Telescopic seat post

Abstract

The invention provides a telescopic seat post which comprises a supporting pipe, a seat pipe, a base, a speed reduction module, an elastic piece, a first outer pipe and a second outer pipe. The seat tube penetrates through the supporting tube in a sliding mode. The base is connected to one end of the seat tube away from the support tube. The deceleration module is connected to the support tube and sleeves the seat tube. The elastic member sleeves the base and the deceleration module and is spaced from the seat tube. A part of the elastic member presses the deceleration module along the normal direction. The first outer pipe is connected to the supporting pipe and surrounds the supporting pipe. The second outer tube is connected to the base and accommodates the seat tube. When the seat tube slides relative to the supporting tube in the first direction to switch the compression mode, the base compresses the elastic piece. When the seat tube slides relative to the supporting tube in the second direction opposite to the first direction to switch the extension mode, the elastic piece elastically recovers to push the base.

Description

Technical Field

[0001] This invention relates to a structure for adjusting length, and more particularly to a telescopic seat post for bicycles. Background Technology

[0002] Currently, telescopic seatposts used in bicycles are broadly classified into two types: hydraulic and mechanical. Hydraulic telescopic seatposts offer adjustable telescopic length, providing greater freedom of adjustment, and feature damping to slow down the lifting and lowering speeds. However, hydraulic telescopic seatposts are more expensive to manufacture. Mechanical telescopic seatposts, on the other hand, use a slider and ball bearing for positioning. The ball bearing moves smoothly during its movement. A steel cable releases the ball bearing, and a return mechanism pushes the seatpost back to its initial travel.

[0003] However, most existing mechanical telescopic seatposts use an elastic push mechanism for their rebound. To prevent the rebound speed from being too fast and directly impacting the rider's buttocks, the elastic force of the elastic element is usually adjusted to be sufficient to push the seatpost back (rebound elastic force ≥ maximum seatpost friction). Therefore, the elastic coefficient of the elastic element is relatively small. As a result, when the rider sits on the seatpost and presses down, the supporting elastic force of the elastic element is small. After bearing the rider's weight, the seatpost will descend too quickly, causing the rider's buttocks to receive excessive impact and resulting in discomfort. It is difficult to balance the rebound speed and the supporting elastic force. Summary of the Invention

[0004] This invention provides a telescopic seat post that can effectively slow down the downward and backward speeds of the telescopic seat post during the switching process of pressing down and pushing back, so as to avoid the impact of external force caused by excessive downward speed and also to avoid impact on the user due to excessive backward speed, thereby setting an appropriate elastic coefficient.

[0005] The telescopic seat post of the present invention includes a support tube, a seat tube, a base, a deceleration module, an elastic element, a first outer tube, and a second outer tube. The seat tube is slidably inserted through the support tube. The base is connected to the end of the seat tube away from the support tube. The deceleration module is connected to the support tube and sleeved on the seat tube. The elastic element is sleeved on the base and the deceleration module and spaced apart from the seat tube; a portion of the elastic element presses down on the deceleration module along the normal direction. The first outer tube is connected to the support tube and surrounds the support tube, and has a mounting seat located at the end away from the base. The second outer tube is connected to the base and accommodates the seat tube. When the seat tube slides relative to the support tube in a first direction to switch the compression mode, the base compresses the elastic element. When the seat tube slides relative to the support tube in a second direction opposite to the first direction to switch the extension mode, the elastic element elastically recovers to push the base.

[0006] Based on the above, the telescopic seat rod of the present invention, combined with the deceleration module and the elastic element, has a damping effect when the telescopic seat rod switches to compression mode or extension mode to slow down the lifting speed.

