Self-locking mechanism and telescopic tube

Abstract

The utility model relates to the technical field of pipe material, and disclose a kind of self-locking mechanism between different diameter pipes and telescopic pipe, and self-locking mechanism includes outer tube, inner tube, wedge block assembly and outer wheel, outer tube is circumferentially provided with wedge block, by the mutual cooperation of outer wheel inner inclined plane and wedge block first outer taper surface, to lock or release inner tube by utilizing outer wheel rotation reverse action on wedge block and drive wedge block radial migration. Based on such structure, to realize only need to rotate outer wheel can realize inner tube locking or release, and outer wheel etc. Operating assembly is mutually locked, and operation installation is more flexible and fast, and telescopic pipe using the self-locking mechanism, telescopic adjustment locking is more simple and fast.

Description

Technical Field

[0001] This utility model relates to the field of photographic equipment technology, specifically to a self-locking mechanism and a telescopic tube. Background Technology

[0002] In many fields such as mechanical engineering, medical devices, surveying instruments, and industrial equipment, it is often necessary to reliably lock relatively sliding inner and outer tubular components in order to achieve functions such as length adjustment, position fixation, or quick disassembly.

[0003] However, the current method of adjusting and locking the expansion and contraction between differential diameter pipes is rather cumbersome and not flexible or convenient enough.

[0004] Therefore, there is an urgent need for a new type of self-locking mechanism that can conveniently and quickly achieve telescopic adjustment and locking. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] This utility model provides a self-locking mechanism and telescopic tube. The inner tube can be locked and released simply by rotating the outer wheel. It is flexible and convenient to operate and has a wider range of applications. It solves the technical problem that the telescopic tube is cumbersome to adjust and lock, and is inconvenient to operate.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a self-locking mechanism, comprising: an outer tube having a cavity for accommodating an inner tube; an inner tube coaxially sleeved within the outer tube, serving as the object for locking or releasing; a wedge assembly including a wedge disposed between the inner tube and the outer tube, the wedge passing through a wedge hole and having its inner cylindrical surface abutting against the outer wall of the inner tube, the wedge having a first outer conical surface; and an outer wheel, the lower end of the outer wheel having a first inclined surface formed on its inner wall oriented towards its axis, rotating the outer wheel causes the first inclined surface to act on the first outer conical surface, forcing the wedge to move radially to lock or release the inner tube.

[0009] In one possible implementation, a wedge hole is circumferentially provided at the front end of the outer tube. The wedge passes through the wedge hole and its inner cylindrical surface abuts against the outer wall of the inner tube. The self-locking mechanism further includes: an inner ring, sleeved inside the outer tube, with its lower end limited by the wedge and unable to move downward or rotate. The inner ring has an external thread, and the inner wall of the upper end of the outer wheel has an internal thread that mates with the external thread. When the outer wheel is rotated, since the inner ring is limited, when the outer wheel moves axially forward relative to the inner ring, the first inclined surface presses against the first outer conical surface of the wedge, driving the wedge to move synchronously radially inward to grip the inner tube.

[0010] In one possible implementation, a wedge hole is circumferentially formed at the front end of the outer tube. The wedge passes through the wedge hole and its inner cylindrical surface abuts against the outer wall of the inner tube. The top of the first outer conical surface has a helical inclined surface. The first inclined surface is adapted to the first outer conical surface, and there is also a helical step on the first inclined surface that cooperates with the helical inclined surface. By rotating the outer wheel, the wedge is acted in the opposite direction, so that the wedge moves radially to lock or release the inner tube.

[0011] In one possible implementation, a through groove is provided circumferentially at the front end of the outer tube to form an elastic locking part at the end of the outer tube. The inner wall of the lower end of the outer wheel also forms a second inclined surface that is inclined toward its axis. The second inclined surface is located below the first inclined surface. When the outer wheel is rotated, the wedge is forced to move radially. At the same time, the second inclined surface squeezes or moves away from the port of the front end of the outer tube, forcing the port to contract or open radially, thereby tightening or loosening the inner tube.

[0012] In one possible implementation, the lower end of the inner side of the inner ring is provided with a slope, which is adapted to the second outer conical surface of the wedge. When the outer wheel is rotated, the first slope presses against the first outer conical surface of the wedge to achieve a first locking, and the slope acts on the second outer conical surface to achieve a second locking.

