TWI864427B - Ratchet wrench - Google Patents

Abstract

A ratchet wrench has a force-applying arm and a working head connected to each other, the working head is formed with an insertion hole, the insertion hole is used for accommodating a driving member and a positioning member, the positioning member is injection-molded with plastic material, an external force is applied to the positioning member, the positioning member is deformed by the external force, so that the positioning member is assembled with the working head, and the driving member is positioned on the working head. Thereby, manufacturing cost is reduced, and components can be easily assembled.

Description

Ratchet wrench

The present invention relates to a ratchet wrench, and more particularly to a low-cost, easy-to-assemble ratchet wrench.

According to Taiwan Patent Publication No. 533951 (hereinafter referred to as '951), a "one-way ratchet wrench structure improvement" is disclosed. The following description uses the component names and diagrams of '951. Please refer to the first figure of '951. The main body is provided with a through-receiving portion, and an annular groove is provided near the upper edge of the receiving portion for the buckle ring to buckle the cover body into the annular groove of the main body, so as to limit the ratchet body in the receiving portion.

From the first figure of ’951, ’951 needs to form ring grooves in the body and cover for assembling the buckle ring, but both ring grooves must be processed using Computer Numerical Control (CNC). Therefore, in addition to increasing manufacturing costs, production capacity utilization is also greatly reduced.

Furthermore, the '951 has a ring groove at the front of the lid for the buckle to snap into, and another ring groove near the upper edge of the receiving portion for the buckle to snap into. Therefore, force must be applied to force the buckle to snap into the ring grooves at different positions. Therefore, the assembly difficulty is increased and the assembly speed is slowed down.

Furthermore, when the '951 buckle ring snaps the cover into the annular groove of the main body to limit the ratchet body in the receiving portion, if the coordination between the ratchet body and the actuator is found to be problematic and parts need to be replaced, the buckle ring cannot be removed to replace the parts. Usually, the entire body, ratchet body and actuator can only be scrapped together. The increase in scrapped parts will increase the variable cost and the manufacturing cost.

In addition, the ’951 ratchet wrenches only indicate the size by printing, laser or embossing. However, since there are many similar sizes between metric and imperial specifications, users still have to spend time to first identify whether it is metric or imperial, and then identify the required size. Therefore, it takes more time to find the ratchet wrench of the required specifications and size each time.

The purpose of the present invention is to provide a ratchet wrench to solve the difficulties mentioned in the above-mentioned prior art.

According to an embodiment of the present invention, a ratchet wrench is provided, comprising: a body, the body having a force arm and a working head connected to each other, the working head forming a first through hole, the two end hole walls of the first through hole are each surrounded by a first recess, the two first recesses are spaced apart from each other, the two side hole walls of the two first recesses each form a first stopper, the first through hole is formed with a receiving groove toward the side wall, the receiving groove is formed from the working head toward the force arm, The lever arm is concavely formed, and the receiving groove is located on the side wall between the two first concave parts; an elastic member, which is received in the receiving groove; a detent member, which is received in the receiving groove, and a plurality of first teeth are formed on the side wall of the detent member; a driving member, which is received in the first through hole, and one end of the driving member is assembled on the first through hole, and a plurality of second teeth are arranged around the outer wall of the driving member, and a first tooth is arranged around the outer wall of the two ends of the driving member. The elastic member elastically abuts against the detent member, the first teeth of the detent member are engaged with the second teeth of the driving member, the driving member is formed with a sleeve portion, and the sleeve portion penetrates the driving member; and two positioning members, the two positioning members are injection-molded with plastic material, the two positioning members are formed with a second through hole, and the two positioning members are formed with the second through hole. Each of the two positioning members is assembled on the second concave portion and the third concave portion of the driving member. The outer wall of each of the two positioning members is surrounded by a second convex portion having a plurality of convex ribs. The convex ribs are arranged at intervals. Each of the two positioning members is assembled on the two first concave portions of the working head with the second convex portion. Each of the two positioning members is formed with a second stopper on the outer wall of the two sides of the second convex portion. The first stopper of the working head and the second stopper of the two positioning members are against each other.

Thus, through the structures described in the above embodiments, the present invention provides a low-cost, easy-to-assemble ratchet wrench. The present invention further provides a ratchet wrench that reduces manufacturing costs, reduces assembly difficulty, speeds up assembly, is simple to maintain, and is easy to replace.

The above is only used to explain the problems that the present invention intends to solve, the technical means for solving the problems, and the effects produced, etc. The specific details of the present invention will be introduced in detail in the following implementation method and related drawings.

