Preset force wrench

Abstract

The present invention relates to the technical field of hardware tools, specifically a preset force wrench, including a handle body, a square block, a sound seat, a sealing spring, a torsion spring, etc. The handle body interacts with the square block, the sound seat, and the torsion spring. A sealing spring is sleeved on the outer side of the sound seat. A slot is provided on the outer ring of the sound seat close to the square block. A retaining spring is provided in the slot. A screw hole is provided on the side of the handle body. The screw hole is a countersunk screw hole. An adjustment screw is provided in the screw hole to fix the sound seat. Such a setting reduces internal parts, simplifies assembly, improves precision, and facilitates use.

Description

Technical Field

[0001] The invention relates to the technical field of hardware tools, in particular to a preset force wrench. Background Art

[0002] In recent years, in order to make it easier for general consumers to use hand tools, the hand tool manufacturing industry has launched a variety of hand tools that are easy to operate or have humanized functions.

[0003] China Publication Patent 2006200142910, Automatic Positioning Structure of Torque Wrench and Torque Wrench Sound Seat thereof, discloses an automatic positioning structure of a torque wrench, a compression spring is arranged between the sound seat of the torque wrench and the propulsion column, a seat is arranged at each end of the compression spring, at least one end face of the seat is provided with a positioning body, and a buffer sleeve is arranged around the sound seat, which solves the problems of accuracy and smoothness. However, it does not solve the problem of pipe wall wear caused by the back and forth movement of the sound seat during operation, thereby affecting the accuracy of the wrench. Moreover, during the use of the preset force wrench, deviations will occur due to wear. In addition to replacing parts, it is impossible to fine-tune the accuracy according to the current situation; furthermore, the installation relationship between internal parts may also affect the accuracy of the entire product. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a preset force wrench, which solves the problems of pipe wall wear and deviation during use mentioned in the above background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A preset force wrench comprises a handle, a sleeve, an adjustment handle, a handle body, a push rod, a torsion spring and a sound seat, wherein the handle is connected to one end of the handle body, the other end of the handle body is connected to the sound seat, the sound seat is connected to the push rod through a torsion spring, the sleeve is wrapped around the outside of the handle body, the sound seat, the torsion spring and the push rod, the adjustment handle is arranged on the outside of the push rod, one end of the sound seat is provided with a groove, four square blocks are placed in the groove, and the four square blocks are in contact with the handle body; the other end of the sound seat is in contact with the torsion spring; a sealing spring is sleeved on the outside of the sound seat, and a clamping groove is opened on the outer circle of the side of the sound seat close to the four square blocks, and a retaining spring is arranged in the clamping groove; a screw hole is provided on the side of the handle body, and an adjusting nut is arranged in the screw hole, and the adjusting nut passes through the handle body and presses against the inner wall of the sleeve.

[0009] Preferably, the sound seat comprises a body, the body is cylindrical, a countersunk hole is provided at the end of the body, and a chamfer is performed on the head end of the body and a groove is provided.

[0010] Preferably, the groove is composed of a groove bottom surface and a first surface, a second surface, a third surface and a fourth surface. The first surface and the second surface are arranged opposite to each other with an angle of 60-90° therebetween. The third surface and the fourth surface are arranged opposite to each other with an angle of 4° therebetween.

[0011] Preferably, the handle body is provided with protrusions at positions corresponding to the first surface and the second surface, and the protrusions form an angle of 30-45° with the axis of the handle body.

[0012] Preferably, a steel ball is provided between the sleeve and the handle body.

[0013] Preferably, the adjusting nut is a countersunk screw, and the top of the adjusting nut is spherical.

[0014] Preferably, a gasket is arranged between the torsion spring and the sealing spring, the gasket comprises a gasket body and a gasket fixing part, the front surface of the gasket body is fixedly connected to the gasket fixing part, the outer surface of the gasket fixing part is provided with a plurality of flexible protrusions, the gasket fixing part is a cylinder, and the diameter decreases from one end connected to the gasket body to the other end.

