WO2008058873A1

WO2008058873A1 - Screwdriver with grip

Info

Publication number: WO2008058873A1
Application number: PCT/EP2007/061977
Authority: WO
Inventors: Martin Strauch
Original assignee: Wera Werk Hermann Werner Gmbh & Co. Kg
Priority date: 2006-11-18
Filing date: 2007-11-07
Publication date: 2008-05-22
Also published as: EP2089189B1; DE102006054477A1; EP2089189A1; DE102006054477B4

Abstract

The invention relates to a screwdriver with a grip, which has a hand gripping zone (5) which can change its shape, for introducing a torque, comprising at least one portion (5') of the hand gripping zone (5) that is deformed when a torque is introduced, wherein the grip has a core part (1), bearing a blade (3), and a sleeve part (2), surrounding the core part (1), wherein the sleeve part (2) can be turned with respect to the core part (1) and the deforming of the portion (5') of the hand gripping zone (5) results from a rotational displacement of the sleeve part (2) with respect to the core part (1). The deformable portion (5') is a sub-portion (4') of a soft plastic insert (4) on the outside of the sleeve, which, as a radially inwardly protruding tooth, lies in a tooth gap (10) of the core part (1).

Description

Screwdriver with handle

The invention relates to a screwdriver with handle, wherein this has a form variable Handumgriffszone, for introducing a torque having at least a portion of the Handumgriffszone which deforms upon introduction of a torque, wherein the handle has a blade-carrying core part and a core part surrounding the sleeve part wherein the sleeve part is rotatable relative to the core part and the deformation of the portion of the hand gripping zone results from a rotational displacement of the sleeve part relative to the core part.

Such a screwdriver is previously known from US 4,768,406. The screwdriver has a prismatic core part and a sleeve surrounding this core part. Between sleeve inner wall and Prisma outer surface are rolling bodies that move relative to the core sleeve relative rotation of the sleeve, so that deforms the sleeve part.

From US 3,752,202 a screwdriver is previously known, in which a sleeve is attached to a core part.

A similar screwdriver describes the US 6,668,689 Bl. Again, a sleeve is attached to a core part.

US 3,189,069 describes a screwdriver with a handle having a core part. The core part has groove-like axial recesses engage in the inwardly projecting ribs of a sleeve part.

DE 101 08 672 A1 describes a handle for a key. A handle body is rotatably mounted on a shaft. DE 10 2005 037504 B3 describes a handle for a screw tool with a handle casing made of plastic, in which longitudinally extending chambers are located.

WO 2006/069759 describes a screwdriver with a core which is surrounded by a rubber-elastic, deformable sleeve. The sleeve has axially extending chambers which are filled with air or a liquid. The handle can be compressed by the hand embracing it in the radial direction, so that its shape changes. As a result, an improved torque entry should be possible.

From DE 42 19 253 Al a multi-component existing handle for a tool is known. The handle has a core that is surrounded by a mantle. In cavities of the shell are soft plastic fields, which promote the grip and thus the torque portability.

From DE 29 12 930 Ul a handle for a screwing tool is known in which a foam jacket lies on a core. The foam is compressible and delayed recoverable. By embracing the handle, the foam can dodge radially inwardly. It then form recessed grips, which also serve to improve the application of force.

The invention has the object of developing a genus in proper screwdriver nutzsvorteilhaft.

