Lockable multi-section telescopic device
By designing a multi-section telescopic device, which utilizes valve cores and limiting units to achieve sequential telescopic extension and retraction of multiple sections, the problem of limited support stroke range of existing lockable telescopic rods is solved, achieving greater support range and space saving.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- LIAOCHENG HASHIBAO FURNITURE CO LTD
- Filing Date
- 2023-12-21
- Publication Date
- 2026-06-26
AI Technical Summary
Existing lockable telescopic rods typically have only one telescopic section, resulting in a limited range of support strokes that cannot meet diverse usage needs.
Design a lockable multi-section telescopic device, including a push rod, an inner cylinder and an outer cylinder. By setting multiple valve cores and limiting units, multiple sections can be telescopically extended and retracted in sequence, reducing the overall length and increasing the support stroke range.
It achieves sequential expansion and contraction of multiple sections, saves space in the axial direction, expands the support stroke, meets diverse usage needs, and has a simple structure and is easy to process.
Smart Images
Figure CN117514995B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of lockable telescopic rods, and particularly relates to a lockable multi-section telescopic device. Background Technology
[0002] Multi-section telescopic poles typically consist of two or more inner and outer tubes, with the inner tubes having a higher frequency of extension and the outer tubes a relatively lower frequency, allowing for free extension and retraction to adjust the length. The pole body usually also includes springs and damping devices to reduce vibration and impact during extension and retraction. To use a multi-section telescopic pole, simply loosen the locking screw, adjust the length of the pole, and then tighten the locking screw. Due to its compact structure and ease of operation, multi-section telescopic poles are widely used in various fields.
[0003] With the continuous progress and development of society, telescopic poles have gradually taken on new forms, such as lockable telescopic poles, which are mainly achieved by using lockable gas springs. In other words, while providing a certain supporting force to the supported object, they can also freely adjust their overall length.
[0004] Currently, most commonly used lockable telescopic rods only have one telescopic rod section, meaning that only this section can be locked. Given the same cylinder length, this results in a limited range of support stroke, failing to adequately meet usage requirements. Therefore, we have developed a lockable multi-section telescopic device that allows multiple valve cores to open sequentially, ensuring the sequential extension and retraction of multiple telescopic rod sections. This reduces the overall length, saves space along the axial direction, and effectively increases the support stroke range, fully meeting usage needs. Summary of the Invention
[0005] To address the aforementioned technical problems, this invention proposes a lockable multi-section telescopic device that is rationally designed, simple in structure, easy to manufacture, and capable of sequentially opening multiple valve cores to ensure the sequential extension and retraction of multiple sections of the telescopic rod. This reduces the overall length, saves space in the axial direction, and effectively increases the support stroke range, thus fully meeting the usage requirements.
[0006] To achieve the above objectives, the present invention employs a lockable multi-section telescopic device, comprising a push rod, an inner cylinder, and an outer cylinder sequentially mounted from the inside out. Sealing components are respectively provided at the ends near the outer cylinder and the inner cylinder, and at the ends near the inner cylinder and the push rod. Both the inner and outer cylinders are filled with fluid. A first valve plug is provided at one end of the inner cylinder, containing a first valve core. A first oil hole is opened in the first valve plug corresponding to the first valve core. A second valve plug is provided at one end of the push rod, with one end of the first valve core penetrating into the inner cylinder. A second valve core, capable of driving the first valve core to open, is provided in the second valve plug, corresponding to the first valve core. A second oil hole is opened in the second valve plug corresponding to the second valve core. A reset unit is provided on the first valve core located within the inner cylinder to control the first valve core to achieve automatic reset after opening. A valve switch for driving the second valve core to open is provided on the push rod.
[0007] Preferably, a limiting unit is provided on the first valve plug located inside the outer cylinder body to limit the movement stroke of the first valve core.
[0008] Preferably, the reset unit includes a third elastic body for moving the first valve core.
[0009] Preferably, the fluid comprises a liquid.
[0010] Preferably, the limiting unit includes a second limiting rod for limiting the movement distance of the first valve core.
