ratchet key structure
The ratchet wrench structure addresses assembly and manufacturing challenges by using a design where the elastic element's diameter matches the contact surface widths, ensuring stable fixation and easy assembly, thus reducing complexity and costs.
Patent Information
- Application Number
- DE202025107420
- Authority / Receiving Office
- DE · DE
- Patent Type
- Utility models
- Current Assignee / Owner
- Filing Date
- 2025-12-02
- Publication Date
- 2026-04-30
- Estimated Expiration
- 2035-12-31
AI Technical Summary
Conventional ratchet wrench designs face challenges such as the need for drilling a spring receptacle during metal injection molding, which is labor-intensive and costly, and assembly complexity due to small diameters, making it cumbersome and expensive to manufacture.
A ratchet wrench structure with a main body, ratchet wheel, pawl, and elastic element where the elastic element's first diameter matches the width of the contact surfaces, ensuring stable fixation within the recess, allowing for easier assembly and reduced manufacturing costs.
The design provides stable contact and easy assembly by fixing the elastic element within the recess, reducing manufacturing complexity and costs while ensuring the elastic element remains securely in place.
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Abstract
Description
Technical field
[0001] The invention relates to a ratchet wrench structure, in particular a ratchet wrench structure in which the first contact surface has a first width and a second width. The first diameter corresponds approximately to the first width and the second width. When the first end rests against the first contact surface, it is bounded by the first contact surface, the second contact surface, the third contact surface, and the second receiving space. The first end cannot move upwards, downwards, left, or right within the recess. The recess confines the first end. State of the art
[0002] American patent no. 8272297 B1, also Taiwanese patent no. 100217195, document no. M 423025 and titled "Disposable ratchet wrench for easy assembly", discloses a disposable ratchet wrench for easy assembly comprising:
[0003] a ratchet wrench body, the ratchet head of which has a through-hole for mounting a ratchet wheel which is provided with a toothed surface on its outer circumferential side, wherein the side wall of the receiving hole forms an inwardly recessed arc groove, characterized in that an arc-shaped component consists of an arc-shaped block, a spring and a pawl.
[0004] The shortcomings of this conventional ratchet wrench are as follows: 1. How the exploded view of the arc-shaped component in Fig. As shown in Figure 2, the spring 22 lies between the arc-shaped block 21 and the pawl 23. The spring 22 is flexible. To prevent the spring 22 from slipping off the arc-shaped block 21, the block is provided with a spring receptacle 212 to hold the end of the spring 22. Since the arc-shaped block 21 is manufactured by metal injection molding, the spring receptacle 212 cannot be integrated into the mold but must be drilled. In smaller ratchet wrenches, the arc-shaped block 21 is small, and consequently, the inner diameter of the spring receptacle 212 is also small. There is also a positioning issue with the spring receptacle 212. Drilling the spring receptacle 212 is more labor-intensive. 2. The spring 22 is mounted between a rod 231 and the spring holder 212. During assembly, both hands must be used to align one end of the spring 22 with the spring holder 212 and the other end with the rod 231. In the smaller version of the ratchet wrench, the diameters of the spring holder 212 and the rod 231 are very small, making the assembly of the arc-shaped block 21, the spring 22, and the pawl 23 quite cumbersome. 3. The arched block 21 is fitted with a wing plate 211. The arched block 21 is manufactured by metal injection molding. The wing plate 211 is a thin sheet. The upper and lower molds of the arched block 21 must form a narrow cavity for the wing plate 211. Manufacturing the upper and lower molds of the arched block 21 is difficult, and shaping the wing plate 211 is also not easy. The cost of the upper and lower molds of the arched block 21 is therefore relatively high. Object of the invention
[0005] The problem to be solved by the invention is as follows: In the conventional ratchet wrench design, a spring receptacle is provided to receive the end of the spring. Since the arc-shaped block is manufactured by metal injection molding, the spring receptacle cannot be integrated into the mold but must be drilled. In the ratchet wrench design of the invention, the first contact surface has a first width and a second width. The first diameter is approximately equal to the first and second widths. When the first end rests against the first contact surface, it is bounded by the first contact surface, the second contact surface, the third contact surface, and the second receiving space. The first end cannot move up, down, left, or right within the recess. The recess confines the first end.
