Self-locking device

Abstract

The utility model provides a self-locking device, and relates to the technical field of locks. The self-locking device comprises a guide rail, a locking assembly and a moving part. The locking assembly is arranged at one end of the guide rail in a pressing mode and comprises a pressing piece, the pressing piece is provided with a first position and a second position, the first position and the second position are arranged in the length direction of the guide rail, and the pressing piece is switched between the first position and the second position through pressing; the moving part is arranged on the guide rail in a sliding mode, the moving part and the pressing part are magnetically attracted, and the moving part is in an unlocking state when the pressing part is located at the first position and is in a locking state when the pressing part is located at the second position. According to the self-locking device, mechanical self-locking of the moving part is achieved through magnetic attraction of the pressing part and the moving part in the locking assembly, an external stop structure is optimized, meanwhile, abrasion is avoided, long-time reliable operation can be achieved, and the service life is longer.

Description

Technical Field

[0001] The utility model relates to the technical field of locks, in particular to a self-locking device. Background Art

[0002] In order to keep the self-locking parts locked after moving to the specified position, the conventional method is to set a stop structure on the outside of the parts. However, the stop structure will wear with the parts during the locking and unlocking process, and it is easy to fail after a period of time, and the service life is short. Utility Model Content

[0003] In order to solve the problems existing in the prior art, the purpose of the utility model is to provide a self-locking device.

[0004] The utility model provides the following technical solutions:

[0005] A self-locking device, comprising:

[0006] guide;

[0007] a locking assembly, which is pressably arranged at one end of the guide rail, the locking assembly comprising a pressing member, the pressing member having a first position and a second position, the first position and the second position being arranged along the length direction of the guide rail, and the pressing member is switched between the first position and the second position by pressing; and

[0008] The moving part is slidably arranged on the guide rail, the moving part is magnetically adsorbed to the pressing part, the moving part is in an unlocked state when the pressing part is located at the first position, and is in a locked state when the pressing part is located at the second position.

[0009] As a further optional solution for the self-locking device, a ferromagnetic part is provided on the moving part, and a magnetic part is provided on the pressing part, and the magnetic part is magnetically adsorbed to the ferromagnetic part.

[0010] As a further optional solution of the self-locking device, a first fixing groove is provided at one end of the moving member close to the pressing member, and the ferromagnetic member is arranged in the first fixing groove;

[0011] A second fixing groove is arranged at one end of the pressing member close to the moving member, and the magnetic member is arranged in the second fixing groove.

[0012] As a further optional solution of the self-locking device, the locking assembly further includes a first elastic member and a crank, the first elastic member abuts against the pressing member in a direction opposite to the pressing direction, the crank is rotatably disposed on the guide rail, and a guide portion is disposed on the crank;

[0013] The pressing member is provided with a first guide groove, a second guide groove, a third guide groove and a fourth guide groove which are slidably matched with the guide portion, an end of the first guide groove away from the moving member is communicated with an end of the fourth guide groove away from the moving member, an end of the first guide groove close to the moving member is communicated with an end of the second guide groove close to the moving member, an end of the second guide groove away from the moving member is communicated with an end of the third guide groove away from the moving member, and an end of the third guide groove close to the moving member is communicated with an end of the fourth guide groove close to the moving member;

[0014] Wherein, the guide portion is located at the connection between the first guide groove and the fourth guide groove when the pressing member is located at the first position, and the guide portion is located at the connection between the second guide groove and the third guide groove when the pressing member is located at the second position.

[0015] As a further optional solution for the self-locking device, the locking assembly also includes a second elastic member, which is arranged on the guide rail, the second elastic member resists the crank, and is used to make the guide part slide along the second guide groove toward the third guide groove, and to make the guide part slide along the third guide groove toward the fourth guide groove.

[0016] As a further optional solution for the self-locking device, a mounting seat is provided on the guide rail, and the crank and the second elastic member are both provided on the mounting seat.

[0017] As a further optional solution for the self-locking device, a crank shaft is provided on the mounting seat, one end of the crank is rotatably sleeved on the crank shaft, and the other end of the crank is provided with the guide portion.

[0018] As a further optional solution for the self-locking device, a fixing column is provided on the mounting seat, the second elastic member is a torsion spring, the torsion spring is sleeved on the fixing column, and the torsion arm of the torsion spring abuts against the crank.

[0019] As a further optional solution for the self-locking device, the mounting seat is detachably connected to the guide rail, a positioning column is provided on the mounting seat, and a positioning hole cooperating with the positioning column is provided on the guide rail.