[0013] In one possible implementation, one end of the outer wheel forms an inward buckle, and one end of the bushing has a raised edge on its outer wall. The bushing is engaged within the inward buckle by the raised edge to limit its position.

[0014] In one possible implementation, the wedge assembly includes at least two wedges that are circumferentially distributed among each other; and / or the outer conical surface of the wedge is adapted to the inclination angle of the first inclined surface of the outer wheel.

[0015] In one possible implementation, the self-locking mechanism further includes a bushing disposed between the inner wall of the outer tube and the outer wall of the inner tube; and / or the outer tube and the inner wall of the inner tube are further provided with anti-rotation ribs; and / or the outer wall of the end of the inner tube is further provided with an anti-slip plate.

[0016] In one possible implementation, one end of the outer wheel forms an inward buckle, and one end of the bushing has a raised edge on its outer wall. The bushing is engaged within the inward buckle by the raised edge to limit its position.

[0017] In one possible implementation, the outer tube and the inner tube are carbon fiber tubes.

[0018] To achieve the above objectives, the present invention further provides a solution: a telescopic tube is provided, the telescopic tube including at least one set of the above-mentioned self-locking mechanism.

[0019] (III) Beneficial Effects

[0020] Compared with the prior art, the present invention provides a self-locking mechanism and a telescopic tube, which have the following advantages:

[0021] A self-locking mechanism and a telescopic tube are disclosed. The self-locking mechanism includes an outer tube, an inner tube, a wedge block assembly, and an outer wheel. The outer tube has a wedge block hole circumferentially oriented to accommodate the wedge block. The inner inclined surface of the outer wheel engages with the outer conical surface of the wedge block, thereby utilizing the rotation of the outer wheel to exert a reverse force on the wedge block, causing the wedge block to move radially to lock or release the inner tube. Based on this structure, locking or releasing the inner tube can be achieved simply by rotating the outer wheel, making the operation more flexible and faster. Furthermore, the telescopic tube of this self-locking mechanism makes telescopic adjustment and locking even simpler and faster. Attached Figure Description

[0022] Figure 1 This is a first disassembly diagram of the self-locking mechanism in Embodiment 1;

[0023] Figure 2 This is a second disassembly diagram of the self-locking mechanism in Embodiment 1;

[0024] Figure 3 This is a schematic diagram of the overall structure of the self-locking mechanism in Embodiment 1;

[0025] Figure 4 yes Figure 3 A partial sectional view along section line aa in section A;

[0026] Figure 5 This is a schematic diagram of the overall structure of the outer wheel in Example 1;

[0027] Figure 6 This is a cross-sectional view of the outer wheel of Example 1;

[0028] Figure 7 This is a schematic diagram of the overall structure of the wedge block in Embodiment 1;

[0029] Figure 8 This is a schematic diagram of the overall structure of the bushing in Example 1.

[0030] Figure 9 This is a schematic diagram of the disassembled structure of the self-locking mechanism in Embodiment 2;

[0031] Figure 10 This is a schematic diagram of the overall structure of the self-locking mechanism in Embodiment 2;

[0032] Figure 11 yes Figure 10 A partial sectional view along section line aa in section A;

[0033] Figure 12 This is a cross-sectional view of the outer wheel of Example 2;

[0034] Figure 13 This is a schematic diagram of the overall structure of the inner ring in Example 2;

[0035] Figure 14 This is a partial sectional view of Example 3;

[0036] Figure 15 This is a schematic diagram of the overall structure of the wedge block assembly in Embodiment 3.

