Double-tooth type one-way ratchet wrench structure

Abstract

A double-tooth type one-way ratchet wrench structure comprises a wrench body, a braking unit and a ratchet, the braking unit is provided with a first tooth manufacturing piece and a second tooth manufacturing piece which are combined side by side, and the starting end positions of tooth sections of the first tooth manufacturing piece and the second tooth manufacturing piece are different and have the distance of at least half teeth. One of the first tooth manufacturing piece and the second tooth manufacturing piece is kept in a state of being meshed with the ratchet wheel, a matched convex column and a matched groove are arranged on the surface, close to each other, of the first tooth manufacturing piece and the surface, close to each other, of the second tooth manufacturing piece respectively, and the first tooth manufacturing piece and the second tooth manufacturing piece are rapidly and accurately assembled and combined through the matched convex columns and the matched grooves. The combined fool-proof effect is achieved, the situation that the small-angle tooth changing driving effect is lost due to the fact that two tooth manufacturing pieces with the same tooth pitch are used in a combined mode is avoided, and the using accuracy and stability of the structural composition are improved.

Description

Technical Field

[0001] The invention relates to a ratchet wrench, in particular to a double-toothed one-way ratchet wrench structure. Background Art

[0002] Ratchet wrenches are a common, technically sophisticated hand tool found in almost every household. They utilize the position of the ratchet block to change the direction of the ratchet's driving or idling action. However, to achieve rapid steering engagement, common ratchet wrenches typically have 72 teeth, each with a 5° rotation angle. This creates manufacturing difficulties, increasing production costs and quality defects. Furthermore, the relatively small tooth profile of the ratchet ring prevents reliable engagement with the tooth block, leading to slippage and potentially insufficient torque for the ratchet wrench and damage to the tooth block.

[0003] Therefore, in order to improve the above-mentioned shortcomings of the existing one-way wrenches, relevant wrench manufacturers have developed a one-way ratchet wrench structure, such as the "one-way wrench with a double-pawl single-pawl seat detent device with differential teeth" with patent announcement No. I510334. The wrench has a body, a driving member, and a detent device. The detent device has two detents, two reset members and a detent seat, wherein one end of the body has a driving hole, and the side of the driving hole is provided with mutually connected detent grooves, and the detent groove is shallow at both ends and deep in the middle; the driving member has ratchet teeth on the outside and a penetrating driving hole on the inside; the two The pawl has a supporting end that presses against the pawl groove, and has a tooth portion relative to the end face of the ratchet. The tooth portion of one of the two pawls is in the form of a tooth valley at the starting end, while the tooth portion of the other pawl is in the form of a tooth peak at the starting end. The teeth of the two pawls differ by half a tooth and maintain a form in which only one pawl is engaged and driven by the ratchet of the driving member; one end of the two reset members is respectively pressed against the two pawls, and the other ends of the two reset members are pressed against the pawl seat; the pawl seat has a supporting surface that presses against the pawl groove, and is pressed by the two reset members relative to the end face of the pawl, and the other ends of the two reset members press against the pawl.

[0004] A detailed look at the above-mentioned existing structure reveals that it still has some shortcomings, the main reasons being as follows: First, the two existing pawls use a half-tooth difference in the teeth to ensure that only one pawl is engaged with the ratchet of the driving member. However, since the pawl component design itself is small in size and the half-tooth difference in the teeth is difficult to detect by visual inspection, when assembling the one-way wrench, it is easy to assemble and use the two pawls with no half-tooth difference in the teeth, thereby losing the effect of small-angle tooth change drive, lacking the accuracy of structural assembly, and reducing the stability of product manufacturing.

[0005] Secondly, since the two pawls are simply assembled side by side into the detent groove, although the teeth of the two pawls differ by half a tooth, there is obviously no mutual restriction or matching design between the two pawls. Under the idle rotation of the ratchet, the displacement and jump between the two pawls are difficult to control. It is difficult to say that the two pawls will definitely jump to each other and have the effect of small-angle tooth change, and the structural operation lacks stability.

