CN109079690B - Ratchet wrench - Google Patents

Abstract

A ratchet wrench comprises a body, a ratchet, two clamping blocks and a switching unit. The body includes a head having a pocket. The ratchet wheel can be pivotally arranged in the containing groove. The clamping block is pivoted on the containing groove. The switching unit comprises a switching piece, a sliding groove and a stop block. The switching piece can be operated to push the clamping block to enable the clamping block to be meshed with the ratchet wheel alternatively. The sliding groove is arranged on one of the head part and the switching part. The stop block is arranged on the other one of the head part and the switching piece and protrudes into the sliding groove. The sliding groove and the stopping block can limit the rotating range of the switching piece, excessive rotation is avoided, the ratchet wheel can be effectively occluded, the stopping block is accommodated in the sliding groove, abrasion is not prone to occurring, and the service life of the ratchet wrench is prolonged.

Description

Ratchet wrench

Technical Field

The present invention relates to a wrench, and more particularly to a ratchet wrench.

Background

Referring to fig. 1, 2 and 3, a conventional ratchet wrench 1 includes a head 11, a ratchet 12, a locking unit 13, and a switching member 14. The head 11 comprises a receiving slot 111, a recessed area 112 having two stop surfaces 114, and a pivot hole 113 disposed between the stop surfaces 114. The ratchet 12 is pivotally disposed in the receiving groove 111. The locking unit 13 includes two locking blocks 131 pivoted in the accommodating groove 111 and two elastic members 132. Each elastic member 132 abuts against the respective catch block 131 and the inner wall of the receiving groove 111. The switch 14 includes a cam block 141 pivoted to the pivot hole 113 and located between the locking blocks 131, and a toggle switch 142 formed at the end of the cam block 141. The toggle switch 142 can be operated to rotate the cam block 141 to push against one of the catch blocks 131 so as not to engage with the ratchet 12.

For clarity of description of orientation or direction, references to orientation or direction below are made to the referenced drawings as oriented on the right, i.e., to the right of the drawings.

Referring to fig. 2, when the toggle switch 142 is pulled clockwise to abut against the stopping surface 114, the cam block 141 pushes the left-side latch block 131 away from the ratchet 12, and the right-side latch block 131 is engaged with the ratchet 12, so that the ratchet 12 can only rotate counterclockwise in one direction.

Referring to fig. 3, when the rotational direction of the ratchet 12 is to be switched, the toggle switch 142 is pulled in the counterclockwise direction to abut against the other stop surface 114, so that the left-side latch block 131 is engaged with the ratchet 12, and the right-side latch block 131 is pushed away from the ratchet 12. The toggle switch 142 is capable of rotating between the stop surfaces 114 and switching the rotational direction of the ratchet 12.

Referring to fig. 1 and 4, the recessed area 112 of the ratchet wrench 1 is formed by stamping, so the height of the stop surface 114 is limited to about 1mm or less. After the ratchet wrench 1 is used over the years, the toggle switch 142 is continuously moved and switched in the recessed area 112, so that the stopping surface 114 and the toggle switch 142 are worn and the stopping effect is reduced, so that the toggle switch 142 is easily slid out of the recessed area 112 (see fig. 5).

In addition to the factors that reduce the stopping effect by abrasion, the uneven height of the stopping surface 114 is one of the reasons that the stopping effect is reduced. Because the recessed area 112 is formed by stamping, each stop surface 114 has an inner end 115 adjacent to the cam block 141 and an outer end 116 distal from the cam block 141. The outer end 116 is shallower than the inner end 115 so that the end of the toggle switch 142 easily passes over the outer end 116 and out of the recessed area 112 (see fig. 5) when the switch member 14 is not locked but is slightly loose.

Referring to fig. 5 and 6, when the toggle switch 142 moves out of the range of the recess 112, the cam block 141 is driven to rotate out of the predetermined range, so that the locking blocks 131 are all pushed away from the ratchet 12, the ratchet 12 loses the characteristic of rotating only in a single direction, and cannot be used for turning a screw or a nut, and the ratchet wrench 1 loses its function. Therefore, the ratchet wrench 1 has a problem that the ratchet 12 cannot be engaged effectively when switching the steering after old wear.

Disclosure of Invention

The invention aims to provide a ratchet wrench which can effectively engage a ratchet wheel when steering is switched and prolong the service life.

