Dental force limiting wrench

Abstract

The utility model discloses a dental force-limiting wrench, which relates to the technical field of dental medical instruments and comprises a chuck, and the middle of the chuck is fixedly connected with a rotating shaft. The end, away from the chuck, of the rotating shaft is rotationally connected with the end of the sleeve. The chuck is uniformly provided with a plurality of openings, and the plurality of openings are annularly distributed; a polygonal through groove is formed in the middle of the chuck; the rotating shaft is fixedly connected with the chuck through the polygonal through groove of the chuck; the opening of the chuck can clamp the flat position of the work tip, and the multiple openings of the chuck can clamp the work tips of different types, so that the work tips of different types can be installed through the force-limiting wrench, cost is reduced, and the situation that the force-limiting wrench is wrongly selected due to the fact that the number of the force-limiting wrench is too large is prevented. The chuck and the rotating shaft are fixedly connected through the polygonal through groove in the middle of the chuck, relative rotation of the chuck and the rotating shaft can be effectively prevented, it is ensured that the rotating shaft can normally drive the chuck to rotate, and the chuck cannot rotate.

Description

Technical Field

[0001] The utility model relates to the technical field of dental medical devices, in particular to a dental torque-limiting wrench. Background Technique

[0002] In dental treatment, working tips such as ultrasonic osteotomes, ultrasonic scaler, and ultrasonic irrigators are often needed. These working tips need to be screwed onto the handle through threaded connections before they can be normally used by medical staff. As precision instruments, the force applied during the installation of working tips such as ultrasonic osteotomes, ultrasonic scaler, and ultrasonic irrigators needs to be controlled precisely. Excessive torque is likely to damage the working tip or the handle, and it will also affect its own power, resulting in poor treatment effects. Too little torque will cause the working tip to fall off.

[0003] Due to the high installation requirements of the working tip, a special torque-limiting wrench is needed for installation. The existing torque-limiting wrenches generally can only be applicable to working tips of one flat position specification, and the magnitude of the force cannot be adjusted. However, the types of working tips such as ultrasonic osteotomes, ultrasonic scaler, and ultrasonic irrigators are different, and their flat position specifications are also different. The flat position specifications of working tips of different specifications and different brands are also different. The existing torque-limiting wrenches cannot meet the installation needs of different working tips. For this reason, multiple torque-limiting wrenches need to be equipped, which increases the cost. In addition, the existing torque-limiting wrenches cannot adjust the force, and also cannot meet the installation needs of different types of working tips, and it is easy to cause damage to the working tip or the handle. Content of the Utility Model

[0004] The purpose of the utility model is to provide a dental torque-limiting wrench, which can have openings of multiple specifications and can simultaneously adapt to the tightening and loosening of working tips with different flat positions. At the same time, the force value of the torque-limiting wrench can be adjusted, so it is convenient to tighten and loosen working tips with different force requirements, so as to solve the technical problems put forward in the above background technique.

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

[0006] A dental torque-limiting wrench includes a chuck, and the middle of the chuck is fixedly connected with a rotating shaft; one end of the rotating shaft away from the chuck is rotatably connected with the end of a sleeve;

[0007] A plurality of arc-shaped grooves are evenly arranged on the surface of one end of the rotating shaft away from the chuck, and all the arc-shaped grooves are located inside the sleeve; a spring is arranged inside the sleeve, and a push rod and a force-limiting screw are respectively arranged at both ends of the spring; the force-limiting screw is located at one end of the sleeve away from the rotating shaft and is threadedly connected with the inner side of the sleeve; the push rod is located between the spring and the rotating shaft.

[0008] As a further technical solution of the utility model, the chuck is evenly provided with a plurality of openings, and the plurality of openings are distributed in a ring shape; a polygonal through groove is provided in the middle of the chuck, and the rotating shaft is fixedly connected to the chuck through the polygonal through groove of the chuck.

[0009] As a further technical solution of the utility model, the end of the rotating shaft close to the chuck is sleeved with gasket 1 and gasket 2, wherein gasket 1 is located on the inner side of the sleeve and gasket 2 is located on the inner side of the sleeve; gasket 1 and gasket 2 are both in circular shape.

