TWI615245B - Ratchet wrench - Google Patents

Abstract

A ratchet wrench includes a body, a ratchet, a two-clamp block and a switching unit. The body includes a head having a pocket. The ratchet is pivotally disposed in the pocket. The card blocks are pivoted in the pocket. The switching unit includes a switching member, a sliding slot and a blocking block. The switching member is operable to push against the latching blocks such that the latching blocks are selectively engaged with the ratchet. The chute is opened in one of the head and the switching member. The stop block is disposed on the other of the head and the switching member and protrudes into the sliding slot. The sliding slot and the stopping block can limit the rotation range of the switching member, avoid excessive rotation, enable the ratchet to be effectively engaged, and extend the ratchet wrench because the blocking block is accommodated in the sliding slot and is not easy to wear. Service life.

Description

Ratchet wrench

The invention relates to a wrench, in particular to a ratchet wrench.

Referring to Figures 1, 2 and 3, a conventional ratchet wrench 1 includes a head 11, a ratchet 12, a latch unit 13, and a switching member 14. The head portion 11 includes a recess 111, a recessed portion 112 having a second stop surface 114, and a pivot hole 113 disposed between the stop surfaces 114. The ratchet 12 is pivotally disposed within the pocket 111. The latch unit 13 includes two latching blocks 131 pivoted in the pocket 111 and two elastic members 132. Each elastic member 132 abuts between the respective latch block 131 and the inner wall of the pocket 111. The switching member 14 includes a cam block 141 pivoted between the pivot holes 113 and positioned between the latching blocks 131, and a toggle switch 142 formed at the end of the cam block 141. The toggle switch 142 is operable to cause the cam block 141 to spin and push against one of the latching blocks 131 so as not to engage the ratchet 12.

In order to clearly describe the orientation or direction, the orientation or orientation referred to below is a reference to the orientation of the referenced drawing, and when referring to the right side, it refers to the right side of the drawing.

Referring to FIG. 2, the toggle switch 142 is pulled clockwise to abut against the stop surface 114. At this time, the cam block 141 pushes the latch block 131 on the left side away from the ratchet 12, and the right side of the handle block 141 The latch block 131 is engaged to the ratchet 12 such that the ratchet 12 can only be rotated in a counterclockwise direction unidirectionally.

Referring to FIG. 3, when the rotatable direction of the ratchet 12 is to be switched, if the toggle switch 142 is pulled counterclockwise to abut against the other stop surface 114, the card on the left side can be made. Block 131 engages the ratchet 12 and pushes the latch block 131 on the right side away from the ratchet 12. The toggle switch 142 is rotatable between the stop faces 114 and switches the rotatable direction of the ratchet 12.

Referring to FIGS. 1 and 4, the recessed portion 112 of the ratchet wrench 1 is mostly formed by press forming, and thus the height of the stop faces 114 is limited to about 1 mm. After the ratchet wrench 1 is used for a long period of time, the toggle switch 142 is continuously switched in the recessed area 112, causing the stop surfaces 114 and the toggle switch 142 to wear, and the blocking effect is reduced. The toggle switch 142 easily slides out of the recessed area 112 (see Fig. 5).

In addition to the factors that reduce the blocking effect due to wear, the height unevenness of the stop faces 114 is also one of the causes of the deteriorating blocking effect. Since the recessed portion 112 is formed by press forming, each of the stop faces 114 has an inner end portion 115 adjacent to the cam block 141 and an outer end portion 116 away from the cam block 141. The height of the outer end portion 116 is shallower than the inner end portion 115. Thus, when the switching member 14 is not locked and slightly loosened, the end of the toggle switch 142 easily crosses the outer portion. The end 116 extends over the recessed area 112 (see Figure 5).

