A type of force-limiting wrench

Abstract

This utility model discloses a torque-limiting wrench, including a grip handle and an actuating disc. The grip handle has a movable cavity, and the movable cavity has a reset assembly. The reset assembly includes a connecting spring and a movable push rod. One end of the connecting spring is mounted on the movable push rod, and the other end of the connecting spring is mounted on the bottom of the movable cavity. A plurality of actuating grooves are evenly distributed circumferentially around the center of the actuating disc. The actuating disc is mounted on the grip handle via a connecting assembly. The connecting assembly includes a connecting support, a rotating connecting rod, and a rotating connecting head. The connecting support is connected to the grip handle, the rotating connecting rod is mounted on the connecting support, and the rotating connecting head is mounted on the rotating connecting rod. This design ensures that the torque applied to the working tip of the device is within a safe range, preventing damage to the device or affecting the fixing effect due to excessive or insufficient torque.

Description

Technical Field

[0001] This utility model relates to a force-limiting wrench, belonging to the technical field of dental instruments and equipment. Background Technology

[0002] In dental treatment, various manual tools are often used to install the working tip of the device onto the device body. However, traditional wrenches often require the operator to rely on experience to judge whether the applied torque is appropriate. This can lead to applying too much torque and damaging the device, or applying too little torque and failing to achieve the desired fixation effect. A search revealed that Chinese patent CN219726020U discloses a dental working tip torque-limiting wrench. In this patent, the working tip is placed on a selected opening in the chuck, and the dentist grasps the handle and begins to rotate. Friction causes the shaft and chuck to rotate together, thereby tightening or loosening the working tip. As the torque increases, the dentist will feel increased resistance and stop applying torque. However, this patent's torque control relies entirely on the operator's subjective perception and lacks a protective mechanism. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a torque-limiting wrench that can ensure that the torque applied to the working tip of the equipment is within a safe range, and prevent damage to the equipment or affect the fixing effect due to excessive or insufficient torque.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a force-limiting wrench, comprising:

[0005] A grip handle is provided in the grip handle, and a reset component is provided in the movable cavity. The reset component includes a connecting spring and a movable push rod. One end of the connecting spring is installed on the movable push rod, and the other end of the connecting spring is installed at the bottom of the movable cavity.

[0006] A lever disc, with its center as the center, has multiple lever grooves evenly distributed circumferentially on the lever disc, and the lever disc is mounted on the grip handle via a connecting assembly;

[0007] The connecting assembly includes a connecting support, a rotating connecting rod, and a rotating connecting head. The connecting support is connected to the grip handle, the rotating connecting rod is mounted on the connecting support, and the rotating connecting head is mounted on the rotating connecting rod. The lever is adapted to apply external force to drive the rotating connecting head to rotate.

[0008] With the center of the rotary connector as the center, multiple arc concave surfaces are evenly arranged circumferentially on the outer wall surface of the rotary connector. A force-limiting groove is provided in the arc concave surface, and a locking protrusion adapted to the force-limiting groove is provided on the top of the movable push rod.

[0009] When not in use, the engaging protrusion is in the force-limiting groove. When the torque applied by the lever exceeds a preset threshold, the movable push rod is squeezed by the rotating connector and compresses the connecting spring, causing the engaging protrusion to disengage from the force-limiting groove and move along the arc concave surface until the engaging protrusion slides into the adjacent force-limiting groove. The connecting spring then pushes the movable push rod to reset, thus completing a single torque release.

[0010] Furthermore, the actuating groove is an open U-shaped groove.

[0011] Furthermore, to facilitate the replacement of the lever plate, the lever plate is mounted on the rotating connecting rod by at least one fastener.

[0012] Furthermore, the handle is also provided with a tail cap, and the tail cap has a mounting groove in the circumferential direction, with one end of the connecting spring disposed in the mounting groove.

[0013] Furthermore, in order to make the engagement protrusions transition smoothly between the arc concave surfaces, transition ribs are provided between two adjacent arc concave surfaces.

[0014] Furthermore, one end of the grip handle is provided with a mounting through hole, which is connected to the movable cavity;

[0015] When the grip handle is installed in place, the rotating connector passes through the mounting through hole.

[0016] Furthermore, in order to more directly observe the torque status, the top of the rotary connector is provided with multiple marking posts, each marking post corresponding to a transition rib, and the marking posts are vertically fixed to the top end face of the corresponding transition rib.

[0017] A rotating support rod is mounted on the grip handle via a connecting bracket. The rotating support rod is adapted to rotate around the axis of the connecting bracket at a certain angle, and the rotating support rod is adapted to rotate into position to block the marker post.

[0018] After adopting the above technical solution, this utility model has the following beneficial effects:

[0019] 1. In this utility model, the engaging protrusion is embedded in the force-limiting groove of the rotary connector. At this time, the connecting spring is in a naturally extended state, and the operator uses a force-limiting wrench. An external tool is inserted into the wrench slot and force is applied, causing the wrench disc to rotate. The torque is transmitted to the rotary connector through the rotary connecting rod.