[0007] Furthermore, during the transition from telescopic seatpost to compressed mode, the seatpost and deceleration module interfere with each other to increase downward resistance, thereby reducing the descent speed of the seatpost. Compared to existing mechanical telescopic seatposts, this improves the riding experience against rapid slippage and stalling. During the transition from telescopic seatpost to extended mode, the seatpost and deceleration module interfere with each other to increase backward resistance, thereby reducing the upward speed of the seatpost and preventing excessive backward impact on the user. Attached Figure Description

[0008] Figure 1A This is a perspective view of a telescopic seat rod according to an embodiment of the present invention;

[0009] Figure 1B yes Figure 1A A cross-sectional schematic diagram of the telescopic seat pole;

[0010] Figure 1C yes Figure 1A A plan view of some components of the telescopic seat pole;

[0011] Figure 1D yes Figure 1C A cross-sectional diagram of the telescopic seat post switching to extended mode;

[0012] Figure 1E yes Figure 1C A cross-sectional diagram of the telescopic seat pole switching to compression mode;

[0013] Figure 2 yes Figure 1A The force curve difference diagram of the telescopic seat pole;

[0014] Figure 3A This is a plan view of a telescopic seat rod according to another embodiment of the present invention;

[0015] Figure 3B yes Figure 3A A cross-sectional diagram of the telescopic seat post switching to extended mode;

[0016] Figure 3C yes Figure 3A A cross-sectional diagram of the telescopic seat pole switching to compression mode;

[0017] Figure 4A This is a plan view of a telescopic seat rod according to another embodiment of the present invention;

[0018] Figures 4B to 4D yes Figure 4A A schematic diagram illustrating the switching action between the extension mode and the compression mode of the telescopic seat post;

[0019] Figure 4E yes Figure 4AA schematic diagram illustrating the switching action between the extension mode and the compression mode of the telescopic seat post;

[0020] Figure 5 yes Figure 4A The force curve difference diagram of the telescopic seat pole.

[0021] Explanation of icon numbers 100:

[0023] 100, 100A, 100B: Telescopic seat pole;

[0024] 110, 110b: Support pipe;

[0025] 111: Groove;

[0026] 120, 120a, 120b: Seat tube;

[0027] 130, 130a, 130b: Base;

[0028] 140, 140a, 140b: Reduction modules;

[0029] 141, 141a, 141b: Bushings;

[0030] 142, 142a, 142b: Elastic rings;

[0031] 150, 150a, 150b: Elastic components;

[0032] 160: Clip-on module;

[0033] 161: Sliding seat;

[0034] 162: Ball bearing;

[0035] 163: Top block;

[0036] 170: First outer tube;

[0037] 171: Mounting bracket;

[0038] 180: Second outer tube;

[0039] S: Opening;

[0040] MS: Sliding space;

[0041] ND: Normal direction;

[0042] GP: gap;

[0043] D1: First direction;

[0044] D2: Second direction;

[0045] C1~C4: Curves. Detailed Implementation

[0046] Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same component reference numerals are used in the drawings and description to denote the same or similar parts.

[0047] Figure 1A This is a perspective view of a telescopic seat rod according to an embodiment of the present invention. Figure 1B yes Figure 1A A cross-sectional view of the telescopic seat pole. Figure 1C yes Figure 1A A plan view of some components of the telescopic seat pole. Figure 1D yes Figure 1C A cross-sectional diagram showing the telescopic seat pole switching to extended mode. Figure 1E yes Figure 1C A cross-sectional diagram showing the telescopic seat pole switching to compression mode.

[0048] refer to Figure 1A and Figure 1C The telescopic seat post 100 of the present invention is suitable for bicycle seats for raising and lowering and adjusting seat height. Furthermore, the telescopic seat post 100 of the present invention employs a mechanical structure, suitable for switching between an extended mode and a compressed mode; in short, the extended mode is the longest and the compressed mode is the shortest, thus simplifying the complexity of adjusting the seat.

[0049] refer to Figures 1A to 1C The telescopic seat rod 100 of the present invention includes a support tube 110, a seat tube 120, a base 130, a deceleration module 140, an elastic element 150, a first outer tube 170, and a second outer tube 180.

[0050] The support tube 110 has a sliding space MS. The seat tube 120 is slidably inserted through the sliding space MS of the support tube 110. The base 130 is connected to the end of the seat tube 120 away from the support tube 110.