[0006] The technical solution to the problem is as follows: A ratchet wrench structure comprising: a main body having a first receiving space and a second receiving space; a ratchet wheel having a ratchet part and a fitting part; a pawl having a toothed segment, a recess, a first bearing surface, a second bearing surface and a third bearing surface, wherein the first bearing surface has a first width and a second width, and wherein the pawl further has a first face and an end face; a boundary element having a fourth face, a fifth face, a sixth face and a first bearing edge;an elastic element that is partially received in the recess and is located between the first contact surface and the fifth surface, whereby the tooth segment meshes with the ratchet part, wherein the elastic element has a first end and a first diameter, the first diameter being approximately equal to the first width and the second width, and wherein the elastic element forms a second end at the other end.
[0007] The advantages compared to the prior art are as follows: The first contact surface has a first width and a second width. The first diameter is approximately equal to the first width and the second width. When the first end rests against the first contact surface, it is bounded by the first contact surface, the second contact surface, the third contact surface, and the second receiving space. The first end cannot move up, down, left, or right within the recess. The recess confines the first end. The first diameter is approximately equal to the first width and the second width. This means the first end has a larger first diameter, resulting in a larger contact area (i.e., a larger contact surface) for the first end and the first contact surface, thus ensuring stable contact.The second end lies against the fifth surface and is located within the first edge of the setup, thus limiting the second end to the first edge of the setup and preventing it from leaving the second recording space. Brief description of the drawings Fig. 1 an exploded view of the ratchet wrench structure of the invention, Fig. 2 a top view of the main body of the ratchet wrench structure of the invention, Fig. 3 a top view of the pawl of the ratchet wrench structure of the invention, Fig. 4 an enlarged representation of zone A in Fig. 3 of the ratchet wrench structure of the invention, Fig. 5 a perspective view from another viewing direction of the pawl of the ratchet key structure of the invention, Fig. 6 a top view of the limiting element of the ratchet wrench structure of the invention, Fig. 7 a top view of the elastic element of the ratchet wrench structure of the invention, Fig. 8 a perspective view of the ratchet wrench structure of the invention, Fig. 9 a side view of the ratchet wrench structure of the invention, Fig. 10 a sectional view along line AA in Fig. 9 of the ratchet wrench structure of the invention, Fig. 11a top view of the elastic element of the second embodiment of the ratchet wrench structure of the invention, Fig. 12a perspective view of the third embodiment of the ratchet wrench structure of the invention, Fig. 13 a perspective view of the limiting element of the third embodiment of the ratchet wrench structure of the invention. Ways to implement the invention
[0008] On Fig. Reference is made to numbers 1 to 8. Fig. Figure 1 shows an exploded view of the ratchet wrench structure of the invention, Fig. Figure 2 shows a top view of the main body of the ratchet wrench structure of the invention, Fig. Figure 3 shows a top view of the pawl of the ratchet wrench structure of the invention, Fig. Figure 4 shows an enlarged view of zone A in Fig. 3 of the ratchet wrench structure of the invention, Fig. Figure 5 shows a perspective view from another viewing direction of the pawl of the ratchet key structure of the invention, Fig. Figure 6 shows a top view of the limiting element of the ratchet wrench structure of the invention, Fig. Figure 7 shows a top view of the limiting element of the ratchet wrench structure of the invention, and Fig. Figure 8 shows a perspective view of the ratchet wrench structure of the invention. The present invention relates to a ratchet wrench structure comprising:
[0009] a main body 10 having at one end a first receiving chamber 11 which is circular, wherein a second receiving chamber 12 is formed on one side of the first receiving chamber 11 which is connected to the first receiving chamber 11, wherein the diameter of the second receiving chamber 12 is smaller than that of the first receiving chamber 11, wherein the center of the second receiving chamber 12 is located inside the first receiving chamber 11, wherein the second receiving chamber 12 is closed at the top and bottom, wherein a first annular groove 13 which is circular is provided in the first receiving chamber 11, wherein the first annular groove 13 is located near the lower opening, and wherein the first receiving chamber 11 forms a first mounting section 14 near the upper opening;
[0010] in two dimensions the first recording space 11 forms a first circle 15 which has a first center 151 and a vertical line 152 through the first center 151, wherein the first circle 151 has a first radius 153, wherein the second recording space 12 forms a second circle 154 which has a second center 155 which lies inside the first circle 15, wherein the second circle 154 has a second radius 156 which is smaller than the first radius 153, wherein there is a first distance 157 between the first center 152 and the second center 155, and wherein a first corner 158 is formed at the intersection points of the first circle 15 and the second circle 154;
[0011] a ratchet wheel 20, which is rotatably arranged in the first receiving space 11 and has a ratchet part 21 on its outer circumferential surface, which is designed in the form of a toothed ring, wherein the ratchet wheel 20 forms an internal fitting part 22, which is dodecagonal, polygonal or quadrilateral, wherein the ratchet wheel 20 is provided with a second annular groove 13 which is aligned with the first annular groove 13, wherein the ratchet wheel 20 forms a second contact section 24 which rests against the first contact section 14;