[0011] Preferably, the outer periphery of the second limiting rod is provided with a second elastic body for driving its movement, so as to release the movement restriction on the first valve core.
[0012] Preferably, the first valve plug located above the second limiting rod is also provided with a first limiting rod that restricts the first valve core to unlocking or not unlocking.
[0013] Preferably, one end of the first limiting rod is provided with a first elastic body that serves as a driving reset mechanism.
[0014] Preferably, one end of the first limiting rod extends through to the outside of the first valve plug.
[0015] Preferably, the inner wall of the inner cylinder is provided with a limiting part that limits the second valve plug and the push rod. The limiting part is a limiting protrusion provided on the inner wall of the inner cylinder and is made by stamping the outer wall of the inner cylinder.
[0016] Compared with the prior art, the advantages and positive effects of the present invention are as follows:
[0017] 1. This invention provides a lockable multi-section telescopic device. The lockable multi-section telescopic device provided in this embodiment has three sections, but can also be configured with multiple sections as needed. Through the established limiting unit, the effect of multiple valve cores opening sequentially is achieved, thereby ensuring the sequential extension and retraction of multiple sections, reducing the overall length, saving space in the axial direction, and effectively solving the problem that existing lockable telescopic rods only have one telescopic rod section and can only be locked on this section, resulting in a limited support stroke range under the premise of the same cylinder length. This device has a reasonable design, simple structure, and convenient processing, and can realize the sequential opening of multiple valve cores to ensure the sequential extension and retraction of multiple telescopic rod sections, reducing the overall length, saving space in the axial direction, and effectively increasing the support stroke range, fully meeting the usage requirements. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of a lockable multi-section telescopic device.
[0020] Figure 2 A cross-sectional view of the internal structure of a lockable multi-section telescopic device;
[0021] Figure 3 for Figure 2 A partially enlarged schematic diagram of the structure at point A;
[0022] In the above figures, 1. outer cylinder; 2. first valve plug; 3. first limit rod; 4. first spring; 5. second limit rod; 6. second spring; 7. first valve core; 8. inner cylinder; 9. first oil hole; 10. third spring; 11. limit protrusion; 12. second valve core; 13. valve switch; 14. second valve plug; 15. push rod; 16. second oil hole. Detailed Implementation
[0023] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0024] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.
[0025] Examples, such as Figures 1-3 As shown, a lockable multi-section telescopic device includes a push rod 15, an inner cylinder 8, and an outer cylinder 1, which are sequentially mounted from the inside out. Sealing components are provided at the ends near the inner cylinder 8 and the outer cylinder 1, respectively, between the outer cylinder 1 and the inner cylinder 8 and between the inner cylinder 8 and the push rod 15. These sealing components, especially at the open ends of the inner cylinder 8 and the outer cylinder 1, seal the pressure inside the device and ensure the effective implementation of the telescopic movement. Both the inner cylinder 8 and the outer cylinder 1 are filled with fluid. A first valve plug 2 is provided at one end of the inner cylinder 8, and a first valve core 7 is provided inside the first valve plug 2. A first oil hole 9 is opened in the first valve plug 2 corresponding to the first valve core 7. The push rod 15... A second valve plug 14 is provided at one end, and one end of the first valve core 7 extends into the inner cylinder 8. A second valve core 12, which can drive the first valve core 7 to open, is provided inside the second valve plug 14, corresponding to the first valve core 7. A second oil hole 16 is opened in the second valve plug 14 corresponding to the second valve core 12. The outer cylinder 1, inner cylinder 8, push rod 15, first valve plug 2, second valve plug 14, first valve core 7, and second valve core 12 are all coaxially arranged to ensure the effective configuration of the device and meet usage requirements. It should be further noted that the first valve plug 2 and the second valve plug 14, located respectively in the outer cylinder 1 and inner cylinder 8... Sealing gaskets are respectively provided at the ends of the outer circumference near the outer end to divide the inner cavity of the outer cylinder 1 and the inner cylinder 8 into two parts, namely the rod chamber and the rodless chamber. One end of the outer cylinder 1 and the inner cylinder 8 is a closed end, and the other end is an open end, which effectively improves the rationality of the device setup. In addition, it should be further explained that a sealing ring is also provided between the first valve plug 2 and the first valve core 7. The movement of the first valve core 7 in the extension direction can realize the control of the opening and closing between the rod chamber and the rodless chamber in the outer cylinder 1. A sealing ring is also provided between the second valve plug 14 and the second valve core 12. The movement of the second valve core 12 in the extension direction can realize the control of the opening and closing between the rod chamber and the rodless chamber in the outer cylinder 1. The system controls the connection and disconnection between the rod-side chamber and the rodless chamber within the inner cylinder 8. When the first valve core 7 and the second valve core 12 move to one end, a channel is opened between the valve core and the valve plug, allowing communication between the rod-side chamber and the rodless chamber within the corresponding cylinder via the first oil hole 9 or the second oil hole 16, enabling liquid flow. The first valve core 7, located within the inner cylinder 8, is equipped with a reset unit for automatically resetting after opening. A valve switch 13, which drives the second valve core 12 to open, is threaded through the push rod 15. The operation of the telescopic device is controlled by an external pull rope device (not shown in the figure), fully meeting the usage requirements.
