Torsion spring positioning device
By designing the pressing arm and pushing arm in the torsion spring positioning device, the problem of complicated torsion spring assembly is solved, an efficient and precise assembly process is achieved, and production efficiency and product quality are improved.
Patent Information
- Application Number
- CN202422656091.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-09-09
- Estimated Expiration
- 2034-10-31
AI Technical Summary
In the existing hinge assembly process, the assembly of the torsion spring is tedious and complicated, resulting in low production efficiency and product quality affected by manual labor.
A torsion spring positioning device is designed, which includes a placement piece, a pressing arm and a pushing arm. Through the cooperation of the pressing arm and the pushing arm, the first arm and the second arm of the torsion spring can be rotated to the corresponding installation position to achieve positioning and assembly.
The precision and working efficiency of torsion spring assembly are improved, damage to the arm caused by excessive force is avoided, the service life is extended, and the cost is reduced.
Smart Images
Figure CN223313839U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of hinge assembly equipment, and in particular relates to a torsion spring positioning device. Background Art
[0002] A hinge, also known as a hinge, is a mechanical device used to connect two solid bodies and allow relative rotation between them. The structure of the existing hinge includes an arm body, a torsion spring, a tail buckle and a buckle. During assembly, the arm body, torsion spring, tail buckle and buckle need to be assembled together with nails. Among them, the two ends of the torsion spring have a first arm and a second arm. The first arm needs to rest on the arm body, and the second arm needs to hang on the tail buckle to make the tail buckle have a certain elasticity. However, since the assembly of the torsion spring is relatively cumbersome and complicated, most of them still use manual twisting operations on the torsion spring, which not only leads to low production efficiency, but also the assembly of the product is subject to manual constraints, which greatly affects the quality of the product. Utility Model Content
[0003] The purpose of the utility model is to provide a torsion spring positioning device that can solve the above problems.
[0004] To achieve the above-mentioned purpose, the present invention provides a torsion spring positioning device, comprising:
[0005] A storage member, wherein the upper end of the storage member is provided with a groove adapted to the torsion spring, and the two ends of the torsion spring are respectively provided with a first arm and a second arm. When the torsion spring is placed in the groove, the first arm is inclined upward relative to the horizontal plane, and the second arm is arranged vertically;
[0006] a press arm, the press arm being disposed on one side of the placement member, a limiting portion corresponding to the torsion spring being disposed on a side of the press arm facing the placement member, the press arm being capable of horizontal linear movement in the direction of the torsion spring so that a space is formed between the limiting portion and the groove, and the torsion spring being capable of rotating in the space; and
[0007] A pushing arm is arranged on the side of the pressing arm corresponding to the first arm, and is tilted upward. The pushing arm can move upward along its tilted direction to push the first arm, so that the torsion spring rotates to make the second arm rest against the side wall of the groove corresponding to it, and twist the first arm to the installation position.
[0008] Optionally, it also includes:
[0009] a base, on which the storage element is detachably disposed, and an upper end of the storage element extends from an upper end of the base; and
[0010] A lifting plate capable of moving up and down, wherein the lifting plate has a first position, a second position, and a third position sequentially arranged from bottom to top;
[0011] When the lifting plate moves from the first position to the second position, it can drive the pressing arm and the pushing arm to move horizontally and linearly in the direction of the torsion spring;
[0012] When the lifting plate moves from the second position to the third position, it can drive the pushing arm to move upward along its inclined direction.
[0013] Optionally, a trigger member is further included, which is arranged below the base, a rolling member is provided at the lower end of the lifting plate, and an upward inclined slope is provided at the upper end of the trigger member. The rolling member can climb from the lower end of the slope to the upper end of the slope to drive the lifting plate to move upward from the first position to the second position and the third position.
[0014] Optionally, an elastic member is further included, which is connected to the base and the lifting plate. When the rolling member is disconnected from the ramp, the elastic member can drive the lifting plate to move from the third position to the first position via the second position.
[0015] Optionally, the elastic member is a return spring.