[0006] Third, the two existing latches are supported by two reset members via a latch seat. In the relatively small space of the latch groove, it is obviously difficult to assemble the latch, the two reset members and the latch seat into the latch groove. In particular, the reset member is a spring. During assembly, the elastic expansion of the spring may easily cause the latch to bounce off or even be lost, which increases the inconvenience of structural assembly and lacks assembly efficiency. In addition, the angle error between the two latches and the latch seat may cause the reset member to be unable to elastically expand and contract linearly, thereby affecting the tooth cooperation of the ratchet.

[0007] In view of this, the inventor, with many years of experience in manufacturing, developing and designing related products, has, after detailed design and careful evaluation aimed at the above-mentioned goals, finally arrived at a truly practical present invention. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a double-toothed one-way ratchet wrench structure with a combined fool-proof effect and stable small-angle gear change drive in response to the above-mentioned deficiencies in the prior art.

[0009] In order to achieve the above-mentioned purpose, the present invention provides a double-toothed one-way ratchet wrench structure, comprising: a wrench body, the wrench body having a driving space, a brake groove connected to the driving space on one side, and the brake groove being arc-shaped; a brake unit, having a first toothed member and a second toothed member combined side by side, and two spring members accommodated in the brake groove, the spring members abutting one end of the brake groove, and the first and second toothed members have an abutting end abutting against the other end of the brake groove, one end face of the first and second toothed members is concave arc-shaped and both form a tooth segment and an arc surface segment, wherein the starting end positions of the tooth segments of the first and second toothed members are different and have a distance of at least half a tooth, so that the tooth segments are aligned and abutted when the front ends of the first and second toothed members are aligned. The teeth are arranged in a staggered manner, and the tooth segments are sequentially provided with a plurality of equiangular teeth and a heteroangular tooth adjacent to the arc surface segment. The surfaces of the first and second toothed parts that are adjacent to each other are both provided with a mating protrusion and a mating groove, and the first and second toothed parts are quickly and accurately assembled and combined through the mating protrusion and the mating groove. The space of the mating groove is larger than the volume of the mating protrusion, further providing a clearance effect of mutual displacement between the first and second toothed parts; a ratchet, the outer periphery of the ratchet is provided with a plurality of equiangular teeth, the inner diameter edge is provided with a driving hole, and one end of the ratchet is provided with a buckle ring groove, and a C-shaped buckle is used to buckle the ratchet to fix it in the driving space, so that the equiangular teeth on the outer periphery of the ratchet are meshed and linked with one of the tooth segments of the first and second toothed parts.

[0010] Preferably, the tooth tip angle of the hetero-angle teeth of the tooth segment is greater than the tooth tip angle of the equi-angle teeth, and the tooth tip height of the hetero-angle teeth is lower than the tooth tip height of the equi-angle teeth.

[0011] Preferably, the arc surface segment and the tooth segment are not formed with the same center, and the arc surface segment is lower than the tooth segment.

[0012] Preferably, the first and second tooth-making members have a combined groove at the lower end of the arc surface segment, a hook rib portion extends from the lower edge of the combined groove, and a convex rib opposite to the hook rib portion is provided on the upper surface of the combined groove, the hook rib portion and the convex rib fix one end of the spring member, further restricting the spring member in the combined groove.

[0013] Compared with the efficacy of previous technologies:

[0014] (1) The surfaces of the first and second toothed parts against each other are provided with matching engaging protrusions and matching grooves, so that when the brake unit is assembled, the first and second toothed parts with a half-tooth distance difference can be clearly assembled and combined through the matching engaging protrusions and matching grooves, which has a combination anti-mistake effect, avoids the loss of small-angle gear-changing driving effect by assembling two toothed parts with the same tooth pitch, improves the accuracy of the structural assembly and reduces the yield problem caused by human factors.

