Telescopic device

Abstract

According to the telescopic device, under the elastic force effect of a first elastic piece, a clamping protrusion of a second movable piece abuts against a first guide face of a first movable piece, and due to the fact that the first guide face extends around a mounting shaft in a threaded mode, when the second movable piece and the first movable piece rotate relatively around the mounting shaft, the clamping protrusion is clamped on the first guide face. The clamping bulge can move along the first guide surface, so that the first movable part and the second movable part are relatively far away from and close to each other in the axial direction of the mounting shaft, and the expansion and contraction of the expansion and contraction device disclosed by the utility model are realized; due to the fact that the multiple clamping grooves distributed in the extending direction of the first guide face at intervals are formed in the first guide face, in the process that the clamping protrusions move along the first guide face, the clamping protrusions can be inserted into the clamping grooves, relative locking between the first movable part and the second movable part is achieved, and then the self-locking capacity of the telescopic device is improved.

Description

Technical Field

[0001] This utility model relates to the field of telescopic components technology, and in particular to a telescopic device. Background Technology

[0002] Telescopic devices are widely used in many devices due to their expandable and contractible properties. For example, using telescopic devices in the brackets of display devices allows the overall size of the bracket to be adjusted, facilitating the storage and transportation of the display devices.

[0003] The telescopic device in the related technology includes a first movable member and a second movable member. The first movable member is provided with an external thread, and the second movable member is provided with an internal thread. The first movable member and the second movable member are connected by the meshing external thread and internal thread. When the telescopic device needs to extend or retract, the user rotates the second movable member in the forward or reverse direction relative to the first movable member.

[0004] If the user accidentally rotates the second moving part after the telescopic device has extended to the specified length, the extension length of the telescopic device will easily change, resulting in poor self-locking ability of the existing telescopic device after it has extended to the specified length. Utility Model Content

[0005] The purpose of this invention is to at least solve one of the technical problems existing in the prior art. This invention provides a telescopic device with better self-locking capability.

[0006] The telescopic device according to an embodiment of the present invention includes a mounting shaft, a first movable member, a second movable member, and a first elastic member. The first movable member is slidably sleeved on the mounting shaft and has a first guide surface that extends spirally around the mounting shaft. The first guide surface has a plurality of slots spaced apart along the extension direction of the first guide surface. The second movable member is slidably sleeved on the mounting shaft and has a snap-fit ​​protrusion for inserting into the slot. The first elastic member is disposed on the mounting shaft and is connected to at least one of the first and second movable members. The first elastic member is used to provide a way to keep the snap-fit ​​protrusion abutting against the first guide surface.

[0007] The telescopic device described in this utility model has at least the following beneficial effects: In the telescopic device of this application, under the elastic force of the first elastic member, the snap-fit ​​protrusion of the second movable member abuts against the first guide surface of the first movable member. Since the first guide surface extends threadedly around the mounting shaft, when the second movable member and the first movable member rotate relative to each other around the mounting shaft, the snap-fit ​​protrusion can move along the first guide surface to realize the relative separation and proximity of the first movable member and the second movable member along the axial direction of the mounting shaft, thereby realizing the telescopic extension of the telescopic device of this application; Since the first guide surface is provided with a plurality of slots spaced apart along the extension direction of the first guide surface, during the process of the snap-fit ​​protrusion moving along the first guide surface, the snap-fit ​​protrusion can be inserted into the slot to realize the relative locking between the first movable member and the second movable member, thereby improving the self-locking capability of the telescopic device of this application.

[0008] The telescopic device according to the embodiment of this utility model further includes a third movable member, which is sleeved on the mounting shaft. The third movable member is provided with a second guide surface for abutting the snap-fit ​​protrusion. The second guide surface extends spirally around the mounting shaft, and the spiral direction is the same as that of the first guide surface. Along the axial direction of the mounting shaft, the third movable member is movably disposed relative to the first movable member. Under the action of external force, the first movable member and the third movable member can move relative to each other along the axial direction of the mounting shaft so that the snap-fit ​​protrusion abuts against the first guide surface or the second guide surface.

[0009] The telescopic device according to the embodiment of the present invention further includes a second elastic member, which is connected to the first movable member and the third movable member respectively, and is used to provide an elastic force to keep the third movable member away from the second movable member.

