Self-locking wrench

Abstract

The utility model is suitable for the technical field of wrenches, and provides a self-locking wrench. Comprising a fixed wrench arm, a movable wrench arm and a wrench head, one end of the fixed wrench arm is fixedly connected with one end of the wrench head, and the other end of the fixed wrench arm is rotationally connected with the movable wrench arm; the movable wrench arm can be switched between a first position and a second position, and when the movable wrench arm is located at the first position, the axis of the movable wrench arm and the axis of the fixed wrench arm coincide with each other; when the movable wrench arm is located at the second position, the axis of the movable wrench arm is perpendicular to the axis of the fixed wrench arm, and the axis of the movable wrench arm is perpendicular to the plane where the wrench head clamps the operation object to rotate. According to the self-locking wrench, after the movable wrench arm is rotated to the second position, the wrench head used for clamping an operation object can be rapidly and continuously rotated by hand-cranking the movable wrench arm, the wrench head does not need to be withdrawn from the operation object in the midway, the position of the self-locking wrench does not need to be adjusted again, and the working efficiency is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of wrenches, and in particular relates to a self-locking wrench. Background Art

[0002] As a commonly used installation and disassembly tool, the wrench has a large number of variants in various forms according to different usage scenarios and objects. According to the scope of application of the wrench head, it can be divided into fixed and movable types. The movable wrench head can be divided into manual adjustment and automatic adjustment. The automatic adjustment wrench head can achieve adaptive operation object size through structural design, which is more convenient and quick to use. During the operation of a conventional wrench, external force can only be applied to the wrench handle along the direction of thread rotation. In most cases, after the wrench is rotated to a certain angle, it is necessary to withdraw from the working object, readjust the wrench angle, and then apply force again to repeat the above process, which is inefficient. In some working environments, the wrench can make a complete circular motion around the working object, but this situation has high requirements for the working space, is inconvenient to apply force, and leads to low efficiency.

[0003] In large structures in the construction industry, mechanical connection of steel bar straight thread sleeves is often required. On the one hand, the straight thread sleeve has many threads, and the steel bar needs to be rotated many times during the connection process; on the other hand, the steel bar has various sizes and is heavy, which consumes the workers' physical strength. Therefore, a convenient, efficient and labor-saving wrench is particularly important. The existing common wrenches are less efficient in the mechanical connection of steel bar straight thread sleeves. Therefore, it is necessary to design a convenient and efficient screwing tool. Utility Model Content

[0004] The purpose of the embodiment of the utility model is to provide a self-locking wrench, aiming to solve the problem of low working efficiency of wrenches in the prior art.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A self-locking wrench comprises a fixed wrench arm, a movable wrench arm and a wrench head for clamping a work object;

[0007] One end of the fixed wrench arm is fixedly connected to one end of the wrench head, and the other end of the fixed wrench arm is rotatably connected to the movable wrench arm;

[0008] The movable wrench arm can be rotated and switched between a first position and a second position. When the movable wrench arm is in the first position, the axis of the movable wrench arm coincides with the axis of the fixed wrench arm; when the movable wrench arm is in the second position, the axis of the movable wrench arm is perpendicular to the axis of the fixed wrench arm, and the axis of the movable wrench arm is perpendicular to the plane in which the wrench head rotates to clamp the working object.

[0009] Furthermore, the wrench head includes a fixed pliers, a movable pliers, a torsion spring and a first rotating shaft, one end of the fixed pliers is fixedly connected to the fixed wrench arm, the movable pliers is rotatably connected to the fixed pliers via the first rotating shaft, and a jaw for clamping a work object is formed between the fixed pliers and the other end of the fixed pliers, the torsion spring is sleeved on the first rotating shaft, and the two ends of the torsion spring respectively abut the movable pliers and the fixed pliers, the movable pliers keeps the jaw closed under the elastic force of the torsion spring, and the axis of the fixed wrench arm and the axis of the first rotating shaft are parallel to each other.

[0010] Furthermore, the fixed pliers have an arc-shaped pliers tooth portion at one end away from the fixed wrench arm, and the movable pliers have a straight pliers tooth portion opposite to the arc-shaped pliers tooth portion.

[0011] Furthermore, the fixed wrench arm and the movable wrench arm are connected by a hinge assembly, and the hinge assembly includes a first connecting member, a second rotating shaft and a second connecting member, the first connecting member is connected to the end of the fixed wrench arm, the second connecting member is connected to the end of the movable wrench arm, the first connecting member and the second connecting member are rotatably connected by the second rotating shaft, and the axis of the second rotating shaft is perpendicular to the axis of the fixed wrench arm.

[0012] Further, a projection of the first connecting member along the axial direction of the fixed wrench arm is located within the end surface of the fixed wrench arm.

