JP2011038590A - Connecting structure of frame - Google Patents

Abstract

The present invention provides a frame connection structure in which frames can be easily connected by a simple operation and can be firmly assembled.
A frame connecting structure for connecting columnar frames (10) through a joint (20). The frame (10) has a substantially square shape as a whole, and a circular pin insertion hole (11) is provided at the center. A screw hole 13 is formed at a predetermined corner, and the joint 20 has a substantially cubic body 21 as a whole, and at least three pins protruding from the center of a predetermined surface of the main body 21 and inserted into the pin insertion hole 11. 23, and a screw insertion hole 25 formed by penetrating both surfaces at a predetermined corner portion of the pin projecting surface and the opposing surface of the main body 21, and inserting the pin 23 into the pin insertion hole 11 to insert the screw By screwing the bolt 5 inserted through the hole 25 into the screw hole 13, the frame 10 and the joint 20 are connected.
[Selection] Figure 1

Description

  The present invention relates to a frame connection structure suitable for forming, for example, a mounting base on which various devices such as an electrical / electronic component assembling device and a measuring device are mounted.

  Previously, columnar frames made of metal, resin, etc., were appropriately connected through joints to form a predetermined shape, which could be used as a platform for mounting various devices such as electrical / electronic component assembly devices and measurement devices. It is widely used as a housing for housing them, or as a frame for various interiors such as shelves, desks, and chairs.

  For example, in Patent Document 1 below, a plurality of joint units each projecting a short columnar joint on each of three adjacent surfaces of a cube-shaped corner block, and a cylindrical shape having an arbitrary length, There is disclosed an assembly-type pedestal composed of a combination of a plurality of cylindrical girders and cylindrical columnar materials (hereinafter referred to as “cylindrical materials”) capable of tightly fitting an end portion to the joint. In the embodiment, the joint has a rectangular tube shape, and a plurality of screw holes are formed on the outer surface thereof, and the corresponding cylindrical material also has a rectangular tube shape, and a bolt hole is formed on the outer surface thereof. And by inserting each square tube-shaped joint into the end of the rectangular tube-shaped tube material so that the bolt hole aligns with the screw hole of the joint, and screwing the bolt into the screw hole through the bolt hole, A tubular member is fixed to each joint.

  Further, in Patent Document 2 below, a connecting block member having a joint member having a tapered portion gradually becoming smaller in diameter toward a screw shaft provided in a base portion and a plurality of screw holes into which the screw shaft of the joint member is screwed. And a frame having at least one end formed in a hollow shape, and a screwed portion from the side near the end forming the hollow portion of the frame, pressing the tapered portion of the joint member inserted into the hollow portion of the frame, There is disclosed a frame forming apparatus including a fixing screw for fixing a frame to a block member. When assembling, first, a screw shaft is screwed into the screw hole of the block member, a plurality of joint members are fixed to each surface of the block member, and these joint members are inserted into the hollow portions of the respective frames. Thereafter, a fixing screw is screwed in from the side of the end of each frame, and the frame is fixed to the plurality of joint members by pressing the tip of the screw against the tapered portion of the joint member. A plurality of frames are fixed.

JP-A-9-168444 JP 59-125514 A

  By the way, after the frames are connected and used as a gantry for various devices, the assembled frame may be disassembled or resized for reasons such as device repair or modification. However, in the structure used to connect the frames by pressing the prismatic boss of the block into the hole of the columnar frame, the boss is press-fitted into the hole of the frame. In some cases, it is difficult to remove the frame from the frame and the above-described frame disassembling work cannot be easily performed.

  Further, in the case of the assembly type pedestal described in Patent Document 1, each joint of the corner block is inserted into the tubular member, and the joint is screwed and fixed to the tubular member, and the joint is positioned with respect to the tubular member. And also serves as a fixed. However, if the dimensional accuracy of the screw holes of the joint and the bolt holes of the cylinder material is poor, the end of the cylinder material may not come into contact with the peripheral edge of the joint of the corner block and may float, resulting in a gap between the two members. In some cases, a problem arises in the connection strength of the frames. Further, since each joint and the cylindrical material are both in the shape of a rectangular tube, the screw holes and the bolt holes must be aligned before inserting the joint, and the connecting operation is troublesome.