[0037] In the diagram: 1. Outer tube; 11. Through groove; 12. Wedge hole; 13. Lock hole; 2. Inner tube; 3. Wedge assembly; 31. Wedge; 32. First outer conical surface; 33. Helical inclined surface; 34. Inner cylindrical surface; 35. Second outer conical surface; 4. Inner ring; 41. External thread; 42. Slope; 5. Outer wheel; 51. First inclined surface; 511. Helical step; 52. Second inclined surface; 53. Internal thread; 54. Internal thread; 6. Bushing; 61. Protruding edge; 7. Anti-rotation rib; 8. Anti-slip plate; 9. Sealing ring. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] Example 1

[0040] Please see Figures 1-8 The diagram shows a structural schematic of the self-locking mechanism and its components in Embodiment 1. In this embodiment, the self-locking mechanism includes an outer tube 1 with a wedge hole 12 circumferentially opened at the front end of the outer tube 1 for accommodating a wedge 31; an inner tube 2, which is coaxially sleeved inside the outer tube 1 as the object to be locked or released; a wedge assembly 3, including a wedge 31 disposed between the inner tube 2 and the outer tube 1, the wedge 31 passing through the wedge hole 12 and its inner cylindrical surface 34 abutting against the outer wall of the inner tube 2, the wedge 31 having an outer conical surface 32; and an outer wheel 5, the lower end of the inner wall of the outer wheel 5 forming a first inclined surface 51 inclined towards its axis. When the outer wheel 5 is rotated, the first inclined surface 51 acts on the first outer conical surface 32, forcing the wedge 31 to move radially to lock or release the inner tube 2.

[0041] Based on the wedge's own structure, namely an inner cylindrical surface and an outer first conical surface, it can not only interact with the first inclined surface inside the outer wheel to lock the inner tube, but also serve as a connector to lock the outer wheel and the inner and outer tubes together without the need for other additional connectors, thus enabling quick installation between various operating components.

[0042] In one possible implementation, the top of the first outer conical surface 32 has a helical inclined surface 33, the first inclined surface 51 is adapted to the first outer conical surface 32, and the first inclined surface 51 also has a helical step 511 that cooperates with the helical inclined surface 33, so that the outer wheel 5 rotates and acts in the opposite direction on the wedge block 31, so that the wedge block 31 moves radially to lock or release the inner tube 2.

[0043] In this embodiment, the interaction between the outer wheel and the internal structure of the wedge allows the outer wheel to move in a first direction while simultaneously acting on the wedge to move in a second direction. This, in turn, through the interaction of the first inclined surface and the outer conical surface, compresses the internal pressure of the wedge, thus locking the inner tube. The first and second directions of movement are opposite.

[0044] For example, in one possible implementation, specifically, please participate Figure 4 As shown, when the outer wheel rotates, its spiral steps climb along the spiral ramp (specifically, the outer wheel moves upward relative to the wedge), which in turn reacts and squeezes the spiral ramp of the wedge downward (specifically, the wedge moves downward relative to the outer wheel). This causes the outer conical surface of the wedge to climb relative to the first ramp (based on the fact that the first ramp gradually widens from top to bottom as shown in the figure, while the outer conical surface narrows from top to bottom as shown in the figure), causing the wedge to generate an inward squeezing force, which presses against the outer wall of the inner tube to achieve locking.

[0045] In one possible implementation, the number of wedges 4 is at least two, and they are evenly distributed among each other. When there are multiple wedges, the corresponding structures inside the outer wheel that cooperate with them are also designed to work together to achieve the desired effect. The accompanying drawings in this specification illustrate the case with two wedges and are not intended to limit the specific number of wedges. When there are multiple wedges, the multiple wedges are evenly distributed among each other, so that when the outer wheel is in action, the multiple wedges can act on the inner tube from multiple relative directions to lock it in multiple directions, resulting in a more balanced force and a more stable and reliable locking effect.

[0046] In one possible implementation, a bushing 6 is provided between the outer wall of the inner tube 2 and the inner wall of the outer tube 1. Specifically, the bushing 6 can be made of soft metal, rubber or other soft materials. On the one hand, it can avoid excessive friction damage between the outer tube and the inner tube, and on the other hand, it can effectively prevent the inner tube 2 and the outer tube 1 from loosening and sliding.

[0047] The bushing 6 has symmetrical openings to facilitate its installation by fitting it onto the outer wall of the inner tube.

[0048] In one possible implementation, one end of the outer wheel 5 forms an inward buckle 54, and one end of the bushing 6 forms a protruding edge 61 on its outer wall, so as to engage with the bushing 6 within the inward buckle 54 through the protruding edge 61, thereby limiting the bushing 6 between the outer wall of the inner tube and the inner wall of the outer tube.

