WO2009092486A1 - Handle for a particularly motor-driven tool - Google Patents

Abstract

The present invention relates to a handle, particularly an auxiliary handle, for a tool, particularly a motor-driven tool, comprising a grip (2), a clamping ring (3) connected to the grip (2), and a clamping/fixing device (4) fixing the clamping ring (3) on the grip (2) and clamping the clamping ring (3) on the tool, wherein the clamping/fixing device (4) simultaneously fixes the clamping ring (3) on the grip (2) and clamps the clamping ring (3).

Description

 description

title

Handle for a particular motor-driven tool

State of the art

The present invention relates to a handle, in particular an auxiliary handle, for a tool, in particular a motor-driven tool.

Such handles are known from the prior art in different embodiments. These handles are commonly used on electric tools, e.g. an electric drill o.a. used to allow holding the electric tool with both hands on different handles. For example, from DE 79 27 713.7 Ul an additional handle for a rotary hammer is known, which comprises a handle and a clamping ring. The handle is fastened by means of a screw on the clamping ring and the clamping ring is made open and has two tabs on which a thumbscrew is provided. The clamping ring can be clamped or unlocked by tightening or loosening the thumbscrew. However, such a configuration has a plurality of different parts and for clamping an undesirable screwing operation is necessary.

Further, from DE 41 32 058 Al an additional handle for a drill o.a. known, in which the clamping ring also has two tabs through which a long screw is passed. This long screw also serves to fix a handle, with a clamping or loosening of the clamping ring is achieved by turning the handle. In this embodiment, although the number of parts is reduced, but it may happen in particular that in a heavy use of the electric tool, the handle is rotated unintentionally, whereby a loosening of the clamping ring of the power tool occurs. This can result in dangerous situations for a user of the handle.

Advantages of the invention The handle according to the invention with the features of claim 1 has the advantage over that it allows a simple and secure terminals and has a very cost-effective structure. A clamp-fixing device clamps a clamping ring on the tool and at the same time the clamping ring is fixed to the handle. This is inventively achieved in that the handle comprises a clamping fixing device which fixes the clamping ring on the handle and at the same time biases the clamping ring on the tool during the fixing process. As a result, the number of parts can be kept low, which has a favorable effect on the production costs and the assembly costs.

The dependent claims show preferred developments of the invention.

Preferably, the clamp-fixing device is pivotally arranged about an axis. As a result, a clamping or releasing of the clamping ring can be carried out by a pivoting movement, so that o.a. can be waived.

As a result, in particular a quick and easy handling of the handle is possible.

More preferably, the clamp-fixing device comprises a pivot lever with an eccentric and is pivotally mounted on the handle. The eccentric area comes into contact with the clamping ring and thus enables the clamping operation.

More preferably, the handle comprises a U-shaped receptacle having a first free leg, a second free leg and a connecting region connecting the legs. The clamping ring comprises an annular, open

Clamping area, wherein a first tab and a second tab is arranged on the open part. The first and second tabs are directed outwardly from the clamping area and are arranged in the assembled state in the U-shaped receptacle of the handle. Here, a particularly compact structure is realized. Furthermore, an outer shape of the handle can be realized without projecting parts, since the protruding tabs are arranged in the handle. A fixing of the clamping ring on the handle takes place in the U-shaped receptacle and also can be done by the fact that the two tabs are directed into the U-shaped receptacle, a clamping of the clamping ring. Preferably, the handle comprises a first pin and a second pin, which are arranged at the connection region of the U-shaped receptacle. Further, in at least the first tab, a first and a second through-hole are formed, and each one of the two pins is disposed in one of the through holes. As a result, a simple and secure fixation of the clamping ring is obtained on the handle.

More preferably, a latching recess is formed on the second tab, which can be brought into engagement with the eccentric region of the pivot lever. Thereby, a latching connection between the pivot lever and the clamping ring is provided. Furthermore, a click during clamping of the clamping ring can be generated by the latching recess when the eccentric portion of the pivot lever is pivoted into the latching recess. As a result, a user can be signaled by the clicking sound successful clamping of the clamping ring.

