A torque wrench

Abstract

The utility model relates to a wrench technical field, specifically is a kind of torque wrench, including jaw head and handle, it is characterized by: the jaw head tail end can be assembled and connected with swing bar, the handle inside hollow and tail end are equipped with force sleeve;The connecting place of jaw head tail end and swing bar is provided with buckle assembly, the fixation of both is realized, fixed pin is provided on the handle, and the pivot connection of the assemblability between swing bar and handle is realized;The jaw head is first jaw head, second jaw head or third jaw head, first jaw head, second jaw head or third jaw head are all by jaw and chucking part component, the utility model is individually set according to the structure of target connecting piece the jaw that adapts its shape, can be closely engaged with target connecting piece.In assembly, according to the torque requirement of target connecting piece, predetermined torque value is applied torque, and assembly reliability is improved.

Description

Technical Field

[0001] This utility model relates to the field of wrench technology, and more specifically, to a torque wrench. Background Technology

[0002] A wrench is a common installation and assembly tool. It is a hand tool that uses the lever principle to tighten or loosen bolts, screws, nuts and other threaded fasteners that hold bolts or nuts in open or recessed holes.

[0003] When assembling the target connector, a wrench is usually used. Figure 12 As shown in the figure, the assembly is performed, but during assembly, due to the inability to accurately control the torque force, the assembly may not be tight. If it is forcibly tightened, the torque force may be too large, causing damage to the structure. At the same time, the existing wrench and pliers jaw structure cannot perfectly fit the shape of the target connector, and slippage may occur during assembly. Utility Model Content

[0004] The main objective of this invention is to provide a torque wrench that can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a torque wrench, including a pliers head and a handle, characterized in that: a rocker arm can be assembled and connected to the tail end of the pliers head, and the handle is hollow inside and has a force-applying sleeve at its tail end; A snap-fit ​​assembly is provided at the connection between the tail end of the pliers head and the swing arm to fix the two together. A fixing pin is provided on the handle to realize the pivotal connection between the swing arm and the handle for assembly. The pliers head is a first pliers head, a second pliers head, or a third pliers head, and each of the first pliers head, the second pliers head, or the third pliers head consists of jaws and a clamping part.

[0006] Preferably, the jaws of the first pliers are shaped like a retaining ring, the inner wall of the retaining ring is configured as a clamping part, and a groove is provided at the junction of the tail end of the jaws and the connecting shaft for fitting the inclined groove at the connection of the connector.

[0007] Preferably, the jaws of the second pliers are U-shaped, and the clamping part is disposed on the inner walls of both sides of the second pliers, and the clamping part is shaped as a clamping block.

[0008] Preferably, the third clamp head is in the shape of a ring, and the inner wall of the ring is in the shape of a frustum. The clamping part consists of two elastic fixing rods, which are respectively installed in the middle of both sides of the clamp jaw. The elastic fixing rod includes a bushing and a first locking rod. The bushing is fixed to the jaws of the jaws, and the first locking rod is slidably connected inside the bushing. The first locking rod slides through the side wall of the jaws of the jaws. An mounting sleeve is fixedly connected to the rod of the first locking rod. A spring is provided inside the bushing. The spring is sleeved on the first locking rod, with one end fixed to the mounting sleeve and the other end fixed to the bottom of the inner wall of the bushing.

[0009] Preferably, the swing arm has a locking hole inside, and the locking hole has an inlet, so that the locking hole is connected to the locking slot. The second locking rod passes through the inlet and stays inside the locking hole. By rotating the second locking rod vertically, the connecting shaft and the swing arm are locked together.

[0010] Preferably, the buckle assembly includes a rotating shaft, and the tail end of the clamp head is integrally provided with a connecting shaft. The connecting shaft is hollow inside and the tail end is rotatably connected to the rotating shaft. The rotating shaft is fixedly connected to a second clamping rod at one end outside the connecting shaft and to a worm gear at the other end inside the connecting shaft.

[0011] Preferably, the end of the swing arm is provided with a slot that can be connected to the connecting shaft. Both the slot and the connecting shaft are provided with pin holes, and a fixing pin is provided in the pin hole. The fixing pin limits the swing arm to swing within the handle.

[0012] Preferably, the buckle assembly further includes a torsion bar, which is rotatably connected to the connecting shaft, and a worm gear is fixedly connected to the bottom end of the torsion bar, which is driven by a worm wheel. A limiting sleeve is fixedly connected to the connecting shaft. The torsion bar is rotatably connected to the limiting sleeve. A gear is fixedly connected to the rod body of the torsion bar located inside the limiting sleeve. Two rotating rods are rotatably connected to the inner wall of the limiting sleeve. A lever is fixedly connected to the two rotating rods. The ends of the two levers abut against the teeth of the gear. A torsion spring is sleeved on the rotating rod.