[0013] Furthermore, the contact surface between the first connecting member and the fixed wrench arm is rectangular, and the cross-section of the fixed wrench arm is circular.

[0014] Furthermore, the movable wrench arm includes a hollow turning handle, a wrench rod and a limit pin; one end of the wrench rod is fixedly connected to the second connecting piece, the hollow turning handle can be movably mounted on the periphery of the wrench rod along the axial direction of the wrench rod, and can be movably mounted on the periphery of the hinge assembly and stopped at the end of the fixed wrench arm, and the limit pin can be detachably passed through the other end of the wrench rod.

[0015] Further, a projection of the second connecting member along the axial direction of the wrench rod is located within the end surface of the wrench rod.

[0016] Furthermore, the contact surface between the first connecting member and the fixed wrench arm is rectangular, and the cross-sections of the wrench rod and the hollow turning handle are both circular.

[0017] Furthermore, the cross-section of the fixed wrench arm is circular, and the inner diameter of the hollow turning handle is smaller than the outer diameter of the fixed wrench arm.

[0018] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0019] The utility model discloses that the movable wrench arm can be rotatably connected to the fixed wrench arm through the movable wrench arm, and the movable wrench arm can be rotated from the first position to the second position, so that the axis of the movable wrench arm and the axis of the movable wrench arm are perpendicular to each other, so that the axis of the movable wrench arm and the plane where the wrench head clamps the working object are rotated are perpendicular to each other, so that the direction of the working force is changed, so that the movable wrench arm can be manually cranked to facilitate the force to quickly and continuously rotate the wrench head for clamping the working object, and there is no need to withdraw the wrench head from the working object and readjust the position of the self-locking wrench in the middle of the process, thereby greatly improving the working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the first state when the self-locking wrench provided by the embodiment of the utility model is in the first position;

[0021] Figure 2 It is a schematic diagram of the structure of the second state when the self-locking wrench provided by the embodiment of the utility model is in the first position;

[0022] Figure 3 It is a structural schematic diagram of the self-locking wrench provided by the embodiment of the utility model when it is in the second position;

[0023] Figure 4 The utility model is a schematic diagram of the exploded structure of the self-locking wrench provided in the embodiment of the utility model.

[0024] The reference numerals in the figures are:

[0025] 1. Wrench head; 2. Fixed wrench arm; 3. Articulated assembly; 4. Active wrench arm; 101. Active pliers; 102. Fixed pliers; 103. First rotating shaft; 104. Torsion spring; 301. First connecting member; 302. Second rotating shaft; 303. Second connecting member; 401. Hollow handle; 402. Wrench rod; 403. Limit pin. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0027] In the description of the present utility model, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model.

[0028] like Figures 1 to 4 As shown, an embodiment of the utility model provides a self-locking wrench. The self-locking wrench comprises a fixed wrench arm 2, a movable wrench arm 4 and a wrench head 1 for clamping a work object, wherein one end of the fixed wrench arm 2 is fixedly connected to one end of the wrench head 1, and the other end of the fixed wrench arm 2 is rotatably connected to the movable wrench arm 4. The movable wrench arm 4 can be rotated and switched between a first position and a second position. When the movable wrench arm 4 is in the first position, the axis of the movable wrench arm 4 coincides with the axis of the fixed wrench arm 2; when the movable wrench arm 4 is in the second position, the axis of the movable wrench arm 4 is perpendicular to the axis of the fixed wrench arm 2, and the axis of the movable wrench arm 4 is perpendicular to the plane where the wrench head 1 rotates to clamp the work object. It can be understood that the plane where the wrench head 1 rotates to clamp the work object is a plane parallel to the axis of the fixed wrench arm 2.

[0029] The self-locking wrench retains the features of a traditional straight-arm wrench, and can rotate the movable wrench arm 4 relative to the fixed wrench arm 2, so that the included angle between the axis of the movable wrench arm 4 and the axis of the fixed wrench arm 2 is 90 degrees. At this time, the force point of the self-locking wrench is transferred from the axis of the fixed wrench arm 2 to the axis of the movable wrench arm 4, thereby realizing the change of direction of the operating force, so that the operator can change the downward pressure force to the hand-cranking force.