In order to give the Honorable Review Committee a further understanding of the present invention, a preferred embodiment is given with accompanying drawings and described in detail as follows: Please refer to Figures 1 and 2. The present invention provides a ratchet wrench 10 including a body 20, an elastic member 30, a detent member 40, a drive member 50 and a positioning member 60, wherein: The body 20 has a force application arm 21 and a working head 22 connected to each other. When the force application arm 21 is subjected to force, the working head 22 moves accordingly. The working head 22 is formed with an axially extending first through hole 23. The hole wall at one axial end of the first through hole 23 is radially provided with a first protrusion 231.

Furthermore, the hole wall at the other axial end of the first through hole 23 is radially provided with a first concave portion 232, the first convex portion 231 and the first concave portion 232 are spaced apart from each other, and the hole walls on both sides of the first concave portion 232 are respectively formed with a first blocking portion 233. In the present invention, only the first concave portion 232 is processed by computer numerical control (CNC).

Furthermore, the first through hole 23 has an arc-shaped receiving groove 234 radially concavely disposed on the side wall between the two ends, and the receiving groove 234 is formed by the working head 22 concavely toward the force arm 21. Moreover, the receiving groove 234 is located on the side wall between the first protrusion 231 and the first concave portion 232.

The elastic member 30 is a spring (please refer to Figures 2, 3, and 4) or a spring sheet (not shown, the whole is bent into a U-shape or a C-shape), and the elastic member 30 is accommodated in the accommodation groove 234.

The detent member 40 (see Figures 2, 3, and 4) has an arc-shaped contour corresponding to the shape of the receiving groove 234, so that the detent member 40 is received in the receiving groove 234, with one convex side wall being elastically resisted by the elastic member 30, and the other concave side wall opposite to the detent member 40 is formed with a plurality of first teeth 41.

The driving member 50 (please refer to Figures 2, 3, and 4) is a hollow cylinder. The outer diameter of the driving member 50 is smaller than the inner diameter of the first through hole 23, so that the driving member 50 can be accommodated in the first through hole 23. One end of the driving member 50 is assembled on the first through hole 23, and one end of the driving member 50 is further assembled on the first protrusion 231. An axially extending sleeve portion 51 is formed at the center of the driving member 50. The sleeve portion 51 penetrates the driving member 50. The sleeve portion 51 can be a round hole, a square hole, a hexagonal hole, or a plum blossom hole. The outer wall between the two ends of the driving member 50 is ringed with a plurality of second teeth 52.

Furthermore, the outer wall of the two axial ends of the driving member 50 is radially provided with a second and a third concave portion 53, 54, so that the second tooth portion 52 is located between the second and the third concave portions 53, 54. The driving member 50 is assembled with the third concave portion 54 at one end thereof facing the first convex portion 231 of the working head 22, and the elastic member 30 uses its own elastic force to elastically press against the convex side wall of the detent member 40, so that the first tooth portion 41 of the concave side wall of the detent member 40 is engaged with the second tooth portion 52 of the driving member 50. In addition, the depth of the second concave portion 53 is greater than that of the third concave portion 54, because the second concave portion 53 must reserve space for accommodating the positioning member 60. Depth refers to radial depth and axial depth. The third concave portion 54 and the first convex portion 231 structures can be interchangeable and are not limited to concave or convex structures.

Furthermore, for the purpose of stable operation, the elastic member 30 can be matched with a blind hole (not shown). One is to form a blind hole (not shown) on the wall of the receiving groove 234 to accommodate one end of the elastic member 30, and the other end elastically abuts against the convex side wall of the detent member 40. The other is to form a blind hole (not shown) on the convex side wall of the detent member 40 to accommodate one end of the elastic member 30, and the other end elastically abuts against the wall of the receiving groove 234.

The positioning member 60 is made of plastic injection molding. The positioning member 60 (please refer to Figures 2, 3, 4, and 5) is a hollow ring. The positioning member 60 is formed with a second through hole 61 extending axially. The outer wall between the two axial ends of the positioning member 60 is radially provided with a second protrusion 62. Moreover, the second protrusion 62 has a plurality of ribs, which are arranged at intervals. The outer walls on both sides of the second protrusion 62 are respectively formed with a second stop 63.

