CN103286717A - Reversing ratchet wrench - Google Patents

Abstract

The present invention provides a ratchet wrench, comprising: a head defining a first compartment and a space; a drive head including an annular drive tooth received in the first compartment; a first pawl and a second pawl each having a plurality of ratchet teeth for engaging the annular drive teeth, the pawls being stacked for receipt in the space; the first and second detents are simultaneously movable laterally between first and second sides of the space by a direction knob of the wrench; when the first and second latches are located on the first side of the space, the wrench is idle-pulled back in a first direction, and when the first and second latches are located on the second side of the space, the wrench is idle-pulled back in a second direction; the ratchet teeth of the first pawl and the ratchet teeth of the second pawl have a tooth difference such that only one of the first pawl and the second pawl engages the annular drive tooth portion and the other one abuts the annular drive tooth portion; when the wrench is idle drawn back, the ratchet teeth of the first pawl and the ratchet teeth of the second pawl alternately engage the annular drive tooth portion.

Description

Reversing ratchet wrench

technical field

The invention relates to a reversing ratchet wrench, in particular to a reversing ratchet wrench capable of reducing the rotation angle required for idling.

Background technique

In the technical field of hand tools, ratchet wrench (ratchet wrench) has brought great convenience to users. The ratchet wrench can provide the user with the function of idling and pulling back without disengaging the wrench from the fastener in the space where the operation is limited, so as to improve the working efficiency. The development of the ratchet wrench has been a fairly mature technology so far, so a reversible ratchet wrench has also been developed. These reversible ratchet wrenches usually adjust the idling pull-back direction of the wrench through a toggle on the wrench, so this kind of wrench can provide two rotation directions at the same time without flipping the face. more convenient for the There are many patent publications in this technical field of ratchet wrench, which belongs to crowded technical field (crowded art). For example, Taiwan Invention Publication No. I350231 discloses a reversible ratchet wrench that avoids chipping, US Patent Publication No. US6918323B2 provides a reversible ratchet wrench with an improved pawl, and so on.

However, today's reversible ratchet wrenches still have their disadvantages. For example, in an extremely limited operating space, the angle of the wrench’s idling pull-back is also extremely limited, so that the number of ratchets that the wrench catch can skip during the idling pull-back is less, making the user have to increase the number of rotating fasteners/ The number of times of idling and pulling back can complete the work, resulting in low work efficiency. In addition, when the conventional ratchet wrench is operated by the user instantly and vigorously, the ratchet and the pawl still cannot cooperate to rotate at the same time and maintain a relative positional relationship, causing the ratchet and the pawl to slip relative to each other instantly and loosen, resulting in damage to the wrench. It may even lead to work hazards.

In view of this, it is necessary to provide a ratchet wrench that can improve work efficiency in a very limited operating space, and at the same time ensure that the relative positional relationship between the ratchet and the catch can remain unchanged under any use status.

Contents of the invention

An object of the present invention is to provide a ratchet wrench which can improve working efficiency in a limited operating space.

Another object of the present invention is to provide a ratchet wrench which can ensure that the relative positional relationship between the ratchet and the catch does not change under any use conditions.

According to one aspect of the present invention, the present invention provides a ratchet wrench, comprising: a head, the head defines a first compartment and a space below the first compartment, the space and the The first compartment communicates; a driving head includes an annular driving tooth portion, and the annular driving tooth portion is accommodated in the first compartment; a first detent and a second detent have respectively A plurality of ratchets for engaging the ring-shaped driving teeth, and the pawls are stacked to be accommodated in the space; wherein the first pawl and the second pawl are connected by one of the wrench The direction switch can move laterally between the first side and the second side of the space at the same time; wherein when the first detent and the two detents are located on the first side of the space, the wrench can Idling and pulling back in a first direction, when the first detent and the two detents are located on the second side of the space, the wrench can be idling and pulled back in a second direction; wherein the first The ratchet of the pawl and the ratchet of the second pawl have a tooth difference, so that only one of the first pawl and the second pawl engages the ring-shaped driving teeth, and the other one abuts against Relying on the ring-shaped driving teeth; wherein when the wrench idles and pulls back, the ratchets of the first pawl and the ratchets of the second pawl mesh alternately with the ring-shaped driving teeth.