Referring to FIG. 5 and FIG. 6, when the toggle switch 142 is out of the range of the recessed area 112, the cam block 141 is rotated to deviate from the predetermined range, so that the latching blocks 131 are pushed away from the predetermined range. The ratchet 12, which thus loses its ability to rotate only in a single direction, cannot be used to turn a screw or nut, and the ratchet wrench 1 then loses its function. Therefore, the ratchet wrench 1 often has a problem that the ratchet 12 cannot be effectively engaged when the steering is switched after being worn out.

Accordingly, it is an object of the present invention to provide a ratchet wrench that can effectively bite and extend the useful life of a ratchet when switching steering.

Thus, the ratchet wrench of the present invention comprises a body, a ratchet, a cassette unit, and a switching unit.

The body includes a head. The head has a receiving slot and a pivot hole connecting the outside and the receiving slot.

The ratchet is pivotally disposed in the pocket of the body and includes a ratchet portion surrounding the axis of the body.

The cassette unit comprises a two-clamp block and two elastic members. The latching blocks are pivotally disposed in the pockets and are respectively located on the left and right sides of the pivot hole. Each of the latching blocks has a toothed portion that is releasably engaged with the ratchet portion. Each of the elastic members abuts between the respective latching block and the inner wall of the recess.

The switching unit includes a switching member, a sliding slot, and a blocking block.

The switching member has a cam block and a toggle switch. The cam block is located between the latching blocks and passes through the pivot hole. The toggle switch is located outside the body and is formed at the end of the cam block. The toggle switch is operable to cause the cam block to spin and push against one of the latching blocks such that the rod portion of the latched block that is pushed against does not engage the ratchet of the ratchet unit.

The sliding slot is formed in one of the head and the switching member, adjacent to the pivot hole, and extends in a left-right direction. The chute has a left stop surface and a right stop surface.

The stop block is disposed on the other of the head and the switching member and protrudes into the sliding slot. When the stop block abuts against one of the left stop surface and the right stop surface of the chute, one of the rod teeth engages the ratchet portion of the ratchet, and the other The rod portion does not engage the ratchet portion.

The effect of the present invention is to limit the range of rotation of the switching member through the cooperation of the sliding slot and the stopping block, so that the ratchet can be effectively engaged when the steering is switched, and because the blocking block is accommodated in the The chute is isolated from the outside, is not susceptible to wear, and can maintain the effect of the stop limit. It can ensure that the switch can still be switched within a predetermined range after long-term use, thereby increasing the service life.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals. Wherein, in order to clearly describe the orientation or direction, the following reference to the orientation or direction is a reference to the orientation of the referenced drawing, and when referring to the right side, it refers to the right side of the referenced figure.

Referring to FIG. 7 , FIG. 8 and FIG. 9 , a first embodiment of the ratchet wrench of the present invention comprises: a body 2 , a ratchet 3 , a driving member 4 , a latching unit 5 , and a switching unit 6 .

The body 2 includes a head 21 and a handle 22. The head 21 has a receiving slot 211 and a pivot hole 212 connecting the outside and the receiving slot 211. The handle 22 extends outwardly from the head 21 for use by a user.

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

The driving member 4 is disposed on the ratchet wheel 3, and the three-dimensional configuration is matched with a corresponding type of screw (not shown) to be fitted with the screw of the model to loosen or drive the screw. The three-dimensional configuration of the driving member 4 can also be used to fit a set of sockets (not shown) for loosening or locking screws or nuts (not shown). Since the screw, the nut and the sleeve are all known items, the three-dimensional configuration of the driving member 4 can be adjusted as needed. The embodiment of the present embodiment is for illustrative purposes only, and is not Limited.

The cassette unit 5 includes two latching blocks 51 and two elastic members 52. The latching blocks 51 are pivotally disposed on the slots 211 and are respectively located on the left and right sides of the pivot hole 212. Each of the latching blocks 51 has a rod portion 511 and a pivoting portion 512 respectively located at opposite end portions. The rod portions 511 are serrated and are detachably engaged with the ratchet portion 31 of the ratchet 3. The pivoting portions 512 are pivotally disposed in the receiving slots 211 to allow the latching blocks 51 to pivot in the receiving slots 211.

