Telescopic locking mechanism

Abstract

The utility model relates to the field of mechanical engineering and fitness equipment, in particular to a telescopic locking mechanism which comprises a shell. The center pin is arranged in the shell, a slope structure is arranged on the center pin, and the input end of the center pin extends out of a first through hole in the side wall of the shell; the abutting rods are distributed on the side face of the center pin, and the inner ends of the abutting rods make contact with the slope structure; the center pin is sleeved with the first spring, and the two ends of the first spring abut against the center pin and the inner wall of the shell respectively; the second spring is connected with the abutting rod and used for driving the abutting rod to be close to the center pin. When external force acts on the input end of the center pin, the center pin moves in the axial direction, the abutting rod is driven by the slope structure to stretch out and draw back in the radial direction, and the outer end of the abutting rod is made to stretch out or draw back from the second through hole in the side wall of the shell. The scheme has the advantages that assembly is simplified, maintenance cost is reduced, and reliability and operation convenience are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical engineering and fitness equipment field especially, a telescopic locking mechanism. BACKGROUND

[0002] In the field of mechanical engineering and fitness equipment, telescopic locking mechanism is widely used in the device such as column, support and the like needing height adjustment and position fixation. The traditional telescopic locking structure usually adopts spring pin, bolt locking or split type locking assembly, for example, in the telescopic device of column, locking is realized by spring pin insertion into the positioning hole of different height. Although this kind of scheme can realize basic function, there are the following significant defects in actual application:

[0003] Non-integrated design leads to complicated assembly: the existing spring pin locking structure usually needs to install spring, pin shaft and matching fixing piece directly in the device, and the components are arranged dispersedly. For example, spring needs to be embedded in the inner wall of column separately, and pin shaft needs to be fixed by bolt or buckle. This non-integrated design leads to complex assembly process, long time consumption, and high requirement for installation precision, and slight carelessness can easily lead to component misplacement or spring failure.

[0004] Maintenance difficulty and high cost: when spring pin or locking component wears or is damaged, the whole device needs to be disassembled to replace parts. For example, replacing the failed spring needs to dismount the column shell and separate the relevant structure layer by layer, which not only consumes time and effort, but also can aggravate the wear of other components due to repeated disassembly and assembly. In addition, the dispersed parts increase the spare part management cost.

[0005] Reliability is limited and operation experience is poor: non-integrated spring pin relies on the cooperative work of multiple components, and after long-term use, locking failure can be caused by spring fatigue, pin shaft loosening or positioning hole wear. At the same time, the user needs to manually align the pin hole when adjusting, which is not convenient to operate, especially in the scene of frequent telescoping, which can easily reduce efficiency.

[0006] In view of the above problems, the prior art needs to be improved. SUMMARY

[0007] In order to solve the above problems, the utility model aims at providing a telescopic locking mechanism, which has the advantages of simplifying assembly, reducing maintenance cost, improving reliability and operation convenience.

[0008] In order to realize the above purpose, the utility model adopts the following technical scheme:

[0009] The application provides a telescopic locking mechanism, and the technical scheme is as follows: a telescopic locking mechanism, comprising: a shell; a center pin arranged in the shell, wherein a slope structure is arranged on the center pin, and an input end of the slope structure extends out of a first through hole in a side wall of the shell; a resisting rod distributed on a side of the center pin, wherein an inner end of the resisting rod is in contact with the slope structure; a first spring sleeved on the center pin, wherein two ends of the first spring are respectively in contact with the center pin and an inner wall of the shell; and a second spring connected with the resisting rod, used for driving the resisting rod to move towards the center pin; when an external force acts on the input end of the center pin, the center pin moves axially, the resisting rod is driven to extend or retract radially through the slope structure, and an outer end of the resisting rod extends out of or retracts into a second through hole in the side wall of the shell.

[0010] Further, the application further provides that the center pin is provided with a step structure, one end of the first spring is in contact with the step structure, and the other end of the first spring is in contact with the inner wall of the shell.

[0011] Further, the application further provides that the number of the resisting rods is two, and the resisting rods are symmetrically distributed on two sides of the center pin.

