Drive tool with anti-slip function
The drive tool with an obtuse-angled recess and non-parallel flange design addresses wear and slippage issues, ensuring efficient operation on countersunk screws, particularly worn ones, by enhancing clamping force and contact points.
Patent Information
- Authority / Receiving Office
- DE · DE
- Patent Type
- Utility models
- Current Assignee / Owner
- Filing Date
- 2025-12-18
- Publication Date
- 2026-04-02
AI Technical Summary
Conventional drive tools for countersunk screws experience wear and slippage due to mismatched dimensions and material softness, leading to inefficient power transmission and jamming, especially when dealing with worn screws.
The drive tool features an obtuse-angled recess formed by first and second curved surfaces, with varying widths and a non-parallel second drive flange, allowing for multi-point contact and reduced wear, enhancing clamping force and facilitating the removal of worn screws.
The design ensures reliable power transmission and efficient loosening or tightening of countersunk screws by minimizing wear and preventing slippage, even with worn screws.
Smart Images
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Abstract
Description
Technical field
[0001] The present utility model relates to a drive tool with anti-slip function, in particular a drive tool for loosening worn countersunk screws. State of the art
[0002] A conventional countersunk screw typically consists of a countersunk head connected to a threaded portion, and this countersunk head has a slot for a drive tool. This slot is designed to accommodate a suitable drive tool, allowing the countersunk screw to be tightened or loosened. However, due to cost considerations and the fact that countersunk screws are mass-produced, materials are used that are softer than the material of the drive tool. This results in wear on the countersunk screw when it is tightened or loosened by the drive tool.
[0003] Furthermore, using a drive tool whose dimensions do not match the screw's receiving slot also leads to wear of the receiving slot. This can cause the screw's receiving slot to wear down to an almost round opening. As a result, the drive tool jams in the recess, and when turning the countersunk screw, relative sliding occurs between the tool and the screw, preventing the screw from being driven effectively.
[0004] Therefore, after the inner walls of the mounting slot wear down, conventional drive tools can no longer reliably transmit power. This causes the working head to slip easily, resulting in inefficient power transmission by the user, thus necessitating an improvement. Purpose of the present utility model
[0005] Against this background, the main task of the present utility model is to create a drive tool with anti-slip function which, by forming a drive slot connected by a first curved surface to a second curved surface and thereby forming an obtuse-angled recess, enables the depth of this obtuse-angled recess to gradually decrease from deep to shallow from the reference plane towards the handle section, thereby enabling the drive slot to achieve a greater clamping and holding force in conjunction with the receiving recess of a countersunk screw.
[0006] Another objective of the present utility model is to create a drive tool with an anti-slip function in which the drive slot forms an obtuse-angled recess by connecting the first curved surface with the second curved surface, wherein the width of the second curved surface is greater than the width of the first curved surface, thereby creating an uneven width of the recess in order to accommodate a higher torque and thereby reduce the wear of the drive slot.
[0007] Another objective of the present utility model is to create a drive tool with anti-slip function, in which the second drive flange and inclined surface extend from the reference plane towards the handle and the lower end of which falls down to the first drive flange, and through this inclined arrangement a multi-point, non-coaxial contact with the recess of a countersunk screw is possible, which facilitates the disassembly of worn screws.
[0008] According to the invention, these problems are solved with the characterizing features of claim 1, namely in that a drive tool has a handle section 10 and a drive element which are formed integrally together, wherein the drive element has a reference plane with a center point as a virtual axis of rotation and a plurality of contact surfaces are arranged on the surface of the drive element parallel to the axis of rotation, that on each such contact surface there is a drive slot, and thereby forms an obtuse-angled recess which is formed from a first curved surface in conjunction with a second curved surface;that the drive slot is formed from a first and a second curved surface and together have an obtuse-angled recess, wherein the obtuse-angled recess of the drive slot is connected to a second drive flange, wherein the second curved surface is connected to a second drive flange and the second drive flange is not arranged parallel to the axis of rotation, wherein the second drive flange has an inclined surface that gradually slopes from deep to shallow from the reference plane to the handle section and is inclined from the underside of the second drive flange towards the first drive flange. Brief description of the drawings
[0009] The embodiments of the present utility model are described by way of example with reference to the following drawings. They show Fig. 1 a perspective assembly view of a drive tool of a preferred embodiment of the present utility model; Fig. 2 a schematic view of a drive tool of a preferred embodiment of the present utility model; Fig. 3 an enlarged detail view of a drive tool of a preferred embodiment of the present utility model according to Fig. 2; Fig. 4 a top view of a drive tool of a drive tool of a preferred embodiment of the present utility model; and Fig. 5 a further schematic view of a drive tool of a preferred embodiment of the present utility model;. Description of preferred embodiments
[0010] The following section provides a more detailed explanation of the present utility model, with reference to the drawings and exemplary embodiments, regarding the design, function, and advantages of a drive tool with anti-slip function according to the invention. It is understood that the embodiment described here serves only as an example of the principles of the present utility model and that numerous modifications of this embodiment can be made by those skilled in the field without deviating from the scope of the present utility model, which is set out in the claims below.
[0011] A preferred embodiment of a drive tool according to the invention with anti-slip function as described by Fig. The unit shown in 1 to 4 essentially has a handle section 10 and a drive element 20.
[0012] The handle section 10 can be designed as a hexagon key, screwdriver insert, socket wrench insert or other power-transmitting drive tool.
