CN219666431U - Spanner wrench - Google Patents

Abstract

The utility model relates to a wrench, which comprises a wrench body, a tooth part, a driving piece and a pawl assembly, wherein the tooth part is arranged at one end of the wrench body; the driving piece is rotatably arranged on the wrench body and is coaxially arranged with the tooth part, and the driving piece is used for driving the external element; the pawl assembly comprises at least two pawls which are arranged along the circumferential direction of the driving piece, the pawls are movably arranged on the driving piece and can be meshed with the tooth parts so as to transmit unidirectional movement between the driving piece and the wrench body, and the meshing states of the at least two pawls and the tooth parts are different; the engaged state includes a state in which the pawl is fully engaged with the tooth portion and a state in which the pawl is partially engaged with the tooth portion. The wrench can ensure the strength of products under a certain outer diameter size, reduce the rotation resistance, reduce shaking and realize the use in a narrow operation space.

Description

Spanner wrench

Technical Field

The utility model relates to the technical field of operation tools, in particular to a wrench.

Background

The wrench is a tool for tightening or loosening elements such as a socket, a nut, a bolt, etc. The existing ratchet wrench is characterized in that after a main shaft is matched with elements such as a sleeve, a nut and a bolt, the main shaft is subjected to rotary force application operation through a handle, and at the moment, the main shaft and the handle can synchronously rotate to achieve the purpose of tightening or loosening the elements such as the sleeve, the nut and the bolt. When the operation space is small, the handle is required to be reversely rotated by a certain angle, at this time, the main shaft is fixed relative to the sleeve, the nut, the bolt and other elements, and when the handle reversely rotates to the initial position, the handle is rotated again to apply force to tighten or loosen the sleeve, the nut, the bolt and other elements.

When the handle is rotated in the opposite direction, it is at least necessary to rotate the ratchet by one tooth slot angle. However, when the operation space is narrow and one tooth slot cannot be rotated, the ratchet wrench cannot be used, resulting in limited application range of the ratchet wrench.

In the related prior art, in order to reduce the angle of the reset rotation of the handle, some modes of increasing the number of gear teeth are adopted, but under the condition of ensuring the tooth shape size and the product strength, the number of the gear teeth is increased to increase the outline dimension of the ratchet wheel, if the number of the gear teeth is increased on the premise of ensuring the outline dimension of the ratchet wheel to be unchanged, the gear teeth are smaller, the meshing reliability of the pawl and the gear teeth is reduced, and the force transmission capacity is reduced.

In addition, the assembly process of each part in the existing ratchet wrench is complicated, the stability of the pawl in the motion process is poor, and the pawl is easy to deviate, so that the pawl cannot be normally meshed with the ratchet, and the stability and reliability of the meshing of the pawl and the gear teeth are further affected.

Disclosure of Invention

In view of the above, it is necessary to provide a wrench which can ensure the strength of a product at a certain outer diameter, reduce the rotational resistance, reduce the rattle, and realize use in a narrow operation space. Meanwhile, the wrench is simple and convenient in assembly process, and can achieve the integration effect. The wrench can also improve the stability and reliability of the pawl in the moving process, and ensure that the pawl can be accurately meshed with the tooth part again after being separated from the tooth part each time.

The utility model provides a wrench, comprising: a wrench body; the tooth part is arranged at one end of the wrench body; the driving piece is rotatably arranged on the wrench body and is coaxially arranged with the tooth part, and the driving piece is used for driving an external element; and a pawl assembly including at least two pawls arranged in a circumferential direction of the driving member, the pawls being movably provided to the driving member and capable of engaging with the teeth to transmit unidirectional movement between the driving member and the wrench body, at least two of the pawls being different in engagement state with the teeth; wherein the engaged state includes a state in which the pawl is fully engaged with the tooth portion and a state in which the pawl is partially engaged with the tooth portion.