[0010] According to the telescopic device described in this embodiment of the present invention, the third movable member is slidably sleeved on the first movable member along the axial direction of the mounting shaft. The outer periphery of the first movable member is provided with a first limiting protrusion, and the inner periphery of the third movable member is provided with a second limiting protrusion. Along the axial direction of the mounting shaft, the first limiting protrusion is located on the side of the second limiting protrusion close to the second movable member. The second elastic member is disposed between the first limiting protrusion and the second limiting protrusion, and abuts against the first limiting protrusion and the second limiting protrusion respectively.

[0011] According to the telescopic device described in the embodiment of this utility model, the second elastic element is a spring, which is sleeved on the first movable element. The first limiting protrusion and the second limiting protrusion are both annular rings arranged around the mounting shaft.

[0012] The telescopic device according to the embodiment of the present utility model further includes a first sleeve and a pressing member. The first sleeve is sleeved on the first movable member, and a first receiving area is formed between the first sleeve and the first movable member. The third movable member is disposed in the first receiving area, and the pressing member is disposed on the side of the first sleeve away from the second movable member. The third movable member has a connecting part, which passes through the first sleeve and is connected to the pressing member.

[0013] According to the telescopic device described in this embodiment of the present invention, the inner peripheral wall of the first sleeve is provided with a guide groove extending axially along the mounting shaft, and the third movable member is provided with a guide protrusion, which is slidably inserted into the guide groove.

[0014] According to the telescopic device described in the embodiment of this utility model, the slot has a first slot wall and a second slot wall that are smoothly connected to the first guide surface. In the direction of spiraling towards the second movable member along the first guide surface, the first slot wall is located on the side of the second slot wall that is close to the second movable member, and the included angle between the first slot wall and the first guide surface is smaller than the included angle between the second slot wall and the first guide surface.

[0015] According to the telescopic device described in the embodiment of this utility model, the first movable member is provided with a plurality of first guide surfaces, which are distributed circumferentially around the mounting axis, and the second movable member is provided with a plurality of snap-fit ​​protrusions corresponding to the first guide surfaces.

[0016] The telescopic device according to the embodiment of the present utility model further includes a second sleeve, which is sleeved on the mounting shaft, and a second receiving area is formed between the second sleeve and the mounting shaft, and a second movable member is disposed in the second receiving area.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0019] Figure 1 This is a schematic diagram of the structure of a telescopic device according to an embodiment of the present invention;

[0020] Figure 2 for Figure 1 A cross-sectional view of the telescopic device shown;

[0021] Figure 3 for Figure 1 Exploded view of the telescopic device shown;

[0022] Figure 4 for Figure 3 A schematic diagram of the structure of the first movable component of the telescopic device shown;

[0023] Figure 5 for Figure 4 A partially enlarged view of the structure at point A of the first movable component shown;

[0024] Figure 6 for Figure 3 A schematic diagram of the structure of the third movable component of the telescopic device shown.

[0025] Figure label:

[0026] Mounting shaft 100;

[0027] First movable component 200; first guide surface 210; slot 211; first slot wall 211a; second slot wall 211b; first limiting protrusion 220;

[0028] Second movable part 300; snap-fit ​​protrusion 310;

[0029] First elastic element 400;

[0030] Third movable component 500; second guide surface 510; second limiting protrusion 520; connecting part 530; guide protrusion 540;

[0031] Second elastic element 600;

[0032] First sleeve 700; guide groove 710;

[0033] Pressing element 800;

[0034] Second sleeve 900. Detailed Implementation

[0035] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0036] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0038] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0039] The following is for reference. Figures 1 to 6 The telescopic device of this application will be described in detail.

[0040] refer to Figures 1 to 4 The telescopic device according to an embodiment of the present invention includes a mounting shaft 100, a first movable member 200, a second movable member 300, and a first elastic member 400. The first movable member 200 is slidably sleeved on the mounting shaft 100, and the first movable member 200 is provided with a first guide surface 210 extending spirally around the mounting shaft 100. The first guide surface 210 is provided with a plurality of slots 211 spaced apart along the extension direction of the first guide surface 210. The second movable member 300 is slidably sleeved on the mounting shaft 100, and the second movable member 300 is provided with a snap-fit ​​protrusion 310 for inserting into the slot 211. The first elastic member 400 is provided on the mounting shaft 100 and is connected to at least one of the first movable member 200 and the second movable member 300. The first elastic member 400 is used to provide a way to keep the snap-fit ​​protrusion 310 abutting against the first guide surface 210.

