the rectangular frame such that they are adjustable in the longitudinal direction of the longitudinal frame. The clamping bars comprise a plurality of continuous threaded bores running essentially perpendicular to the clamping bars, said bores being enlarged to a predetermined nominal diameter and said bores being adapted to selectively receive a clamping screw.
Description
20~869~
AN APPARATUS FOR CLAMPING WORKPIECES WHICH HAVE
TO BE MACHINED BY A MACHINE TOOL
BACKGROUND OF THE INVENTION
Field of the Invention The present invention refers to an apparatus for clamping work-pieces which have to be machined by a machine tool, the clamp-ing apparatus compris;ng a rectangular frame means including two longitudinal frame members and two transverse frame mem-bers, and clamping means adapted to fix the workpieces to be machined to the rectangular frame.
Further, the invention refers to a clamping bar adapted to be used in an apparatus for clamping workpieces which have to be machined by a machine tool.
Prior Art If a workpiece is to be machined by means of a machine tool, the workpiece has to be fixed or clamped in a suitable manner to the worktable of the machine tool or within the working area of the machine tool. It is well known in the prior art to pro-vide the worktable of the machine tool with undercut grooves which are adapted to receive displaceable clamping bolts. By 201869~
means of such clamping bolts and additionally by means of hoop-shaped fasteners a workpiece to be machined can be fixed to thc worktable of the machine tool. Such a clamping method is cum-bersome and time-consuming and often not suitable for small workpieces.
Furthermore, a clamping apparatus is known which comprises a frame provided with clamping members. Usually, according to a well known embodiment, one side of the frame is in the form of a stationary clamping jaw, and a further, displaceable jaw is provided which is under the influence of one or several clamp-ing screws, spindles or the like. Thus, the workpiece to be clamped can be fixed between the stationary and the displace-able jaw.
A main drawback of such a known clamping apparatus is that only one single or several workpieces having exactly identical size can be clamped. Another drawback is that such a clamping frame comprising a fixed and a displaceable jaw, if it is to be used for the clamping of big workpieces or a plurality of identical-ly sized small workpieces, is either tooflexible since it resi-liently deforms during clamping of the workpiece and workpie-ces, respectively, or is extraordinarily bulky and heavy if it is to be designed with the required rigidity.
, In many applications, particularly if a workpiece has to be machined by wire erosion, it is of paramount importance that - 201~9~
the clamping frame be designed to be open such that the erosion wire can pass through the clamping frame. This request renders it even more difficult to design such a clamping frarne such that it posses the required rigidity without being too bulky and heavy.
OBJECTS OF THE INVENTION
It is an object of the invention to provide a clamping appara-tus for clamping workpieces which have to be machined by a ma-chine tool which is light and manageable, but simultaneously presents an extraordinary high resistance against resilient deformation during the clamping of one or more workpieces.
It is a further object of the invention to provide a clamping apparatus for clamping workpieces which have to be machined by a machine tool by means of which, at will, either single big workpieces can be reliably and accurately clamped, even if they have irregular shape, or a plurality of small workpieces, even if they have different size.
It is a still further object of the invention to provide a clamping apparatus for clamping workpieces which have to be machined by an electro erosive process using a wire as erosion electrode by means of which, at will, either single big work-pieces can be reliably and accurately clamped, even if they 201869~
have irregular shape, or a plurality of small workpieces, even if they have different size.
SUMMARY OF THE INVENTION
In order to meet these and other objects, according to a first aspect, the invention provides an apparatus for clamping work-pieces which have to be machined by a machine tool. The appara-tus of the invention comprises, in a first general embodiment, a rectangular frame including two longitudinal frame members and two transverse frame members, and clamping means adapted to fix the workpieces to be machined to said rectangular frame.
The clamping means comprise at least one auxiliary frame which is removably inserted in said rectangular frame. Each of said auxiliary frames includes two clamping bars which can be ad-justably connected to each other. The ends thereof are adapted to be connected to the longitudinal frame members of said rec-tangular frame such that they are adjustable in the longitudi-nal direction of said longitudinal frame members.
The clamping bars comprise a plurality of first bores running essentially parallel to the longitudinal frame members when the clamping bars are connected to the longitudinal frame members, and said bores are adapted to selectively receive a clamping screw.
201869~
According to a second aspect of the invention, an apparatus for clamping workpieces which have to be machined by a machine tool is provided. In a second general embodiment, the apparatus com-prises a rectangular frame including two longitudinal frame members and two transverse frame members, and clamping means adapted to fix said workpieces to be machined to the rectangu-lar frame.
The clamping means comprise at least one auxiliary frame which is removably inserted in the rectangular frame. Each of said auxiliary frames includes two clamping bars which can be ad-justably connected to each other. The ends thereof can be con-nected to said longitudinal frame members of said rectangular frame such that they are adjustable in the longitudinal direc-tion of the longitudinal frame members.
The clamping bars comprise a plurality of continuous threaded bores running essentially perpendicular to the clamping bars, said bores being enlarged to a predetermined nominal diameter and said bores being adapted to selectively receive a clamping screw.
Such a design, either according to the first or the second as-pect of the invention, provides for the clamping of workpieces between two clamping bars which are roughly adjusted to the desired distance, i.e. to the width or length of the workpiece to be clamped. Thereafter, the clamping bars are provisionally 2~18695 fixed at their both ends to the two longitudinal frame mernbers of the rectangular frame. The real clamping of the workpiece or of the plurality of workpieces thereby is effected by means of the auxiliary frame or frames in a place which is optimally suited therefore such that the rectangular main frame is not subjected to any clamping forces.
The invention further provides a clamping bar adapted to be used in an apparatus according to the invention for clamping workpieces which have to be machined by a machine tool, in which said clamping bar comprises a plurality of continuous threaded bores running essentially perpendicular to said clamp-ing bar, said bores being enlarged to a predetermined nominal diameter.
The continuous threaded bores are in a position to perform three different functions:
1. In order to avoid a bending of the clamping bars, two ad-jacent bores of two cooperating clamping bars located im-mediately besides the workpiece to be clamped can be pro-vided with a continuous threaded bolt which is loosely inserted into the aligned bores and which is locked by means of a threaded nut.
2. Some of the threaded bores can be provided with stud screws to be clamped against the workpiece or workpieces ~ ~ 7 ~ 2~869~
received between the two clamping bars. In this way, it is possible to clamp irregularly formed workpieces or work-pieces with different dimensions.
AN APPARATUS FOR CLAMPING WORKPIECES WHICH HAVE
TO BE MACHINED BY A MACHINE TOOL
BACKGROUND OF THE INVENTION
Field of the Invention The present invention refers to an apparatus for clamping work-pieces which have to be machined by a machine tool, the clamp-ing apparatus compris;ng a rectangular frame means including two longitudinal frame members and two transverse frame mem-bers, and clamping means adapted to fix the workpieces to be machined to the rectangular frame.
Further, the invention refers to a clamping bar adapted to be used in an apparatus for clamping workpieces which have to be machined by a machine tool.
Prior Art If a workpiece is to be machined by means of a machine tool, the workpiece has to be fixed or clamped in a suitable manner to the worktable of the machine tool or within the working area of the machine tool. It is well known in the prior art to pro-vide the worktable of the machine tool with undercut grooves which are adapted to receive displaceable clamping bolts. By 201869~
means of such clamping bolts and additionally by means of hoop-shaped fasteners a workpiece to be machined can be fixed to thc worktable of the machine tool. Such a clamping method is cum-bersome and time-consuming and often not suitable for small workpieces.
Furthermore, a clamping apparatus is known which comprises a frame provided with clamping members. Usually, according to a well known embodiment, one side of the frame is in the form of a stationary clamping jaw, and a further, displaceable jaw is provided which is under the influence of one or several clamp-ing screws, spindles or the like. Thus, the workpiece to be clamped can be fixed between the stationary and the displace-able jaw.
A main drawback of such a known clamping apparatus is that only one single or several workpieces having exactly identical size can be clamped. Another drawback is that such a clamping frame comprising a fixed and a displaceable jaw, if it is to be used for the clamping of big workpieces or a plurality of identical-ly sized small workpieces, is either tooflexible since it resi-liently deforms during clamping of the workpiece and workpie-ces, respectively, or is extraordinarily bulky and heavy if it is to be designed with the required rigidity.