  On the other hand, in the frame body forming apparatus of Patent Document 2, the frame is fixed to the joint member by pressing the distal end portion of the fixing screw to the tapered portion of the joint member inserted into the frame hollow portion. ing. However, since the taper portion is gradually reduced in diameter toward the screw shaft, a gap is formed between the outer periphery of the taper portion and the inner periphery of the frame hollow portion, and as a result, the frame is loose with respect to the joint member. In some cases, it could not be firmly attached.

  In addition, the joint member has a columnar shape as a whole, so that it can be rotated in the hollow part of the frame. When the fixing screw is pressed against the tapered part of the joint member, the frame is prevented from rotating around the joint member. It is fixed. In this case, since the tip of the fixing screw is only pressed against the taper portion, the crimping force against the taper portion of the fixing screw tends to be insufficient, and if a strong rotational force acts on the frame, the frame will turn. Thus, the frame may be displaced with respect to the block member.

  Accordingly, an object of the present invention is to provide a frame connection structure that allows frames to be easily connected by a simple operation and can be firmly assembled.

In order to achieve the above object, the first frame connection structure of the present invention is a frame connection structure in which columnar frames are connected to each other through a joint,
The frame has a substantially square shape as a whole, a circular pin insertion hole is provided at the center, and a screw hole is formed at a predetermined corner,
The joint as a whole has a substantially cubic shape, at least three pins protruding from the center of a predetermined surface of the main body in a columnar shape or a cylindrical shape, and inserted into a pin insertion hole of the frame, A screw insertion hole formed so as to penetrate both sides of the pin projecting surface of the main body and a predetermined corner portion of the opposing surface thereof,
The frame and the joint are connected by inserting the pin of the joint into the pin insertion hole of the frame and screwing the screw inserted through the screw insertion hole of the joint into the screw hole of the frame. A frame connection structure is provided.

  According to the first connecting structure, the frames can be temporarily assembled by simply inserting the joint pins into the pin insertion holes on the end face of the frame, and in this state, the screws are inserted through the screw insertion holes of the joint. By screwing this screw into the screw hole of the frame, the frame can be connected and fixed to the joint, so that the assembly work of the frame becomes easy.

  Further, when the frame assembly assembled by this connection structure is applied to a frame or a casing of various apparatuses, it may be necessary to disassemble or change the size for reasons of repair or modification. In this case, you can loosen the screw inserted into the screw insertion hole of the joint and pull it out and pull out the joint pin from the pin insertion hole of the frame. Can be easily disassembled and resized.

  Further, the frame is positioned and fixed by the pin and screw in a state where the end surface of the frame is in contact with a predetermined surface of the joint. In addition, the end face of the frame is in close contact with the joint, so that the strength and accuracy of the assembled frame assembly can be increased, and it can be used as a frame or a frame for various manufacturing apparatuses and analysis apparatuses.

  In addition, the joint is located at a corner portion where the frames are connected to each other, the pins and the like are not visible from the outside, and there is no particular thing that protrudes to the outside, so that the appearance is improved.

  In the present invention, the frame has the screw holes formed at the four corners of the end surface, and the first dovetail groove along the longitudinal direction is formed at the center of at least one side surface of the frame. It is preferable to make a shape. According to this, since the screw holes are formed at the four corners, the screws inserted from the joint can be screwed at any corner, and provided at the center of at least one side surface. In addition, the first dovetail groove can be used to attach a connection aid or a bracket and reduce the weight of the frame.

  In the present invention, at least one side surface of the frame where the first dovetail groove is formed has a smaller width than the first dovetail groove in a portion extending from a corner of the frame to the first dovetail groove. It is preferable that the second dovetail groove is formed along the longitudinal direction. According to this, it is possible to further reduce the weight of the frame, and it is easy to fix a relatively small bracket for attaching various devices attached to the frame.

