Wrench convenient to stretch out, draw back and replace head

Abstract

The wrench comprises a hollow square tube and an inner core rod, the inner core rod is sleeved with the hollow square tube in a sliding mode, the front end of the inner core rod is exposed out of the front end of the hollow square tube, a rotating tooth head is fixed to the front end of the inner core rod through a hexagonal screw, and the rotating tooth head is connected with the hollow square tube. An outer arc tooth surface protruding outwards is arranged on the outer side of the rotating tooth head, one end of the rotating tooth head is rotationally connected with claw force teeth through a rivet, an inner arc tooth surface opposite to the outer arc tooth surface is arranged on the inner sides of the claw force teeth, the rivet is sleeved with a torsion spring, one end of the torsion spring is connected to the claw force teeth, and the other end of the torsion spring is connected to the rotating tooth head. A fixed tail plug is fixed at the rear end of the hollow square tube; a telescopic spring is connected between the fixed tail plug and the inner core rod; the telescopic wrench has the advantages of being novel in structure, convenient to stretch out and draw back, capable of adjusting the length of the wrench to adapt to application of the wrench in different depth environments, and capable of conveniently and rapidly replacing claw force teeth of different models and sizes to adapt to nuts of different sizes needing to be screwed.

Description

Technical Field

[0001] The utility model relates to a wrench, in particular to a wrench which is convenient for extension and head replacement. Background Art

[0002] Sanitary ware is an indispensable tool in people's life and work, whether in ordinary people's homes, public leisure places, state agencies or factories and schools.

[0003] The longer the use time, the shorter the service life of sanitary ware, especially the water supply and drainage system of sanitary ware, which will seep and leak, and new accessories need to be replaced every time. Since the radius of the fixed nut of the water supply and drainage accessories is much larger than that of the general nut, it brings great inconvenience to the disassembly and assembly work. At present, the sink wrench is a special tool for operation in such a narrow space. When disassembling and assembling the accessories of sanitary ware, if the working space is large enough, the wrench head can be used horizontally with the main load-bearing rod: if the working space is too small, the wrench head can be used with the main load-bearing rod at a 90-degree angle. At this time, the auxiliary load-bearing rod and the wrench head are also used at a 90-degree angle to make up for the torque lost by the main load-bearing village due to the reduction of the force arm: this facilitates the disassembly and assembly of sanitary accessories, and the structure is reasonable and the operation is simple.

[0004] However, the handles of existing sink wrenches are all of fixed length, and the existing sink wrenches are often unable to perform operations in situations where it is necessary to reach a deeper position inside the sink.

[0005] In addition, the existing similar sink wrenches have a fixed length, which is not convenient for adjusting the length of the wrench, and another defect is that the wrench head is not convenient for replacement, which affects the replacement and use of nuts (nuts) of different specifications and models. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a wrench which is convenient for extension and head replacement in view of the deficiencies of the prior art.

[0007] In order to achieve the above purpose, the measures taken by the utility model are:

[0008] A wrench convenient for extension and head replacement comprises a hollow square tube and an inner core rod, wherein the inner core rod is slidably sleeved in the hollow square tube, the front end of the inner core rod is exposed to the outside of the front end of the hollow square tube, the front end of the inner core rod is fixed with a rotating tooth head by a hexagonal screw, the outer side of the rotating tooth head is provided with an outer arc tooth surface protruding outward, one end of the rotating tooth head is rotatably connected with a claw force tooth by a rivet, the inner side of the claw force tooth is provided with an inner arc tooth surface opposite to the outer arc tooth surface, a torsion spring is sleeved on the rivet, one end of the torsion spring is connected to the claw force tooth, and the other end is connected to the rotating tooth head, a fixed tail plug is fixed to the rear end of the hollow square tube, and a telescopic spring is connected between the fixed tail plug and the inner core rod;

[0009] A push switch for controlling the telescopic length of the inner core rod is installed on the hollow square tube, and the push switch includes a switch protection cover fixed on the side wall of the hollow square tube, a switch seesaw is rotatably connected in the switch protection cover, a seesaw shaft rotatably connected to the switch protection cover is provided on the middle section of the switch seesaw, a positioning claw is provided at one end of the switch seesaw, and a seesaw pressing portion is provided at the other end, an inner core rod is provided with an inner core rod tooth surface for positioning with the positioning claw, a switch spring is provided between the switch seesaw at one end of the positioning claw and the switch protection cover, one end of the switch spring presses on the switch seesaw, and the other end presses on the switch protection cover, a switch button is provided between the switch seesaw at one end of the seesaw pressing portion and the switch protection cover, and the switch button is exposed to the outside of the switch protection cover;

[0010] An elastic pin is transversely fixed to the middle section of the inner core rod, one end of the telescopic spring is fixed to the elastic pin, and the other end is fixed to the fixed tail plug;

[0011] The telescopic spring is sleeved inside the inner core rod;

[0012] A labor-saving slide rod passes through the rear end of the hollow square tube, and the labor-saving slide rod is vertically arranged with the hollow square tube;

[0013] A protective sleeve is fixed to the front end of the hollow square tube, the inner core rod is slidably arranged in the protective sleeve, and a limiting sleeve is fixed to the rear end of the inner core rod;

[0014] A head gasket and a compression spring are provided between the front end of the inner core rod and the rotating tooth head. The head gasket is fixed on the front end of the inner core rod. One end of the compression spring presses on the head gasket and the other end presses on the rotating tooth head.