[0010] As a further technical solution of the utility model, the end of the sleeve away from the chuck is cylindrical, and the outer side of the end close to the chuck is provided with a groove for the normal rotation of the chuck.

[0011] As a further technical solution of the utility model, the push rod includes a center column, which is cylindrical and coaxially arranged with the sleeve; the diameter of the center column is the same as the inner diameter of the sleeve.

[0012] As a further technical solution of the utility model, a top column is provided at one end of the center column close to the rotating shaft, and the end of the top column away from the center column is hemispherical, and the end of the top column away from the center column is in contact with the arc groove.

[0013] As a further technical solution of the utility model, a limiting column is provided at one end of the center column away from the top column, and the center column, the top column and the limiting column are coaxially arranged; the limiting column is located on the inner side of the spring; the diameter of the center column is larger than the diameter of the spring.

[0014] As a further technical solution of the utility model, the force limiting screw comprises a force limiting screw body, which is located inside the sleeve and is coaxially arranged with the sleeve.

[0015] As a further technical solution of the utility model, a second limiting column is provided at one end of the screw body close to the spring. The second limiting column is located on the inner side of the spring, and the diameter of the screw body is greater than the diameter of the spring.

[0016] As a further technical solution of the utility model, a plurality of slots are provided at one end of the screw body away from the spring.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. In the present invention, the chuck opening can clamp the flat part of the working tip, and the chuck is provided with a plurality of openings, which can clamp different types of working tips, so that different types of working tips can be installed by using the force limiting wrench, which not only reduces the cost but also prevents the situation of selecting the wrong force limiting wrench due to the excessive number of force limiting wrenches.

[0019] 2. In this utility model, the chuck and the rotating shaft are fixedly connected through a polygonal through groove in the middle of the chuck, which can effectively prevent relative rotation between the chuck and the rotating shaft, ensure that the rotating shaft can drive the chuck to rotate normally, and the chuck will not rotate by itself.

[0020] 3. In this utility model, the body of the force-limiting screw plays a role in supporting the spring, enabling the spring to normally press against the central column; the cooperation between the second limiting column and the first limiting column can prevent the spring from being overly bent, ensuring that the elastic force of the spring can be normally applied to the central column; under the action of the elastic force of the spring, the central column generates a force towards the arc-shaped groove, causing the ejector pin to wedge into the arc-shaped groove and always fit with the arc-shaped groove.

[0021] 4. In this utility model, during the process of tightening or loosening the working tip, the medical staff controls the rotation of the sleeve. Since the ejector pin wedges into the arc-shaped groove of the rotating shaft, the sleeve can drive the rotating shaft to rotate synchronously while rotating. When the rotating shaft rotates, it drives the chuck to rotate. During the rotation of the chuck, the working tip is tightened or loosened, achieving the effect of tightening or loosening the working tip; when the torque generated at the chuck and the working tip reaches a certain value, the arc-shaped groove overcomes the friction force of its arc surface and pushes the ejector pin towards the direction of the spring, enabling the rotating shaft and the chuck to rotate relative to the sleeve, generating an idling effect, which can effectively prevent damage to the working tip or the handle.

[0022] 5. In this utility model, the medical staff drives the body of the force-limiting screw to rotate through the slot, causing the body of the force-limiting screw to move in the sleeve, which can change the distance between the body of the force-limiting screw and the central column, thereby adjusting the compression degree of the spring, further changing the magnitude of the elastic force of the spring, and ultimately achieving the purpose of adjusting the squeezing force of the ejector pin on the arc-shaped groove and adjusting the force limit of the force-limiting wrench. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional structural schematic diagram of this utility model.

[0024] Figure 2 is another perspective view of this utility model Figure 1 from another angle.

[0025] Figure 3 is a top view of this utility model Figure 1 from a certain part.

[0026] Figure 4 is a sectional view taken along line A-A of this utility model Figure 3 from a certain part.

[0027] Figure 5 is an internal structural schematic diagram of this utility model Figure 1 from a certain part.

