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DE-102025130008-A1 - Socket wrench to prevent spinning on damaged screw elements

DE102025130008A1DE 102025130008 A1DE102025130008 A1DE 102025130008A1DE-102025130008-A1

Abstract

A socket designed to prevent stripping on damaged fasteners, featuring a drive section at one end with a drive opening for positive engagement with a removal tool. The other end of the socket is a working section with a working opening designed to receive a bolt or nut. This working opening comprises several symmetrically arranged engagement surfaces. In a top view, these engagement surfaces are rotated at an angle relative to the center of the working opening. In a side view, the upper portion of each engagement surface is vertical, while the lower portion is a conically inclined surface with an obtuse angle. This design ensures a reliable positive fit even on bolts or nuts that have been reduced in size by wear, effectively preventing the socket from stripping.

Inventors

  • Ching-Ti Lin

Assignees

  • HUNG WEI INDUSTRIAL CO., LTD.

Dates

Publication Date
20260513
Application Date
20250729
Priority Date
20241029

Claims (8)

  1. Socket wrench for preventing slippage in the case of damaged screw elements, characterized in that : - the socket wrench (10) has at a first end a drive section (11) with a drive opening (12) designed for positive locking with a disassembly tool (1); - the socket wrench (10) has at the second end opposite the drive section (11) a working section (13) with a working opening (14) designed for positive locking with a screw or nut (2); - the working opening (14) has several symmetrically arranged engagement surfaces (141) wherein the engagement surfaces (141) are each rotated in plan view by an offset angle (θ 1 ) relative to a radial orientation to the center of the working opening (14); and - that the upper section of each engagement surface (141) is formed in side view as a vertical surface (142) at an angle of 90° to the horizontal, wherein the lower section of each engagement surface (141) is formed as a conically inclined surface (143) at an obtuse angle to the horizontal, and wherein the conically inclined surface (143) is additionally twisted by a torsion angle (θ 3 ).
  2. socket Claim 1 , characterized in that the offset angle (θ 1 ) of the engagement surfaces (141) is 3°.
  3. socket Claim 1 , characterized in that the obtuse angle (θ 2 ) of the conically inclined surface (143) is 93°.
  4. socket Claim 1 , characterized in that the torsion angle (θ 3 ) of the conically inclined surface (143) is 3°.
  5. socket Claim 1 , characterized in that the drive opening (12) is square in shape.
  6. socket Claim 1 , characterized in that the drive opening (12) is hexagonal.
  7. socket Claim 1 , characterized in that the working opening (14) is hexagonal.
  8. socket Claim 1 , characterized in that the working opening (14) is square.

Description

The present invention relates to a socket for preventing slippage in the case of damaged screw elements, in particular a socket structure designed in such a way as to effectively prevent slippage (so-called “stripping”). It is known that screws or nuts can be damaged by so-called "over-tightening" or "rounded edges", which makes normal loosening with conventional tools difficult or impossible. A key reason for this lies in the design of the screws and nuts themselves. Particularly with common hexagonal screws and nuts, the contact area between the tool and the workpiece is often too small, resulting in gaps that lead to uneven force transmission and low torque transmission efficiency. Another common cause of damage is excessive tightening torque. For example, using a screwdriver with excessive torque – such as an electric or pneumatic screwdriver without a suitable torque limiter – can lead to exceeding the load tolerable by the screw material. This can result in the edges of the screw heads becoming rounded or, in extreme cases, the screw head breaking off. To avoid this, the use of hand tools or mechanical torque wrenches is recommended. Finally, using the wrong size tool can also cause damage. Every screw or nut has a corresponding wrench size. If a tool that is too small is used, the screw can be loosened with increased force, but the force transmission is inefficient, leading to excessive wear or damage to the screw head. The inventor has been involved in the development and manufacture of such products for many years and possesses extensive practical experience. Starting with the common problem of stripping (so-called "stripping") of conventional screws and nuts, he has, with innovative spirit and a clear understanding of the shortcomings of the prior art, developed a socket to prevent stripping of damaged screw elements. The invention is based on the objective of creating a socket that serves to prevent slippage in the case of damaged screw elements. This problem is solved according to the invention by a socket for preventing slippage in the case of damaged screw elements, which has the features specified in claim 1. Further advantageous embodiments of the invention will become apparent from the features of the dependent claims. According to the invention, a socket is provided to prevent slippage when dealing with damaged fasteners. At one end, the socket has a drive section with a drive opening for frictional engagement with a disassembly tool. At the opposite end, a working section is formed, featuring a working opening for positive engagement with a bolt or nut. The working opening is provided with several symmetrically arranged engagement surfaces. In a top view, these engagement surfaces are rotated at an offset angle relative to the center of the working opening. In a side view, the upper section of each engagement surface has a vertically oriented surface, while the lower section is designed as a conically inclined surface at an obtuse angle to the horizontal. Even if a bolt or nut is worn down, the conically inclined surface allows for reliable engagement, thus preventing slippage of the socket and significantly improving its functionality. This constitutes the essential advantage and intended effect of this invention. According to the invention, the offset angle of the engagement surfaces is 3°. According to the invention, the obtuse angle of the conically inclined surface is 93°. According to the invention, the torsion angle of the conically inclined surface is 3°. According to the invention, the drive opening is square in shape. According to the invention, the drive opening is hexagonal in shape. According to the invention, the working opening is hexagonal in shape. According to the invention, the working opening is square in shape. The invention and its embodiments are explained in more detail below with reference to the drawing. The drawing shows: 1 a perspective and a partially cutaway view of a first embodiment of a socket according to the invention; 2 a top view of the first embodiment of the socket according to the invention; 3 a section along line BB in 2 ; 4 a section along line FF in 3 ; 5 a schematic representation of the application state according to the first embodiment of the socket according to the invention; 6 a section along line GG in 5 ; 7 a schematic representation of the use of the first embodiment to prevent over-tightening of worn screw elements; 8 a section along line HH in 7 ; 9 a cutaway view of a second embodiment of a socket according to the invention; 10 a top view of the second embodiment of the socket according to the invention; 11 a cut along line SS in 10 ; and 12 a section along the line MM in 11 . 13 a schematic representation of the use of the second embodiment to prevent over-tightening of worn screw elements; and 14 a section along line TT in 13 . In order to enable experts familiar with this technical subject matter to gain a deeper understanding of t