[0012] a pawl 30, which is arranged in the second receiving space 12 and rests against one side, wherein the front of the pawl 30 is provided with a toothed segment 31 which meshes with the ratchet part 21, wherein the toothed segment 31 has a first arc section 311 which is a convex arc section, wherein a second arc section 312 is formed on each of the two sides of the first arc section 311, wherein the two second arc sections 312 are symmetrical to the first arc section 311 and are convex arc sections, wherein a connecting arc section 313 is formed between the first and the second arc section 311, wherein two connecting arc sections 313 are symmetrical to the first arc section 311 and are nearly arc-shaped, wherein the connecting arc section 313 is tangential to the first arc section 311, and wherein the connecting arc section 313 is tangential to the second arc section 312;
[0013] wherein the first arc section 311 has a third radius 314 and the second arc section 312 has a fourth radius 315, wherein the fourth radius 315 is equal to or nearly equal to the size of the third radius 314;
[0014] wherein the locking pawl 30 forms a recess 32 at one end, wherein the recess 32 has a first contact surface 321, a second contact surface 322 and a third contact surface 323, which extend almost vertically to each other, wherein the first contact surface 321, the second contact surface 322 and the third contact surface 323 are planar, wherein the first contact surface 321 has a first width 324 and a second width 325, wherein the first width 324 and a second width 325 extend vertically to each other, and wherein the first width 324 is equal to the size of the second width 325;
[0015] wherein the pawl 30 has a first surface 33 centrally on its rear side, wherein the first surface 33 abuts the wall of the second receiving space 12 and is convex arcuate or arcuate, wherein a second surface 34 is formed on one side of the first surface 33, wherein the second surface 34 is located between the first surface 33 and the recess 32, does not abut the wall of the second receiving space 12 and is flat, convex arcuate or arcuate, wherein a third surface 35 is formed on the other side of the first surface 33, which is flat, convex arcuate or arcuate, wherein an end surface 36 is formed at the other end of the pawl 30, which faces away from the recess 32 and is located between the third surface 35 and the tooth segment 31;
[0016] wherein the teeth of the tooth segment 31 form a first arc 37, wherein the first arc 37 is coaxial to the first circle 15 and has similar dimensions, wherein the first surface 33 forms a second arc 371, wherein the second arc 371 has the same radius as the second circle 154, wherein a second corner 372 is formed at each of the intersection points of the first arc 37 and the second arc 371, the second corner 372 being close to the first corner 158, wherein a space 373 is formed between the first arc 37, the second arc 371 and the end surface 36, i.e. the end surface 36 does not touch either the first corner 158 or the second corner 372, so that the pawl 30 does not contact either the first corner 158 or the second corner 372;
[0017] a limiting element 40, which is arranged in the second receiving chamber 12 and abuts the opposite side, wherein the limiting element 40 has a fourth surface 41 on its front side, wherein the fourth surface 41 faces the ratchet part 21 and is concavely arcuate, wherein the limiting element 40 has a fifth surface 42 on one side, which faces the recess 32 and is planar, wherein the fifth surface 42 is parallel or nearly parallel to the first contact surface 321, wherein the limiting element 40 has a sixth surface 43 on its rear side, wherein the sixth surface 43 abuts the wall of the second receiving chamber 12 and is convexly arcuate, wherein the limiting element 40 has a first contact edge 44, which faces the second contact surface 322 and is located between the fourth and fifth surfaces 41, 42, and wherein the first contact edge 44 is a projection;
[0018] an elastic element 50, which is partially housed in the recess 32, wherein the elastic element 50 is located between the first contact surface 321 and the fifth surface 42, whereby the tooth segment 31 meshes with the ratchet part 21, wherein one end of the elastic element 50 forms a first end 51 which abuts the first contact surface 321 and has a first diameter 52, wherein the first diameter 52 corresponds to the first width 324 and the second width 325, wherein the other end of the elastic element 50 forms a second end 53 which abuts the fifth surface 42 and has a second diameter 54, wherein the second diameter 54 is smaller than the first diameter 52, and wherein the elastic element 50 is a spring;
[0019] wherein the first diameter 52 corresponds to the first width 324 and the second width 325, whereby the first end 51 is bounded by the first contact surface 321, the second contact surface 322, the third contact surface 323 and the second receiving space 12, so that the first end 51 is fixed in the recess 32 and cannot move upwards, downwards, left or right there, wherein the length, width and height of the recess 32 have the function of bounding the first end 51, wherein the second end 53 is bounded by the first contact edge 44 and therefore cannot detach from the second receiving space 12, whereby the elastic element 50 is fixed between the pawl 30 and the limiting element 40 and cannot detach from the second receiving space 12; and
[0020] a locking ring 60, which is C-shaped and slightly elastic, wherein the locking ring 60 is received in the first annular groove 13 and the second annular groove 23, so that the ratchet wheel 20 is rotatably arranged in the first receiving space 11.