The object is achieved by the invention specified in the claims, wherein each claim represents an independent solution to the problem and can be combined with any other claim in any form. First and foremost, it is proposed that the deformable portion is a portion of a sleeve outer side soft plastic insert, which rests as a radially inwardly projecting tooth in a tooth space of the core part. It is further provided that the sleeve part is limited in rotation angle with respect to the core part rotatable. The rotation angle limitation can be done via a stop. But it is also envisaged that the sleeve member against an elastic restoring force from a basic position in a rotational position relative to the core member is rotatable. Again, a stop may be provided to limit the angle of rotation. The elastic restoring force increases with increasing angle of rotation. An attack is therefore basically not required. In a further development of the invention, it is provided that the two grip parts in each case cooperate with one another and form stops or counterstops which limit the angle of rotation. The core part may have a non-circular and in particular polygonal cross-section. This core part can einliegen with rotational play in a corresponding cavity of the sleeve part. Stop flanks of the core part can then interact with counter-stop flanks of the sleeve part. The restoring force is generated by a deformed during the rotation soft plastic part. This soft plastic part is part of the soft plastic insert. This soft plastic part forms the tooth, which rests in a tooth gap of the core part. The tooth is thus a continuation of this soft plastic part. The soft plastic part penetrates a window in the bottom of a depression into which the soft plastic insert is injected. If core part and sleeve part are rotated against each other, then the tooth-shaped extension of the soft plastic part can be forced out of the tooth space. It is displaced outward in the radial direction. The surface of the soft plastic zone bulges outwards. This torque-dependent curvature formation changes the grip profile. It arises in the circumferential direction a bead or a bead upstream recess. This increases the force application. Unlike the cited prior art, these radial bulges are not by a radial pressure which creates the hand that encompasses the handle. The radial bulges rather arise by applying a torque. These are torque-dependent deformations that are resilient. The core part can be made of hard plastic. The sleeve part is preferably made of hard plastic. The soft plastic inserts which are inserted in recesses of the sleeve part can be introduced there by injection molding. The soft plastic inserts can be prefabricated in an alternative but also as mounting hardware. They can then be inserted into corresponding recesses of the sleeve part. They can also be glued. The soft plastic inserts can be interconnected via webs, so that they form an overall ring shape. In addition, be provided interlocking means to hold the soft plastic inserts in the recesses. For example, the walls of the recesses may be undercut. In one embodiment of the invention, the sleeve part is not only cushioned in the circumferential direction relative to the core part. It is also cushioned in the axial direction relative to the core part. For this purpose, an attenuator can be provided, which lies between a radial projection of the core part and a radial projection of the sleeve part. Preferably, the damping part is a rubber-elastic ring. This can be provided in the region of a handle tip. The grip tip can be made of steel and are in pulse-transmitting operative connection to the blade. The screwing tool can then be used as a chisel. The hammer blows applied to the handle tip are damped by the attenuator. The grip sleeve can also be stored as it were floating between two damping rings.

An embodiment of the invention will be explained below with reference to accompanying drawings. Show it: 1 is a view of a screwdriver,

2 shows the blade-side end view of the embodiment shown in FIG. 1, FIG.

3 is a section along the line III - III in Fig. 2,

4 is a section along the line IV - IV in Fig. 1,

5 shows a section along the line V - V in Fig. 1,

6 is an exploded view of the individual components of the screwdriver,

Fig. 7 is a view according to FIG. 4, but in a twisted position, and

Fig. 8 is a representation according to FIG. 5, but in a twisted position.

The screwdriver consists of a steel blade 3. On this inserted a made of hard plastic handle core part 1. The handle core part 1 has a polygonal cross-section. Corner regions of the polygonal cross-section form stops 6. This is a hexagonal geometry.

The core part 1 is inserted into a grip sleeve part 2. For this purpose, the grip sleeve part 2 has a Axialhöhlung. The cross-sectional outline contour of the axial cavity of the sleeve part 2 is adapted to the cross-sectional ground plan shape of the core part 1 such that the core part 1 rests in the sleeve part 2 with a small rotational angular movement clearance. Flanks of the cavity of the sleeve part 2 form counter stops 7 for the stops 6 of the core part. 1 The sleeve part 2 has a multiplicity of soft plastic inserts 4 arranged equidistantly in the circumferential direction. A total of two soft plastic zones arranged one behind the other in the axial direction are provided, each of which forms six individual soft plastic inserts 4.