According to another aspect of the present invention, the space of the ratchet wrench provided by the present invention further includes a second compartment for accommodating the direction dial, and the direction dial further includes a first abutting rod and A second abutting rod, one end of the abutting rod is respectively accommodated in a groove of the direction dial through a first elastic member and a second elastic member, and the other end of the abutting rod is respectively resist the first detent and the second detent. In addition, the inner wall of the second compartment has a blind hole, and a third abutting rod is inserted into the blind hole through a third elastic member, and the third abutting rod elastically abuts against the direction A rear surface of the dial.

The invention will be further described with reference to the accompanying drawings, which schematically show preferred embodiments according to the invention. It should be understood that the present invention is limited in all respects to the preferred embodiments.

Description of drawings

Fig. 1 is the exploded view of the parts of the reversing ratchet wrench according to the present invention;

Figure 2 is a partially enlarged view of Figure 1;

Fig. 3a and Fig. 3b respectively depict the three-dimensional structure diagram and the bottom view of the latch 40;

FIG. 3c and FIG. 3d respectively depict a three-dimensional structure diagram and a bottom view of the latch 42;

4a and 4b are schematic diagrams of the structure of the detent installed, the driving head assembly 20 and the direction dial 30;

5a and 5b are structural schematic diagrams of the ring-shaped driving teeth of the latch engaging the driving head;

6a and 6b are schematic structural views of the wrench with the direction switch in the first position and the second position, respectively, according to the present invention.

[Description of main component symbols]

1 Ratchet wrench

10 handle

12 head

121 Surface

123 Surface

125 The first compartment

127 Second Compartment

129 middle part

131 blind hole

133 Ejector rod

135 Containers

137 Elastic parts

1291 inner wall

1292 inner wall

20 Drive head assembly

22 Pressure rod

24 drive head

222 steel ball

224 Elastic parts

242 Ring drive gear

244 drive end

246 Through-hole

248 Perforation

250 steel balls

30 Direction dial

32 lever

34 center column

36 Bottom plate

342 space

344 Groove

346 rear surface

382 Elastic parts

384 Ejection rod

386 Containers

40 catch

42 catch

402 spine

404 sliding surface

406 Arresting surface

408 abutment surface

410 Corner

412 ratchet

414 recessed seat

416 Notch

422 spine

424 sliding surface

426 Arriving at the top surface

428 abutment surface

430 Corner

432 Ratchet

434 recessed seat

50 Sealing plate

52 hoop

501 opening

503 O-ring

505 O-ring

a Axis

b Center Axis

Detailed ways

FIG. 1 shows an exploded view of parts of the reversing ratchet wrench 1 of the present invention, wherein the ratchet wrench 1 has a handle 10 and a head 12 connected to one end of the handle 10 . To facilitate the understanding of the structure of the head 12, the head 12 shown in FIG. 1 is a partial cross-sectional view. A first compartment 125 and a second compartment 127 passing through the head 12 are defined on a surface 121 of the head 12 . The first compartment 125 and the second compartment 127 communicate with each other through an intermediate portion 129 (see FIG. 5 a ), so the second compartment 127 and the intermediate portion 129 can jointly form a compartment located below the first compartment 125. of a space. The first compartment 125, the second compartment 127 and the intermediate portion 129 form a cavity in the surface 123 of the head 12 opposite to the surface 121 (see FIG. 5a ) in which parts can be accommodated.

