Rotating the upper tube to adjust the height of the seat tube

Abstract

The utility model provides a kind of seat pipe of rotation upper pipe adjustment lifting, it includes: lower pipe, lower pipe bottom is equipped with base;Upper pipe, upper pipe can be slidably arranged in lower pipe;And positioning device, positioning device is arranged between lower pipe and upper pipe, and upper pipe can be positioned at adjusted height, positioning device includes guide rail and positioning piece, guide rail is arranged in the bottom of lower pipe, and guide rail extends from the base of lower pipe towards upper pipe, guide rail is equipped with the track of longitudinal extension, track top is equipped with the first positioning slot of horizontal extension, track bottom is equipped with the second positioning slot of horizontal extension, positioning piece is arranged in the bottom of upper pipe, and make positioning piece partially located in the track of guide rail, positioning piece can selectively move to first positioning slot or second positioning slot.

Description

Technical Field

[0001] This utility model relates to a lifting seat tube, specifically a seat tube whose height position can be adjusted by rotating the upper tube. Background Technology

[0002] Cycling is a popular sport, so there are various design options for different parts of a bicycle for riders to choose from. Take the seatpost, for example. Early fixed seatposts required riders to lift both feet off the pedals, stop the bicycle at the side of the road, release the quick-release C-ring, then pull the seatpost up or down, and finally tighten the C-ring to fix the seat height. The disadvantage of this method was its complexity and slow adjustment speed.

[0003] Today's telescopic seatposts allow riders to raise the saddle automatically via a cable using a lever mounted on the handlebars. To lower the saddle, the same lever is used, and the saddle is pressed down. These actions allow riders to quickly control the saddle height without even taking their feet off the pedals, and even while the bicycle is in motion.

[0004] However, most current telescopic seatposts use an outer tube in conjunction with an inner tube, which is filled with oil and gas, and equipped with pistons and valves to control the raising and lowering of the telescopic seatpost.

[0005] The disadvantage is that the oil or gas filling the telescopic seatpost can leak due to poor sealing or impact damage. Leaking oil not only contaminates the frame and disables the telescopic seatpost's elevation and descent function, but also causes discomfort for the rider. Especially when the rider is sitting on the saddle, any leak could potentially cause personal injury, a situation that must be avoided. Utility Model Content

[0006] To solve the above problems, this utility model provides a seat tube with adjustable height by rotating the upper tube. After the upper tube is adjusted to the required height, the upper tube can be fixed in the required position through the positioning device, which effectively prevents the upper tube from changing the adjusted height.

[0007] In one embodiment of this utility model, a seat tube for adjusting the height of a rotating upper tube is provided, comprising: a lower tube with a base at its bottom; an upper tube slidably disposed within the lower tube; and a positioning device disposed between the lower and upper tubes, capable of positioning the upper tube at the adjusted height. The positioning device includes a guide rail and a positioning element. The guide rail is disposed at the bottom of the lower tube and extends from the base of the lower tube toward the upper tube. The guide rail has a longitudinally extending track, a first positioning groove extending laterally at the top of the track, and a second positioning groove extending laterally at the bottom of the track. The positioning element is disposed at the bottom of the upper tube and partially located within the track of the guide rail. The positioning element can selectively move to either the first or the second positioning groove.

[0008] In one embodiment of this utility model, the seat tube further includes an elastic device, which is disposed between the upper tube and the positioning device, so that the upper tube can rise automatically.

[0009] In one embodiment of this utility model, the elastic device includes a first spring seat, a second spring seat, and a compression spring. The first spring seat is located at the top of the upper tube, the second spring seat is located at the top of the guide rail, and the compression spring is located between the first spring seat and the second spring seat.

[0010] In one embodiment of this utility model, the outer periphery of the first spring seat has a spiral concave arc groove profile, and the outer periphery of the second spring seat has a spiral concave arc groove profile. The two ends of the compression spring are respectively sleeved on the outside of the first spring seat and the outside of the second spring seat, and the spring wires at both ends of the compression spring are fitted into the spiral concave arc grooves of the first spring seat and the second spring seat. The first spring seat is fixed to the top of the upper tube by a fastener, and the second spring seat abuts against the top of the guide rail due to the compression spring.