More preferably, the handle comprises a spring element, which after a release of the

Connection between the pivot lever and the clamping ring opens the clamping ring. The spring element is arranged between the first and second tab. After opening, the handle on the tool, for example, can be pivoted and fixed in another position relative to the tool again.

According to a further preferred embodiment of the present invention, the second tab of the clamping ring on a third passage opening, in which the first pin of the handle is arranged. This ensures that the clamping ring is fixed both by means of the first tab and by means of the second tab on the pin of the handle.

In order to obtain in particular a secure fit in the radial and axial direction of the tool, the clamping ring preferably on the inner circumference of a screening, which engages in the clamped state of the clamping ring in correspondingly formed areas on the tool. The screening is preferably formed by inwardly projecting elongated portions which are aligned in the axial direction of the clamping ring. These projecting areas engage in correspondingly formed recesses on the tool. Alternatively, the screening can also be formed by recesses on the inner circumference of the clamping ring, which in the tensioned - A -

Condition then come with appropriately formed protruding areas on the tool in engagement.

Furthermore, the present invention relates to a tool, in particular a power tool with a handle according to the invention, which is provided in the tool as an additional handle.

drawing

Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. In the drawing is:

1 shows a schematic, perspective view of a handle according to a first embodiment in the open state, which is partially shown in section,

FIG. 2 is a schematic, perspective view of that shown in FIG

Handle from a different perspective, also partially shown in section,

Figure 3 is an exploded view of that shown in Figures 1 and 2

Handle,

FIG. 4 shows a perspective view of the handle of FIGS. 1 to 3,

Figure 5 is a schematic sectional view of a handle according to a second embodiment of the invention, and

Figure 6 is a schematic, perspective view of a clamping ring according to the second embodiment.

Preferred embodiments of the invention Hereinafter, a handle 1 according to a first embodiment of the invention will be described in detail with reference to Figures 1 to 4. The handle shown in the figures is an auxiliary handle, which is arranged, for example on a power tool in a front region of the power tool to allow a secure gripping of the power tool.

As can be seen in particular from FIGS. 1 and 3, the handle 1 comprises a handle 2, on which a user's hand engages, and a clamping ring 3. The clamping ring 3 is connected to the handle 2 via a clamping fixing device 4. The clamp-fixing device 4 comprises a pivoting lever 5, which by means of a bolt

6 is pivotally mounted on the handle 2. The bolt serves as a pivot axis. Next, a U-shaped receptacle 7 is formed on the handle 2, which comprises a first free leg 8, a second free leg 9 and a connecting portion 10 connecting the two free legs 8, 9. In the first free leg 8, a first bore 8a is formed and in the second free leg 9, a second bore 9a is formed. As can be seen from the exploded view of FIG. 3, the bolt 6 is passed through the two bores 8a, 9a and, as can be seen from FIGS. 1 and 2, the pivoting lever 5 is provided with a bore 5b through which the bolt 6 passes is. Between the bolt 6 and the pivot lever 5 while a press fit is formed and the bolt can be pivoted in the two holes 8 a, 9 a.

As can further be seen from FIG. 4, a first journal 11 and a second journal 12 are formed on the inside of the connecting region 10 of the U-shaped receptacle 7. The first pin 11 is slightly shorter than the second pin 12. The pins 12 have a cylindrical shape and are arranged in the middle between the first free leg 8 and the second free leg 9. An axial direction of the pins 11, 12 is parallel to the longitudinal direction of the legs 8, 9.