The invention relates to a ratchet wrench, which comprises a body, a ratchet wheel, a clamping unit and a switching unit.

The body includes a head. The head part is provided with a containing groove and a pivot hole which is communicated with the outside and the containing groove.

The ratchet wheel can be pivotally arranged in the containing groove of the body and comprises a ratchet part surrounding the axis of the ratchet wheel.

The clamping unit comprises two clamping blocks and two elastic pieces. The clamping block is pivoted in the containing groove and is respectively positioned at the left side and the right side of the pivot hole. Each of the catch blocks has a tooth engaging portion which is detachably engaged with the ratchet portion. Each elastic piece is propped against the space between the corresponding clamping block and the inner wall of the containing groove.

The switching unit comprises a switching piece, a sliding groove and a stop block.

The switching piece is provided with a cam block and a toggle switch. The cam block is positioned between the clamping blocks and penetrates through the pivot hole. The toggle switch is positioned on the outer side of the body and is formed at the tail end of the cam block. The toggle switch can be operated to enable the cam block to rotate in a self-rotating mode to push against one of the clamping blocks, and the meshing tooth portion of the pushed clamping block is not meshed with the ratchet tooth portion of the ratchet wheel.

The sliding groove is arranged on one of the head part and the switching piece, is adjacent to the pivot hole and extends along the left and right directions. The sliding groove is provided with a left stop surface and a right stop surface.

The stop block is arranged on the other one of the head part and the switching piece and protrudes into the sliding groove. When the stop block abuts against one of the left stop surface and the right stop surface of the sliding groove, one of the meshing tooth parts is meshed with the ratchet tooth part of the ratchet wheel, and the other meshing tooth part is not meshed with the ratchet tooth part.

In the ratchet wrench of the invention, the sliding groove is arranged on the switching piece, and the stop block is arranged on the head.

In the ratchet wrench of the invention, the sliding groove is arranged at the head part, and the stop block is arranged at the switching piece.

According to the ratchet wrench, the toggle switch of the switching piece covers the sliding groove, so that the sliding groove is not communicated with the outside when the toggle switch moves and switches.

According to the ratchet wrench, the depth of the sliding groove is larger than 1mm, and the length of the stop block is larger than 1 mm.

In the ratchet wrench of the present invention, the cam block of the switching member has an axis passing through the center of the pivot hole, the sliding slot is arc-shaped, and the center of the sliding slot is located on the axis.

In the ratchet wrench of the invention, the stop block is generally in the shape of an arc with the circle center on the axis, and the maximum arc length of the stop block is 1/2-1/4 of the arc length of the sliding chute.

In the ratchet wrench, the cam block is provided with two positioning surfaces respectively positioned on the left side and the right side and two pushing surfaces respectively positioned on the left side and the right side, the positioning surfaces are far away from the ratchet wheel, the pushing surfaces are adjacent to the ratchet wheel, and when one of the pushing surfaces pushes the corresponding clamping block, the meshing part of the pushed clamping block is not meshed with the ratchet part.

In the ratchet wrench, the cam block is provided with two positioning surfaces respectively positioned on the left side and the right side and two pushing surfaces respectively positioned on the left side and the right side, the positioning surfaces are adjacent to the ratchet wheel, the pushing surfaces are far away from the ratchet wheel, and when one of the pushing surfaces pushes the corresponding clamping block, the meshing part of the pushed clamping block is not meshed with the ratchet part.

The cam block of the ratchet wrench of the invention is provided with two pushing and abutting surfaces respectively positioned at the left side and the right side, each pushing and abutting surface protrudes outwards and is slightly arc-shaped, each clamping and pulling block is also provided with a groove formed at one side adjacent to the pivot hole, and the groove is used for the corresponding pushing and abutting surface to abut and position.

The invention has the beneficial effects that: the rotating range of the switching piece is limited by the matching of the sliding groove and the stop block, so that the ratchet wheel can be effectively engaged when the steering is switched, and the stop block is accommodated in the sliding groove, is isolated from the outside and is not easy to wear, so that the stopping and limiting effects can be maintained, the switching piece can still be switched within a preset range after the ratchet wrench is used for a long time, and the service life is prolonged.