Two diametrically opposed soft plastic inserts 4 continue with extensions 4 ¹ into the cavity of the sleeve part 2. Here, the soft plastic extends through an open in the radial direction of the window of the grip sleeve 2. The extensions 4 ¹ grab it in conformal tooth spaces 10. In a basic position, the core member 1 has the sleeve part 2, such a rotational orientation that a rotational movement in both directions of rotation until a stop position is possible in which the stop edge 6 comes against the counter-stop edge 7. In the course of this rotational movement is applied to the tooth-like projection 4 ¹ of Weichkunststof fernläge 4 of the walls of the tooth gap 10, a shearing force. As a result, as shown in FIG. 7, the tooth-like extension 4 ^{1 of} the soft plastic insert 4 is controlled out of the tooth gap 10 in regions. This also builds up an elastic restoring force. This deformation continues through the window in a surface deformation of the soft plastic insert 4. The outer wall of the Weichkunststof fernläge 4 is a sub-zone 5 ¹ a Handumgriff szone 5. This Han handle grip zone 5 is covered by the hand of a user when he wants to rotate the handle of the screwdriver for introducing a torque in the head of a screw. When applying a torque and the associated deformation or evasive movement of the soft plastic tooth 4 ¹ from the tooth gap 10, a portion 5 ¹ of Handumgriffszo- ne 5 bulges radially outwards and forms an additional resistance to the user's hand. The diameter of the handle will be slightly larger in this area. This increases the screwing, as higher torques can be introduced against this resistance. If the handle is released from the user's hand, the soft plastic tooth 4 ¹ dips back into the tooth gap 10. In this case, the core part 1 is rotated back again into the basic position with respect to the sleeve part 2. In the area of the hand gripping szone 5, the handle may have a circular cross-section. As long as only a small torque is applied to the handle, he retains this circular floor plan. When the torque is increased, however, subareas of the hand gripping zone 5 bulge outward in the radial direction, so that the outline contour is no longer round.

As can be seen from Figures 5 and 8, 2 more rotary end stops are provided between the core part 1 and sleeve part. An abutment extension 8 of the sleeve part 2 protrudes in the radial direction inwards into a recess 14 of the core part. This recess 14 has two side walls 9, which act as counter stops to the stop 8. The stop 8 is seated with a corresponding rotational movement clearance in the recess 14th

The force for generating the bulge 5 ¹ can not only be generated via a soft plastic zonal engagement in a corresponding recess 10 of the core part. In embodiments, not shown, lever drives or wedge controls can cause the radial bulging. It is considered to be particularly advantageous that the bulges 5 ^{1 carried out} by applying a torque.

Of independent importance is the Tordierbarkeit the sleeve part relative to the core part. This increases the screwing comfort, as occurring during hard screwing punches are intercepted. This is advantageous if the screwing tool according to the invention is used as a counter-holding tool to an electric screwdriver. The hard screw case is damped. When using the screwing tool as a purely hand-operated tool but the previously discussed hard screwing does not occur. Even then that is Torsion function advantageous because the application of high torque in the final phase of the Einschraubbetätigung made noticeably softer. It is thereby avoided a "twisting" of the screw head, since the actuator feels through the relative rotation between the sleeve part 2 and core part 1, the load limit. The twistability thus allows a noticeable reaching the maximum torque, so that a shear of the screw is avoided.

The attenuating member is thereby formed by the above-mentioned Weichkunststofffortsatz 4 ¹ , which dips into a corresponding recess 10 of the core member and holds in a basic position, the two parts 1, 2 in a middle neutral position. From this neutral position, the sleeve part 2 can be rotated relative to the core part 1 in both directions. In the course of the rotation, an elastic restoring force builds up. This ensures the return to the basic position following the torque application.

In the exemplary embodiment, a section 3 ^{1 of} the blade 3 projects into a striking cap 12 made of steel, which is assigned to the core part 1. On the radial step 15 is an elastic ring 11. This fills a gap between a radial step 16, which is associated with the sleeve part 2 and the radial step 15 of the impact cap 12. According to this embodiment, the sleeve part 2 is not only floating in the circumferential direction on the core part 1 stored , It is also mounted floating against the damping element 11 in the axial direction on the core part 1.

If the tool is used as a chisel, then the damping ring 11 acts shock absorbing.

Also, at the blade end of the handle, such a damping ring may be provided. The core part 1 can be plugged into the sleeve part 2. From the hollow of the sleeve part 2 protrude in diametrically opposed locking projections 17 in locking recesses of the core part 2. These locking recesses are formed by a latching step 18, which are overcome in the nesting of core part 1 and sleeve part 2.

FIG. 5 shows an additional or alternative stop limiting the rotatability of the core part 1 relative to the sleeve part 2. The ring designated by the reference number 19, which surrounds the core part 1 in the hollow of the sleeve part 2, serves for this purpose. Two diametrically opposite axially projecting tongues 20 of the ring 19 engage in depressions 21 of the core part 2. The two walls 21 'of the recess 21 serve as stop flanks for the two corresponding narrow sides of the tongue 20. The ring 19 can thus rotate slightly relative to the core part 1. But it is also envisaged that the measured width in the circumferential direction of the tongue 20 corresponds to the distance between the two stop flanks 21, so that the ring 19 is rotatably associated with the core part 1.