, In many applications, particularly if a workpiece has to be machined by wire erosion, it is of paramount importance that - 201~9~
the clamping frame be designed to be open such that the erosion wire can pass through the clamping frame. This request renders it even more difficult to design such a clamping frarne such that it posses the required rigidity without being too bulky and heavy.
OBJECTS OF THE INVENTION
It is an object of the invention to provide a clamping appara-tus for clamping workpieces which have to be machined by a ma-chine tool which is light and manageable, but simultaneously presents an extraordinary high resistance against resilient deformation during the clamping of one or more workpieces.
It is a further object of the invention to provide a clamping apparatus for clamping workpieces which have to be machined by a machine tool by means of which, at will, either single big workpieces can be reliably and accurately clamped, even if they have irregular shape, or a plurality of small workpieces, even if they have different size.
It is a still further object of the invention to provide a clamping apparatus for clamping workpieces which have to be machined by an electro erosive process using a wire as erosion electrode by means of which, at will, either single big work-pieces can be reliably and accurately clamped, even if they 201869~
have irregular shape, or a plurality of small workpieces, even if they have different size.
SUMMARY OF THE INVENTION
In order to meet these and other objects, according to a first aspect, the invention provides an apparatus for clamping work-pieces which have to be machined by a machine tool. The appara-tus of the invention comprises, in a first general embodiment, a rectangular frame including two longitudinal frame members and two transverse frame members, and clamping means adapted to fix the workpieces to be machined to said rectangular frame.
The clamping means comprise at least one auxiliary frame which is removably inserted in said rectangular frame. Each of said auxiliary frames includes two clamping bars which can be ad-justably connected to each other. The ends thereof are adapted to be connected to the longitudinal frame members of said rec-tangular frame such that they are adjustable in the longitudi-nal direction of said longitudinal frame members.
The clamping bars comprise a plurality of first bores running essentially parallel to the longitudinal frame members when the clamping bars are connected to the longitudinal frame members, and said bores are adapted to selectively receive a clamping screw.
201869~
According to a second aspect of the invention, an apparatus for clamping workpieces which have to be machined by a machine tool is provided. In a second general embodiment, the apparatus com-prises a rectangular frame including two longitudinal frame members and two transverse frame members, and clamping means adapted to fix said workpieces to be machined to the rectangu-lar frame.
The clamping means comprise at least one auxiliary frame which is removably inserted in the rectangular frame. Each of said auxiliary frames includes two clamping bars which can be ad-justably connected to each other. The ends thereof can be con-nected to said longitudinal frame members of said rectangular frame such that they are adjustable in the longitudinal direc-tion of the longitudinal frame members.
The clamping bars comprise a plurality of continuous threaded bores running essentially perpendicular to the clamping bars, said bores being enlarged to a predetermined nominal diameter and said bores being adapted to selectively receive a clamping screw.
Such a design, either according to the first or the second as-pect of the invention, provides for the clamping of workpieces between two clamping bars which are roughly adjusted to the desired distance, i.e. to the width or length of the workpiece to be clamped. Thereafter, the clamping bars are provisionally 2~18695 fixed at their both ends to the two longitudinal frame mernbers of the rectangular frame. The real clamping of the workpiece or of the plurality of workpieces thereby is effected by means of the auxiliary frame or frames in a place which is optimally suited therefore such that the rectangular main frame is not subjected to any clamping forces.
The invention further provides a clamping bar adapted to be used in an apparatus according to the invention for clamping workpieces which have to be machined by a machine tool, in which said clamping bar comprises a plurality of continuous threaded bores running essentially perpendicular to said clamp-ing bar, said bores being enlarged to a predetermined nominal diameter.
The continuous threaded bores are in a position to perform three different functions:
1. In order to avoid a bending of the clamping bars, two ad-jacent bores of two cooperating clamping bars located im-mediately besides the workpiece to be clamped can be pro-vided with a continuous threaded bolt which is loosely inserted into the aligned bores and which is locked by means of a threaded nut.
2. Some of the threaded bores can be provided with stud screws to be clamped against the workpiece or workpieces ~ ~ 7 ~ 2~869~
received between the two clamping bars. In this way, it is possible to clamp irregularly formed workpieces or work-pieces with different dimensions.
3. Some of the threaded bores can be provided with cylindri-cally shaped stop bars on which or against which the work-piece or the workpieces rests and rest, respectively. This measure is especially favourable if a plurality of identi-cal workpieces has to be clamped in the clamping apparatus of the invention in the same position one after the other one.
Further embodiments of the apparatus of the invention are cha-racterized in the claims 2 to 19.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following, two preferred embodiments of the apparatus of the invention will be further described, with reference to the accompanying drawings, in which:
Fig. 1 shows a top view of a first embodiment of the clamping apparatus of the invention with several workpieces clamped therein;
Fig. 2 shows a lateral view of a clamping bar ac-20~8~9~
cording to a first embodiment;
Fig. 3 shows a bottom view of the clamping bar oF
Fig. 2;
Fig. 4 shows a partial sectional view of the clamp-ing bar of Fig. 2, seen along the line IV-IV
in Fig. 2;
Fig. 5 shows a top view of a second embodiment of the clamping apparatus of the invention with several workpieces clamped therein;
Fig. 6 shows a lateral view of a clamping bar ac-cording to a second embodiment;
Fig. 7 shows a bottom view of the clamping bar of Fig. 6; and Fig. 8 shows a partial sectional view of the clamp-ing bar of Fig. 6, seen along the line VIII-VIII in Fig. 7.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
According to the schematic view shown in Fig. 1, a rectangular 9- 20~869~
frame is provided whicl- is generally designated with reference numeral 1. The rectangular frame 1 is fastened to the (not shown) work table of a machining tool by (not shown) Eixing means. The rectangular frame 1 comprises two transverse frame members 2 and 3 as well as two longitudinal frame members 4 and 5; the frame members 2 and 3 and the frame members 4 and 5 to-gether form a rigid rectangular frame structure. The two longi-tudinal frame members 4 and 5 are provided with threaded bores 6 equidistantly arranged in a row extending along the length of the frame members 4 and 5; said threaded bores 6 run in a di-rection perpendicular to the plane of the rectangular frame 1.
In the embodiment shown in Fig. 1, the rectangular frame 1 is provided with four identical clamping bars 7, 8, 9 and 10. The design of these clamping bars is shown in detail in Figs. 2 to 4 whereby, as an example, the clamping bar 7 is shown in a la-teral view in Fig. 2, in a bottom view in Fig. 3 and in a par-tial sectional view in Fig. 4.
The following description of the clamping bars particularly refers to the clamping bar 7. However it is understood that the following description also refers to the design of the clamping bars 8, 9 and 10.
The clamping bar 7 is constituted by a longitudinal bar member made of steel and having essentially rectangular cross section.
Both ends of the clamping bar 7 are provided with a flattened extension ll having less height dimension than the clamping bar itself. The length of the clamping bar 7 without the extensions 11 corresponds to the inner width of the rectangular frarne l, measured between the inner faces of the longitudinal frame mem-bers 4 and 5. The size of the extensions 11 is such that they at least partially cover the top faces of the longitudinal fra-me members 4 and 5 which are provided with the threaded bores 6. The clamping bar 7 being positioned in the rectangular frame 1, the extensions 11 rest on the top surfaces of the longitudi-nal frame members 4 and 5.
The extensions 11 are provided with longitudinal slits 12 running transversely with respect to the clamping bar 7. The design and position of said slits 12 is such that they lay over the threaded bores 6 in the longitudinal frame members 4 and 5 when the clamping bar 7 is positioned in the rectangular frame 1. The length of the slits 12 is somewhat greater than the distance between two adjacent threaded bores 6 such that each clamping bar 7, 8, 9 or 10 can be inserted into and fixed to the rectangular frame 1 at any voluntary position; thereby, the clamping bars run parallely to the transverse frame members 2 and 3. As can be furthér seen from Fig. 1, screws 13 are pro-vided which penetrate the slits 12 and which are screwed into the threaded bores 6 in order to fix the clamping bars 7, 8, 9 and 10 in a desired position.
One of the longitudinal head faces of the clamping bar 7 is ll- 201~69~
provided with a plurality of equidistantly positioned prismatic recesses 14. Between said recesses 14 a small p~ain portion o~
the longitudinal head face of the clamping bar 7 is provided.