[0015] The claw force teeth have various sizes, specifications and models.

[0016] The utility model has the following beneficial effects: novel structure, convenient extension and retraction, and the length of the wrench can be adjusted to cope with the application of the wrench in different depth environments, and claw teeth of different models and sizes can be conveniently and quickly replaced to cope with nuts of different sizes that need to be tightened. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the exploded structure of the utility model.

[0018] Figure 2 The utility model is a schematic diagram of the switch seesaw structure. DETAILED DESCRIPTION

[0019] A wrench that is convenient for telescopic and head replacement includes a hollow square tube 17 and an inner core rod 8, wherein the inner core rod 8 is slidably sleeved in the hollow square tube 17, the front end of the inner core rod 8 is exposed to the outside of the front end of the hollow square tube 17, the front end of the inner core rod 8 is fixed with a rotating tooth head 2 through a hexagonal screw 3, the outer side of the rotating tooth head 2 is provided with an outer arc tooth surface 201 protruding outward, one end of the rotating tooth head 2 is rotatably connected with a claw force tooth 1 through a rivet 7, the inner side of the claw force tooth 1 is provided with an inner arc tooth surface 101 opposite to the outer arc tooth surface 201, a torsion spring 6 is sleeved on the rivet 7, one end of the torsion spring 6 is connected to the claw force tooth 1, and the other end is connected to the rotating tooth head 2, a fixed tail plug 18 is fixed to the rear end of the hollow square tube 17, and a telescopic spring 15 is connected between the fixed tail plug 18 and the inner core rod 8. A hanging hole is provided at the outer end of the fixed tail plug 18.

[0020] like Figure 1 As shown, the nut to be tightened is clamped between the inner arc tooth surface 101 of the claw force tooth and the outer arc tooth surface 201 of the rotating tooth head 2. By rotating the entire utility model through the labor-saving slide rod 19, the conventional rotation of the nut (nut) can be achieved, realizing the function of a conventional wrench. The elastic force of the torsion spring 6 drives the claw force tooth 1 to rotate toward the rotating tooth head 2 to achieve clamping.

[0021] By extending and retracting the inner core rod 8 along the hollow square tube 17, the length of the entire utility model can be adjusted to meet the needs of using the wrench in different depths and distance environments.

[0022] A push switch for controlling the telescopic length of the inner core rod 8 is installed on the hollow square tube 17. The push switch includes a switch protective cover 11 fixed on the side wall of the hollow square tube 17. A switch seesaw 13 is rotatably connected in the switch protective cover 11. A seesaw shaft 1301 rotatably connected to the switch protective cover 11 is provided on the middle section of the switch seesaw 13. A positioning claw 1302 is provided at one end of the switch seesaw 13, and a seesaw pressing portion 1303 is provided at the other end. The inner core rod 8 is provided with an inner core rod tooth surface 801 for positioning with the positioning claw 1302. A switch spring 10 is provided between the switch seesaw 13 at one end of the positioning claw 1302 and the switch protective cover 11. One end of the switch spring 10 presses on the switch seesaw 13, and the other end presses on the switch protective cover 11. A switch button 12 is provided between the switch seesaw 13 at one end of the seesaw pressing portion 1303 and the switch protective cover 11, and the switch button 12 is exposed to the outside of the switch protective cover 11.

[0023] In the absence of external force, the elastic force of the telescopic spring 15 keeps the inner core rod 8 in the hollow square tube 17. By pressing the switch button 12, one end of the seesaw pressing portion 1303 of the switch seesaw 13 is pressed, the switch seesaw 13 rotates along the seesaw axis 1301, the positioning claw 1302 separates from the inner core rod tooth surface 801, and the inner core rod 8 is pulled outward by force for a distance. After releasing the switch button 12, the elastic force of the switch spring 10 drives the switch seesaw 13 to rotate, and the positioning claw 1302 of the switch seesaw 13 sinks into the tooth groove of the inner core rod tooth surface 801, thereby limiting and positioning the inner core rod 8. According to this method and steps, it is convenient to adjust the different lengths of the inner core rod 8, and the length of the utility model can be adjusted.

[0024] An elastic pin 14 is transversely fixed to the middle section of the inner core rod 8 , and one end of a telescopic spring 15 is fixed to the elastic pin 14 , and the other end is fixed to a fixed tail plug 18 .

[0025] The telescopic spring 15 is sleeved inside the inner core rod 8 .