[0020] If the torque does not exceed the threshold, the locking protrusion remains engaged, and the wrench normally transmits torque to the working tip of the equipment.

[0021] If the torque exceeds the threshold, the rotary connector squeezes the locking protrusion, the movable push rod moves backward under pressure, compressing the connecting spring. Under continuous force, the locking protrusion slides along the arc concave surface, disengages from the current force limiting groove, the rotary connector spins freely for a moment, the torque is interrupted, and after the locking protrusion slides into the adjacent force limiting groove, the connecting spring rebounds, pushes the movable push rod to reset, and relocks the rotary connector.

[0022] Torque control is achieved by utilizing the dynamic interaction between spring force and locking structure to prevent equipment overload.

[0023] 2. In the utility model, the rotating support rod can be rotated to be positioned above the rotating connector. The marking post rotates with the rotating connector. By observing its relative position with the rotating support rod, the current state of the torque can be intuitively determined.

[0024] The transition rib design ensures a smooth transition between the engagement protrusion and the concave surface, reducing wear and improving operational stability. Different sizes of lever discs can be quickly replaced using fasteners to adapt to various torque requirements. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a force-limiting wrench according to the present invention. Figure 1 ;

[0026] Figure 2 This is a schematic diagram of the structure of a force-limiting wrench according to the present invention. Figure 2 ;

[0027] Figure 3 This is a front view of a force-limiting wrench according to the present invention;

[0028] Figure 4 This is a top view of a force-limiting wrench according to the present invention;

[0029] Figure 5 This is a full sectional view of a force-limiting wrench according to the present invention. Detailed Implementation

[0030] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0031] like Figure 1-5 As shown, a torque-limiting wrench includes:

[0032] The grip handle 1 has a movable cavity 11 and a reset assembly. The reset assembly includes a connecting spring 21 and a movable push rod 22. One end of the connecting spring 21 is installed on the movable push rod 22, and the other end of the connecting spring 21 is installed at the bottom of the movable cavity 11.

[0033] The lever 3 has multiple lever grooves 31 evenly arranged around its center. The lever 3 is mounted on the grip handle 1 via a connecting component.

[0034] The connecting assembly includes a connecting support 41, a rotating connecting rod 42, and a rotating connector 43. The connecting support 41 is connected to the grip handle 1. The rotating connecting rod 42 is mounted on the connecting support 41. The rotating connector 43 is mounted on the rotating connecting rod 42. The lever 3 is adapted to apply external force to drive the rotating connector 43 to rotate.

[0035] With the center of the rotary connector 43 as the center, a plurality of arc concave surfaces 431 are evenly provided on the outer wall surface of the rotary connector 43. A force-limiting groove 432 is provided in the arc concave surface 431. The top of the movable push rod 22 is provided with a locking protrusion 433 that matches the force-limiting groove 432.

[0036] When not in use, the engaging protrusion 433 is in the force-limiting groove 432. When the torque applied by the lever 3 exceeds the preset threshold, the movable push rod 22 is squeezed by the rotating connector 43 and compresses the connecting spring 21, causing the engaging protrusion 433 to disengage from the force-limiting groove 432 and move along the arc concave surface 431 until the engaging protrusion 433 slides into the adjacent force-limiting groove 432. The connecting spring 21 pushes the movable push rod 22 to reset to complete the single torque release.

[0037] Specifically, such as Figure 1-2 As shown, the lever groove 31 is an open U-shaped groove.

[0038] Specifically, such as Figure 3-5 As shown, the lever 3 is mounted on the rotating connecting rod 42 by at least one fastener 5. In this embodiment, the lever 3 can be replaced by removing the fastener 5 in order to operate tools of different sizes.

[0039] Specifically, such as Figure 2 As shown, the handle 1 is also provided with a tail cover 12 at the end. The tail cover 12 is provided with a mounting groove 121 in the circumferential direction, and one end of the connecting spring 21 is provided in the mounting groove 121.

[0040] Specifically, such as Figure 2 As shown, a transition rib 434 is provided between two adjacent concave arc surfaces 431.

[0041] The design of the transition rib 434 ensures that the engagement protrusion 433 smoothly transitions between the arc concave surface 431, reducing wear and improving the stability of the action. Different sizes of lever disc 3 can be quickly replaced through the fastener 5 to adapt to various torque requirements.

[0042] Specifically, such as Figure 5 As shown, one end of the grip handle 1 is provided with a mounting through hole 13, which is connected to the movable cavity 11;

[0043] When the handle 1 is in place, rotate the connector 43 through the mounting hole 13.

[0044] Specifically, such as Figure 1-5 As shown, the top of the rotary connector 43 is provided with multiple marker posts 61, and the marker posts 61 are arranged one-to-one with the transition ribs 434, and the marker posts 61 are vertically fixed to the top end face of the corresponding transition ribs 434.