[0026] To ensure that the lockable multi-section telescopic device can achieve sequential telescopic movement of multiple sections, a limiting unit is provided on the first valve plug 2 located inside the outer cylinder 1 to limit the movement stroke of the first valve core 7. This ensures that the push rod 15 extends outward only after the inner cylinder 8 has extended to its full position. In other words, while ensuring that the device has good telescopic movement, it not only ensures the smoothness of its operation, but also limits its position, thereby effectively ensuring the realization of sequential telescopic movement of multiple sections and meeting the usage requirements.
[0027] To ensure the automatic reset of the first valve core 7 after its opening, the reset unit includes a third spring 10 (third elastic body) for moving the first valve core 7. One end of the first valve core 7 is T-shaped to provide a convenient placement position for the third spring 10 (third elastic body). In other words, both ends of the third spring 10 (third elastic body) abut against the inner wall of the inner cylinder 8 and the inner side of one end of the first valve core 7, respectively, to ensure the effectiveness of use and prevent it from falling off, thus ensuring the effective realization of the reset action.
[0028] To ensure the effective operation of the lockable multi-section telescopic device, the fluid includes gases and liquids, such as nitrogen and hydraulic oil. When the valve stem is controlled, the flow of fluid within the device creates pressure changes, thereby completing the corresponding extension or contraction, ensuring the desired performance.
[0029] To effectively ensure the proper functioning of the device, the limiting unit includes a second limiting rod 5 positioned within the first valve plug 2 and perpendicular to the first valve core 7. The second limiting rod 5 is restricted by the first limiting rod 3 from unlocking and moving the first valve core 7. The upper end face of the second limiting rod 5, near the first limiting rod 3, is spherical, but can also be conical or inclined, so that the first limiting rod 3, under the push of the first spring 4 (first elastic body), overcomes the resistance of the second spring 6 (second elastic body), thereby causing the second limiting rod 5 to reset. The outer periphery of the first valve core 7, corresponding to the lower end of the second limiting rod 5, has an inwardly concave trapezoidal shape. The first valve core 7, designed with an inwardly concave trapezoidal shape, has a thinner section at the top and thicker sections on both sides. When the second limiting rod 5 is in the initial position, one end of the second limiting rod 5 extends out. When the first valve core 7 performs the opening action, the thicker section of the first valve core 7 abuts against the second limiting rod 5 to limit the continued movement of the first valve core 7. It should be further noted that the distance between the end of the first valve core 7 near the closed end of the outer cylinder 1 and the thinner section of the first valve core 7 is less than the distance between the end of the second valve core 12 near the closed end of the outer cylinder 1 and the thinner section of the second valve core 12. This greatly improves the rationality of the device design and ensures the effectiveness of use.