The first compartment 125 is used for accommodating a driving head assembly 20 , and the driving head assembly 20 includes a pressing rod 22 and a driving head 24 . The driving head has an annular driving tooth portion 242 and a driving end 244 protruding from the annular driving tooth portion 242. The driving head 24 forms a through hole 246 along the axial direction, and the through hole 246 can be accommodated sequentially from bottom to top. An elastic member 224 , a steel ball 222 and the pressure rod 22 . A perforation 248 communicating with the through hole 246 is formed radially on a surface of the driving end 244 for accommodating a steel ball 250, and the perforation 248 is configured such that the steel ball 250 can only partially be exposed in the perforation 248 at most beyond the surface where it is located. Thereby, when the pressing rod 22 is in an unpressed position, the elastic member 224 abuts against the steel ball 222 so that it is located in the through hole 246 flush with the steel ball 250 in the through hole 248, and at this moment the steel ball 222 forces The steel ball 250 presses against the through hole 248 to be partially exposed on the surface opening of the driving end 248 , and at this time, the external force cannot press the steel ball 250 into the through hole 248 . And when the pressure rod 22 is pressed down to reach the pressing position, the pressure rod 22 and the steel ball 222 compress the elastic member 224, causing the steel ball 222 to leave the position where the through hole 246 is flush with the perforation 248. At this time, the steel ball 250 can be retracted due to external force. The through hole 248 is blocked by the pressure rod 22 so as not to completely fall into the through hole 246 , but only partly located in the through hole 246 . In this way, the operator can insert the drive head assembly 20 into the known sleeve by pressing the pressing rod 22, and then release the pressing rod 22 so that the steel ball 250 engages with the corresponding recess in the conventional sleeve structure, To facilitate the locking or loosening of a fastener.

Certainly, the driving end 244 of the driving head 24 is not necessarily the type shown in FIG. Tool head type. Or the driving head 24 may not have a driving end protruding from the head 12, and members such as the pressure rod 22 and the steel ball 224, but instead form a driving hole inside the ring-shaped driving tooth 242 (that is, the through hole 246), The drive hole can be in the form of a Torx wrench or any other wrench drive hole suitable for screwing/loosening existing fasteners.

FIG. 2 is a partially enlarged view of FIG. 1 , wherein the direction switch 30 includes a top lever 32 , a center column 34 and a bottom plate 36 . The direction switch 30 is accommodated in the second compartment 127 , and the top lever, the center column 34 and the bottom plate 36 can be integrally formed. The direction dial 30 can be moved between a first position and a second position as shown in FIGS. 6 a and 6 b by turning the top shift lever 32 to define a first idle direction and a second idle direction of the wrench. The front side of the central column 34 facing the first compartment 125 is retracted relative to the bottom plate 36, so that there is a retracted space 342 above the front side of the bottom plate 34, and the retracted central column 34 at the front side further has a groove 344. (see Fig. 4b), after the elastic parts 382 are respectively inserted into the rear pockets 386 of the said abutting rods 384, the two abutting rods 384 stacked up and down are inserted into the groove 344, whereby the elastic parts 382 In an uncompressed state, it abuts against the bottom wall of the groove 344 , and the abutting rod protrudes out of the groove 344 . The rear side of the center column 34 defines a rear surface 346 , which can be an arc surface corresponding to the curve of the wall surface of the second compartment 127 . A blind hole 131 is formed on the inner wall surface of the second compartment 127 near the side of the handle 10, and after an elastic member 137 is inserted into the rear cavity 135 of a push rod 133, the push rod 133 is inserted in the blind hole 131 , whereby the elastic member 138 abuts against the bottom wall of the blind hole 131 in an uncompressed state, and the abutting rod 133 protrudes outside the blind hole 131 . When the direction switch 30 is installed in the second compartment 127, the abutment rod 133 needs to be pressed down so that the rear surface 346 of the center column 34 of the direction switch 30 abuts against the abutment rod 133, and after installation The push rod 133 is able to abut against the rear surface 346 at any time by the elastic force of the elastic member 137 and exert an abutting force.

FIG. 3 a and FIG. 3 b respectively show a three-dimensional structural view and a bottom view of the latch 40 . As shown in the figure, the pawl 40 has a plurality of ratchets 412, which generally extend toward both sides and present an arc shape that can define a radius. The ratchets 412 can be continuously covered on one side of the pawl 40, or can be arranged only on all sides. part of the length of the side. The pawl 40 forms a recess 414 on the other side relative to the plurality of ratchets 412. The center of the recess 414 may protrude only slightly to form a ridge 402, which is approximately bilaterally symmetrical with the ridge 402 as the axis. . The recess 414 extends from the ridge 402 to both sides, and defines the sliding surface 404 and the abutting surface 406 in sequence, and then forms the corner 410 . Two outer edges of the latch 40 form abutting surfaces 408 , and a notch 416 is formed at the bottom.