[0011] In one embodiment of this utility model, the elastic device is a cartridge, which is located between the upper tube and the positioning device, so that the upper tube can rise automatically. The cylinder of the cartridge is fixed to the base through a nut, and the cylinder rod of the cartridge is fixed to the top of the upper tube through a nut. One end of the cartridge is provided with a valve, which can move between the open position and the closed position.

[0012] In one embodiment of this utility model, the guide rail is a hollow tube extending inside the upper tube. The base is fixed with a fixing member. The fixing member and the bottom of the guide rail are fitted with a non-circular contour, so that the fixing member cannot rotate relative to the lower tube. A bearing sleeve is also provided between the lower tube and the guide rail, so that the guide rail can maintain a fixed radial distance with the lower tube. When the upper tube moves axially relative to the lower tube, the positioning member can move within the track. When the upper tube rotates relative to the lower tube, the positioning member can selectively move to the first positioning groove or the second positioning groove.

[0013] In one embodiment of this utility model, at least one key and at least one keyway are provided between the lower tube and the upper tube, so that the upper tube can only move axially relative to the lower tube and cannot rotate relative to it. The guide rail is hollow and extends inside the upper tube. A bearing is provided between the lower tube and the guide rail, so that the guide rail can rotate relative to the lower tube and maintain a fixed radial distance between the guide rail and the lower tube. The base is provided with a slider, which can move axially relative to the base but cannot rotate relative to it. The slider is provided with a radially protruding slide bar. A 45-degree inclined groove is opened at the bottom of the guide rail relative to the slide bar, and the groove allows the slide bar to slide partially inside.

[0014] In one embodiment of the present invention, at least one first limiting part is formed near the track in the first positioning groove, so that the positioning member located in the first positioning groove will not arbitrarily leave the first positioning groove; at least one second limiting part is formed near the track in the second positioning groove, so that the positioning member located in the second positioning groove will not arbitrarily leave the second positioning groove.

[0015] In one embodiment of this utility model, a sliding part is formed at the bottom of the track near the second positioning groove, so that the positioning member can automatically slide into the second positioning groove when the track moves downward and contacts the sliding part.

[0016] In one embodiment of the present invention, the guide rail further includes a plurality of third positioning grooves, each of which is located between the first positioning groove and the second positioning groove and is evenly distributed at equal intervals.

[0017] In one embodiment of this utility model, a bushing is provided between the bottom of the upper tube and the lower tube, a bushing is provided between the top of the lower tube and the upper tube, a dustproof ring is provided at the top of the lower tube, and a buffer ring is provided at the bottom of the lower tube relative to the bottom of the upper tube.

[0018] By rotating the upper tube relative to the lower tube, the positioning component enters the track, which allows the upper tube to move axially relative to the lower tube, thus adjusting the lifting seat tube. Afterward, rotating the upper tube relative to the lower tube keeps the positioning component in the first or second positioning groove, achieving the effect of positioning the upper tube at the adjusted height. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0020] Figure 1 This is a cross-sectional schematic diagram of the seat tube of this utility model, showing that the upper tube is located inside the lower tube.

[0021] Figure 2This is a schematic diagram showing the usage status of the seat tube of this utility model, indicating the status of the positioning device.

[0022] Figure 3 This is an embodiment diagram of the seat tube of this utility model, showing that the positioning device is driven by a slider.

[0023] Figure 4 yes Figure 3 The diagram shows the usage status of the positioning device, which is driven by the slider.

[0024] Figure 5 This is an embodiment of the guide rail of this utility model, showing that the guide rail has a multi-segment positioning function.

[0025] Figure 6 This is an embodiment diagram of the seat tube of this utility model, showing that the seat tube has a stepless positioning function.

[0026] The correspondence between the reference numerals and component names is as follows: 100. Seat tube; 10. Lower tube; 11. Base; 12. Bushing; 13. Dustproof ring; 14. Buffer ring; 15. Fixing component; 16. Bearing sleeve; 17. Bearing; 18. Slider; 181. Sliding rod; 20. Upper tube; 21. Locking part; 22. Bushing; 23. Key; 24. Keyway; 30. Positioning device; 31. Guide rail; 311. Track; 312. First positioning groove; 313. Second positioning groove; 314. First limiting part; 31 5. Second limiting part; 316. Sliding part; 32. Positioning component; 33. Slide groove; 34. Third positioning groove; 40. Elastic device; 41. First spring seat; 42. Second spring seat; 43. Compression spring; 44. Fastener; 45. Casing; 451. Cylinder body; 452. Nut; 453. Cylinder rod; 454. Nut; 455. Valve; 90. Steel cable; P1. Position 1; P2. Position 2; P3. Position 3; P4. Position 4. Detailed Implementation