The clamping ring 3 of the handle 1 is formed as an open ring and includes an open annular clamping portion 30, a first tab 31 and a second tab 32. The two tabs 31, 32 are disposed at the open ends of the clamping portion 30 and are from the clamping portion 30 after directed outside. As can be seen in particular from FIG. 3, a first through-opening 35 and a first through-opening 35 are in the first tab 31 second passage opening 36 formed. In the second tab 32, a third Durchgangsöffhung 37 is formed. Furthermore, a latching recess 33 in the form of a groove is formed on the second tab 32. The recess has a semi-cylindrical shape and extends over the entire width of the second tab 32 and is disposed on the outside of the second tab. On the inside of the

Clamping region 30, a plurality of protruding portions 34 is further formed. The projecting portions 34 are longitudinal projections directed in the axial direction of the clamping ring 3, which are each arranged at a predetermined distance from each other along the entire inner circumference of the clamping ring 3. On a tool in which the handle 1 is to be used, correspondingly formed recesses are provided which come into engagement with the projecting portions 34 during clamping of the clamping ring and fix the handle 1 on the tool. The projecting portions 34 thereby provide a securing of the handle in both the axial direction and in the circumferential direction.

In the mounted state, as can be seen in particular from FIGS. 1 and 2, the second pin 12 is guided through both the second through-opening 36 on the first tab 31 and through the third through-opening 37 on the second tab 32. One end of the first pin 11 abuts an inner side of the second tab 32 (see FIG. A spring element 13 is provided in the form of a spiral spring and is slipped over the first pin 11. The spring element 13 has the task of opening the clamping ring 3 after loosening the clamping-fixing device 4 by pressing against the inner sides of the tabs 31, 32. By the U-shaped receptacle 7 with the two pins 11, 12 is thus ensured that the clamping ring 3 can be securely fixed to the handle 2. When the pivot lever 5 is mounted on the handle 2, the clamping ring 3 is securely held on the handle 2, since the free end of the U-shaped receptacle 7 is blocked by the pivot lever 5. A mounting of the clamping ring 3 to the handle 2 takes place such that the clamping ring 3 is first inserted from the free end of the U-shaped receptacle 7 ago in the U-shaped receptacle 7. The spring element 13 is clamped in advance in the region of the first passage opening 35 between the first tab 31 and the second tab 32, so that the spring element 13 is pushed over the first pin 11 during assembly. The second pin 12 is through the second passage opening 36 in the third passage opening 37th passed. Then, the pivot lever 5 is fixed by means of the bolt 6 on the handle 2, so that the clamping ring 3 is secured.

A clamping of the clamping ring 3 in the clamping state is then carried out by pivoting the pivot lever 5 from the open position shown in Figures 1 and 2. At the

Swivel lever 5 is an eccentric 5a provided, which comes through the pivoting operation with the second tab 32 into contact and presses the second tab 32 in the direction of the first tab 31. When the rocker arm 5 is pushed completely downwards, the eccentric region 5a engages with the latching recess 33, whereby a clicking sound is generated. The eccentric region 5a is in the

Locking recess 33 secured so that unintentional release of the pivot lever and thus a release of the clamping ring 3 is avoided.

Since the tabs 31, 32 of the clamping ring 3 and the clamp-fixing device 4 are arranged in the U-shaped receptacle 7, it can be prevented that the handle 1 in the tensioned state protruding parts o.a. available. This results in a better field of view while working with the tool and it can be avoided that projecting parts interfere with, for example, hard to reach places of a workpiece. Only in the open state of the clamping lever 5 is slightly ahead, which occurs only in a repositioning of the handle. Further, by the projecting portions 34, which form a grid on the inside of the clamping ring 3, provide a secure positive locking, both in the circumferential direction and in the axial direction between the clamping ring and the tool. Next, no screw o.a. be provided, which can usually be solved or tightened only cumbersome or with the aid of a tool. The clamping by means of

Clamping levers 5 and the release is easy and possible with little effort. Furthermore, the handle 1 according to the invention has only a minimal number of parts, so that its production is particularly cost-effective. In particular, the handle 2 may for example be made of a plastic material by means of injection molding, wherein the pins 11, 12 and the U-shaped receptacle 7 integral with the actual

Hand part of the handle are formed. Also, the clamping ring 3 can be inexpensively manufactured by injection molding. As a result, the handle 1 according to the invention has a significantly reduced number of individual parts. Hereinafter, a handle according to a second embodiment of the invention will be described with reference to Figures 5 and 6, wherein the same or functionally identical parts are denoted by the same reference numerals as in the first embodiment.

