A reversing wrench

Abstract

This utility model discloses a reversing wrench, including a handle, a wrench head, a reversing mechanism, and a workpiece anti-disengagement mechanism. The wrench head includes a mounting shaft and a wrench head. The mounting shaft passes through the wrench head mounting hole in the handle head and is axially limited by an axial limiting mechanism. The outer circumferential surface of the mounting shaft is formed with at least one roller limiting surface. Each roller limiting surface forms a roller receiving cavity between itself and the wall of the wrench head mounting hole. The distance between the roller limiting surface and the wall of the wrench head mounting hole decreases from greater than the roller diameter to less than the roller diameter from the middle to both sides along the circumference of the wrench head mounting hole, forming two corresponding opposite force-bearing working positions. The roller driver of the reversing mechanism includes a dial part and a push claw part formed by powder metallurgy. The push claw part extends into the roller receiving cavity and is located on the side of the roller. An elastic element that abuts against the roller is wrapped on the side of the push claw part. The elastic element is formed by sheet metal stamping, which improves the strength and production efficiency of the reversing mechanism.

Description

Technical Field

[0001] This utility model pertains to hand tools, and particularly relates to a reversing wrench. Background Technology

[0002] There are various types of reversing wrenches on the market. One type of reversing wrench mainly includes a handle, a wrench head, and a reversing mechanism. One end of the handle is a handle head, which has a wrench head mounting hole for mounting the reversing mechanism. The wrench head is set in the wrench head mounting hole through a mounting shaft. The outer circumference of the wrench head mounting shaft is formed with a roller limiting surface. A roller receiving cavity with varying spacing is formed between the walls of the wrench head mounting hole. The roller receiving cavity accommodates rollers that can move circumferentially along the wrench head mounting hole within the roller receiving cavity. The width of the two sides of the roller receiving cavity is smaller than the diameter of the roller. When the roller is on the two sides of the roller receiving cavity, it simultaneously abuts against the wall of the wrench head mounting hole and the roller limiting surface, achieving circumferential limiting and being in the working position under force. When the roller is in the middle of the roller receiving cavity, the roller cannot simultaneously abut against the wall of the wrench head mounting hole and the roller limiting surface, and is in the reset free-spinning position, allowing the wrench to reset. The reversing mechanism uses a pusher pawl that extends into the roller housing cavity to shift the roller position, thus changing the wrench's operating direction. The pusher pawl is driven to change position by a rotating dial. The dial and pusher pawl are made of plastic injection molding as a single piece, which has relatively low strength and is easily damaged. Because the roller housing cavity has a certain width for its idle return, there is a certain distance between the working position and the reset idle position of the roller. This makes it easy for the wrench to have an idle stroke during the initial working process, causing the wrench to jump and bounce. Utility Model Content

[0003] The purpose of this utility model is to solve the defects of existing plastic reversing wrenches, which have relatively low strength and are prone to jumping and skipping when the wrench is under force. The present invention provides a reversing wrench that can eliminate jumping when the roller is under force and has a high strength of reversing mechanism.