[0016] Optionally, the base is provided with movable openings running through the upper and lower ends thereof, the lifting plate is adapted to the movable openings, the upper end of the lifting plate is provided with an opening, the pressing arm is provided at the opening, the opening forms two connecting walls at the upper end of the lifting plate, the connecting walls are provided with a first guide hole and a second guide hole inclined in a direction away from the torsion spring, the first guide hole and the second guide hole have the same inclination angle, two first guide holes are provided at intervals along the movement direction of the pressing arm, and the second guide hole is located above the first guide hole;
[0017] The movable port is provided with a third guide hole on an inner wall corresponding to the first guide hole, the third guide hole being arranged along the movement direction of the press arm, the press arm is provided with a first connecting member corresponding to the first guide hole, both ends of the first connecting member respectively pass through the corresponding first guide hole and extend into the corresponding third guide hole;
[0018] A guide groove is provided on the side of the pressing arm facing the pushing arm, and the guide groove has the same inclination direction as the pushing arm. The pushing arm is arranged in the guide groove, and a first avoidance hole is provided on the inner bottom wall of the guide groove along its inclination direction. A second connecting piece is provided on the pushing arm, one end of which passes through the first avoidance hole, and both ends of the second connecting piece extend into the corresponding second guide holes respectively.
[0019] Optionally, a second avoidance hole is vertically arranged at the lower end of the first guide hole, and the lower end of the first guide hole is connected to the upper end of the second avoidance hole; a fourth guide hole is horizontally arranged at the lower end of the second guide hole, and the second guide hole is connected to the end of the fourth guide hole away from the torsion spring.
[0020] Optionally, a mounting hole is provided on the inner wall of the groove, and an adsorption member for adsorbing the torsion spring is provided at the mounting hole.
[0021] Optionally, the adsorption member is a magnet.
[0022] Optionally, the side of the pressing arm facing the torsion spring is provided with an inclined surface inclined away from the torsion spring, the limiting portion is provided on the inclined surface and close to the upper end of the inclined surface, and the limiting portion is an arc-shaped groove adapted to the outer wall of the torsion spring.
[0023] Compared with the prior art, the beneficial effects of the present invention are: through the cooperation of the pressing arm and the pushing arm, the first arm and the second arm can be rotated to the corresponding installation position for positioning, so as to facilitate the subsequent assembly of the torsion spring, and the force is evenly distributed, which can avoid the occurrence of situations such as the first arm and the second arm being damaged by excessive force, and can greatly improve the service life. The overall design is reasonable, the structure is simple and stable, the precision is high, the work efficiency is high, and the cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0025] Figure 1 It is a three-dimensional diagram of the present utility model.
[0026] Figure 2 This is an explosion diagram of the utility model.
[0027] Figure 3 This is a schematic structural diagram of the connection between the lifting plate, the pressing arm and the pushing arm in the utility model.
[0028] Figure 4 It is a structural schematic diagram of the lifting plate in the utility model.
[0029] Figure 5 This is a structural diagram of the object placed in the utility model.
[0030] In the picture:
[0031] 100, storage part; 110, groove; 111, suction part; 112, notch; 113, chamfer;
[0032] 200, press arm; 210, inclined surface; 211, limit portion; 220, first connecting member; 230, guide groove; 231, first avoidance hole;
[0033] 300, pusher arm; 310, second connecting member;
[0034] 400, base; 410, movable opening; 411, third guide hole;
[0035] 500, lifting plate; 510, rolling element; 520, opening; 530, connecting wall; 531, first guide hole; 532, second guide hole; 533, second avoidance hole; 534, fourth guide hole;
[0036] 600, trigger; 610, ramp;
[0037] 700, elastic parts;
[0038] 800, torsion spring; 810, first arm; 820, second arm. DETAILED DESCRIPTION
[0039] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the embodiments of the present invention, and should not be construed as limiting the present invention.
