Force limiting wrench

Abstract

The utility model discloses a force limiting wrench, which relates to the technical field of wrenches, and comprises a handle, a rotating disc, a rotating disc cover plate, a push pin, a spring, a spring top plate, a pin shaft, an adjusting knob and a fixing ring, the rotating disc and the rotating disc cover plate are arranged at one end of the handle, and the adjusting knob is arranged at the other end of the handle. The push needle, the spring, the spring top plate and the pin shaft are all arranged in the handle, the spring is arranged at one end of the push needle in a sleeved mode, the spring top plate is arranged at the end, away from the push needle, of the spring, and the fixing ring is arranged at one end of the adjusting knob. When the wrench is used, the torque can be adjusted through the adjusting knob, so that the torque requirements of different products are met.

Description

Technical Field

[0001] This utility model relates to the field of wrench technology, specifically a force-limiting wrench. Background Technology

[0002] In dental products such as ultrasonic scalers, root canal scalpels, and gutta-percha filling instruments, a front-end component is threadedly connected to the main unit. A certain torque is required to tighten this component before use. However, existing wrenches cannot adjust the torque as needed. If the tightening torque is too low, the front-end component may loosen during use. Conversely, if the tightening torque is too high, frequent use can cause stripping of the threads, damaging the front-end component or the main unit.

[0003] Based on this, a force-limiting wrench is now provided that can eliminate the drawbacks of existing devices. Utility Model Content

[0004] The purpose of this invention is to provide a force-limiting wrench to solve the problems in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A force-limiting wrench includes a handle, a rotating disk, a rotating disk cover, a push pin, a spring, a spring top plate, a pin, an adjusting knob, and a retaining ring. The rotating disk and the rotating disk cover are located at one end of the handle, and the adjusting knob is located at the other end of the handle. The push pin, the spring, the spring top plate, and the pin are all located inside the handle. The spring is sleeved on one end of the push pin, the spring top plate is located at the end of the spring away from the push pin, and the retaining ring is located at one end of the adjusting knob.

[0007] Based on the above technical solutions, this utility model also provides the following optional technical solutions:

[0008] In one alternative: one end of the handle is provided with a first circular hole and a second circular hole concentrically, one side of the first circular hole is provided with a third circular hole along the handle axis, one end of the third circular hole is provided with a fourth circular hole, the end of the fourth circular hole away from the third circular hole is provided with a first threaded hole, the outside of the first threaded hole is provided with an external thread concentric with it, one end of the external thread is provided with a first cylindrical surface, the first cylindrical surface is engraved with numbers and scales, and the side of the first cylindrical surface is provided with an elongated hole penetrating the fourth circular hole and the first cylindrical surface.

[0009] In one alternative: the bottom of the rotating disk is provided with a first disk, the first disk is provided with a plurality of slots for fixing the front end parts of the dental product, the first disk is provided with a second disk, the second disk is provided with a first gear platform, the first gear platform is gear-shaped, the first gear platform is composed of a top edge and a stop edge, and the first gear platform is provided with a central threaded hole concentric with the first disk.

[0010] In one alternative: the rotary disk cover plate is provided with a first threaded post on the side of the rotary disk, and the rotary disk cover plate is provided with a fifth circular hole and a sixth circular hole for installing a locking tool on the side opposite to the first threaded post.

[0011] In one alternative embodiment: the pusher includes a first cylinder, a second cylinder, and a third cylinder, the first cylinder, the second cylinder, and the third cylinder being arranged axially along the handle, the second cylinder being disposed between the first cylinder and the third cylinder, and one end of the spring being sleeved on the outside of the third cylinder.

[0012] In one alternative: the spring top plate is a cylindrical structure, and the spring top plate is provided with a through mounting hole for mounting a pin.

[0013] In one alternative: the adjustment knob is a hollow cylindrical structure, and a second threaded hole is provided on the inner side of the adjustment knob, and an annular limiting block is provided on one side of the second threaded hole.

[0014] In one alternative: the fixing ring has a second threaded post on the side near the adjusting knob, and the fixing ring has a seventh and eighth circular holes for installing a locking tool on the side opposite to the second threaded post.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. This utility model, through the cooperation between the handle, rotating disk, rotating disk cover plate, push pin, spring, spring top plate, pin shaft, adjusting knob and fixing ring, enables the wrench to adjust the torque by adjusting the knob during use, so as to meet the torque requirements of different products.