[0012] Further, the application further provides that the shell is internally provided with a first channel and a second channel intersecting with each other, the first channel extends axially along the shell, and the second channel extends radially along the shell; the side wall of the shell is provided with the first through hole communicated with an end of the first channel and the second through hole communicated with an end of the second channel; the center pin and the first spring are arranged in the first channel, and the resisting rod and the second spring are arranged in the second channel.

[0013] Further, the application further provides that the slope structure is a variable-diameter conical surface constructed on the center pin, and the inner end of the resisting rod is in circular-arc shape and is in sliding fit with the variable-diameter conical surface.

[0014] Further, the application further provides that the shell is provided with a mounting through hole at the other end of the first channel, and the center pin and the first spring can be loaded into or unloaded from the first channel through the mounting through hole.

[0015] Further, the application further provides that the side wall of the shell is formed with an opening on one side of the second channel, and the shell is provided with a cover plate capable of covering the opening.

[0016] Further, the application further provides that the side wall of the shell is constructed with a positioning step arranged in a circumferential direction of the shell, and the second through hole is arranged on the side wall of the shell outside the positioning step.

[0017] From the above, the telescopic locking mechanism and the shell, the center pin, the resistance rod, the spring and the slope structure thereof provided by the application simplify the assembly process, reduce the maintenance cost, improve the reliability and operation convenience of the device, and have significant practical value. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 A perspective view of the telescopic locking mechanism provided by the application.

[0019] Fig. 2 An exploded view of the structure of the telescopic locking mechanism provided by the application.

[0020] Fig. 3 A sectional view of the structure of the telescopic locking mechanism provided by the application. DETAILED DESCRIPTION

[0021] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0022] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0023] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more, unless otherwise explicitly limited.

[0024] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connect;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can through intermediate medium indirectly connect, can be two element inside intercommunication.For the ordinary skill in the art, can understand the concrete meaning of the above terms in the utility model according to specific circumstances.

[0025] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features directly contact, also can include the first and second features are not directly contact but contact through another feature between them.Moreover, the first feature is "on", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0026] As shown in Figs. 1-3 The utility model relates to a telescopic locking mechanism, including shell 19, center pin 20, abutment rod 21, first spring 22 and second spring 23.Center pin 20 is arranged in shell 19, is provided with ramp structure 24 on it, and input end extends from the first through hole 27 of shell 19 lateral wall.Abutment rod 21 is distributed in the side of center pin 20, and the inner end portion thereof is in contact with ramp structure 24.First spring 22 is sleeved on center pin 20, and both ends are respectively abutted with center pin 20 and the inner wall of shell 19.Second spring 23 is connected abutment rod 21, for driving abutment rod 21 to close to center pin 20.When external force (such as pulling cable 5) acts on the input end of center pin 20, center pin 20 moves axially, drives abutment rod 21 to radially telescopic through ramp structure 24, makes the outer end portion of abutment rod 21 extend from the second through hole 28 of shell 19 lateral wall or retract.

[0027] Specifically, the shell 19 regulates the movement direction of the center pin 20 and the abutting rod 21, and the contact design of the slope structure 24 of the center pin 20 and the abutting rod 21 makes the axial movement of the center pin 20 able to drive the radial expansion and contraction of the abutting rod 21, so as to realize locking or unlocking. The cooperation of the first spring 22 and the second spring 23 ensures the stability and reset function of the center pin 20 and the abutting rod 21 during operation. The scheme integrates the center pin 20, the abutting rod 21, the first spring 22 and the second spring 23 inside the shell 19, and the overall design simplifies the structure, improves the convenience and reliability of operation. As a whole piece, the telescopic locking mechanism can be directly installed in the corresponding position after assembly, which can improve the assembly efficiency. When maintaining, the entire telescopic locking mechanism can be replaced separately, which is simple to maintain and reduces costs. Therefore, the technical scheme of the present application realizes the reliable expansion and contraction and locking of the telescopic locking mechanism through the synergistic effect of the center pin 20, the abutting rod 21, the first spring 22 and the second spring 23. Compared with the prior art, the present scheme has the advantages of simple structure, convenient operation, easy maintenance and the like, and can effectively solve the problems of complicated assembly, difficult maintenance and limited reliability of the traditional telescopic locking mechanism.

[0028] In specific embodiments, the center pin 20 is provided with a step structure, one end of the first spring 22 abuts against the step structure, and the other end abuts against the inner wall of the shell 19. The step structure can be designed as an annular protrusion, a local protrusion or other forms of protrusion structure to ensure the stable position of the first spring 22 on the center pin 20. The height and width of the step structure can be adjusted according to the size and stress condition of the spring to provide sufficient support force. The other end of the first spring 22 abuts against the inner wall of the shell 19, which can be further enhanced by setting corresponding grooves or protrusions on the inner wall of the shell 19. Through the cooperation of the step structure and the inner wall of the shell 19, the first spring 22 can maintain a stable position on the center pin 20, thereby ensuring the reliability and stability of the entire telescopic locking mechanism. The step structure provides a fixed support point for the first spring 22, preventing the spring from shifting or falling off under stress. Compared with the prior art, this technical scheme simplifies the fixing method of the spring, reduces the assembly process, improves the installation precision and maintenance convenience. At the same time, through the cooperation of the step structure and the inner wall of the shell 19, it is ensured that the spring can effectively play a role in the axial movement process on the center pin 20, thereby improving the reliability and stability of the entire telescopic locking mechanism.

[0029] In a further refined scheme, the number of abutting rods 21 is two, symmetrically distributed on both sides of the central pin 20. This design ensures that the abutting rods 21 can be uniformly stressed when the central pin 20 moves axially, thereby avoiding the problem of unstable locking caused by uneven distribution of the abutting rods 21. The symmetric distribution of the two abutting rods 21 enables the central pin 20 to drive the abutting rods 21 to radially expand and contract in balance when stressed, improving the reliability and stability of the locking. Compared with the prior art, the technical scheme of the present application has higher locking reliability and stability, and can effectively solve the problem of unstable locking caused by uneven distribution of the abutting rods 21 in the traditional telescopic locking mechanism.

[0030] In a specific embodiment, the housing 19 is internally provided with a first channel 25 and a second channel 26 intersecting each other, the first channel 25 extending axially along the housing 19, and the second channel 26 extending radially along the housing 19; the housing 19 has a first through-hole 27 communicating with the end of the first channel 25, and a second through-hole 28 communicating with the end of the second channel 26; the central pin 20 and the first spring 22 are arranged in the first channel 25, and the abutting rod 21 and the second spring 23 are arranged in the second channel 26. Specifically, the intersecting design of the first channel 25 and the second channel 26 can be realized in various ways. For example, the first channel 25 can be designed as an axial through-hole penetrating the housing 19, and the second channel 26 is designed as a radial through-hole intersecting the first channel 25 perpendicularly. The first through-hole 27 and the second through-hole 28 can be located on different side walls of the housing 19, so that the central pin 20 and the abutting rod 21 can smoothly extend or retract. In addition, the sizes of the first channel 25 and the second channel 26 can be optimized according to the sizes of the central pin 20, the abutting rod 21, the first spring 22 and the second spring 23, to ensure that the components can be smoothly installed and moved. Thus, by arranging the first channel 25 and the second channel 26 intersecting each other inside the housing 19, the central pin 20 and the first spring 22 can be arranged in the first channel 25 axially, while the abutting rod 21 and the second spring 23 are arranged in the second channel 26 radially. This design simplifies the internal structure of the housing 19, making it easier to install the components. The arrangement of the first through-hole 27 and the second through-hole 28 standardizes the movement direction of the central pin 20 and the abutting rod 21, and the central pin 20 and the abutting rod 21 can more smoothly extend or retract from the side wall of the housing 19, thereby realizing the telescopic locking function. Through this structure, the components inside the housing 19 are arranged more reasonably, reducing the complexity of assembly and improving the installation efficiency.

[0031] Further, the slope structure 24 is a variable-diameter tapered surface constructed on the center pin 20, and the inner end of the abutting rod 21 is a circular arc end 30 that is in sliding cooperation with the variable-diameter tapered surface. The variable-diameter tapered surface refers to a tapered surface whose diameter gradually changes along the axial direction. This design allows the center pin 20 to drive the abutting rod 21 to expand and contract radially when the center pin 20 moves axially. The inner end of the abutting rod 21 is a circular arc end 30, which can achieve good sliding cooperation with the variable-diameter tapered surface, reducing friction and wear, and ensuring the smoothness and stability of the abutting rod 21 during expansion and contraction. As a preferred embodiment, the taper angle of the variable-diameter tapered surface can be adjusted according to actual application requirements. For example, a smaller taper angle can be used when a larger radial displacement is required, and a larger taper angle can be used when a smaller radial displacement is required. In addition, the radius of the circular arc end of the abutting rod 21 can also be optimized according to the curvature of the variable-diameter tapered surface to further reduce contact stress and improve the smoothness of sliding cooperation. Thus, the problem of poor cooperation between the abutting rod 21 and the center pin 20 in the traditional expansion and locking mechanism is solved, and the reliability and operation smoothness of the mechanism are improved. Compared with the prior art, the technical solution of the present application has significant advantages, such as effectively reducing friction and wear, prolonging the service life of the mechanism, and improving the smoothness and reliability of operation.

[0032] Further, the housing 19 is provided with a mounting through hole 31 at the other end of the first channel 25, and the center pin 20 and the first spring 22 can be installed or removed from the first channel 25 through the mounting through hole 31. Specifically, the design of the mounting through hole 31 makes the installation and removal process of the center pin 20 and the first spring 22 more convenient. As a preferred embodiment, the mounting through hole 31 can be designed as a circle or an ellipse to facilitate the smooth passage of the center pin 20 and the first spring 22. In addition, the size of the mounting through hole 31 can be adjusted according to the size of the center pin 20 and the first spring 22 to ensure the smoothness of installation and removal. In this regard, the housing 19 is provided with a mounting through hole 31 at the other end of the first channel 25, which simplifies the installation and removal process of the center pin 20 and the first spring 22. Through the mounting through hole 31, the center pin 20 and the first spring 22 can be conveniently installed or removed from the first channel 25, thereby improving the convenience of maintenance. Compared with the prior art, this technical solution avoids the cumbersome steps of disassembling the entire device to replace parts in the traditional structure, significantly reducing maintenance time and cost. Specifically, the presence of the mounting through hole 31 makes the replacement of the center pin 20 and the first spring 22 more efficient, reducing the wear of parts caused by repeated disassembly and assembly, and further improving the reliability and service life of the device.

[0033] Further, the side wall of the shell 19 is formed with an opening on one side of the second channel 26, and a cover plate 32 is arranged on the shell 19 and can cover the opening. The opening is designed to facilitate the installation and maintenance of the internal components, especially the installation and maintenance of the stopper 21 and the second spring 23 in the second channel 26. The design of the cover plate 32 ensures the structural integrity of the shell 19 and prevents external impurities from entering the interior of the shell 19. The detachable design of the cover plate 32 also facilitates subsequent maintenance and repair work. Specifically, the opening can be designed in a rectangular, circular or other suitable shape to facilitate the installation and removal of internal components. The cover plate 32 can be fixed on the opening by screws, buckles or other connection methods to ensure its stability and sealing. Through the above technical solution, the side wall of the shell 19 is formed with an opening on one side of the second channel 26, and the opening is covered by the cover plate 32, effectively solving the problem of structural integrity and maintenance convenience after the opening of the shell 19. This design not only simplifies the installation and maintenance process of internal components, but also improves the overall reliability and service life of the shell 19. Compared with the prior art, this scheme realizes efficient maintenance and repair through simple structural design, and has significant technical advantages.

[0034] Further as shown in Figs. 1-3 The side wall of the shell 19 is formed with a positioning step 33 arranged along the circumference thereof, and the second through hole 28 is arranged on the side wall of the shell outside the positioning step 33. The positioning step 33 can be formed by machining an annular protrusion or groove on the side wall of the shell 19, and can be machined by turning, milling or casting. The outer side of the positioning step 33 can be designed as a flat surface, an inclined surface or an arc surface to adapt to different connection requirements. Through the above technical solution, the formation of the positioning step 33 enables the side wall of the shell 19 to have a connection platform for external connection, for example, in a treadmill stand, it can be sleeved with the bottom of the stand pipe, thereby facilitating positioning and fixing. The second through hole 28 is arranged on the side wall of the shell outside the positioning step 33, which ensures that the connection structure does not affect the extension and retraction of the stopper 21, thereby improving the reliability and operation convenience of the telescopic locking mechanism. Compared with the prior art, this technical solution simplifies the installation process through integrated design, improves the maintenance convenience, and ensures the reliability of the locking and the fluency of the operation.

[0035] Therefore, through the integrated and modular design, the technical problems of the traditional telescopic locking mechanism, such as complicated assembly, difficult maintenance and limited reliability, are solved. The pre-assembly design of the center pin 20 and the stopper 21 not only simplifies the installation process, but also improves the maintenance convenience. At the same time, the arrangement of the first through hole 27 and the second through hole 28 ensures the reliability of the locking, so that this technical solution has significant advantages in practical application.

[0036] The use process of the telescopic locking mechanism is as follows:

[0037] When an external force is applied to the input end of the center pin 20, the center pin 20 is driven to move upward, and a slope structure 24 is designed on the center pin 20, the center pin 20 moves upward, the first spring 22 is compressed, and the two side abutting rods 21 are closed to the center under the action of the second spring 23, until the outer end of the abutting rod 21 is retracted from the second through hole 28 of the side wall of the shell 19, and the unlocking is realized.

[0038] After the external force is removed, the center pin 20 is reset to move downward under the action of the first spring 22, the slope structure 24 on the center pin 20 drives the two side abutting rods 21 to press out at the same time the second spring 23 is compressed, until the outer end of the abutting rod 21 is extended from the second through hole 28 of the side wall of the shell 19, and the locking is realized.

[0039] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0040] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present application without departing from the principles and purposes of the present application.

Claims

1. A telescoping locking mechanism characterized by, The utility model relates to a telescopic locking mechanism, comprising: a housing (19); a center pin (20) arranged in the housing (19), the center pin (20) being provided with a ramp structure (24) on the input end of which a first through hole (27) of the side wall of the housing (19) extends; a contact rod (21) arranged on the side of the center pin (20), the inner end of the contact rod (21) being in contact with the ramp structure (24); a first spring (22) sleeved on the center pin (20), the two ends of the first spring (22) being in contact with the center pin (20) and the inner wall of the housing (19) respectively; a second spring (23) connected to the contact rod (21) and used for driving the contact rod (21) to move towards the center pin (20); wherein when an external force acts on the input end of the center pin (20), the center pin (20) moves axially, the contact rod (21) is driven to expand or contract radially through the ramp structure (24), and the outer end of the contact rod (21) extends out of or retracts into the second through hole (28) of the side wall of the housing (19).

2. The telescopic locking mechanism according to claim 1, wherein: the center pin (20) is provided with a step structure, one end of the first spring (22) is in contact with the step structure, and the other end of the first spring (22) is in contact with the inner wall of the housing (19).

3. The telescopic locking mechanism according to claim 1, wherein: the number of the contact rods (21) is two, and the two contact rods (21) are symmetrically arranged on the two sides of the center pin (20).

4. The telescopic locking mechanism according to claim 1, wherein: the housing (19) is internally provided with a first channel (25) and a second channel (26) intersecting with each other, the first channel (25) extends along the axis of the housing, and the second channel (26) extends along the radial direction of the housing; the side wall of the housing (19) is provided with a first through hole (27) communicating with the end of the first channel (25) and a second through hole (28) communicating with the end of the second channel (26); the center pin (20) and the first spring (22) are arranged in the first channel (25), and the contact rod (21) and the second spring (23) are arranged in the second channel (26).

5. The telescopic locking mechanism according to claim 1, wherein: the ramp structure (24) is a variable-diameter tapered surface formed on the center pin (20), and the inner end of the contact rod (21) is a circular arc end (30) in sliding fit with the variable-diameter tapered surface.

6. The telescopic locking mechanism according to claim 4, wherein: the housing (19) is provided with a mounting through hole (31) at the other end of the first channel (25), and the center pin (20) and the first spring (22) can be loaded into or unloaded from the first channel (25) through the mounting through hole (31).

7. The telescopic locking mechanism according to claim 4, wherein: the side wall of the housing (19) is formed with an opening on one side of the second channel (26), and the housing (19) is provided with a cover plate (32) capable of covering the opening.

8. The telescopic locking mechanism according to claim 4, wherein: The shell (19) side wall is constructed with a positioning step (33) arranged along the circumference thereof, and the second through hole (28) is arranged on the shell side wall outside the positioning step (33).

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