Drawings

Other features and effects of the present invention will become apparent from the following detailed description of the embodiments with reference to the accompanying drawings, in which:

FIG. 1 is a perspective view of a prior art ratchet wrench;

FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1, illustrating a toggle switch of the ratchet wrench being moved to the left and abutting a stop surface;

FIG. 3 is a view similar to FIG. 2, illustrating the toggle switch being toggled to the right and against another stop surface;

FIG. 4 is a partial cross-sectional view illustrating the toggle switch and the stop surface;

FIG. 5 is a perspective view illustrating the toggle switch of the ratchet wrench moving beyond a range of a recessed area;

FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 5 illustrating over-rotation of a cam block to disengage two detent blocks of the ratchet wrench from engagement with a ratchet;

FIG. 7 is an exploded perspective view illustrating a ratchet wrench according to a first embodiment of the present invention;

fig. 8 is a partial exploded perspective view illustrating a switch and a chute of the first embodiment;

FIG. 9 is a partial cross-sectional view illustrating a stop of the first embodiment abutting a right stop surface of the slot to limit a toggle switch from continuing to rotate counterclockwise;

FIG. 10 is a view similar to FIG. 9, illustrating the stop of the first embodiment abutting against a left stop surface of the sliding slot to limit the toggle switch from continuing to rotate clockwise;

FIG. 11 is a partial cross-sectional view of the ratchet wrench illustrating the stop of the second embodiment of the present invention abutting against the left stop surface of the slot to limit the further clockwise rotation of a toggle switch;

FIG. 12 is a view similar to FIG. 11, illustrating the stop of the second embodiment abutting against the right stop surface of the sliding slot to limit the toggle switch from continuing to rotate counterclockwise.

FIG. 13 is a partially exploded view illustrating a switching unit of a third embodiment of the ratchet wrench of the present invention;

FIG. 14 is a partial cross-sectional view illustrating the stop of the third embodiment abutting against the right stop surface of the sliding slot to limit the toggle switch from rotating in a counterclockwise direction;

FIG. 15 is a view similar to FIG. 14, illustrating the stop block of the third embodiment abutting against the left stop surface of the sliding slot to limit the toggle switch from continuing to rotate clockwise;

FIG. 16 is an exploded perspective view of a portion of a body and a switch of a fourth embodiment of the ratchet wrench of the present invention; and

fig. 17 is a partially exploded view illustrating the sliding slot and the stop block of the fourth embodiment.

Detailed Description

Before the present invention is described in detail, it should be noted that in the following description, similar components are denoted by the same reference numerals. For purposes of clarity, the following description of an orientation or direction will refer to the referenced figure as it is oriented, and when referring to the right side, will refer to the right side of the referenced figure.

Referring to fig. 7, 8 and 9, a ratchet wrench according to a first embodiment of the present invention comprises: a body 2, a ratchet wheel 3, a driving piece 4, a clamping unit 5 and a switching unit 6.

The body 2 comprises a head 21 and a shank 22. The head 21 has a receiving slot 211 and a pivot hole 212 communicating with the receiving slot 211. The handle 22 extends outwardly from the head 21 and can be held by a user.

The ratchet 3 is pivotably disposed in the pocket 211 of the body 2 and includes a ratchet portion 31 about a self axis L1.

The driving member 4 is disposed on the ratchet wheel 3, and its three-dimensional configuration is matched with a screw (not shown) of a corresponding type to be able to be engaged with the screw of the type to loosen or drive the screw. The drive member 4 is also spatially configured to engage a socket (not shown) for loosening or tightening a screw or nut (not shown). Since the screw, the nut and the socket sleeve are all conventional objects, the three-dimensional configuration of the driving member 4 can be adjusted as required, and the embodiment in the drawings is only for illustration and is not limited thereto.

The locking unit 5 includes two locking blocks 51 and two elastic members 52. The locking block 51 is pivoted to the accommodating groove 211 and is respectively located at the left and right sides of the pivot hole 212. Each of the latch blocks 51 has a tooth engaging portion 511 and a pivot portion 512 at opposite ends thereof. The engaging teeth 511 are serrated and can be disengaged from the ratchet teeth 31 of the ratchet 3. The pivot portion 512 is pivotally disposed in the receiving slot 211, so that the latch 51 can pivot in the receiving slot 211.