[0027] The exemplary embodiments of the present invention are described in detail below with reference to the accompanying drawings. It is not intended to limit the technical principles of the present invention to the specific disclosed embodiments, but rather the scope of the present invention is limited only by the scope of the claims, covering alternatives, modifications, and equivalents. Furthermore, for the purpose of understanding and reading by those skilled in the art, the structural dimensions and sizes of the components presented in the drawings are shown in a schematic manner and are not intended to limit the implementation conditions of the present invention.

[0028] Please see Figures 1 to 2 As shown, this utility model provides a seat tube 100, which includes a lower tube 10, an upper tube 20 and a positioning device 30.

[0029] The lower tube 10 is a hollow tube that can be inserted into the bicycle's seat tube (not shown in the figure). The bottom of the lower tube 10 is provided with a base 11.

[0030] The upper tube 20 is slidably disposed within the lower tube 10. A locking portion 21 is formed at the top of the upper tube 20, which can engage with the bicycle saddle (not shown). A bushing 22 is provided between the bottom of the upper tube 20 and the lower tube 10, and a bushing 12 is provided between the top of the lower tube 10 and the upper tube 20, making the sliding between the upper tube 20 and the lower tube 10 smoother. A dustproof ring 13 is provided at the top of the lower tube 10 to scrape away dust and dirt from the outer surface of the upper tube 20, thereby increasing the service life of the sliding between the upper tube 20 and the lower tube 10. A buffer ring 14 is also provided at the bottom of the lower tube 10 relative to the bottom of the upper tube 20, which can absorb the impact when the upper tube 20 descends to the bottom of the lower tube 10.

[0031] The positioning device 30 is located between the lower tube 10 and the upper tube 20, and enables the upper tube 20 to be positioned at the adjusted height. The positioning device 30 includes a guide rail 31 and a positioning element 32. Please refer to the above description. Figure 1 and Figure 2 , Figure 2 for Figure 1 The cross-sectional view taken after rotating 90 degrees along the axis clearly shows the relative positions of the positioning element 32 and the guide rail 31.

[0032] The guide rail 31 is located at the bottom of the lower tube 10 and extends from the base 11 of the lower tube 10 toward the upper tube 20. In this embodiment, the guide rail 31 is hollow and extends inside the upper tube 20. The base 11 is fixedly provided with a fixing member 15. The fixing member 15 and the bottom of the guide rail 31 are fitted with a non-circular contour, so that the fixing member 15 cannot rotate relative to the lower tube 10. A sleeve 16 is also provided between the lower tube 10 and the guide rail 31, so that the guide rail 31 can maintain a fixed radial distance from the lower tube 10. The guide rail 31 is provided with a longitudinally extending track 311, a transversely extending first positioning groove 312 at the top of the track 311, and a transversely extending second positioning groove 313 at the bottom of the track 311.

[0033] The positioning element 32 is disposed at the bottom of the upper tube 20, and is partially located within the track 311 of the guide rail 31. When the upper tube 20 moves axially relative to the lower tube 10, the positioning element 32 can move within the track 311. When the upper tube 20 rotates relative to the lower tube 10, the positioning element 32 can selectively move to the first positioning groove 312 or the second positioning groove 313. In this embodiment, the positioning element 32 is in the shape of a round rod.

[0034] At least one first limiting part 314 is formed in the first positioning groove 312 near the track 311 to prevent the positioning member 32 located in the first positioning groove 312 from arbitrarily disengaging from the first positioning groove 312. At least one second limiting part 315 is formed in the second positioning groove 313 near the track 311 to prevent the positioning member 32 located in the second positioning groove 313 from arbitrarily disengaging from the second positioning groove 313. To make the positioning member 32 leave the first positioning groove 312, the upper tube 20 is rotated relative to the lower tube 10. The rotational force applied to the upper tube 20 must be large enough to make the positioning member 32 pass over the first limiting part 314 and enter the track 311. At this time, the positioning member 32 can move longitudinally within the track 311, and the upper tube 20 can move axially relative to the lower tube 10, for example, by descending. When the positioning element 32 moves to the bottom of the track 311, the upper tube 20 rotates relative to the lower tube 10, causing the positioning element 32 to enter the second positioning groove 313. At this time, the descent of the upper tube 20 is completed, and the positioning element 32 is held in the second positioning groove 313, achieving the effect of positioning the upper tube 20 at the adjusted height. Moreover, the second limiting part 315 can prevent the positioning element 32 from arbitrarily disengaging from the second positioning groove 313, providing a safe anti-accidental disengagement function.