[0041] For example, such as Figures 2 to 4 As shown, the mounting shaft 100 extends vertically. The first movable member 200 is slidably sleeved on the mounting shaft 100 in the vertical direction and can rotate relative to the mounting shaft 100. The second movable member 300 is slidably sleeved on the mounting shaft 100 in the vertical direction and is located directly below the first movable member 200. The lower end of the first movable member 200 is provided with a first guide surface 210, which extends spirally around the mounting shaft 100. The first guide surface 210 is provided with multiple slots 211, which are spaced apart along the extension direction of the first guide surface 210. The upper end of the second movable member 300 is provided with a snap-fit ​​protrusion 310. The first elastic member 400 is connected to the mounting shaft 100 and the second movable member 300 respectively and is used to provide an elastic force to bring the second movable member 300 closer together, so that the snap-fit ​​protrusion 310 on the second movable member 300 abuts against the first guide surface 210 of the first movable member 200.

[0042] When the telescopic device of this utility model is in operation, when the telescopic device needs to be extended, the user can rotate the first movable member 200 in the forward direction so that the locking protrusion 310 gradually moves away from the first movable member 200 along the first guide surface 210. During this process, the first movable member 200 and the second movable member 300 move away from each other to achieve the extension of the telescopic device. When the telescopic device needs to be shortened, the user can rotate the first movable member 200 in the reverse direction so that the locking protrusion 310 gradually moves closer to the first movable member 200 along the first guide surface 210. During this process, the first movable member 200 and the second movable member 300 move closer to each other to achieve the shortening of the telescopic device.

[0043] It is understandable that during the movement of the locking protrusion 310 along the first guide surface 210, since the first guide surface 210 is provided with multiple slots 211 and the multiple slots 211 are distributed at intervals along the extension direction of the first guide surface 210, the locking protrusion 310 can be locked into each slot 211 in sequence. After the locking protrusion 310 is locked into the slot 211, the user needs to apply more force to the first movable member 200 to make the locking protrusion 310 disengage from the slot 211. Thus, after the telescopic device extends and retracts a certain length, the locking protrusion 310 can be locked into one of the slots 211 to achieve self-locking of the telescopic device, thereby making the telescopic device of this utility model have a better self-locking effect.

[0044] In some embodiments of this utility model, the telescopic device further includes a third movable member 500, which is sleeved on the mounting shaft 100. The third movable member 500 is provided with a second guide surface 510 for abutting against the locking protrusion 310. The second guide surface 510 extends spirally around the mounting shaft 100, and the spiral direction is the same as that of the first guide surface 210. Along the axial direction of the mounting shaft 100, the third movable member 500 is movably disposed relative to the first movable member 200. Under the action of external force, the first movable member 200 and the third movable member 500 can move relative to each other along the axial direction of the mounting shaft 100, so that the locking protrusion 310 abuts against the first guide surface 210 or the second guide surface 510.

[0045] For example, such as Figure 2 and Figure 6 As shown, the third movable member 500 is sleeved on the first movable member 200. The lower end of the third movable member 500 is provided with a second guide surface 510. The second guide surface 510 extends spirally around the mounting shaft 100, and the spiral direction of the second guide surface 510 is the same as the spiral direction of the first guide surface 210. The third movable member 500 and the first movable member 200 are movably arranged relative to each other in the vertical direction.

[0046] Understandably, when the telescopic device needs to be shortened to its shortest state, the user can drive the third movable member 500 to move downward relative to the first movable member 200, so that the second guide surface 510 abuts against the locking protrusion 310, and the locking protrusion 310 disengages from the slot 211 and the first guide surface 210. At this time, under the elastic force of the first elastic member 400, the locking protrusion 310 slides along the second guide surface 510, so that the first movable member 200 moves closer to the second movable member 300 in sync with the third movable member 500, thereby shortening the telescopic device.

[0047] Understandably, the third movable part 500 allows the user to quickly adjust the telescopic device to its shortest state.