[0017] 2. This utility model improves the practicality of the wrench by designing the slots on the rotating disk for fixing the front end parts of dental products to be the same or different in shape and size as needed. At the same time, the slots are designed so that the front end parts of the product can only be installed in one direction, which can play a foolproof role and prevent the wrench from being used incorrectly. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the disassembled structure of the parts of this utility model.

[0020] Figure 3 This is a schematic diagram of the handle in this utility model.

[0021] Figure 4 This is a schematic diagram of the structure of this utility model in different usage states.

[0022] Figure reference numerals: 100, handle; 101, first circular hole; 102, second circular hole; 103, third circular hole; 104, fourth circular hole; 105, first threaded hole; 106, oblong hole; 107, external thread; 108, first cylindrical surface; 200, rotating disk; 21, first disk; 22, second disk; 23, first gear platform; 211, slot; 231, top edge; 232, flange; 233, center threaded hole; 300, rotating disk cover plate. ; 301, First threaded post; 302, Fifth circular hole; 303, Sixth circular hole; 400, Push pin; 401, First cylinder; 402, Second cylinder; 403, Third cylinder; 500, Spring; 600, Spring top plate; 601, Mounting hole; 700, Pin; 800, Adjusting knob; 801, Second threaded hole; 802, Annular limit block; 900, Fixing ring; 901, Second threaded post; 902, Seventh circular hole; 903, Eighth circular hole. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] In one embodiment, such as Figure 1 and Figure 2 As shown, a torque-limiting wrench includes a handle 100, a rotating disk 200, a rotating disk cover plate 300, a push pin 400, a spring 500, a spring top plate 600, a pin 700, an adjusting knob 800, and a retaining ring 900. The rotating disk 200 and the rotating disk cover plate 300 are located at one end of the handle 100, and the adjusting knob 800 is located at the other end of the handle 100. The push pin 400, spring 500, spring top plate 600, and pin 700 are all located inside the handle 100. The spring 500 is sleeved on one end of the push pin 400, and the spring top plate 600 is located at the end of the spring 500 away from the push pin 400. The retaining ring 900 is located at one end of the adjusting knob 800. In use, the part to be tightened is fixed by the rotating disk 200, and then tightened by rotating the handle 100. The torque of the wrench can be adjusted by rotating the adjusting knob 800.

[0025] In one embodiment, such as Figure 3As shown, one end of the handle 100 has a concentric first circular hole 101 and a second circular hole 102. A third circular hole 103 along the axial direction of the handle 100 is provided on one side of the first circular hole 101. A fourth circular hole 104 is provided at one end of the third circular hole 103. A first threaded hole 105 is provided at the end of the fourth circular hole 104 away from the third circular hole 103. An external thread 107 concentric with the first threaded hole 105 is provided on the outside of the first threaded hole 105. A first cylindrical surface 108 is provided at one end of the external thread 107. Numbers and scales are engraved on the first cylindrical surface 108. The cylindrical surface 108 has an elongated hole 106 on its side that passes through the fourth circular hole 104 and the first cylindrical surface 108. The first circular hole 101 is used to install the rotating disk 200, the second circular hole 102 is used to install the rotating disk cover plate 300, the third circular hole 103 is used to install the push pin 400, the fourth circular hole 104 is used to install the spring 500 and the spring top plate 600, the first threaded hole 105 is used to install the retaining ring 900, the elongated hole 106 is used to install the pin 700, and the external thread 107 is used to install the adjusting knob 800.

[0026] In one embodiment, such as Figure 2 As shown, the bottom of the rotating disk 200 is provided with a first disk 21, and the first disk 21 is provided with a plurality of slots 211 for fixing the front end parts of dental products. The first disk 21 is provided with a second disk 22, and the second disk 22 is provided with a first gear platform 23. The first gear platform 23 is gear-shaped and is composed of a top edge 231 and a stop edge 232. The first gear platform 23 is provided with a central threaded hole 233 concentric with the first disk 21. By designing the slots 211 to be the same or different in shape and size, it can be adapted to different products.

[0027] In one embodiment, such as Figure 2 As shown, the rotating disk cover plate 300 has a first threaded post 301 on the side near the rotating disk 200. The rotating disk cover plate 300 and the first threaded post 301 have a fifth circular hole 302 and a sixth circular hole 303 for installing a locking tool on the opposite side. During assembly, the rotating disk 200 is installed in the first circular hole 101, the rotating disk cover plate 300 is installed in the second circular hole 102, and the first threaded post 301 is connected to the central threaded hole 233. The rotating disk cover plate 300 and the rotating disk 200 are fixedly connected by tightening with a locking tool.