[0015] (2) The engaging groove space of the first and second toothed members is larger than the volume of the engaging protrusion, so that when the first and second toothed members are displaced relative to each other, the engaging groove can be used to limit the displacement range of the engaging protrusion, thereby limiting the displaced state between the first and second toothed members, which helps to improve the stability of the brake unit in driving the ratchet at a small angle.

[0016] (3) The first and second toothed members of the brake unit both have tooth segments and arcuate segments, and the spring member is fixed by a combination groove at the bottom of the arcuate segment, effectively reducing the volume and components of the brake unit so that it can be installed in the brake groove in a relatively simple manner, and the other end of the spring member can directly abut against the inner wall of the brake groove to achieve a linear compression and extension effect, thereby improving the actuation accuracy of the first and second toothed members, thereby effectively achieving the purpose of small-angle tooth change drive. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a perspective view of the present invention.

[0018] Figure 2 It is an exploded view of the present invention.

[0019] Figure 3 2 is a cross-sectional view of the first and second tooth-making members of the present invention.

[0020] Figure 4 It is a schematic diagram of the first and second tooth-making members of the present invention being assembled and coupled.

[0021] Figure 5 Schematic diagram of the displacement of the first and second tooth-making members of the present invention.

[0022] Figure 6 It is a schematic diagram of the first toothed member of the present invention meshing with the ratchet wheel to perform a locking operation.

[0023] Figure 7 This is a schematic diagram of the idling state in which the first toothed member is engaged with the ratchet and the second toothed member is disengaged from the ratchet according to the present invention.

[0024] Figure 8 This is a schematic diagram of the idling state in which the second toothed member is engaged with the ratchet and the first toothed member is disengaged from the ratchet according to the present invention.

[0025] Figure 9 FIG. 4 is a schematic diagram of the second toothed member of the present invention meshing with the ratchet wheel to perform a locking operation.

[0026] Explanation of symbols:

[0027] [The present invention]

[0028] 10: Wrench body

[0029] 11: Driving Space

[0030] 12: Brake groove

[0031] 20: Braking unit

[0032] 21: First toothed member

[0033] 211: abutment end

[0034] 212: Tooth segment

[0035] 2121: Equal angle teeth

[0036] 2122: Hetero-angle teeth

[0037] 213: arc segment

[0038] 214: Fitting the boss

[0039] 215: Fitting groove

[0040] 216: Combination Slot

[0041] 217:Hook ribs

[0042] 218: ribs

[0043] 22: Second toothed member

[0044] 221: abutment end

[0045] 222: Tooth segment

[0046] 2221: Equal angle teeth

[0047] 2222: Hetero-angle teeth

[0048] 223: arc segment

[0049] 224: Fitting the boss

[0050] 225: Fitting groove

[0051] 226: Combination Slot

[0052] 227:Hook ribs

[0053] 228: ribs

[0054] 23: Spring

[0055] 30: Ratchet

[0056] 31: Equiangular teeth

[0057] 32: Drive hole

[0058] 33: snap ring groove

[0059] 34: C-shaped buckle DETAILED DESCRIPTION

[0060] To further understand and appreciate the purpose, features and effects of the present invention, please refer to the following [Brief Description of the Figures] for details:

