Lifting seat tube capable of adjusting maximum rising stroke

Abstract

The invention relates to a lifting seat tube. The lifting seat tube comprises an outer tube, an inner tube, a gas-oil hydraulic cylinder and a stroke adjusting assembly, the inner pipe penetrates through the outer pipe and can move up and down, the gas-oil hydraulic cylinder is arranged in the outer pipe, when the gas-oil hydraulic cylinder is opened, the inner pipe can move up and down relative to the outer pipe, and when the gas-oil hydraulic cylinder is closed, the inner pipe cannot move up and down relative to the outer pipe; the oil guide pipe is arranged in the inner pipe, the bottom end of the oil guide pipe is arranged in the gas-oil hydraulic cylinder in a penetrating mode, when the oil guide pipe outputs or flows back an oil body when the gas-oil hydraulic cylinder is opened, the floating piston moves corresponding to the capacity of the oil body, and then the maximum stroke amount of the inner pipe capable of moving up and down relative to the outer pipe is adjusted.

Description

Technical Field

[0001] The present invention relates to a lift seat tube, and more particularly to a lift seat tube with adjustable maximum rising stroke. Background Art

[0002] The height of the bicycle seat affects the comfort and safety during riding. Therefore, currently, an adjustable seat tube is configured in the structure to adjust the seat height according to the rider's body type, riding habits, and riding environment, enabling the rider to ride in the correct posture, thereby improving riding comfort and safety.

[0003] However, although the adjustable seat tube can reduce the height of the inner tube to achieve the effect of saving storage space, after the height of the inner tube is adjusted downwards, it will take time to readjust the seat height suitable for oneself during the next use, thus causing inconvenience and trouble to the rider in use. Summary of the Invention

[0004] The main object of the present invention is to provide a lift seat tube that can adjust the maximum rising stroke according to actual needs.

[0005] To achieve the above main object, the lift seat tube of the present invention includes an outer tube, an inner tube, a gas-oil cylinder, and a stroke adjustment component. The inner tube is vertically movably inserted into the outer tube, and the inner tube has a top end and a bottom end. The top end of the inner tube extends out of the outer tube, and the bottom end of the inner tube is located inside the outer tube. The gas-oil cylinder is disposed inside the outer tube to control the vertical movement of the inner tube relative to the outer tube. When the gas-oil cylinder is opened, the inner tube can move up and down relative to the outer tube. When the gas-oil cylinder is closed, the inner tube cannot move up and down relative to the outer tube. The stroke adjustment component has an oil guiding tube and a floating piston. The oil guiding tube is disposed inside the inner tube, and the oil guiding tube has a first oil guiding end, a second oil guiding end, and an oil guiding channel located between the first oil guiding end and the second oil guiding end. The first oil guiding end is fixed to the top end of the inner tube, the second oil guiding end penetrates into the gas-oil cylinder, and the floating piston is movably disposed inside the gas-oil cylinder. When the oil guiding tube outputs or returns an oil body from the second oil guiding end, the floating piston moves corresponding to the volume of the oil body, thereby adjusting the maximum stroke amount that the inner tube can move up and down relative to the outer tube.

[0006] As described above, when adjusting the maximum upward stroke of the inner tube, first open the pneumatic-oil cylinder and press down the inner tube so that it exceeds the adjustable stroke, then close the pneumatic-oil cylinder. Next, inject the oil body from the first oil guiding end of the oil guiding pipe, so that the oil body flows through the oil guiding channel to the second oil guiding end and is output from the second oil guiding end. At this time, the floating piston will move according to the volume of the oil body. After that, open the pneumatic-oil cylinder again and release the inner tube. During the rebound and upward movement of the inner tube, it can be positioned by the position of the floating piston, thus completing the adjustment of the maximum upward stroke.

[0007] Conversely, when restoring the original maximum upward stroke, first open the pneumatic-oil cylinder and press down the inner tube so that it exceeds the adjustable stroke, then close the pneumatic-oil cylinder. Next, let the oil body flow back from the second oil guiding end of the oil guiding pipe. At this time, the floating piston will return to its original position. After that, open the pneumatic-oil cylinder again and release the inner tube, thus completing the restoration of the maximum upward stroke.