The handle of the second embodiment substantially corresponds to that of the first embodiment, wherein in contrast to the second embodiment additionally a reinforcing rib 40 is provided. The reinforcing rib 40 is, as can be seen in FIG. 5, arranged below the second journal 12 and supports the second journal 12. The reinforcing rib 40 is formed integrally with the second pin 12. As further seen in FIG. 6, a slot 41 is formed in the first tab 31 of the clamping ring 3. The slot 41 in this case points from the outermost end of the first tab 31 to the second passage opening 36. The slot 41 has a width which corresponds to a width of the reinforcing rib 40. This allows the clamping ring 3 easily over the first and second -

Pins 11, 12 and the reinforcing rib 40 are inserted into the U-shaped receptacle 7. Thus, a gain of the second pin 12 can be achieved in a simple manner. Otherwise, this embodiment corresponds to the previous embodiment, so that reference can be made to the description given there.

Claims

claims First handle, in particular additional handle, for a tool, in particular a motor-driven tool comprising - A handle (2), - a clamping ring (3) which is connected to the handle (2), and a clamping fixing device (4), which fixes the clamping ring (3) on the handle (2) and clamps the clamping ring (3) on the tool, wherein the clamping fixing device (4) simultaneously the clamping ring (3) on the handle (2) fixed and clamped the clamping ring (3). 2. Handle according to claim 1, characterized in that the clamping Fixing device (4) is arranged pivotably about an axis. 3. Handle according to claim 2, characterized in that the clamping fixing device (4) comprises a pivot lever (5) with an eccentric region (5a) and is pivotally mounted on the handle (2). 4. Handle according to claim 3, characterized in that the handle (2) has a U-shaped receptacle (7) with a first free leg (8), a second free leg (9) and a leg (8, 9) connecting Connecting portion (10) and the clamping ring (3) has an annular, open clamping portion (30) having a first tab (31) and a second tab (32), wherein the first tab (31) and the second tab (32) from Clamping region (30) are directed outwardly and wherein the first and second tab in the assembled state in the U-shaped receptacle (7) of the handle (2) are arranged. 5. Handle according to claim 4, characterized in that the handle (2) further comprises a first pin (11) and a second pin (12) which on the connecting portion (10) of the U-shaped receptacle (7) are arranged and in the first tab (31) of the clamping ring (3) is formed a first through hole (35) and a second through hole (36) and in the assembled state each one of the pins (11, 12) in one of Through openings (35, 36) is arranged. 6. Handle according to one of claims 4 or 5, characterized in that on the second tab (32) has a latching recess (33) is formed, which with the eccentric region (5a) of the pivot lever (5) is engageable to a latching connection between the To provide pivoting lever (5) and the clamping ring (3). 7. Handle according to one of claims 4 to 6, further comprising a spring element (13) which is arranged between the first tab (31) and the second tab (32) and which after releasing the connection between the pivot lever (5) and the Clamping ring (3) opens the clamping ring (3). 8. Handle according to one of claims 5 to 7, characterized in that the second tab (32) of the clamping ring (3) has a third passage opening (37), in which in the mounted state, the first pin (11) of the handle (2). is arranged. 9. Handle according to one of the preceding claims, characterized in that the clamping ring (3) on the inner circumference of the annular clamping portion (30) has a grid (34) which engages in the tensioned state of the clamping ring (3) in correspondingly formed areas on the tool, to fix the handle on the tool. 10. Tool, in particular power tool, comprising a handle according to one of the preceding claims.