[0061] First, please Figure 1 、 23, a double-toothed one-way ratchet wrench structure, comprising: a wrench body 10, a brake unit 20 and a ratchet 30, the wrench body 10 having a driving space 11, a brake groove 12 connected to one side of the driving space 11, the brake groove 12 is arc-shaped; the brake unit 20 has a first toothed member 21 and a second toothed member 22 that are combined side by side, and two spring members 23 are accommodated in the brake groove 12, the spring member 23 abuts against one end of the brake groove 12, and the first and second toothed members 21, 22 have abutting ends 211, 221 that abut against the other end of the brake groove 12, the first and second toothed members 21, 22 One end surface of the tooth segment 212, 222 is concavely arcuate and is formed with a tooth segment 212, 222 and a curved surface segment 213, 223. The curved surface segment 213, 223 and the tooth segment 212, 222 are not formed with the same center of the arc, and the curved surface segment 213, 223 is lower than the tooth segment 212, 222. The starting end positions of the tooth segments 212, 222 of the first and second toothed parts 21, 22 are different and have a distance of at least half a tooth, so that the tooth segments 212, 222 are staggered when the front ends of the first and second toothed parts 21, 22 are aligned and close to each other. The tooth segments 212, 222 are sequentially provided with a plurality of equiangular teeth 2121, 2221 and adjacent to the curved surface segment 21 3, 223 of the tooth 2122, 2222, the tooth top angle of the tooth 2122, 2222 is greater than the tooth top angle of the equal-angle teeth 2121, 2221, and the tooth top height of the tooth 2122, 2222 is lower than the tooth top height of the equal-angle teeth 2121, 2221, and the first and second tooth-making parts 21, 22 are provided with a matching protrusion 214, 224 and a matching groove 215, 225 on the surface where the first and second tooth-making parts 21, 22 are side by side, and the first and second tooth-making parts 21, 22 are quickly and accurately combined by the matching protrusion 214, 224 and the matching groove 215, 225, and the space of the matching groove 215, 225 is greater than The volume of the engaging protrusions 214, 224 further provides a clearance effect for mutual displacement between the first and second toothed members 21, 22. The first and second toothed members 21, 22 each have a combined groove 216, 226 at the lower end of the arcuate surface segments 213, 223. A hook rib 217, 227 extends from the lower edge of the combined groove 216, 226. A convex rib 218, 228 is provided on the upper surface of the combined groove 216, 226 opposite to the hook rib 217, 227. The hook rib 217, 227 and the convex rib 218, 228 fix one end of the spring member 23, further confining the spring member 23 in the combined groove 216, 226.The ratchet wheel 30 is provided with a plurality of equiangular teeth 31 on its outer periphery and a drive hole 32 on its inner diameter. A snap ring groove 33 is provided at one end of the ratchet wheel 30. A C-shaped buckle 34 is used to snap the ratchet wheel 30 into the drive space 11, allowing the equiangular teeth 31 on the outer periphery of the ratchet wheel 30 to mesh with the tooth segments 212 and 222 of the first and second toothed members 21 and 22, respectively.

[0062] The composition of its structure, please Figure 1 、 2 , 3, 4, and 6, the brake groove 12 of the wrench body 10 accommodates the brake unit 20, and the ratchet 30 is installed by the driving space 11, and then the ratchet 30 is restricted to the driving space 11 by the C-shaped buckle 34, wherein the first and second toothed members 21 and 22 of the brake unit 20 press one end of the spring member 23 in the combined groove 216 and 226 against one end of the brake groove 12, and the abutting portion 211 and 221 of the other end of the first and second toothed members 21 and 22 press against the other end of the brake groove 12, and the spring member 23 is used to generate elastic force to press the tooth segments of the first and second toothed members 21 and 22. The tooth segments 212 and 222 of the first and second toothed members 21 and 22 are interlaced with each other, so that one of the tooth segments 212 and 222 of the first and second toothed members 21 and 22 is kept in meshing and linked state with the equiangular teeth 31 of the ratchet 30. Moreover, the angular teeth 2122 and 2222 formed by the last teeth of the tooth segments 212 and 222 are lower than the other equiangular teeth 2121 and 2221, so that the angular teeth 2122 and 2222 are not fully meshed with the equiangular teeth 31, thereby creating a slip space, thereby completing the one-way ratchet wrench structure.