[0049] In one possible implementation, a sealing ring 9 is provided on the end of the outer wheel 5 relative to the outer tube 1. Specifically, the sealing ring is engaged with the upper end face of the spiral step 511 of the outer wheel. The sealing ring 9 effectively blocks and seals the tube, preventing rainwater, dust, and other contaminants from entering.

[0050] In one possible implementation, to further ensure the locking effect between the outer tube 1 and the inner tube 2, a locking hole 13 is provided at the end where the outer tube 1 and the inner tube 2 are connected, so that the inner tube 2 can be further locked by passing a locking screw through the locking hole 13 to prevent it from loosening and sliding.

[0051] In one possible implementation, to prevent the inner and outer tubes from rotating relative to each other, anti-rotation ribs 7 are provided on the inner walls of the outer tube 1 and the inner tube 2. The anti-rotation ribs prevent and limit relative axial rotation between the inner and outer tubes, and also provide some guidance during the expansion and contraction of the inner tube relative to the outer tube.

[0052] Example 2

[0053] Example 2 provides an alternative driving method for the outer wheel and wedge block compared to Example 1. Please refer to [link / reference]. Figures 9-13 The figure shows a schematic diagram of the self-locking mechanism and its various components according to Embodiment 2 of this utility model. As shown in the figure, the self-locking mechanism includes an outer tube 1, with a wedge hole 12 circumferentially opened at the front end of the outer tube 1 for accommodating a wedge 31; an inner tube 2, which is coaxially sleeved inside the outer tube 1 as the object to be locked or released; a wedge assembly 3, including a wedge 31 disposed between the inner tube 2 and the outer tube 1, the wedge 31 passing through the wedge hole 12 and its inner cylindrical surface 34 abutting against the outer wall of the inner tube 2, the wedge 31 having a first outer conical surface 32; and an outer wheel 5, with a first inclined surface 51 formed on the lower inner wall of the outer wheel 5, which is inclined toward its axis. When the outer wheel 5 is rotated, the first inclined surface 51 acts on the first outer conical surface 32, forcing the wedge 31 to move radially to lock or release the inner tube 2.

[0054] In one possible implementation, the self-locking mechanism further includes: an inner ring 4, which is fitted inside the outer tube 1 and whose lower end is limited by the wedge block 31 so that it cannot move downward or rotate; the inner ring 4 has an external thread 41; the inner wall of the upper end of the outer wheel 5 has an internal thread 52 that mates with the external thread 41; when the outer wheel 5 is rotated, since the inner ring 4 is restricted, when the outer wheel 5 moves forward axially relative to the inner ring 4, the first inclined surface 51 presses the first outer conical surface 32 of the wedge block 31, driving the wedge block 31 to move radially inward synchronously to hold the inner tube 2.

[0055] In this embodiment, the wedge block is also based on its own structure. Therefore, in addition to interacting with the inner structure of the outer wheel to lock the inner tube, it also acts as a connector between the outer wheel, the inner ring, and the inner and outer tubes, locking these operating components together without the need for additional connectors, thus enabling quick installation of the self-locking mechanism.

[0056] Furthermore, without increasing product costs, in order to achieve a double locking effect, in the self-locking mechanism of this utility model, the inner wall of the lower end of the outer wheel is further formed with a second inclined surface that is inclined toward its axis. The second inclined surface is located below the first inclined surface. When the second inclined surface acts on the outer conical surface of the wedge block at the same time as the first inclined surface, the second inclined surface acts on the front end of the outer tube, forcing the port of the front end of the outer tube to radially contract or open, thereby tightening or loosening the inner tube.