[0013] Compared with the prior art, the present invention has the following beneficial effects: Depending on the different structures of the target connectors, a separate clamping jaw adapted to its shape is set up to increase the biting force between the wrench and the connector during assembly, thereby improving assembly reliability.

[0014] 2. When the torsion bar is rotated, the internal gears rotate, and the teeth exert force on the lever. When the teeth disengage from the lever, the lever will stop on the next tooth under the limit of the torsion spring. Every time the operator rotates the torsion bar, a jerking sensation will be produced. The number of rotations of the torsion bar and the corresponding number of rotations of the lever are recorded and marked on the limiting sleeve in a scale manner. This makes it easy for the operator to identify the rotation angle of the internal lever, thereby controlling the state of the first locking lever in the locking hole, realizing assembly and fixation. The simplified workflow makes fixing convenient. During equipment processing, the lever and teeth are locked together, realizing the limiting function and preventing the torsion bar from rotating under the action of external force.

[0015] 3. By providing different types of pliers heads and purchasing wrenches with different torque values, different types of wrenches and wrench heads can be freely assembled to handle different specifications of workpieces, reducing the number and types of wrenches to purchase and reducing processing costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a torque wrench according to the present invention; Figure 2 This is a schematic diagram of the structure of the first, second, and third jaws of a torque wrench according to this utility model. Figure 3 This is a schematic diagram of the internal structure of the lever and force-applying sleeve of a torque wrench according to the present invention; Figure 4 This is a schematic diagram of the snap-fit ​​assembly of a torque wrench according to the present invention; Figure 5 This is a schematic diagram of the locking hole and inlet of a torque wrench according to the present invention; Figure 6 This utility model Figure 3 Enlarged structural diagram at point A; Figure 7 This is a schematic diagram of the internal structure of the limiting sleeve of a torque wrench according to the present invention; Figure 8 This is a schematic diagram of the structure of the corresponding machined part of the second wrench of the torque wrench according to the present invention; Figure 9 This is a schematic diagram of the structure of the first wrench corresponding to the machining part of the torque wrench of this utility model; Figure 10 This is a schematic diagram of the structure of the corresponding machined part of the third wrench of the torque wrench according to this utility model; Figure 11 This is a schematic diagram of the elastic fixing rod of a torque wrench according to the present invention; Figure 12 This is a schematic diagram of the original wrench structure of a torque wrench according to this utility model.

[0017] In the diagram: 1. Pliers head; 101. First pliers head; 1011. Groove; 102. Second pliers head; 1021. Clamping block; 103. Third pliers head; 1031. Elastic fixing rod; 1032. First clamping rod; 1033. Bushing; 1034. Spring; 1035. Mounting sleeve; 2. Handle; 3. Force-applying sleeve; 4. Swing rod; 5. Snap-fit ​​assembly; 501. Torsion bar; 502. Rotating shaft; 503. Worm gear; 504. Worm wheel; 505. Second clamping rod; 506. Clamping hole; 507. Inlet; 508. Limiting sleeve; 509. Gear; 510. Toggle lever; 511. Rotating rod; 512. Torsion spring; 6. Fixing pin; 7. Connecting shaft; 8. Pliers jaws; 9. Clamping part. Detailed Implementation

[0018] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model. Example

[0019] like Figures 1 to 12 As shown, a torque wrench includes a pliers head 1 and a handle 2. The pliers head 1 has three different shapes for processing different types of workpieces. A rocker arm 4 can be attached to the tail end of the pliers head 1. The handle 2 is hollow inside and has a torque-applying sleeve 3 at its tail end. Figure 3 It can be seen that the structure between the force-applying sleeve 3 and the rocker arm 4 works by applying force to the rocker arm 4 when the wrench is rotated. When the applied torque exceeds the preset force of the spring, a momentary "disengagement" action will occur inside the mechanism. The push rod hits the outer shell and produces sound and tactile feedback, indicating that the set torque has been reached. The force-applying sleeve 3 adjusts the preset force by rotating the bottom adjustment spring. This structure is existing technology and will not be described in detail here.

[0020] A snap-fit ​​assembly 5 is provided at the connection between the tail end of the pliers head 1 and the swing arm 4 to fix the two together. A fixing pin 6 is provided on the handle 2 to realize the pivotal connection between the swing arm 4 and the handle 2 for assembly. The function of the fixing pin 6 is to limit the swing arm 4 within the handle 2 and to swing the swing arm 4 within the handle 2 with the center of the fixing pin 6 as the swing point. When replacing the pliers head 1 later, the fixing pin 6 can be installed. The fixing pin 6 and the pin hole are interference fit. During assembly, the bottom of the fixing pin 6 needs to be tapped with a tool to shake it out. The three shapes of the pliers head 1 can be specifically set as the first pliers head 101, the second pliers head 102 or the third pliers head 103, each consisting of pliers jaws 8 of different shapes and clamping parts 9. Different types of pliers heads are used for the assembly of different workpieces, which can be the assembly between target connecting parts.