[0035] Conversely, to disengage the positioning member 32 from the second positioning groove 313, the upper tube 20 is rotated relative to the lower tube 10. The rotational force applied to the upper tube 20 must be large enough to allow the positioning member 32 to pass the second limiting part 315 and enter the track 311. At this point, the positioning member 32 can move longitudinally within the track 311, and the upper tube 20 can move axially relative to the lower tube 10, for example, in an upward motion. When the positioning member 32 moves to the top of the track 311, the upper tube 20 is rotated relative to the lower tube 10, causing the positioning member 32 to enter the first positioning groove 312. This completes the upward motion of the upper tube 20 and keeps the positioning member 32 in the first positioning groove 312, achieving the effect of positioning the upper tube 20 at the adjusted height. Furthermore, the first limiting part 314 prevents the positioning member 32 from arbitrarily disengaging from the first positioning groove 312, providing a safe anti-accidental disengagement function.

[0036] In this embodiment, the seat tube 100 further includes an elastic device 40, which is disposed between the upper tube 20 and the positioning device 30, enabling the upper tube 20 to rise automatically. The elastic device 40 includes a first spring seat 41, a second spring seat 42, and a compression spring 43. The first spring seat 41 is disposed at the top of the upper tube 20, the second spring seat 42 is disposed at the top of the guide rail 31, and the compression spring 43 is disposed between the first spring seat 41 and the second spring seat 42. The compression spring 43 provides a force for the first spring seat 41 to move away from the second spring seat 42, thereby enabling the upper tube 20 to have an automatic rising force. The first spring seat 41 is fixed to the top of the upper tube 20 by a fastener 44, and the second spring seat 42 abuts against the top of the guide rail 31 due to the compression spring 43.

[0037] The outer periphery of the first spring seat 41 has a spiral concave arc groove outline, and the outer periphery of the second spring seat 42 has a spiral concave arc groove outline. The two ends of the compression spring 43 are respectively sleeved on the outside of the first spring seat 41 and the second spring seat 42, and the spring wires at both ends of the compression spring 43 are engaged in the spiral concave arc grooves of the first spring seat 41 and the second spring seat 42, thereby achieving a stable engagement effect.

[0038] Because the elastic device 40 gives the upper tube 20 an automatic upward force, in the natural state (meaning without external force), the positioning member 32 located in the first positioning groove 312 is lifted along with the upper tube 20 by the compression spring 43, causing the positioning member 32 to contact the top of the first positioning groove 312; as Figure 2 As indicated by the label P1, the first limiting part 314 prevents the positioning member 32 from arbitrarily disengaging from the first positioning groove 312, providing a safe anti-accidental disengagement function. In the riding state, the rider's weight slightly compresses the compression spring 43, causing the positioning member 32 within the first positioning groove 312 to contact the bottom of the first positioning groove 312; as... Figure 2 As shown in position P2, the first limiting part 314 can prevent the positioning member 32 from arbitrarily disengaging from the first positioning groove 312, and has a safe anti-accidental disengagement function.

[0039] Similarly, because the elastic device 40 gives the upper tube 20 an automatic upward force, in its natural state, the positioning member 32 located in the second positioning groove 313 is lifted along with the upper tube 20 by the compression spring 43, causing the positioning member 32 to contact the top of the second positioning groove 313; as Figure 2 As indicated by reference numeral P3, the second limiting part 315 prevents the positioning member 32 from arbitrarily disengaging from the second positioning groove 313, providing a safe anti-accidental disengagement function. In the riding position, the rider's weight slightly compresses the compression spring 43, causing the positioning member 32 within the second positioning groove 313 to contact the bottom of the second positioning groove 313; as... Figure 2 As shown in position 4P4, the second limiting part 315 can prevent the positioning member 32 from arbitrarily disengaging from the second positioning groove 313, and has a safe anti-accidental disengagement function.