[0048] In a further embodiment of this utility model, reference is made to... Figure 2 and Figure 3 The telescopic device also includes a second elastic member 600, which is connected to the first movable member 200 and the third movable member 500 respectively, and is used to provide an elastic force to keep the third movable member 500 away from the second movable member 300.

[0049] Understandably, when the user applies external force to the third movable member 500, under the elastic force of the second elastic member 600, the first guide surface 210 is located below the second guide surface 510. At this time, the snap-fit ​​protrusion 310 can smoothly snap into the slot 211 of the first guide surface 210. When the user applies a downward external force to the third movable member 500, the third movable member 500 can overcome the elastic force of the second elastic member 600 so that the second guide surface 510 moves to the lower side of the first guide surface 210. At this time, the snap-fit ​​protrusion 310 abuts against the second guide surface 510. Under the elastic force of the first elastic member 400, the snap-fit ​​protrusion 310 can move along the second guide surface 510 so that the first movable member 200 follows the third movable member 500 closer to the second movable member 300, and the telescopic device automatically shortens.

[0050] It is understandable that the second elastic element 600 is provided so that, under normal conditions, the snap-fit ​​protrusion 310 of the second movable element 300 can stably abut against the first guide surface 210 or be inserted into the slot 211.

[0051] In a further embodiment of the present invention, the third movable member 500 is slidably sleeved on the first movable member 200 along the axial direction of the mounting shaft 100. The outer periphery of the first movable member 200 is provided with a first limiting protrusion 220, and the inner periphery of the third movable member 500 is provided with a second limiting protrusion 520. Along the axial direction of the mounting shaft 100, the first limiting protrusion 220 is located on the side of the second limiting protrusion 520 close to the second movable member 300. The second elastic member 600 is disposed between the first limiting protrusion 220 and the second limiting protrusion 520, and abuts against the first limiting protrusion 220 and the second limiting protrusion 520 respectively.

[0052] For example, such as Figure 2 As shown, the third movable member 500 is slidably sleeved on the first movable member 200 in the vertical direction. The inner circumferential surface of the third movable member 500 is provided with a second limiting protrusion 520, and the outer circumferential surface of the first movable member 200 is provided with a first limiting protrusion 220. The first limiting protrusion 220 is located below the second limiting protrusion 520. The second elastic member 600 is disposed between the first limiting protrusion 220 and the second limiting protrusion 520. The upper end and the lower end of the second elastic member 600 abut against the second limiting protrusion 520 and the first limiting protrusion 220, respectively.

[0053] Understandably, the second elastic member 600 can provide an upward elastic force relative to the first limiting protrusion 220 to the second limiting protrusion 520, so that the third movable member 500 can slide upward relative to the first movable member 200 under the elastic force of the second elastic member 600, so that when the third movable member 500 is not subjected to external force applied by the user, the first guide surface 210 of the first movable member 200 can be located below the second guide surface 510 of the third movable member 500, so that the snap-fit ​​protrusion 310 of the second movable member 300 can remain in contact with the first guide surface 210 or be inserted into the slot 211.

[0054] In some embodiments of this utility model, reference is made to Figure 2 The second elastic element 600 is a spring, which is sleeved on the first movable element 200. The first limiting protrusion 220 and the second limiting protrusion 520 are both annular rings arranged around the mounting shaft 100.

[0055] Understandably, springs have a simple structure, are inexpensive, and have excellent elastic properties.

[0056] It is understandable that both the first limiting protrusion 220 and the second limiting protrusion 520 are set in annular shape so that the upper end of the spring can fully contact the second limiting protrusion 520 and the lower end of the spring can fully contact the first limiting protrusion 220, thereby improving the uniformity of the force on the spring; at the same time, by sleeve the spring on the first movable member 200, the deformation of the spring in the horizontal direction can be reduced.

[0057] In some embodiments of this utility model, the telescopic device further includes a first sleeve 700 and a pressing member 800. The first sleeve 700 is sleeved on the first movable member 200, and a first receiving area is formed between the first sleeve 700 and the first movable member 200. The third movable member 500 is disposed in the first receiving area, and the pressing member 800 is disposed on the side of the first sleeve 700 away from the second movable member 300. The third movable member 500 has a connecting part 530, which passes through the first sleeve 700 and is connected to the pressing member 800.