[0051] The deceleration module 140 is connected to the support tube 110 and sleeved on the seat tube 120. The deceleration module 140 is in contact with the seat tube 120 to continuously provide a fixed friction force to the seat tube 120. In practical applications, the magnitude of the friction force can be increased or decreased according to the change of the contact area between the deceleration module 140 and the seat tube 120, depending on the requirements.

[0052] The elastic element 150 is sleeved on the base 130 and the deceleration module 140 and spaced apart from the seat tube 120. Part of the elastic element 150 presses down on the deceleration module 140 along the normal direction ND.

[0053] The telescopic seat post 100 includes a latching module 160. The latching module 160 is connected to the other end of the seat post 120 and located in the sliding space MS of the support tube 110. The latching module 160 is adapted to be locked into the support tube 110 to switch to the extended mode (see...). Figure 1D ) or compression mode (see Figure 1E ).

[0054] The first outer tube 170 is connected to the support tube 110 and surrounds the support tube 110. The first outer tube 170 has a mounting base 171 located at the end away from the base 130, and the mounting base 171 is used to mount the seat. The second outer tube 180 is connected to the base 130 and accommodates the seat tube 120. The first outer tube 170 is connected to the support tube 110 by screwing, and the second outer tube 180 is connected to the base 130 by screwing.

[0055] refer to Figure 1D and Figure 1E The support tube 110 has multiple grooves 111, some of which are close to the deceleration module 140 to correspond to the extension mode, while others are away from the deceleration module 140 to correspond to the compression mode. The latching module 160 has a sliding seat 161, multiple balls 162, and a top block 163. The sliding seat 161 is fixed to one end of the seat tube 120 and moves with the seat tube 120. The multiple balls 162 are movably disposed in multiple holes of the sliding seat 161. The top block 163 is disposed on the sliding seat 161 and abuts against the multiple balls 162 to respectively engage with the multiple grooves 111 of the support tube 110.

[0056] In addition, the top block 163 can be moved relative to the sliding seat 161 by external force, thereby releasing the top limit of the multiple balls 162.

[0057] refer to Figures 1C to 1E When the seat tube 120 slides relative to the support tube 110 along the first direction D1 to switch the compression mode, the base 130 compresses the elastic element 150, and the base 130 drives the seat tube 120 to move relative to the deceleration module 140. Since the deceleration module 140 continuously interferes with the seat tube 120 to increase the downward pressure resistance, the descent speed of the seat tube 120 relative to the support tube 110 is reduced until the multiple balls 162 of the latching module 160 engage with the multiple grooves 111 of the support tube 110 corresponding to the compression mode.

[0058] refer to Figures 1E to 1DWhen the seat tube 120 slides relative to the support tube 110 along a second direction D2 opposite to the first direction D1 to switch the extension mode, the elastic element 150 elastically recovers to push the base 130, and the base 130 drives the seat tube 120 to move relative to the deceleration module 140. Since the deceleration module 140 continuously interferes with the seat tube 120 to increase the back push resistance, the rising speed of the seat tube 120 relative to the support tube 110 is reduced until the multiple balls 162 of the latching module 160 engage with the multiple grooves 111 of the support tube 110 corresponding to the extension mode.

[0059] refer to Figures 1C to 1E Specifically, the deceleration module 140 has a bushing 141 and an elastic ring 142. The bushing 141 is fixed to the support tube 110 and has a receiving space AS. The elastic ring 142 is disposed in the receiving space AS and contacts the seat tube 120. The bushing 141 completely seals the elastic ring 142 and applies force to the elastic ring 142, so that the elastic ring 142 is compressed and continuously interferes with the seat tube 120. The other part of the elastic element 150 gradually increases the force on the bushing 141 during compression to provide additional resistance, while the elastic element 150 gradually decreases the force on the bushing 141 during elongation to reduce additional resistance.

[0060] Figure 2 yes Figure 1C The force curve difference diagram of the telescopic seat pole.