[0063] The actual use of the structure is as follows Figure 6 As shown, the wrench body 10 is nested on the workpiece nut with the ratchet 30 in the driving space 11, and a force is applied to twist the workpiece nut to achieve the locking or loosening operation. When the user holds the wrench body 10 and twists it clockwise to lock the workpiece nut, the ratchet 30 will generate a counterclockwise reaction force. However, because the spring member 26 is relatively located on the clockwise rotation side of the first and second toothed members 21 and 22, when the ratchet 30 rotates counterclockwise, the first and second toothed members 21 and 22 are pushed upward by the spring member 23, and do not simultaneously clamp the equiangular teeth 21 of the ratchet 30, so that the first and second toothed members 21 and 22 are mutually clamped and meshed with the equiangular teeth 31 of the ratchet 30. Figure 6 The first toothed member 21 is in meshing engagement with the ratchet 30 , thereby increasing the number of teeth and enabling the workpiece to be driven by changing teeth at a small angle. The ratchet 30 then rotates clockwise along with the wrench body 10 to tighten the nut on the workpiece.

[0064] On the contrary, when the wrench body 10 is twisted counterclockwise, Figure 4 、 7 As shown in FIG8 , since the ratchet 30 is sleeved on the workpiece nut and has a limited position, a clockwise rotation reaction force is generated, which links the first and second toothed members 21 and 22 to rotate clockwise and compress the spring member 23. At this time, the first and second toothed members 21 and 22 will first quickly disengage from the equiangular teeth 31 through the preset slipping space of the angular teeth 2122 and 2222, thereby achieving a non-meshing state between the first and second toothed members 21 and 22 and the ratchet 30. Then, through the clearance fit between the engaging protrusions 214 and 224 and the engaging grooves 215 and 225, the first and second toothed members 21 and 22 are restrained from each other when they are displaced, limiting the displacement effect of the first and second toothed members 21 and 22 to only half a tooth distance, thereby achieving the purpose of mutual engagement and disengagement between the first and second toothed members 21 and 22 and the equiangular teeth 31 of the ratchet 30. Figure 7 The first toothed member 21 is engaged and the second toothed member 22 is disengaged. Figure 8 The second toothed member 22 is engaged and the first toothed member 21 is disengaged, thereby idling the ratchet 30 in the driving space 11 to provide the wrench body 10 with a torsion reset, and then perform a clockwise torsion force locking operation.

[0065] Furthermore, when the wrench body 10 is twisted back to its original position and then twisted clockwise to apply force, Figure 9 As shown, the ratchet 30 generates a counterclockwise rotation reaction force, causing the first and second toothed members 21 and 22 to lose their clockwise rotation force and allowing the spring member 23 to rebound and reset, thereby quickly engaging the tooth segments 212 and 222 of the first and second toothed members 21 and 22 with the equiangular teeth 31 of the ratchet 30. Figure 9 The second toothed member 22 is in meshing engagement with the ratchet 30. The clearance between the engaging protrusions 214, 224 and the engaging recesses 215, 225 allows the first and second toothed members 21, 22 to shift and restrain each other, limiting the displacement of the first and second toothed members 21, 22. This ensures that the ratchet 30 is engaged at a small angle, and the workpiece nut is tightened as the wrench body 10 rotates clockwise.

[0066] In addition, when the first and second toothed members 21 and 22 are compressed by the spring member 23 due to the counterclockwise rotation of the wrench body 10 to form a released state, since the arcuate segments 213 and 223 of the first and second toothed members 21 and 22 are lower than the tooth segments 212 and 222, the arcuate segments 213 and 223 of the first and second toothed members 21 and 22 will be closer to the equal-angle teeth 31, thereby reducing the space between the ends of the arcuate segments 213 and 223 of the first and second toothed members 21 and 22 and the inner wall of the brake groove 12, so that the spring member 23 can be reliably confined in the combined grooves 216 and 226, effectively preventing the spring member 23 from slipping and popping out.

[0067] The following benefits can be obtained through the structure of the above specific embodiment:

[0068] (1) The surfaces of the first and second toothed members 21 and 22 that are adjacent to each other are provided with matching engaging protrusions 214 and 224 and matching grooves 215 and 225, so that when the brake unit 20 is assembled, the first and second toothed members 21 and 22 that are separated by a half-tooth distance can be clearly assembled and combined through the matching engaging protrusions 214 and 224 and the matching grooves 215 and 225, which has a combination fool-proof effect, avoids the loss of small-angle gear-changing driving effect by assembling two toothed members with the same tooth pitch, improves the accuracy of the structural assembly and reduces the yield problem caused by human factors.