In the wrench, the driving piece is matched with the external element, the wrench body is controlled to rotate by taking the axle center of the driving piece as the rotation center, and when the pawl transmits unidirectional movement between the driving piece and the wrench body, the driving piece can synchronously rotate with the wrench body to rotate to tighten or loosen the external element; when the pawl and the tooth slide, the wrench body can rotate alone, and the driving piece and the external element are fixed. When the pawl transmits unidirectional movement between the driving piece and the wrench body, at least one pawl is in a complete meshing state, and at least one pawl is in a partial meshing state with the tooth part, so that the wrench body can rotate again along the meshing direction of the pawl and the tooth part only by rotating an angle smaller than one tooth groove of the tooth part in the slipping direction of the pawl and the tooth part, thereby realizing the effect of multiple teeth, and further realizing the use of the wrench in a narrow operation space. And the pawl is arranged along the circumference of the driving piece, and the width of the pawl can be equal to or slightly larger than the width of the tooth part, so that the contact area between the pawl and the tooth part is increased, the transmission strength between the pawl and the tooth part is ensured, tooth breakage caused by insufficient torsion between the pawl and the tooth part is avoided, and the strength of the wrench is ensured.

In one embodiment, the wrench body has a movable groove, the tooth portion is disposed on an inner peripheral wall of the movable groove, the driving member is rotatably disposed in the movable groove, and the plurality of pawls are disposed along an outer peripheral wall of the driving member.

So set up, the movable groove is used for holding tooth and driving piece, can also restrict the movable range of driving piece simultaneously.

In one embodiment, the driving member includes a first end surface provided with a plurality of receiving grooves corresponding to the number of pawls, and the receiving grooves have openings toward the teeth, each of the pawls being slidably disposed in one of the receiving grooves.

The holding groove is used for holding and supporting the pawl, and can limit the sliding direction of the pawl, so that the pawl can be accurately meshed with the tooth part again after being separated from the tooth part each time.

In one embodiment, the wrench further comprises a cover body, and the cover body covers the first end face of the driving piece.

So set up, the lid can prevent that the pawl from deviating from the holding groove along the axial of driver.

In one embodiment, one of the first end surface and the cover body is provided with a plurality of clamping blocks in a protruding mode, and the other one of the first end surface and the cover body is provided with a plurality of clamping grooves capable of being clamped with the clamping blocks.

So set up, a plurality of fixture blocks and a plurality of draw-in groove joint cooperation are in order to guarantee the stability and the reliability of being connected between lid and the driving piece, are convenient for fix a position the lid simultaneously.

In one embodiment, the inner wall of the accommodating groove is provided with a limiting part, and a side surface of the cover body, which faces the driving part, is provided with a plurality of limiting parts which can be in clamping fit with the limiting part.

So set up, a plurality of locating parts and a plurality of spacing portion joint cooperation are in order to guarantee stability and the reliability of being connected between lid and the driving piece, are convenient for fix a position the lid simultaneously, are convenient for assemble.

In one embodiment, the limiting piece and the inner wall of the accommodating groove are surrounded to form a limiting groove, and each pawl is slidably arranged in one of the limiting grooves.

The setting like this, locating part and spacing portion cooperation can restrict the slip direction of pawl in the holding tank when fixed lid, guarantees that pawl and tooth portion after disengaging at every turn can both accurately mesh with the tooth portion again.

In one embodiment, the cover body is provided with a first guide groove, and the pawl is convexly provided with a first guide piece which can be in sliding fit with the first guide groove; and/or the inner wall of the accommodating groove is provided with a second guide groove, and the pawl is convexly provided with a second guide piece which can be in sliding fit with the second guide groove.

So set up, first guide and first guide way sliding fit, second guide and second guide way sliding fit all can play the effect of slip spacing and direction to the pawl, guarantee that the pawl slides along the extending direction of spacing groove all the time.

In one embodiment, the wrench further comprises a plurality of elastic members corresponding to the number of the pawls, the elastic members are disposed between the pawls and the driving member, and the elastic members can apply elastic force to the pawls so that the pawls have a tendency to move toward a side close to the teeth.

So set up, the elastic component can exert the pretension towards the tooth to the pawl to make the pawl have the trend to be close to tooth one side motion, auxiliary pawl and tooth meshing.

In one embodiment, the pawl assembly includes six pawls, the six pawls being uniformly spaced along the circumference of the driver, each two of the pawls being in the same engagement with the teeth.

By the arrangement, the stability and the reliability of meshing between the pawl and the tooth part can be guaranteed, and transmission failure caused by unexpected slipping between one pawl and the tooth part is avoided.

In one embodiment, the wrench body further includes a solid wrench portion at an end of the wrench body remote from the teeth.