The ring 19 forms two diametrically opposed radial pockets 14. In each of these pockets 14 engages a radially inwardly directed extension 8 of the inner wall of the sleeve part 2. The circumferentially measured width of the stop extension 8 is smaller than the measured width in the circumferential direction of the recess 14. The two walls 9 of the recess 14 thus serve as rotation limiting stops.

The ability to twist of the sleeve part 2 relative to the core part 1 is effected according to an elastic element 4 ¹ acting between sleeve part 2 and core part 1. This elastic element 4 ¹ may be designed such that the deformation takes place only when a limit torque is exceeded. Is at- For example, with the screwing only a small torque, for example, applied when "twirling", so sleeve part 2 and core part 1 should move against each other. The elastic element 4 ¹ retains its shape at these low torques. It can be biased to some extent.

All disclosed features are essential to the invention. The disclosure of the associated / attached priority documents (copy of the prior application) is hereby also incorporated in full in the disclosure of the application, also for the purpose of including features of these documents in claims of the present application.

Claims

A screwdriver with a handle having a form-variable hand gripping szone (5), for inducing a torque, with at least a portion (5 ¹ ) of the Handumgriffszone (5), which deforms upon introduction of a torque, wherein the handle is a Blade (3) carrying the core part (1) and a core part (1) surrounding sleeve part (2), wherein the sleeve part (1) relative to the core part (1) is rotatable and the deformation of the portion (5) of the Handumgriffszone (5) resulting from a rotational displacement of the sleeve part (2) relative to the core part (1), characterized in that the deformable portion (5 ¹ ) is a partial section (4 ¹ ) of a sleeve outer side soft plastic insert (4), as radially inwardly projecting tooth in a tooth gap (10) of the core part (1) rests.

2. Screwdriver according to claim 1 or in particular according thereto, characterized by at least one stop (6, 7, 8, 9) for the rotation angle limitation.

3. Screwdriver according to one or more of the preceding claims or in particular according thereto, characterized in that the sleeve part (2) against an elastic restoring force from a basic position in a twisted position relative to the core part (1) is rotatable.

4. Screwdriver according to one or more of the preceding claims or in particular according thereto, characterized by a one of the two handle parts (2) associated stop (6, 8), with a Umfangss- drehabstand between two counter-stops (7, 9) of the other two handle parts (1, 2) is located.

5. Screwdriver according to one or more of the preceding claims or in particular according thereto, characterized in that the restoring force is generated by the deformed during the rotation soft plastic part (4 ¹ ).

6. Screwdriver according to one or more of the preceding claims or in particular according thereto, characterized in that the soft plastic part (4 ¹ ) is a partial section of a sleeve part outer side soft plastic insert (4).

7. screwdriver according to one or more of the preceding claims or in particular according thereto, characterized in that the rotation of the sleeve part (1) relative to the core part (2) with a deformation of a sleeve part on the outside arranged soft plastic zone (5 ¹ ) of the hand gripping szone (5) accompanied.

8. Screwdriver according to one or more of the preceding claims or in particular according thereto, characterized in that the deformation is the result of an evasive movement of a tooth gap (10) at least partially out-controlled, the soft plastic zone (5 ¹ ) associated tooth (4 ¹ ).

9. Screwdriver according to one or more of the preceding claims 12 or 13 or in particular according thereto, characterized in that the sleeve part (2) against the restoring force of at least one elastic damping member (11) in the axial direction displaceable on the core part (1) sits.

10. Screwdriver according to one or more of the preceding claims, characterized in that the elastic damping member is a ring (11) which is arranged between the sleeve part (2) and core part (1).

11. Screwdriver according to one or more of the preceding claims or in particular according thereto, characterized by a handle cap associated Stahlschlagkappe (12), which is in pulse-transmitting operative connection with the blade (3).

12. Screwdriver according to one or more of the preceding claims, characterized in that the relative deformability between a sleeve part (2) and core part (1) arranged, the twistability enabling elastic element (4 ¹ ) takes place only when a limit torque is exceeded.

13. Screwdriver according to one or more of the preceding claims, characterized by a according to elastic bearing floating on a core part (1) mounted sleeve part (2).