The connection structure of the second frame of the present invention is a connection structure of frames that connects columnar frames through a joint and a connection aid,
The frame has a shape in which an end surface thereof is substantially square as a whole, a circular pin insertion hole is provided at the center, and a first dovetail groove is formed on at least one side surface,
The joint includes a main body having a substantially cubic shape as a whole, and at least three pins that protrude from the center of a predetermined surface of the main body in a columnar shape or a cylindrical shape and are inserted into the pin insertion holes of the frame. And
The connection aid is substantially L-shaped, and both ends thereof have a dovetail shape that fits the first dovetail groove, and both ends are provided with means for fixing to the frame,
The joint pin is inserted into the pin insertion hole of the frame, and both ends of the connection aid are inserted into the first dovetail of the corresponding frame, and both ends of the connection aid are accommodated by the fixing means. The frame and the joint are connected to each other by being fixed to the frame to be provided.

  According to the above invention, for example, when the frame is connected to the five surfaces of the joint, the frame is arranged on the opposing surfaces of the joint and the screw insertion hole is hidden, but the connection aid By using, crossing frames can be connected. Further, the frames can be disassembled by removing the fixing means of the connection aid.

  A third frame connection structure according to the present invention includes the first connection structure and the second connection structure. According to the connection structure of the third frame, there is a pin on the opposing surface of the joint, and a part that cannot be screwed is used to connect the frames together by using a connection aid. Can be linked.

  In the present invention, it is preferable that a screw hole for attaching a leg member is provided at the center of one surface of the joint. According to this, a leg member such as a caster or an adjuster is attached to the joint by screwing a support shaft of a caster into a screw hole of the joint or by screwing a support shaft of an adjuster for height adjustment. be able to. When the caster is attached to the joint, the frame assembly can be easily moved. When the adjuster is attached to the joint, the frame assembly can be adjusted to a predetermined height.

  In the present invention, the joint has pins on three surfaces adjacent to each other centering on one corner, and pins on three surfaces, one opposing surface and one surface orthogonal to those surfaces. It is preferable to have a combination of one having four surfaces, one opposing surface and two surfaces orthogonal to each other and orthogonal to each other, and having a pin on five surfaces. According to this, it becomes possible to constitute frame assemblies of various shapes by combining the above four joints.

  In the present invention, the frame and the joint are preferably made of aluminum or an aluminum alloy. According to this, since the specific gravity of the frame and the joint is smaller than that of iron or the like and is made of lightweight aluminum or aluminum alloy, it is possible to reduce the weight of the entire frame assembly formed by connecting the frames.

  According to the present invention, the frames can be temporarily assembled by simply inserting the pin of the joint into the pin insertion hole of the end surface of the frame, and in this state, the screw is inserted through the screw insertion hole of the joint, By screwing into the screw holes of the frame, the frame can be connected and fixed to the joint, so that the assembly work of the frame becomes easy.

  Further, the frame assembly can be disassembled by a simple operation of loosening and extracting the screw inserted into the screw insertion hole of the joint and extracting the pin of the joint from the pin insertion hole of the frame. Further, the frame end surface is in contact with a predetermined surface of the joint, and is positioned and fixed by a pin and a screw, so that the end surface of the frame is in close contact with the joint and the frame assembly is assembled. Strength and accuracy are increased, and it can be used as a frame or a frame for various manufacturing apparatuses and analysis apparatuses.

It is a disassembled perspective view which shows one Embodiment of the connection structure of the flame | frame of this invention. It is a perspective view of the flame | frame which comprises the connection structure. It is a perspective view of the joint which comprises the connection structure. It is a back perspective view of the joint. The same joint is shown, (a) is a top view, (b) is a front view. The joint is shown, (a) is a left side view, (b) is a right side view. The joint is shown, (a) is a rear view, (b) is a bottom view. The same joint is shown, (a) is sectional drawing along the AA arrow line of FIG.5 (b), (b) is sectional drawing along the BB arrowline of FIG.5 (a). It is. It is a perspective view which shows the frame assembly obtained by the connection structure of this invention. The other embodiment of the connection structure of the flame | frame of this invention is shown, and it is a perspective view of the joint which comprises the connection structure. The same joint is shown, (a) is a top view, (b) is a front view. The joint is shown, (a) is a left side view, (b) is a right side view. The joint is shown, (a) is a rear view, (b) is a bottom view. It is a perspective view which shows the state at the time of assembling a frame assembly using the connection structure of this invention. It is a perspective view which shows the frame assembly obtained by the connection structure of this invention. It is a perspective view which shows other embodiment of the joint used for the connection structure of the flame | frame of this invention. It is a perspective view which shows other embodiment of the joint used for the connection structure of the flame | frame of this invention. The same joint is shown, (a) is a top view, (b) is a front view. The joint is shown, (a) is a left side view, (b) is a right side view. The joint is shown, (a) is a rear view, (b) is a bottom view.