[0008] Preferably, the pneumatic-oil cylinder has an inner cylinder body, an outer cylinder body and a top cover. The inner cylinder body is arranged inside the outer cylinder body and is spaced from the outer cylinder body. The top cover is arranged at the top of the inner cylinder body and the outer cylinder body. The second oil guiding end of the oil guiding pipe passes through the top cover and is located in the inner cylinder body. The floating piston is arranged between the top cover and the second oil guiding end of the oil guiding pipe. When the oil guiding pipe outputs the oil body from the second oil guiding end when the pneumatic-oil cylinder is open, the floating piston moves in a direction away from the second oil guiding end of the oil guiding pipe. When the oil guiding pipe allows the oil body to flow back from the second oil guiding end when the pneumatic-oil cylinder is open, the floating piston moves in the direction of the second oil guiding end of the oil guiding pipe.

[0009] Preferably, the top end of the inner tube has a first oil chamber and a second oil chamber communicating with the first oil chamber. The second oil chamber is axially communicated with the first oil guiding end of the oil guiding pipe.

[0010] Preferably, the top end of the inner tube also has a screw hole communicating with the first oil chamber. The stroke adjustment assembly further has a knob, which is arranged in the screw hole in a screwed manner to output the oil body in the first oil chamber to the second oil chamber or allow the oil body in the second oil chamber to flow back to the first oil chamber.

[0011] Preferably, the inner tube has an adjustment hole axially penetrating the top end. The first oil guiding end of the oil guiding pipe is screwed into the adjustment hole. The stroke adjustment assembly further has an adjustment screw, which is located in the oil guiding channel and is arranged in the first oil guiding end of the oil guiding pipe in a screwed manner to output the oil body in the oil guiding channel to the second oil guiding end or allow the oil body to flow back from the second oil guiding end to the oil guiding channel.

[0012] Preferably, the inner cylinder body has an inner oil chamber. An air chamber is formed between the top cover, the inner cylinder body, and the outer cylinder body. The pneumatic oil cylinder further has a bottom cover and a control valve. The bottom cover is disposed at the bottom ends of the inner cylinder body and the outer cylinder body and forms an outer oil chamber below the air chamber between the inner cylinder body and the outer cylinder body. The control valve is disposed in the inner cylinder body. When the control valve is in an open valve position, the inner oil chamber and the outer oil chamber communicate with each other, enabling the inner tube to move up and down relative to the outer tube. When the control valve is in a closed valve position, the inner oil chamber and the outer oil chamber do not communicate with each other, preventing the inner tube from moving up and down relative to the outer tube.

[0013] Preferably, the pneumatic oil cylinder has an inner cylinder body, an outer cylinder body, a top cover, a bottom cover, and a control valve. The inner cylinder body has an inner oil chamber, and the inner cylinder body is disposed inside the outer cylinder body with a gap therebetween. The top cover is disposed at the top ends of the inner cylinder body and the outer cylinder body and forms an air chamber between the inner cylinder body and the outer cylinder body. The bottom cover is disposed at the bottom ends of the inner cylinder body and the outer cylinder body and forms an outer oil chamber below the air chamber between the inner cylinder body and the outer cylinder body. The control valve is disposed in the inner cylinder body. When the control valve is in an open valve position, the inner oil chamber and the outer oil chamber communicate with each other, enabling the inner tube to move up and down relative to the outer tube. When the control valve is in a closed valve position, the inner oil chamber and the outer oil chamber do not communicate with each other, preventing the inner tube from moving up and down relative to the outer tube. The second oil guiding end of the oil guiding tube passes through the top cover and is located in the inner cylinder body. The floating piston is disposed in the inner oil chamber between the second oil guiding end of the oil guiding tube and the control valve, dividing the inner oil chamber into an upper oil area and a lower oil area. When the oil guiding tube outputs the oil body from the second oil guiding end when the control valve is in the open valve position, the floating piston moves in a direction away from the second oil guiding end of the oil guiding tube. When the oil guiding tube returns the oil body from the second oil guiding end when the control valve is in the open valve position, the floating piston moves in a direction towards the second oil guiding end of the oil guiding tube.