[0013] The drive element 20 is formed integrally with the handle section 10. A reference plane 21 is provided on the drive element 20, the center of which has a virtual axis of rotation 22. A plurality of contact surfaces 23 arranged parallel to the axis of rotation 22 are provided on the surface of the drive element 20 (the number of which corresponds to the number of inner surfaces of the receiving slot of a countersunk screw; in the preferred embodiment, six contact surfaces are provided). A drive slot 24 is located on each contact surface 23.
[0014] The drive slot 24 forms an obtuse-angled recess 243 by connecting a first curved surface 241 with a second curved surface 242, wherein the width of the second curved surface 242 is greater than the width of the first curved surface 241, and the depth of the obtuse-angled recess 243 is dimensioned such that it extends gradually from deep to shallow from the reference plane 21 to the handle section 10. The first curved surface 241 of the obtuse-angled recess 243 is connected to a first drive flange 25. A first drive flange 25 is arranged parallel or non-parallel to the axis of rotation 22. The second curved surface 242 is connected to a second drive flange 26. The second drive flange 26 is arranged non-parallel to the axis of rotation 22.The second drive flange 26 is formed by an inclined surface which gradually slopes from deep to shallow from the reference plane 21 towards the handle section 10 and is inclined with the underside of the second drive flange 26 towards the first drive flange 25, wherein the inclination of the inclined surface has an angle A in the range of 5° to 45°.
[0015] If an undamaged countersunk screw is to be loosened or tightened, the drive element 20 is inserted into the receiving slot of the screw and the screw can be loosened or tightened by turning it towards the handle section 10.
[0016] When a worn countersunk screw needs to be loosened, the drive element 20 is inserted into the worn receiving slot. The connection between the first curved surface 241 and the second curved surface 242 forms an obtuse-angled recess 243. Since the depth of this obtuse-angled recess 243 gradually decreases from deep to shallow from the reference plane 21 to the handle section 10, a greater clamping force can be generated between the drive slot 24 and the receiving slot.
[0017] Since the second curved surface 242 has a greater width than the first curved surface 241, the unequal width creates an obtuse-angled recess 243 to absorb a higher torque and thereby reduce the wear of the drive slot 24.
[0018] When the drive element 20 is inserted into the worn receiving slot of a countersunk screw, the degrees of wear vary at different points; in other words, the worn areas are not necessarily flat or curved surfaces. This is due to the non-parallel arrangement of the second drive flange 26 to the axis of rotation 22 and its inclined surface (angle of inclination 5° to 30°), which extends from the reference plane 21 towards the handle section 10 and is inclined from the underside of the second drive flange 26 towards the first drive flange 25. This inclined arrangement of the second drive flange 26 allows for multi-point, non-coaxial contact with the receiving recess of the countersunk screw, which facilitates the removal of worn countersunk screws.
[0019] Referring to Fig.5 the drive element 20 and the handle section 10 are formed in one piece and have a drive slot 24 which is arranged opposite to the previously described design in order to enable the user to loosen countersunk screws in the opposite direction of rotation.
[0020] In summary, the drive tool with anti-slip function of the present utility model achieves a heat-storing effect through the insulating material arranged in the air cushion channel. Both the structural improvement and the functional enhancement are evident. Since the subject matter was neither published nor publicly used prior to the application, it meets the requirements of novelty, inventive step, and industrial applicability and is therefore duly filed for patent application. Reference symbol list 10 Handle section 20 drive element 21 Reference plane 22 axis of rotation 23 Plant area 24 drive slots 241 First curved surface 242 Second curved surface 243 obtuse-angled depression 25 First drive flange 26 Second drive flange A tilt angle
Claims
[1] A drive tool with anti-slip function has a handle section (10) and a drive element (20) which are formed in one piece together, wherein the drive element (20) has a reference plane (21) with a center point as a virtual axis of rotation (22) in the center and a plurality of contact surfaces (23) are arranged on the surface of the drive element (20) parallel to the axis of rotation (22), characterized by, that on each such mounting surface (23) there is a drive slot (24), and thereby forms an obtuse-angled recess (243) which is formed from a first curved surface (241) in conjunction with a second curved surface (242);that the drive slot (24) is formed from a first and a second curved surface (241, 242) and together have an obtuse-angled recess (243), wherein the obtuse-angled recess (243) of the drive slot (24) is connected to a second drive flange (251), wherein the second curved surface (241) is connected to a second drive flange (251), and the second drive flange (26) is not arranged parallel to the axis of rotation, wherein the second drive flange (26) has an inclined surface that gradually slopes from deep to shallow from the reference plane (21) to the handle section (10) and is inclined from the underside of the second drive flange (26) towards the first drive flange (25). [2] Drive tool according to claim 1, characterized by , that the second curved surface (242) has a greater width than the width of the first curved surface (241). [3] Drive tool according to claim 1, characterized by, that the depth of the obtuse-angled depression (243) from the reference plane (21) to the handle section (10) gradually increases from deep to shallow. [4] Drive tool according to claim 1, characterized by , that the first drive flange (25) is arranged parallel to the axis of rotation. [5] Drive tool according to claim 1, characterized by , that the first drive flange (25) is not arranged parallel to the axis of rotation. [6] Drive tool according to claim 1, characterized by , that the second drive flange (26) has an inclined surface which gradually slopes from deep to shallow from the reference plane (21) towards the handle section (10) and is inclined with the underside of the second drive flange (26) towards the first drive flange (25), and wherein the inclination of the inclined surface has an angle A in the range of 5° to 45°.