[0004] Therefore, this utility model adopts the following technical solution: a reversing wrench, including a handle, a wrench head, and a reversing mechanism. One end of the handle is a handle head, and the handle head has a circular wrench head mounting hole for mounting the reversing mechanism. The wrench head includes a mounting shaft and a wrench head. The mounting shaft passes through the wrench head mounting hole and limits the axial position of the wrench head relative to the wrench head mounting hole by an axial limiting mechanism. The maximum outer diameter of the mounting shaft is smaller than the inner diameter of the wrench head mounting hole. At least one roller limiting surface is formed on the outer circumferential surface of the mounting shaft. Each roller limiting surface forms a roller receiving cavity with the wall of the wrench head mounting hole. A roller with the same axial direction as the wrench head is accommodated in the roller receiving cavity. The distance between the roller limiting surface and the wall of the wrench head mounting hole in the vertical direction of the roller limiting surface decreases from greater than the roller diameter to less than the roller diameter from the middle to both sides along the circumference of the wrench head mounting hole. When the distance is less than the roller diameter, a force-bearing working position is formed where the roller prevents the roller limiting surface from rotating relative to the inner wall of the wrench head mounting hole. Each roller... The roller limiting surface corresponds to two force-bearing working positions, and the two force-bearing working positions correspond to opposite wrench rotation. When the distance is greater than the roller diameter, a space is formed in which the roller limiting surface can rotate relative to the inner wall of the wrench mounting hole. The reversing mechanism includes a roller driver and a driver limiting mechanism. The roller driver includes a dial portion formed by powder metallurgy and a push claw portion. The push claw portion is integrally formed on the outer side of the bottom surface of the dial portion along the circumferential direction. The dial portion is fitted onto the top of the wrench head through a central through hole. The push claw portion extends into the roller receiving cavity and is located on the side of the roller. The thickness of the push claw portion is less than the difference between the inner diameter of the wrench mounting hole and the maximum outer diameter of the mounting shaft portion, allowing the push claw portion to move between the mounting shaft portion and the wall of the wrench mounting hole. An elastic element is provided on the side of the push claw portion facing the roller, and the elastic element abuts against the roller, ensuring that the roller is always in the force-bearing working position when under force, and that the roller presses against the elastic element to disengage from the force-bearing working position when the wrench is idling.

[0005] As a supplement and improvement to the above technical solution, this utility model also includes the following technical features.

[0006] The elastic element includes an integral mounting part and an elastic part. One elastic part is provided on each side of the mounting part, so that one push claw part corresponds to two rollers. The mounting part is formed into a locking groove that corresponds to and mates with the push claw part. The push claw part is locked in the locking groove to form a tight fit. The elastic parts are located on both sides of the push claw part. By rotating the dial part, the push claw part is moved between the mounting shaft part and the wall of the wrench mounting hole, so that the elastic parts on both sides of the push claw part can abut against one roller one after another, completing the reversal of the wrench's force operation.

[0007] Furthermore, a groove is provided on the outer side of the pushing claw so that the mounting part can be inserted into the groove, and the outer side of the mounting part will not be higher than the outer side of the pushing claw.

[0008] Preferably, the elastic element is formed by stamping and bending sheet metal, and the elastic part includes two elastic sheets that extend at both ends and are connected to the mounting part in the middle. The two elastic sheets are connected to form a V-shape, and the opening of the V-shape faces the roller.

[0009] The axial limiting mechanism includes a limiting sleeve with a central through hole and a first retaining ring groove on its outer circumferential surface. A second retaining ring groove, corresponding to the first retaining ring groove, is provided at the lower end of the wall of the wrench mounting hole. A first retaining ring is engaged in both the first and second retaining ring grooves to limit the axial position of the limiting sleeve relative to the wrench mounting hole. The mounting shaft of the wrench is a stepped shaft with a diameter greater than that at both ends in the middle section, forming an upper axial shoulder, a lower axial shoulder, an upper journal located above the upper axial shoulder, and a lower journal located below the lower axial shoulder. The roller limiting surface is located between the upper and lower axial shoulders. The lower journal passes through the central through hole of the limiting sleeve and has a third retaining ring groove. A second retaining ring is engaged in the third retaining ring groove. The wrench is axially limited by the lower axial shoulder and the second retaining ring, thus limiting the axial position of the wrench relative to the wrench mounting hole.

[0010] The driver limiting mechanism includes a fourth retaining ring groove, a third retaining ring, a ball, a first spring, a spring receiving groove disposed on the upper axial shoulder end face of the lever head, and a limiting groove disposed on the bottom surface of the dial portion. The fourth retaining ring groove is disposed on the upper journal of the lever head, and the third retaining ring is engaged in the fourth retaining ring groove and pressed against the top surface of the dial portion to limit the axial position of the driver. The first spring is housed in the spring receiving groove, and the ball is disposed on the top of the first spring. Each spring receiving groove corresponds to two limiting grooves. The two limiting grooves are disposed on both sides of the line connecting the center of the push claw portion and the bottom surface of the dial portion. The two limiting grooves correspond to two force-bearing working positions with opposite directions. When the push claw portion pushes the roller to the force-bearing working position, the ball is engaged in the limiting groove under the support of the first spring. The dial portion will not rotate without being driven by the rotational driving force, so that the push claw portion always provides a pushing force to the roller, keeping the roller always in the force-bearing working position.