[0058] For example, such as Figure 2 and Figure 3 As shown, the first sleeve 700 is sleeved on the first movable member 200 and fixedly connected to the first movable member 200. A first receiving area is formed between the first sleeve 700 and the first movable member 200. The third movable member 500 is disposed in the first receiving area. The upper end of the first sleeve 700 is provided with a through hole communicating with the first receiving area. The upper end of the third movable member 500 is provided with a connecting part 530, which passes through the through hole and is connected to the pressing member 800 located on the upper side of the first sleeve 700.

[0059] Understandably, the design of the pressing component 800 allows the user to drive the pressing component 800 to move up and down, which in turn drives the third movable component 500 to move up and down relative to the first movable component 200. The design of the pressing component 800 makes it simpler for the user to drive the third movable component 500 to move up and down relative to the first movable component 200.

[0060] It is understandable that the first sleeve 700 is provided so that a first receiving area can be formed between the first sleeve 700 and the first movable member 200. By placing the third movable member 500 in the first receiving area, the third movable member 500 can be protected. At the same time, the first sleeve 700 is sleeved on the first movable member 200 so that the first sleeve 700 can also protect the first movable member 200, thereby extending the service life of the telescopic device of this utility model.

[0061] In a further embodiment of this utility model, reference is made to... Figure 2 and Figure 6 The inner peripheral wall of the first sleeve 700 is provided with a guide groove 710 extending axially along the mounting shaft 100, and the third movable member 500 is provided with a guide protrusion 540, which is slidably inserted into the guide groove 710.

[0062] Understandably, the guide groove 710 and the guide protrusion 540 enable the third movable part 500 to move accurately along the axial direction of the mounting shaft 100 when subjected to external force.

[0063] In some embodiments of this utility model, reference is made to Figure 5 The slot 211 has a first slot wall 211a and a second slot wall 211b that are smoothly connected to the first guide surface 210. The first slot wall 211a is located on the side of the second slot wall 211b that is close to the second movable member 300 along the direction of spiraling towards the second movable member 300 along the first guide surface 210. The angle between the first slot wall 211a and the first guide surface 210 is smaller than the angle between the second slot wall 211b and the first guide surface 210.

[0064] It is understandable that, since the first groove wall 211a is located on the side of the second groove wall 211b closer to the second movable member 300, and the angle between the first groove wall 211a and the first guide surface 210 is smaller than the angle between the second groove wall 211b and the first guide surface 210, the force applied by the user to the first movable member 200 can be smaller when the second movable member 300 is away from the first movable member 200, and the force applied by the user to the first movable member 200 can be larger when the second movable member 300 is close to the first movable member 200. This makes the telescopic device of this utility model extend more easily, and makes it more difficult for the telescopic device of this utility model to shorten under the action of external force, thereby improving the self-locking ability of the telescopic device of this utility model.

[0065] In some embodiments of this utility model, reference is made to Figure 4 and Figure 6 The first movable component 200 is provided with multiple first guide surfaces 210, which are distributed circumferentially around the mounting shaft 100. The second movable component 300 is provided with multiple snap-fit ​​protrusions 310 corresponding to the first guide surfaces 210.

[0066] It is understood that by providing multiple first guide surfaces 210 on the first movable member 200, with the multiple first guide surfaces 210 distributed circumferentially around the mounting shaft 100, and providing multiple snap-fit ​​protrusions 310 on the second movable member 300 corresponding to the first guide surfaces 210, the force between the first movable member 200 and the second movable member 300 can be made more uniform, thereby extending the service life of the telescopic device of this utility model.

[0067] In some embodiments of this utility model, reference is made to Figures 1 to 3 The telescopic device also includes a second sleeve 900, which is sleeved on the mounting shaft 100. A second receiving area is formed between the second sleeve 900 and the mounting shaft 100, and the second movable member 300 is disposed in the second receiving area.

[0068] It is understood that by placing the second movable member 300 in the second receiving area between the second sleeve 900 and the mounting shaft 100, the second sleeve 900 can include the second movable member 300, thereby extending the service life of the telescopic device of this utility model.

