DE102008044182A1 - Additional handle for a hand tool - Google Patents

Abstract

The handle (31) has a fastening strap (37) for fixing the handle at a section of a manual tool machine. A support section is brought into contact with the section. A grip element (26) holds the handle. The support section is formed by an insert (41), which is fixedly connected with the strap and is made of elastically deformable plastic i.e. elastomer. Elevations are arranged at a side of the insert, where the side faces away from the strap. The elevations extend transverse to a plane stretched by a fastening chamber (38). The insert includes segments (42, 43) spaced relative to each other.

Description

The The invention relates to an auxiliary handle for a hand tool, like a drill, a hammer drill or a chisel hammer, with a fixing section for fixing the auxiliary handle a section of the hand tool that at least one with the section of the power tool machine can be brought into investment section and a handle member for holding the auxiliary handle.

At hand-held machine tools become such additional handles as side handles, for example on a housing section device side adjacent to the tool holder for leadership the hand tool provided as needed. Im stipulated Condition of the auxiliary handle on the hand tool can when drilling over the additional handle an occurring when blocking the tool Torque be caught.

From the DE 37 31 059 A1 an auxiliary handle is known, which has a clamping band as a fixing portion, which is clamped by rotating the handle member, wherein the abutment portion of the fixing portion comes into contact with the portion of the power tool. In the clamped state forces are transmitted via the created frictional connection between the fixing section and the section of the power tool.

adversely The known solution is that this compound is under Load can slip through. In particular, over a longer Useful life of the power tool is due to wear Smooth grinding of the fixing section and the corresponding section the hand tool, so that even with clamping forces slipping on a high level can not be prevented can. In addition, the corresponding section, z. B. a housing section, the power tool when applying high clamping forces deform such that a secure fixing of the auxiliary handle on the hand tool is no longer possible.

From the DE 36 19 520 A1 an additional handle is known, the fixing portion has a latching nose, which engages in the clamped state of the auxiliary handle in longitudinal notches on the housing portion of the power tool. In the clamped state forces are transmitted via the created positive connection between the fixing section and the housing portion of the power tool.

adversely The known solution is that form-fitting Compounds an increased design effort and thus higher costs in the production of the auxiliary handle and condition the hand tool. Furthermore, the additional handle not infinitely adjustable at the fixing section.

task The invention is an auxiliary handle for a hand tool to provide, which does not have the aforementioned disadvantages and in particular a simple, repeatable tightening of the auxiliary handle the power tool while ensuring a secure connection guaranteed.

The The object is achieved by the features of the independent claim solved. Advantageous developments are in the dependent claims explained.

According to the invention is the contact portion of an at least partially arranged, firmly connected to the fixing portion insert formed, made of an elastically deformable plastic is.

by virtue of the additional, firmly connected to the fixing section Insole becomes a higher coefficient of friction in the specified state of the additional handle between the abutment portion of the power tool and the fixing section of the auxiliary handle generates as if no deposit on the fixing section is provided. It can thus be compared to a direct at the contact portion of the power tool fitting fitting section transmit relatively higher forces, which improves the reliability of the power tool is. Due to the increased frictional engagement between the hand tool machine and the auxiliary handle become the necessary clamping forces for a sufficiently secure fixing of the auxiliary handle reduced. By inserting jerky force changes transferred only reduced to the user holding the hand tool, what the leadership and work with the hand tool considerably simplified during operation. The insert also dampens the power tool generated vibrations advantageous in all Axles, so that they are not in full size on the additional handle and thus transferred to the user. When relaxing a fixed auxiliary handle which stretches with the fixing section firmly connected insert made of an elastically deformable plastic again and returns to its original form.

Advantageously, the insert is fixed by means of a suitable adhesive to the fixing section or applied by vulcanization on this. In a variant of the deposit is on Festlegeabeab cut applied in an injection molding process. Essential in the way of fixing the insert is their secure fixation on the fixing portion of the auxiliary handle.

Preferably the insert is made of an elastomer and is particularly advantageous made of a rubber, whereby an advantageous coefficient of friction between the contact portion of the power tool and the fixing section the additional handle is guaranteed. It is also through an insert made of an elastomer advantageous damping possible vibrations ensured. An insert from an elastomer has advantageous deformation properties and a low wear on.