[0011] Preferably, the top surface of the dial section has two dial protrusions for manually driving the dial section to rotate.

[0012] The reversing wrench further includes a workpiece anti-disengagement mechanism, which comprises a guide post, a steel ball, and a second spring. The wrench head has an axial central hole, which is a stepped hole, including a large-diameter spring receiving cavity and a small-diameter guide hole. The wrench head has a radial steel ball through hole that communicates with the guide section of the central hole. The diameter of the steel ball through hole is smaller than the diameter of the steel ball. The guide post is a stepped shaft, including a large-diameter head section and a small-diameter guide shaft section. The guide shaft section has a stepped groove. The guide post passes through the central hole of the wrench head. The steel ball is received in the stepped groove and passes through the steel ball through hole to the wrench head. The outer circumferential surface of the part protrudes, and the second spring is fitted into the guide shaft section and housed in the spring receiving cavity section of the central hole. It is limited by the axial end face of the central hole and the two ends of the shoulder of the guide post. The spring force axially supports the guide post, so that the bottom surface of the higher groove of the stepped shaft supports the steel ball, causing the steel ball to protrude from the steel ball through the steel ball through hole to the outer circumferential surface of the wrench head. When the wrench head is connected to the workpiece, the workpiece presses inward against the steel ball, and the steel ball rolls against the stepped groove, causing the guide post to move axially. The steel ball enters the lower bottom of the stepped groove, and the head of the guide post presses against the second spring to generate spring force. The spring force provides the restoring force of the guide post supporting the protruding steel ball after the wrench head is separated from the workpiece.

[0013] This invention can achieve the following beneficial effects: by using a metal powder metallurgy integral forming roller driver, and wrapping and fixing an elastic element on the roller pushing claw, the elastic element is formed by sheet metal stamping, which improves the strength of the reversing mechanism, reduces the manufacturing difficulty, improves production efficiency, and reduces costs. Attached Figure Description

[0014] Figure 1 This is a structural diagram of the main view of this utility model.

[0015] Figure 2 This is a top view of the structure of this utility model.

[0016] Figure 3 yes Figure 1 A sectional view along the AA direction.

[0017] Figure 4 yes Figure 1 BB-direction sectional view.

[0018] Figure 5 yes Figure 2 CC-direction sectional view.

[0019] Figure 6 yes Figure 2 DD section view.

[0020] Figure 7 This is a structural diagram of a roller actuator.

[0021] Figure 8This is a structural diagram of the wrench head. Detailed Implementation

[0022] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. The described embodiments are only for illustration and explanation of the invention and do not constitute the only limitation of the invention.

[0023] This utility model is a reversing wrench. For example... Figures 1-4 As shown, the reversing wrench includes a handle 1, a wrench head 2, a reversing mechanism, and a workpiece anti-disengagement mechanism. One end of the handle is a handle head, and the handle head has a circular wrench head mounting hole for mounting the reversing mechanism. The wrench head includes a mounting shaft portion 22 and a wrench head 21. The mounting shaft portion passes through the wrench head mounting hole and the axial position of the wrench head relative to the wrench head mounting hole is limited by an axial limiting mechanism.