[0020] As a further optional solution of the self-locking device, a guide column is provided on the side of the pressing member facing away from the moving member, and an elastic plug is passed through one end of the guide rail close to the pressing member;

[0021] The first elastic member is a tower spring, the tower top of the tower spring is sleeved on the guide column, and the tower bottom of the tower spring is sleeved on the elastic plug.

[0022] The embodiments of the present invention have the following beneficial effects:

[0023] When the pressing piece in the above-mentioned self-locking device is located at the first position, the movable part is in an unlocked state. The movable part moves along the guide rail and presses the pressing piece, so that the pressing piece can be switched from the first position to the second position. At this time, the movable part is magnetically adsorbed by the pressing piece and remains in a locked state. Subsequently, the movable part moves along the guide rail again and presses the pressing piece, so that the pressing piece can be switched from the second position to the first position, and the movable part is in an unlocked state again. The above-mentioned self-locking device utilizes the magnetic adsorption of the pressing piece and the movable part in the locking assembly to realize the mechanical self-locking of the movable part, optimizes the external stop structure, and avoids wear and tear at the same time, can operate reliably for a long time, and has a longer service life.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 The figure shows a schematic diagram of the overall axonometric structure of a self-locking device provided by an embodiment of the utility model;

[0027] Figure 2 A schematic structural diagram of a locking assembly in a self-locking device provided by an embodiment of the utility model is shown;

[0028] Figure 3 A schematic structural diagram of a pressing member in a self-locking device provided by an embodiment of the utility model is shown;

[0029] Figure 4 A schematic diagram showing the connection relationship between a pressing member and a first resetting member in a self-locking device provided by an embodiment of the utility model is shown;

[0030] Figure 5 A schematic diagram showing the connection relationship between a first reset member and a slide rail in a self-locking device provided by an embodiment of the utility model is shown;

[0031] Figure 6 A schematic diagram showing the connection relationship between a locking assembly and a slide rail in a self-locking device provided by an embodiment of the utility model is shown;

[0032] Figure 7A schematic structural diagram of a mounting seat in a self-locking device provided by an embodiment of the utility model is shown;

[0033] Figure 8 A schematic structural diagram of a moving part in a self-locking device provided by an embodiment of the utility model is shown;

[0034] Fig. 9 A schematic diagram showing the connection relationship between a moving part and a pressing part in a self-locking device provided by an embodiment of the utility model is shown.

[0035] Description of main component symbols:

[0036] 100-guide rail; 110-elastic plug; 120-mounting hole; 130-mounting seat; 131-crank shaft; 132-fixing column; 133-screw hole; 134-positioning column; 140-through hole; 150-tapping hole; 160-positioning hole; 200-locking assembly; 210-pressing member; 211-first guide groove; 212-second guide groove; 213-third guide groove; 214-fourth guide groove; 215-guide column; 216-magnetic member; 217-second fixed groove; 220-first elastic member; 221-tower top; 222-tower bottom; 230-crank; 231-guide part; 232-crank hole; 240-second elastic member; 300-moving member; 310-ferromagnetic member; 320-first fixed groove. DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments 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 only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of the template herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0042] Example

[0043] See also Figure 1 This embodiment provides a self-locking device, specifically a magnetic crank type self-locking device, which is composed of a guide rail 100, a locking assembly 200 and a moving part 300.

[0044] The locking assembly 200 is pressably disposed at one end of the guide rail 100, and includes a pressing member 210. The pressing member 210 has a first position and a second position, and the first position and the second position are arranged along the length direction of the guide rail 100. By pressing, the pressing member 210 switches between the first position and the second position.

[0045] Accordingly, the moving member 300 is slidably disposed on the guide rail 100, and the moving member 300 is magnetically attracted to the pressing member 210. In addition, the moving member 300 is in an unlocked state when the pressing member 210 is located at the first position, and is in a locked state when the pressing member 210 is located at the second position.

[0046] When the pressing member 210 in the above-mentioned self-locking device is located at the first position, the moving member 300 is in an unlocked state. The moving member 300 moves along the guide rail 100 and presses the pressing member 210, so that the pressing member 210 can be switched from the first position to the second position. At this time, the moving member 300 is magnetically adsorbed by the pressing member 210 and remains in a locked state. Subsequently, the moving member 300 moves along the guide rail 100 again and presses the pressing member 210, so that the pressing member 210 can be switched from the second position to the first position, and the moving member 300 is in an unlocked state again. The above-mentioned self-locking device utilizes the pressing member 210 in the locking assembly 200 and the moving member 300 magnetic adsorption to realize the mechanical self-locking of the moving member 300, optimizes the external stop structure, avoids wear and tear, can operate reliably for a long time, and has a longer service life.