[0028] In one embodiment, such as Figure 2 As shown, the pusher 400 includes a first cylinder 401, a second cylinder 402, and a third cylinder 403. The first cylinder 401, the second cylinder 402, and the third cylinder 403 are arranged axially along the handle 100. The second cylinder 402 is located between the first cylinder 401 and the third cylinder 403. One end of the spring 500 is sleeved on the outside of the third cylinder 403. The first cylinder 401 is in contact with the rotating disk 200, and the second cylinder 402 serves to limit the movement of the spring 500.

[0029] In one embodiment, such as Figure 2 As shown, the spring top plate 600 is a cylindrical structure. The spring top plate 600 is provided with a through mounting hole 601 for mounting the pin 700. During assembly, the spring top plate 600 is placed at one end of the spring 500.

[0030] In one embodiment, such as Figure 2 As shown, the adjusting knob 800 is a hollow cylindrical structure. The inner side of the adjusting knob 800 is provided with a second threaded hole 801, and an annular limiting block 802 is provided on one side of the second threaded hole 801. During assembly, the adjusting knob 800 is installed on the end of the handle 100 near the external thread 107 through the second threaded hole 801. During use, by rotating the adjusting knob 800, the adjusting knob 800 moves axially along the elongated hole 106 along the pin 700 and the spring top plate 600, thereby compressing and releasing the spring 500 to adjust the torque of the wrench.

[0031] In one embodiment, such as Figure 2 As shown, the retaining ring 900 has a second threaded post 901 on the side near the adjusting knob 800. The retaining ring 900 and the second threaded post 901 have a seventh round hole 902 and an eighth round hole 903 for installing a locking tool on the opposite side. During assembly, the retaining ring 900 is fixed to one end of the handle 100 by threading the second threaded post 901 to the first threaded hole 105, thereby limiting the displacement of the adjusting knob 800.

[0032] like Figure 4 As shown, let the required locking torque of the product be T1, and the torque generated on the rotating disk 200 be T2. Then, T1 = T2. When the torque-limiting wrench is in equilibrium, the force arm of the top edge 231 of the rotating disk 200 on the push pin 400 is r. 1，When the torque limiter reaches its maximum force, the lever arm increases from r1 to r2. During this process, the compression stroke of spring 500 is X1. Using the spring force formula F = k·X and the torque formula T = F·r, we get T1 = T2 = k·X1·r2, where X1 and r2 are known values ​​for the design. k is the spring constant of spring 500, which is related to the spring diameter and material. By selecting a suitable spring diameter and material, the required k value can be obtained, thus achieving the designed torque. When the lever arm is selected as r1, T3 = k·X1·r1, where T3 represents the initial rotational torque. When T3 < T2, rotating the adjusting knob 800 clockwise pushes the pin 700 and the spring top plate 600 forward, further compressing the spring. The thread pitch of the adjusting knob 800 is P. The spring compression stroke is P for each rotation of the adjusting knob 800. From F = k·X, we get F = k·P. The wrench torque T adjustment = k·X1·r2 + k·P·r2. Therefore, rotating the adjusting knob 800 clockwise can increase the wrench torque, and conversely, it can decrease the torque, thus achieving the function of adjustable torque.

[0033] The above embodiment discloses a torque-limiting wrench. When a product needs to be tightened, the left hand holds the product, clamping the detachable front end of the product with the slot 211 of the rotating disk 200, and the right hand holds the handle 100 of the torque-limiting wrench, rotating it clockwise. If the torque feedback from the front end of the product is small, the first cylinder 401 on the push pin 400 and the top edge 231 of the rotating disk 200 maintain plane-to-plane contact. As the torque increases, the first cylinder 401 on the push pin 400 and the top edge 231 of the rotating disk 200 maintain plane-to-plane contact. The top edge 231 maintains point-to-surface contact, and the spring 500 begins its compression stroke to store energy. When it approaches the set value of the torque limiter, it maintains contact between the plane of the first cylinder 401 on the push pin 400 and the arc surface connecting the top edge 231 and the stop edge 232. The spring 500's compression stroke is greater. At this time, when the torque feedback from the front end of the product increases further, the arc surface connecting the top edge 231 and the stop edge 232 will cross the plane of the first cylinder 401 on the push pin 400, and the spring 500 begins to extend and release energy, causing the push pin 400 to... The first cylinder 401 on the plane of the rotating disk 200 falls back to the next top edge 231 of the rotating disk 200, achieving the purpose of limiting force. The threaded connection between the second threaded hole 801 of the adjusting knob 800 and the external thread 107 of the handle 100, when the adjusting knob 800 is rotated clockwise, pushes the pin 700 and the spring top plate 600 forward, causing the spring 500 to be pre-compressed and stored energy. This increases the pushing force from the first cylinder 401 on the pusher pin 400 on the top edge 231 of the rotating disk 200. This achieves the purpose of adjusting the torque. When a product needs to be disassembled, hold the product with your left hand and clamp the front end of the detachable product with the slot 211 of the rotating disk 200. Hold the handle 100 of the torque limiter with your right hand and rotate it counterclockwise. The first cylinder 401 on the pusher 400 contacts the stop edge 232 of the rotating disk 200, causing the rotating disk 200 and the handle 100 to rotate together. The torque generated by holding the handle 100 of the torque limiter with your right hand is all applied to the product until the product is loosened.