[0014] Preferably, the pneumatic oil cylinder has an inner cylinder body, an outer cylinder body, a top cover, a bottom cover and a control valve. The inner cylinder body has an inner oil chamber, and the inner cylinder body is disposed inside the outer cylinder body and is spaced apart from the outer cylinder body. The top cover is disposed at the top of the inner cylinder body and the outer cylinder body and forms an air chamber between the inner cylinder body and the outer cylinder body. The bottom cover is disposed at the bottom of the inner cylinder body and the outer cylinder body and forms an outer oil chamber below the air chamber between the inner cylinder body and the outer cylinder body. The control valve is disposed in the inner cylinder body. When the control valve is in an open valve position, the inner oil chamber and the outer oil chamber communicate with each other, enabling the inner tube to move up and down relative to the outer tube. When the control valve is in a closed valve position, the inner oil chamber and the outer oil chamber do not communicate with each other, preventing the inner tube from moving up and down relative to the outer tube. The second oil guiding end of the oil guiding tube passes through the top cover and is located in the inner cylinder body. The floating piston is disposed between the inner cylinder body and the outer cylinder body and separates the air chamber and the outer oil chamber. When the oil guiding tube outputs the oil body from the second oil guiding end when the control valve is in the open valve position, the floating piston moves in a direction away from the bottom cover. When the oil guiding tube returns the oil body from the second oil guiding end when the control valve is in the open valve position, the floating piston moves in a direction towards the bottom cover.

[0015] Preferably, the pneumatic oil cylinder has an inner cylinder body, an outer cylinder body, a top cover, a bottom cover and a control valve. The inner cylinder body has an inner oil chamber, and the inner cylinder body is disposed inside the outer cylinder body and is spaced apart from the outer cylinder body. The top cover is disposed at the top of the inner cylinder body and the outer cylinder body and forms an air chamber between the inner cylinder body and the outer cylinder body. The bottom cover is disposed at the bottom of the inner cylinder body and the outer cylinder body and forms an outer oil chamber below the air chamber between the inner cylinder body and the outer cylinder body. The control valve is disposed in the inner cylinder body. When the control valve is in an open valve position, the inner oil chamber and the outer oil chamber communicate with each other, enabling the inner tube to move up and down relative to the outer tube. When the control valve is in a closed valve position, the inner oil chamber and the outer oil chamber do not communicate with each other, preventing the inner tube from moving up and down relative to the outer tube. The second oil guiding end of the oil guiding tube passes through the top cover and is located in the inner cylinder body. The stroke adjustment assembly has two such floating pistons. One of the floating pistons is disposed in the inner oil chamber and is located between the second oil guiding end of the oil guiding tube and the control valve, dividing the inner oil chamber into an upper oil area and a lower oil area. The other floating piston is disposed between the inner cylinder body and the outer cylinder body and separates the air chamber and the outer oil chamber. When the oil guiding tube returns the oil body from the second oil guiding end when the control valve is in the open valve position, the floating piston in the inner oil chamber moves in a direction towards the oil guiding tube, and the floating piston between the inner cylinder body and the outer cylinder body moves in a direction towards the bottom cover.

[0016] Preferably, the top end of the inner tube has a first oil chamber, a second oil chamber communicating with the first oil chamber, and a button hole communicating with the second oil chamber and the first oil guiding end; the stroke adjustment assembly further has a piston, a button and a reset elastic member. The piston is movably disposed in the first oil chamber for outputting the oil in the first oil chamber to the second oil chamber or allowing the oil in the second oil chamber to flow back to the first oil chamber. The button is movably disposed in the button hole and has a communication hole. Therefore, when the button is in an initial position, the second oil chamber and the first oil guiding end of the oil guiding pipe are blocked by the button and are not communicated with each other. When the button is in a pressed position, the second oil chamber and the first oil guiding end of the oil guiding pipe are communicated with each other through the communication hole, and the reset elastic member acts on the button and keeps the button in the initial position.

[0017] Details of the structure, features, assembly or usage of the lift seat tube with adjustable maximum lifting stroke provided by the present invention will be described in the subsequent detailed description of the embodiments. However, those of ordinary skill in the art of the present invention should understand that the detailed description and the specific embodiments listed for implementing the present invention are only used to illustrate the present invention and are not intended to limit the scope of the patent application of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a perspective view of the lift seat tube according to the first embodiment of the present invention.