Each elastic member 52 abuts between the respective latch block 51 and the inner wall of the pocket 211. Each of the elastic members 52 provides a resilient biasing force to urge each of the claw portions 511 of each of the latching blocks 51 to approach the ratchet portion 31 of the ratchet wheel 3. In this embodiment, the elastic members 52 all adopt compression springs.

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

The switching member 61 has a cam block 611 and a toggle switch 612. The cam block 611 is located between the latching blocks 51 and passes through the pivot hole 212. The cam block 611 has an axis L2, two positioning faces 613 respectively located on the left and right sides, and two pushing faces 614 respectively located on 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 surfaces 613 are relatively far from the ratchet 3, and the pushing surfaces 614 are relatively adjacent to the ratchet 3. The cam block 611 can push against one of the latching blocks 51 such that the rod portion 511 of the latching block 51 that is pushed against does not engage the ratchet portion 31 of the ratchet wheel 3.

The cam block 611 is rotatable about the axis L2, and optionally one of the pushing surfaces 614 abuts against the corresponding latching block 51, and pushes the latching block 51 away from the latching portion 511. The ratchet 3 does not engage the ratchet portion 31 of the ratchet 3. As further illustrated in FIG. 9, when the pushing surface 614 located on the left side of FIG. 9 abuts against the latching block 51 on the left side corresponding thereto, the latching block 51 on the left side is pushed away from the ratchet 3, so that The rod portion 511 does not engage the ratchet portion 31 of the ratchet wheel 3. At this time, the positioning surface 613 on the right side faces and is spaced apart from the latch block 51 on the right side, whereby the latch block 51 on the right side does not The ratchet 3 can be engaged by the pushing of the cam block 611. By rotating the cam block 611, the latching blocks 51 can be selectively engaged to the ratchet wheel 3.

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

The sliding slot 62 is defined in the head portion 21 of the body 2 and adjacent to the pivot hole 212, and extends substantially in the left-right direction. The chute 62 has a left stop surface 621 and a right stop surface 622. The chute 62 can be drilled in the head 21 of the body 2, and can communicate with or not communicate with the pivot hole 212. The depth of the chute 62 is preferably greater than 1 mm. More preferably, the depth of the chute 62 is greater than 2 mm, and more preferably, the depth of the chute 62 is greater than 3 mm. The chute 62 is also extended from the head 21 of the body 2 toward the receiving slot 211 to penetrate the wall surface of the head 21 and communicate with the receiving slot 211. In this embodiment, the chute 62 has a depth of 3.5 mm and is in communication with the pivot hole 212.

The stopping block 63 is disposed on the switching member 61 and protrudes into the sliding slot 62. The blocking block 63 can be disposed on the cam block 611 or on the toggle switch 612, and the end can be adjusted as needed. The length of the stop block 63 cooperates with the depth of the chute 62, which is approximately less than the depth of the chute 62. The length is preferably greater than 1 mm, more preferably greater than 2 mm, and even more preferably greater than 3 mm. However, when the chute 62 penetrates the wall surface of the head portion 21, the length of the stopper piece 63 can be greater than the wall thickness of the head portion 21. In the present embodiment, the stopper 63 has a length of 3 mm and is disposed on the cam block 611.

When the blocking block 63 abuts against one of the left stopping surface 621 and the right stopping surface 622 of the sliding slot 62, the toggle switch 612 is blocked and cannot continue to rotate. One of the rod portions 511 is engaged with the ratchet portion 31 of the ratchet 3, and the other rod portion 511 is not engaged with the ratchet portion 31. It is worth mentioning that the width of the toggle switch 612 is sufficient to cover the sliding slot 62, and the toggle switch 612 is prevented from communicating with the outside when the clockwise or counterclockwise rotational movement is switched.