[0021] Further information will be provided on Fig. 9 and Fig. 10 referenced. Fig. Figure 9 shows a side view of the ratchet wrench structure of the invention, Fig. Figure 10 shows a cross-sectional view along line AA in Fig. Figure 9 of the ratchet wrench structure of the invention. The ratchet wheel 20 is rotatably arranged in the first receiving chamber 11. The pawl 30 is received on one side in the second receiving chamber 12. The limiting element 40 is received on the other side in the second receiving chamber 12. The elastic element 50 is located between the first contact surface 321 and the fifth surface 42, so that the toothed segment 31 meshes with the ratchet part 21. By rotating the main body 10 clockwise, the ratchet wheel 20 is rotated.
[0022] Further information will be provided on Fig. 11. Referenced. Fig. Figure 11 shows a top view of the elastic element of the second embodiment of the ratchet wrench structure of the invention. In this embodiment, the difference between the first diameter 52 and the second diameter 54 is smaller. The number of spring coils is particularly high near the first end 51 or the second end 53.
[0023] Further information will be provided on Fig. 12 and Fig. 13 Referenced. Fig. Figure 12 shows a perspective view of the third embodiment of the ratchet wrench structure of the invention and Fig. Figure 13 shows a perspective view of the limiting element of the third embodiment of the ratchet wrench structure of the invention. In addition to the first contact edge 44, the limiting element 40 has a second contact edge 45. The second contact edge 45 and the first contact edge 44 are vertical or nearly vertical to each other. The first contact edge 44 and the second contact edge 45 limit the second end 53. The first end 51 and the second end 53 of the elastic element 50 have the same diameter, i.e., the second diameter 54 corresponds to the first diameter 52.
[0024] The advantages of this ratchet wrench structure are as follows: 1. The first contact surface 321 has a first width 324 and a second width 325. The first diameter 52 corresponds approximately to the first width 324 and the second width 325. When the first end 51 rests against the first contact surface 321, it is bounded by the first contact surface 321, the second contact surface 322, the third contact surface 323, and the second receiving space 12. The first end 51 cannot move upwards, downwards, left, or right within the recess 32. The recess 32 bounds the first end 51. 2. The first diameter 52 corresponds almost exactly to the first width 324 and the second width 325. That is, the first end 51 has a larger first diameter 52, whereby the first end 51 and the first contact surface 321 form a larger contact area, i.e., a larger contact surface, so that a stable contact is achieved. 3. The second end 53 rests against the fifth surface 42 and is located within the first contact edge 44, thus limiting the second end 53 to the first contact edge 44 and preventing it from detaching from the second receiving space 12. The second diameter 54 is smaller. When the pawl 30 retracts, a more concentrated elastic force acts on the second end 53 against the fifth surface 42. 4. The pawl 30, the limiting element 40, and the elastic element 50 can be pre-assembled outside the main body 10. When the hand holds the pawl 30, the limiting element 40, and the elastic element 50, there is a large contact surface between the first end 51 and the recess 32. The second end 53 rests against the fifth surface 42 and is bounded by the first contact edge 44. The pawl 30, the limiting element 40, and the elastic element 50 can then be more easily inserted into the second receiving space 12. 5. The limiting element 40 is arranged in the second receiving chamber 12. The limiting element 40 restricts the maximum retraction range of the pawl 30. The smaller the retraction range of the pawl 30, the easier it is for the pawl 30 to re-engage. 6. The pawl 30 has a simple structure and is easy to machine. No further machining steps are required after the metal injection molding of the pawl 30. The pawl 30 reduces the structural costs of manufacturing the components. The limiting element 40 also has a simple structure. No further machining steps are required after the injection molding of the limiting element 40, thus reducing the structural costs of manufacturing the components. Reference symbol list 10 main bodies 11 First reception room 12 Second Recording Room 13 First ring groove 14 First phase of the plant 15 First Circle 151 First Center 152 Vertical line 153 First radius 154 Second Circle 155 Second Center 156 Second radius 157 First gap 158 First Corner 20 ratchet wheel 21 ratchet part 22 Fitting part 23 Second ring groove 24 Second plant section 30 locking latch 31 tooth segment 311 First arc section 312 Second arc section 313 Connecting arc section 314 Third radius 315 Fourth radius 32 Exclusion 321 First investment area 322 Second plant area 323 Third Plant Area 324 First Broad 325 Second width 33 First area 34 Second area 35 Third area 36 End surface 37 First Bow 371 Second Bow 372 Second Corner 373 space 40 Boundary element 41 Fourth area 42 Fifth area 43 Sixth area 44 First edge of the attachment 45 Second attachment edge 50 Elastic element 51 First End 52 First diameter 53 Second End 54 Second diameter 60 locking ring QUOTES INCLUDED IN THE DESCRIPTION