Furthermore, the clamping bar 7 comprises a plurality of bores 15 running parallel to the plane of the rectangular ~rame 1 and extending transversely the the length of the clamping bar 7.
These bores 15 are located in said small plain portions of the longitudinal head face of the clamping bar 7, between the aforementioned prismatic recesses 14. Finally, additional bores 15a can be provided near to the two end portions of the clamp-ing bar 7 and close to the extensions 11.
The design of the bores 15 and 15a, respectively, can be seen from Fig. 4. Basically, the bores 15 and 15a are standard threaded bores; however, these standard threaded bores are en-larged to a predetermined nominal value n. Preferably, this nominal value n has a size which is essentially the mean value between the core bore diameter k and the nominal thread dia-meter g. In the example shown in Fig. 4, the threaded bores 15 and 15a, respectively, are provided with a metric M-10-thread, the nominal thread diameter thereof being lOmm. The core bore diameter of a M-10-thread is approximately 8.2mm. Thus, the nominal value to which the threaded bores 15 and 15a, respecti-vely, are enlarged, amounts to approximately 9mm.
Such a design allows to use the threaded bores 15 and 15a, re-spectively, for three different purposes:
20~8695 1. It is possible to screw M-10-screws or M-10-bolts into the bores 15 and 15a, respectively, whereby these screws or bolts are fixed against axial displacement.
2. It is possible to insert cylindrical bars having a dia-meter of 9mm into the bores 15 and 15a, respectively, which can be axially displaced, but which are received in said bores reliably and essentially without axial clearan-ce.
3. Screws or threaded bolts having a M-8-thread can be in-serted into the bores 15 and 15a, respectively, without being fixed against axial displacement.
Coming back to Fig. 1, the advantages of the aforementioned design will be explained further. As a first example, six cy-lindrical workpieces have to be clamped in the rectangular fra-me 1 such that their axes extend perpendicularly to the plane of the rectangular frame 1. For this purpose, the two clamping bars 7 and 8 are used in an orientation as shown in Fig. 1. The workpieces 16 align with the prismatic recesses 14 of the clamping bar 7 and, thus, are equidistantly positioned. The clamping bar 7 can be fixed to the rectangular frame 1 in any desired position by means of the screws 13. Then, the second clamping bar 8 is inserted into the rectangular frame 1, is displaced until it rests on the workpieces 16 and is slightly fixed to the longitudinal frame members 4 and 5 in such a man-2als6ss ner that it can be further displaced in the direction of the extension of the longitudinal frame members 4 and 5.
Now, all aligned pairs of threaded bores 15 of the two clamping bars 7 and 8 are provided with threaded bolts 17 and secured each with a nut 18. The nuts 18 are successively tightened in turn with the result that the clamping bar 8 which is but loo-sely fixed to the longitudinal frame members 4 and S is dis-placed towards the clamping bar 7 so as to clamp the workpieces 16 between the prismatic recesses 14 of the clamping bar 7 and the plain longitudinal head face of the clamping bar 8 directed towards the clamping bar 7. As soon as the workpieces 16 are securely clamped between the two clamping bars 7 and 8, the two fixing screws 13 of the clamping bar 8 can also be tightened.
Dùe to the fact that a threaded bolt 17 is provided directly besides each of the workpieces 16, any elastic deformation of the clamping bars 7 and 8 is avoided during the clamping there-of and all workpieces 16 are reliably clamped in the desired position.
As a second example, a hexaedral workpiece 19 shall be posi-tioned and clamped between the two clamping bars 9 and 10. One surface 20 of the hexaedral workpiece 19 is not plain and has an undefined shape. For this purpose, the clamping bar 9 is inserted into the rectangular frame 1 in a suitable position and fixed to the two longitudinal frame members 4 and 5 by - 14 - 201869~
means of the screws 13. Thereafter, the second clamping bar lO
is loosely inserted into the rectangular frame l with a certain distance to the clamping bar 9, such distance being somewhat more than the greatest size of the workpiece 19 in transverse direction. Now, two stop bars 2l having a diameter of 9mm are inserted into two aligned bore pairs 15 of the clamping bars 9 and lO in a certain distance from each other which is less than the length of the workpiece l9; in this way, each of the two stop bars 21 projects into the space between the two clamping bars 9 and 10.
In a next step, the workpiece l9 is put on the two stop bars 21 and between the two clamping bars 9 and lO; thereby, the height position and the parallel orientation with reference to the plane of the rectangular frame is fixed. Thereafter, the clamp-ing bar 10 is displaced towards the surface 20 of the workpiece 19 such that a small clearance between said surface 20 and the facing surface of the clamping bar lO is maintained. Now, the clamping bar 10 is loosely fixed to the two longitudinal frame members 4 and 5 of the rectangular frame 1 by means of two screws 13. As a next step, two M-8-threaded bolts 17 are in-serted into those pairs of bores lS and 15a, respectively, which are next to the ends of the workpiece l9, and each threaded bolt 17 is provided with a nut 18 which is tightened by hand such that it just rests on the lateral surface of the clamping bar 9.
2018fi95 In the region of the workpiece 19 three bores 15 are left un-occupied. In these three left bores 15 of the clamping bar 10 M-10-stud screws 22 are screwed to such an extent that their free surface rests against the irregular surface 20 o~ the workpiece 19. In this way the workpiece 19 is securely clamped between the stud screws 22 and clamping bar 9. Finally, the fastening screws 13 of the clamping bar 10 can be tightened as well.
Also in this case there is the advantage that the threaded bolts 17 are positioned very close to the ends of the workpiece l9 such that an eventually occuring elastic defor~ation of the clamping bar 9 and lO during the clamping operations will be well within very low limits.
A second embodiment of the apparatus of the invention is shown in Fig. 5. The rectangular frame of the clamping apparatus is generally designated with reference numeral 101. Again, the rectangular frame lO1 is fixed to the (not shown) worktable of a machining tool by means of suitable fixing elements (not shown). The rectangular frame lOl comprises two transverse frame members 102 and 103 as well as two longitudinal frame members 104 and 105 which together form a rigid rectangular frame structure. The two longitudinal frame members 104 and 105 are provided with threaded bores 106 equidistantly arranged in a row along the longitudinal extension of the frame members 104 and 105 and running perpendicularly to the plane of the rectan-201869~
gular frame 101.
According to the embodiment shown in Fig. 5, the rectangular frame 101 is equipped with two identically designed clamping bars 107 and 108. The particular design of these two clamping bars 107 and 108 is shown in detail in Figs. 6 to 8, whereby, as an example, the clamping bar 107 is shown in a lateral view in Fig. 6, in a bottom view in Fig. 7 and in a sectional view in Fig. 8. The clamping bar 107 is constituted by a longitudi-nal bar member made of steel and having essentially rectangular cross section. Both ends of the clamping bar 107 are provided with a flattened extension 111 having less height dimension than the clamping bar itself. The length of the clamping bar 107 without the extensions 111 corresponds to the inner width of the rectangular frame 101, measured between the inner faces of the longitudinal frame members 104 and 105. The size of the extensions 111 is such that they at least partially cover the top faces of the longitudinal frame members 104 and 105 which are provided with the threaded bores 106. The clamping bar 107 being positioned in the rectangular frame 101, the extensions 211 rest on the top surfaces of the longitudinal frame members 104 and 105.
Extensions 111 are provided with longitudinal slits 112 running transversely with respect to the clamping bar 107. The design and position of said slits 112 is such that they lay over the threaded bores 106 in the longitudinal frame members 104 and ... . .. .
20~869~
105 whell the clamping bar 107 is positioned in the rectangular frame 101. The length oE the slits 112 is somewhat greater than the distance between two adjacent threaded bores 106 such that each clamping bar 107 and 108 can be inserted into and fixed to the rectangular frame 101 at any voluntary position; thereby, the clamping bars run parallely to the transverse frame members 102 and 103. As can be further seen from Fig. 5, screws 113 are provided which penetrate the slits 112 and which are screwed into the threaded bores 106 in order to fix the clamping bars 107 and 108 in a desired position.