[0061] Figure 2 The horizontal axis represents length, defined as the overlap length between the seat tube 120 and the support tube 110. In the extended mode, the overlap length between the seat tube 120 and the support tube 110 is 0 (mm), and in the compressed mode, the overlap length between the seat tube 120 and the support tube 110 is 80 (mm). Figure 2 The longitudinal axis is force, defined as the force borne by the seat tube 120 when it moves (including the elastic force of the elastic element 150 and the frictional force of the elastic ring 142).

[0062] Reference Figure 1D , Figure 1E and Figure 2 Curve C1 shows the force variation of the telescopic seat post 100 without the reduction module 140. During the transition from the self-extension mode to the compression mode of the telescopic seat post 100, the force acting on the seat tube 120 ranges from 4 kgf to 9 kgf. Curve C2 shows the force variation of the telescopic seat post 100 with the reduction module 140. (Refer to...) Figures 1D to 1EDuring the process of the telescopic seat post 100 switching from the extension mode to the compression mode, the multiple gaps GP of the elastic element 150 gradually narrow, which gradually increases the overlapping area between the elastic element 150 and the bushing 141, and the degree of interference between the elastic ring 142 and the seat tube 120 remains unchanged, meaning that the elastic ring 142 continuously provides friction to the seat tube 120, so the force acting on the seat tube 120 is 7.5 (kgf) to 10 (kgf).

[0063] In short, a comparison of curves C1 and C2 shows that during the downward pressing process, the force acting on the seat tube 120 increases from 4 (kgf) to 9 (kgf) to 7 (kgf) to 10 (kgf). This indicates that the resistance during the descent of the seat tube 120 increases, meaning that the seat tube 120 needs to overcome the elastic force of the elastic element 150 and the frictional force of the elastic ring 142 when it descends, thus reducing the descent speed of the seat tube 120.

[0064] Reference Figure 1D , Figure 1E and Figure 2 Curve C1 is a force variation diagram of the telescopic seat post 100 without the deceleration module 140, in the self-compression mode of the telescopic seat post 100 (see...). Figure 1E Switch to elongation mode (see) Figure 1D During the process, the force pushing back the seat post 120 is from 6 kgf to 0 kgf. Curve C2 is a force change diagram of the telescopic seat post 100 combined with the reduction module 140, in the self-compression mode of the telescopic seat post 100 (see...). Figure 1E Switch to elongation mode (see) Figure 1D During the process, the multiple gaps GP of the elastic element 150 gradually increase, causing the overlapping area of ​​the elastic element 150 and the bushing 141 to gradually decrease, and the degree of interference between the elastic ring 142 and the seat tube 120 remains unchanged, meaning that the elastic ring 142 continuously provides friction to the seat tube 120, so the force pushing the seat tube 120 back is 4 (kgf) to 0 (kgf).

[0065] The comparison between curves C1 and C2 shows that the force of the seat tube 120 during the push-back process decreases from 6.5 kgf to 0 kgf to 5 kgf to 0 kgf. This indicates that the resistance of the seat tube 120 increases during the upward process. That is, the elastic force of the elastic element 150 needs to overcome the friction of the elastic ring 142 to push the seat tube 120 back, thus reducing the upward speed of the seat tube 120.

[0066] Figure 3A This is a plan view of a telescopic seat rod according to another embodiment of the present invention. Figure 3B yes Figure 3A A cross-sectional diagram showing the telescopic seat pole switching to extended mode. Figure 3C yes Figure 3A A cross-sectional diagram showing the telescopic seat pole switching to compression mode.

[0067] refer to Figures 3A to 3C In this embodiment, the telescopic seat rod 100A and Figure 1C The telescopic seat post 100 differs in that the bushing 141a of the deceleration module 140a has an opening S on the side facing the base 130a, and the opening S connects to the receiving space AS. The bushing 141a partially exposes the elastic ring 142a, which is disposed in the receiving space AS and contacts the seat post 120a. The bushing 141a applies force to the elastic ring 142a in the normal direction ND, so that the elastic ring 142a is compressed and continuously interferes with the seat post 120a, and part of the elastic element 150a presses down on the bushing 141a.