Prefers are on the side facing away from the Festlegeabschnitts side of the insert provided a plurality of spaced elevations, which also in the fixed state have a free space in which Accumulating accumulate impurities that are so in the Essentially away from the contact points. When bracing of the fixing section, the elevations are first deformed and only then, if available, on the elevations adjacent area of the insert is deformed.

With the arrangement and design of the surveys can be targeted different properties of the insert in relation to the required Forces to determine the auxiliary handle, in relation to their deformation behavior and in relation to the resulting Controlling damping properties in different axes.

Preferably The fixing section surrounds a clamping space and the elevations extend transversely to a plane spanned by the clamping space, with an advantageous orientation for receiving impurities between the surveys is guaranteed as well as low Clamping forces for fixing the auxiliary handle on the power tool required are. The clamping space has a substantially cylindrical or conical design with a lateral surface on. Advantageously, the elevations are exactly in the direction of a Generatrix of this lateral surface. Alternatively, proceed the elevations transverse or oblique to the direction of a surface line of the clamping space. The orientation of multiple surveys in relation to The generatrix of the clamping space does not have to be mandatory for all elevations to be rectified. For example, all or at least single of the several surveys from each other different orientations in relation to the corresponding generatrix of the clamping space.

Prefers The insert comprises several, separate segments, thus advantageous Deformation properties of the insert are guaranteed. An insert of several segments has better deformation properties as an example sleeve-shaped insert on.

are the segments provided in regions and spaced from each other, which in an advantageous manner sufficiently large open spaces are present for receiving accumulating impurities. surrounds the fixing portion a clamping space and includes the deposit more Segments, these are advantageously spaced from each other circumferentially provided around the clamping space.

Prefers The segments extend transversely to one from the clamping space of the fixing portion is surrounded, spanned plane, bringing a advantageous orientation for receiving impurities between the segments is guaranteed and low clamping forces for fixing the auxiliary handle on the hand tool required are. As already stated above, the clamping space a substantially cylindrical or conical configuration with a lateral surface. In a preferred embodiment the segments extend exactly in the direction of a generating line of the clamping space.

In In an alternative embodiment, the segments run transverse to the direction of a generatrix of the clamping space. The alignment the segments with respect to the generatrix of the clamping space does not have to necessarily be rectified for all segments. For example all or at least some of the segments are different from each other Orientations with respect to the corresponding generatrix of the clamping space on.

Preferably the insert is only partially fixed with the fixing section connected, bringing the deposit in different axes respectively Directions having advantageous deformation properties. At a Locking portion which surrounds a clamping space is the insert, for example along its longitudinal extension over a vertical specified sub-range fixed to the fixing section. alternative the insert is fixed only at end regions with the fixing section connected.

Preferably, at least a portion of the insert at least partially in a direction transverse to a clamping space, which is surrounded by the clamping portion, spanned plane extending, convex outer contour, whereby when setting the auxiliary handle on the power tool only a portion of the insert is first deformed , With the only regional deformation of the at least one part of the insert, the elastic properties of the insert can be in under exploit optimally different stress states.

The Invention will be described below by means of embodiments explained in more detail. Show it:

1 A hand tool with arranged additional handle in plan view;

2 a side view of the auxiliary handle;

3 a detail section along line III-III in 2 in an enlarged view;

4 a side view of a second embodiment of a; and

5 a view of the plant section acc. Line VV in 4 ;

6 a cross section through a third embodiment of an additional handle; and

7 a section through the contact section gem. Line VII-VII in 6 ,

in principle are the same parts in the figures with the same reference numerals Mistake.

In the 1 is a hand tool 7 with an inventive additional handle 11 shown as a side handle, attached to a cylindrical section 8th the hand tool machine 7 is releasably fixed. The auxiliary handle 11 protrudes substantially perpendicularly from a working axis 9 the hand tool machine 7 from.

The auxiliary handle 11 as he is in the 2 and 3 shown in detail, has a handle element 26 for easy gripping and secure holding of the auxiliary handle 11 on. The grip element 26 Advantageously, at least partially, a portion of an elastic material and is further particularly advantageous ergonomic design.

The auxiliary handle 11 points to the definition of the power tool 7 a fixing section 16 on, in this example, a strap 17 includes. The fixing section 16 is via a clamping mechanism 27 on the hand tool 7 clamped, wherein a contact portion of the fixing section 16 with the section 8th the hand tool machine 7 comes into contact and the auxiliary handle 11 securely held to the same. The clamping mechanism 27 is by turning the handle element 26 around the handle axis 28 actuated. Alternative to a strap 17 can the fixing section 16 may also be formed by a plurality Festelegeabschnitten, which at a correspondingly trained section 8th the hand tool machine 7 attack.