Please refer to Figures 4, 6, and 7. External force is applied to the positioning member 60 so that the positioning member 60 is assembled on the second recess 53 at the other end of the driving member 50 with the second through hole 61. The positioning member 60 is deformed by the external force, so that the second protrusion 62 of the positioning member 60 is assembled relative to the first recess 232 of the working head 22, and the first stop 233 of the working head 22 and the second stop 63 of the positioning member 60 abut against each other, so that the positioning member 60 and the working head 22 are stably assembled. The second protrusion 62 and the first recess 232 structures can be replaced with each other, and are not limited to concave and convex structures.

The positioning member 60 further has a molding color for identification, and the execution step of the molding color further includes: before injection molding, the positioning member 60 selects a target color corresponding to the specification of the ratchet wrench 10. For example, if the specification is imperial or metric, the positioning member 60 of the ratchet wrench 10 of imperial specification is marked in red, and the positioning member 60 of the ratchet wrench 10 of metric specification is marked in blue.

During the injection molding, the positioning member 60 performs a plastic dyeing according to the selected target color. The plastic dyeing is color powder dyeing, color material dyeing, full material dyeing or full particle dyeing.

After the positioning part 60 is injection molded, the positioning part 60 has a molding color, and the molding color is adjusted by plastic dyeing to correspond to the target color selected before the plastic injection molding.

When the operator wants to select a ratchet wrench 10 of appropriate specifications, the color of the positioning member 60 can help the operator quickly identify the specifications. For example, when a metric ratchet wrench 10 uses a blue positioning member 60, the operator can distinguish the metric ratchet wrench 10 by the color of the positioning member 60, and then select the correct size to be used. The color-assisted identification and specific size selection can increase the speed of the operator selecting the ratchet wrench 10 specifications. Therefore, the color of the positioning member 60 can help identify the specifications, so that the operator can quickly select the ratchet wrench 10 of appropriate specifications, which is more convenient to operate, saves more time, and improves efficiency.

The present invention provides another ratchet wrench 10 (not shown), the difference is that a positioning member 60 is assembled at each end of the driving member 50, and the body 20 will not use the first protrusion 231, but two first recesses 232, so that the hole walls at the two axial ends of the first through hole 23 of the body 20 are respectively provided with first recesses 232 in a radial direction, and the two first recesses 232 are spaced apart from each other, and each first recess 232 is respectively formed with a first stopper 233 on both sides of the hole wall. The driving member 50 must also be adjusted in response to the change of the body 20, so that the second recess 53 and the third recess 54 at the two ends of the driving member 50 have the same depth, so that there is space at the two ends of the driving member 50 to accommodate the two positioning members 60. The number of positioning members 60 is only two, and the structural composition is the same, so it will not be repeated. The assembly method of the main body 20, the driving member 50 and the positioning member 60 is the same, so it will not be repeated.

In summary, the present invention provides a ratchet wrench 10, wherein the positioning member 60 adopts an integrally-injected second protrusion 62, and the working head 22 of the body 20 only needs to adopt a high-cost computer numerical control (CNC) to process the first concave portion 232, and the second protrusion 62 and the first concave portion 232 are arranged opposite to each other, so that the positioning member 60 positions the driving member 50 on the working head 22 of the body 20. Therefore, in addition to reducing the manufacturing cost, the production capacity utilization rate is also greatly improved.

Furthermore, the present invention provides a ratchet wrench 10, wherein the positioning member 60 is formed by injection molding of a plastic material, and the second protrusion 62 formed by integral injection molding is assembled with the first concave portion 232. After the elastic member 30, the detent member 40, and the drive member 50 are assembled to the body 20 in sequence, the positioning member 60 made of the plastic material is deformed by applying force, so that each part can be positioned on the working head 22 of the body 20, and the positioning is performed at one time. Therefore, the difficulty of assembly is reduced and the assembly speed is accelerated.

Furthermore, the present invention provides a ratchet wrench 10, wherein the positioning member 60 is injection molded with a plastic material. When the positioning member 60 positions each part on the working head 22 of the body 20, if there is a problem in the cooperation between the detent member 40 and the drive member 50 and the parts need to be replaced, the positioning member 60 can be forced out in a reverse manner by destruction, and the positioning member 60 can be smoothly taken out to replace the parts without having to scrap the body 20, the detent member 40, and the drive member 50. The reduction of scrapped parts will reduce the change cost, and the manufacturing cost will also be reduced accordingly.

In addition, the present invention provides a ratchet wrench 10, in which the positioning member 60 is injection molded with a plastic material. The color of the positioning member 60 can be adjusted by dyeing during the process, so that the positioning member 60 has at least one color. The specification can be instantly identified by the color of the positioning member 60, so that the operator can quickly select the ratchet wrench 10. Therefore, it is more convenient to operate, saves more time, and improves efficiency.