[0040] In the description of the embodiments of the present invention, it should be understood that if there are directional indications in the embodiments of the present invention, such as the orientation or position relationship of up, down, left, right, front, back, inside, and outside, which are based on the orientation or position relationship shown in the accompanying drawings, it is only for the convenience of describing the embodiments of the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.
[0042] In the embodiments of the present invention, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connected," and "fixed" should be understood broadly. For example, they may refer to fixed connections, removable connections, or integration. They may refer to mechanical connections or electrical connections. They may refer to direct connections or indirect connections through an intermediary. They may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in the embodiments of the present invention based on the specific circumstances.
[0043] like Figures 1 to 5 As shown, an embodiment of the present invention provides a torsion spring positioning device, including a placement member 100 , a pressing arm 200 , a pushing arm 300 , a base 400 , a lifting plate 500 and a trigger member 600 .
[0044] In which, the upper end of the storage piece 100 is provided with a groove 110 adapted to the torsion spring 800, and the two ends of the torsion spring 800 are respectively provided with a first arm 810 and a second arm 820. When the torsion spring 800 is placed in the groove 110, the first arm 810 is inclined upward relative to the horizontal plane, and the second arm 820 is vertically arranged. Specifically, the groove 110 is U-shaped. It should be understood that the end of the second arm 820 away from the torsion spring 800 is bent along the axial direction of the torsion spring 800 and toward the direction of the first arm 810. A notch 112 is provided on the side wall of the groove 110 corresponding to the first arm 810, and the first arm 810 rests on the notch 112. The notch 112 is tilted upward to make the first arm 810 tilt upward, thereby limiting the initial state of the torsion spring 800 and ensuring the accuracy of assembly.
[0045] Furthermore, a mounting hole (not shown in the figure) is opened on the inner wall of the groove 110, and an adsorption part 111 for adsorbing the torsion spring 800 is provided at the mounting hole. Specifically, the adsorption part 111 is preferably a magnet. During operation, the torsion spring 800 is placed flat on the groove 110 by a robot, and the adsorption part 111 will adsorb the torsion spring 800 to prevent the torsion spring 800 from deflecting, thereby improving the stability of the torsion spring 800 and improving the efficiency of subsequent assembly.
[0046] Furthermore, the pressing arm 200 is arranged on one side of the storage part 100, and a limiting portion 211 corresponding to the torsion spring 800 is provided on the side of the pressing arm 200 facing the storage part 100. The pressing arm 200 can move horizontally in a straight line in the direction of the torsion spring 800 so that the limiting portion 211 and the groove 110 form a space, and the torsion spring 800 can rotate in the space to position the torsion spring 800 to prevent it from jumping or the like.
[0047] Furthermore, the push arm 300 is arranged on the side of the pressing arm 200 corresponding to the first arm 810, and is tilted upward. When the torsion spring 800 is restricted, the push arm 300 can move upward along its tilt direction to push the first arm 810, so that the torsion spring 800 rotates to make the second arm 820 abut against the side wall corresponding to the groove 110 and the first arm 810, and twist the first arm 810 to the installation position. Specifically, when the second arm 820 abuts against the side wall corresponding to the groove 110 and the second arm 820, the curved portion on it just hangs Leaning on the tail buckle, further, the first arm 810 is twisted to the installation position connected to the arm body of the hinge, that is, through the cooperation of the pressing arm 200 and the pushing arm 300, the first arm 810 and the second arm 820 can be rotated to the corresponding installation position for positioning, so as to facilitate the subsequent assembly of the torsion spring 800, and the force is evenly distributed, which can avoid the first arm 810 and the second arm 820 from being damaged by excessive force, and can greatly improve the service life. The overall design is reasonable, the structure is simple and stable, the precision is high, the work efficiency is high, and the cost can be reduced.
[0048] In one embodiment, the storage member 100 is detachably mounted on the base 400, and the upper end of the storage member 100 extends from the upper end of the base 400. Specifically, the storage member 100 is fixed to the base 400 via a latch. Different types of storage members 100, i.e., grooves 110 of different sizes, can be replaced to accommodate torsion springs 800 of different sizes. It should be understood that the base 400 is fixed to a turntable (not shown) and rotates with the turntable to process various parts of the hinges.