  Hereinafter, an embodiment of a frame connection structure (hereinafter referred to as a “connection structure”) according to the present invention will be described with reference to the drawings. This connecting structure is for connecting frame-shaped frames through a joint to form a frame assembly having a predetermined shape.

  1 to 9 show an embodiment of the connection structure of the present invention. This connection structure includes a plurality of frames 10 and a joint 20 that connects the plurality of frames 10 to each other.

  As shown in FIGS. 1 and 2, the frame 10 has a prismatic shape extending at a predetermined length, and its end surface is substantially square as a whole. A circular pin insertion hole 11 into which a pin 23 (described later) of the joint 20 is inserted is formed at the center of the end surface of the frame 10. The pin insertion hole 11 in this embodiment is formed so as to penetrate along the longitudinal direction of the frame 10, but it may be a hole provided at a depth where the pin 23 can be inserted from the end surface of the frame 10.

  Screw holes 13 are formed in the four corners of the end face of the frame 10. The inside of the screw hole 13 is preferably a through hole communicating with the screw hole 13 on the opposite end surface. Furthermore, a first dovetail groove 15 whose opening width is narrower than the internal width is formed along the longitudinal direction of the frame 10 at the center of each side surface along the longitudinal direction of the frame 10. Further, on a predetermined side surface along the longitudinal direction of the frame 10, a second dovetail groove 17 having a width smaller than that of the first dovetail groove 15 is formed in a portion from the corner of the frame 10 to the first dovetail groove 15. Is formed.

  Next, the joint 20 will be described. As shown in FIGS. 1 and 3 to 8, the joint 20 has a main body 21 having a substantially cubic shape as a whole, and a columnar or cylindrical shape protruding from the center of a predetermined surface of the main body 21. At least three pins 23 to be inserted into the pin insertion holes 11 of the frame 10, and screw insertion holes 25 formed so as to penetrate both sides of the pin projecting surface of the main body 21 and predetermined corners of the opposing surface thereof. have.

  As shown in FIG. 8 (a), a pin insertion hole 27 is formed at a predetermined depth in the center of the predetermined surface of the main body 21, and a female portion is formed on the inner periphery from the center of the bottom of the pin insertion hole 27. A bolt fixing hole 28 in which a screw is engraved is formed.

  On the other hand, in this embodiment, the pin 23 extending at a predetermined length has a cylindrical shape in which a bolt insertion hole 23a is formed at the center in the axial direction. The pin 23 is formed with an outer diameter substantially matching the inner diameter of the pin insertion hole 11 to such an extent that the pin 23 can be inserted into the pin insertion hole 11 of the frame 10. The sticking can be minimized. Further, a chamfer 23 b is provided on the outer periphery of the tip portion of the pin 23 so that the pin 23 can be easily inserted into the pin insertion hole 11.

  Then, by inserting the base end portion of the pin 23 into the pin insertion hole 27 of the main body 21 and screwing the bolt 5 into the bolt fixing hole 28 of the main body 21 through the bolt insertion hole 23a of the pin 23, A pin 23 projects from the center of a predetermined surface of the main body 21. The joint 20 of this embodiment has a structure in which three pins 23 protrude from three surfaces adjacent to each other with one corner C (see FIG. 3) as the center. The pin 23 is not only screwed and fixed with the bolt 5, but may be press-fitted into the pin insertion hole 27, or may be integrally formed with the main body 21 by machining or die casting, etc. Is not to be done.