FIG. 3c and FIG. 3d respectively show a three-dimensional structural view and a bottom view of the latch 42 . As shown in the figure, the pawl 42 has a plurality of ratchets 432, which generally extend toward both sides and present an arc shape that can define a radius. The ratchets 432 can be continuously covered on one side of the pawl 42, or can only be arranged on all sides. part of the length of the side. The catch 42 forms a recess 434 on the other side of the plurality of ratchets 432 . The center of the recess 434 protrudes slightly to form a ridge 422 , which is approximately bilaterally symmetrical with the ridge 422 as an axis. The recess 434 extends from the ridge 422 to both sides, and defines the sliding surface 424 and the abutting surface 426 in sequence, and then forms the corner 430 . Two outer edges of the latch 42 form abutting surfaces 428 .

The profile of the recess 414 of the detent 40 may be substantially the same as the profile of the recess 434 of the detent 42 . However, the ratchet 412 of the detent 40 is configured with a tooth difference from the ratchet 432 of the detent 42 . For example, the ratchet 412 of the pawl 40 is a crest on the central axis a passing through the ridge 402, and the ratchet 432 of the pawl 42 is a valley on the central axis b passing through the ridge 422, so both The ratchet configuration has a half pitch difference. In addition, the lengths of the ratchet teeth of the latch 40 and the latch 42 may be the same or different. In other words, the numbers of the ratchet teeth of the two are not necessarily the same, or the lengths of the detent 40 and the detent 42 extending from the central axis in an arc shape on both sides are different.

According to FIG. 1 , the detent 42 is stacked on top of the detent 40 and mounted to the annular drive tooth 242 of the drive head 24 of the drive head assembly 20 in the first compartment 125 and the second compartment 127 Between the center columns 34 of the direction dial 30 in the center. In other words, the installed detents 40 and 42 are located in the middle portion 129 communicating with the first compartment 125 and the second compartment 127 . 4a and 4b are structural schematic diagrams of the detent assembly, the driving head assembly 20 and the direction dial 30 after being installed. As shown in the figure, after the detents 40 and 42 are stacked and installed on the head of the wrench, the recesses 414 and 434 respectively press against the abutting rod 384 of the direction dial 30 and compress the elastic member 382 . Therefore, the elastic member 382 can apply elastic force to the abutting rod 384, causing the abutting rod 384 to abut the recesses 414 and 434 toward the direction of the first compartment 125 (see FIG. 5 a ), so that the latches 40 and 42 abut The annular drive tooth portion 242 . At this time, because the ratchets 412 and 432 have a tooth difference, one of the ratchets 412 and 432 of the pawls 40 and 42 will engage the ring-shaped driving tooth portion 242, and the other will abut against the ring-shaped driving tooth portion 242. rather than engaging with it. In the state shown in FIGS. 4 a and 4 b , the ratchet 412 of the pawl 40 engages the ring-shaped driving tooth portion 242 , while the ratchet 432 of the pawl 42 abuts against the ring-shaped driving tooth portion 242 and does not mesh with it. . Of course, it is also possible that the ratchet 432 of the latch 42 engages with the ring-shaped driving tooth portion 242 , and the ratchet 412 of the latch 40 abuts against the ring-shaped driving tooth portion 242 (as shown in FIG. 5 b ). In other words, in the wrench of the present invention, only one of the ratchet teeth of the detents 40 and 42 engages with the ring-shaped driving tooth portion 242 at the same time point. It should be noted that the notch 416 of the detent 40 can just correspond to the bottom plate 36 of the direction switch 30 after the detent is installed, so as to prevent the bottom plate 36 from being damaged when the direction switch 30 moves between the first position and the second position. Interfere with detent 40 .