The clamping bar 107 is provided with a plurality of bores 115 running in the plane of the rectangular frame 101 and extending transversely to the longitudinal extension of the clamping bar 107. These bores 115 are located in the narrow plain portion of the longitudinal surface of the clamping bar 107 and are equi-distantly arranged. In addition, further bores 123 are provided which run transversely to the bores 115 in a plane perpendicu-lar to the plane of the rectangular frame 101; the bores 123 are located between two adjacent bores 115. The bores 123, the exact design thereof being evident from Fig. 8, comprise a nor-mal thread and serve to receive (not shown) clamping means.
Finally, the clamping bar 107 is provided with support protru-sions running along to adjacent edges of the clamping bar 107 which extend parallel to the plane of the rectangular frame 101.
As far as the bores 115 are concerned, the same is true as ex-plained in connection w;tll the bores lS in the clamping bar 7;
reference is made to the explanations in connection with Fig. 4 which analogously apply to the design of the bores 115.
Coming back to the embodiment ShOWTI in Pig. 5, in the ~ollow-ing, the advantage of this embodiment will be described. As an example, four hexaedral workpieces 116 shall be fixed to and clamped in the rectangular frame 101. For this purpose, the clamping bar 107 is inserted into the rectangular frame 101 in a suitable position and fixed to the two longitudinal frame members 104 and lQ5 by means of the two fixing screws 113.
Thereafter, a second clamping bar 108 is loosely inserted into the rectangular frame 101 in a certain distance to the clamping bar 107; the distance between the clamping bars 107 and 108 approximately corresponds to the relevant size of the work-pieces 116. Now, stop bars 121 having a diameter of 9mm are inserted in suitably located bores 115 of the clamping bar 107 to such an extent that they protrude somewhat into the space between the clamping bars 107 and 108.
As a next step, the workpieces 116 can be inserted into the rectangular frame 101 between the two clamping bars 107 and 108 and between the stop bars 121; thereby the workpieces 116 rest on the support protrusions with the result that the height po-sition and the mutual distance between the workpieces is fixed.
Thereafter, the clamping bar 108 is displaced towards the work-pieces 116 until there is a small clearance between the front - l9 -201869~
face of the workpiece 116 and the opposite front ~ace of the clamping bar 108. The clamping bar 108 now can be loosely fixed to the longitudinal frame members 104 and 105 of the rectangu-lar frame 101 by means of the two fixing screws 113.
Thereafter, the pairs of bores 115 in the clamping bars 107 and 108 which are next to the lateral surfaces of the workpieces 116 are equipped each with a threaded bolt 117 of M-8-size, and on each bolt 117 a nut 118 is screwed on and tightened by hand to such an extent that it just rests again the lateral face of the clamping bar 108. Now, four suitably located bores 115 of the clamping bar 108, i.e. bores llS which open to the front faces of the workpieces 116, are equipped with M-10-stud screws 122 which are tightened such that each workpiece 116 is clamped between the stud screws 122 and the clamping bar 107. Finally, also the fixing screws 113 of the clamping bar 108 can be tightened.
Also with this embodiment, the advantage can be observed that the threaded screw bolts 117 can be placed very close to the side faces of the workpieces 116 with the result that an even-tually occurring elastic deformation of the clamping bars 107 and 108 is within very low limits.
It is understood that, in a corresponding manner, a plurality of small workpieces can be clamped one next to the other one which have different width. The difference in width may easily 2018~9~
be compensated by screwlng the stud screws 122 more or less into the corresponding threaded bore 115.
The rectangular frame 1 and 101, respectively, o~ the inven-tion, finally equipped with the workpieces to be machined, is extraordinarily rigid and has comparatively low weight, due to the fact that the clamping means (threaded screw bolts 17 and 117, respectively; stud screws 22 and 122, respectively) can always be located directly besides or very close to the work-pieces to be clamped. The result is that the clamping bars can be designed relatively narrow and, therefore, light in weight.
The same is true for the transverse and longitudinal frame mem-bers of the rectangular frame 1 and 101, respectively, since they are not loaded with clamping forces at all, but only have the function to hold the clamping bars 7 to 10 and 107, 108, respectively, and thereby the workpieces 16, 19, 116, in the desired position. With other words, the real clamping function is fulfilled by an auxiliary frame, constituted by, e.g., a pair of clamping bars and two or more threaded screw bolts, said auxiliary frame being fixed by the screws 13 and 113, re-spectively, to the main frame.
The clamping apparatus of the invention is very versatile for the clamping of small or big workpieces, of a single workpiece or of several workpieces, of a plurality of different workpie-ces with irregular shape etc., because only a few basic ele-ments (clamping bars, threaded screw bolts, stud screws, stop bars) are to be used.
Further embodiments of the apparatus of the invention are cha-racterized in the claims 2 to 19.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following, two preferred embodiments of the apparatus of the invention will be further described, with reference to the accompanying drawings, in which:
Fig. 1 shows a top view of a first embodiment of the clamping apparatus of the invention with several workpieces clamped therein;
Fig. 2 shows a lateral view of a clamping bar ac-20~8~9~
cording to a first embodiment;
Fig. 3 shows a bottom view of the clamping bar oF
Fig. 2;
Fig. 4 shows a partial sectional view of the clamp-ing bar of Fig. 2, seen along the line IV-IV
in Fig. 2;
Fig. 5 shows a top view of a second embodiment of the clamping apparatus of the invention with several workpieces clamped therein;
Fig. 6 shows a lateral view of a clamping bar ac-cording to a second embodiment;
Fig. 7 shows a bottom view of the clamping bar of Fig. 6; and Fig. 8 shows a partial sectional view of the clamp-ing bar of Fig. 6, seen along the line VIII-VIII in Fig. 7.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
According to the schematic view shown in Fig. 1, a rectangular 9- 20~869~
frame is provided whicl- is generally designated with reference numeral 1. The rectangular frame 1 is fastened to the (not shown) work table of a machining tool by (not shown) Eixing means. The rectangular frame 1 comprises two transverse frame members 2 and 3 as well as two longitudinal frame members 4 and 5; the frame members 2 and 3 and the frame members 4 and 5 to-gether form a rigid rectangular frame structure. The two longi-tudinal frame members 4 and 5 are provided with threaded bores 6 equidistantly arranged in a row extending along the length of the frame members 4 and 5; said threaded bores 6 run in a di-rection perpendicular to the plane of the rectangular frame 1.
In the embodiment shown in Fig. 1, the rectangular frame 1 is provided with four identical clamping bars 7, 8, 9 and 10. The design of these clamping bars is shown in detail in Figs. 2 to 4 whereby, as an example, the clamping bar 7 is shown in a la-teral view in Fig. 2, in a bottom view in Fig. 3 and in a par-tial sectional view in Fig. 4.
The following description of the clamping bars particularly refers to the clamping bar 7. However it is understood that the following description also refers to the design of the clamping bars 8, 9 and 10.
The clamping bar 7 is constituted by a longitudinal bar member made of steel and having essentially rectangular cross section.
Both ends of the clamping bar 7 are provided with a flattened extension ll having less height dimension than the clamping bar itself. The length of the clamping bar 7 without the extensions 11 corresponds to the inner width of the rectangular frarne l, measured between the inner faces of the longitudinal frame mem-bers 4 and 5. The size of the extensions 11 is such that they at least partially cover the top faces of the longitudinal fra-me members 4 and 5 which are provided with the threaded bores 6. The clamping bar 7 being positioned in the rectangular frame 1, the extensions 11 rest on the top surfaces of the longitudi-nal frame members 4 and 5.
The extensions 11 are provided with longitudinal slits 12 running transversely with respect to the clamping bar 7. The design and position of said slits 12 is such that they lay over the threaded bores 6 in the longitudinal frame members 4 and 5 when the clamping bar 7 is positioned in the rectangular frame 1. The length of the slits 12 is somewhat greater than the distance between two adjacent threaded bores 6 such that each clamping bar 7, 8, 9 or 10 can be inserted into and fixed to the rectangular frame 1 at any voluntary position; thereby, the clamping bars run parallely to the transverse frame members 2 and 3. As can be furthér seen from Fig. 1, screws 13 are pro-vided which penetrate the slits 12 and which are screwed into the threaded bores 6 in order to fix the clamping bars 7, 8, 9 and 10 in a desired position.
One of the longitudinal head faces of the clamping bar 7 is ll- 201~69~
provided with a plurality of equidistantly positioned prismatic recesses 14. Between said recesses 14 a small p~ain portion o~
the longitudinal head face of the clamping bar 7 is provided.