[0019] Figure 2 is a sectional view of the lift seat tube according to the first embodiment of the present invention.

[0020] Figure 3 is Figure 2 a partial enlarged view, mainly showing the top end of the inner tube.

[0021] Figure 4 is Figure 3 a sectional view taken along the section line 4-4.

[0022] Figure 5 is Figure 2 a partial enlarged view, mainly showing the valve stem in the closed valve position.

[0023] Figure 6 is Figure 2 a partial enlarged view, mainly showing the second oil guiding member abutting against the floating piston.

[0024] Figure 7 Similar to Figure 5 , mainly showing the valve stem in the open valve position.

[0025] Figure 8 Similar to Figure 4 , mainly showing the knob being screwed inwards.

[0026] Figure 9 Similar to Figure 6 it mainly shows an oil chamber formed between the floating piston and the second oil guiding member.

[0027] Figure 10 Similar to Figure 2 it mainly shows the reduction of the maximum upward stroke of the inner tube.

[0028] Figure 11 It is a cross-sectional view of the lift seat tube according to the second embodiment of the present invention.

[0029] Figure 12 It is Figure 11 a partial enlarged view of

[0030] Figure 13 Similar to Figure 12 it mainly shows the adjusting screw being screwed downwards.

[0031] Figure 14 Similar to Figure 9 it mainly shows an oil chamber formed between the floating piston and the second oil guiding member.

[0032] Figure 15 Similar to Figure 1 it mainly shows the reduction of the maximum upward stroke of the inner tube.

[0033] Figure 16 It is a cross-sectional view of the lift seat tube according to the third embodiment of the present invention.

[0034] Figure 17 It is Figure 16 a partial enlarged view of

[0035] Figure 18 Similar to Figure 17 it mainly shows the button in the pressed position and the piston being pushed inwards.

[0036] Figure 19 Similar to Figure 18 it mainly shows the button in the pressed position and the piston being pushed outwards.

[0037] Figure 20 Similar to Figure 16 it mainly shows the reduction of the maximum upward stroke of the inner tube.

[0038] Figure 21 Similar to Figure 17 it mainly shows that the piston is provided with a hexagonal hole and the knob is omitted.

[0039] Figure 22 It is a cross-sectional view of the lift seat tube according to the fourth embodiment of the present invention.

[0040] Figure 23 Similar to Figure 22 it mainly shows that the downward pressure of the inner tube causes the outer floating piston to rise.

[0041] Figure 24 It is a partial cross-sectional view of the lifting seat tube according to the 3rd embodiment of the present invention, mainly showing that the knob is screwed outwards.

[0042] Figure 25 Similar to Figure 24 it mainly shows that one floating piston rises and the other floating piston descends.

[0043] Figure 26 Similar to Figure 25 it mainly shows that the floating piston descends to abut against the bottom cover.

[0044] Figure 27 Similar to Figure 22 it mainly shows the reduction of the maximum upward stroke of the inner tube.

[0045]

Explanation of the reference numerals of the drawings

[0046] 10: Lifting seat tube;

[0047] 12: Lifting seat tube;

[0048] 14: Lifting seat tube;

[0049] 16: Lifting seat tube;

[0050] 20: Outer tube;

[0051] 30: Inner tube;

[0052] 31: Top end;

[0053] 312: Ear;

[0054] 314: Countersunk hole;

[0055] 316: Channel;

[0056] 318: Button hole;

[0057] 32: Bottom end;

[0058] 33: First oil chamber;

[0059] 34: Second oil chamber;

[0060] O: Oil body;

[0061] 35: Adjusting screw hole;

[0062] 352: Inner stop portion;

[0063] 354: Outer ring groove;

[0064] 356: Outer retaining ring;

[0065] 36: Oil injection hole;

[0066] 37: Oil filling hole;

[0067] 38: Plug;

[0068] 39: Cover;

[0069] 40: Seat clamping device;

[0070] 41: Upper clamping seat;

[0071] 412: Upper clamping groove;

[0072] 414: Nut hole;