Each elastic member 52 abuts against the respective catch block 51 and the inner wall of the receiving groove 211. Each elastic member 52 provides an elastic biasing force to urge each engaging tooth portion 511 of each engaging block 51 toward the ratchet tooth portion 31 of the ratchet 3. In this embodiment, the elastic members 52 are compression springs.

The switching unit 6 includes a switching member 61, a sliding slot 62, and a stop block 63.

The switch 61 has a cam block 611 and a toggle switch 612. The cam block 611 is located between the locking blocks 51 and passes through the pivot hole 212. The cam block 611 has an axis L2, two positioning surfaces 613 respectively located at the left and right sides, and two pushing surfaces 614 respectively located at the left and right sides. The axis L2 passes through the center of the pivot hole 212 and is parallel to the self axis L1 of the ratchet 3, wherein the axis L2 is also the central axis of the pivot hole 212. The positioning surface 613 is farther away from the ratchet 3, and the pushing surface 614 is closer to the ratchet 3. The cam block 611 can push against one of the engaging blocks 51, so that the engaging tooth portion 511 of the pushed engaging block 51 is not engaged with the ratchet tooth portion 31 of the ratchet 3.

The cam block 611 can rotate around the axis L2 to selectively allow one of the pushing surfaces 614 to abut against the corresponding detent block 51 and push the detent block 51 to make the engaging portion 511 away from the ratchet wheel 3 without engaging with the engaging portion 31 of the ratchet wheel 3. To further explain with fig. 9, when the pushing surface 614 at the left side of fig. 9 abuts against the corresponding engaging block 51 at the left side, the engaging block 51 at the left side is pushed away from the ratchet 3, so that the engaging tooth portion 511 is not engaged with the ratchet tooth portion 31 of the ratchet 3, and at this time, the positioning surface 613 at the right side faces and is spaced apart from the engaging block 51 at the right side, so that the engaging block 51 at the right side can be engaged with the ratchet 3 without being pushed by the cam block 611. By rotating the cam block 611, the catch block 51 can be alternatively engaged to the ratchet 3.

The toggle switch 612 is located at the outside of the body 2 and is formed at the end of the cam block 611. The toggle switch 612 extends in a direction generally perpendicular to the axis L2. The toggle switch 612 can be operated to spin the cam block 611 about the axis L2.

The sliding slot 62 is disposed on the head 21 of the body 2 and adjacent to the pivot hole 212, and extends generally along the left-right direction. The sliding slot 62 has a left stop surface 621 and a right stop surface 622. The sliding groove 62 can be drilled in the head 21 of the body 2 by means of a drill, which can be connected or disconnected with the pivot hole 212. The depth of the sliding groove 62 is preferably greater than 1mm, more preferably, the depth of the sliding groove 62 is greater than 2mm, and still more preferably, the depth of the sliding groove 62 is greater than 3 mm. The sliding slot 62 can also extend from the head 21 of the body 2 toward the accommodating slot 211, penetrate the wall surface of the head 21 and communicate with the accommodating slot 211. In the present embodiment, the sliding groove 62 has a depth of 3.5mm and is communicated with the pivot hole 212.

The stop block 63 is disposed on the switching member 61 and protrudes into the sliding slot 62. The stop block 63 can be disposed on the cam block 611 or on the toggle switch 612, and can be adjusted as desired. The length of the stop block 63 matches the depth of the sliding groove 62, and is slightly smaller than the depth of the sliding groove 62, and the length is preferably greater than 1mm, more preferably greater than 2mm, and still more preferably greater than 3 mm. However, when the sliding groove 62 penetrates the wall surface of the head portion 21, the length of the stopper 63 can be greater than the wall surface thickness of the head portion 21. In this embodiment, the stopper 63 has a length of 3mm and is disposed on the cam block 611.

When the stop block 63 abuts against one of the left stop surface 621 and the right stop surface 622 of the sliding slot 62, the toggle switch 612 is stopped and cannot rotate any more, and at this time, one of the engaging tooth portions 511 is engaged with the ratchet portion 31 of the ratchet 3, and the other engaging tooth portion 511 is not engaged with the ratchet portion 31. It should be noted that the width of the toggle switch 612 is sufficient to cover the sliding slot 62, and the toggle switch 612 does not allow the sliding slot 62 to communicate with the outside when the clockwise or counterclockwise rotation movement is switched.