So set up, when turning tightly or turn loose the great force that needs to exert of external component, and operating space is great, can use this slow-witted spanner portion, the operation is more convenient.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present utility model, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following descriptions are only some embodiments of the present utility model, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

FIG. 1 is a schematic diagram of a wrench according to an embodiment of the present utility model;

FIG. 2 is a schematic view of the structure of FIG. 1 in partial cross section provided by the present utility model;

FIG. 3 is an enlarged schematic view of the structure shown in FIG. 2A according to the present utility model;

FIG. 4 is an enlarged schematic view of the structure shown in FIG. 2B according to the present utility model;

FIG. 5 is an enlarged schematic view of the structure of FIG. 2C according to the present utility model;

FIG. 6 is a schematic perspective view of the driving member of FIG. 2 according to the present utility model;

fig. 7 is a schematic perspective view of the cover in fig. 2 according to the present utility model;

FIG. 8 is a schematic perspective view of a pawl according to the present utility model;

FIG. 9 is a schematic view of a wrench according to another embodiment of the present utility model;

FIG. 10 is a schematic perspective view of the driving member of FIG. 9 according to the present utility model;

fig. 11 is a schematic perspective view of the cover in fig. 9 according to the present utility model.

Reference numerals: 1. a wrench body; 11. a movable groove; 12. a dead wrench part; 121. a second through hole; 13. a handle; 14. a cover plate; 2. a tooth portion; 3. a driving member; 31. a receiving groove; 311. a second guide groove; 312. a limit part; 32. a first end face; 33. a first through hole; 34. a clamping block; 4. a pawl assembly; 41. a pawl; 411. a first guide; 412. a second guide; 413. a limiting block; 41a, a first pawl; 41b, a second pawl; 41c, a third pawl; 41d, fourth pawls; 41e, fifth pawls; 41f, a sixth pawl; 5. a cover body; 51. a limit groove; 52. a first guide groove; 53. a limiting piece; 54. a clamping groove; 6. an elastic member.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and the like are used in the description of the present utility model for the purpose of illustration only and do not represent the only embodiment.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" on a second feature may be that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through intermedial media. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature is less level than the second feature.

Unless defined otherwise, all technical and scientific terms used in the specification of the present utility model have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in the description of the present utility model includes any and all combinations of one or more of the associated listed items.

The existing ratchet wrench is characterized in that after a main shaft is matched with elements such as a sleeve, a nut and a bolt, the main shaft is subjected to rotary force application operation through a handle, and at the moment, the main shaft and the handle can synchronously rotate to achieve the purpose of tightening or loosening the elements such as the sleeve, the nut and the bolt. When the operation space is small, the handle is required to be reversely rotated by a certain angle, at this time, the main shaft is fixed relative to the sleeve, the nut, the bolt and other elements, and when the handle reversely rotates to the initial position, the handle is rotated again to apply force to tighten or loosen the sleeve, the nut, the bolt and other elements. When the handle is rotated in the opposite direction, it is at least necessary to rotate the ratchet by one tooth slot angle. However, when the operation space is narrow and one tooth slot cannot be rotated, the ratchet wrench cannot be used, resulting in limited application range of the ratchet wrench.

When the handle is reset, the ratchet and pawl transmission mechanism idles, and when one tooth is rotated, the pawl slides on the ratchet wheel to generate one click sound. Therefore, in the process of stressing and resetting through the handle, a neutral gear of one tooth always exists, namely, when the handle is stressed to reach the limit position, the handle can continuously stress rotation only when the reset rotation of the handle is not smaller than the corresponding central angle of one tooth, and 60 gear teeth are uniformly distributed on the circumference of the ratchet wheel for example, the corresponding central angle of one gear tooth is 6 degrees, namely, when the handle is stressed to reach the limit position, the handle can continuously stress rotation only when the handle is reset to rotate for 6 degrees; taking 72 gear teeth uniformly distributed on the circumference of the ratchet wheel as an example, the corresponding central angle of one gear tooth is 5 degrees, namely when the handle is stressed to reach the limit position, the handle can continuously stressed to rotate only when reset to rotate for 5 degrees.

In the related prior art, in order to reduce the angle of the reset rotation of the handle, some modes of increasing the number of gear teeth are adopted, but under the condition of ensuring the tooth shape size and the product strength, the number of the gear teeth is increased to increase the outline dimension of the ratchet wheel, if the number of the gear teeth is increased on the premise of ensuring the outline dimension of the ratchet wheel to be unchanged, the gear teeth are smaller, the meshing reliability of the pawl and the gear teeth is reduced, and the force transmission capacity is reduced. Some ratchet wrenches are provided with two pawls arranged in parallel along the axial direction of the ratchet wheel, and the two pawls have a transverse angle offset, so that although multiple teeth can be realized, the widths of the two pawls are only half of the width of the ratchet wheel, which can lead to smaller contact area between each pawl and the ratchet wheel, thereby reducing the transmission strength between the pawl and the ratchet wheel, still leading to poorer strength of the wrench and easy damage. In addition, the assembly process of each part in the existing ratchet wrench is complicated, the stability of the pawl in the motion process is poor, and the pawl is easy to deviate, so that the pawl cannot be normally meshed with the ratchet, and the stability and reliability of the meshing of the pawl and the gear teeth are further affected.