[0028] Figure 6 is a front view of this utility model Figure 5 from a certain part.

[0029] Figure 7 is a partial structural schematic diagram of the present utility model. Figure 1

[0030] Figure 8 is a side view of the present utility model. Figure 7

[0031] Figure 9 is a three-dimensional structural schematic diagram of the ejector rod of the present utility model.

[0032] Figure 10 is a three-dimensional structural schematic diagram of the force-limiting screw of the present utility model.

[0033] In the figure: 1 - sleeve, 2 - chuck, 3 - rotating shaft, 4 - force-limiting screw, 5 - spring, 6 - ejector rod, 7 - washer one, 8 - washer two, 9 - arc groove;

[0034] 41 - force-limiting screw body, 42 - slot, 43 - limiting post two, 61 - central post, 62 - ejector post, 63 - limiting post one. Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0036] Please refer to Figure 1-10 , in the embodiment of the present utility model, a dental force-limiting wrench includes a chuck 2, and the middle of the chuck 2 is fixedly connected to a rotating shaft 3; one end of the rotating shaft 3 away from the chuck 2 is rotatably connected to the end of a sleeve 1;

[0037] A plurality of arc grooves 9 are uniformly arranged on the surface of one end of the rotating shaft 3 away from the chuck 2, and the plurality of arc grooves 9 are all located inside the sleeve 1; a spring 5 is arranged inside the sleeve 1, and an ejector rod 6 and a force-limiting screw 4 are respectively arranged at both ends of the spring 5; the force-limiting screw 4 is located at one end of the sleeve 1 away from the rotating shaft 3 and is threadedly connected to the inner side of the sleeve 1; the ejector rod 6 is located between the spring 5 and the rotating shaft 3;

[0038] A plurality of openings are uniformly arranged on the chuck 2, and the plurality of openings are annularly distributed; a polygonal through groove is arranged in the middle of the chuck 2, and the rotating shaft 3 is fixedly connected to the chuck 2 through the polygonal through groove of the chuck 2.

[0039] ​​By adopting the above technical solution, the opening of the chuck 2 can clamp the flat position of the working tip, and the chuck 2 is provided with multiple openings, which can clamp different types of working tips, so that different types of working tips can be installed using the force limiting wrench, which not only reduces the cost but also prevents the situation where the wrong force limiting wrench is selected due to the excessive number of force limiting wrenches.

[0040] In this embodiment, the end of the rotating shaft 3 close to the chuck 2 is sleeved with a gasket 1 7 and a gasket 2 8, wherein the gasket 1 7 is located inside the sleeve 1, and the gasket 2 8 is located inside the sleeve 1; the gasket 1 7 and the gasket 2 8 are both in annular shape;

[0041] The end of the sleeve 1 away from the chuck 2 is cylindrical, and the outer side of the end close to the chuck 2 is provided with a groove for the chuck 2 to rotate normally.

[0042] By adopting the above technical solution, the chuck 2 and the rotating shaft 3 are fixedly connected through the polygonal through groove in the middle of the chuck 2, which can effectively prevent the chuck 2 and the rotating shaft 3 from rotating relative to each other, ensuring that the rotating shaft 3 can normally drive the chuck 2 to rotate without the chuck 2 rotating on its own.

[0043] In this embodiment, the push rod 6 includes a central column 61, which is cylindrical and coaxially arranged with the sleeve 1; the diameter of the central column 61 is the same as the inner diameter of the sleeve 1;

[0044] A top column 62 is provided at one end of the center column 61 close to the rotating shaft 3 . The end of the top column 62 away from the center column 61 is hemispherical, and the end of the top column 62 away from the center column 61 fits with the arc groove 9 .

[0045] By adopting the above technical solution, the force limiting screw body 41 plays the role of supporting the spring 5, so that the spring 5 can normally support the center column 61; the cooperation between the limit column 2 43 and the limit column 1 63 can prevent the spring 5 from excessive bending, and ensure that the elastic force of the spring 5 can be normally applied to the center column 61; under the action of the elastic force of the spring 5, the center column 61 generates a force in the direction of the arc groove 9, so that the top column 62 is wedged into the arc groove 9 and always fits with the arc groove 9.