[0069] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A telescopic device, characterized in that, include: Mounting shaft (100); The first movable part (200) is slidably sleeved on the mounting shaft (100). The first movable part (200) is provided with a first guide surface (210) that extends spirally around the mounting shaft (100). The first guide surface (210) is provided with a plurality of slots (211) that are spaced apart along the extension direction of the first guide surface (210). The second movable part (300) is slidably sleeved on the mounting shaft (100), and the second movable part (300) is provided with a snap-fit ​​protrusion (310) for inserting into the slot (211); A first elastic element (400) is disposed on the mounting shaft (100) and connected to at least one of the first movable element (200) and the second movable element (300), the first elastic element (400) being used to provide a way to keep the snap-fit ​​protrusion (310) abutting against the first guide surface (210).

2. The telescopic device according to claim 1, characterized in that, It also includes a third movable member (500) sleeved on the mounting shaft (100). The third movable member (500) is provided with a second guide surface (510) for abutting the snap-fit ​​protrusion (310). The second guide surface (510) extends spirally around the mounting shaft (100) and the spiral direction is the same as that of the first guide surface (210). Along the axial direction of the mounting shaft (100), the third movable member (500) is movably disposed relative to the first movable member (200). Under the action of external force, the first movable member (200) and the third movable member (500) can move relative to each other along the axial direction of the mounting shaft (100) so that the snap-fit ​​protrusion (310) abuts against the first guide surface (210) or the second guide surface (510).

3. A telescopic device according to claim 2, characterized in that, It also includes a second elastic element (600), which is connected to the first movable element (200) and the third movable element (500) respectively, and is used to provide an elastic force to keep the third movable element (500) away from the second movable element (300).

4. A telescopic device according to claim 3, characterized in that, The third movable member (500) is slidably sleeved on the first movable member (200) along the axial direction of the mounting shaft (100). The first movable member (200) has a first limiting protrusion (220) on its outer periphery and a second limiting protrusion (520) on its inner periphery. Along the axial direction of the mounting shaft (100), the first limiting protrusion (220) is located on the side of the second limiting protrusion (520) close to the second movable member (300). The second elastic member (600) is disposed between the first limiting protrusion (220) and the second limiting protrusion (520) and abuts against the first limiting protrusion (220) and the second limiting protrusion (520) respectively.

5. A telescopic device according to claim 4, characterized in that, The second elastic element (600) is a spring, which is sleeved on the first movable element (200). The first limiting protrusion (220) and the second limiting protrusion (520) are both annular rings arranged around the mounting shaft (100).

6. A telescopic device according to claim 2, characterized in that, It also includes a first sleeve (700) and a pressing member (800). The first sleeve (700) is sleeved on the first movable member (200). A first receiving area is formed between the first sleeve (700) and the first movable member (200). The third movable member (500) is disposed in the first receiving area. The pressing member (800) is disposed on the side of the first sleeve (700) away from the second movable member (300). The third movable member (500) has a connecting part (530). The connecting part (530) passes through the first sleeve (700) and is connected to the pressing member (800).

7. A telescopic device according to claim 6, characterized in that, The inner peripheral wall of the first sleeve (700) is provided with a guide groove (710) extending axially along the mounting shaft (100), and the third movable member (500) is provided with a guide protrusion (540), which is slidably inserted into the guide groove (710).

8. A telescopic device according to claim 1, characterized in that, The slot (211) has a first slot wall (211a) and a second slot wall that are smoothly connected to the first guide surface (210). (211b) Along the direction of spiraling towards the second movable member (300) along the first guide surface (210), the first groove wall (211a) is located on the side of the second groove wall (211b) that is close to the second movable member (300), and the included angle between the first groove wall (211a) and the first guide surface (210) is smaller than the included angle between the second groove wall (211b) and the first guide surface (210).

9. A telescopic device according to claim 1, characterized in that, The first movable component (200) is provided with a plurality of first guide surfaces (210), which are distributed circumferentially around the mounting shaft (100). The second movable component (300) is provided with a plurality of snap-fit ​​protrusions (310) corresponding to the first guide surfaces (210).

10. A telescopic device according to claim 1, characterized in that, It also includes a second sleeve (900), which is sleeved on the mounting shaft (100), and a second receiving area is formed between the second sleeve (900) and the mounting shaft (100), and the second movable member (300) is disposed in the second receiving area.

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