[0045] A rotating support rod 63 is mounted on the handle 1 via a connecting bracket 62. The rotating support rod 63 is adapted to rotate around the axis of the connecting bracket 62 at a certain angle, and the rotating support rod 63 is adapted to rotate into position to block the marker post 61.

[0046] The rotating support rod 63 can be rotated to be positioned above the rotating connector 43. The marking post 61 rotates with the rotating connector 43. By observing its relative position with the rotating support rod 63, the current state of the torque can be intuitively determined.

[0047] In this embodiment, the engaging protrusion 433 is embedded in the force-limiting groove 432 of the rotary connector 43. At this time, the connecting spring 21 is in a naturally extended state, and the operator uses a force-limiting wrench. An external tool is inserted into the lever groove 31 and force is applied, which drives the lever disc 3 to rotate. The torque is transmitted to the rotary connector 43 through the rotary connecting rod 42.

[0048] If the torque does not exceed the threshold, the engagement protrusion 433 remains engaged, and the wrench normally transmits torque to the working tip of the equipment.

[0049] If the torque exceeds the threshold, the rotary connector 43 presses against the locking protrusion 433, the movable push rod 22 moves backward under pressure, compressing the connecting spring 21. Under continuous force, the locking protrusion 433 slides along the arc concave surface 431, disengaging from the current force-limiting groove 432. The rotary connector 43 spins freely for a moment, the torque is interrupted, and after the locking protrusion 433 slides into the adjacent force-limiting groove 432, the connecting spring 21 rebounds, pushing the movable push rod 22 to reset and relock the rotary connector 43.

[0050] Torque control is achieved by utilizing the dynamic interaction between spring force and locking structure to prevent equipment overload.

[0051] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A force limiting wrench characterized by, include: A grip handle (1) is provided in which a movable cavity (11) is provided in which a reset assembly is provided. The reset assembly includes a connecting spring (21) and a movable push rod (22). One end of the connecting spring (21) is installed on the movable push rod (22), and the other end of the connecting spring (21) is installed at the bottom of the movable cavity (11). The lever (3) has multiple lever grooves (31) evenly arranged around its center. The lever (3) is mounted on the grip handle (1) via a connecting component. The connecting assembly includes a connecting support (41), a rotating connecting rod (42), and a rotating connector (43). The connecting support (41) is connected to the grip handle (1). The rotating connecting rod (42) is mounted on the connecting support (41). The rotating connector (43) is mounted on the rotating connecting rod (42). The lever (3) is adapted to apply external force to drive the rotating connector (43) to rotate. With the center of the rotary connector (43) as the center, a plurality of arc concave surfaces (431) are evenly provided on the outer wall surface of the rotary connector (43). A force-limiting groove (432) is provided in the arc concave surface (431). A locking protrusion (433) that matches the force-limiting groove (432) is provided on the top of the movable push rod (22). When not in use, the engaging protrusion (433) is in the force-limiting groove (432). When the torque applied by the lever (3) exceeds the preset threshold, the movable push rod (22) is squeezed by the rotating connector (43) and compresses the connecting spring (21), causing the engaging protrusion (433) to disengage from the force-limiting groove (432) and move along the arc concave surface (431) until the engaging protrusion (433) slides into the adjacent force-limiting groove (432). The connecting spring (21) pushes the movable push rod (22) to reset to complete a single torque release.

2. A force-limiting wrench according to claim 1, characterized in that: The lever groove (31) is an open U-shaped groove.

3. A force-limiting wrench according to claim 1, characterized in that: The lever (3) is mounted on the rotating connecting rod (42) by at least one fastener (5).

4. A force-limiting wrench according to claim 1, characterized in that: The handle (1) is also provided with a tail cap (12) at the end. The tail cap (12) is provided with a mounting groove (121) in the circumferential direction. One end of the connecting spring (21) is disposed in the mounting groove (121).

5. A force-limiting wrench according to claim 1, characterized in that: A transition rib (434) is provided between two adjacent concave arc surfaces (431).

6. A force-limiting wrench according to claim 5, characterized in that: One end of the grip handle (1) is provided with a mounting through hole (13), which is connected to the movable cavity (11); When the grip handle (1) is installed in place, the rotating connector (43) passes through the mounting through hole (13).

7. A force-limiting wrench according to claim 6, characterized in that: The top of the rotary connector (43) is provided with multiple marker posts (61), and the marker posts (61) are corresponding to the transition ribs (434) one by one. The marker posts (61) are vertically fixed to the top end face of the corresponding transition ribs (434). A rotating support rod (63) is mounted on the grip handle (1) via a connecting bracket (62). The rotating support rod (63) is adapted to rotate around the axis of the connecting bracket (62) at a certain angle. The rotating support rod (63) is adapted to rotate into position to block the marker post (61).

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