[0046] In this embodiment, a limiting column 63 is provided at one end of the center column 61 away from the top column 62, and the center column 61, the top column 62 and the limiting column 63 are coaxially arranged; the limiting column 63 is located on the inner side of the spring 5; the diameter of the center column 61 is larger than the diameter of the spring 5;

[0047] The end of the center column 61 away from the top column 62 is provided with a limit column 63, and the center column 61, the top column 62 and the limit column 63 are coaxially arranged; the limit column 63 is located on the inner side of the spring 5; the diameter of the center column 61 is larger than the diameter of the spring 5;

[0048] The force limiting screw 4 comprises a force limiting screw body 41 . The force limiting screw body 41 is located inside the sleeve 1 and is coaxially arranged with the sleeve 1 .

[0049] By adopting the above technical solution, during the process of tightening or loosening the working tip, the medical staff controls the rotation of the sleeve 1. Because the push column 62 is wedged into the arc groove 9 of the rotating shaft 3, the sleeve 1 can synchronously drive the rotating shaft 3 to rotate while rotating. The rotating shaft 3 drives the chuck 2 to rotate while rotating. The chuck 2 twists the working tip during the rotation process, which can achieve the effect of tightening or loosening the working tip; when the torque generated at the chuck 2 and the working tip reaches a certain value, the arc groove 9 overcomes the friction force of its arc surface and pushes the push column 62 in the direction of the spring 5, so that the rotating shaft 3 and the chuck 2 can rotate relative to the sleeve, resulting in an idling effect, which can effectively prevent the working tip or the handle from being damaged.

[0050] In this embodiment, a second limiting column 43 is provided at one end of the screw body 41 close to the spring 5. The second limiting column 43 is located on the inner side of the spring 5. The diameter of the screw body 41 is greater than the diameter of the spring 5.

[0051] A plurality of slots 42 are disposed on one end of the screw body 41 away from the spring 5 .

[0052] By adopting the above technical solution, medical staff can drive the force limiting screw body 41 to rotate through the slot 42, allowing the force limiting screw body 41 to move in the sleeve 1, and can change the distance between the force limiting screw body 41 and the center column 61, thereby adjusting the compression degree of the spring 5, and then changing the elastic force of the spring 5, and finally achieving the purpose of adjusting the squeezing force of the top column 62 on the arc groove 9, thereby adjusting the force limiting size of the force limiting wrench.

[0053] The working principle of the utility model is that the opening of the chuck 2 can clamp the flat part of the working tip, and the chuck 2 is provided with a plurality of openings, which can clamp different types of working tips, so that different types of working tips can be installed by using the force-limiting wrench, which not only reduces the cost but also prevents the situation that the wrong force-limiting wrench is selected due to the excessive number of force-limiting wrenches.

[0054] The chuck 2 and the rotating shaft 3 are fixedly connected through the polygonal through groove in the middle of the chuck 2, which can effectively prevent the chuck 2 and the rotating shaft 3 from rotating relative to each other, ensuring that the rotating shaft 3 can normally drive the chuck 2 to rotate, and the chuck 2 will not rotate on its own;

[0055] The force-limiting screw body 41 plays a role in supporting the spring 5, so that the spring 5 can normally support the center column 61; the cooperation between the second limiting column 43 and the first limiting column 63 can prevent the spring 5 from being excessively bent, and ensure that the elastic force of the spring 5 can be normally applied to the center column 61; under the action of the elastic force of the spring 5, the center column 61 generates a force in the direction of the arc groove 9, so that the top column 62 is wedged into the arc groove 9 and always fits with the arc groove 9;

[0056] During the process of tightening or loosening the working tip, the medical staff controls the rotation of the sleeve 1. Since the ejector pin 62 is wedged into the arc-shaped groove 9 of the rotating shaft 3, the sleeve 1 can drive the rotating shaft 3 to rotate synchronously while rotating. While the rotating shaft 3 rotates, it drives the chuck 2 to rotate. During the rotation of the chuck 2, the working tip is screwed, and the effect of tightening or loosening the working tip can be achieved; when the torque generated between the chuck 2 and the working tip reaches a certain value, the arc-shaped groove 9 overcomes the friction force of its arc surface and pushes the ejector pin 62 towards the direction of the spring 5, so that the rotating shaft 3 and the chuck 2 can rotate relative to the sleeve, producing an idling effect, which can effectively prevent the working tip or the handle from being damaged;