[0015] Preferably, the adjustment handle and the sleeve are provided with scales.

[0016] Preferably, the sealing spring is made of 65Mn with a hardness of 45-50°, and there is no gap between the coils of the sealing spring.

[0017] Preferably, a limiting screw is provided on the propulsion rod.

[0018] (III) Beneficial effects

[0019] The present invention provides a preset force wrench. It has the following beneficial effects:

[0020] By adjusting the interaction between the nut, square block, sound seat, sealing spring and sleeve, the assembly parts of the product are reduced, the cost is reduced, the wear between the components is reduced, and the possibility of inaccurate precision is reduced. In addition, the precision fine-tuning during assembly is optimized. During use, the precision can also be adjusted according to the actual situation through corresponding equipment and personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention;

[0022] Figure 2 It is the internal structure diagram of the present invention;

[0023] Figure 3 It is the front view of the sound seat;

[0024] Figure 4 It is the side view of the sound seat;

[0025] Figure 5 This is a top view of the sound seat;

[0026] Figure 6 Schematic diagram of the structure of the gasket.

[0027] In the figure: 1 handle, 2 sleeve, 3 adjustment handle, 4 adjustment nut, 5 sound seat, 6 sealing spring, 7 retaining ring, 8 torsion spring, 9 gasket, 10 limit screw, 11 push rod, 12 handle body, 13 square block, 14 screw hole, 15 protrusion, 16 steel ball, 5-1 groove, 5-2 slot, 5-3 countersunk hole, 5-4 body, 5-5 first surface, 5-6 second surface, 5-7 third surface, 5-8 fourth surface, 9-1 gasket body, 9-2 gasket fixing part, 9-3 flexible protrusion. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The embodiment of the present invention provides a preset force wrench, such as Figure 1 , 2 As shown, it includes a handle 1, a sleeve 2, an adjustment handle 3, a handle body 12, a push rod 11, a torsion spring 8 and a sound seat 5, which are connected to each other. The handle 1 is connected to one end of the handle body 12 through a nut, and the other end of the handle body 12 is in contact with the sound seat 5. The sound seat 5 is connected to the push rod 11 through the torsion spring 8. The sleeve 2 is wrapped around the outside of them to protect the internal components, and the sleeve 2 is flat to facilitate the user to take it for work. The adjustment handle 3 is arranged on the outside of the push rod 11, and the adjustment handle 3 and the sleeve 2 are provided with scales for determining the preset force; as shown Figure 3 , 4As shown in Figure 5, a groove 5-1 is provided at one end of the sound seat 5, and a square block 13 is placed in the groove 5-1. The square block 13 is in contact with the handle body 12. Through the action of the handle body 12 and the groove 5-1, the square block 13 is fixed in the groove 5-1 under force; the other end of the sound seat 5 is in contact with the torsion spring 8. When the wrench is preset with force, the torsion spring 8 is compressed to act on the sound seat 5; a sealing spring 6 is sleeved on the outer side of the sound seat 5. On the one hand, the sealing spring 6 is easy to install (can be bent), and on the other hand, the existence of the sealing spring 6 can ensure that the sound seat 5 Linear movement; a slot 5-2 is provided on the outer ring of one side of the sound seat 5 close to the square block 13, and a retaining spring 7 is arranged in the slot 5-2. The existence of the retaining spring 7 prevents the sealing spring 6 from moving forward and prevents the sealing spring 6 from detaching from the sound seat 5; a screw hole 14 is provided on the side of the handle body 12, and the screw hole 14 is a countersunk screw hole. An adjusting nut 4 is arranged in the screw hole 14, and the adjusting nut 4 is a countersunk screw. The top of the adjusting nut 4 is spherical, and the adjusting nut 4 passes through the handle body and presses on the inner wall of the sleeve 2. The adjusting nut 4 is sunk in the handle body 12 to prevent the exposed end from contacting the sleeve 2 and affecting the working function;

[0030] The sound seat 5 includes a body 5-4, which is cylindrical. A countersunk hole 5-3 is provided at the end of the body 5-4 to save materials. When the sound seat 5 is forged, it is easy to fill it up and it is not easy to produce material shortage, so as to ensure the normal operation of the later work. The head end of the body 5-4 is chamfered and a groove 5-1 is provided. The chamfering treatment avoids the friction between the sound seat 5 and the inner side of the sleeve 2 during the later work.