[0068] Figure 4A This is a plan view of a telescopic seat rod according to another embodiment of the present invention. Figures 4B to 4D yes Figure 4A A schematic diagram illustrating the switching action between the extended and compressed modes of the telescopic seat post. Figure 4E for Figure 4A A schematic diagram illustrating the switching action between the extended and compressed modes of the telescopic seat post.

[0069] refer to Figure 4A , Figure 4B and Figure 4E In this embodiment, the telescopic seat rod 100B and Figure 1A The telescopic seat post 100 differs in that the bushing 141b has an opening S on the side facing the base 130b and multiple through holes TH extending along the normal direction ND, with the opening S connecting to the receiving space AS. An elastic ring 142b is disposed in the receiving space AS and contacts the seat post 120b. A portion of the elastic ring 142b is located within the multiple through holes TH and is flush with the outer surface OS of the bushing 141b. The bushing 141b applies force to the elastic ring 142b along the normal direction ND, causing the elastic ring 142b to be compressed and continuously interfere with the seat post 120b. Additionally, a portion of the elastic element 150b presses down on the bushing 141b and the elastic ring 142b.

[0070] refer to Figures 4B to 4D When the seat tube 120b slides relative to the support tube 110b along the first direction D1 to switch the compression mode, the base 130b compresses the elastic element 150b, and the base 130b drives the seat tube 120b to move relative to the deceleration module 140b. Since the elastic element 150b gradually presses down on the elastic ring 142b of the deceleration module 140b, the degree of interference of the deceleration module 140b with the seat tube 120b gradually increases. Therefore, the seat tube 120b will significantly increase the downward pressure resistance after being pressed down for a period of time, thereby reducing the descent speed of the seat tube 120b relative to the support tube 110b.

[0071] refer to Figures 4D to 4BWhen the seat tube 120b slides relative to the support tube 110b along the second direction D2 to switch the extension mode, the elastic element 150b elastically recovers to push the base 130b, and the base 130b drives the seat tube 120b to move relative to the deceleration module 140b. Since the elastic element 150b gradually reduces the pressure on the elastic ring 142b of the deceleration module 140b, the degree of interference of the deceleration module 140b with the seat tube 120b also gradually decreases. In the early stage of the seat tube 120b's ascent, it has the effect of increasing the back push resistance, thereby reducing the rising speed of the seat tube 120b relative to the support tube 110b.

[0072] Figure 5 yes Figure 4A The force curve difference diagram of the telescopic seat pole.

[0073] Figure 5 The horizontal axis represents length, defined as the overlap length between the seat tube 120b and the support tube 110b. In the extended mode, the overlap length between the seat tube 120b and the support tube 110b is 0 (mm), and in the compressed mode, the overlap length between the seat tube 120b and the support tube 110b is 80 (mm). Figure 2 The longitudinal axis is force, defined as the force borne by the seat tube 120b when it moves (including the elastic force of the elastic element 150b and the frictional force of the elastic ring 142b).

[0074] Reference Figure 5 and Figures 4B to 4D Curve C3 is a force variation diagram of the telescopic seat post 100B without the deceleration module 140b, in the self-extending mode of the telescopic seat post 100B (see...). Figure 4B Switch to compression mode (see) Figure 4D During the process, the force acting on the seat post 120b is 4 kgf to approximately 9 kgf. Curve C4 is a force variation diagram of the telescopic seat post 100B combined with the reduction module 140b, for reference. Figures 4D to 4B During the process of the telescopic seat post 100 switching from the self-extension mode to the compression mode, the multiple gaps GP of the elastic element 150b gradually narrow, which gradually increases the overlapping area of ​​the elastic element 150b, bushing 141b, and elastic ring 142b. As the area of ​​the elastic element 150b directly pressing down on the elastic ring 142b increases, the degree of interference between the elastic ring 142b and the seat post 120b gradually increases. This means that the frictional force provided by the elastic ring 142b to the seat post 120b gradually increases with the compression of the elastic element 150b. Therefore, the force acting on the seat post 120b is 4 (kgf) to 10 (kgf).