[0030] As an embodiment, the wrench head 1 includes a fixed clamp 102, an active clamp 101, a torsion spring 104 and a first rotating shaft 103, one end of the fixed clamp 102 is fixedly connected to the fixed wrench arm 2, the active clamp 101 is rotatably connected to the fixed clamp 102 through the first rotating shaft 103, and a jaw for clamping a work object is formed between the fixed clamp 102 and the other end of the fixed clamp 102, the axis of the fixed wrench arm 2 and the axis of the first rotating shaft 103 are parallel to each other, the torsion spring 104 is sleeved on the first rotating shaft 103, and the two ends of the torsion spring 104 are respectively abutted against the active clamp 101 and the fixed clamp 102, and the active clamp 101 keeps the jaw closed under the elastic force of the torsion spring 104 to prevent the active clamp 101 from moving arbitrarily without the action of other external forces. The active clamp 101 can be rotatably connected to the fixed clamp 102, and can be applied to work objects of different sizes. It can be understood that the plane on which the movable pliers 101 rotate is the same as or parallel to the plane on which the wrench head 1 rotates to clamp the working object.

[0031] The end of the fixed clamp 102 near the jaws is designed as an arc-shaped end. When the jaws are closed, the end of the movable clamp 101 near the jaws protrudes from the end of the fixed clamp 102, and a bayonet is formed between the end of the movable clamp 101 near the jaws and the arc-shaped end of the fixed clamp 102. When in use, the bayonet is aligned with the working object (such as a fastener with internal threads), and after the end of the movable clamp 101 near the jaws is subjected to force, the jaws are opened to cover the working object, and the working object is clamped under the action of the torsion spring 104. Since the end of the fixed clamp 102 near the jaws is designed as an arc-shaped end, when the arm is subjected to force, the movable clamp 101 and the fixed clamp 102 can automatically lock the working object without manual adjustment, and the greater the force, the tighter the bite of the two to avoid slipping.

[0032] In the above embodiment, the fixed clamp 102 has an arc-shaped clamp tooth portion at one end away from the fixed wrench arm 2, and the movable clamp 101 has a straight clamp tooth portion opposite to the arc-shaped clamp tooth portion, so that the fixed clamp 102 and the movable clamp 101 enhance the friction when clamping the working object, thereby improving the stability of clamping the working object.

[0033] As an embodiment, the fixed wrench arm 2 and the movable wrench arm 4 are connected by a hinge assembly 3, and the hinge assembly 3 includes a first connecting member 301, a second rotating shaft 302 and a second connecting member 303. The first connecting member 301 is connected to the end of the fixed wrench arm 2, and the second connecting member 303 is connected to the end of the movable wrench arm 4. The first connecting member 301 and the second connecting member 303 are rotationally connected by the second rotating shaft 302. The axis of the second rotating shaft 302 is perpendicular to the axis of the fixed wrench arm 2, and the axis of the second rotating shaft 302 is also perpendicular to the axis of the movable wrench arm 4. The movable wrench arm 4 can rotate relative to the fixed wrench arm 2 through the hinge assembly. Specifically, the projection of the first connecting member 301 along the axis direction of the fixed wrench arm 2 is located within the end surface of the fixed wrench arm 2. Preferably, the contact surface between the first connecting member 301 and the fixed wrench arm 2 is rectangular, and the cross section of the fixed wrench arm 2 is circular.

[0034] As an embodiment, the movable wrench arm 4 includes a hollow turning handle 401, a wrench rod 402 and a limit pin 403; one end of the wrench rod 402 is fixedly connected to the second connecting member 303, and the hollow turning handle 401 is movably mounted on the periphery of the wrench rod 402 along the axial direction of the wrench rod 402, and can be movably mounted on the periphery of the hinge assembly 3 and stopped at the end of the fixed wrench arm 2, and the limit pin 403 detachably passes through the other end of the wrench rod 402. Specifically, a limit hole is provided at the end of the wrench rod 402, and the limit pin 403 is inserted into the limit hole, so that the limit pin 403 can resist the end of the hollow turning handle 401 away from the wrench head 1, and the limit pin 403 is installed on the wrench rod 402 to stop the movement of the hollow turning handle 401, so as to form an anti-slip constraint on the hollow turning handle 401 to prevent the hollow turning handle 401 from falling off the handle rod.

[0035] Specifically, the projection of the second connecting member 303 along the axial direction of the wrench rod 402 is located within the end surface of the wrench rod 402, the contact surface between the first connecting member 301 and the fixed wrench arm 2 is rectangular, the cross-sections of the wrench rod 402 and the hollow turning handle 401 are both circular, the cross-section of the fixed wrench arm 2 is circular, and the inner diameter of the hollow turning handle 401 is smaller than the outer diameter of the fixed wrench arm 2, so that in a conventional working scenario, after the movable wrench arm 4 is rotated until its axis coincides with the axis of the fixed wrench arm 2, the movable wrench arm 4 and the fixed wrench arm 2 maintain the same axis, so that the hollow turning handle 401 can move along the axis of the movable wrench arm 4 to abut the end of the fixed wrench arm 2, and can cover the hinge assembly 3 and constrain the rotation of the hinge assembly 3, so that the hollow turning handle 401 can limit the rotation of the movable wrench arm 4. Under the constraint of the hollow turning handle 401, the movable wrench arm 4 and the fixed wrench arm 2 are spliced ​​into a wrench straight arm, which can be subjected to force as a whole.