[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature
[0000] US 8272297 B1
[0002]
Claims
[1] Ratchet key structure, a main body (10) having at one end a first receiving chamber (11) which is circular, wherein a second receiving chamber (12) is formed on one side of the first receiving chamber (11) which is connected to the first receiving chamber (11), wherein the diameter of the second receiving chamber (12) is smaller than that of the first receiving chamber (11), wherein the center of the second receiving chamber (12) is located inside the first receiving chamber (11), wherein the second receiving chamber (12) is closed at the top and bottom, wherein a first annular groove (13) which is circular is provided in the first receiving chamber (11), wherein the first annular groove (13) is located near the lower opening, wherein the first receiving chamber (11) forms a first contact section (14) near the upper opening; in two dimensions the first recording space (11) forms a first circle (15) having a first center (151) and a vertical line (152) through the first center (151), the first circle (15) having a first radius (153), the second recording space (12) forming a second circle (154) having a second center (155) lying inside the first circle (15), the second circle (154) having a second radius (156) that is smaller than the first radius (153), a first distance (157) being between the first center (152) and the second center (155), and a first corner (158) being formed at the intersection points of the first circle (15) and the second circle (154); a ratchet wheel (20) rotatably arranged in the first receiving space (11) and having a ratchet part (21) on its outer circumferential surface, which is designed in the form of a toothed ring, wherein the ratchet wheel (20) forms a fitting part (22) inside, wherein the ratchet wheel (20) is provided with a second annular groove (13) which is aligned with the first annular groove (13), wherein the ratchet wheel (20) forms a second contact section (24) which rests against the first contact section (14); a pawl (30) arranged in the second receiving space (12) and bearing against one side, the front of the pawl (30) being provided with a toothed segment (31) that meshes with the ratchet part (21), the toothed segment (31) having a first arc section (311) which is a convex arc section, wherein a second arc section (312) is formed on each of the two sides of the first arc section (311), the two second arc sections (312) being symmetrical to the first arc section (311) and convex arc sections, wherein a connecting arc section (313) is formed between the first and the second arc section (311), wherein the two connecting arc sections (313) are symmetrical to the first arc section (311) and nearly arc-shaped, the connecting arc section (313) being tangential to the first arc section (311), and wherein the connecting arc section (313) runs tangentially to the second arc section (312);wherein the first arc segment (311) has a third radius (314) and the second arc segment (312) has a fourth radius (315), wherein the fourth radius (315) is equal to or nearly equal to the size of the third radius (314); wherein the locking pawl (30) forms a recess (32) at one end, wherein the recess (32) has a first contact surface (321), a second contact surface (322) and a third contact surface (323) extending almost vertically to each other, wherein the first contact surface (321), the second contact surface (322) and the third contact surface (323) are planar, wherein the first contact surface (321) has a first width (324) and a second width (325), wherein the first width (324) and a second width (325) extend vertically to each other, and wherein the first width (324) is equal to the size of the second width (325); wherein the pawl (30) has a first surface (33) centrally on its rear side, wherein the first surface (33) abuts the wall of the second receiving space (12) and is convex arcuate or arcuate, wherein a second surface (34) is formed on one side of the first surface (33), wherein the second surface (34) is located between the first surface (33) and the recess (32), does not abut the wall of the second receiving space (12) and is planar, convex arcuate or arcuate, wherein a third