[0047] Please also read Figure 2 and Figure 3 Specifically, the locking assembly 200 further includes a first elastic member 220 and a crank 230 .

[0048] The first elastic member 220 abuts against the pressing member 210 in a direction opposite to the pressing direction. When the moving member 300 moves along the guide rail 100 and presses the pressing member 210, the elastic force of the first elastic member 220 needs to be overcome.

[0049] The crank 230 is rotatably arranged on the guide rail 100, and a guide portion 231 is arranged on the crank 230. Correspondingly, the pressing member 210 is provided with a first guide groove 211, a second guide groove 212, a third guide groove 213 and a fourth guide groove 214 that are slidably matched with the guide portion 231. An end of the first guide groove 211 away from the moving member 300 is communicated with an end of the fourth guide groove 214 away from the moving member 300, an end of the first guide groove 211 close to the moving member 300 is communicated with an end of the second guide groove 212 close to the moving member 300, an end of the second guide groove 212 away from the moving member 300 is communicated with an end of the third guide groove 213 away from the moving member 300, and an end of the third guide groove 213 close to the moving member 300 is communicated with an end of the fourth guide groove 214 close to the moving member 300.

[0050] The guide portion 231 is located at the connection between the first guide groove 211 and the fourth guide groove 214 when the pressing member 210 is at the first position, and is located at the connection between the second guide groove 212 and the third guide groove 213 when the pressing member 210 is at the second position.

[0051] Exemplarily, when the guide portion 231 is located at the connection between the first guide groove 211 and the fourth guide groove 214, the moving member 300 moves along the guide rail 100 and presses the pressing member 210, so that the pressing member 210 moves relative to the guide portion 231. With the pressing member 210 as a reference, the guide portion 231 slides along the first guide groove 211 and slides from one end of the first guide groove 211 away from the moving member 300 to one end of the first guide groove 211 close to the moving member 300.

[0052] Subsequently, release the moving member 300, and finish pressing the pressing member 210. Under the effect of the first reset member, the pressing member 210 moves in the opposite direction with respect to the guide portion 231. With reference to the pressing member 210, the guide portion 231 enters the second guide groove 212 from an end of the second guide groove 212 near the moving member 300, and slides along the second guide groove 212, until sliding to an end of the second guide groove 212 away from the moving member 300. Because the end of the second guide groove 212 away from the moving member 300 is communicated with the end of the 3rd guide groove 213 away from the moving member 300, the guide portion 231 can't continue to slide, but remains at the junction of the second guide groove 212 and the 3rd guide groove 213. At this moment, the pressing member 210 is located at the second position, and the moving member 300 is in a locked state, and the force applied to the pressing member 210 by the first reset member and the force applied to the pressing member 210 by the guide portion 231 are equal in magnitude and opposite in direction, and reach balance.

[0053] On this basis, the moving member 300 is moved again along the guide rail 100 and presses the pressing member 210, so that the pressing member 210 is moved again relative to the guide portion 231. With the pressing member 210 as a reference, the guide portion 231 enters the third guide groove 213 from the end of the third guide groove 213 away from the moving member 300, and slides along the third guide groove 213 until it slides to the end of the third guide groove 213 close to the moving member 300.

[0054] Subsequently, release the moving member 300, and finish pressing the pressing member 210. Under the effect of the first reset member, the pressing member 210 moves in the opposite direction with respect to the guide portion 231 again. With reference to the pressing member 210, the guide portion 231 enters the fourth guide groove 214 from an end of the fourth guide groove 214 near the moving member 300, and slides along the fourth guide groove 214, until sliding to an end of the fourth guide groove 214 away from the moving member 300. Because the end of the fourth guide groove 214 away from the moving member 300 is communicated with the end of the first guide groove 211 away from the moving member 300, the guide portion 231 can not continue to move, but remains at the junction of the fourth guide groove 214 and the first guide groove 211. At this moment, the pressing member 210 is located at the first position, and the moving member 300 is in an unlocked state, and the force applied to the pressing member 210 by the first reset member and the force applied to the pressing member 210 by the guide portion 231 are equal in magnitude and opposite in direction, and reach balance.

[0055] Thus, by pressing, the pressing member 210 switches between the first position and the second position. In this process, the crank 230 swings back and forth as the guide portion 231 slides.