[0021] In this embodiment, the jaws 8 of the first pliers 101 are shaped like retaining rings, the inner wall of the retaining ring is configured as a clamping part 9, and a groove 1011 is provided at the junction of the tail end of the jaws and the connecting shaft 7. Figure 9 As can be seen, the target connector has a smooth surface and is fitted with the shape of the first clamp head 101. The retaining ring is composed of a circle and a rectangle. The rectangular part is used to clamp the side wall of the target connector. The groove 1011 fits into the inclined groove of the target connector, which has an auxiliary function and avoids slippage.

[0022] In this embodiment, the jaws 8 of the second pliers 102 are U-shaped, and the clamping parts 9 are in the shape of clamping blocks 1021, respectively disposed on the inner walls of both sides of the jaws 8. Figure 8 It can be seen that the second clamp head, model 102, corresponds to Figure 8 The shape of the workpiece: the bottom of this target connector has an annular recessed groove, so the U-shaped jaws and the locking block 1021 can firmly clamp the groove for processing.

[0023] In this embodiment, the third jaw 103 is annular in shape, with the inner wall of the annulus being frustoconical. The clamping part consists of two elastic fixing rods 1031, which are respectively installed at the quadrant points on both sides of the jaws. Figure 10 As can be seen, the target connector has two recessed holes, and the top of the target connector is cylindrical. The jaws of the ring can fit together. The structure of the elastic fixing rod 1031 is a combination of the bushing 1033 and the first clamping rod 1032. A spring 1034 is connected between the sliding rod and the sliding sleeve. This structure is also widely used in the market, so I will not go into details here. The elastic fixing rod 1031 is clamped in the recessed hole for processing.

[0024] It should also be noted that, Figure 12 The wrench shape is shown in the background art for the original assembly target connector. Figures 8 to 10 It is an improved wrench shape. Example

[0025] Based on the above embodiments, in this embodiment, the buckle assembly 5 includes a rotating shaft 502. The tail end of the clamp head 1 is integrally provided with a connecting shaft 7. The connecting shaft 7 is hollow inside and the tail end is rotatably connected to the rotating shaft 502. The rotating shaft 502 is fixedly connected to a second locking rod 505 at one end outside the connecting shaft 7 and to a worm gear 504 at one end inside the connecting shaft 7. The end of the swing rod 4 is provided with a slot that can be connected to the connecting shaft 7. Both the slot and the connecting shaft 7 are provided with pin holes. A fixing pin 6 is provided on the pin holes. The fixing pin 6 limits the swing rod 4 to swing within the handle 2. The buckle assembly 5 also includes a torsion bar 501. The torsion bar 501 is rotatably connected to the connecting shaft 7. The bottom end of the torsion bar 501 is fixedly connected to a worm gear 503. The worm gear 503 is driven to connect with the worm gear 504. Through the above-described structural connection relationship, it can be seen that when the torsion bar 501 is rotated, it drives the internal worm gear 504 and worm gear 503 to cooperate, thereby driving the rotating shaft 502 and the second locking rod 505 to rotate.

[0026] A limiting sleeve 508 is fixedly connected to the connecting shaft 7. A torsion bar 501 is rotatably connected to the limiting sleeve 508. A gear 509 is fixedly connected to the rod body of the torsion bar 501 inside the limiting sleeve 508. Two rotating rods 511 are rotatably connected to the inner wall of the limiting sleeve 508. A lever 510 is fixedly connected to the two rotating rods 511. The ends of the two levers 510 abut against the teeth of the gear 509. A torsion spring 512 is sleeved on the rotating rod 511. Figure 7 As can be seen, whenever the torsion bar 501 is rotated, the internal gear 509 rotates, and the teeth exert force on the lever 510. When the teeth disengage from the lever 510, the lever will stop on the next tooth under the limit of the torsion spring 512. Therefore, whenever the operator rotates the torsion bar 501, a jerking sensation will be produced. The number of rotations of the torsion bar 501 and the corresponding number of rotations of the lever 511 are recorded and marked on the limiting sleeve 508 in a scale manner. This makes it easy for the operator to identify the rotation angle of the internal lever 511, thereby controlling the state of the second locking lever 505 in the locking hole 506, realizing assembly and fixation. The simplified workflow makes fixing convenient. In addition, during equipment processing, the lever 510 and the teeth are locked together, which also realizes the limiting function. At the same time, the two levers 510 are set symmetrically so that the gear 509 can feel the jerking sensation when rotating forward or backward. Example