In order to solve the above problems, as shown in fig. 1 to 11, the present utility model provides a wrench capable of securing the strength of a product at a certain outer diameter size, reducing the turning resistance, reducing the rattling, and realizing the use in a narrow operation space. Meanwhile, the wrench is simple and convenient in assembly process, and can achieve the integration effect. The wrench can also improve the stability and reliability of the pawl in the moving process, and ensure that the pawl can be accurately meshed with the tooth part again after being separated from the tooth part each time.

As shown in fig. 1 to 2, in particular, the wrench includes a wrench body 1, a tooth portion 2, a driving member 3, and a pawl assembly 4, wherein the tooth portion 2 is disposed at one end of the wrench body 1; the driving piece 3 is rotatably arranged on the wrench body 1 and is coaxial with the tooth part 2, and the driving piece 3 is used for driving an external element; the pawl assembly 4 comprises at least two pawls 41 arranged along the circumferential direction of the driver 3, the pawls 41 being movably arranged to the driver 3 and being capable of engaging with the teeth 2 to transmit unidirectional movement between the driver 3 and the wrench body 1, the engagement of the at least two pawls 41 with the teeth 2 being different; the engaged state includes a state in which the pawl 41 is fully engaged with the tooth 2, and a state in which the pawl 41 is partially engaged with the tooth 2.

Wherein the teeth 2 may be provided in a ring-shaped configuration. The unidirectional movement of the pawl 41 transmitted between the driver 3 and the wrench body 1 may be in the-X direction as shown in fig. 2 or in the +x direction. For convenience of description, in this embodiment, it is used that the pawl 41 transmits unidirectional movement in the-X direction between the driver 3 and the wrench body 1, that is, the driver 3, the tooth 2 and the pawl 41 do not undergo relative movement.

As shown in fig. 1, the wrench body 1 further includes a handle 13, and the driving member 3 is rotatably disposed at one end of the handle 13. The driving member 3 can be engaged with a sleeve, a nut, a bolt, or the like. When the handle 13 rotates in the-X direction shown in fig. 2 with the axis of the driver 3 as the rotation center, the pawl 41 can transmit unidirectional motion in the-X direction between the driver 3 and the wrench body 1 when the pawl 41 is engaged with the tooth 2, so that the driver 3 can rotate in synchronization with the wrench body 1 in the-X direction, and at this time, the driver 3 can rotate or loosen elements such as a sleeve, a nut, and a bolt. When the handle 13 rotates around the axis of the driver 3 in the +x direction shown in fig. 2, the tooth 2 and the pawl 41 slip, and at this time, the wrench body 1 alone rotates in the +x direction shown in fig. 2 to reset, and the driver 3 and the elements such as the sleeve, the nut, and the bolt are fixed, that is, the tooth 2 and the driver 3 move relatively.

As described above, in the conventional ratchet wrench, when the handle is reversely rotated, it is at least necessary to rotate one tooth slot of the ratchet, but when the operation space is narrow and one tooth slot cannot be rotated, the ratchet wrench cannot be used, resulting in limited application range of the ratchet wrench. In the wrench provided by the utility model, the meshing states of at least two pawls 41 and the tooth part 2 are different, for example, the pawl assembly 4 comprises two pawls 41, a first pawl 41a and a second pawl 41b, when the first pawl 41a and the tooth part 2 are in a complete meshing state, the second pawl 41b and the tooth part 2 are in a partial meshing state, and when the second pawl 41b and the tooth part 2 are in a complete meshing state, the first pawl 41a and the tooth part 2 are in a partial meshing state, so that when the wrench body 1 rotates in the +X direction shown in fig. 2, the wrench body can rotate again in the-X direction shown in the figure only by rotating an angle smaller than one tooth groove of the tooth part, so as to tighten or loosen elements such as a sleeve, a nut and a bolt, thereby realizing the effect of multiple teeth, and further realizing the use of the wrench in a narrow operation space.