[0030] To fully push the second limiting rod 5, the second limiting rod 5 is designed in a T shape, and a second spring 6 (second elastic body) is sleeved on the lower outer periphery of it. In other words, the design below the second limiting rod 5 provides convenient conditions for the installation of the second spring 6 (second elastic body), ensuring the effective realization of the equipment operation. At the same time, the second spring 6 (second elastic body) is used to drive the second limiting rod 5 to move, thereby releasing the movement restriction on the first valve core 7. Of course, this operation is realized only when the first limiting rod 3 moves towards the closed end near the outer cylinder 1. The cooperation between the components is good, effectively improving the functionality of the device.
[0031] To further improve the rationality of the device design, a first limiting rod 3 is also provided inside the first valve plug 2 located above the second limiting rod 5 to restrict the unlocking function of the first valve core 7. Of course, the first valve plug 2 has a hole for accommodating the movement of the first limiting rod 3. One end of the first limiting rod 3 is provided with a first spring 4 (first elastic body) that acts as a drive and reset mechanism. The first spring 4 (first elastic body) resets the position of the first limiting rod 3. The side of the first limiting rod 3 closest to the second limiting rod 5 is I-shaped, while the other side is T-shaped and extends to the outside of the first valve plug 2. The I-shaped first limiting rod 3... One end is used to make way for the vertical movement of the second limiting rod 5, making the cooperation between the components smoother and better meeting the usage requirements. In other words, for the design of the side of the first limiting rod 3 that extends to the outside of the first valve plug 2 away from the closed end of the outer cylinder 1, when the inner cylinder 8 is extended to its maximum, one end of the first limiting rod 3 abuts against the corresponding sealing component located near the outside of the push rod 15, thereby pushing the first limiting rod 3 to move. The groove at the I-shaped part will then move to one end of the second limiting rod 5. In this way, the second limiting rod 5 can move vertically under the action of the second spring 6 (second elastic body), thereby unlocking the first valve core 7 and ensuring the extension of the workpiece.
[0032] To effectively position and limit the second valve plug 14 during the reset process, a limiting part is provided on the inner wall of the inner cylinder 8 to limit the second valve plug 14 and the push rod 15. The limiting part is a limiting protrusion 11 on the inner wall of the inner cylinder 8, which is stamped from the outer wall of the inner cylinder 8. Specifically, the outer periphery of the limiting part is designed in an arc shape and protrudes from the inner wall of the inner cylinder 8. In this way, the stamped limiting protrusion 11 is used to limit the position of the second valve plug 14, so that there is a certain distance between it and one end of the inner cylinder 8, which facilitates the storage of fluid. This ensures the normal use and operation of the lockable multi-section telescopic device provided in this embodiment and effectively meets the usage requirements.
[0033] The specific working principle and working method are described as follows: This device should be used in an inverted position during use, that is, the closed end of the outer cylinder 1 should be higher than the end of the push rod 15 that is far away from the second valve plug 14, so that the gas is always kept in the rodless chamber;
[0034] During the extension process, valve switch 13 is pressed into push rod 15, thereby pushing the second valve core 12 towards the first valve core 7 and opening the first valve core 7. When the first valve core 7 abuts against the second limiting rod 5, the first limiting rod 3 restricts the movement of the second limiting rod 5, thus preventing the second limiting rod 5 from moving and further hindering the first valve core 7 from moving. At this time, the rodless chamber and rod chamber in the inner cylinder 8 are not connected, while the rodless chamber and rod chamber in the outer cylinder 1 are connected. The inner cylinder 8 and outer cylinder 1 can move relative to each other until one end of the first limiting rod 3 abuts against the limiting component. The movement of the first limiting rod 3 releases the restriction on the second limiting rod 5, and the movement of the second limiting rod 5 releases the restriction on the first valve core 7. The second valve core 12 can drive the first valve core 7 to continue moving. The thinner part of the upper middle part of the second valve core 12 moves to one end of the second valve plug 14. The rodless chamber and the rod chamber in the inner cylinder 8 are connected. The push rod 15 can extend outward. When the second valve core 12 is separated from the first valve core 7, the first valve core 7 is reset under the action of the third spring 10 (third elastic body), thereby blocking the connection between the rodless chamber and the rod chamber in the outer cylinder 1, realizing the locking between the inner cylinder 8 and the outer cylinder 1. When the push rod 15 moves to the position, the pressure on the valve switch 13 stops. The second valve core 12 is reset under the pressure of the fluid in the inner cylinder 8 and blocks the connection between the rodless chamber and the rod chamber in the inner cylinder 8, realizing the locking between the push rod 15 and the inner cylinder 8.