The user can pull the toggle switch 612 to drive the cam block 611 to rotate around the axis L2, so that one of the pushing surfaces 614 pushes the corresponding detent block 51 to prevent it from engaging with the ratchet 3.

Referring to fig. 9, pulling the toggle switch 612 in the counterclockwise direction drives the cam block 611 to rotate around the axis L2, so that the pushing surface 614 at the left side of the cam block 611 abuts against the engaging block 51 at the left side to push the engaging block away from the ratchet 3, and the engaging block 51 at the right side is spaced from the positioning surface 613 at the right side of the cam block 611. At this time, the latch 51 on the right side is driven by the elastic biasing force of the elastic member 52 abutting against it, so that the engaging tooth portion 511 thereon engages with the ratchet tooth portion 31, and the ratchet 3 can only rotate in one direction and counterclockwise.

Referring to fig. 10, the toggle switch 612 is pulled clockwise, so that the switching member 61 rotates and drives the stopping block 63 to abut against the left stopping surface 621 of the sliding slot 62, and the moving cannot be continued. The pushing surface 614 on the right side of the cam block 611 abuts against the right-hand engaging block 51 to push it away from the ratchet 3, and the left-hand engaging block 51 is spaced apart from the positioning surface 613 on the left side of the cam block 611. At this time, the latch block 51 on the left side is pushed by the elastic member 52 to engage with the ratchet portion 31, so that the ratchet 3 can only rotate clockwise and unidirectionally. Thus, the user can switch the rotation direction of the ratchet 3 by pulling the toggle switch 612 according to the operation requirement, and the driving member 4 installed on the ratchet 3 can rotate or loosen the screw or the sleeve.

The present invention limits the rotation range of the switching member 61 through the cooperation of the sliding slot 62 and the stopping block 63, so that the ratchet wheel 3 can be effectively engaged when switching the steering, and the stopping block 63 is accommodated in the sliding slot 62, is isolated from the outside, is not easily worn, can maintain the stopping and limiting effect, and can ensure that the switching member 61 can still switch within the predetermined range after the ratchet wrench is used for a long time, thereby increasing the service life.

Thus, the advantages of the ratchet wrench of the present invention can be summarized as follows:

firstly, the stopping block 63 is accommodated in the sliding groove 62, and is not easy to be worn, so that the stopping and limiting effect can be maintained, and the service life of the ratchet wrench can be prolonged.

Secondly, by increasing the depth of the sliding slot 62 and the length of the stopping block 63, the stability of the two parts abutting against each other can be improved, the probability of the stopping block 63 sliding out of the sliding slot 62 is reduced, and the switching piece 61 is prevented from over rotating to cause the failure of the ratchet wrench.

Thirdly, the sliding groove 62 is covered by the switching member 61, so that fine particles such as dust or debris can be prevented from entering the sliding groove 62, thereby maintaining smooth switching of the switching member 61 and preventing the stop block 63 from being worn.

Referring to fig. 11 and 12, a second embodiment of the ratchet wrench of the present invention is substantially the same as the first embodiment, except for the structure of the cam block 611.

The positioning surface 613 of the cam block 611 is closer to the ratchet 3, and the pushing surface 614 is farther from the ratchet 3. When one of the positioning surfaces 613 abuts against the corresponding detent block 51, the engaging tooth portion 511 of the corresponding detent block 51 is engaged with the ratchet tooth portion 31 of the ratchet 3, and when one of the pushing surfaces 614 abuts against the corresponding detent block 51, the engaging tooth portion 511 of the corresponding detent block 51 is not engaged with the ratchet tooth portion 31.

The toggle switch 612 is pulled clockwise to rotate the switching member 61 and drive the stopping block 63 to abut against the left stopping surface 621 of the sliding slot 62, so as to stop moving, which is the state shown in fig. 11. Referring to fig. 11, the pushing surface 614 on the left side of the cam block 611 pushes the detent block 51 on the left side away from the ratchet wheel 3, and the positioning surface 613 on the right side abuts against the corresponding detent block 51 on the right side, so that the detent block 51 on the right side engages with the ratchet wheel 3. At this time, the ratchet 3 can rotate only in one direction and counterclockwise.