Compared with the prior art that the whole size of the tooth part 2 is not required to be increased or the size of the tooth shape is reduced by increasing the size of the ratchet wheel and reducing the tooth shape to increase the number of teeth, or two pawls with transverse angle offset are arranged in parallel along the axial direction of the ratchet wheel, and the pawl 41 is arranged along the circumferential direction of the driving piece 3, the width of the pawl 41 can be equal to or slightly larger than the width of the tooth part 2, namely the axial dimension along the tooth part 2, so that the contact area between the pawl 41 and the tooth part 2 is increased, the transmission strength between the pawl 41 and the tooth part 2 is ensured under the condition that the certain outer diameter dimension of the wrench is ensured, and tooth breakage caused by insufficient torsion between the pawl 41 and the tooth part 2 is avoided, thereby ensuring the strength of the wrench.

The state in which the pawl 41 is fully engaged with the tooth 2 means a state in which the tooth tip of the pawl 41 is opposed to the groove bottom of the tooth groove of the tooth 2, and the state in which the pawl 41 is partially engaged with the tooth 2 means a state in which the tooth tip of the pawl 41 is offset from the groove bottom of the tooth groove of the tooth 2, that is, a state in which the tooth tip of the pawl 41 is opposed to the side wall of the tooth groove of the tooth 2, or a state in which the tooth tip of the pawl 41 is opposed to the tooth tip of the tooth 2.

As shown in fig. 2, in the illustrated embodiment, the driving member 3 is provided as a driving ring, the center of which is provided with a first through hole 33 so that the driving ring can be sleeved outside an external element such as a nut. The first through hole 33 may have a hexagonal structure, or may have another structure that can be matched with an external element such as a nut. The bottom wall of the receiving groove 31 is provided with an opening corresponding to the drive ring to ensure that an external structure such as a screw cap can pass through the opening or that the driving member 3 can protrude out of the receiving groove 31 through the opening. In other embodiments, the driving member 3 may be provided as a driving shaft, which may be a solid shaft or a non-solid shaft, and the driving shaft may be inserted into an external element such as a screw, and the non-solid shaft may be provided with another element.

As shown in fig. 2, in the illustrated embodiment, the pawl assembly 4 includes six pawls 41, a first pawl 41a, a second pawl 41b, a third pawl 41c, a fourth pawl 41d, a fifth pawl 41e, and a sixth pawl 41f; the six pawls 41 are uniformly spaced in the circumferential direction of the driver 3, and each two pawls 41 are in the same engaged state with the tooth 2, i.e., the first pawl 41a is in the same engaged state with the fourth pawl 41d, the second pawl 41b is in the same engaged state with the fifth pawl 41e, and the third pawl 41c is in the same engaged state with the sixth pawl 41 f. In this way, the stability and reliability of the engagement between the pawls 41 and the teeth 2 can be ensured, and transmission failure caused by unexpected slipping between one of the pawls 41 and the teeth 2 can be avoided. In the state shown in fig. 3 to 5, the first pawl 41a and the fourth pawl 41d are in a partially engaged state with the tooth 2, for example, a 1/3 engaged state; the second pawl 41b and the fifth pawl 41e are in a partially engaged state with the tooth portion 2, for example, a 2/3 engaged state; the third pawl 41c and the sixth pawl 41f are in a fully engaged state with the tooth portion 2, and at this time, the tooth tops of the third pawl 41c and the sixth pawl 41f face the groove bottoms of the tooth grooves of the tooth portion 2. When the wrench body 1 rotates in the +x direction shown in fig. 2, the three states of the third and sixth pawls 41c and 41f being in full engagement with the tooth 2, the second and fifth pawls 41b and 41e being in full engagement with the tooth 2, and the first and fourth pawls 41a and 41d being in full engagement with the tooth 2 are sequentially switched.

In other embodiments, the six pawls 41 may be in different engagement with the teeth 2. Alternatively, the pawl assembly 4 may include 3, 4, 5 or more pawls 41, without limitation.