The user can pull the toggle switch 612 to rotate the cam block 611 about the axis L2, and then push one of the pushing surfaces 614 against the corresponding latch block 51 so as not to The ratchet 3 meshes.

Referring to FIG. 9, the toggle switch 612 is flipped counterclockwise to drive the cam block 611 to rotate about the axis L2, and then the card is abutted against the card on the left side through the pushing surface 614 located on the left side of the cam block 611. The block 51 is pushed away from the ratchet 3, and the click block 51 on the right side is spaced apart from the positioning surface 613 on the right side of the cam block 611. At this time, the latch block 51 located on the right side is driven by the elastic biasing force of the elastic member 52 abutting thereon, so that the rod portion 511 thereon is engaged with the ratchet portion 31, so that the ratchet wheel 3 is only It can rotate in one direction and counterclockwise.

Referring to FIG. 10, the toggle switch 612 is pulled in a clockwise direction to rotate the switching member 61 and bring the blocking block 63 against the left stop surface 621 of the sliding slot 62 to continue moving. The pushing surface 614 located on the right side of the cam block 611 abuts against the latching block 51 on the right side, pushing it away from the ratchet 3, and the latching block 51 on the left side and the positioning surface on the left side of the cam block 611 613 are spaced apart. At this time, the latch block 51 positioned on the left side is pushed by the elastic member 52 to engage the ratchet portion 31, so that the ratchet wheel 3 can be rotated only in one direction and clockwise. In this way, the user can switch the rotatable direction of the ratchet wheel 3 by pulling the toggle switch 612 according to the operation requirement thereof, and the driving member 4 mounted on the ratchet wheel 3 can rotate or loosen the screw or the sleeve. cylinder.

The invention limits the range of rotation of the switching member 61 through the cooperation of the sliding groove 62 and the stopping block 63, so that the ratchet wheel 3 can be effectively engaged when the steering is switched, and the blocking block 63 is accommodated in the The chute 62 is isolated from the outside, is not susceptible to wear, and can maintain the effect of the stop limit. It can ensure that the switchgear can still be switched within a predetermined range after long-term use of the ratchet wrench, thereby increasing Service life.

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

1. The stop block 63 is received in the sliding slot 62, is not susceptible to wear, and can maintain the stop limit, thereby increasing the service life of the ratchet wrench.

2. By increasing the depth of the sliding slot 62 and the length of the blocking block 63, the degree of stability against each other can be improved, and the probability that the blocking block 63 slides out of the sliding slot 62 can be reduced, and the switching member 61 can be prevented from being excessive. Rotate to disable the ratchet wrench.

3. The chute 62 is covered by the switching member 61, so that fine particles such as dust or debris can be prevented from entering the chute 62, thereby maintaining smooth switching of the switching member 61 and avoiding wear of the blocking block 63.

Referring to Figures 11 and 12, a second embodiment of a 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 surfaces 613 of the cam block 611 are closer to the ratchet wheel 3, and the pushing surfaces 614 are farther away from the ratchet wheel 3. When the positioning surface 613 abuts against the corresponding latching block 51, the corresponding rod portion 511 of the corresponding latching block 51 is engaged with the ratchet portion 31 of the ratchet 3, and one of the When the pushing surface 614 abuts against the corresponding latching block 51, the corresponding rod portion 511 of the corresponding latching block 51 does not engage the ratchet portion 31.

The toggle switch 612 is rotated in a clockwise direction, so that the switching member 61 rotates and drives the blocking block 63 against the left stop surface 621 of the sliding slot 62, and cannot continue to move. The state shown in 11. Referring to FIG. 11, the pushing surface 614 located on the left side of the cam block 611 pushes the latch block 51 located on the left side away from the ratchet 3, and the positioning surface 613 on the right side abuts the corresponding card on the right side. Block 51, the latch block 51 on the right side is engaged to the ratchet 3. At this time, the ratchet 3 can only rotate in one direction and counterclockwise.