[0035] During retraction, the valve switch 13 is pressed into the push rod 15, which pushes the second valve core 12 to open, connecting the rodless and rod chambers in the inner cylinder 8, thus unlocking the inner cylinder 8 and the push rod 15. The push rod 15 retracts into the inner cylinder 8 until the second valve core 12 abuts against the first valve core 7, and pushes the first valve core 7 to move, thus connecting the rodless and rod chambers in the outer cylinder 1, thus unlocking the inner cylinder 8 and the outer cylinder 1. The inner cylinder 8 retracts into the outer cylinder 1 until the second valve plug 14 abuts against the limiting protrusion 11. At this point, the entire device is retracted to its shortest state, and the pressing of the valve switch 13 stops. The first valve core 7 and the second valve core 12 reset, thus locking the inner cylinder 8 to the outer cylinder 1 and the push rod 15 respectively.
[0036] In the above process: The lockable multi-section telescopic device provided in this embodiment has three sections, but can also be configured with multiple sections as needed. Through the established limiting unit, the effect of multiple valve cores opening sequentially is achieved, thereby ensuring the sequential extension and retraction of multiple sections, reducing the overall length, saving space in the axial direction, and effectively solving the problem that existing lockable telescopic rods only have one telescopic rod section and can only lock this section, resulting in a limited range of support stroke under the premise of cylinder of the same length; This device is reasonably designed, simple in structure, easy to process, and can realize the sequential opening of multiple valve cores to ensure the sequential extension and retraction of multiple sections of the telescopic rod, reducing the overall length, saving space in the axial direction, and effectively increasing the range of support stroke, fully meeting the usage requirements.
[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.
Claims
1. A lockable multi-section telescopic device, characterized in that, The device comprises a push rod, an inner cylinder, and an outer cylinder, which are sequentially assembled from the inside out. Sealing assemblies are provided between the outer cylinder and the inner cylinder, and between the inner cylinder and the push rod, near the opening of each cylinder. Both the inner and outer cylinders are filled with fluid. A first valve plug is located at one end of the inner cylinder, containing a first valve core. A first oil hole is formed in the first valve plug corresponding to the first valve core. A second valve plug is located at one end of the push rod, with one end of the first valve core extending into the inner cylinder. A second valve core, capable of opening the first valve core, is located in the second valve plug, and a second valve plug corresponding to the second valve core is also provided. The inner cylinder has a second oil hole. A reset unit is provided on the first valve core located inside the inner cylinder to control the first valve core to automatically reset after it is opened. A valve switch for driving the second valve core to open is provided on the push rod. A limiting unit is provided on the first valve plug located inside the outer cylinder to limit the movement stroke of the first valve core. The limiting unit includes a second limiting rod for limiting the movement distance of the first valve core. A second elastic body is provided on the outer periphery of the second limiting rod to drive its movement, so as to release the movement restriction of the first valve core. A first limiting rod is also provided in the first valve plug located above the second limiting rod to limit whether the first valve core is unlocked or not.
2. The lockable multi-section telescopic device according to claim 1, characterized in that, The reset unit includes a third elastic body for moving the first valve core.
3. A lockable multi-section telescopic device according to claim 2, characterized in that, The fluid includes liquids.
4. A lockable multi-section telescopic device according to claim 1, characterized in that, One end of the first limiting rod is provided with a first elastic body that serves as a drive and reset mechanism.
5. A lockable multi-section telescopic device according to claim 4, characterized in that, One end of the first limiting rod extends through to the outside of the first valve plug.
6. A lockable multi-section telescopic device according to any one of claims 1, 3-5, characterized in that, The inner wall of the inner cylinder is provided with a limiting part that limits the second valve plug and the push rod.