Furthermore, the clamping bar 7 comprises a plurality of bores 15 running parallel to the plane of the rectangular ~rame 1 and extending transversely the the length of the clamping bar 7.
These bores 15 are located in said small plain portions of the longitudinal head face of the clamping bar 7, between the aforementioned prismatic recesses 14. Finally, additional bores 15a can be provided near to the two end portions of the clamp-ing bar 7 and close to the extensions 11.
The design of the bores 15 and 15a, respectively, can be seen from Fig. 4. Basically, the bores 15 and 15a are standard threaded bores; however, these standard threaded bores are en-larged to a predetermined nominal value n. Preferably, this nominal value n has a size which is essentially the mean value between the core bore diameter k and the nominal thread dia-meter g. In the example shown in Fig. 4, the threaded bores 15 and 15a, respectively, are provided with a metric M-10-thread, the nominal thread diameter thereof being lOmm. The core bore diameter of a M-10-thread is approximately 8.2mm. Thus, the nominal value to which the threaded bores 15 and 15a, respecti-vely, are enlarged, amounts to approximately 9mm.
Such a design allows to use the threaded bores 15 and 15a, re-spectively, for three different purposes:
20~8695 1. It is possible to screw M-10-screws or M-10-bolts into the bores 15 and 15a, respectively, whereby these screws or bolts are fixed against axial displacement.
2. It is possible to insert cylindrical bars having a dia-meter of 9mm into the bores 15 and 15a, respectively, which can be axially displaced, but which are received in said bores reliably and essentially without axial clearan-ce.
3. Screws or threaded bolts having a M-8-thread can be in-serted into the bores 15 and 15a, respectively, without being fixed against axial displacement.
Coming back to Fig. 1, the advantages of the aforementioned design will be explained further. As a first example, six cy-lindrical workpieces have to be clamped in the rectangular fra-me 1 such that their axes extend perpendicularly to the plane of the rectangular frame 1. For this purpose, the two clamping bars 7 and 8 are used in an orientation as shown in Fig. 1. The workpieces 16 align with the prismatic recesses 14 of the clamping bar 7 and, thus, are equidistantly positioned. The clamping bar 7 can be fixed to the rectangular frame 1 in any desired position by means of the screws 13. Then, the second clamping bar 8 is inserted into the rectangular frame 1, is displaced until it rests on the workpieces 16 and is slightly fixed to the longitudinal frame members 4 and 5 in such a man-2als6ss ner that it can be further displaced in the direction of the extension of the longitudinal frame members 4 and 5.
Now, all aligned pairs of threaded bores 15 of the two clamping bars 7 and 8 are provided with threaded bolts 17 and secured each with a nut 18. The nuts 18 are successively tightened in turn with the result that the clamping bar 8 which is but loo-sely fixed to the longitudinal frame members 4 and S is dis-placed towards the clamping bar 7 so as to clamp the workpieces 16 between the prismatic recesses 14 of the clamping bar 7 and the plain longitudinal head face of the clamping bar 8 directed towards the clamping bar 7. As soon as the workpieces 16 are securely clamped between the two clamping bars 7 and 8, the two fixing screws 13 of the clamping bar 8 can also be tightened.
Dùe to the fact that a threaded bolt 17 is provided directly besides each of the workpieces 16, any elastic deformation of the clamping bars 7 and 8 is avoided during the clamping there-of and all workpieces 16 are reliably clamped in the desired position.
As a second example, a hexaedral workpiece 19 shall be posi-tioned and clamped between the two clamping bars 9 and 10. One surface 20 of the hexaedral workpiece 19 is not plain and has an undefined shape. For this purpose, the clamping bar 9 is inserted into the rectangular frame 1 in a suitable position and fixed to the two longitudinal frame members 4 and 5 by - 14 - 201869~
means of the screws 13. Thereafter, the second clamping bar lO
is loosely inserted into the rectangular frame l with a certain distance to the clamping bar 9, such distance being somewhat more than the greatest size of the workpiece 19 in transverse direction. Now, two stop bars 2l having a diameter of 9mm are inserted into two aligned bore pairs 15 of the clamping bars 9 and lO in a certain distance from each other which is less than the length of the workpiece l9; in this way, each of the two stop bars 21 projects into the space between the two clamping bars 9 and 10.
In a next step, the workpiece l9 is put on the two stop bars 21 and between the two clamping bars 9 and lO; thereby, the height position and the parallel orientation with reference to the plane of the rectangular frame is fixed. Thereafter, the clamp-ing bar 10 is displaced towards the surface 20 of the workpiece 19 such that a small clearance between said surface 20 and the facing surface of the clamping bar lO is maintained. Now, the clamping bar 10 is loosely fixed to the two longitudinal frame members 4 and 5 of the rectangular frame 1 by means of two screws 13. As a next step, two M-8-threaded bolts 17 are in-serted into those pairs of bores lS and 15a, respectively, which are next to the ends of the workpiece l9, and each threaded bolt 17 is provided with a nut 18 which is tightened by hand such that it just rests on the lateral surface of the clamping bar 9.
2018fi95 In the region of the workpiece 19 three bores 15 are left un-occupied. In these three left bores 15 of the clamping bar 10 M-10-stud screws 22 are screwed to such an extent that their free surface rests against the irregular surface 20 o~ the workpiece 19. In this way the workpiece 19 is securely clamped between the stud screws 22 and clamping bar 9. Finally, the fastening screws 13 of the clamping bar 10 can be tightened as well.
Also in this case there is the advantage that the threaded bolts 17 are positioned very close to the ends of the workpiece l9 such that an eventually occuring elastic defor~ation of the clamping bar 9 and lO during the clamping operations will be well within very low limits.
A second embodiment of the apparatus of the invention is shown in Fig. 5. The rectangular frame of the clamping apparatus is generally designated with reference numeral 101. Again, the rectangular frame lO1 is fixed to the (not shown) worktable of a machining tool by means of suitable fixing elements (not shown). The rectangular frame lOl comprises two transverse frame members 102 and 103 as well as two longitudinal frame members 104 and 105 which together form a rigid rectangular frame structure. The two longitudinal frame members 104 and 105 are provided with threaded bores 106 equidistantly arranged in a row along the longitudinal extension of the frame members 104 and 105 and running perpendicularly to the plane of the rectan-201869~
gular frame 101.
According to the embodiment shown in Fig. 5, the rectangular frame 101 is equipped with two identically designed clamping bars 107 and 108. The particular design of these two clamping bars 107 and 108 is shown in detail in Figs. 6 to 8, whereby, as an example, the clamping bar 107 is shown in a lateral view in Fig. 6, in a bottom view in Fig. 7 and in a sectional view in Fig. 8. The clamping bar 107 is constituted by a longitudi-nal bar member made of steel and having essentially rectangular cross section. Both ends of the clamping bar 107 are provided with a flattened extension 111 having less height dimension than the clamping bar itself. The length of the clamping bar 107 without the extensions 111 corresponds to the inner width of the rectangular frame 101, measured between the inner faces of the longitudinal frame members 104 and 105. The size of the extensions 111 is such that they at least partially cover the top faces of the longitudinal frame members 104 and 105 which are provided with the threaded bores 106. The clamping bar 107 being positioned in the rectangular frame 101, the extensions 211 rest on the top surfaces of the longitudinal frame members 104 and 105.
Extensions 111 are provided with longitudinal slits 112 running transversely with respect to the clamping bar 107. The design and position of said slits 112 is such that they lay over the threaded bores 106 in the longitudinal frame members 104 and ... . .. .
20~869~
105 whell the clamping bar 107 is positioned in the rectangular frame 101. The length oE the slits 112 is somewhat greater than the distance between two adjacent threaded bores 106 such that each clamping bar 107 and 108 can be inserted into and fixed to the rectangular frame 101 at any voluntary position; thereby, the clamping bars run parallely to the transverse frame members 102 and 103. As can be further seen from Fig. 5, screws 113 are provided which penetrate the slits 112 and which are screwed into the threaded bores 106 in order to fix the clamping bars 107 and 108 in a desired position.