  3 and 4 and FIG. 8 (b) together, the predetermined angle of the pin projecting surface S1 of the main body 21 from which the pin 23 projects and the pin facing surface S2 facing the pin projecting surface S1. The part is formed with a screw insertion hole 25 so as to penetrate both sides. This screw insertion hole 25 is inserted into the pin insertion hole 11 of the frame 10, and when the sides of the frame 10, the joint 20, and the frame 10 that are square are made to coincide with each other, a predetermined portion of the corner of the frame 10 is determined. It is formed so as to be aligned with the screw hole 13.

  A circular counterbore recess 25 a having a diameter larger than that of the screw insertion hole 25 is formed at the end of the screw insertion hole 25 on the pin facing surface S <b> 2 side. Then, the bolt 5 is inserted into the screw insertion hole 25 from the counterbore recess 25a side of the pin facing surface S2, and its tip protrudes in parallel with the pin 23 from the pin projecting surface S1. A plurality of such screw insertion holes 25 are formed corresponding to the number of pins 23 (three in this embodiment). At this time, in order to prevent the plurality of bolts 5 inserted into the plurality of screw insertion holes 25 from colliding with each other, the screw insertion holes 25 are preferably formed at positions that do not interfere with each other.

  Further, as shown in FIGS. 4 and 8A and 8B, a leg member such as a caster or an adjuster 30 (not shown) is attached to the center of a predetermined surface other than the pin projecting surface S1 of the joint 20. Leg member mounting screw holes 29 are provided. The leg member mounting screw hole 29 in this embodiment is formed on a surface corresponding to the bottom surface of the frame assembly.

  For this reason, a caster support shaft (not shown) is screwed into the leg member mounting screw hole 29, or a support shaft 31 of a height adjuster 30 as shown in FIG. Leg members such as casters and adjusters 30 can be attached to the joint 20. When a caster (not shown) is attached to the joint 20, the frame assembly can be moved smoothly, so that it can be easily installed at a predetermined installation location. On the other hand, in the case of the adjuster 30, the inclination and height of the frame assembly can be adjusted as appropriate by adjusting the screwing depth of the support shaft 31 with respect to the leg member mounting screw hole 29.

  The frame 10 and the joint 20 described above can be formed of a metal such as aluminum, an aluminum alloy, iron, or an iron alloy, or a synthetic resin such as polyacetal or polycarbonate. In particular, it is preferable to form with aluminum or an aluminum alloy. In this case, the frame 10 and the joint 20 are made of aluminum or an aluminum alloy having a specific gravity smaller and lighter than that of iron or the like and having a rigidity higher than that of a synthetic resin or the like. The weight can be reduced, and the connection strength between the joint 20 and the frame 10 can be increased.

  Next, the frame connection procedure and the operation and effects of the connection structure of the present invention having the above structure will be described.

  That is, the pin 23 of the joint 20 is aligned with the pin insertion hole 11 on one end surface in the longitudinal direction of the predetermined frame 10, and the pin insertion hole of the frame 10 until the pin projecting surface S <b> 1 of the joint 20 abuts on one end surface of the frame 10. 11, the pin 23 of the joint 20 is inserted. At this time, since the pin 23 has a cylindrical shape corresponding to the pin insertion hole 11 having a circular shape, the joint 20 can be rotated with respect to the frame 10, and alignment is facilitated. This operation is repeated for the other frame 10, and the other pins 23 of the joint 20 are inserted into the pin insertion holes 11 of the other predetermined frames 10, so that a plurality of frames 10 are connected to each other via the joint 20. Can be temporarily assembled.

  Thus, when the joint 20 and the frame 10 are temporarily assembled, the screw insertion holes 25 of the joint 20 are aligned with the corresponding pin insertion holes 11 of the frame 10. Thereafter, the bolt 5 is inserted into the screw insertion hole 25 from the pin facing surface S2 side of the joint 20, and the tip end portion thereof is projected from the pin projecting surface S1 and screwed into the screw hole 13 of the frame 10. The frame 10 and the joint 20 can be connected and fixed.

  A frame assembly having a desired shape can be assembled by appropriately repeating the above connecting operation. In this embodiment, as shown in FIG. 9, a rectangular parallelepiped frame assembly extending in a predetermined direction is configured, and twelve frames 10 are provided with eight joints 20 arranged at corner portions. Are connected to each other.