[0040] To disengage the positioning member 32 from the first positioning groove 312, the upper tube 20 is rotated relative to the lower tube 10. In a natural state, the upper tube 20 (or the seat) can be rotated by hand; in a riding state, the seat (not shown) can be rotated by the hips or inner thigh muscles to rotate the upper tube 20. The rotational force applied to the upper tube 20 must be large enough to cause the positioning member 32 to pass the first limiting part 314 and enter the track 311; at this time, a downward force is applied to compress the compression spring 43 of the elastic device 40, which enables the positioning member 32 to move longitudinally within the track 311 and allows the upper tube 20 to move axially relative to the lower tube 10, for example, in a descending motion. When the positioning member 32 moves to the bottom of the track 311, the upper tube 20 rotates relative to the lower tube 10, causing the positioning member 32 to enter the second positioning groove 313; the elastic device 40 makes the positioning member 32 contact the top of the second positioning groove 313; at this time, the descent of the upper tube 20 is completed, and the positioning member 32 is held in the second positioning groove 313, achieving the effect of positioning the upper tube 20 at the adjusted height. Moreover, the second limiting part 315 can prevent the positioning member 32 from arbitrarily disengaging from the second positioning groove 313, providing a safe anti-accidental disengagement function. In this embodiment, a sliding part 316 is formed at the bottom of the track 311 near the second positioning groove 313, so that the positioning member 32 can automatically slide into the second positioning groove 313 when the track 311 moves downward and contacts the sliding part 316, achieving the effect of quickly positioning the upper tube 20 at the lowest position.

[0041] Conversely, to disengage the positioning member 32 from the second positioning groove 313, the upper tube 20 is rotated relative to the lower tube 10. In a natural state, the upper tube 20 (or the seat) can be rotated by hand. In a riding state, the seat (not shown) can be rotated by the hips or inner thigh muscles to rotate the upper tube 20. The rotational force applied to the upper tube 20 must be large enough to cause the positioning member 32 to pass the second limit part 315 and enter the track 311. At this time, the reset force stored in the compression spring 43 of the elastic device 40 can cause the positioning member 32 to move automatically longitudinally within the track 311 and cause the upper tube 20 to move automatically axially relative to the lower tube 10, for example, to rise automatically. When the positioning member 32 moves to the top of the track 311, the upper tube 20 is rotated relative to the lower tube 10, causing the positioning member 32 to enter the first positioning groove 312. At this time, the automatic rising action of the upper tube 20 is completed, and the positioning member 32 is held in the first positioning groove 312, achieving the effect of positioning the upper tube 20 at the adjusted height. Furthermore, the first limiting part 314 can prevent the positioning member 32 from arbitrarily disengaging from the first positioning groove 312, thus providing a safe anti-accidental disengagement function.

[0042] like Figure 3 and Figure 4The diagram shows one embodiment of the present invention. This embodiment is largely the same as the previous embodiments, therefore, the same components are still represented by the same reference numerals, and the same reference numerals are referred to in the drawings of the previous embodiments. The difference in this embodiment is that at least one key 23 and at least one keyway 24 are provided between the lower tube 10 and the upper tube 20, so that the upper tube 20 can only move axially relative to the lower tube 10 and cannot rotate relative to it. A bearing 17 is provided between the lower tube 10 and the guide rail 31, so that the guide rail 31 can rotate relative to the lower tube 10 and maintains a fixed radial distance between the guide rail 31 and the lower tube 10. The base 11 of the lower tube 10 is provided with a slider 18, which can move axially relative to the base 11 but cannot rotate relative to it. The slider 18 is provided with a radially protruding slider 181, and the bottom of the guide rail 31 is provided with a 45-degree inclined groove 33 relative to the slider 181, the groove 33 allowing the slider 181 to slide partially within it. The slider 18 can be driven by being pulled down by a steel cable 90. When the slider 18 moves downward axially, the slider 181 moves downward and slides relative to the groove 33. The inclined groove 33 allows the guide rail 31 to rotate relative to the upper tube 20. Therefore, it can also achieve the function of allowing the positioning member 32 to leave the first positioning groove 312 or enter the first positioning groove 312, producing the same effect as the aforementioned embodiment.