After the detents 40 and 42 are installed on the wrench head 12, the structural body of the wrench 1 is roughly completed. At this time, the cover plate 50 with an opening 501 can cover the first compartment 125, the second compartment 127 and the middle part 129 of the wrench head 12 in the recess formed in the surface 123 of the head 12 opposite to the surface 121, And the driving end 244 of the driving head assembly 20 is exposed through the opening 501 . A hoop 52 is further installed on the sealing plate 50 and abuts against the top edge of the side wall of the first compartment 125 to fix the sealing plate 50 . In order to reduce the surface friction between the driving head 242 , the head 12 and the sealing plate 50 , O-rings 503 and 505 may be placed on the upper surface and the lower surface of the driving head 242 respectively.

Due to the tooth difference between the detents 40 and 42 , the ratchet wrench 1 disclosed in the present invention can reduce the rotation angle. FIGS. 5 a and 5 b are structural schematic diagrams of the latch 40 and the latch 42 engaging the ring-shaped driving tooth portion 242 of the driving head 24 , respectively. In Fig. 5a, the direction toggle button 30 is located at the first position, and the elastic member 382 exerts elastic force to push against the push rod 384, so that it abuts against the abutting surface 406 on the side of the recess 414 of the detent 40, so that The abutment surface 408 of the side detent 40 is forced against the side wall 1291 of the middle portion 129 when the ratchet 412 of the detent 40 engages the annular drive tooth 242 . Yet another elastic member 382 exerts elastic force on another abutting rod 384 to push the abutting surface 426 on one side of the recess 434 of the detent 42, thereby making the abutting surface 428 of the detent 42 on the same side It also presses against the side wall 1291 of the middle part 129 . However, due to the tooth difference between the ratchet teeth of the catch 42 and the ratchet teeth of the catch 40 , the ratchet teeth 432 of the catch 42 do not engage the ring-shaped driving teeth 242 , and the catch 42 and the catch 40 are slightly staggered.

When the ratchet wrench 1 shown in FIG. 5a rotates clockwise, because the abutting surface 408 of the pawl 40 abuts against the side wall 1291, the ratchet 412 continues to engage the ring-shaped driving tooth portion 242, thereby driving the driving end and the fastening rotation of the piece. Conversely, when the ratchet wrench 1 rotates in the counterclockwise direction, the ring-shaped driving tooth portion 242 pushes the detents 40 and 42 toward the direction against the ejector rod 384, so that the detents 40 and 42 reversely press against the ejector rod 384 and the spring. Part 382, while reaching the ratchet wrench 1 idle back pull.

Similarly, in FIG. 5b, the direction switch 30 is also in the first position, and the elastic member 382 exerts elastic force to push against the push rod 384, so that it abuts against the abutting surface 426 on the side of the concave seat 434 of the detent 42, and then The abutting surface 428 of the pawl 42 on the same side is pressed against the side wall 1291 of the middle portion 129 , and the ratchet 432 of the pawl 42 engages the ring-shaped driving tooth portion 242 at this moment. Yet another elastic member 382 exerts elastic force on another abutting rod 384 to push the abutting surface 406 of one side recess 414 of the detent 40, so that the abutting surface 408 of the detent 40 on the same side is the same. Pressed against the side wall 1291 of the middle portion 129 . However, due to the tooth difference between the ratchet teeth of the catch 40 and the ratchet teeth of the catch 42 , the ratchet teeth 412 of the catch 40 do not engage the ring-shaped driving teeth 242 , and the catch 40 and the catch 42 are slightly staggered.

When the ratchet wrench 1 shown in FIG. 5b rotates clockwise, because the abutment surface 428 of the pawl 42 abuts against the side wall 1291, the ratchet 432 continues to engage the ring-shaped driving tooth portion 242, thereby driving the rotation of the fastener. . Conversely, when the ratchet wrench 1 rotates in the counterclockwise direction, the ring-shaped driving tooth portion 242 pushes the detents 40 and 42 toward the direction against the ejector rod 384, so that the detents 40 and 42 reversely press against the ejector rod 384 and the spring. Part 382, while reaching the ratchet wrench 1 idle back pull.