[0034] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A force-limiting wrench, characterized in that, It is composed of a handle (100), a rotating disk (200), a rotating disk cover plate (300), a pusher pin (400), a spring (500), a spring top plate (600), a pin (700), an adjusting knob (800), and a fixing ring (900). The rotating disk (200) and the rotating disk cover plate (300) are located at one end of the handle (100), and the adjusting knob (800) is located at the other end of the handle (100). The pusher pin (400), the spring (500), the spring top plate (600), and the pin (700) are all located inside the handle (100). The spring (500) is sleeved on one end of the pusher pin (400), and the spring top plate (600) is located at the end of the spring (500) away from the pusher pin (400). The fixing ring (900) is located at one end of the adjusting knob (800).

2. The force-limiting wrench according to claim 1, characterized in that, The handle (100) has a first circular hole (101) and a second circular hole (102) at one end, and a third circular hole (103) along the axial direction of the handle (100) is provided on one side of the first circular hole (101). A fourth circular hole (104) is provided at one end of the third circular hole (103). A first threaded hole (105) is provided at the end of the fourth circular hole (104) away from the third circular hole (103). An external thread (107) is provided on the outside of the first threaded hole (105) and is concentric with it. A first cylindrical surface (108) is provided at one end of the external thread (107). Numbers and scales are engraved on the first cylindrical surface (108). An elongated hole (106) penetrating the fourth circular hole (104) and the first cylindrical surface (108) is provided on the side of the first cylindrical surface (108).

3. A force-limiting wrench according to claim 1, characterized in that, The rotating disk (200) has a first disk (21) at its bottom. The first disk (21) has a plurality of slots (211) for fixing the front end parts of dental products. The first disk (21) has a second disk (22). The second disk (22) has a first gear platform (23). The first gear platform (23) is gear-shaped and consists of a top edge (231) and a stop edge (232). The first gear platform (23) has a central threaded hole (233) concentric with the first disk (21).

4. A force-limiting wrench according to claim 1, characterized in that, The rotating disk cover plate (300) has a first threaded post (301) on the side of the rotating disk (200), and the rotating disk cover plate (300) opposite to the first threaded post (301) has a fifth round hole (302) and a sixth round hole (303) for installing locking tools.

5. A force-limiting wrench according to claim 1, characterized in that, The pusher (400) includes a first cylinder (401), a second cylinder (402) and a third cylinder (403). The first cylinder (401), the second cylinder (402) and the third cylinder (403) are arranged axially along the handle (100). The second cylinder (402) is located between the first cylinder (401) and the third cylinder (403). One end of the spring (500) is sleeved on the outside of the third cylinder (403).

6. A force-limiting wrench according to claim 1, characterized in that, The spring top plate (600) is a cylindrical structure, and the spring top plate (600) is provided with a through mounting hole (601) for mounting the pin (700).

7. A force-limiting wrench according to claim 1, characterized in that, The adjustment knob (800) is a hollow cylindrical structure. The inner side of the adjustment knob (800) is provided with a second threaded hole (801), and a ring-shaped limiting block (802) is provided on one side of the second threaded hole (801).

8. A force-limiting wrench according to claim 1, characterized in that, The fixing ring (900) has a second threaded post (901) on the side near the adjusting knob (800), and the fixing ring (900) and the second threaded post (901) have a seventh round hole (902) and an eighth round hole (903) for installing locking tools on the opposite side.

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