The clamping bar 107 is provided with a plurality of bores 115 running in the plane of the rectangular frame 101 and extending transversely to the longitudinal extension of the clamping bar 107. These bores 115 are located in the narrow plain portion of the longitudinal surface of the clamping bar 107 and are equi-distantly arranged. In addition, further bores 123 are provided which run transversely to the bores 115 in a plane perpendicu-lar to the plane of the rectangular frame 101; the bores 123 are located between two adjacent bores 115. The bores 123, the exact design thereof being evident from Fig. 8, comprise a nor-mal thread and serve to receive (not shown) clamping means.
Finally, the clamping bar 107 is provided with support protru-sions running along to adjacent edges of the clamping bar 107 which extend parallel to the plane of the rectangular frame 101.
As far as the bores 115 are concerned, the same is true as ex-plained in connection w;tll the bores lS in the clamping bar 7;
reference is made to the explanations in connection with Fig. 4 which analogously apply to the design of the bores 115.
Coming back to the embodiment ShOWTI in Pig. 5, in the ~ollow-ing, the advantage of this embodiment will be described. As an example, four hexaedral workpieces 116 shall be fixed to and clamped in the rectangular frame 101. For this purpose, the clamping bar 107 is inserted into the rectangular frame 101 in a suitable position and fixed to the two longitudinal frame members 104 and lQ5 by means of the two fixing screws 113.
Thereafter, a second clamping bar 108 is loosely inserted into the rectangular frame 101 in a certain distance to the clamping bar 107; the distance between the clamping bars 107 and 108 approximately corresponds to the relevant size of the work-pieces 116. Now, stop bars 121 having a diameter of 9mm are inserted in suitably located bores 115 of the clamping bar 107 to such an extent that they protrude somewhat into the space between the clamping bars 107 and 108.
As a next step, the workpieces 116 can be inserted into the rectangular frame 101 between the two clamping bars 107 and 108 and between the stop bars 121; thereby the workpieces 116 rest on the support protrusions with the result that the height po-sition and the mutual distance between the workpieces is fixed.
Thereafter, the clamping bar 108 is displaced towards the work-pieces 116 until there is a small clearance between the front - l9 -201869~
face of the workpiece 116 and the opposite front ~ace of the clamping bar 108. The clamping bar 108 now can be loosely fixed to the longitudinal frame members 104 and 105 of the rectangu-lar frame 101 by means of the two fixing screws 113.
Thereafter, the pairs of bores 115 in the clamping bars 107 and 108 which are next to the lateral surfaces of the workpieces 116 are equipped each with a threaded bolt 117 of M-8-size, and on each bolt 117 a nut 118 is screwed on and tightened by hand to such an extent that it just rests again the lateral face of the clamping bar 108. Now, four suitably located bores 115 of the clamping bar 108, i.e. bores llS which open to the front faces of the workpieces 116, are equipped with M-10-stud screws 122 which are tightened such that each workpiece 116 is clamped between the stud screws 122 and the clamping bar 107. Finally, also the fixing screws 113 of the clamping bar 108 can be tightened.
Also with this embodiment, the advantage can be observed that the threaded screw bolts 117 can be placed very close to the side faces of the workpieces 116 with the result that an even-tually occurring elastic deformation of the clamping bars 107 and 108 is within very low limits.
It is understood that, in a corresponding manner, a plurality of small workpieces can be clamped one next to the other one which have different width. The difference in width may easily 2018~9~
be compensated by screwlng the stud screws 122 more or less into the corresponding threaded bore 115.
The rectangular frame 1 and 101, respectively, o~ the inven-tion, finally equipped with the workpieces to be machined, is extraordinarily rigid and has comparatively low weight, due to the fact that the clamping means (threaded screw bolts 17 and 117, respectively; stud screws 22 and 122, respectively) can always be located directly besides or very close to the work-pieces to be clamped. The result is that the clamping bars can be designed relatively narrow and, therefore, light in weight.
The same is true for the transverse and longitudinal frame mem-bers of the rectangular frame 1 and 101, respectively, since they are not loaded with clamping forces at all, but only have the function to hold the clamping bars 7 to 10 and 107, 108, respectively, and thereby the workpieces 16, 19, 116, in the desired position. With other words, the real clamping function is fulfilled by an auxiliary frame, constituted by, e.g., a pair of clamping bars and two or more threaded screw bolts, said auxiliary frame being fixed by the screws 13 and 113, re-spectively, to the main frame.
The clamping apparatus of the invention is very versatile for the clamping of small or big workpieces, of a single workpiece or of several workpieces, of a plurality of different workpie-ces with irregular shape etc., because only a few basic ele-ments (clamping bars, threaded screw bolts, stud screws, stop bars) are to be used.
Claims (19)
1. An apparatus for clamping a workpiece to be machined by a machine tool, said apparatus comprising:
rectangular frame means including two longitudinal frame members and two transverse frame members;
clamping means for fixing said workpiece to be machined to said rectangular frame means, said clamping means comprising at least one auxiliary frame means which is removably inserted in said rectangular frame means;
each of said auxiliary frame means including two clamping bars which are adjustable relative to each other in the longitudinal direction of said longitudinal frame members to enable clamping of said workpiece therebetween, said clamping bars defining a plurality of first bores for selectively receiving clamping screw means, said first bores running essentially parallel to said longitudinal frame members when said clamping bars are connected to said longitudinal frame members, each clamping bar having one end releasably connected to one of said longitudinal frame members and an opposite end releasably connected to the other one of said longitudinal frame members;
means for connecting said ends of each clamping bar to said longitudinal frame members; and clamping screw means for, when selectively received in said first bores, providing a clamping force to clamp said workpiece between said clamping bars and to thereby fix said workpiece to said rectangular frame means when said clamping bars are adjusted relative to each other to enable clamping of said workpiece and are connected to said longitudinal frame members.
rectangular frame means including two longitudinal frame members and two transverse frame members;
clamping means for fixing said workpiece to be machined to said rectangular frame means, said clamping means comprising at least one auxiliary frame means which is removably inserted in said rectangular frame means;
each of said auxiliary frame means including two clamping bars which are adjustable relative to each other in the longitudinal direction of said longitudinal frame members to enable clamping of said workpiece therebetween, said clamping bars defining a plurality of first bores for selectively receiving clamping screw means, said first bores running essentially parallel to said longitudinal frame members when said clamping bars are connected to said longitudinal frame members, each clamping bar having one end releasably connected to one of said longitudinal frame members and an opposite end releasably connected to the other one of said longitudinal frame members;
means for connecting said ends of each clamping bar to said longitudinal frame members; and clamping screw means for, when selectively received in said first bores, providing a clamping force to clamp said workpiece between said clamping bars and to thereby fix said workpiece to said rectangular frame means when said clamping bars are adjusted relative to each other to enable clamping of said workpiece and are connected to said longitudinal frame members.
2. An apparatus for clamping a workpiece to be machined by a - Page 1 of Claims -machine tool, said apparatus comprising:
rectangular frame means including two longitudinal frame members and two transverse frame members, said longitudinal frame members of said rectangular frame means being provided with a plurality of threaded bores equidistantly arranged in a row and running in a direction which is perpendicular to the plane of said rectangular frame means;
clamping means for fixing said workpiece to be machined to said rectangular frame means, said clamping means comprising at least one auxiliary frame means which is removably inserted in said rectangular frame means;
each of said auxiliary frame means including two clamping bars which are adjustable relative to each other in the longitudinal direction of said longitudinal frame members to enable clamping of said workpiece therebetween, said clamping bars defining a plurality of first bores for selectively receiving clamping screw means, said first bores running essentially parallel to said longitudinal frame members when said clamping bars are connected to said longitudinal frame members, each clamping bar having one end releasably connected to one of said longitudinal frame members and an opposite end releasably connected to the other one of said longitudinal frame members;
means for cooperating with said plurality of threaded bores of said longitudinal frame members for connecting said ends of each clamping bar to said longitudinal frame members; and clamping screw means for, when selectively received in said first bores, providing a clamping force to clamp said workpiece between said clamping bars and to thereby fix said workpiece to said rectangular frame means when said clamping bars are adjusted relative to each other to enable clamping of said workpiece and are connected to said longitudinal frame members.