As shown in fig. 2, the wrench body 1 has a movable groove 11, the tooth portion 2 is provided at an inner peripheral wall of the movable groove 11, the driving member 3 is rotatably provided in the movable groove 11, and a plurality of pawls 41 are arranged along an outer peripheral wall of the driving member 3. The tooth 2 is provided as internal teeth, and the pawl 41 is provided as external teeth capable of meshing with the internal teeth of the tooth 2. The movable groove 11 is used for accommodating the tooth part 2 and the driving member 3, and can limit the movable range of the driving member 3. In addition, the tooth 2 and the driving element 3 are accommodated in the movable groove 11, so that the tooth 2 and the driving element 3 can be prevented from protruding from the wrench body 1 to increase the wrench volume. The tooth part 2 may be integrally formed with the inner wall of the movable groove 11, or the tooth part 2 and the inner wall of the movable groove 11 may be in a split structure and connected in a fixed form or a matched form by screws, adhesion, or the like.

As shown in fig. 2 and 6, the driving member 3 includes a first end surface 32, the first end surface 32 is provided with a plurality of receiving grooves 31 corresponding to the number of pawls 41, and the receiving grooves 31 have openings toward the tooth portion 2, and each pawl 41 is slidably disposed in one of the receiving grooves 31 to ensure that the pawl 41 can extend out of the opening of the receiving groove 31 and engage with the tooth portion 2. The receiving groove 31 serves to receive and support the pawl 41. In the illustrated embodiment, the first end face 32 of the driver 3 is provided with six accommodation grooves 31 at uniform intervals in the circumferential direction of the driver 3. Of course, in other embodiments, 3, 4, 5 or more receiving grooves 31 may be provided according to the number of pawls 41, without being particularly limited thereto.

As shown in fig. 7 and 11, the wrench further includes a cover 5, and the cover 5 is covered on the first end face 32 of the driving member 3. The cover 5 can prevent the pawls 41 from coming out of the accommodating grooves 31 in the axial direction of the driver 3. Wherein the cover 5 may be provided in a ring-shaped structure.

As shown in fig. 6 to 7, in one embodiment, the inner wall of the accommodating groove 31 is provided with a limiting portion 312, and a side surface of the cover 5 facing the driving member 3 is provided with a plurality of limiting members 53 capable of being engaged with the limiting portion 312. The plurality of limiting pieces 53 are matched with the plurality of limiting parts 312 in a clamping manner to ensure the stability and the reliability of connection between the cover body 5 and the driving piece 3, and meanwhile, the cover body 5 is conveniently positioned, so that the cover body 5 is conveniently installed. Wherein, the cover body 5 and the plurality of limiting pieces 53 can be integrally formed and arranged, so that the assembly steps are reduced; of course, the connection may be made by a fixed form or a mating form such as screws, adhesive, or the like.

As shown in fig. 2, 6 and 7, the limiting member 53 and the inner wall of the accommodating groove 31 enclose a limiting groove 51, and each pawl 41 is slidably disposed in one of the limiting grooves 51. The cooperation of the limiting piece 53 and the limiting part 312 can limit the sliding direction of the pawl 41 in the accommodating groove 31 while fixing the cover body 5, so that the pawl 41 is ensured not to shake or deviate when sliding in the accommodating groove 31, and the pawl 41 can be accurately meshed with the tooth part 2 again after being separated from the tooth part 2 each time. In addition, the cover 5 can be fixed and the pawl 41 can be limited only by covering the cover 5 on the first end face 32 of the driving member 3, thereby facilitating the production and assembly of the wrench and realizing the integration effect.

Specifically, the limiting piece 53 is set to the lug, the limiting part 312 is set to the recess that can cooperate with the lug, when installing the limiting piece 53 to the driving piece 3, the lug cooperates with the recess to can restrict the relative position between limiting piece 53 and the driving piece 3, avoid limiting piece 53 to take place the skew and influence the position of pawl 41 in holding tank 31, simultaneously, the recess cooperates with the lug and can also play the effect of counterpoint, the user of being convenient for installs lid 5 and driving piece 3. In other embodiments, the limiting member 53 may be configured as a groove, and the limiting portion 312 may be configured as a protrusion capable of being engaged with the groove; alternatively, the stopper 53 and the stopper 312 may be provided as two snap-fit engagement members or other positioning structures, and are not particularly limited.

As shown in fig. 10 to 11, in another embodiment, a plurality of clips 34 may be provided protruding from the first end surface 32 of the driver 3, and a plurality of locking grooves 54 capable of locking with the plurality of clips 34 may be provided in the cover 5. Alternatively, a plurality of clips 34 may be provided on a side surface of the cover 5 facing the driver 3, and a plurality of clip grooves 54 capable of being clipped to the plurality of clips 34 may be provided on the first end surface 32 of the driver 3. The number of the clamping blocks 34 and the clamping grooves 54 can be 1, 2, 3 or more, the clamping blocks 34 are arranged at intervals along the circumferential direction of the driving piece 3 and are staggered with the containing grooves 31, so that the connection stability of the cover body 5 and the driving piece 3 is ensured, and the clamping blocks 34 are prevented from interfering with the pawls 41 in the containing grooves 31.