[0057] The following detailed description uses the self-locking mechanism of Embodiment 2 as an example. Please refer to [link / reference]. Figures 9-13 The self-locking mechanism shown includes an outer tube 1 with a through groove 11 circumferentially formed at its front end to create an elastic locking portion. A wedge hole 12 is also provided at the end of the outer tube 1. An inner tube 2 is coaxially fitted inside the outer tube 1, serving as the locking or releasing element. A wedge assembly 3 includes a wedge 31 positioned between the inner tube 2 and the outer tube 1, passing through the through hole 12 and having its inner cylindrical surface 34 abutting against the outer wall of the inner tube 2. An inner ring 4 is fitted inside the outer tube 1, its lower end limited by the wedge 31 to prevent downward movement and rotation, and has an external thread 41. An outer wheel 5... The upper inner wall of the outer wheel 5 has an internal thread 53 that mates with the external thread 41. The lower inner wall has a first inclined surface 51 and a second inclined surface 52 that are inclined toward its axis, with the second inclined surface 52 located below the first inclined surface 51. When the outer wheel 5 is rotated, the inner ring is restricted from moving. When the outer wheel 5 moves forward axially relative to the inner ring 4, the first inclined surface 51 presses against the first outer conical surface of the wedge block 31, driving the wedge block 31 to move radially inward synchronously to clamp the inner tube 2, achieving the first locking. The second inclined surface 52 presses against the end portion of the front end of the outer tube 1, forcing the end portion to contract radially inward, thereby clamping the inner tube 2, achieving the second locking. Conversely, synchronous loosening is achieved.

[0058] By using the first and second inclined surfaces inside the outer wheel, as the outer wheel rotates upward relative to the inner ring, the first and second inclined surfaces simultaneously squeeze the wedge and the outer tube, achieving a synchronous double locking effect without increasing product cost or design complexity.

[0059] In one possible implementation, the self-locking mechanism further includes a bushing 6, which is disposed between the inner wall of the outer tube 1 and the outer wall of the inner tube 2. Specifically, the bushing 6 can be made of soft metal, rubber, or other soft materials, which on the one hand avoids excessive friction damage between the outer tube and the inner tube, and on the other hand effectively prevents the inner tube and the outer tube from loosening and sliding.

[0060] In one possible implementation, the wedge component 3 includes at least two wedges 31, which are circumferentially distributed among each other.

[0061] In practical implementation, the number of wedges can be set based on the actual application scenario. To ensure even force distribution, the wedges are arranged in pairs and symmetrically. For example, when there are two wedges, they are placed on opposite sides of the outer wall of the inner tube. When there are multiple wedges, they are evenly distributed among each other. Correspondingly, there are also multiple through holes and multiple first inclined surfaces acting on the wedges. Thus, when the outer wheel rotates, multiple wedges can act on the inner tube from multiple relative directions to lock it in multiple directions, resulting in more balanced force distribution and a more stable and reliable locking effect.

[0062] In one possible implementation, the front end of the outer tube 1 has at least two through slots 11, which are symmetrically distributed circumferentially. The symmetrically distributed through slots allow the front end of the outer tube to have a larger retractable space, which can shrink inward evenly when compressed, so that the circumferential force on the clamped inner tube is uniform, and the locking is more stable and reliable.

[0063] In one possible implementation, the first outer conical surface of the wedge 31 is adapted to the inclination angle of the first inclined surface 51 of the outer wheel 5. This adaptation means that the mutually fitting inclined surfaces ensure uniform force distribution and a proper squeezing effect.

[0064] The self-locking mechanism of this invention uses carbon fiber tubes for both the outer tube 1 and the inner tube 2. Carbon fiber tubes are extremely lightweight, possess excellent specific strength / stiffness, and exhibit superior fatigue and corrosion resistance, while also possessing a certain degree of elasticity, further enhancing the effectiveness of the self-locking mechanism of this invention.

[0065] The self-locking mechanism of this utility model also has anti-rotation ribs 7 on the inner walls of the outer tube 1 and the inner tube 2. It can effectively prevent the inner tube and the outer tube from rotating relative to each other. By setting the anti-rotation ribs, the relative axial rotation between the inner tube and the outer tube can be limited, and it also has a certain guiding effect on the extension and contraction of the inner tube relative to the outer tube.

[0066] The self-locking mechanism of this invention also includes an anti-slip plate 8 on the outer wall of the inner tube 2. The anti-slip plate can prevent the inner tube from detaching from the outer tube due to excessive operation, thus ensuring the reliability of the overall product.