- Page 2 of Claims -
rectangular frame means including two longitudinal frame members and two transverse frame members, said longitudinal frame members of said rectangular frame means being provided with a plurality of threaded bores equidistantly arranged in a row and running in a direction which is perpendicular to the plane of said rectangular frame means;
clamping means for fixing said workpiece to be machined to said rectangular frame means, said clamping means comprising at least one auxiliary frame means which is removably inserted in said rectangular frame means;
each of said auxiliary frame means including two clamping bars which are adjustable relative to each other in the longitudinal direction of said longitudinal frame members to enable clamping of said workpiece therebetween, said clamping bars defining a plurality of first bores for selectively receiving clamping screw means, said first bores running essentially parallel to said longitudinal frame members when said clamping bars are connected to said longitudinal frame members, each clamping bar having one end releasably connected to one of said longitudinal frame members and an opposite end releasably connected to the other one of said longitudinal frame members;
means for cooperating with said plurality of threaded bores of said longitudinal frame members for connecting said ends of each clamping bar to said longitudinal frame members; and clamping screw means for, when selectively received in said first bores, providing a clamping force to clamp said workpiece between said clamping bars and to thereby fix said workpiece to said rectangular frame means when said clamping bars are adjusted relative to each other to enable clamping of said workpiece and are connected to said longitudinal frame members.
- Page 2 of Claims -
3. An apparatus according to claim 2, in which said clamping bars comprise flattened end portions which are adapted to rest on said longitudinal frame members equipped with said threaded bores, each of said flattened end portions comprising a slot extending in the direction of said longitudinal frame members equipped with said threaded bores and said slots coinciding with said threaded bores provided in said longitudinal frame members.
4. An apparatus according to claim 1, in which each of said clamping bars has a longitudinal head face which is provided with a plurality of prismatic-shaped recesses.
5. An apparatus according to claim 4, in which some of said first bores provided in said clamping bars are located between adjacent prismatic-shaped recesses.
6. An apparatus for clamping a workpiece to be machined by a machine tool, said apparatus comprising:
rectangular frame means including two longitudinal frame members and two transverse frame members;
clamping means for fixing said workpiece to be machined to said rectangular frame means, said clamping means comprising at least one auxiliary frame means which is removably inserted in said rectangular frame means;
each of said auxiliary frame means including two clamping bars which are adjustable relative to each other in the longitudinal direction of said longitudinal frame members to enable clamping of said workpiece therebetween, said clamping bars defining a plurality of first bores for selectively receiving clamping screw means, said first bores running essentially parallel to said longitudinal frame members when said clamping bars are connected to said longitudinal frame members, each clamping bar having one end releasably connected to one of - Page 3 of Claims -said longitudinal frame members and an opposite end releasably connected to the other one of said longitudinal frame members;
means for connecting said ends of each clamping bar to said longitudinal frame members; and clamping screw means for, when selectively received in said first bores, providing a clamping force to clamp said workpiece between said clamping bars and to thereby fix said workpiece to said rectangular frame means when said clamping bars are adjusted relative to each other to enable clamping of said workpiece and are connected to said longitudinal frame members;
said clamping bars being provided with a plurality of equidistantly arranged threaded second bores extending perpendicularly to the plane of said rectangular frame means.
rectangular frame means including two longitudinal frame members and two transverse frame members;
clamping means for fixing said workpiece to be machined to said rectangular frame means, said clamping means comprising at least one auxiliary frame means which is removably inserted in said rectangular frame means;
each of said auxiliary frame means including two clamping bars which are adjustable relative to each other in the longitudinal direction of said longitudinal frame members to enable clamping of said workpiece therebetween, said clamping bars defining a plurality of first bores for selectively receiving clamping screw means, said first bores running essentially parallel to said longitudinal frame members when said clamping bars are connected to said longitudinal frame members, each clamping bar having one end releasably connected to one of - Page 3 of Claims -said longitudinal frame members and an opposite end releasably connected to the other one of said longitudinal frame members;
means for connecting said ends of each clamping bar to said longitudinal frame members; and clamping screw means for, when selectively received in said first bores, providing a clamping force to clamp said workpiece between said clamping bars and to thereby fix said workpiece to said rectangular frame means when said clamping bars are adjusted relative to each other to enable clamping of said workpiece and are connected to said longitudinal frame members;
said clamping bars being provided with a plurality of equidistantly arranged threaded second bores extending perpendicularly to the plane of said rectangular frame means.
7. An apparatus for clamping a workpiece to be machined by a machine tool, said apparatus comprising:
rectangular frame means including two longitudinal frame members and two transverse frame members;
clamping means for fixing said workpiece to be machined to said rectangular frame means, said clamping means comprising at least one auxiliary frame means which is removably inserted in said rectangular frame means;
each of said auxiliary frame means including two clamping bars which are adjustable relative to each other in the longitudinal direction of said longitudinal frame members to enable clamping of said workpiece therebetween, said clamping bars defining a plurality of first bores for selectively receiving clamping screw means, said first bores running essentially parallel to said longitudinal frame members when said clamping bars are connected to said longitudinal frame members, - Page 4 of Claims -each clamping bar having one end releasably connected to one of said longitudinal frame members and an opposite end releasably connected to the other one of said longitudinal frame members;
means for connecting said ends of each clamping bar to said longitudinal frame members; and clamping screw means for, when selectively received in said first bores, providing a clamping force to clamp said workpiece between said clamping bars and to thereby fix said workpiece to said rectangular frame means when said clamping bars are adjusted relative to each other to enable clamping of said workpiece and are connected to said longitudinal frame members;
each of said clamping bars being provided with support protrusions running along two adjacent edges of the clamping bar, each of said edges extending parallel to the plane of said rectangular frame means.
rectangular frame means including two longitudinal frame members and two transverse frame members;
clamping means for fixing said workpiece to be machined to said rectangular frame means, said clamping means comprising at least one auxiliary frame means which is removably inserted in said rectangular frame means;
each of said auxiliary frame means including two clamping bars which are adjustable relative to each other in the longitudinal direction of said longitudinal frame members to enable clamping of said workpiece therebetween, said clamping bars defining a plurality of first bores for selectively receiving clamping screw means, said first bores running essentially parallel to said longitudinal frame members when said clamping bars are connected to said longitudinal frame members, - Page 4 of Claims -each clamping bar having one end releasably connected to one of said longitudinal frame members and an opposite end releasably connected to the other one of said longitudinal frame members;
means for connecting said ends of each clamping bar to said longitudinal frame members; and clamping screw means for, when selectively received in said first bores, providing a clamping force to clamp said workpiece between said clamping bars and to thereby fix said workpiece to said rectangular frame means when said clamping bars are adjusted relative to each other to enable clamping of said workpiece and are connected to said longitudinal frame members;
each of said clamping bars being provided with support protrusions running along two adjacent edges of the clamping bar, each of said edges extending parallel to the plane of said rectangular frame means.
8. An apparatus for clamping workpiece to be machined by a machine tool, said apparatus comprising:
rectangular frame means including two longitudinal frame members and two transverse frame members;
clamping means for fixing said workpiece to be machined to said rectangular frame means, said clamping means comprising at least one auxiliary frame means which is removably inserted in said rectangular frame means;
each of said auxiliary frame means including two clamping bars which are adjustable relative to each other in the longitudinal direction of said longitudinal frame members to enable clamping of said workpiece therebetween, said clamping bars comprising a plurality of continuous threaded first bores running essentially perpendicular to said clamping bars, said first bores being enlarged to a predetermined nominal diameter and said first bores being adapted to selectively receive clamping screw means, each clamping bar having one end releasably connected to one of said longitudinal frame members and an opposite end releasably connected to the other one of said longitudinal frame members;
means for connecting said ends of each clamping bar to said longitudinal frame members; and clamping screw means for, when selectively received in said first bores, providing a clamping force to clamp said workpiece between said clamping bars and to thereby fix said workpiece to said rectangular frame means when said clamping bars are adjusted relative to each other to enable clamping of said workpiece and are connected to said longitudinal frame members.
rectangular frame means including two longitudinal frame members and two transverse frame members;
clamping means for fixing said workpiece to be machined to said rectangular frame means, said clamping means comprising at least one auxiliary frame means which is removably inserted in said rectangular frame means;
each of said auxiliary frame means including two clamping bars which are adjustable relative to each other in the longitudinal direction of said longitudinal frame members to enable clamping of said workpiece therebetween, said clamping bars comprising a plurality of continuous threaded first bores running essentially perpendicular to said clamping bars, said first bores being enlarged to a predetermined nominal diameter and said first bores being adapted to selectively receive clamping screw means, each clamping bar having one end releasably connected to one of said longitudinal frame members and an opposite end releasably connected to the other one of said longitudinal frame members;
means for connecting said ends of each clamping bar to said longitudinal frame members; and clamping screw means for, when selectively received in said first bores, providing a clamping force to clamp said workpiece between said clamping bars and to thereby fix said workpiece to said rectangular frame means when said clamping bars are adjusted relative to each other to enable clamping of said workpiece and are connected to said longitudinal frame members.