[0024] The mounting shaft 22 of the wrench head 2 is a stepped shaft with a diameter in the middle section larger than that at both ends, forming an upper axial shoulder, a lower axial shoulder, an upper journal located above the upper axial shoulder, and a lower journal located below the lower axial shoulder. The maximum outer diameter of the mounting shaft 22 is smaller than the inner diameter of the wrench mounting hole. Six roller limiting surfaces 23 are formed on the outer circumferential surface of the mounting shaft. These roller limiting surfaces are located between the upper axial shoulder and the lower axial shoulder. Each roller limiting surface forms a roller receiving cavity with the wall of the wrench mounting hole, accommodating a roller 5 whose axial direction is the same as the wrench's axial direction. The distance between the roller limiting surface 23 and the wall of the wrench mounting hole in the vertical direction decreases from greater than the roller diameter to less than the roller diameter along the circumference of the wrench mounting hole from the center outwards. When the distance is less than the roller diameter, a force-bearing working position is formed where the rollers prevent the roller limiting surface from rotating relative to the inner wall of the wrench mounting hole. Each roller limiting surface corresponds to two force-bearing working positions, with the two force-bearing working positions corresponding to opposite wrench rotation directions. When the distance is greater than the roller diameter, a space is formed where the roller limiting surface can rotate relative to the inner wall of the wrench mounting hole, used for wrench free-spinning reset.

[0025] The axial limiting mechanism includes a limiting sleeve 11 with a central through hole. A first retaining ring groove is provided on the outer circumferential surface of the limiting sleeve. A second retaining ring groove corresponding to the first retaining ring groove is provided at the lower end of the wall of the wrench mounting hole. A first retaining ring 12 is engaged in the first and second retaining ring grooves to limit the axial position of the limiting sleeve relative to the wrench mounting hole. The top surface of the limiting sleeve serves as the bottom surface of the roller receiving cavity. The lower journal of the mounting shaft 22 passes through the central through hole of the limiting sleeve and is provided with a third retaining ring groove. A second retaining ring 13 is engaged in the third retaining ring groove. The wrench is axially limited by the lower journal against the shoulder and the second retaining ring, thereby limiting the axial position of the wrench relative to the wrench mounting hole.

[0026] The reversing mechanism includes a roller driver 3 and a driver limiting mechanism. The roller driver 3 includes a dial portion 33 formed by powder metallurgy and a pusher claw portion 32. The pusher claw portion 32 is integrally formed on the outer side of the bottom surface of the dial portion 33 along the circumferential direction. The top surface of the dial portion 33 has two dial protrusions 31 for manually driving the dial portion to rotate. The dial portion 33 is fitted onto the upper journal at the top of the wrench head 2 through a central through hole. The pusher claw portion 32 extends into the roller receiving cavity and is located on the side of the roller 5; the thickness of the pusher claw portion is less than the difference between the inner diameter of the wrench head mounting hole and the maximum outer diameter of the mounting shaft portion, enabling the pusher claw portion to move between the mounting shaft portion and the wall of the wrench head mounting hole.

[0027] An elastic element 8 is provided on the side of the push claw facing the roller. A groove is provided on the outer side of the push claw. The elastic element 8 includes an integral mounting part 82 and an elastic part 81. One elastic part is provided on each side of the mounting part, so that one push claw can correspond to two rollers. The mounting part is formed into a snap-fit ​​groove that corresponds to and mates with the push claw 32. The push claw 32 is snapped into the snap-fit ​​groove. The mounting part is snapped into the groove on the outer side of the push claw to form a tight fit. The elastic parts are located on both sides of the push claw. The elastic element is formed by stamping and bending sheet metal. The elastic part includes two elastic plates that extend at both ends and are connected to the mounting part in the middle. The two elastic plates are connected to form a V-shape. The opening of the V-shape faces the roller. The elastic plates abut against the roller, so that the roller is always in the working position when under force, and can also be released from the working position when the wrench is idling by pressing the elastic part. The rotation of the dial section drives the push claw section to move between the mounting shaft section and the wall of the wrench mounting hole, so that the elastic parts on both sides of the push claw section can successively abut against a roller, thus completing the reversal of the wrench's force operation.