[0031] The groove 5-1 is composed of a groove bottom surface and a first surface 5-5, a second surface 5-6, a third surface 5-7, and a fourth surface 5-8. Figure 3 The first surface 5-5 and the second surface 5-6 are arranged opposite to each other, and the angle between them is 60-90°. Figure 4 The third surface 5-7 and the fourth surface 5-8 are arranged opposite to each other, and the angle between them is 4°. This is because when the preset force wrench is working, the four blocks 13 are flipped, which causes a prompt sound. The angle between the third surface 5-7 and the fourth surface 5-8 is 4°, so that the four blocks 13 can be restricted in this direction and will not move too much. The 4° is reserved to take into account the expansion caused by thermal expansion and contraction, which may affect the normal flipping of the four blocks 13; the angle between the first surface 5-5 and the second surface 5-6 is 60-90°. Within this angle, the four blocks 13 can flip with the handle body 12, but it is controlled at 90° to prevent the four blocks 13 from flipping too much and losing the interaction force with the handle body 12, resulting in failure of the wrench function.

[0032] like Figure 2The handle body 12 is provided with protrusions 15 corresponding to the first surface 5-5 and the second surface 5-6. The protrusions 15 form an angle of 30-45° with the axis of the handle body 12, forming a clamp-like shape, which is also used to prevent the handle body 12 from being out of contact with the square block 13.

[0033] like Figure 1 A plurality of steel balls 16 are arranged between the sleeve 2 and the handle body 12 to balance the handle body 12 and prevent it from shaking in the tube.

[0034] like Figure 2 A gasket 9 is arranged between the torsion spring 8 and the sealing spring 6. The gasket 9 consists of a gasket body 9-1 and a gasket fixing part 9-2. When viewed from the side, the gasket body 9-1 and the gasket fixing part 9-2 form a cut T-shape, and they are fixedly connected. The gasket fixing part 9-2 is used to be clamped in the countersunk hole 5-3 of the sound seat 5, so that the outer surface of the gasket fixing part 9-2 is provided with a plurality of flexible protrusions 9-3. The gasket fixing part 9-2 is a cylinder, and the diameter changes from large to small from one end connected to the gasket body 9-1 to the other end, so that the entire gasket 9 will be perfectly matched on the sound seat 5, avoiding the head of the torsion spring 8 and the head of the sealing spring 6 from contacting each other, thereby hooking each other or the head of the torsion spring 8 and the head of the sealing spring 6 being mutually wrapped.

[0035] The material of the sealing spring 6 is 65Mn, and the hardness is 45-50°, and there is no gap between the coils of the sealing spring 6. In this way, when installing the sealing spring 6, the sealing spring 6 can be bent according to the actual situation, so that the installation is easier.

[0036] The push rod 11 is provided with a limit screw 10 to prevent the adjustment handle 3 from applying excessive pressure to the torsion spring 8 and the sealing spring 6, thereby affecting the accuracy.