  As described above, in this connection structure, the frames 10 can be temporarily assembled only by inserting the pin 23 into the pin insertion hole 11, and the bolt 5 is inserted through the screw insertion hole 25 of the joint 20 in this state. Since the plurality of frames 10 can be connected and fixed to the joint 20 with a simple operation by simply screwing them into the screw holes 13 of the frame 10, the assembly work of the frames 10 can be performed easily and quickly, and workability is improved. Can be made.

  Further, by inserting the cylindrical pin 23 into the circular pin insertion hole 11, the joint 20 and the frame 10 can be temporarily assembled so as to be relatively rotatable. Even if the screw insertion hole 25 of the joint 20 is not firmly aligned, the screw hole 13 and the screw insertion hole 25 can be aligned by simply rotating the joint 20 or the frame 10 as appropriate. Can be done smoothly.

  Further, as shown in FIG. 9, the joint 20 and the frame 10 are positioned by the pin 23 with the longitudinal end face of each frame 10 in contact with a predetermined surface of the joint 20. Since the joint 20 and the frame 10 are fastened and fixed, the frame 10 can be reliably prevented from rotating with respect to the joint 20 and the end surface of the frame 10 is in close contact with each surface of the joint 20. The strength and accuracy of the assembly are increased, and the assembly can be suitably used as a frame or a housing for various manufacturing apparatuses and analysis apparatuses. That is, as in the cited document 1, the frame 10 and the joint 20 are not a structure in which the block and the cylinder are positioned and fixed by the joint (corresponding to the “pin”) of the corner block (corresponding to the “joint”). Since it can be reliably abutted and fixed with screws, it is possible to prevent a gap from being generated between the frame 10 and the joint 20 and to prevent a decrease in connection strength, accuracy, and the like.

  Further, the joint 20 is located at a corner portion where the frames 10 are connected, and the pins 23 and the like are not visible from the outside, and there is nothing particularly protruding outside, so that the appearance of the frame assembly is improved. be able to. Further, in this embodiment, the screw insertion hole 25 of the joint 20 is provided with a counterbore recess 25a, and the head of the bolt 5 enters the counterbore recess 25a. It is possible to prevent the portion from protruding, and the frame assembly can be placed on the installation surface without play.

  By the way, the frame assembly assembled by the connection structure can be used, for example, as a gantry for mounting various devices such as an electrical / electronic component assembling device or a measuring device, or a housing for housing them. . In such applications, it may be necessary to disassemble or resize the frame assembly when various devices are repaired or modified. In this case, the bolts 5 inserted into the screw insertion holes 25 of the joint 20 are loosened and extracted, and the joint 20 and the frame 10 can be easily connected by simply extracting the pins 23 of the joint 20 from the pin insertion holes 11 of the frame 10. Since it can be removed separately, it is possible to easily disassemble and resize the frame assembly.

  In this embodiment, the frame 10 has screw holes 13 formed at four corners of the end surface thereof, and a first dovetail groove extending in the longitudinal direction at the center of each side surface of the frame 10. 15 is formed. According to this, since the screw holes 13 are formed at the four corners of the frame 10, the bolt 5 inserted from the joint 20 can be screwed at any corner. In addition, the first dovetail groove 15 provided in the central portion of each side surface can attach a connection auxiliary tool 40 (see FIGS. 14 and 15) described later, a bracket for attaching a shelf, etc. The weight can be reduced.

  In addition, as shown in FIG. 3, the joint 20 in this embodiment has a structure in which three pins 23 protrude from three surfaces adjacent to each other with one corner C as a center. Therefore, the pin facing surface S2 facing the pin projecting surface S1 of the specific pin 23 does not overlap with the pin projecting surface S1 of the other pin 23, and among the six surfaces of the joint 20 having a cubic shape. Three surfaces are pin projecting surfaces S1, and the remaining three surfaces are pin facing surfaces S2. Therefore, even if all the three pins 23 are inserted into the pin insertion holes 11 of each frame 10, the bolts 5 can be inserted from the remaining three surfaces, so that the connection aid 40 becomes unnecessary.