[0056] Please also read Figure 4 and Figure 5 In some embodiments, a guide post 215 is disposed on the side of the pressing member 210 facing away from the moving member 300 , and an elastic plug 110 is penetrated through one end of the guide rail 100 close to the pressing member 210 .

[0057] Correspondingly, the first elastic member 220 is a tower spring, and a tower top portion 221 of the tower spring is sleeved on the guide pillar 215 , and a tower bottom portion 222 of the tower spring is sleeved on the elastic plug 110 .

[0058] During assembly, first, the tower top 221 of the tower spring is sleeved on the guide column 215, then the pressing piece 210 and the tower spring are put into the guide rail 100, and then the elastic plug 110 is inserted into the guide rail 100 and the tower bottom 222 of the tower spring in sequence.

[0059] After the assembly is completed, an interference fit is formed between the elastic plug 110 and the guide rail 100, and the friction force is used to keep them relatively fixed, and the tower spring is in a compressed state.

[0060] When the moving member 300 moves along the guide rail 100 and presses the pressing member 210, the tower spring is further compressed. After the moving member 300 is released and the pressing member 210 is finished, the elastic potential energy stored in the tower spring is released, driving the pressing member 210 and the moving member 300 to move in the opposite direction along the guide rail 100.

[0061] Optionally, two groups of guide pillars 215, elastic plugs 110 and tower springs are provided to make the force on the pressing member 210 more uniform. The elastic plug 110 is made of rubber, and a mounting hole 120 is provided on the guide rail 100 for the elastic plug 110 to penetrate.

[0062] Please refer again Figure 2 and Figure 3 Furthermore, the locking assembly 200 also includes a second elastic member 240 .

[0063] The second elastic member 240 is disposed on the guide rail 100 , and abuts against the crank 230 , and is used to make the guide portion 231 slide along the second guide groove 212 toward the third guide groove 213 , and to make the guide portion 231 slide along the third guide groove 213 toward the fourth guide groove 214 .

[0064] With the pressing member 210 as a reference, when the guide portion 231 slides from the end of the first guide groove 211 away from the moving member 300 to the end of the first guide groove 211 close to the moving member 300, the crank 230 swings against the elastic force of the second elastic member 240. After the pressing of the pressing member 210 is finished, the second elastic member 240 drives the crank 230 to swing in the opposite direction, so that the guide portion 231 slides along the second guide groove 212 toward the third guide groove 213, ensuring that the guide portion 231 smoothly enters the second guide groove 212 from the end of the second guide groove 212 close to the moving member 300.

[0065] When pressed again, the second elastic member 240 can also make the guide portion 231 slide along the third guide groove 213 toward the fourth guide groove 214 to ensure that the guide portion 231 smoothly enters the third guide groove 213 from the first end of the third guide groove 213 away from the moving member 300 .

[0066] Please also read Figure 6 and Figure 7 In some embodiments, a mounting seat 130 is disposed on the guide rail 100 , and the crank 230 and the second elastic member 240 are both disposed on the mounting seat 130 .

[0067] Specifically, the mounting seat 130 is provided with a crank shaft 131. One end of the crank 230 is provided with a crank hole 232, and is rotatably sleeved on the crank shaft 131 through the crank hole 232, and is further rotatably provided on the guide rail 100, and the other end of the crank 230 is provided with a guide portion 231.

[0068] In addition, a through hole 140 is further provided on the guide rail 100 , and one end of the crank shaft 131 away from the mounting seat 130 passes through the through hole 140 .

[0069] Specifically, a fixing column 132 is disposed on the mounting seat 130 , and the axis of the fixing column 132 is parallel to the axis of the crank shaft 131 .

[0070] Correspondingly, the second elastic member 240 is a torsion spring which is sleeved on the fixing column 132 , and the torsion arm of the torsion spring abuts against the crank 230 .

[0071] Furthermore, the mounting seat 130 is detachably connected to the guide rail 100 to facilitate the installation of the crank 230 and the second elastic member 240 .

[0072] Exemplarily, the mounting seat 130 and the guide rail 100 are fixed by screws, and the screws pass through the screw holes 133 on the mounting seat 130 and then threadably engage with the tapped holes 150 on the guide rail 100 .

[0073] In addition, a positioning column 134 is provided on the mounting seat 130 , and a positioning hole 160 matched with the positioning column 134 is provided on the guide rail 100 , so as to position the mounting seat 130 when the mounting seat 130 and the guide rail 100 are connected.

[0074] Please also read Figure 8 and Fig. 9 Specifically, a ferromagnetic member 310 is disposed on the moving member 300, and a magnetic member 216 is disposed on the pressing member 210. The magnetic member 216 and the ferromagnetic member 310 are magnetically attracted to each other, so that the moving member 300 and the pressing member 210 are magnetically attracted to each other.