[0067] Example 3

[0068] This utility model also provides a self-locking mechanism for achieving self-locking. Embodiment 3 has the same structure as Embodiment 2 for achieving the first level of locking, except that in this embodiment, wedge holes are not required on the outer tube, thus reducing processing difficulty and product cost. The wedge assembly is embedded vertically between the outer and inner tubes through its own structure, while the inner ring is adhered to the outer tube with adhesive. The interaction between the inner ring and the outer wheel connects all components together. Furthermore, this embodiment provides another structural method for achieving the second level of locking. Other structures are the same as in Embodiment 2 and will not be described again here. For Embodiment 3, please refer to the appendix. Figure 14 The diagram shows a partial cross-sectional view of the self-locking mechanism in Example 3. The inner ring 4 has a slope 42 at the lower end of its inner side. The slope 42 is adapted to the second outer conical surface 35 of the wedge block 3. When the outer wheel 5 is rotated, the first inclined surface 51 presses the first outer conical surface 32 of the wedge block 31 to achieve the first locking. The slope 42 acts on the second outer conical surface 35 to achieve the second locking.

[0069] In this embodiment, the overall structural diagram of the wedge block assembly is shown below. Figure 15 As shown, the top conical ring is embedded between the outer tube and the inner tube. Each wedge can be independent of each other or combined to form an integrated wedge assembly with a shrinking function.

[0070] For details, please refer to the instruction manual appendix. Figure 14 When the outer wheel rotates, the inner ring is restricted from moving, causing the outer wheel to rotate. The first inclined surface generates a horizontal component force and a radial component force. The horizontal component force causes the wedge to move inward, while the axial component force pushes the wedge upward. Based on the effect of the slope, it also has a reaction effect, further squeezing the wedge to move inward. Therefore, the first inclined surface 51 and the slope 42 act on the wedge simultaneously. Through the synchronous action of the two inclined surfaces, the wedge is double-clamped, tightly holding the inner tube inside the wedge, achieving a double locking effect.

[0071] Based on the self-locking mechanism provided above, this utility model further provides a telescopic tube, which includes at least one set of the aforementioned self-locking mechanism. Such a telescopic tube offers simple, flexible, and quick telescopic adjustment and locking operations, and possesses greater locking force, ensuring the reliability and stability of locking after the tube has expanded or contracted. This allows it to be used in applications with higher safety and precision requirements.

[0072] It should be noted that the accompanying drawings of this utility model only illustrate the structure using one outer tube and one inner tube as an example. In reality, this structure is merely a minimum self-locking mechanism unit. In practical applications, the telescopic tube can be constructed from multiple such unit structures. That is, the inner tube in the accompanying drawings can be further fitted with another tube, and so on, so that a complete telescopic tube is formed by multiple inner and outer tubes of progressively smaller dimensions fitted together. In other words, the inner tube in the accompanying drawings can serve as the outer tube of the next telescopic tube unit, and so on.

[0073] The above detailed description of the self-locking mechanism and telescopic tube, in conjunction with the accompanying drawings, explains that the self-locking mechanism includes an outer tube, an inner tube, a wedge assembly, and an outer wheel. The outer tube has a wedge hole circumferentially oriented to accommodate the wedge. The inner inclined surface of the outer wheel engages with the outer conical surface of the wedge, thereby utilizing the rotation of the outer wheel to reverse the action on the wedge, causing the wedge to move radially to lock or release the inner tube. Based on this structure, locking or releasing the inner tube can be achieved simply by rotating the outer wheel, making operation more flexible and faster. Furthermore, the telescopic tube of this self-locking mechanism allows for simpler and faster adjustment and locking.

[0074] Furthermore, in the self-locking mechanism of this invention, a second inclined surface is formed on the inner wall of the lower end of the outer wheel, tilted towards its axis. This second inclined surface is located below the first inclined surface. Simultaneously, the second inclined surface acts on the outer conical surface of the wedge block while the first inclined surface acts on the front end of the outer tube, forcing the port portion of the outer tube to radially contract or open, thereby tightening or loosening the inner tube. Without increasing product costs, this mechanism achieves rapid locking simply by rotating the outer wheel, while also providing a dual locking effect on the pipe fitting. It simultaneously satisfies the pipe fitting locking force and the overall product strength. This self-locking mechanism can be further applied to telescopic pipes to meet application scenarios with higher safety and precision requirements.

[0075] Alternatively, in another embodiment, a slope is provided at the lower end of the inner wall of the inner ring. The first inclined surface of the outer wheel and the slope of the inner ring act synchronously on the wedge block, thereby achieving a synchronous double locking effect. This avoids drilling the tube body, reduces product production costs, and achieves a double locking effect.