[0026] The rear end of the hollow square tube 17 is penetrated by a labor-saving slide bar 19, which is arranged vertically with the hollow square tube 17. The labor-saving slide bars 19 of different lengths have different strengths, and the longer the longer, the more labor-saving. The rear end of the hollow square tube 17 is transversely provided with a sliding hole for the labor-saving slide bar 19 to pass through.

[0027] The front end of the hollow square tube 17 is fixed with a protective sleeve 9, the inner core rod 8 is slidably arranged in the protective sleeve 9, and the rear end of the inner core rod 8 is fixed with a limiting sleeve 16. The limiting sleeve 16 can prevent the inner core rod 8 from being completely pulled out, and plays a role of limiting protection. The protective sleeve 9 can prevent the inner core rod 8 from shaking, and the stability is better.

[0028] A head gasket 5 and a compression spring 4 are provided between the front end of the inner core rod 8 and the rotating tooth head 2. The head gasket 5 is fixed to the front end of the inner core rod 8. One end of the compression spring 4 presses on the head gasket 5 and the other end presses on the rotating tooth head 2. The cooperation of the compression spring 4 and the head gasket 5 can prevent the rotating tooth head 2 from shaking, and the rotation is more stable during operation.

[0029] The claw force teeth 1 have various sizes and specifications. According to the size of the nut (nut), the claw force teeth 1 of different sizes can be replaced to cope with nuts (nuts) of different sizes, and the versatility is stronger.

Claims

1. A wrench that is easy to extend and change heads, comprising a hollow square tube (17) and an inner core rod (8), characterized in that: The inner core rod (8) is slidably sleeved in the hollow square tube (17), the front end of the inner core rod (8) is exposed outside the front end of the hollow square tube (17), the front end of the inner core rod (8) is fixed with a rotating tooth head (2) by a hexagonal screw (3), the outer side of the rotating tooth head (2) is provided with an outer arc tooth surface (201) protruding outward, one end of the rotating tooth head (2) is rotatably connected with a claw force tooth (1) by a rivet (7), the inner side of the claw force tooth (1) is provided with an inner arc tooth surface (101) opposite to the outer arc tooth surface (201), a torsion spring (6) is sleeved on the rivet (7), one end of the torsion spring (6) is connected to the claw force tooth (1), and the other end is connected to the rotating tooth head (2), a fixed tail plug (18) is fixed to the rear end of the hollow square tube (17), and a telescopic spring (15) is connected between the fixed tail plug (18) and the inner core rod (8).

2. A wrench that is easy to extend and change heads according to claim 1, characterized in that: The hollow square tube (17) is provided with a push switch for controlling the telescopic length of the inner core rod (8), the push switch comprising a switch protection cover (11) fixed on the side wall of the hollow square tube (17), a switch seesaw (13) rotatably connected inside the switch protection cover (11), a seesaw shaft (1301) rotatably connected to the switch protection cover (11) is provided on the middle section of the switch seesaw (13), a positioning claw (1302) is provided at one end of the switch seesaw (13), and a seesaw pressing portion (1303) is provided at the other end, and the inner core rod (8) is provided with a An inner core rod tooth surface (801) cooperates with the positioning claw (1302) for positioning. A switch spring (10) is provided between the switch seesaw (13) at one end of the positioning claw (1302) and the switch protection cover (11). One end of the switch spring (10) presses on the switch seesaw (13) and the other end presses on the switch protection cover (11). A switch button (12) is provided between the switch seesaw (13) at one end of the seesaw pressing portion (1303) and the switch protection cover (11). The switch button (12) is exposed to the outside of the switch protection cover (11).

3. A wrench that is easy to extend and change heads according to claim 1 or 2, characterized in that: An elastic pin (14) is transversely fixed to the middle section of the inner core rod (8); one end of a telescopic spring (15) is fixed to the elastic pin (14) and the other end is fixed to a fixed tail plug (18).

4. A wrench that is easy to extend and change heads according to claim 3, characterized in that: The telescopic spring (15) is sleeved inside the inner core rod (8).

5. A wrench that is easy to extend and change heads according to claim 4, characterized in that: A labor-saving slide bar (19) passes through the rear end of the hollow square tube (17), and the labor-saving slide bar (19) is vertically arranged with the hollow square tube (17).

6. A wrench that is easy to extend and change heads according to claim 5, characterized in that: A protective sleeve (9) is fixed to the front end of the hollow square tube (17), an inner core rod (8) is slidably arranged in the protective sleeve (9), and a limiting sleeve (16) is fixed to the rear end of the inner core rod (8).

7. A wrench that is easy to extend and change heads according to claim 6, characterized in that: A head gasket (5) and a compression spring (4) are provided between the front end of the inner core rod (8) and the rotating tooth head (2); the head gasket (5) is fixed to the front end of the inner core rod (8); one end of the compression spring (4) presses on the head gasket (5) and the other end presses on the rotating tooth head (2).

8. The wrench that is convenient for extension and head change according to claim 7, characterized in that: The claw force teeth (1) have various sizes, specifications and models.

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