[0075] In short, a comparison of curves C3 and C4 shows that during the downward pressure process, the force acting on the seat tube 120b increases from 4 kgf to 9 kgf to 4 kgf to 10 kgf. This indicates that the resistance during the descent of the seat tube 120b increases gradually (the downward pressure resistance can be increased by 10% to 50% as needed). When the seat tube 120b descends to the final stage (see...), the resistance gradually increases. Figures 4C to 4D (The overlap length between the seat tube 120 and the support tube 110 is in the range of 60mm-80mm). The frictional force exerted by the elastic ring 142b on the seat tube 120b increases significantly. Therefore, the seat tube 120b only produces a deceleration effect at the end of the pressing process, rather than at the beginning. This design ensures that the seat tube 120b decelerates noticeably only after pressing down more than 60mm, improving the smoothness of the telescopic seat post 100B's downward movement and preventing an excessively long transition time between the extension and compression modes.

[0076] Reference Figure 5 , Figures 4B to 4D Curve C3 is a force variation diagram of the telescopic seat post 100B without the deceleration module 140b, in the self-compression mode of the telescopic seat post 100B (see...). Figure 4D Switch to elongation mode (see) Figure 4B During the process, the force pushing back the seat post 120b is approximately 6.5 kgf to 0 kgf. Curve C4 is a force variation diagram of the telescopic seat post 100B combined with the reduction module 140, in the self-compression mode of the telescopic seat post 100B (see...). Figure 4D Switch to elongation mode (see) Figure 4B During the process, the multiple gaps GP of the elastic element 150b gradually increase, which gradually reduces the overlapping area of ​​the elastic element 150b with the bushing 141b and the elastic ring 142b. As the area of ​​the elastic element 150b directly pressing down on the elastic ring 142b becomes smaller, the degree of interference between the elastic ring 142b and the seat tube 120b gradually decreases. Therefore, the force pushing back the seat tube 120 is 5 (kgf) to 0 (kgf).

[0077] In short, a comparison of curves C3 and C4 shows that during the push-back process, the force acting on seat tube 120b decreases from 6.5 kgf to 0 kgf to 5 kgf to 0 kgf. This indicates that the resistance during the ascent of seat tube 120b increases gradually (the ascent resistance can be increased by 10% to 50% as needed). In the initial stage of ascent (see...), the resistance of seat tube 120b... Figures 4D to 4C (The overlap length between the seat tube 120 and the support tube 110 is in the range of 80mm-60mm) The frictional force of the elastic ring 142b acting on the seat tube 120b still exists. That is, the elastic force of the elastic element 150b needs to overcome the frictional force of the elastic ring 142b in order to push the seat tube 120b back. Therefore, the seat tube 120b still has a deceleration effect in the initial stage of the rising process.

[0078] refer to Figure 5 and Figure 4E When the seat tube 120b is in the later stage of ascent (the overlap length between the seat tube 120 and the support tube 110 is 60mm-0mm), the increased gap GP of the elastic element 150b makes the area of ​​the directly pressing elastic ring 142b significantly smaller. Therefore, part of the deformation of the elastic ring 142b enters the multiple perforations TH of the bushing 141b. As a result, the friction force of the elastic ring 142b acting on the seat tube 120b is significantly reduced, and the deceleration effect of the seat tube 120b in the later stage of ascent is reduced.

[0079] In this embodiment, the deceleration effect is significantly reduced after the seat post 120b is pushed back to less than 60mm, thereby improving the smoothness of the pushback of the telescopic seat post 100B and avoiding excessive time for switching from compression mode to extension mode.

[0080] In addition, the increased downward resistance and reduced rebound force in this embodiment achieve a deceleration effect during the two switching processes of downward pressure and rebound. The increased force is controlled by the degree of interference between the elastic ring 142b and the seat tube 120b. The higher the degree of interference, the slower the descent and rebound speed, and the lower the degree of interference, the smaller the deceleration effect of descent and rebound.

[0081] In summary, the telescopic seat pole of the present invention, combined with the deceleration module and the elastic element, has a damping effect when the telescopic seat pole switches to compression mode or extension mode, so as to slow down the lifting speed.