The toggle switch 612 is moved in the counterclockwise direction to drive the stop block 63 against the right stop surface 622 of the chute 62 to continue moving, that is, to the state shown in FIG. Referring to FIG. 12, the pushing surface 614 located on the right side of the cam block 611 pushes the latching block 51 located on the right side away from the ratchet 3, and the latching block 51 on the left side abuts the corresponding one. The positioning surface 613 is engaged to the ratchet 3. At this time, the ratchet 3 can only rotate in one direction and clockwise. The user can switch the rotatable direction of the ratchet wheel 3 by pulling the toggle switch 612 according to operational needs.

Thus, the embodiment adopts the cam block 611 of another configuration, such that the direction in which the toggle switch 612 switches the ratchet 3 to rotate smoothly and counterclockwise is opposite to the first embodiment. Therefore, by changing the configuration of the cam block 611, it is possible to satisfy each user of a different dominant hand.

Referring to Figures 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 latching block 51 and the switching unit 6.

Each of the latching blocks 51 also has a recess 513. Each groove 513 is formed on a side of each of the latching blocks 51 adjacent to the pivot hole 212. The cam block 611 of the switching unit 6 has two pushing surfaces 614 which are respectively located on the left and right sides and protrude outwardly, and each pushing surface 614 is slightly curved. The toggle switch 612 has a disk portion 615 and a trigger portion 616 extending from the disk portion 615 in a direction perpendicular to the axis L2. The chute 62 has a circular arc shape, and its center is located on the axis L2. The stop block 63 is formed at an angle between the disk portion 615 and the cam block 611, and has a circular arc shape with a center of the circle on the axis L2, and a maximum arc length of the arc of the chute 62 is 1 /2 to 1/4. In this embodiment, the arc length of the stop block 63 is about 1/2 of the arc length of the chute 62.

The disk portion 615 has a first radius R1 that is greater than a second radius R2 of the outer circumference of the sliding slot 62. Therefore, after the switching member 61 is mounted to the pivot hole 212, the disk portion 615 can cover the sliding slot 62. And pulling the trigger portion 616 to any angle, the disk portion 615 can prevent the sliding groove 62 from communicating with the outside, thereby preventing fine particles such as dust or debris from entering the sliding groove 62, thereby preventing fine particles such as dust or debris from entering the sliding groove 62. The switching of the switching member 61 is maintained smoothly and the block 63 is prevented 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 the width of the first embodiment. Thus, by increasing the width, the blocking block 63 and the sliding slot 62 can be improved. The contact area can support the switching member 61 more stably, so as to avoid the switching member 61 from shaking and deviating from the predetermined position during assembly.

Referring to FIG. 14 and FIG. 15, the groove 513 on each of the latching blocks 51 is for the corresponding pushing surface 614 to be pushed against the merged position. The cam block 611 is rotated by the triggering portion 616, and is pushed against one of the latching blocks 51, and finally is engaged in the recess 513 of the latching block 51 that is pushed up and Positioning, whereby the latched block 51 that is pushed against is not engaged with the ratchet 3. When the blocking block 63 abuts against one of the left stopping surface 621 and the right stopping surface 622 of the sliding slot 62, one of the rod teeth 511 is engaged with the ratchet 3 The ratchet portion 31 does not engage the ratchet portion 31. Details of switching the switching member 61 to switch the rotatable direction of the ratchet 3 have been disclosed in detail in the first embodiment and will not be described herein.

Thus, the present embodiment not only has the same functions as the first embodiment, but also increases the width of the cam block 611 to avoid the switching member 61 from deviating from the predetermined position due to shaking during assembly, and then transmitting through another configuration. The engagement of the cam block 611 and the latching blocks 51 allows the abutting faces 614 of the cam block 611 to be securely positioned on the latching blocks 51.

Referring to Figures 16 and 17, a fourth embodiment of a ratchet wrench of the present invention is substantially the same as the third embodiment except for the position of the chute 62 and the stop block 63.