[0076] The tubing is made of carbon fiber, which not only meets the requirements for lightweighting the product but also ensures the overall structural strength of the product. Furthermore, based on the characteristics of carbon fiber tubing, it has better elastic shrinkage force, ensuring a better locking effect.

[0077] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0078] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art 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 appended claims and their equivalents.

Claims

1. A self-locking mechanism, characterized in that, The self-locking mechanism includes: The outer tube has a cavity to accommodate the inner tube; The inner tube is coaxially sleeved inside the outer tube and serves as the object for locking or releasing. A wedge assembly includes a wedge disposed between the inner tube and the outer tube, wherein the inner cylindrical surface of the wedge abuts against the outer wall of the inner tube, and the wedge has a first outer conical surface; The outer wheel has a first inclined surface formed on its lower inner wall that is inclined toward its axis. When the outer wheel is rotated, the first inclined surface acts on the first outer conical surface, forcing the wedge to move radially to lock or release the inner tube.

2. The self-locking mechanism according to claim 1, characterized in that, The outer tube has a wedge hole circumferentially formed at its front end. The wedge passes through the wedge hole and its inner cylindrical surface abuts against the outer wall of the inner tube. The self-locking mechanism further includes: The inner ring is fitted inside the outer tube, and its lower end is limited by the wedge block so that it cannot move downward or rotate. The inner ring has an external thread, and the inner wall of the upper end of the outer wheel has an internal thread that mates with the external thread. When the outer wheel is rotated, the inner ring is restricted from moving. When the outer wheel moves forward axially relative to the inner ring, the first inclined surface presses against the first outer conical surface of the wedge block, driving the wedge block to move radially inward synchronously to grip the inner tube.

3. The self-locking mechanism according to claim 1, characterized in that, The outer tube has a wedge hole circumferentially opened at its front end. The wedge passes through the wedge hole and its inner cylindrical surface abuts against the outer wall of the inner tube. The top of the first outer conical surface has a helical inclined surface. The first inclined surface is adapted to the first outer conical surface, and there is also a helical step on the first inclined surface that cooperates with the helical inclined surface. By rotating the outer wheel, the helical step acts in the opposite direction on the wedge, so that the wedge moves radially to lock or release the inner tube.

4. The self-locking mechanism according to claim 2 or 3, characterized in that, The outer tube has a through groove circumferentially formed at its front end, so that the end of the outer tube forms an elastic locking part. The inner wall of the lower end of the outer wheel also forms a second inclined surface that is inclined toward its axis. The second inclined surface is located below the first inclined surface. When the outer wheel is rotated, the wedge is forced to move radially. At the same time, the second inclined surface squeezes or moves away from the port of the front end of the outer tube, forcing the port to contract or open radially, thereby tightening or loosening the inner tube.

5. The self-locking mechanism according to claim 2, characterized in that, The inner ring has a slope at its lower inner side. The slope is adapted to the second outer conical surface of the wedge. When the outer wheel is rotated, the first slope presses against the first outer conical surface of the wedge to achieve the first locking. The slope acts on the second outer conical surface to achieve the second locking.

6. The self-locking mechanism according to claim 1, characterized in that, The wedge assembly includes at least two wedges that are circumferentially distributed among each other; and / or the outer conical surface of the wedge is adapted to the inclination angle of the first inclined surface of the outer wheel.

7. The self-locking mechanism according to claim 1, characterized in that, The self-locking mechanism further includes a bushing disposed between the inner wall of the outer tube and the outer wall of the inner tube; and / or the outer tube and the inner wall of the inner tube are further provided with anti-rotation ribs; and / or the outer wall of the end of the inner tube is further provided with an anti-slip plate.

8. The self-locking mechanism according to claim 7, characterized in that, One end of the outer wheel forms an inward buckle, and one end of the bushing has a raised edge on its outer wall. The bushing is engaged within the inward buckle by the raised edge to limit its position.

9. The self-locking mechanism according to claim 1, wherein the outer tube and the inner tube are carbon fiber tubes.

10. A telescopic tube, characterized in that, The telescopic tube includes at least one set of self-locking mechanisms as described in any one of claims 1-9.

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