[0082] Furthermore, during the transition from telescopic seatpost to compressed mode, the seatpost and deceleration module interfere with each other to increase downward resistance, thereby reducing the descent speed of the seatpost. Compared to existing mechanical telescopic seatposts, this improves the riding experience against rapid slippage and stalling. During the transition from telescopic seatpost to extended mode, the seatpost and deceleration module interfere with each other to increase backward resistance, thereby reducing the upward speed of the seatpost and preventing excessive backward impact on the user.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A telescopic seat post, characterized in that, include: Support tube; A seat tube is slidably inserted into the support tube; The base is connected to the end of the seat tube away from the support tube. A deceleration module is connected to the support tube and sleeved on the seat tube; An elastic element, sleeved on the base and the deceleration module and spaced apart from the seat tube, partially presses down on the deceleration module along the normal direction. A first outer tube, connected to and surrounding the support tube, has a mounting base located at one end remote from the base; and The second outer tube is connected to the base to accommodate the seat tube. Specifically, when the seat tube slides relative to the support tube along a first direction to switch the compression mode, the base compresses the elastic element; when the seat tube slides relative to the support tube along a second direction opposite to the first direction to switch the extension mode, the elastic element elastically recovers to push the base.

2. The telescopic support rod according to claim 1, characterized in that, The deceleration module has a bushing and an elastic ring. The bushing is fixed to the support tube and has a receiving space. The elastic ring is disposed in the receiving space and its surface contacts the seat tube.

3. The telescopic seat rod according to claim 2, characterized in that, During the switching between the extension mode and the compression mode, the overlap area between the elastic element and the bushing of the telescopic seat rod continuously changes.

4. The telescopic support rod according to claim 2, characterized in that, During the process of switching from the elongation mode to the compression mode, the multiple gaps of the elastic element gradually narrow, causing the overlap area between the elastic element and the bushing to gradually increase. Conversely, during the process of switching from the compression mode to the elongation mode, the multiple gaps of the elastic element gradually increase, causing the overlap area between the elastic element and the bushing to gradually decrease.

5. The telescopic seat rod according to claim 3 or 4, characterized in that, The bushing completely seals the elastic ring, and the elastic element presses down on the bushing.

6. The telescopic support rod according to claim 3 or 4, characterized in that, The bushing has an opening on one side facing the base, and the opening communicates with the receiving space. The bushing partially exposes the elastic ring, and the elastic element presses down on the bushing.

7. The telescopic support rod according to claim 2, characterized in that, The bushing has an opening on the side facing the base and has a plurality of perforations extending along the normal direction. A portion of the elastic ring is located in the plurality of perforations and is flush with the outer surface of the bushing. The elastic element presses down on the bushing and the elastic ring.

8. The telescopic seat rod according to claim 7, characterized in that, During the process of switching from the elongation mode to the compression mode, the multiple gaps of the elastic element gradually narrow, causing the overlapping area of ​​the elastic element, the bushing, and the elastic ring to gradually increase, and the degree of interference between the elastic ring and the seat tube to gradually increase.

9. The telescopic support rod according to claim 7, characterized in that, During the process of switching from the compression mode to the elongation mode, the multiple gaps of the elastic element gradually increase, causing the overlap area between the elastic element, the bushing, and the elastic ring to gradually decrease, and the degree of interference between the elastic ring and the seat tube gradually decreases.

10. The telescopic seat post according to claim 1 further includes a snap-fit ​​module connected to the other end of the seat tube and located in the support tube, the snap-fit ​​module being adapted to be snapped into the support tube to switch between the extension mode and the compression mode.

11. The telescopic support rod according to claim 10, characterized in that, The snap-fit ​​module has a sliding seat, multiple balls, and a top block. The sliding seat is fixed to one end of the seat tube, and the multiple balls are movably disposed in multiple holes of the sliding seat. The top block is disposed on the sliding seat and abuts against the multiple balls, which are respectively engaged with multiple grooves of the support tube.

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