  Furthermore, in this embodiment, as shown in FIGS. 1 and 2, a predetermined side surface along the longitudinal direction of the frame 10 has a portion extending from the corner of the frame 10 to the first dovetail groove 15. A second dovetail groove 17 having a width smaller than the one dovetail groove 15 is formed. When a frame assembly is used as an assembly device or a measuring device as a mounting base or storage case, it may be necessary to install a relatively small jig or device such as a cable holding plate or ground terminal connection plate. is there. In such a case, the small member as described above can be appropriately attached using the second dovetail groove 17.

  10 to 15 show another embodiment of the frame connection structure of the present invention. In addition, the same code | symbol is attached | subjected to the substantially same part as embodiment shown in the said FIGS. 1-9, and the description is abbreviate | omitted. In this embodiment, the structure of the joint is different from that in the previous embodiment, and the joint and the frame are connected by a connection aid.

  That is, the joint 20a in this embodiment is provided with five pins 23, with the pins 23 projecting from the center of the five surfaces of the six surfaces forming the cubic shape.

  Further, as shown in FIGS. 14 and 15, the connection assisting tool 40 is substantially L-shaped, and both ends thereof have an ant-shaped shape adapted to the first dovetail groove 15, and the frame 10 is formed at both ends. A fixing means is provided. As fixing means, pressure contact pieces 41 and 41 projecting from both longitudinal sides of both ends of the connection assisting tool 40, a plurality of bolt holes 43 formed at both ends of the connection assisting tool 40, and this bolt The bolt 5 is screwed into the hole 43. And while inserting the edge part of the connection auxiliary tool 40 in the 1st dovetail groove | channel 15, screwing the volt | bolt 5 in the bolt hole 43, and crimping | bonding the front-end | tip part to the bottom face of the 1st dovetail groove | channel 15, The pressure contact pieces 41, 41 are respectively pressed against both sides 15 a, 15 a (see FIG. 2) of the narrow opening of the one dovetail groove 15, and the respective frames 10 are connected and fixed to the joint 20 a.

  In the connection structure having the above structure, for example, a stand-like frame assembly as shown in FIG. 15 can be configured. That is, as shown in FIG. 14, the surface of the joint 20 on which the pin 23 is not protruded is the lower surface, and the back surface side of the L-shaped connecting aid 40 is the upper surface of the joint 20 and each orthogonal to it. Set on the side. In this state, the pins 23 projecting from the four side surfaces of the joint 20a are inserted into the pin insertion holes 11 of the four frames 10, respectively, and one end portion of the coupling aid 40 is inserted into the first dovetail groove of each frame 10. 15 respectively. Thereafter, the frame 10 is lowered from the upper surface of the joint 20a, and the pins 23 on the upper surface are inserted into the pin insertion holes 11 of the frame 10, and the other end portions of the four connection aids 40 are connected to the four first Insert into the dovetail groove 15 respectively. Then, the bolt 5 is screwed into the bolt hole 43 of each connection assisting tool 40, and the tip portion thereof is crimped to the bottom surface of the first dovetail groove 15, and both sides 15 a and 15 a of the narrow opening portion of the first dovetail groove 15. (See FIG. 2) By pressing the pressure contact pieces 41, 41, the frames 10 are connected and fixed to the joint 20a, and a stand-like frame assembly as shown in FIG. 15 can be assembled.

  As described above, when the frame 10 is connected to the five surfaces of the joint 20a, the frame 10 is disposed on the opposing surfaces of the joint 20a, and the screw insertion hole 25 is hidden. By using the connection auxiliary tool 40, the intersecting frames 10 can be appropriately connected. Moreover, the frame 5 can be disassembled by removing the frame 10 from the joint 20a by loosening the bolt 5 which is a fixing means of the connection aid 40 and sliding the frame 10 away from the joint 20a.

  FIG. 16 shows another embodiment of the joint used in the connection structure of the present invention. Note that substantially the same parts as those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

  That is, the joint 20b in this embodiment is provided with three pins 23 each having a pin 23 projecting from the center of three surfaces, one opposing surface and one surface orthogonal to those surfaces. ing. According to this embodiment, each pin 23 of the joint 20b is inserted into the pin insertion hole 11 of each of the three frames 10, and the joint 20b and the frame 10 are connected by the connection aid 40 and the bolt 5. A frame assembly having a structure different from that of the above embodiment can be assembled.