Finally, the embodiments disclosed above are not intended to limit the present invention. Anyone skilled in the art can make various changes and modifications within the spirit and scope of the present invention, and all of them can be protected by the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of the patent application attached hereto.

[The present invention]

10: Ratchet wrench

20: Body

21: Force arm

22: Working head

23: First piercing

231: First convex part

232: First concave part

233: First barrier

234: Storage tank

30: Elastic parts

40: brake piece

41: First tooth

50:Driver

51: Fitting part

52: Second tooth

53: Second concave portion

54: The third concave portion

60: Positioning piece

61: Second piercing

62: Second convex part

63: Second stopper

Figure 1: A three-dimensional schematic diagram of the ratchet wrench of the present invention.

Figure 2: Schematic diagram of the disassembled ratchet wrench of the present invention.

Figure 3: Side view and partial cross-sectional diagram of the ratchet wrench of the present invention.

Figure 4: A partial enlarged schematic diagram of Figure 3 of the ratchet wrench of the present invention.

Figure 5: A top view and partial cross-sectional view of the ratchet wrench of the present invention.

Figure 6: A partial enlargement of Figure 4 of the ratchet wrench of the present invention and a schematic diagram of the first combination.

Figure 7: A partial enlargement of Figure 4 of the ratchet wrench of the present invention and a schematic diagram of the second combination.

20: Body

21: Force arm

22: Working head

23: First piercing

231: First convex part

232: First concave part

233: First barrier

234: Storage tank

30: Elastic parts

40: brake piece

41: First tooth

50:Driver

51: Fitting part

52: Second tooth

53: Second concave portion

54: The third concave portion

60: Positioning piece

61: Second piercing

62: Second convex part

63: Second stopper

Claims (5)

A ratchet wrench comprises: a body, the body having a force arm and a working head connected to each other, the working head forming a first through hole, the two end hole walls of the first through hole are respectively surrounded by a first recess, the two first recesses are spaced apart from each other by a distance, the two side hole walls of the two first recesses are respectively formed with a first stopper, the first through hole is formed with a receiving groove toward the side wall, the receiving groove is formed from the working head toward the force arm, the receiving groove is formed The receiving groove is located on the side wall between the two first recesses; an elastic member, which is accommodated in the receiving groove; a detent member, which is accommodated in the receiving groove, and a plurality of first teeth are formed on the side wall of the detent member; a driving member, which is accommodated in the first through hole, one end of the driving member is assembled on the first through hole, a plurality of second teeth are arranged around the outer wall of the driving member, and a second recess and a first tooth are arranged around the outer wall of the two ends of the driving member. The elastic member elastically abuts against the detent member, the first teeth of the detent member are engaged with the second teeth of the driving member, the driving member is formed with a sleeve portion, and the sleeve portion penetrates the driving member; and two positioning members, the two positioning members are injection-molded with plastic material, the two positioning members are formed with a second through hole, and the two positioning members are respectively formed with the second through hole. The second recess and the third recess of the driving member are arranged on the outer wall of each of the two positioning members, and a second protrusion is arranged around the outer wall of each of the two positioning members, and has a plurality of ribs, and the ribs are arranged at intervals. Each of the two positioning members is assembled on the two first recesses of the working head with the second protrusion, and each of the two positioning members is formed with a second stopper on the outer wall of the two sides of the second protrusion. The first stopper of the working head and the second stopper of the two positioning members are against each other. A ratchet wrench as described in claim 1, wherein the wall of the receiving groove is formed with a blind hole, the blind hole is used to accommodate one end of the elastic member, and the other end of the elastic member elastically abuts against the side wall of the detent member. A ratchet wrench as described in claim 1, wherein a blind hole is formed on the side wall of the detent member, the blind hole is used to accommodate one end of the elastic member, and the other end of the elastic member elastically abuts against the wall of the accommodating groove. A ratchet wrench as described in claim 1, wherein the positioning member further has a molding color, and the molding color is implemented in the following steps: before injection molding, the positioning member selects a target color corresponding to the specification of the ratchet wrench; during injection molding, the positioning member performs a plastic dyeing according to the selected target color; and after injection molding, the positioning member has the molding color, and the molding color is adjusted by the plastic dyeing corresponding to the target color selected before plastic injection molding. A ratchet wrench as described in claim 4, wherein the plastic dyeing is powder dyeing, colorant dyeing, full-drawn dyeing or full-drawn granule dyeing.

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