As shown in fig. 9 to 10, the width of the accommodating groove 31 is the same as the width of the pawl 41, that is, the accommodating groove 31 itself serves as the limiting groove 51 to ensure that the pawl 41 does not shake or shift when sliding in the accommodating groove 31, so that the sliding direction of the pawl 41 can be limited even without providing the limiting piece 53, and that the pawl 41 can be accurately engaged with the tooth 2 again after each disengagement of the pawl from the tooth 2. The accommodating groove 31 may be formed by enclosing the driving element 3 with the inner wall of the movable groove 11, or may be formed by independently forming the driving element 3. When the accommodating groove 31 itself is used as the limiting groove 51, the accommodating groove 31 needs to be opened in a smaller volume, and the portion to be removed on the driving element 3 is smaller in volume, so that the strength of the driving element 3 can be improved.

Of course, in other embodiments, the cover 5 and the driving member 3 may be fixedly connected by other means such as screws or adhesion, so long as the stability and reliability of the connection between the two can be ensured, and the present utility model is not limited thereto. Alternatively, the driving member 3 and the cover 5 may be integrally formed, and the limiting groove 51 may be formed during the manufacturing process.

As shown in fig. 7 to 9 and 11, the cover 5 is provided with a first guide groove 52, and the pawl 41 is provided with a first guide 411 protruding so as to be slidably engaged with the first guide groove 52. The inner wall of the accommodating groove 31 is provided with a second guide groove 311, and the pawl 41 is provided with a second guide 412 protruding to be slidably fitted with the second guide groove 311. The extending directions of the limiting groove 51, the first guiding groove 52 and the second guiding groove 311 are the same. The first guide piece 411 is in sliding fit with the first guide groove 52, and the second guide piece 412 is in sliding fit with the second guide groove 311, so that the pawl 41 can be subjected to sliding limiting and guiding, and the pawl 41 is ensured to always slide along the extending direction of the limiting groove 51; at the same time, the stability of the pawl 41 in the sliding process can be improved, and the shake can be reduced. In this case, only one of the inner walls of the cover 5 and the accommodating groove 31 may be provided with a guide groove, and a guide may be provided on the side of the pawl 41 corresponding to the guide groove, as long as the sliding direction of the pawl 41 can be restricted.

As shown in fig. 2 and 9, the wrench further includes a plurality of elastic members 6 corresponding to the number of the pawls 41, the elastic members 6 are disposed between the pawls 41 and the driving member 3, and the elastic members 6 can apply an elastic force to the pawls 41 so that the pawls 41 have a tendency to move toward the tooth 2. The elastic member 6 can apply a pre-tightening force to the pawl 41 toward the tooth 2 so that the pawl 41 has a tendency to move toward the side closer to the tooth 2, assisting the pawl 41 in engagement with the tooth 2. The two ends of the elastic member 6 are respectively abutted against the pawl 41 and the limiting member 53 or the inner walls of the pawl 41 and the accommodating groove 31, and when the pawl 41 is separated from the tooth 2, the elastic member 6 moves in the accommodating groove 31 towards the side far away from the tooth 2, so that the elastic member is further compressed. The elastic member 6 may be a member having elasticity such as a spring, a rubber member, a silicone member, or the like.

As shown in fig. 8, the end of the pawl 41 capable of protruding out of the opening of the accommodating groove 31 is provided with at least one ratchet to engage with the tooth 2. The one end that pawl 41 deviates from tooth 2 is equipped with the stopper 413 that is used for carrying out spacing to the spring, and the one end of spring can overlap and locate on stopper 413, and the other end limit is located the inner wall of locating part 53 or holding tank 31, avoids the spring to disengage and leads to unable exerting towards tooth 2's force to pawl 41 with pawl 41, locating part 53 or holding tank 31's inner wall in the deformation process.