[0075] Exemplarily, the ferromagnetic member 310 is a magnetic sheet, and the magnetic member 216 is a magnet.

[0076] In some embodiments, the moving member 300 is a moving box, and a first fixing groove 320 is disposed at one end of the moving member 300 close to the pressing member 210 , and the ferromagnetic member 310 is disposed in the first fixing groove 320 .

[0077] Similarly, a second fixing groove 217 is disposed at one end of the pressing member 210 close to the moving member 300 , and the magnetic member 216 is disposed in the second fixing groove 217 .

[0078] In summary, the above-mentioned self-locking device utilizes the magnetic adsorption between the pressing part 210 in the locking assembly 200 and the moving part 300 to realize the mechanical self-locking of the moving part 300, optimizes the external stop structure, simplifies the structure, and avoids wear and tear, so that it can operate reliably for a long time and has a longer service life.

[0079] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0080] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0081] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A self-locking device, characterized in that: include: guide; A locking assembly is pressably arranged at one end of the guide rail, the locking assembly includes a pressing member, the pressing member has a first position and a second position, the first position and the second position are arranged along the length direction of the guide rail, and the pressing member is switched between the first position and the second position by pressing; as well as The moving part is slidably arranged on the guide rail, the moving part is magnetically adsorbed to the pressing part, the moving part is in an unlocked state when the pressing part is located at the first position, and is in a locked state when the pressing part is located at the second position.

2. The self-locking device according to claim 1, characterized in that: The moving part is provided with a ferromagnetic part, the pressing part is provided with a magnetic part, and the magnetic part is magnetically adsorbed to the ferromagnetic part.

3. The self-locking device according to claim 2, characterized in that: A first fixing groove is provided at one end of the moving member close to the pressing member, and the ferromagnetic member is arranged in the first fixing groove; A second fixing groove is arranged at one end of the pressing member close to the moving member, and the magnetic member is arranged in the second fixing groove.

4. The self-locking device according to claim 1, 2 or 3, characterized in that: The locking assembly further comprises a first elastic member and a crank, wherein the first elastic member abuts against the pressing member in a direction opposite to the pressing direction, the crank is rotatably disposed on the guide rail, and a guide portion is disposed on the crank; The pressing member is provided with a first guide groove, a second guide groove, a third guide groove and a fourth guide groove which are slidably matched with the guide portion, an end of the first guide groove away from the moving member is communicated with an end of the fourth guide groove away from the moving member, an end of the first guide groove close to the moving member is communicated with an end of the second guide groove close to the moving member, an end of the second guide groove away from the moving member is communicated with an end of the third guide groove away from the moving member, and an end of the third guide groove close to the moving member is communicated with an end of the fourth guide groove close to the moving member; Wherein, the guide portion is located at the connection between the first guide groove and the fourth guide groove when the pressing member is located at the first position, and the guide portion is located at the connection between the second guide groove and the third guide groove when the pressing member is located at the second position.

5. The self-locking device according to claim 4, characterized in that: The locking assembly also includes a second elastic member, which is arranged on the guide rail, the second elastic member abuts against the crank, and is used to make the guide part slide along the second guide groove toward the third guide groove, and to make the guide part slide along the third guide groove toward the fourth guide groove.

6. The self-locking device according to claim 5, characterized in that: A mounting seat is arranged on the guide rail, and the crank and the second elastic member are both arranged on the mounting seat.

7. The self-locking device according to claim 6, characterized in that: A crank shaft is arranged on the mounting seat, one end of the crank is rotatably sleeved on the crank shaft, and the other end of the crank is arranged on the guide part.

8. The self-locking device according to claim 6, characterized in that: A fixing column is arranged on the mounting seat, and the second elastic member is a torsion spring. The torsion spring is sleeved on the fixing column, and the torsion arm of the torsion spring abuts against the crank.

9. The self-locking device according to claim 6, characterized in that: The mounting seat is detachably connected to the guide rail, a positioning column is provided on the mounting seat, and a positioning hole matched with the positioning column is provided on the guide rail.

10. The self-locking device according to claim 4, characterized in that: A guide column is provided on the side of the pressing member facing away from the moving member, and an elastic plug is passed through one end of the guide rail close to the pressing member; The first elastic member is a tower spring, the tower top of the tower spring is sleeved on the guide column, and the tower bottom of the tower spring is sleeved on the elastic plug.

Images