[0043] To move the positioning element 32 away from the first positioning groove 312, operate the steel cable 90 to move the slider 18 downward axially. The guide rail 31 rotates relative to the upper tube 20, causing the positioning element 32 to pass the first limiting part 314 and enter the track 311. At this time, apply a downward force to compress the compression spring 43 of the elastic device 40, which allows the positioning element 32 to move longitudinally within the track 311 and the upper tube 20 to move axially relative to the lower tube 10, for example, in a descending motion. When the positioning element 32 moves to the bottom of the track 311, operate the steel cable 90 to move the slider 18 upward to its original position. The guide rail 31 rotates relative to the upper tube 20, causing the positioning element 32 to enter the second positioning groove 313. The elastic device 40 makes the positioning element 32 contact the top of the second positioning groove 313. At this time, the descending motion of the upper tube 20 is completed, and the positioning element 32 is held in the second positioning groove 313, achieving the effect of positioning the upper tube 20 at the adjusted height. Furthermore, the second limiting part 315 can prevent the positioning member 32 from arbitrarily disengaging from the second positioning groove 313, thus providing a safe anti-accidental disengagement function.

[0044] Conversely, to move the positioning element 32 away from the second positioning groove 313, the steel cable 90 is operated to move the slider 18 downward axially. The guide rail 31 rotates relative to the upper tube 20, causing the positioning element 32 to pass the second limiting part 315 and enter the track 311. At this time, the reset force stored in the compression spring 43 of the elastic device 40 enables the positioning element 32 to move automatically longitudinally within the track 311, and also enables the upper tube 20 to move automatically axially relative to the lower tube 10, for example, to automatically rise. When the positioning element 32 moves to the top of the track 311, the steel cable 90 is operated to move the slider 18 upward to its original position. The guide rail 31 rotates relative to the upper tube 20, causing the positioning element 32 to enter the first positioning groove 312. At this time, the automatic rising action of the upper tube 20 is completed, and the positioning element 32 is held in the first positioning groove 312, achieving the effect of positioning the upper tube 20 at the adjusted height. Furthermore, the first limiting part 314 can prevent the positioning member 32 from arbitrarily disengaging from the first positioning groove 312, thus providing a safe anti-accidental disengagement function.

[0045] like Figure 5 The diagram illustrates one embodiment of the present invention. This embodiment is largely the same as the previous embodiments; therefore, identical components are still represented by the same reference numerals, which can be found in the drawings of the previous embodiments. The difference in this embodiment is that the guide rail 31 further includes multiple third positioning grooves 34, each located between the first positioning groove 312 and the second positioning groove 313, and evenly spaced. This design provides multi-segment positioning height, achieving the effect of multi-segment height adjustment.

[0046] like Figure 6 The diagram illustrates one embodiment of the present invention. This embodiment is largely the same as the previous embodiments; therefore, identical components are still represented by the same reference numerals, which can be found in the drawings of the previous embodiments. The difference in this embodiment is that the elastic device 40 uses a readily available cartridge 45 (i.e., a pneumatic rod) to provide the function of automatically raising the upper tube 20. The elastic device 40 is located between the upper tube 20 and the positioning device 30, enabling the upper tube 20 to rise automatically. The cylinder 451 of the cartridge 45 is fixed to the base 11 of the lower tube 10 through a nut 452. The cylinder rod 453 of the cartridge 45 is fixed to the top of the upper tube 20 through a nut 454. A valve 455 is provided at one end of the cartridge 45. The valve 455 can move between an open position and a closed position. The valve 455 can be controlled manually or by a motor. When valve 455 is in the open position, cylinder rod 453 can automatically raise the upper pipe 20, or apply force downward to press the upper pipe 20, causing cylinder rod 453 to retract into cylinder body 451, thus lowering the upper pipe 20. When valve 455 is in the closed position, cylinder rod 453 cannot move relative to cylinder body 451, fixing the upper pipe 20 at the required height, thereby enabling the upper pipe 20 to be continuously fixed at the required height.

[0047] The embodiments described above are merely illustrative of the present invention and are not intended to limit the scope of the present invention. All modifications or variations made without departing from the spirit of the present invention are within the scope of protection intended by the present invention.