As shown in fig. 1, the wrench body 1 further comprises a solid wrench portion 12 at an end of the wrench body 1 remote from the tooth portion 2. The center of the dead wrench part 12 is provided with a second through hole 121, so that the dead wrench part 12 can be sleeved outside external elements such as nuts. The second through hole 121 may have a hexagonal structure, or may have other structures that can be matched with external components such as nuts, and the side wall of the second through hole 121 is provided with an opening so as to facilitate the external components such as nuts to be clamped into the second through hole 121. Because the strength of the solid wrench part 12 relative to the end of the wrench body 1 close to the tooth part 2 is larger, when the force required to be applied for turning the external element tightly or loosely is larger, and the operation space is larger, the solid wrench part 12 can be used, and the operation is more convenient, so that the application range of the wrench is wider.

As shown in fig. 1, the wrench body 1 further includes a cover plate 14, where the cover plate 14 covers one end of the accommodating groove 31, so as to prevent the cover body 5 from being exposed, and also prevent the driving member 3 and the cover body 5 from being separated from the wrench body 1. The central opening of the cover plate 14 can ensure that an external structure such as a screw cap can pass through the opening or that the driver 3 can protrude through the receiving groove 31.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of the utility model should be determined from the following claims.

Claims (11)

1. A wrench, comprising:

a wrench body (1);

a tooth part (2) arranged at one end of the wrench body (1);

a driving member (3) rotatably disposed on the wrench body (1) and coaxially disposed with the tooth portion (2), the driving member (3) being configured to drive an external element; and

a pawl assembly (4) comprising at least two pawls (41) arranged in the circumferential direction of the driver (3), the pawls (41) being movably provided to the driver (3) and being capable of engaging with the teeth (2) to transmit unidirectional movement between the driver (3) and the wrench body (1), the engagement of at least two pawls (41) with the teeth (2) being different;

wherein the engaged state includes a state in which the pawl (41) is fully engaged with the tooth portion (2), and a state in which the pawl (41) is partially engaged with the tooth portion (2).

2. Wrench according to claim 1, wherein the wrench body (1) has a movable groove (11), the tooth portion (2) is provided to an inner peripheral wall of the movable groove (11), the driving member (3) is rotatably provided in the movable groove (11), and a plurality of pawls (41) are arranged along an outer peripheral wall of the driving member (3).

3. A wrench as claimed in claim 2, wherein the driver (3) comprises a first end face (32), the first end face (32) being provided with a number of receiving grooves (31) corresponding to the number of pawls (41), and the receiving grooves (31) having openings towards the teeth (2), each pawl (41) being slidably arranged in one of the receiving grooves (31).

4. A wrench as claimed in claim 3, characterised in that the wrench further comprises a cover (5), the cover (5) being adapted to cover the first end face (32) of the driver (3).

5. The wrench as claimed in claim 4, wherein one of the first end face (32) and the cover (5) is provided with a plurality of clamping blocks (34) in a protruding manner, and the other one is provided with a plurality of clamping grooves (54) capable of being clamped with the plurality of clamping blocks (34).

6. The wrench as claimed in claim 4, wherein the inner wall of the accommodating groove (31) is provided with a limiting portion (312), and a side surface of the cover body (5) facing the driving member (3) is provided with a plurality of limiting members (53) capable of being engaged with the limiting portion (312).

7. The wrench as claimed in claim 6, wherein the limiting member (53) and the inner wall of the receiving groove (31) define limiting grooves (51), and each pawl (41) is slidably disposed in one of the limiting grooves (51).

8. Wrench according to claim 4, wherein the cover (5) is provided with a first guiding groove (52), and the pawl (41) is provided with a first guiding piece (411) which can be in sliding fit with the first guiding groove (52) in a protruding manner; and/or

The inner wall of the accommodating groove (31) is provided with a second guide groove (311), and the pawl (41) is convexly provided with a second guide piece (412) which can be in sliding fit with the second guide groove (311).

9. The wrench as claimed in any one of claims 1-8, further comprising a number of resilient members (6) corresponding to the number of pawls (41), the resilient members (6) being disposed between the pawls (41) and the driver (3), the resilient members (6) being capable of exerting a resilient force on the pawls (41) such that the pawls (41) have a tendency to move towards the side closer to the teeth (2).

10. A wrench as claimed in any one of claims 1 to 8, wherein said pawl assembly (4) includes six said pawls (41), the six said pawls (41) being evenly spaced circumferentially about said driver (3), each two of said pawls (41) being in the same engaged condition with said teeth (2).

11. Wrench according to any one of claims 1-8, in which the wrench body (1) further comprises a solid wrench part (12) at the end of the wrench body (1) remote from the tooth (2).