[0073] 42: Lower clamping seat;

[0074] 422: Lower clamping groove;

[0075] 43: Nut;

[0076] 44: Bolt;

[0077] 50: Pneumatic - hydraulic cylinder;

[0078] 502: Air chamber;

[0079] 504: Outer oil chamber;

[0080] 51: Inner cylinder body;

[0081] 512: Inner oil chamber;

[0082] 514: Upper oil area;

[0083] 516: Lower oil area;

[0084] 52: Outer cylinder body;

[0085] 53: Top cover;

[0086] 54: Bottom cover;

[0087] 55: Floating piston;

[0088] 56: Control valve;

[0089] 57: Valve seat;

[0090] 572: Valve hole;

[0091] 574: Upper oil guiding hole;

[0092] 576: Lower oil guiding hole;

[0093] 58: Valve stem;

[0094] 582: Outer flange;

[0095] P1: Valve opening position;

[0096] P2: Valve closing position;

[0097] 60: Stroke adjustment assembly;

[0098] 61: Knob;

[0099] 612: Threaded head;

[0100] 614: Body;

[0101] 616: Hexagonal hole;

[0102] 62: Oil guide pipe;

[0103] 622: First oil guide end;

[0104] 624: Second oil guide end;

[0105] 626: Oil guide channel;

[0106] 63: Floating piston;

[0107] 64: First oil guide part;

[0108] 642: First oil guide hole;

[0109] 65: Second oil guide part;

[0110] 652: Second oil guide hole;

[0111] 66: Third oil chamber;

[0112] 67: Piston;

[0113] 672: Hexagonal hole;

[0114] 68: Button;

[0115] 682: Communication hole;

[0116] P3: Initial position;

[0117] P4: Pressed position;

[0118] 69: Reset elastic part;

[0119] 70: Inner pipe;

[0120] 71: Top end;

[0121] 72: Adjustment hole;

[0122] 80: Stroke adjustment assembly;

[0123] 81: Oil guide pipe;

[0124] 812: First oil guiding end;

[0125] 82: Second oil guiding member;

[0126] 822: Second oil guiding hole;

[0127] 84: Adjusting screw;

[0128] 86: Third oil chamber;

[0129] 90: Stroke adjusting assembly;

[0130] 91: Floating piston;

[0131] 92: Floating piston. Detailed implementation manner

[0132] The applicant hereby states that in the whole specification, including the embodiments introduced below and the claims of the patent application scope, the directional nouns are based on the directions in the drawings. Secondly, in the embodiments and drawings to be introduced below, the same element numbers represent the same or approximate elements or their structural features.

[0133] Please refer to Figure 1 and Figure 2 , the lifting seat tube 10 of the first embodiment of the present invention includes an outer tube 20, an inner tube 30, a seat cushion clamping device 40, a pneumatic oil cylinder 50, and a stroke adjusting assembly 60.

[0134] The inner tube 30 is inserted into the outer tube 20 from the top end of the outer tube 20. The inner tube 30 has a top end 31 and a bottom end 32. The top end 31 of the inner tube 30 extends out of the outer tube 20, the bottom end 32 of the inner tube 30 is located inside the outer tube 20, and the top end 31 of the inner tube 30 has two ears 312, and each ear 312 has a countersunk hole 314 (as Figure 3 shown). In addition, in this embodiment, as Figure 3 and Figure 4 shown, the top end 31 of the inner tube 30 has a first oil chamber 33 and a second oil chamber 34. Both the first oil chamber 33 and the second oil chamber 34 are used to store an oil body O. The first oil chamber 33 extends along the radial direction of the inner tube 30, and the second oil chamber 34 extends along the axial direction of the inner tube 30 and communicates with the first oil chamber 33 through a channel 316. Again, as Figure 3 and Figure 4As shown, the top end 31 of the inner tube 30 further has an adjustment screw hole 35, an oil injection hole 36, and an oil filling hole 37. The adjustment screw hole 35 axially communicates with one end of the first oil chamber 33 and forms an inner stop portion 352 with the first oil chamber 33. An outer ring groove 354 is formed on the hole wall of the adjustment screw hole 35, and an outer stop ring 356 is embedded in the outer ring groove 354. The oil injection hole 36 radially communicates with the other end of the first oil chamber 33 and is closed by a plug 38. The oil filling hole 37 is opened on the top surface of the inner tube 30 and axially communicates with the second oil chamber 34, and a cover 39 is provided in the oil filling hole 37.