It should be noted that, in the present invention, the tooth difference between the ratchet teeth of the latch 40 and the ratchet teeth of the latch 42 may be half a tooth pitch. Therefore, when the ratchet wrench in FIG. There is half a tooth pitch difference, so the ratchet 432 of the pawl 42 engages the ring-shaped driving tooth portion 242, and becomes the state shown in FIG. In other words, during the idling pull-back process of the wrench, the detent 40 and the detent 42 are alternately engaged with the ring-shaped driving tooth portion 242 every half tooth pitch. The advantage of this structure is that, compared with the reversing ratchet wrench with only a single pawl, the reversing ratchet wrench of the present invention can effectively save the angle of idling pullback. In detail, only a ratchet wrench with a single pawl must be drawn at an angle of one tooth pitch to make the pawl jump and engage the next tooth of the ring-shaped drive tooth when the ratchet wrench is pulled back at idle, while the ratchet wrench of the present invention only needs to Pulling back an angle of half a pitch snaps the pawl into engagement with the next tooth of the ring drive tooth. For example, when there are 60 teeth in the ring-shaped driving teeth, the ratchet wrench with a single pawl must be pulled back 6° to jump over a tooth of the ring-shaped driving teeth, but the wrench of the present invention only needs to pull back 3° to jump over one tooth. Skip a tooth of the ring drive tooth section. Therefore, the effect of the structure of the present invention is equivalent to the effect of the ring-shaped driving tooth portion having 120 teeth under the structure of a single latch wrench. The angle required by the wrench of the invention to pull back and engage the ring-shaped driving tooth part is half of that of a single latch structure, so the operation efficiency can be effectively improved. In addition, because the structure of the present invention can save the stroke of idling and pulling back, it is particularly beneficial to use when the spanner operating space is narrow.

6a and 6b are schematic structural views of the wrench with the direction switch 30 in the first position and the second position, respectively, according to the present invention. In FIG. 6a, the direction dial 30 in the first position pushes the detents 40 and 42 to the first side of the space formed by the middle part 129 and the second compartment 127, and the ratchet wrench 1 can rotate clockwise. Rotation transmits torque through detent 40 or 42 to rotate the fastener, and can be rotated counterclockwise for idle pullback. If you want to change the operating direction of the wrench 1, you only need to move the direction lever 38 to the second position as shown in Figure 6b, and the detents 40 and 42 in the head 12 of the ratchet wrench 1 can be moved laterally to the position shown in Figure 6b. In the position shown in (that is, at a second side relative to the first side of the space formed by the middle part 129 and the second compartment 127), the wrench 1 can be rotated counterclockwise by the detent 40 or 42 transmits torque to rotate the fastener and can be turned clockwise for lost motion pullback. In detail, when the direction switch 30 is at the first position, the abutting rod 384 respectively pushes the abutting surface 406 of the detent 40 and the abutting surface 426 of the detent 42, so that the abutting surface on one side of the detent 40 408 and the abutting surface 428 on the same side of the latch 42 abut against the inner wall 1291 of the middle portion 129 of the head 12 (for ease of illustration and understanding, the abutting surface 426 and the abutting surface 428 of the latch 42 are not marked in FIG. 6a middle). At this time, the corners 410 and 430 of the latch 40 and the latch 42 relative to the inner wall 1291 are located in the retracted space 342 of the center column 34 . When the direction switch 30 is toggled from the first position to the second position, the abutting rod 384 is from the abutting surfaces 406 and 426 on one side of the latch 40 and the latch 42, respectively, along the wall edges of the recesses 414 and 434. Slide through sliding surfaces 404 and 424, ridges 402 and 422, and then through sliding surfaces 404 and 424 on opposite sides of detent 40 and detent 42 to abutment surfaces 406 and 426 on opposite sides (as shown in FIG. 6b). During the sliding process of the abutting rod 384 along the recess of the pawl, the pawls 40 and 42 are simultaneously displaced from the position shown in FIG. In the position shown in FIG. 6 b , finally the abutting surfaces 408 and 428 on the other side of the pawls 40 and 42 abut against the inner wall 1292 of the middle part 129 relative to the inner wall 1291 , and the reversing action of the ratchet wrench 1 is completed. In FIG. 6 b , the corners 410 and 430 of the detents 40 and 42 relative to the inner wall 1292 are located in the retracted space 342 of the center post 34 . Since the ridges 402 and 422 of the detents 40 and 42 protrude slightly from the centers of the recesses 414 and 434 respectively, when the push rod 384 slides to the ridges 402 and 422, the toggle resistance of the direction switch 30 will be reduced. Slightly larger, and can obtain a clear commutation feel. In addition, during the movement of the direction toggle button 30, the displacement of the ratchet 412 of the pawl 40 and the ratchet 432 of the pawl 42 is still continuously engaged or abutting against the ring-shaped driving teeth of the driving head 20, so there will be no slippage occurs.