[0057] The medical staff drives the limiting screw body 41 to rotate through the slot 42, and makes the limiting screw body 41 move in the sleeve 1, which can change the distance between the limiting screw body 41 and the central column 61, so as to adjust the compression degree of the spring 5, and then change the elastic force of the spring 5. Finally, the purpose of adjusting the extrusion force of the ejector pin 62 on the arc-shaped groove 9 is achieved, and the purpose of adjusting the limiting force of the limiting wrench is achieved.

[0058] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A dental torque-limiting wrench, characterized in that: It includes a chuck (2), the middle of which is fixedly connected to a rotating shaft (3); one end of the rotating shaft (3) far from the chuck (2) is rotatably connected to the end of a sleeve (1). On the surface of one end of the rotating shaft (3) far from the chuck (2), a plurality of arc-shaped grooves (9) are evenly arranged, and all the plurality of arc-shaped grooves (9) are located inside the sleeve (1); a spring (5) is arranged inside the sleeve (1), and a ejector rod (6) and a force-limiting screw (4) are respectively arranged at both ends of the spring (5); the force-limiting screw (4) is located at one end of the sleeve (1) far from the rotating shaft (3) and is threadedly connected to the inner side of the sleeve (1); the ejector rod (6) is located between the spring (5) and the rotating shaft (3).

2. The dental force-limiting wrench according to claim 1, wherein: On the chuck (2), a plurality of openings are evenly arranged, and the plurality of openings are annularly distributed; a polygonal through groove is arranged in the middle of the chuck (2), and the rotating shaft (3) is fixedly connected to the chuck (2) through the polygonal through groove of the chuck (2).

3. The dental force-limiting wrench according to claim 1, wherein: One end of the rotating shaft (3) close to the chuck (2) is sleeved with a first gasket (7) and a second gasket (8), wherein the first gasket (7) is located inside the sleeve (1), and the second gasket (8) is located inside the sleeve (1); both the first gasket (7) and the second gasket (8) are annular.

4. The dental force-limiting wrench according to claim 1, wherein: One end of the sleeve (1) far from the chuck (2) is cylindrical, and a groove for the normal rotation of the chuck (2) is arranged on the outer side of the end close to the chuck (2).

5. The dental force-limiting wrench according to claim 4, characterized in that: The ejector rod (6) includes a central column (61), which is cylindrical, and the central column (61) is coaxially arranged with the sleeve (1); the diameter of the central column (61) is the same as the inner diameter of the sleeve (1).

6. The dental force-limiting wrench according to claim 5, wherein: One end of the central column (61) close to the rotating shaft (3) is provided with a ejector post (62), the end of the ejector post (62) far from the central column (61) is hemispherical, and the end of the ejector post (62) close to and far from the central column (61) fits with the arc-shaped groove (9).

7. The dental torque-limiting wrench according to claim 6, wherein: One end of the central column (61) far from the ejector post (62) is provided with a first limiting post (63), and the central column (61), the ejector post (62) and the first limiting post (63) are coaxially arranged; the first limiting post (63) is located inside the spring (5); the diameter of the central column (61) is larger than the diameter of the spring (5).

8. The dental torque-limiting wrench according to claim 7, characterized in that: The force-limiting screw (4) includes a force-limiting screw body (41), which is located inside the sleeve (1) and is coaxially arranged with the sleeve (1).

9. The dental force-limiting wrench according to claim 8, wherein: One end of the screw body (41) close to the spring (5) is provided with a second limiting post (43), which is located inside the spring (5), and the diameter of the screw body (41) is larger than the diameter of the spring (5).

10. The dental force-limiting wrench according to claim 9, wherein: A plurality of slots (42) are arranged at one end of the screw body (41) far from the spring (5).

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