Claims

1. A seat tube for a bicycle having a rotating upper tube for adjusting the height of the seat tube, characterized in that, include: The lower tube has a base at its bottom. The upper tube is slidably disposed inside the lower tube; as well as A positioning device is provided between the lower tube and the upper tube, and is capable of positioning the upper tube at an adjusted height. The positioning device includes a guide rail and a positioning element. The guide rail is located at the bottom of the lower tube and extends from the base toward the upper tube. The guide rail has a longitudinally extending track. The top of the track has a transversely extending first positioning groove, and the bottom of the track has a transversely extending second positioning groove. The positioning element is located at the bottom of the upper tube, and is partially located within the track. The positioning element can selectively move to the first positioning groove or the second positioning groove.

2. The rotating upper tube adjustment riser seat tube of claim 1, wherein, The seat tube also includes an elastic device, which is located between the upper tube and the positioning device, so that the upper tube can rise automatically.

3. The rotating upper tube adjustment riser seat tube of claim 2, wherein, The elastic device includes a first spring seat, a second spring seat, and a compression spring. The first spring seat is located at the top of the upper tube, the second spring seat is located at the top of the guide rail, and the compression spring is located between the first spring seat and the second spring seat.

4. The rotating upper tube adjustment riser seat tube of claim 3, wherein, The outer periphery of the first spring seat has a spiral concave arc groove profile, and the outer periphery of the second spring seat has a spiral concave arc groove profile. The two ends of the compression spring are respectively sleeved on the outside of the first spring seat and the outside of the second spring seat, and the spring wires at both ends of the compression spring are engaged in the spiral concave arc grooves of the first spring seat and the second spring seat. The first spring seat is fixed to the top of the upper tube by a fastener, and the second spring seat abuts against the top of the guide rail due to the compression spring.

5. The rotating upper tube adjustment riser seat tube of claim 2, wherein, The elastic device is a cartridge, which is located between the upper tube and the positioning device, allowing the upper tube to rise automatically. The cylinder of the cartridge is fixed to the base through a nut, and the cylinder rod of the cartridge is fixed to the top of the upper tube through a nut. One end of the cartridge is provided with a valve, which can move between an open position and a closed position.

6. The rotating upper tube adjustment riser seat tube of claim 1, wherein, The guide rail is a hollow tube extending inside the upper tube. The base is fixed with a fixing member. The fixing member and the bottom of the guide rail are fitted with a non-circular contour, so that the fixing member cannot rotate relative to the lower tube. A sleeve is also provided between the lower tube and the guide rail, so that the guide rail can maintain a fixed radial distance from the lower tube. When the upper tube moves axially relative to the lower tube, the positioning member can move within the track. When the upper tube rotates relative to the lower tube, the positioning member can selectively move to the first positioning groove or the second positioning groove.

7. The rotating upper tube adjustment riser seat tube of claim 1, wherein, At least one key and at least one keyway are provided between the lower tube and the upper tube, so that the upper tube can only move axially relative to the lower tube and cannot rotate relative to it. The guide rail is hollow and extends inside the upper tube. A bearing is provided between the lower tube and the guide rail, so that the guide rail can rotate relative to the lower tube and maintain a fixed radial distance between the guide rail and the lower tube. The base is provided with a slider, which can move axially relative to the base but cannot rotate relative to it. The slider is provided with a radially protruding slide bar. The bottom of the guide rail is provided with a 45-degree inclined groove relative to the slide bar, and the groove allows the slide bar to slide partially inside it.

8. The rotating upper tube adjustment riser seat tube of claim 1, wherein, The first positioning groove has at least one first limiting part formed near the track, so that the positioning member located in the first positioning groove will not arbitrarily leave the first positioning groove. The second positioning groove has at least one second limiting part formed near the track, so that the positioning member located in the second positioning groove will not arbitrarily leave the second positioning groove.

9. The rotating upper tube adjustment riser seat tube of claim 8, wherein, A sliding part is formed at the bottom of the track near the second positioning groove, so that the positioning member can automatically slide into the second positioning groove when the track moves downward and contacts the sliding part.

10. The rotating upper tube adjustment riser seat tube of claim 8, wherein, The guide rail also includes a plurality of third positioning grooves, each of which is located between the first positioning groove and the second positioning groove, and is evenly distributed at equal intervals.

11. The rotating upper tube adjustment riser seat tube of claim 8, wherein, A bushing is provided between the bottom of the upper tube and the lower tube, a bushing is provided between the top of the lower tube and the upper tube, a dustproof ring is provided at the top of the lower tube, and a buffer ring is provided at the bottom of the lower tube relative to the bottom of the upper tube.

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