[0049] Furthermore, the lifting plate 500 can move up and down, and its movement has a first position, a second position and a third position arranged in sequence from bottom to top.
[0050] Specifically, when the lifting plate 500 moves from the first position to the second position, it can drive the pressing arm 200 and the pushing arm 300 to move horizontally in the direction of the torsion spring 800, so that the limiting part 211 limits the torsion spring 800, so that the pushing arm 300 is close to the first arm 810, so as to reduce the stroke of the pushing arm 300. Furthermore, when the lifting plate 500 moves from the second position to the third position, it can drive the pushing arm 300 to move upward along its inclined direction to twist the first arm 810, and the structure is compact and stable.
[0051] In some specific embodiments, the base 400 is provided with movable openings 410 running through the upper and lower ends thereof, and the lifting plate 500 is adapted to the movable openings 410 to ensure the stability of the lifting plate 500 in moving up and down.
[0052] Furthermore, an opening 520 is provided at the upper end of the lifting plate 500, and the pressing arm 200 is provided at the opening 520. It should be noted that the opening 520 is hollowed out on both side walls facing the torsion spring 800 and away from the torsion spring 800 to facilitate the movement of the pressing arm 200.
[0053] Furthermore, the opening 520 forms two connecting walls 530 at the upper end of the lifting plate 500, and the connecting wall 530 is provided with a first guide hole 531 and a second guide hole 532 inclined in the direction away from the torsion spring 800, wherein the inclination angles of the first guide hole 531 and the second guide hole 532 are the same, and two first guide holes 531 are arranged at intervals along the movement direction of the pressing arm 200, and the second guide hole 532 is located above the first guide hole 531.
[0054] Furthermore, the movable opening 410 is provided with a third guide hole 411 on the inner wall corresponding to the first guide hole 531, wherein the third guide hole 411 is provided along the movement direction of the pressing arm 200, that is, it is arranged horizontally, and the pressing arm 200 is provided with a first connecting member 220 corresponding to the first guide hole 531, that is, there are two first connecting members 220, and the two first connecting members 220 can support the pressing arm 200 to prevent it from rotating. Further, the two ends of the first connecting member 220 respectively pass through the corresponding first guide holes 531 and extend into the corresponding third guide holes 411. The function of the guide hole 411 is to guide the first connecting member 220 so that it moves linearly along the horizontal plane. When the lifting plate 500 moves from the first position to the second position, the first guide hole 531 will squeeze the first connecting member 220 and push the first connecting member 220 to move in the direction of the torsion spring 800. It should be noted that the distance between the two first connecting members 220 is less than the length of the third guide hole 411. When the lifting plate 500 moves to the second position, the end of the third guide hole 411 close to the torsion spring 800 abuts against the first connecting member 220 close to the torsion spring 800 to limit the position and improve stability.
[0055] Furthermore, a guide groove 230 is provided on the side of the pressing arm 200 facing the pushing arm 300, and the guide groove 230 has the same inclination direction as the pushing arm 300. The pushing arm 300 is arranged in the guide groove 230 to ensure the stability of the pushing arm 300 and save space. Furthermore, a first avoidance hole 231 is provided on the inner bottom wall of the guide groove 230 along its inclination direction, and a second connecting member 310 with one end passing through the first avoidance hole 231 is provided on the pushing arm 300. The first avoidance hole 231 plays the role of avoiding and limiting the second connection. Furthermore, the two ends of the second connecting member 310 respectively extend into the corresponding second guide holes 532. When the first guide hole 531 squeezes the first connecting member 220, the second guide hole 532 synchronously squeezes the second connecting member 310, so that the second connecting member 310 moves synchronously in the direction of the torsion spring 800, which has the advantages of simple and stable structure, convenient production and processing, and low production cost.
[0056] It should be noted that the first connecting member 220 and the second connecting member 310 are preferably cylindrical pins, and the first guide hole 531 and the second guide hole 532 are adapted to the first connecting member 220 and the second connecting member 310 .