[0028] The driver limiting mechanism includes a fourth snap ring groove, a third snap ring 15, a ball 14, a first spring 9, a spring receiving groove disposed on the upper axial shoulder end face of the lever head, and a limiting groove 34 disposed on the bottom surface of the dial portion. The fourth snap ring groove is disposed on the upper journal of the lever head, and the third snap ring 15 is engaged in the fourth snap ring groove and pressed against the top surface of the dial portion 33 to limit the axial position of the driver. The first spring 9 is housed in the spring receiving groove, and the ball 14 is disposed at the top of the first spring 9. Each spring receiving groove corresponds to two limiting grooves 34. The two limiting grooves are respectively disposed on both sides of the line connecting the center of the bottom surface of the push claw and the dial part. The two limiting grooves correspond to two force-bearing working positions with opposite directions. When the push claw pushes the roller to the force-bearing working position, the ball is stuck in the limiting groove under the support of the first spring. The dial part will not rotate without being driven by the rotational driving force, so that the push claw always provides a pushing force to the roller so that the roller is always in the force-bearing working position.

[0029] The workpiece anti-detachment mechanism includes a guide post 6, a steel ball 4, and a second spring 7. The wrench head 2 has an axial central hole, which is a stepped hole comprising a large-diameter spring receiving cavity and a small-diameter guide hole. The wrench head has a radial steel ball through-hole communicating with the guide hole, the diameter of which is smaller than the diameter of the steel ball 4. The guide post 6 is a stepped shaft, comprising a large-diameter head section and a small-diameter guide shaft section. The guide shaft section has a stepped groove. The guide post passes through the central hole of the wrench head, and the steel ball is housed in the stepped groove and protrudes to the outer circumferential surface of the wrench head through the steel ball through-hole. The second spring 7 is fitted onto the guide shaft section and housed in the spring receiving cavity section of the central hole. It is limited by the axial end face of the central hole and the two ends of the shoulder of the guide post. The spring force axially supports the guide post, causing the higher bottom surface of the stepped shaft to support the steel ball, which then protrudes through the steel ball through the steel ball through hole to the outer peripheral surface of the wrench head. When the wrench head is connected to the workpiece, the workpiece presses inward against the steel ball, and the steel ball rolls against the stepped groove, causing the guide post to move axially. The steel ball enters the lower bottom of the stepped groove, and the head of the guide post presses against the second spring, generating spring force. The spring force provides the restoring force for the guide post to support the protruding steel ball after the wrench head is separated from the workpiece.

Claims

1. A reversing wrench, comprising a handle, a wrench head, and a reversing mechanism, wherein one end of the handle is a handle head, the handle head having a circular wrench head mounting hole for mounting the reversing mechanism, the wrench head comprising a mounting shaft portion and a wrench head, the mounting shaft portion passing through the wrench head mounting hole and being axially positioned relative to the wrench head mounting hole by an axial limiting mechanism, the maximum outer diameter of the mounting shaft portion being smaller than the inner diameter of the wrench head mounting hole, the outer circumferential surface of the mounting shaft portion being formed with at least one roller limiting surface, each roller limiting surface forming a roller receiving cavity between itself and the wall of the wrench head mounting hole, the roller receiving cavity accommodating an axially reversing wrench head. Rollers with the same axial direction; the distance between the roller limiting surface and the wall of the wrench mounting hole in the vertical direction of the roller limiting surface decreases from greater than the roller diameter to less than the roller diameter from the middle to both sides along the circumference of the wrench mounting hole. When the distance is less than the roller diameter, a force-bearing working position is formed where the roller prevents the roller limiting surface from rotating relative to the inner wall of the wrench mounting hole. Each roller limiting surface corresponds to two force-bearing working positions, and the two force-bearing working positions correspond to opposite wrench rotation directions. When the distance is greater than the roller diameter, a space is formed where the roller limiting surface can rotate relative to the inner wall of the wrench mounting hole; characterized in that: The reversing mechanism includes a roller driver and a driver limiting mechanism. The roller driver includes a dial portion formed by powder metallurgy and a push claw portion. The push claw portion is integrally formed on the outer side of the bottom surface of the dial portion along the circumferential direction. The dial portion is fitted onto the top of the wrench head through a central through hole. The push claw portion extends into the roller receiving cavity and is located on the side of the roller. The thickness of the push claw portion is less than the difference between the inner diameter of the wrench head mounting hole and the maximum outer diameter of the mounting shaft portion, which allows the push claw portion to move between the mounting shaft portion and the wall of the wrench head mounting hole. An elastic element is provided on the side of the push claw portion facing the roller, and the elastic element abuts against the roller.