The toggle switch 612 is pulled to move counterclockwise, so as to drive the stop block 63 to abut against the right stop surface 622 of the sliding slot 62 and cannot move further, i.e. the state shown in fig. 12 is reached. In fig. 12, the pushing surface 614 on the right side of the cam block 611 pushes the right-hand engaging block 51 away from the ratchet wheel 3, and the left-hand engaging block 51 abuts against the corresponding positioning surface 613 and engages with the ratchet wheel 3. At this time, the ratchet 3 can rotate only in one direction and clockwise. The user can switch the rotational direction of the ratchet 3 by pulling the toggle switch 612 according to the operation requirement.

Thus, the present embodiment adopts another configuration of the cam block 611, such that the toggle switch 612 switches the direction in which the ratchet 3 can rotate clockwise and counterclockwise, which is opposite to the first embodiment. Thus, by changing the configuration of the cam block 611, users of different dominant hands can be satisfied.

Referring to fig. 13 and 14, a third embodiment of the ratchet wrench of the present invention is substantially the same as the first embodiment, except for the structure of the locking block 51 and the switching unit 6.

Each detent block 51 also has a recess 513. Each recess 513 is formed on a side of each catch block 51 adjacent to the pivot hole 212. The cam block 611 of the switching unit 6 has two pushing surfaces 614 respectively located at the left and right sides and protruding outward, and each pushing surface 614 is slightly arc-shaped. The toggle switch 612 has a disc portion 615 and a toggle portion 616 extending from the disc portion 615 in a direction perpendicular to the axis L2. The sliding slot 62 is circular arc-shaped and the center of the arc-shaped sliding slot is located on the axis L2. The stopper 63 is formed at the angle between the disk portion 615 and the cam block 611, and is generally shaped like an arc with its center on the axis L2, and the maximum arc length is 1/2 to 1/4 of the arc length of the sliding groove 62. In this embodiment, the arc length of the stop block 63 is about 1/2 of the arc length of the slide slot 62.

The disk portion 615 has a first radius R1 that is larger than a second radius R2 of the outer periphery of the sliding slot 62, so that after the switching member 61 is installed in the pivot hole 212, the disk portion 615 can cover the sliding slot 62, and when the pulling portion 616 is pulled to any angle, the disk portion 615 can prevent the sliding slot 62 from communicating with the outside, thereby preventing fine particles such as dust or debris from entering the sliding slot 62, thereby maintaining smooth switching of the switching member 61 and preventing the stopper 63 from being worn.

The arc length of the stopping block 63 is 1/2 of the arc length of the sliding slot 62, and the width is larger than that of the first embodiment, so that the contact area between the stopping block 63 and the sliding slot 62 can be increased by increasing the width, the switching member 61 can be more stably supported, and the switching member 61 is prevented from shaking to deviate from a preset position during assembly.

Referring to fig. 14 and 15, the recess 513 on each detent block 51 is used for the corresponding pushing surface 614 to push against and position. The pulling portion 616 is pulled to make the cam block 611 rotate, so as to push against one of the detent blocks 51, and finally, the pushed detent block 51 is engaged and positioned in the groove 513 of the pushed detent block 51, thereby controlling the pushed detent block 51 not to be engaged with the ratchet 3. When the stop block 63 abuts against one of the left stop surface 621 and the right stop surface 622 of the sliding slot 62, one of the engaging tooth portions 511 is engaged with the ratchet tooth portion 31 of the ratchet 3, and the other is not engaged with the ratchet tooth portion 31. The details of switching the rotational direction of the ratchet 3 by pulling the switching member 61 are disclosed in detail in the first embodiment and will not be described herein.

Thus, the present embodiment not only has the same effect as the first embodiment, but also prevents the switching member 61 from deviating from the predetermined position due to shaking during assembly by increasing the width of the cam block 611, and the pushing surface 614 of the cam block 611 can be stably positioned on the detent block 51 by matching the cam block 611 and the detent block 51 with another configuration.

Referring to fig. 16 and 17, a fourth embodiment of the ratchet wrench of the present invention is substantially the same as the third embodiment, except for the positions of the sliding slot 62 and the stop block 63.

The position of the sliding slot 62 is set on the toggle switch 612 of the switching member 61, and the depth of the sliding slot 62 is preferably 2 to 3 mm. The stop block 63 is formed on the head 21 of the body 2 and adjacent to the pivot hole 212, and the length of the stop block 63 matches the depth of the sliding slot 62. In the embodiment, the depth of the sliding slot 62 is 2.5mm, and the length of the stop block 63 is approximately equal to 2.5 mm.