[0135] The seat cushion clamping device 40 has an upper clamping seat 41, a lower clamping seat 42, two nuts 43, and two bolts 44. As Figure 1 and Figure 3 shown, the bottom surfaces of two of the side edges of the upper clamping seat 41 respectively have an upper clamping groove 412, and the other two side edges of the upper clamping seat 41 respectively have a nut hole 414; the top surfaces of two of the side edges of the lower clamping seat 42 respectively have a lower clamping groove 422 corresponding to the upper clamping groove 412; the nuts 43 are arranged in the nut holes 414 of the upper clamping seat 41; the bolts 44 pass through the counterbore holes 314 from bottom to top and are screwed with the nuts 43. Therefore, after the seat cushion clamping device 40 is assembled, the oil filling hole 37 will be covered, and the two seat bows (not shown in the figure) of the seat cushion (not shown in the figure) are clamped by the upper clamping grooves 412 and the lower clamping grooves 422 to complete the assembly with the seat cushion.

[0136] The air-oil cylinder 50 has an inner cylinder body 51, an outer cylinder body 52, a top cover 53, a bottom cover 54, and a control valve 56. As Figure 2 shown, the inner cylinder body 51 has an inner oil chamber 512, and the inner cylinder body 51 is arranged inside the outer cylinder body 52 and is spaced from the outer cylinder body 52; the top cover 53 is arranged at the top ends of the inner cylinder body 51 and the outer cylinder body 52 and forms an air chamber 502 between the inner cylinder body 51 and the outer cylinder body 52; the bottom cover 54 is arranged at the bottom ends of the inner cylinder body 51 and the outer cylinder body 52 and forms an outer oil chamber 504 below the air chamber 502 between the inner cylinder body 51 and the outer cylinder body 52. The air chamber 502 and the outer oil chamber 504 are separated by a floating piston 55; as Figure 5 and Figure 7 shown, the control valve 56 has a valve seat 57 and a valve stem 58. The valve seat 57 is arranged on the bottom cover 54 and is located in the inner cylinder body 51. The valve seat 57 has a valve hole 572, a plurality of upper oil guide holes 574, and a plurality of lower oil guide holes 576. The upper oil guide holes 574 and the lower oil guide holes 576 all communicate with the valve hole 572. The valve stem 58 is movably arranged up and down in the valve hole 572 of the valve seat 57 and controls the communication of the upper oil guide holes 574 and the lower oil guide holes 576 with an outer flange 582. When the valve stem 58 is located at an open valve position P1 (as Figure 7When in the state shown in the figure, the outer flange 582 of the valve stem 58 allows the upper oil guiding hole 574 and the lower oil guiding hole 576 to communicate, enabling the inner oil chamber 512 and the outer oil chamber 504 to communicate with each other. At this time, the inner tube 30 can move up and down relative to the outer tube 20. When the valve stem 58 is in a valve closing position P2 (as shown in Figure 5 the figure), the outer flange 582 of the valve stem 58 blocks between the upper oil guiding hole 574 and the lower oil guiding hole 576, preventing the inner oil chamber 512 and the outer oil chamber 504 from communicating with each other. At this time, the inner tube 30 cannot move up and down relative to the outer tube 20. (For the further detailed structure and operation mode of the control valve 56, reference can be made to the patent case TWM616687 applied by the applicant of this case.)