[0027] Based on the above embodiments, in this embodiment, the swing arm 4 has an inner locking hole 506, and the locking hole 506 has an inlet 507 that communicates with the locking groove. The second locking rod 505 passes through the inlet 507 and stays inside the locking hole 506. By vertically rotating the second locking rod 505, the connecting shaft 7 and the swing arm 4 are locked together. During assembly, the rotation angle of the second locking rod 505 is controlled so that the shape of the second locking rod 505 fits the inlet 507, thus completing the separation of the connecting shaft 7 from the swing arm 4. When fixing, after the second locking rod 505 passes through the inlet 507, it is rotated at a certain angle so that the second locking rod 505 cannot pass through the inlet 507. With the help of the fixing pin 6, quick fixing is achieved. Therefore, only wrenches with different torque values ​​and wrench heads of different shapes need to be produced to achieve free assembly, reducing the number and models of wrenches to be purchased and reducing processing costs.

[0028] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. Any obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A torque wrench, comprising a plier head (1) and a handle (2), characterized in that: The pliers (1) is fitted with a swing arm (4) at the tail end, and the handle (2) is hollow inside and has a force-applying sleeve (3) at the tail end. A buckle assembly (5) is provided at the connection between the tail end of the pliers (1) and the swing arm (4) to fix the two. A fixing pin (6) is provided on the handle (2) to realize the assembly pivot connection between the swing arm (4) and the handle (2). The pliers (1) is a first pliers (101), a second pliers (102), or a third pliers (103), and each of the first pliers (101), the second pliers (102), or the third pliers (103) is composed of a jaw (8) and a clamping part (9).

2. A torque wrench according to claim 1, characterized in that: The jaw (8) of the first pliers (101) is shaped like a retaining ring, and the inner wall of the retaining ring is configured as a clamping part (9). A groove (1011) is provided at the junction of the tail end of the jaw (8) and the connecting shaft (7) for fitting the inclined groove of the target connector.

3. A torque wrench according to claim 1, characterized in that: The jaws (8) of the second pliers (102) are U-shaped, and the clamping part (9) is provided on the inner walls of both sides of the second pliers (102). The clamping part is shaped as a clamping block (1021).

4. A torque wrench according to claim 1, characterized in that: The third clamp head (103) is in the shape of a ring, and the inner wall of the ring is in the shape of a frustum. The clamping part (9) consists of two elastic fixing rods (1031), which are respectively installed in the middle of both sides of the clamp mouth (8). The elastic fixing rod (1031) includes a bushing (1033) and a first locking rod (1032). The bushing (1033) is fixed on the jaw (8). The first locking rod (1032) is slidably connected inside the bushing (1033). The first locking rod (1032) slides through the side wall of the jaw (8). An installation sleeve (1035) is fixedly connected to the rod of the first locking rod (1032). A spring (1034) is provided inside the bushing (1033). The spring (1034) is sleeved on the first locking rod (1032). One end of the spring (1034) is fixed on the installation sleeve (1035), and the other end is fixed on the bottom of the inner wall of the bushing (1033).

5. A torque wrench according to claim 1, characterized in that: The end of the swing arm (4) is provided with a slot for docking with the connecting shaft (7). Both the slot and the connecting shaft (7) are provided with pin holes. A fixing pin (6) is provided on the pin hole. The fixing pin (6) limits the swing arm (4) to swing within the handle (2).

6. A torque wrench according to claim 5, characterized in that: The buckle assembly (5) includes a rotating shaft (502). The tail end of the clamp head (1) is integrally provided with a connecting shaft (7). The connecting shaft (7) is hollow inside and the tail end is rotatably connected to the rotating shaft (502). The rotating shaft (502) is fixedly connected to a second clamping rod (505) at one end outside the connecting shaft (7) and to a worm gear (504) at one end inside.

7. A torque wrench according to claim 6, characterized in that: The swing rod (4) has a locking hole (506) inside, and the locking hole (506) has an inlet (507) so that the locking hole (506) is connected to the locking groove. The second locking rod (505) passes through the inlet (507) and stays inside the locking hole (506). The second locking rod (505) is rotated vertically to lock the connecting shaft (7) and the swing rod (4).

8. A torque wrench according to claim 7, characterized in that: The buckle assembly (5) also includes a torsion bar (501), which is rotatably connected to the connecting shaft (7). The bottom end of the torsion bar (501) is fixedly connected to a worm gear (503), which is drivenly connected to a worm wheel (504). A limiting sleeve (508) is fixedly connected to the connecting shaft (7). The torsion bar (501) is rotatably connected to the limiting sleeve (508). A gear (509) is fixedly connected to the rod body of the torsion bar (501) inside the limiting sleeve (508). Two rotating rods (511) are rotatably connected to the inner wall of the limiting sleeve (508). A lever (510) is fixedly connected to the two rotating rods (511). The ends of the two levers (510) abut against the teeth of the gear (509). A torsion spring (512) is sleeved on the rotating rod (511).

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