[0057] Furthermore, a second avoidance hole 533 is vertically provided at the lower end of the first guide hole 531, and the lower end of the first guide hole 531 is connected to the upper end of the second avoidance hole 533; a fourth guide hole 534 is horizontally provided at the lower end of the second guide hole 532, and the second guide hole 532 is connected to the end of the fourth guide hole 534 away from the torsion spring 800. The function of the second avoidance hole 533 is to limit and avoid the first connecting member 220 when the lifting plate 500 moves from the second position to the third position, so that when the pressing arm 200 limits the torsion spring 800, the lifting plate 500 can still move upward, and further drive the second connecting member 310 through the fourth guide hole 534, and drive the pushing arm 300 to move upward in an inclined direction to push the first arm 810 to twist to the installation position.
[0058] In one embodiment, the trigger member 600 is arranged below the base 400, wherein the lower end of the lifting plate 500 is provided with a rolling member 510, and the upper end of the trigger member 600 is provided with an upwardly inclined ramp 610, and the rolling member 510 can climb from the lower end of the ramp 610 to the upper end of the ramp 610 to drive the lifting plate 500 to move upward from the first position to the second position and the third position, that is, the rolling member 510 is squeezed by the ramp 610 to drive the lifting plate 500 to move upward. The structure is simple and the design is ingenious, which can reduce costs, facilitate maintenance and replacement, save energy, and adapt to use in different environments. It can accurately control the force of the pushing arm 300 to avoid damaging the force-bearing arm on the torsion spring 800 by excessive or insufficient force; specifically, the rolling member 510 is preferably a bearing, and the rolling member 510 can improve the smoothness of work and increase service life.
[0059] In one embodiment, the elastic member 700 is connected to the base 400 and the lifting plate 500. Specifically, the elastic member 700 is preferably a reset spring. More specifically, a step (not shown) is provided at the lower end of the lifting plate 500, and corresponding grooves are provided at the upper end of the step and the lower end of the base 400. The upper and lower ends of the elastic member 700 extend into the corresponding grooves respectively. When the rolling member 510 is disconnected from the ramp 610, the elastic member 700 can drive the lifting plate 500 to move from the third position to the second position to the first position, that is, reset the lifting plate 500, so as to facilitate the operation of subsequent processes. It has the advantages of simple and reliable structure, low cost, energy saving and environmental protection.
[0060] In one embodiment, the side of the pressing arm 200 facing the torsion spring 800 is provided with an inclined surface 210 inclined in a direction away from the torsion spring 800, and the limiting portion 211 is provided on the inclined surface 210 and close to the upper end of the inclined surface 210. The limiting portion 211 is an arc-shaped notch adapted to the outer wall of the torsion spring 800. It should be noted that the height of the side wall of the groove 110 close to the limiting portion 211 is lower than the side wall away from the limiting portion 211, so that the limiting portion 211 can be adjusted to the desired position. 1 is connected to the torsion spring 800, and the side wall of the groove 110 close to the limiting portion 211 is provided with a chamfer 113 that can fit with the inclined surface 210 for limiting. Furthermore, when the chamfer 113 fits with the inclined surface 210, the side wall of the groove 110 away from the limiting portion 211 and the upper end of the inclined surface 210 form an outlet (not shown) for the second arm 820 to extend. The width of the outlet is smaller than the diameter of the torsion spring 800 to prevent the torsion spring 800 from falling off.
[0061] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A torsion spring positioning device, characterized in that: include: A storage member, wherein the upper end of the storage member is provided with a groove adapted to the torsion spring, and the two ends of the torsion spring are respectively provided with a first arm and a second arm. When the torsion spring is placed in the groove, the first arm is inclined upward relative to the horizontal plane, and the second arm is arranged vertically; A pressing arm, the pressing arm being arranged on one side of the placement member, and a limiting portion corresponding to the torsion spring being arranged on a side of the pressing arm facing the placement member, the pressing arm being capable of horizontal linear movement in the direction of the torsion spring so that a space is formed between the limiting portion and the groove, and the torsion spring is capable of rotating in the space; as well as A pushing arm is arranged on the side of the pressing arm corresponding to the first arm, and is tilted upward. The pushing arm can move upward along its tilted direction to push the first arm, so that the torsion spring rotates to make the second arm rest against the side wall of the groove corresponding to it, and twist the first arm to the installation position.