[0137] The stroke adjustment assembly 60 has a knob 61, an oil guiding pipe 62 and a floating piston 63. As shown in Figure 4 the figure, the knob 61 has a threaded head 612 and a body 614 connecting the threaded head 612. The threaded head 612 is arranged in the adjustment screw hole 35 of the inner tube 30 in a screwed manner, and the body 614 penetrates into the first oil chamber 33. In addition, the knob 61 also has a hexagonal hole 616 recessed from the threaded head 612 towards the body 614 for a tool (such as a hexagonal wrench, not shown in the figure) to engage. When the knob 61 is driven by the aforementioned tool, it can move outwards at most until it abuts against the outer stop ring 356 or inwards until it abuts against the inner stop portion 352. As shown in Figure 2 、 Figure 3 and Figure 6 the figure, the oil guiding pipe 62 is arranged in the inner tube 30, and the oil guiding pipe 62 has a first oil guiding end 622, a second oil guiding end 624 and an oil guiding channel 626 located between the first oil guiding end 622 and the second oil guiding end 624. The first oil guiding end 622 of the oil guiding pipe 62 is connected to a first oil guiding member 64. The first oil guiding member 64 is screwed on the top end 31 of the inner tube 30 and has a first oil guiding hole 642 communicating the second oil chamber 34 and the oil guiding channel 626. The second oil guiding end 624 of the oil guiding pipe 62 passes through the top cover 53 and is connected to a second oil guiding member 65 located in the inner cylinder body 51. The second oil guiding member 65 has a plurality of second oil guiding holes 652 communicating the oil guiding channel 626. The floating piston 63 is located between the top cover 53 and the second oil guiding member 65 of the oil guiding pipe 62 and is penetrated by the second oil guiding end 624 of the oil guiding pipe 62 in this embodiment.

[0138] As can be seen from the above, when it is necessary to reduce the maximum rising stroke of the inner tube 30, first, open the pneumatic-hydraulic cylinder 50 (as shown in Figure 7 the figure) and press down the inner tube 30 so that it exceeds the adjustable stroke and then close the pneumatic-hydraulic cylinder 50 to temporarily position the inner tube 30. Then, screw the knob 61 inwards (as shown in Figure 8As shown in the figure, the oil body O in the first oil chamber 33 flows through the channel 316 to the second oil chamber 34, and then the oil body O enters the oil guiding channel 626 of the oil guiding pipe 62 from the second oil chamber 34 through the first oil guiding hole 642 of the first oil guiding member 64 (as Figure 3 shown in the figure), the oil body O flows through the oil guiding channel 626 to the second oil guiding hole 652 of the second oil guiding member 65, and then flows out from the second oil guiding hole 652 of the second oil guiding member 65 into a third oil chamber 66 formed between the second oil guiding end 624 of the oil guiding pipe 62 and the floating piston 63 (as Figure 9 shown in the figure). After that, the pneumatic oil cylinder 50 is opened and the inner tube 30 is released. At this time, the inner tube 30 will automatically rebound and rise, and during the rising process, the floating piston 63 will be pushed upwards by the oil body O in the third oil chamber 66 until the floating piston 63 abuts against the top cover 53 and then stops rising. In this way, as Figure 10 shown in the figure, the inner tube 30 will be restricted by the third oil chamber 66 to complete the reduction of the maximum rising stroke.

[0139] After the reduction of the maximum rising stroke is completed, if the rider uses the pneumatic oil cylinder 50 to lower the height of the inner tube 30 to the lowest after the ride, as long as the pneumatic oil cylinder 50 is opened during the next ride, the maximum rising stroke of the inner tube 30 will be restricted by the third oil chamber 66 and can only rise to the height as Figure 10 shown in the figure. For the same rider, there is no need to readjust the height of the seat cushion, so that the operation time can be effectively saved and the use convenience can be increased.

[0140] On the contrary, if the original maximum rising stroke is to be restored, first the pneumatic oil cylinder 50 is opened and the inner tube 30 is pressed down so that it exceeds the adjustable stroke and then the pneumatic oil cylinder 50 is closed to temporarily position the inner tube 30. Then the knob 61 is screwed outwards (as Figure 4 shown in the figure), so that the oil body O in the second oil chamber 34 flows back to the first oil chamber 33. Then the oil body O in the third oil chamber 66 will flow back from the second oil guiding hole 652 of the second oil guiding member 65 into the oil guiding channel 626 of the oil guiding pipe 62, and then along the oil guiding channel 626 of the oil guiding pipe 62, enter the second oil chamber 34 through the first oil guiding hole 642 of the first oil guiding member 64. After that, the pneumatic oil cylinder 50 is opened and the inner tube 30 is released. At this time, the inner tube 30 will automatically rebound and rise until it abuts against the floating piston 63 (as Figure 6 shown in the figure), so that the original maximum rising stroke is restored.