The position of the sliding slot 62 is defined by 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. The length of the stop block 63 matches the depth of the chute 62. In the present embodiment, the depth of the chute 62 is 2.5 mm, and the length of the stopper 63 is approximately equal to 2.5 mm.

In a preferred manufacturing method, the head 21 is first milled out of the pivot hole 212, and a hole (not shown) is drilled in the side, and then the stopper 63 is fastened into the hole. (not shown). The chute 62 is constructed by turning the disc portion 615 directly.

In this way, the chute 62 and the stop block 63 are disposed in another manner in this embodiment, and the user can select according to the needs thereof.

In summary, the ratchet wrench of the present invention can prevent the ratchet 3 from being effectively engaged by the excessive rotation of the switching member 61 through the cooperation of the sliding groove 62 and the stopping block 63, and the blocking block 63 can be avoided. Wear and thereby increase the service life, so the object of the present invention can be achieved.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

1‧‧‧ Ratchet Wrench
11‧‧‧ head
111‧‧‧ 容容
112‧‧‧ recessed area
113‧‧‧Pivot hole
114‧‧‧stop surface
115‧‧‧Inside
116‧‧‧Outside
12‧‧‧ ratchet
13‧‧‧Carmen unit
131‧‧‧ card block
132‧‧‧Flexible parts
14‧‧‧Switching parts
141‧‧ ‧ cam block
142‧‧‧Toggle switch
2‧‧‧ Ontology
21‧‧‧ head
211‧‧‧ 容容
212‧‧‧ pivot hole
22‧‧‧ handle
3‧‧‧ratchet
31‧‧‧ ratchet
4‧‧‧ Drives
5‧‧‧Cart unit
51‧‧‧ card block
511‧‧‧ rodent
512‧‧‧ pivotal department
513‧‧‧ Groove
52‧‧‧Flexible parts
6‧‧‧Switch unit
61‧‧‧Switching parts
611‧‧‧ cam block
612‧‧‧Toggle switch
613‧‧‧ positioning surface
614‧‧‧Affected
615‧‧‧Parts
616‧‧‧Traction
62‧‧‧ chute
621‧‧‧Left stop surface
622‧‧‧right stop surface
63‧‧‧ block
L1‧‧‧ self-axis
L2‧‧‧ axis
R1‧‧‧ first radius
R2‧‧‧ second radius

Other features and advantages of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is a perspective view of a conventional ratchet wrench; FIG. 2 is a cross-sectional view along line II-II of FIG. It is indicated that a toggle switch of the ratchet wrench is turned to the left side and abuts against a stop surface; FIG. 3 is a view similar to FIG. 2, illustrating that the toggle switch is toggled to the right side and leans against the other Figure 4 is a partial cross-sectional view showing the toggle switch and the stop surface; Figure 5 is a perspective view showing the toggle switch of the ratchet wrench moving beyond a recessed area; Figure 5 is a cross-sectional view of the line VI-VI, illustrating a cam block over-rotating so that the two-clamp block of the ratchet wrench does not engage a ratchet; Figure 7 is an exploded perspective view of the ratchet wrench of the present invention FIG. 8 is a partially exploded perspective view showing a switching member and a sliding slot of the first embodiment; FIG. 9 is a partial cross-sectional view showing a blocking block of the first embodiment a right stop surface of the chute, limiting a toggle switch FIG. 10 is a view similar to FIG. 9 , illustrating that the stop block of the first embodiment abuts against a left stop surface of the chute, restricting the toggle switch from continuing to clockwise. Figure 11 is a partial cross-sectional view showing the second embodiment of the ratchet wrench of the present invention. The stop block abuts against the left stop surface of the chute, restricting a toggle switch from continuing to rotate clockwise. And FIG. 12 is a view similar to FIG. 11, illustrating that the stop block of the second embodiment abuts against the right stop surface of the chute, restricting the toggle switch from continuing to rotate counterclockwise. Figure 13 is a partial exploded view showing a switching unit of a third embodiment of the ratchet wrench of the present invention; Figure 14 is a partial cross-sectional view showing the stop block of the third embodiment abutting against the right of the chute a stop surface, restricting a toggle switch from continuing to rotate counterclockwise; 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 chute, Limiting the toggle switch to continue to rotate clockwise; FIG. 16 is a partially exploded perspective view showing a body and a switch member of a fourth embodiment of the ratchet wrench of the present invention; and FIG. 17 is a partially exploded view showing the fourth The chute and the stop block of the embodiment.