2. A torsion spring positioning device according to claim 1, characterized in that: Also includes: a base, on which the storage element is detachably disposed, and an upper end of the storage element extends from an upper end of the base; as well as A lifting plate capable of moving up and down, wherein the lifting plate has a first position, a second position, and a third position sequentially arranged from bottom to top; When the lifting plate moves from the first position to the second position, it can drive the pressing arm and the pushing arm to move horizontally and linearly in the direction of the torsion spring; When the lifting plate moves from the second position to the third position, it can drive the pushing arm to move upward along its inclined direction.
3. A torsion spring positioning device according to claim 2, characterized in that: Also includes: A trigger member is arranged below the base, a rolling member is provided at the lower end of the lifting plate, and an upwardly inclined slope is provided at the upper end of the trigger member. The rolling member can climb from the lower end of the slope to the upper end of the slope to drive the lifting plate to move upward from the first position to the second position and the third position.
4. A torsion spring positioning device according to claim 3, characterized in that: Also includes: An elastic member is connected to the base and the lifting plate, and when the rolling member is disconnected from the ramp, the elastic member can drive the lifting plate to move from the third position to the first position via the second position.
5. A torsion spring positioning device according to claim 4, characterized in that: The elastic member is a return spring.
6. A torsion spring positioning device according to claim 2, characterized in that: The base is provided with a movable opening running through the upper and lower ends thereof, the lifting plate is adapted to the movable opening, the upper end of the lifting plate is provided with an opening, the pressing arm is provided at the opening, the opening forms two connecting walls at the upper end of the lifting plate, the connecting wall is provided with a first guide hole and a second guide hole inclined in a direction away from the torsion spring, the first guide hole and the second guide hole have the same inclination angle, two first guide holes are provided at intervals along the movement direction of the pressing arm, and the second guide hole is located above the first guide hole; The movable port is provided with a third guide hole on an inner wall corresponding to the first guide hole, the third guide hole being arranged along the movement direction of the press arm, the press arm is provided with a first connecting member corresponding to the first guide hole, both ends of the first connecting member respectively pass through the corresponding first guide hole and extend into the corresponding third guide hole; A guide groove is provided on the side of the pressing arm facing the pushing arm, and the guide groove has the same inclination direction as the pushing arm. The pushing arm is arranged in the guide groove, and a first avoidance hole is provided on the inner bottom wall of the guide groove along its inclination direction. A second connecting piece is provided on the pushing arm, one end of which passes through the first avoidance hole, and both ends of the second connecting piece extend into the corresponding second guide holes respectively.
7. A torsion spring positioning device according to claim 6, characterized in that: A second avoidance hole is vertically arranged at the lower end of the first guide hole, and the lower end of the first guide hole is connected to the upper end of the second avoidance hole; a fourth guide hole is horizontally arranged at the lower end of the second guide hole, and the second guide hole is connected to the end of the fourth guide hole away from the torsion spring.
8. A torsion spring positioning device according to any one of claims 1 to 7, characterized in that: A mounting hole is provided on the inner wall of the profile groove, and an adsorption component for adsorbing the torsion spring is provided at the mounting hole.
9. A torsion spring positioning device according to claim 8, characterized in that: The adsorption member is a magnet.
10. A torsion spring positioning device according to any one of claims 1 to 7, characterized in that: The side of the pressing arm facing the torsion spring is provided with an inclined surface inclined in a direction away from the torsion spring, the limiting portion is provided on the inclined surface and close to the upper end of the inclined surface, and the limiting portion is an arc-shaped notch adapted to the outer side wall of the torsion spring.