surface (35) is formed on the other side of the first surface (33), which is planar, convex arcuate or arcuate, wherein an end surface (36) is formed at the other end of the pawl (30), which faces away from the recess (32) and is located between the third surface (35) and the toothed segment (31); wherein the teeth of the tooth segment (31) form a first arc (37), wherein the first arc (37) is coaxial to the first circle (15) and has similar dimensions, wherein the first surface (33) forms a second arc (371), wherein the second arc (371) has the same radius as the second circle (154), wherein a second corner (372) is formed at each of the intersection points of the first arc (37) and the second arc (371), the second corner (372) being close to the first corner (158), wherein a space (373) is formed between the first arc (37), the second arc (371) and the end surface (36), i.e. the end surface (36) does not touch either the first corner (158) or the second corner (372), so that the pawl (30) does not contact either the first corner (158) or the second corner (372); a limiting element (40) arranged in the second receiving chamber (12) and abutting the opposite side, wherein the limiting element (40) has a fourth surface (41) on its front side, the fourth surface (41) facing the ratchet part (21) and being concavely arcuate, wherein the limiting element (40) has a fifth surface (42) on one side, which faces the recess (32) and is planar, the fifth surface (42) being parallel or nearly parallel to the first contact surface (321), wherein the limiting element (40) has a sixth surface (43) on its rear side, the sixth surface (43) abutting the wall of the second receiving chamber (12) and being convexly arcuate, wherein the limiting element (40) has a first contact edge (44) facing the second contact surface (322) and located between the fourth and fifth surfaces (41), (42), and wherein the first attachment edge (44) is a projection; an elastic element (50) that is partially housed in the recess (32), wherein the elastic element (50) is located between the first contact surface (321) and the fifth surface (42), whereby the tooth segment (31) meshes with the ratchet part (21), wherein one end of the elastic element (50) forms a first end (51) that abuts the first contact surface (321) and has a first diameter (52), wherein the first diameter (52) corresponds to the first width (324) and the second width (325), wherein the other end of the elastic element (50) forms a second end (53) that abuts the fifth surface (42) and has a second diameter (54), and wherein the second diameter (54) is smaller than the first diameter (52); wherein the first diameter (52) corresponds to the first width (324) and the second width (325), whereby the first end (51) is bounded by the first contact surface (321), the second contact surface (322), the third contact surface (323) and the second receiving space (12), so that the first end (51) is fixed in the recess (32) and cannot move upwards, downwards, left or right there, wherein the recess (32) has the function of bounding the first end (51), wherein the second end (53) is bounded by the first contact edge (44) and therefore cannot detach from the second receiving space (12), whereby the elastic element (50) is fixed between the pawl (30) and the limiting element (40) and cannot detach from the second receiving space (12); and a locking ring (60) which is C-shaped and slightly elastic, wherein the locking ring (60) is received in the first annular groove (13) and the second annular groove (23) so that the ratchet wheel (20) is rotatably arranged in the first receiving space (11). [2] Ratchet key structure according to claim 1, characterized by , that the fitting part (22) is dodecagonal, polygonal or quadrilateral. [3] Ratchet key structure according to claim 1, characterized by , that the elastic element (50) is a spring. [4] Ratchet key structure according to claim 1, characterized by , that the difference between the first diameter (52) and the second diameter (54) is smaller, with the number of spring coils being particularly high near the first end (51) or the second end (53). [5] Ratchet key structure according to claim 1, characterized by, that in addition to the first contact edge (44) the limiting element (40) has a second contact edge (45), wherein the second contact edge (45) and the first contact edge (44) are vertical or nearly vertical to each other, wherein the first contact edge (44) and the second contact edge (45) limit the second end (53), wherein the first end (51) and the second end (53) of the elastic element (50) have the same diameter, i.e. the second diameter (54) corresponds to the first diameter (52).
Citation Information
Patent Citations
Easy to assemble ratchet wrench
US8272297B1
AMERIKANISCHEPATENTNR.8272297B1