The abutment section is of a fixed to the fixing section 16 associated deposit 21 formed, made of an elastically deformable plastic, in particular made of an elastomer, and only partially in the fixing section 16 established. The fixing section 16 surrounds a clamping space 18 , where is the deposit 21 over most of the longitudinal extent of the clamping space 18 surrounding part of the fixing section 16 extends. The clamping mechanism 27 has a pressure piece 29 with one with the section 8th the hand tool machine 7 in Appendix coming up page. At this side of the pressure piece 29 is an edition 30 provided of an elastically deformable plastic.

Due to the deposit 21 becomes a higher coefficient of friction between the section 8th the hand tool machine 7 and the fixing section 16 the auxiliary handle 11 generated when he in a direct investment of the fixing section 16 at the section 8th the hand tool machine 7 given is. The auxiliary handle 11 is in any orientation to the hand tool 7 on the same braced, with a secure fixing of the auxiliary handle 11 on the hand tool 7 is guaranteed.

The auxiliary handle 31 , according to the 4 and 5 , indicates the inside of the strap 37 as a fixing section 36 a deposit 41 on, the several, separate segments 42 and 43 consists of an elastically deformable plastic and which forms the contact section. The segments 42 and 43 are provided in regions and spaced from each other. The clamping space 18 has a substantially cylindrical lateral surface. The segments 42 extend in the direction of a generatrix 39 of the clamping space 18 , The segments 43 extend transversely or obliquely to the direction of a generating line 39 of the clamping space 18 , The segments 42 and 43 are using an adhesive as an adhesive the inside of the tension band 37 established.

The auxiliary handle 51 , according to the 6 and 7 , indicates the inside of the strap 57 as a fixing section 56 a deposit 61 on which at the the fixing section 56 opposite side with a plurality of spaced elevations 62 is provided and which forms the investment section. The fixing section 56 surrounds a clamping space 58 and the surveys 62 extend transversely to one of the clamping space 58 clamped plane, along a generatrix one of the clamping space 58 formed lateral surface. The surveys 62 are partially and spaced from each other at the deposit 61 educated. The deposit 61 as well as the surveys 62 have in this example one in the Direction of a generatrix of the clamping space 58 extending, spherical outer contour on.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 3731059 A1 [0003]
• - DE 3619520 A1 [0005]

Claims (9)

Additional handle for a hand tool ( 7 ) with a fixing section ( 16 ; 36 ; 56 ) for setting the auxiliary handle ( 11 ; 31 ; 51 ) on a section ( 8th ) of the portable power tool ( 7 ), at least one with the section ( 8th ) of the portable power tool ( 7 ) has abuttable contact portion, and with a handle element ( 21 ) for holding the auxiliary handle ( 11 ; 31 ; 51 ), characterized in that the abutment portion of at least partially arranged, fixed to the fixing portion ( 16 ; 36 ; 56 ) linked deposit ( 21 ; 41 ; 61 ) is formed, which is made of an elastically deformable plastic. Additional handle according to claim 1, characterized in that the insert ( 21 ; 41 ; 61 ) is made of an elastomer. Additional handle according to claim 1 or 2, characterized in that at the the fixing section ( 56 ) facing away from the insert ( 61 ) several, spaced surveys ( 62 ) are provided. Additional handle according to claim 3, characterized in that the fixing section ( 56 ) a clamping space ( 58 ) and the surveys ( 62 ) transversely to one of the clamping space ( 58 ) extend spanned plane. Additional handle according to one of claims 1 to 4, characterized in that the insert ( 41 ) several segments ( 42 . 43 ). Auxiliary handle according to claim 6, characterized in that the segments ( 42 . 43 ) are provided in regions and spaced from each other. Additional handle according to claim 5 or 6, characterized in that the segments ( 42 . 43 ) transversely to one of the clamping space ( 38 ) coming from the fixing section ( 36 ), spanned plane extending. Additional handle according to one of claims 1 to 7, characterized in that the insert ( 21 ) only partially fixed to the fixing section ( 16 ) connected is. Additional handle according to one of claims 1 to 8, characterized in that at least a part of the insert ( 61 ) at least partially in a direction transverse to one of the clamping space ( 58 ) coming from the fixing section ( 56 ) is surrounded, spanned plane extending, spherical outer contour has.