[0037] Working principle: When the present invention is working, during the assembly process, the adjustment nut 4 is adjusted to make the handle body 12 shift sideways, act on the square block 13, and make the square block 13 tilt sideways, so that the square block 13 has lateral pressure, and the square block 13 then acts on the sound seat 5, so that the sound seat 5 will act on the sealing spring 6, so that the sealing spring 6 and the sleeve 2 generate friction, change the direction of the fixed sound seat 5, reduce the original parts and achieve the effect of fixing the sound seat 5. When working, the adjustment handle 3 is used to select the torque to be set, and the handle 1 acts on the nut to generate a certain force. When the force reaches the preset value, the force on the handle 1 will interact along the handle body 12, the sound seat 5, and the torsion spring 8, so that the inclined square block 13 is subjected to force and the groove 5-1 of the sound seat 5 to produce a collision sound, thereby reminding the user that the preset value has been reached to avoid excessive force causing the nut to be scrapped due to thread slippage.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A preset force wrench, comprising a handle (1), a sleeve (2), an adjustment handle (3), a handle body (12), a push rod (11), a torsion spring (8) and a sound seat (5), wherein the handle (1) is connected to one end of the handle body (12), the other end of the handle body (12) is connected to the sound seat (5), the sound seat (5) is connected to the push rod (11) via a torsion spring (8), the sleeve (2) is wrapped around the outside of the handle body (12), the sound seat (5), the torsion spring (8) and the push rod (11), and the adjustment handle (3) is arranged on the outside of the push rod (11), characterized in that: A groove (5-1) is provided at one end of the sound seat (5), a square block (13) is placed in the groove (5-1), and the square block (13) is in contact with the handle body (12); the other end of the sound seat (5) is in contact with the torsion spring (8); a sealing spring (6) is sleeved on the outer side of the sound seat (5), and a groove (5-2) is provided on the outer ring of the side of the sound seat (5) close to the square block (13), and a retaining spring (7) is arranged in the groove (5-2); a screw hole (14) is provided on the side of the handle body (12), and an adjustment screw (4) is arranged in the screw hole (14), and the adjustment screw (4) passes through the handle body and presses on the inner wall of the sleeve (2).

2. The preset force wrench according to claim 1, characterized in that: The sound seat (5) comprises a body (5-4), the body (5-4) is cylindrical, a countersunk hole (5-3) is provided at the end of the body (5-4), and a chamfer is performed on the head end of the body (5-4) and a groove (5-1) is provided.

3. The preset force wrench according to claim 1, characterized in that: The groove (5-1) is composed of a groove bottom surface and a first surface (5-5), a second surface (5-6), a third surface (5-7), and a fourth surface (5-8); the first surface (5-5) and the second surface (5-6) are arranged opposite to each other, and the angle between them is 60-90°; the third surface (5-7) and the fourth surface (5-8) are arranged opposite to each other, and the angle between them is 4°.

4. The preset force wrench according to claim 1, characterized in that: The handle body (12) is provided with protrusions (15) at positions corresponding to the first surface (5-5) and the second surface (5-6), and the protrusions (15) form an angle of 30-45° with the axis of the handle body (12).

5. The preset force wrench according to claim 1, characterized in that: A steel ball (16) is arranged between the sleeve (2) and the handle body (12).

6. The preset force wrench according to claim 1, characterized in that: The adjusting screw (4) is a countersunk screw, and the top of the adjusting screw (4) is spherical.

7. The preset force wrench according to claim 1, characterized in that: A gasket (9) is arranged between the torsion spring (8) and the sealing spring (6), the gasket (9) comprising a gasket body (9-1) and a gasket fixing part (9-2), the front surface of the gasket body (9-1) is fixedly connected to the gasket fixing part (9-2), the outer surface of the gasket fixing part (9-2) is provided with a plurality of flexible protrusions (9-3), and the gasket fixing part (9-2) is a cylinder, the diameter of which decreases from one end connected to the gasket body (9-1) to the other end.

8. The preset force wrench according to claim 1, characterized in that: The adjustment handle (3) and the sleeve (2) are provided with scales.

9. The preset force wrench according to claim 1, characterized in that: The material of the sealing spring (6) is 65Mn, with a hardness of 45-50°, and there is no gap between the turns of the sealing spring (6).

10. The preset force wrench according to claim 1, characterized in that: The propulsion rod (11) is provided with a limit screw (10).

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