  17 to 20 show still another embodiment of the joint used in the connection structure of the present invention. Note that substantially the same parts as those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

  That is, the joint 20c in this embodiment is provided with pins 23 projecting from the centers of four surfaces, one opposing surface and two surfaces orthogonal to each other and orthogonal to each other. Two pins 23 are provided. In this embodiment as well, each pin 23 of the joint 20c is inserted into the pin insertion hole 11 of each of the four frames 10, and the joint 20c and the frame 10 are connected by the connection aid 40 and the bolt 5. Thus, a frame assembly having a structure different from that of the above embodiment can be assembled.

5 Bolt 10 Frame 11 Pin insertion hole 13 Screw hole 15 First dovetail groove 15a, 15a Both sides 17 Second dovetail groove 20, 20a, 20b, 20c Joint 21 Main body 23 Pin 23a Bolt insertion hole 23b Chamfer 25 Screw insertion hole 25a Counterbore Recess 27 Pin insertion hole 28 Bolt fixing hole 29 Leg member mounting screw hole 30 Adjuster 31 Support shaft 40 Connecting aid 41 Pressure contact piece 43 Bolt hole C Corner portion S1 Pin projecting surface S2 Pin facing surface

Claims (8)

A frame connecting structure that connects columnar frames through joints,
The frame has a substantially square shape as a whole, a circular pin insertion hole is provided at the center, and a screw hole is formed at a predetermined corner,
The joint as a whole has a substantially cubic shape, at least three pins protruding from the center of a predetermined surface of the main body in a columnar shape or a cylindrical shape, and inserted into a pin insertion hole of the frame, A screw insertion hole formed so as to penetrate both sides of the pin projecting surface of the main body and a predetermined corner portion of the opposing surface thereof,
The frame and the joint are connected by inserting the pin of the joint into the pin insertion hole of the frame and screwing the screw inserted through the screw insertion hole of the joint into the screw hole of the frame. The frame connection structure characterized by.   The frame has a shape in which the screw holes are respectively formed at four corners of an end surface, and a first dovetail groove is formed in the center of at least one side surface of the frame along the longitudinal direction. The frame connection structure according to 1.   A second dovetail groove having a width smaller than that of the first dovetail groove is formed on at least one side surface of the frame where the first dovetail groove is formed at a portion extending from a corner of the frame to the first dovetail groove. The frame connecting structure according to claim 2, wherein the frame is formed along a longitudinal direction. It is a frame connection structure that connects columnar frames through joints and connection aids,
The frame has a shape in which an end surface thereof is substantially square as a whole, a circular pin insertion hole is provided at the center, and a first dovetail groove is formed on at least one side surface,
The joint includes a main body having a substantially cubic shape as a whole, and at least three pins that protrude from the center of a predetermined surface of the main body in a columnar shape or a cylindrical shape and are inserted into the pin insertion holes of the frame. And
The connection aid is substantially L-shaped, and both ends thereof have a dovetail shape that fits the first dovetail groove, and both ends are provided with means for fixing to the frame,
The joint pin is inserted into the pin insertion hole of the frame, and both ends of the connection aid are inserted into the first dovetail of the corresponding frame, and both ends of the connection aid are accommodated by the fixing means. A frame connecting structure, wherein the frame and the joint are connected by being fixed to a frame.   A frame connection structure comprising the connection structure according to claim 1 and the connection structure according to claim 4.   The frame connection structure according to any one of claims 1 to 5, wherein a screw hole for attaching a leg member is provided in the center of one surface of the joint.   The joint has a pin on three surfaces adjacent to each other with one corner as a center, and has a pin on three surfaces, one opposing surface and one surface orthogonal to those surfaces, 7. The method according to any one of claims 1 to 6, comprising a combination of two opposing surfaces and two surfaces orthogonal to each other and two surfaces orthogonal to each other, and having a pin on five surfaces. The connecting structure of the described frame.   The frame connection structure according to any one of claims 1 to 7, wherein the frame and the joint are made of aluminum or an aluminum alloy.

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