It is worth noting that, because the abutting rod 133 on the inner side wall surface of the second compartment 127 of the wrench head 12 of the present invention is close to the handle 10, it will abut against the direction at any time by the elastic force of the elastic member 138. The rear surface 346 of the center column 34 of the dial button 30 and exerts an abutment force, which can ensure that the abutting rod 384 of the direction dial 30 engages the pawls 40 and 42 or abuts against the annular drive tooth portion 242 of the drive head 24, It will not slip when stationary or during operation. Therefore, the structure of the present invention can prevent the conventional ratchet wrench from engaging or abutting against the ratchet wrench after long-term use, when changing directions, or when operating vigorously in an instant, so that the possibility of damage to the ratchet wrench can be avoided. , thus enhancing the security of operation.

The specific embodiments of the present invention are described above, but those skilled in the art can make any modifications and embellishments to the present invention without departing from the spirit of the present invention, but these modifications and embellishments still belong to the scope of the present invention. scope.

Claims (10)

1. A ratchet wrench, comprising: a head defining a first compartment and a space below the first compartment, the space communicating with the first compartment; a drive head comprising an annular drive tooth portion housed in the first compartment; A first pawl and a second pawl respectively have a plurality of ratchets for engaging the ring-shaped driving teeth, the first pawl and the second pawl are stacked to be accommodated in the space middle; wherein the first detent and the second detent can be moved laterally between the first side and the second side of the space at the same time by a direction dial of the wrench; Wherein when the first detent and the two detents are located on the first side of the space, the wrench can be idling and pulled back along a first direction, when the first detent and the two detents When located on the second side of the space, the wrench can be idling and pulled back along a second direction; wherein the ratchet teeth of the first pawl and the ratchet teeth of the second pawl have a tooth difference such that only one of the first pawl and the second pawl engages the annular drive tooth portion, and the other abuts against said annular drive tooth; Wherein when the wrench is idling and pulled back, the ratchets of the first pawl and the ratchets of the second pawl alternately mesh with the ring-shaped driving teeth. 2. The ratchet wrench of claim 1, wherein said space further comprises a second compartment for receiving said directional dial. 3. The ratchet wrench according to claim 1 or 2, wherein the direction dial further comprises a first abutment rod and a second abutment rod, and one end of the first abutment rod and the second abutment rod A first elastic member and a second elastic member are respectively accommodated in a groove of the direction toggle button, and the other ends of the first abutting rod and the second abutting rod respectively abut against the first detent and the second detent. 4. The ratchet wrench of claim 3, wherein said first pawl has a recess defining a central ridge, two opposing sliding surfaces extending from said central ridge, and extending from said two opposing sliding surfaces. Two opposing top surfaces extending relative to the sliding surface. 5. The ratchet wrench of claim 4, wherein the bottom of the first pawl has a notch. 6. The ratchet wrench of claim 3, wherein said second detent has a recess, said recess defining a central ridge, two opposing sliding surfaces extending from said central ridge, and extending from said two opposing sliding surfaces. Two opposite sides of the sliding surface extend against the top surface. 7. The ratchet wrench according to claim 4, wherein the first abutting rod of the direction dial abuts against the recess of the first pawl. 8. The ratchet wrench according to claim 6, wherein the second abutting rod of the direction dial abuts against the recess of the second detent. 9. The ratchet wrench according to claim 3, wherein the inner wall of the second compartment has a blind hole, a third abutting rod is inserted in the blind hole by a third elastic member, and the third The abutting rod elastically abuts against a rear surface of the direction toggle button. 10. The ratchet wrench according to claim 1 or 2, wherein the tooth difference between the ratchet teeth of the first pawl and the ratchet teeth of the second pawl is half a tooth pitch.

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