[0069] (2) The space of the engaging grooves 215 and 225 of the first and second toothed members 21 and 22 is larger than the volume of the engaging protrusions 214 and 224. When the first and second toothed members 21 and 22 are displaced relative to each other, the engaging grooves 215 and 225 can be used to limit the displacement range of the engaging protrusions 214 and 224, thereby limiting the displaced state between the first and second toothed members 21 and 22, which helps to improve the stability of the brake unit 20 in driving the ratchet 30 at a small angle.

[0070] (3) The first and second toothed members 21 and 22 of the brake unit 20 both have tooth segments 212 and 222 and arcuate segments 213 and 223, and the spring member 23 is fixed by the combination grooves 216 and 226 at the bottom of the arcuate segments 213 and 223, thereby effectively reducing the volume and components of the brake unit 20 so that it can be installed in the brake groove 12 in a relatively simple manner. The other end of the spring member 23 can directly abut the inner wall of the brake groove 12 to achieve a linear compression and extension effect, thereby improving the actuation accuracy of the first and second toothed members 21 and 22, thereby effectively achieving the purpose of small-angle gear change drive.

[0071] The above description is only a preferred embodiment of the present invention and should not be used to limit the scope of implementation of the present invention; that is, all equivalent changes and modifications made according to the scope of the patent application of the present invention should still fall within the scope of the patent of the present invention.

Claims

1. A double-tooth one-way ratchet wrench structure, characterized in that: include: A wrench body having a driving space, a brake groove communicating with the driving space is provided on one side of the driving space, and the brake groove is in an arc shape; A braking unit comprises a first toothed member and a second toothed member which are combined side by side, and two spring members are arranged in the braking groove, wherein the spring member abuts against one end of the braking groove, and the first and second toothed members have an abutting end abutting against the other end of the braking groove, and one end surface of the first and second toothed members is concave arc-shaped and both form a tooth segment and an arc surface segment, wherein the starting end positions of the tooth segments of the first and second toothed members are different by a distance of at least half a tooth, so that the tooth segment is at the first end. The front ends of the first and second toothed members are staggered when aligned and abutted against each other, and the tooth segments are sequentially provided with a plurality of equiangular teeth and a heteroangular tooth adjacent to the arc surface segment. The surfaces of the first and second toothed members that abut against each other are both provided with a mating protrusion and a mating groove, and the first and second toothed members are quickly and accurately assembled and abutted against each other through the mating protrusion and the mating groove. The space of the mating groove is larger than the volume of the mating protrusion, further providing a clearance effect of mutual displacement between the first and second toothed members; A ratchet wheel has a plurality of equiangular teeth on its outer periphery and a drive hole on its inner diameter. A snap ring groove is provided at one end of the ratchet wheel, and a C-shaped buckle is used to snap the ratchet wheel into the drive space, so that the equiangular teeth on the outer periphery of the ratchet wheel mesh with one of the tooth segments of the first and second toothed members.

2. The double-toothed one-way ratchet wrench structure according to claim 1, characterized in that: The tooth tip angle of the hetero-angle teeth of the tooth segment is greater than the tooth tip angle of the equi-angle teeth, and the tooth tip height of the hetero-angle teeth is lower than the tooth tip height of the equi-angle teeth.

3. The double-toothed one-way ratchet wrench structure according to claim 1, characterized in that: The arc surface segment and the tooth segment are not formed with the same arc center, and the arc surface segment is lower than the tooth segment.

4. The double-tooth one-way ratchet wrench structure according to claim 1, characterized in that: The first and second tooth-making members have a combined groove at the lower end of the arc surface segment, a hook rib portion extends from the lower edge of the combined groove, and a convex rib opposite to the hook rib portion is provided on the upper surface of the combined groove. The hook rib portion and the convex rib fix one end of the spring member, further restricting the spring member in the combined groove.

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