2. A reversing wrench according to claim 1, characterized in that: The elastic element includes an integral mounting part and an elastic part. An elastic part is provided on each side of the mounting part. The mounting part is formed into a snap-fit ​​groove that corresponds to and cooperates with the push claw part. The push claw part is snapped into the snap-fit ​​groove to form a tight fit. The elastic parts are respectively located on both sides of the push claw part.

3. A reversing wrench according to claim 2, characterized in that: The outer side of the push claw is provided with a groove, and the mounting part is inserted into the groove, so that the outer side of the mounting part does not protrude from the outer side of the push claw.

4. A reversing wrench according to claim 2, characterized in that: The elastic element is formed by stamping and bending sheet metal. The elastic part includes two elastic plates that extend at both ends and are connected to the mounting part in the middle. The two elastic plates are connected to form a V-shape, and the opening of the V-shape faces the roller.

5. A reversing wrench according to claim 1, characterized in that: The axial limiting mechanism includes a limiting sleeve with a central through hole and a first retaining ring groove on its outer circumferential surface. A second retaining ring groove corresponding to the first retaining ring groove is provided at the lower end of the wall of the wrench mounting hole. A first retaining ring is engaged in both the first and second retaining ring grooves to limit the axial position of the limiting sleeve relative to the wrench mounting hole. The mounting shaft of the wrench is a stepped shaft with a diameter greater than that at both ends in the middle section, forming an upper axial shoulder, a lower axial shoulder, an upper journal located above the upper axial shoulder, and a lower journal located below the lower axial shoulder. The roller limiting surface is located between the upper and lower axial shoulders. The lower journal passes through the central through hole of the limiting sleeve and has a third retaining ring groove. A second retaining ring is engaged in the third retaining ring groove. The wrench is axially limited by the lower axial shoulder and the second retaining ring.

6. A reversing wrench according to claim 1, characterized in that: The driver limiting mechanism includes a fourth retaining ring groove, a third retaining ring, a ball, a first spring, a spring receiving groove disposed on the upper axial shoulder end face of the lever head, and a limiting groove disposed on the bottom surface of the dial portion. The fourth retaining ring groove is disposed on the upper journal of the lever head, and the third retaining ring is engaged in the fourth retaining ring groove and pressed against the top surface of the dial portion to limit the axial position of the driver. The first spring is housed in the spring receiving groove, and the ball is disposed on the top of the first spring. Each spring receiving groove corresponds to two limiting grooves. The two limiting grooves are disposed on both sides of the line connecting the center of the push claw portion and the bottom surface of the dial portion. The two limiting grooves correspond to two force-bearing working positions with opposite directions. When the roller is in the force-bearing working position, the ball is engaged in the limiting groove under the support of the first spring.

7. A reversing wrench according to claim 1, characterized in that: The top surface of the dial section has two dial protrusions.

8. A reversing wrench according to claim 1, characterized in that: The reversing wrench also includes a workpiece anti-disengagement mechanism, which includes a guide post, a steel ball, and a second spring. The wrench head has an axial central hole, which is a stepped hole, including a large-diameter spring receiving cavity and a small-diameter guide hole. The wrench head has a radial steel ball through hole that communicates with the guide section of the central hole. The diameter of the steel ball through hole is smaller than the diameter of the steel ball. The guide post is a stepped shaft, including a large-diameter head section and a small-diameter guide shaft section. The guide shaft section has a stepped groove. The guide post is inserted into the central hole of the wrench head. The steel ball is received in the stepped groove and protrudes to the outer peripheral surface of the wrench head through the steel ball through hole. The second spring is fitted onto the guide shaft section and received in the spring receiving cavity of the central hole, and is limited by the axial end face of the central hole and the shoulders of the guide post.

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