Claims (9)

A ratchet wrench includes: a body, a head having a receiving slot, and a pivot hole connecting the outside and the receiving slot; a ratchet pivotally disposed in the receiving slot of the body And comprising a ratchet portion surrounding the axis thereof; a latching unit comprising a second latching block and two elastic members, wherein the latching blocks are pivotally disposed on the two slots on the left and right sides of the pivot hole, respectively Each of the latching blocks has a toothed portion detachably engaged with the ratchet portion, each resilient member abutting between the respective latching block and the inner wall of the receiving slot; and a switching unit including a a switching member, a sliding slot, and a blocking block, the switching member has a cam block and a toggle switch, the cam block is located between the latching blocks and passes through the pivoting hole, the toggle switch position On the outside of the body, and formed at the end of the cam block, the toggle switch is operable to spin the cam block and push against one of the card blocks to allow the card to be pushed The rod portion of the block does not engage the ratchet portion of the ratchet, and the toggle switch of the switching member covers the chute, so that the The movable switch does not allow the sliding slot to communicate with the outside when the movement is switched. The sliding slot is opened in one of the head and the switching member, and is adjacent to the pivot hole and extends in the left-right direction. The sliding slot has a a left stop surface and a right stop surface, the stop block is disposed on the other of the head and the switching member, and protrudes into the sliding slot, when the blocking block abuts against the sliding slot The When one of the left stop surface and the right stop surface, one of the rod teeth engages the ratchet portion of the ratchet while the other does not engage the ratchet portion. The ratchet wrench of claim 1, wherein the chute is opened in the switching member, and the blocking block is disposed on the head. The ratchet wrench of claim 1, wherein the chute is opened at the head, and the stop block is disposed at the switching member. A ratchet wrench according to any one of claims 1 to 3, wherein the depth of the chute is greater than 1 mm and the length of the stop block is greater than 1 mm. The ratchet wrench according to any one of claims 1 to 3, wherein the cam block of the switching member has an axis passing through a center of the pivot hole, the sliding groove has a circular arc shape, and the center of the circle is located On the axis. The ratchet wrench of claim 5, wherein the stop block has a shape of a circular arc whose center is on the axis, and a maximum arc length of 1/2 to 1/4 of the arc length of the chute. The ratchet wrench according to any one of claims 1 to 3, wherein the cam block has two positioning faces respectively located on the left and right sides, and two pushing faces respectively located on the left and right sides, the positioning faces being away from the ratchet wheel, The pushing surface is adjacent to the ratchet wheel, and when one of the pushing surfaces is pushed against the corresponding latching block, the rod portion of the latching block that is pushed against does not mesh with the ratchet portion . The ratchet wrench according to any one of claims 1 to 3, wherein the cam block has two positioning faces respectively located on the left and right sides, and two pushing faces respectively located on the left and right sides, the positioning faces being adjacent to the ratchet wheel, The push surface is away from the spine The wheel, when one of the pushing surfaces is pushed against the corresponding latching block, the rod portion of the latching block that is pushed against does not engage the ratchet portion. The ratchet wrench according to any one of claims 1 to 3, wherein the cam block has two pushing surfaces respectively located on the left and right sides, each of which is convexly curved outwardly and slightly curved, each of the latches The block also has a recess formed in a side adjacent the pivot hole, the recess being positioned for the corresponding abutment surface.