9. An apparatus according to claim 8, in which said longitudinal frame members of said rectangular frame means are provided with a plurality of threaded bores equidistantly arranged in a row and running in a direction which is perpendicular to the plane of said rectangular frame means.
10. An apparatus according to claim 9, in which said clamping bars comprise flattened end portions which are adapted to rest on said longitudinal frame members equipped with said threaded bores, each of said flattened end portions comprising a slot extending in the direction of said longitudinal frame members equipped with said threaded bores and said slots coinciding with said threaded bores provided in said longitudinal frame members.
11. An apparatus according to claim 8, in which said threaded first bores in said clamping bars are enlarged to a diameter, the size of which essentially corresponds to the mean value of the nominal diameter of the thread and the core bore diameter of the thread.
12. An apparatus according to claim 8, in which each of said clamping bars has a longitudinal head face which is provided with a plurality of prismatic-shaped recesses.
13. An apparatus according to claim 12, in which some of said threaded first bores provided in said clamping bars are located between adjacent prismatic-shaped recesses.
14. An apparatus according to claim 8, in which said clamping bars are provided with a plurality of equidistantly arranged threaded second bores extending perpendicularly to the plane of said rectangular frame means.
15. An apparatus according to claim 8, in which each of said clamping bars is provided with support protrusions running along two adjacent edges of the clamping bar, each of said edges extending parallel to the plane of said rectangular frame means.
16. An apparatus according to claim 8, in which two parallel running clamping bars are located near each other, some of said threaded first bores of said clamping bars being provided with a stud screw adapted to clamp a workpiece between said two parallely running clamping bars.
17. An apparatus according to claim 8, in which some of said threaded first bores are provided with stop bars projecting out of said threaded first bores.
18. An apparatus according to claim 16, in which there are provided continuous threaded bolts running through predetermined aligned pairs of threaded first bores of said two clamping bars.
19. An apparatus according to claim 8, in which said threaded first bores are enlarged to a predetermined nominal diameter.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3919078A DE3919078C1 (en) | 1989-06-10 | 1989-06-10 | |
| DEP3919078.1 | 1989-06-10 | ||
| SG136693A SG136693G (en) | 1989-06-10 | 1993-12-21 | Clamping device for workpieces destined to be processed on a machine-tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2018695A1 CA2018695A1 (en) | 1990-12-10 |
| CA2018695C true CA2018695C (en) | 1998-06-30 |
Family
ID=25881838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002018695A Expired - Fee Related CA2018695C (en) | 1989-06-10 | 1990-06-11 | Apparatus for clamping workpieces which have to be machined by a machine tool |
Country Status (14)
| Country | Link |
|---|---|
| EP (2) | EP0403427B1 (en) |
| JP (1) | JPH0755421B2 (en) |
| KR (1) | KR0147055B1 (en) |
| CN (1) | CN1022814C (en) |
| AT (2) | ATE141198T1 (en) |
| AU (1) | AU626142B2 (en) |
| CA (1) | CA2018695C (en) |
| DE (3) | DE3919078C1 (en) |
| DK (2) | DK0557248T3 (en) |
| ES (2) | ES2044524T3 (en) |
| FI (1) | FI93177C (en) |
| GR (1) | GR3021599T3 (en) |
| HK (2) | HK140693A (en) |
| SG (1) | SG136693G (en) |
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| DE19744624A1 (en) * | 1997-10-09 | 1999-04-15 | Joerg R Bauer | Work-station for work-holding frame-guided drive bar |
| DE29805000U1 (en) * | 1998-03-19 | 1999-07-29 | KUKA Schweissanlagen GmbH, 86165 Augsburg | Clamping device |
| CN1215636C (en) | 2001-12-31 | 2005-08-17 | 艾默生网络能源有限公司 | Method of establishing host machine in multi-module parallel system |
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| CH467647A (en) * | 1967-01-13 | 1969-01-31 | Ch George Andre | Device for clamping workpieces |
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| JPS639381U (en) * | 1986-07-02 | 1988-01-21 | ||
| JPS6327230U (en) * | 1986-08-03 | 1988-02-23 | ||
| FR2620363B1 (en) * | 1987-09-15 | 1994-08-12 | Carossino Freres | WORKPIECE CLAMPING ASSEMBLY |
-
1989
- 1989-06-10 DE DE3919078A patent/DE3919078C1/de not_active Expired - Lifetime
-
1990
- 1990-06-01 ES ES90810401T patent/ES2044524T3/en not_active Expired - Lifetime
- 1990-06-01 DK DK93810094.8T patent/DK0557248T3/en active
- 1990-06-01 EP EP90810401A patent/EP0403427B1/en not_active Expired - Lifetime
- 1990-06-01 AT AT93810094T patent/ATE141198T1/en not_active IP Right Cessation
- 1990-06-01 AT AT90810401T patent/ATE94794T1/en not_active IP Right Cessation
- 1990-06-01 DE DE90810401T patent/DE59002801D1/en not_active Expired - Fee Related
- 1990-06-01 EP EP93810094A patent/EP0557248B1/en not_active Expired - Lifetime
- 1990-06-01 ES ES93810094T patent/ES2093390T3/en not_active Expired - Lifetime
- 1990-06-01 DK DK90810401.1T patent/DK0403427T3/en active
- 1990-06-01 DE DE59010458T patent/DE59010458D1/en not_active Expired - Fee Related
- 1990-06-06 AU AU56878/90A patent/AU626142B2/en not_active Ceased
- 1990-06-08 JP JP2151429A patent/JPH0755421B2/en not_active Expired - Lifetime
- 1990-06-09 KR KR1019900008462A patent/KR0147055B1/en not_active Expired - Lifetime
- 1990-06-09 CN CN90104913A patent/CN1022814C/en not_active Expired - Lifetime
- 1990-06-11 CA CA002018695A patent/CA2018695C/en not_active Expired - Fee Related
- 1990-06-11 FI FI902913A patent/FI93177C/en not_active IP Right Cessation
-
1993
- 1993-12-21 SG SG136693A patent/SG136693G/en unknown
- 1993-12-23 HK HK1406/93A patent/HK140693A/en not_active IP Right Cessation
-
1996
- 1996-11-13 GR GR960402977T patent/GR3021599T3/en unknown
-
1997
- 1997-06-19 HK HK82997A patent/HK82997A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0326437A (en) | 1991-02-05 |
| EP0557248A1 (en) | 1993-08-25 |
| KR910005967A (en) | 1991-04-27 |
| EP0403427A3 (en) | 1991-04-24 |
| CN1048344A (en) | 1991-01-09 |
| HK82997A (en) | 1997-06-27 |
| CN1022814C (en) | 1993-11-24 |
| ATE94794T1 (en) | 1993-10-15 |
| GR3021599T3 (en) | 1997-02-28 |
| DK0403427T3 (en) | 1993-12-06 |
| FI93177C (en) | 1995-03-10 |
| DE59002801D1 (en) | 1993-10-28 |
| FI902913A0 (en) | 1990-06-11 |
| ES2044524T3 (en) | 1994-01-01 |
| AU626142B2 (en) | 1992-07-23 |
| HK140693A (en) | 1993-12-31 |
| DE59010458D1 (en) | 1996-09-19 |
| DK0557248T3 (en) | 1997-01-13 |
| KR0147055B1 (en) | 1998-11-02 |
| DE3919078C1 (en) | 1990-02-01 |
| EP0403427B1 (en) | 1993-09-22 |
| EP0557248B1 (en) | 1996-08-14 |
| AU5687890A (en) | 1990-12-13 |
| SG136693G (en) | 1994-03-31 |
| JPH0755421B2 (en) | 1995-06-14 |
| ATE141198T1 (en) | 1996-08-15 |
| FI93177B (en) | 1994-11-30 |
| ES2093390T3 (en) | 1996-12-16 |
| CA2018695A1 (en) | 1990-12-10 |
| EP0403427A2 (en) | 1990-12-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |