Telescopic limiting structure

Abstract

The utility model relates to a telescopic limiting structure which comprises a first shell and a second shell, a rolling assembly is arranged in the first shell, a limiting assembly is arranged on the inner side of the second shell, the rolling assembly protrudes out of the first shell and makes contact with the limiting assembly, and the first shell is connected in the second shell in a sliding mode through the rolling assembly and the limiting assembly. The rolling assembly moves on the limiting assembly to drive the first shell to move in the second shell in a telescopic mode. Through the arrangement of the rolling assembly and the limiting assembly, a ball rolls in a movable cavity, so that the ball moves from one clamping groove to the next clamping groove along an elastic sliding groove, the first shell is driven to be limited at different gears in the second shell, and rapid stretching and retracting are achieved through a simple structure; by arranging the ball, the movable cavity, the round hole, the through hole, the limiting column and the limiting groove, the base, the ball, the first shell and the second shell can be sequentially installed, simple assembling and rapid assembling are achieved, and the assembling complexity is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical structures, in particular to a telescopic limiting structure. Background Art

[0002] A telescopic limiter is a mechanical structure capable of expanding and contracting within a specific range. This structure typically consists of multiple movable parts, enabling length or volume adjustment within certain limits. In modern machinery, these structures are widely used in a variety of devices and products, aiming to provide flexible spatial adjustments and functional expansion. However, many current telescopic limiters still have a number of limitations in practical applications, impacting their performance and user experience.

[0003] First, many telescopic limit structures in the existing technology cannot achieve rapid extension and retraction, which is mainly because their internal design usually adopts multi-stage slide rails, hinges or complex mechanical connection systems. Such a design requires a certain amount of time to complete the docking and movement of various components during operation, which causes the entire extension process to become slow, resulting in the stretching and contraction response speed being not sensitive enough; secondly, the designs of many existing telescopic limit structures often involve multiple movable parts and connection mechanisms. These parts need to be precisely aligned and fixed during assembly. Due to the complexity of the design, assemblers often need to use special tools and equipment, which increases the time and difficulty of assembly, increases the complexity of assembly, makes the telescopic limit structure inconvenient to assemble, reduces operability, and affects the overall use effect. Utility Model Content

[0004] Based on this, it is necessary to provide a telescopic limiting structure to address the problem that existing telescopic limiting structures are difficult to achieve rapid telescoping and convenient assembly.

[0005] A telescopic limiting structure, comprising:

[0006] A first shell and a second shell, a rolling assembly is provided inside the first shell, and a limiting assembly is provided on the inner side of the second shell, the rolling assembly protrudes from the outside of the first shell and contacts the limiting assembly, the first shell is slidingly connected in the second shell through the rolling assembly and the limiting assembly, the rolling assembly moves on the limiting assembly, driving the first shell to telescopically move inside the second shell.

[0007] In one embodiment, through holes are formed on both side walls of the first shell, and positioning grooves are provided in the first shell inside the through holes.

[0008] In one embodiment, the through hole includes a first through hole and a second through hole, the first through hole is arranged on the outer wall of the first shell, the second through hole is arranged on the inner wall of the first shell, the area of the second through hole is larger than the area of the first through hole, and the first through hole gradually expands toward the second through hole.

[0009] In one embodiment, the rolling assembly includes a base, which is arranged on the positioning groove, and an active cavity is provided inside the base. A circular hole is opened on the side of the base close to the through hole, and the area of the circular hole is larger than the area of the second through hole, and the active cavity is communicated with the circular hole.

[0010] In one embodiment, the movable cavity includes a first cavity and a second cavity, the first cavity is configured to be hemispherical, the second cavity is configured to be cylindrical, one end of the second cavity is connected to the first cavity, and the other end is connected to the circular hole, and the cross-sectional areas of the first cavity and the second cavity are equal to the area of the circular hole.

[0011] In one embodiment, the rolling assembly further includes a ball, which is disposed in the movable cavity, wherein the ball diameter is smaller than the first cavity diameter, the ball diameter is equal to the second through hole diameter, the ball diameter is larger than the first through hole diameter, the ball diameter is larger than the farthest distance from the second cavity to the circular hole, and the portion of the ball protruding from the movable cavity passes through the circular hole and the through hole, and protrudes from the outer wall of the first shell.

[0012] In one embodiment, the balls are made of steel.

[0013] In one embodiment, the limiting assembly includes a slide groove, and at least two groups of card slots are evenly spaced in the slide groove. The connecting surface between the card slot and the slide groove is set as an arc surface, and the card slot matches the protruding part of the ball.

[0014] In one embodiment, the limiting component is made of POM material.

[0015] In one embodiment, a limiting sleeve is further provided inside the first shell, and both ends of the limiting sleeve are fixedly connected to limiting columns, and two groups of the limiting columns respectively pass through and protrude from the top and bottom of the first shell; corresponding limiting grooves are opened in the middle of the top and bottom of the second shell, and the limiting grooves are slidably connected to the limiting columns, and the length of the limiting grooves is equal to the length of the sliding groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The utility model provides a rolling assembly and a limiting assembly, and utilizes a ball to roll in an active cavity, so that the ball moves from one slot to the next slot along a sliding groove made of elastic POM material, driving the first shell to limit different gears in the second shell, and realizing rapid extension and retraction with a simple structure; by providing balls, active cavities, round holes and through holes, as well as limiting columns and limiting grooves with corresponding proportions, the base, balls, first shell and second shell can be installed in sequence, realizing simple and rapid assembly, reducing the complexity of assembly, improving operability, and making the telescopic limiting structure easy to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the internal structure of a telescopic limiting structure;

[0019] Figure 2 It is a top view of a telescopic limiting structure;

[0020] Figure 3 It is a partial structural diagram of a telescopic limiting structure;

[0021] Figure 4 for Figure 3 Cross-section view at AA in the middle.

[0022] The corresponding relationship between the reference numerals and component names is as follows:

[0023] 1. First shell; 2. Second shell; 3. Rolling assembly; 4. Limiting assembly; 5. Through hole; 6. Positioning groove; 7. First through hole; 8. Second through hole; 9. Base; 10. Movable cavity; 11. Round hole; 12. First cavity; 13. Second cavity; 14. Ball; 15. Slide groove; 16. Card slot; 17. Limiting sleeve; 18. Limiting column; 19. Limiting groove. DETAILED DESCRIPTION

[0024] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0026] Some embodiments of the present invention are described below with reference to the accompanying drawings.

[0027] like Figures 1 to 4As shown, this embodiment discloses a telescopic limiting structure, including: a first shell 1 and a second shell 2, a rolling assembly 3 is provided inside the first shell 1, and a limiting assembly 4 is provided on the inner side of the second shell 2, the rolling assembly 3 protrudes from the outside of the first shell 1 and contacts the limiting assembly 4, the first shell 1 is slidingly connected in the second shell 2 through the rolling assembly 3 and the limiting assembly 4, the rolling assembly 3 moves on the limiting assembly 4, driving the first shell 1 to telescopically move inside the second shell 2.

[0028] The utility model sets a rolling component 3 and a limiting component 4, and uses the ball 14 to roll in the active cavity 10, so that the ball 14 moves from one slot 16 along the elastic slide groove 15 to the next slot 16, driving the first shell 1 to limit different gears in the second shell 2, and realizing rapid telescopic extension with a simple structure; by setting the ball 14, active cavity 10, circular hole 11 and through hole 5, as well as the limiting column 18 and the limiting groove 19 with corresponding proportions, the base 9, the ball 14, the first shell 1 and the second shell 2 can be installed in sequence, realizing simple and quick assembly, reducing the complexity of assembly, improving operability, and making the telescopic limiting structure easy to assemble.

[0029] In one embodiment, through holes 5 are formed on both side walls of the first housing 1 to provide rolling space for the rolling assembly 3. Positioning slots 6 are provided within the first housing 1 within the inner side of the through holes 5 to position and install the rolling assembly 3. The through holes 5 include a first through hole 7 and a second through hole 8. The first through hole 7 is provided on the outer wall of the first housing 1, and the second through hole 8 is provided on the inner wall of the first housing 1. The area of the second through hole 8 is larger than that of the first through hole 7. The first through hole 7 gradually expands toward the second through hole 8, resulting in the through hole 5 having an inclined surface that accommodates the arc surface of the ball 14.

[0030] In one embodiment, the rolling assembly 3 includes a base 9, which is arranged on the positioning groove 6. The base 9 is provided with an active cavity 10 inside. The active cavity 10 is used to provide rolling space for the ball 14. The base 9 is provided with a circular hole 11 on the side close to the through hole 5. The area of the circular hole 11 is larger than the area of the second through hole 8. The active cavity 10 is connected to the circular hole 11. The active cavity 10 includes a first cavity 12 and a second cavity 13. The first cavity 12 is configured as a hemispherical shape, and the second cavity 13 is configured as a cylindrical shape. One end of the second cavity 13 is connected to the first cavity 12, and the other end is connected to the circular hole 11. The cross-sectional areas of the first cavity 12 and the second cavity 13 are both equal to the area of the circular hole 11, which is used to facilitate the assembly of the rolling assembly 3.

[0031] In one embodiment, the rolling assembly 3 also includes a ball 14, which is arranged in the active cavity 10. The diameter of the ball 14 is slightly smaller than the diameter of the first cavity 12, providing the ball 14 with sufficient rolling space while limiting the rolling range of the ball 14. The diameter of the ball 14 is equal to the diameter of the second through hole 8, and the diameter of the ball 14 is larger than the diameter of the first through hole 7. The first through hole 7 limits the movement of the ball 14, so that the ball 14 rolls within a limited range without generating relative displacement. The diameter of the ball 14 is larger than the farthest distance from the second cavity 13 to the circular hole 11. The part of the ball 14 protruding from the active cavity 10 passes through the circular hole 11 and the through hole 5, and protrudes from the outer wall of the first shell 1. The volume of the protruding part of the ball 14 is at least less than half of the overall volume of the ball 14, that is, the protruding part of the ball 14 does not exceed half of itself, and the small protruding part of the ball 14 is used to provide external force to make it roll.

[0032] In one embodiment, the ball 14 is made of steel. The steel ball 14 has a high hardness and is not easily deformed, so it maintains a round shape, improves rolling smoothness, is not easily stuck, and achieves rapid expansion and contraction.

[0033] In one embodiment, the limiting component 4 includes a slide groove 15, and at least two groups of card grooves 16 are evenly spaced in the slide groove 15. The connecting surface between the card groove 16 and the slide groove 15 is set to an arc surface, which can improve the rolling smoothness of the ball 14 in the slide groove 15. The card groove 16 matches the protruding part of the ball 14, and the ball 14 is limited and engaged in the card groove 16. During expansion and contraction, the ball 14 squeezes the slide groove 15, and the slide groove 15 produces elastic deformation, so that the ball 14 follows the slide groove 15 to reach the next card groove 16, performing different expansion and contraction limits.

[0034] In one embodiment, the limit component 4 is made of POM material, polyformaldehyde, also known as acetal resin, polyoxymethylene, polyacetal, which is a thermoplastic crystalline polymer. POM is a tough and elastic material that has excellent creep resistance, geometric stability and impact resistance even at low temperatures; therefore, POM is applied to the slide groove 15, so that the steel ball 14 rolls in the elastic slide groove 15, driving the relative movement of the first shell 1 and the second shell 2 to achieve telescopic limit.

[0035] In one embodiment, a limiting sleeve 17 is further provided within the first housing 1, with limiting posts 18 fixedly connected at both ends. Two sets of limiting posts 18 extend through and protrude from the top and bottom of the first housing 1, respectively. Corresponding limiting slots 19 are defined in the middle of the top and bottom of the second housing 2. These limiting slots 19 are slidably connected to the limiting posts 18, and their length is equal to that of the slide slot 15. The sliding connection between the limiting posts 18 and the limiting slots 19 limits the telescopic range of the first housing 1 within the second housing 2, preventing the first housing 1 from falling out of the second housing 2, thereby achieving the telescopic function of both.

[0036] Working principle:

[0037] Install the base 9 of the rolling assembly 3 in the positioning groove 6, place the ball 14 in the active cavity 10, and tighten the upper and lower covers of the first shell 1 by means of bolts or the like. The limiting column 18 protrudes from the top and bottom of the first shell 1, and the ball 14 protrudes from the through hole 5 of the first shell 1. At this time, the ball 14 has been restricted in the space of the active cavity 10 in the base 9 and will not be squeezed in or fall out. Then align the limiting column 18 with the limiting groove 19 of the second shell 2, align the balls 14 on both sides with one of the pairs of slots 16 in the slide groove 15, and tighten the upper and lower covers of the second shell 2 by means of bolts or the like. At this time, the assembly of this structure is completed, which is simple, convenient and stable.

[0038] When the first shell 1 and the second shell 2 need to be stretched, the first shell 1 and the second shell 2 are pulled apart in opposite directions, and the ball 14 moves from the slot 16 originally away from the first shell 1 to the slot 16 close to the first shell 1. In this process, the ball 14 first rolls from the original slot 16 along the arc-shaped outer ring of the slot 16 to the elastic slide 15. The slide 15 is squeezed by the ball 14, giving the ball 14 a rolling external force, so that the ball 14 rolls in the active cavity 10, driving the first shell 1 to move, until the ball 14 reaches the next slot 16, and smoothly enters the slot 16 along the arc-shaped outer ring of the slot 16, realizing the limited stretching of the first position of the first shell 1 and the second shell 2. Repeat this operation until the first shell 1 and the second The shell 2 forms the longest expanded length; at the same time, the limit column 18 moves from the end of the limit slot 19 along the limit slot 19 to the position corresponding to the next card slot 16, which is the stretching adjustment distance of one unit. The position of the limit column 18 can be observed from the outside of the second shell 2 to judge the stretching distance. When stretched to the longest distance, the limit column 18 moves from one end of the limit slot 19 to the other end, thereby limiting the stretching position between the first shell 1 and the second shell 2, so that the first shell 1 will not be stretched off the track, thereby realizing the stretching limit of the first shell 1 and the second shell 2; in the same way, the retraction limit of the first shell 1 and the second shell 2 can also be realized; therefore, this embodiment can use the rolling assembly 3 and the limit assembly 4 to realize rapid telescopic limit between mechanical parts without jamming.

[0039] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A telescopic limiting structure, characterized in that: include: A first shell (1) and a second shell (2), wherein a rolling assembly (3) is provided inside the first shell (1), and a limiting assembly (4) is provided inside the second shell (2), wherein the rolling assembly (3) protrudes from the outside of the first shell (1) and contacts the limiting assembly (4), and the first shell (1) is slidably connected in the second shell (2) via the rolling assembly (3) and the limiting assembly (4), and the rolling assembly (3) moves on the limiting assembly (4), thereby driving the first shell (1) to telescopically move inside the second shell (2).

2. A telescopic limiting structure according to claim 1, characterized in that: Through holes (5) are provided on both side walls of the first shell (1), and positioning grooves (6) are provided in the first shell (1) inside the through holes (5).

3. A telescopic limiting structure according to claim 2, characterized in that: The through hole (5) comprises a first through hole (7) and a second through hole (8), wherein the first through hole (7) is arranged on the outer wall surface of the first shell (1), and the second through hole (8) is arranged on the inner wall surface of the first shell (1), the area of the second through hole (8) is larger than the area of the first through hole (7), and the first through hole (7) gradually expands toward the second through hole (8).

4. A telescopic limiting structure according to claim 3, characterized in that: The rolling assembly (3) comprises a base (9), the base (9) being arranged on the positioning groove (6), an active cavity (10) being arranged inside the base (9), a circular hole (11) being opened on a side of the base (9) close to the through hole (5), the area of the circular hole (11) being larger than the area of the second through hole (8), and the active cavity (10) being in communication with the circular hole (11).

5. The telescopic limiting structure according to claim 4, characterized in that: The movable cavity (10) comprises a first cavity (12) and a second cavity (13), wherein the first cavity (12) is configured to be hemispherical, and the second cavity (13) is configured to be cylindrical, one end of the second cavity (13) is connected to the first cavity (12), and the other end is connected to the circular hole (11), and the cross-sectional areas of the first cavity (12) and the second cavity (13) are both equal to the area of the circular hole (11).

6. The telescopic limiting structure according to claim 5, characterized in that: The rolling assembly (3) further includes a ball (14), the ball (14) being arranged in the movable cavity (10), the diameter of the ball (14) being smaller than the diameter of the first cavity (12), the diameter of the ball (14) being equal to the diameter of the second through hole (8), the diameter of the ball (14) being larger than the diameter of the first through hole (7), the diameter of the ball (14) being larger than the farthest distance from the second cavity (13) to the circular hole (11), and the portion of the ball (14) protruding from the movable cavity (10) passing through the circular hole (11) and the through hole (5), and protruding from the outer wall of the first shell (1).

7. The telescopic limiting structure according to claim 6, characterized in that: The ball (14) is made of steel.

8. The telescopic limiting structure according to claim 6, characterized in that: The limiting assembly (4) includes a slide groove (15), at least two groups of clamping grooves (16) are evenly spaced in the slide groove (15), the connecting surface between the clamping groove (16) and the slide groove (15) is set as an arc surface, and the clamping groove (16) matches the protruding part of the ball (14).

9. The telescopic limiting structure according to claim 8, characterized in that: The limiting component (4) is made of POM material.

10. The telescopic limiting structure according to claim 8, characterized in that: A limiting sleeve (17) is further provided inside the first shell (1), and both ends of the limiting sleeve (17) are fixedly connected to limiting columns (18), and two groups of limiting columns (18) respectively penetrate and protrude from the top and bottom of the first shell (1); corresponding limiting grooves (19) are provided in the middle of the top and bottom of the second shell (2), and the limiting grooves (19) are slidably connected to the limiting columns (18), and the length of the limiting grooves (19) is equal to the length of the sliding groove (15).

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