In a preferred embodiment, the pivot hole 212 is milled into the head 21, a hole (not shown) is drilled next to the milled hole, and the stop 63 is then fastened into the hole (not shown). The chute 62 is formed by directly turning and milling the disc portion 615.

Thus, in the present embodiment, the sliding groove 62 and the stopping block 63 are arranged in another way, so that the user can select the sliding groove according to the needs.

In summary, the ratchet wrench of the present invention, through the cooperation of the sliding slot 62 and the stopping block 63, not only can prevent the switching member 61 from over-rotating and the ratchet 3 from being engaged effectively, but also can prevent the stopping block 63 from being worn, so as to increase the service life, and thus the object of the present invention can be achieved.

The above description is only an example of the present invention, and the scope of the present invention should not be limited thereby, and the invention is still within the scope of the present invention by simple equivalent changes and modifications made according to the claims and the contents of the specification.

Claims (6)

1. A ratchet wrench, comprising:

the body comprises a head part, a first connecting part and a second connecting part, wherein the head part is provided with an accommodating groove and a pivot hole which is communicated with the outside and the accommodating groove;

a ratchet wheel which can be pivotally arranged in the containing groove of the body and comprises a ratchet part surrounding the axis of the ratchet wheel;

the clamping unit comprises two clamping blocks and two elastic pieces, the clamping blocks are pivoted in the accommodating groove and are respectively positioned at the left side and the right side of the pivot hole, each clamping block is provided with a meshing tooth part which can be meshed with the ratchet part in a disengaging way, and each elastic piece is abutted between the respective clamping block and the inner wall of the accommodating groove; and

a switching unit, including a switching piece, the switching piece has a cam block and a toggle switch, the cam block is located between the clamping blocks and passes through the pivot hole, the toggle switch is located outside the body and formed at the end of the cam block, the toggle switch can be operated to make the cam block spin, and push against one of the clamping blocks, so that the tooth engaging part of the pushed clamping block is not engaged with the ratchet part of the ratchet wheel,

the method is characterized in that:

the switching unit further comprises a sliding groove and a stop block,

the sliding groove is arranged on the switching piece, is adjacent to one end of the toggle switch connected with the cam block and extends along the left and right directions, and is provided with a left stopping surface and a right stopping surface,

the stop block is arranged at the head and protrudes into the sliding groove, when the stop block abuts against one of the left stop surface and the right stop surface of the sliding groove, one of the meshing tooth parts is meshed with the ratchet tooth part of the ratchet wheel, while the other meshing tooth part is not meshed with the ratchet tooth part, and the toggle switch of the switching piece covers the sliding groove, so that the sliding groove is not communicated with the outside when the toggle switch moves and switches.

2. The ratchet wrench of claim 1, wherein: the depth of the sliding groove is larger than 1mm, and the length of the stop block is larger than 1 mm.

3. The ratchet wrench of claim 1, wherein: the cam block of the switching piece has an axis passing through the center of the pivot hole, the sliding slot is arc-shaped, and the center of the sliding slot is located on the axis.

4. The ratchet wrench of claim 1, wherein: the cam block is provided with two positioning surfaces which are respectively positioned on the left side and the right side and two pushing surfaces which are respectively positioned on the left side and the right side, the positioning surfaces are far away from the ratchet wheel, the pushing surfaces are adjacent to the ratchet wheel, when one of the pushing surfaces pushes the corresponding clamping block, the tooth meshing part of the pushed clamping block is not meshed with the ratchet part.

5. The ratchet wrench of claim 1, wherein: the cam block is provided with two positioning surfaces respectively positioned on the left side and the right side and two pushing surfaces respectively positioned on the left side and the right side, the positioning surfaces are adjacent to the ratchet wheel, the pushing surfaces are far away from the ratchet wheel, and when one of the pushing surfaces pushes the corresponding clamping block, the tooth meshing part of the pushed clamping block is not meshed with the ratchet part.

6. The ratchet wrench of claim 1, wherein: the cam block has two pushing surfaces located on the left and right sides, each pushing surface is protruded outwards to be slightly arc-shaped, each clamping block also has a groove formed on one side adjacent to the pivot hole, and the groove is used for the corresponding pushing surface to lean against and locate.

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