[0036] The utility model can be applied to working objects of different sizes through the wrench head 1, and can automatically lock the working object without manual adjustment, which is convenient and fast. At the same time, the self-locking wrench can retain the structure of the traditional wrench straight arm, and can rotate the movable wrench arm 4. The movable wrench arm 4 can be rotatably connected to the fixed wrench arm 2, and the movable wrench arm 4 can be rotated from the first position to the second position, so that the axis of the movable wrench arm 4 and the axis of the movable wrench arm 4 are perpendicular to each other, so that the axis of the movable wrench arm 4 and the plane where the wrench head 1 rotates to clamp the working object are perpendicular to each other, so as to realize the change of the working force, so that the movable wrench arm 4 can be manually cranked to facilitate the force to quickly and continuously rotate the wrench head 1 used to clamp the working object, and there is no need to withdraw the wrench head 1 from the working object and readjust the position of the self-locking wrench in the middle, which greatly improves the working efficiency. It has the advantages of convenience and high efficiency.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-locking wrench, characterized in that: It includes a fixed wrench arm, a movable wrench arm and a wrench head for clamping a work object; One end of the fixed wrench arm is fixedly connected to one end of the wrench head, and the other end of the fixed wrench arm is rotatably connected to the movable wrench arm; The movable wrench arm can be rotated and switched between a first position and a second position. When the movable wrench arm is in the first position, the axis of the movable wrench arm coincides with the axis of the fixed wrench arm; when the movable wrench arm is in the second position, the axis of the movable wrench arm is perpendicular to the axis of the fixed wrench arm, and the axis of the movable wrench arm is perpendicular to the plane in which the wrench head rotates to clamp the working object.

2. The self-locking wrench according to claim 1, characterized in that: The wrench head includes a fixed pliers, a movable pliers, a torsion spring and a first rotating shaft. One end of the fixed pliers is fixedly connected to the fixed wrench arm. The movable pliers is rotatably connected to the fixed pliers via the first rotating shaft. A jaw for clamping a work object is formed between the fixed pliers and the other end of the fixed pliers. The torsion spring is sleeved on the first rotating shaft, and the two ends of the torsion spring respectively abut against the movable pliers and the fixed pliers. The movable pliers keeps the jaw closed under the elastic force of the torsion spring. The axis of the fixed wrench arm and the axis of the first rotating shaft are parallel to each other.

3. The self-locking wrench according to claim 2, characterized in that: The fixed pliers have an arc-shaped pliers tooth portion at one end away from the fixed wrench arm, and the movable pliers have a straight pliers tooth portion opposite to the arc-shaped pliers tooth portion.

4. The self-locking wrench according to claim 1, characterized in that: The fixed wrench arm and the movable wrench arm are connected by a hinge assembly, and the hinge assembly includes a first connecting member, a second rotating shaft and a second connecting member, the first connecting member is connected to the end of the fixed wrench arm, the second connecting member is connected to the end of the movable wrench arm, the first connecting member and the second connecting member are rotatably connected by the second rotating shaft, and the axis of the second rotating shaft is perpendicular to the axis of the fixed wrench arm.

5. The self-locking wrench according to claim 4, characterized in that: The projection of the first connecting member along the axial direction of the fixed wrench arm is located within the end surface of the fixed wrench arm.

6. The self-locking wrench according to claim 5, characterized in that: The contact surface between the first connecting member and the fixed wrench arm is rectangular, and the cross section of the fixed wrench arm is circular.

7. The self-locking wrench according to claim 4, characterized in that: The movable wrench arm includes a hollow turning handle, a wrench rod and a limit pin; one end of the wrench rod is fixedly connected to the second connecting piece, the hollow turning handle can be movably mounted on the periphery of the wrench rod along the axial direction of the wrench rod, and can be movably mounted on the periphery of the hinge assembly and stopped at the end of the fixed wrench arm, and the limit pin can be detachably passed through the other end of the wrench rod.

8. The self-locking wrench according to claim 7, characterized in that: The projection of the second connecting member along the axial direction of the wrench rod is located within the end surface of the wrench rod.

9. The self-locking wrench according to claim 8, characterized in that: The contact surface between the first connecting member and the fixed wrench arm is rectangular, and the cross-sections of the wrench rod and the hollow turning handle are both circular.

10. The self-locking wrench according to claim 9, characterized in that: The cross section of the fixed wrench arm is circular, and the inner diameter of the hollow turning handle is smaller than the outer diameter of the fixed wrench arm.

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