[0141] Please continue to refer to Figure 11 In the structure, the lifting seat tube 12 provided in the second embodiment of the present invention is substantially the same as the above-mentioned first embodiment, and the main difference is that the inner tube 70 omits the first oil chamber 33 and the second oil chamber 34, and the stroke adjustment assembly 80 controls the oil volume with an adjustment screw 84.

[0142] In this embodiment, asFigure 12 As shown, the inner tube 70 has an adjustment hole 72 axially penetrating through the top end 71. The stroke adjustment assembly 80 has an adjustment screw 84 passing through the adjustment hole 72 and screwed to the first oil guiding end 812 of the oil guiding pipe 81. When reducing the maximum upward stroke of the inner tube 70, first remove the seat clamping device 40, then open the pneumatic-hydraulic cylinder 50 (as Figure 7 shown) and press down the inner tube 70 until it exceeds the adjustable stroke, then close the pneumatic-hydraulic cylinder 50 to temporarily position the inner tube 30. After that, use a tool (such as a screwdriver, not shown in the figure) through the adjustment hole 72 to screw the adjustment screw 84 downward (as Figure 13 shown), so that the adjustment screw 84 pushes the oil body O in the oil guiding channel 814 into the third oil chamber 86 through the second oil guiding hole 822 of the second oil guiding member 82 (as Figure 14 shown). Then open the pneumatic-hydraulic cylinder 50 (as Figure 5 shown) and release the inner tube 70. At this time, the inner tube 70 will automatically rebound and rise, and during the rising process, the oil body O in the third oil chamber 86 will push the floating piston 63 upward until the floating piston 63 abuts against the top cover 53 and then stops rising. In this way, as Figure 15 shown, the inner tube 70 will be restricted by the third oil chamber 86 to complete the reduction of the maximum upward stroke.

[0143] Conversely, when restoring the original maximum upward stroke, first open the pneumatic-hydraulic cylinder 50 and press down the inner tube 70 until it exceeds the adjustable stroke, then close the pneumatic-hydraulic cylinder 50 to temporarily position the inner tube 30. Then screw the adjustment screw 84 upward to allow the oil body O in the third oil chamber 86 to flow back from the second oil guiding hole 822 of the second oil guiding member 82 into the oil guiding channel 814 of the oil guiding pipe 81. After that, open the pneumatic-hydraulic cylinder 50 and release the inner tube 70. At this time, the inner tube 70 will automatically rebound and rise until it abuts against the floating piston 63, thus restoring the original maximum upward stroke.

[0144] Please continue to refer to Figure 16 , the lifting seat tube 14 provided in the third embodiment of the present invention is substantially the same in structure as the first embodiment described above. The main difference is that the stroke adjustment assembly 60 replaces the knob 63 with a piston 67 and controls the inflow and outflow of oil with a button 68.

[0145] In this embodiment, as Figure 17 shown, the top end 31 of the inner tube 30 further has a button hole 318, and the button hole 318 is radially communicated with the second oil chamber 34 and the first oil guiding hole 642. When the button 68 is under the action of a reset elastic member 69 and is in the initial position P3 as Figure 17 shown, the second oil chamber 34 and the first oil guiding hole 642 are blocked by the button 68 and are not communicated with each other. When the button 68 is in the position as Figure 18When at the pressing position P4 shown, the communication hole 682 of the button 68 allows the second oil chamber 34 and the first oil guiding hole 642 to communicate with each other. When it is necessary to reduce the maximum ascending stroke of the inner tube 30, first open the control valve 56 (as shown in Figure 7 ), press down the inner tube 30 until it exceeds the adjustable stroke, then close the control valve 56 to temporarily position the inner tube 30. Next, press the button 68 to the pressing position P4 shown in Figure 18 , and push the piston 67 inward, so that the oil body O in the first oil chamber 33 flows through the passage 316 to the second oil chamber 34. Then, the oil body O enters the oil guiding passage 626 of the oil guiding pipe 62 from the second oil chamber 34 via the first oil guiding hole 642 (as shown in Figure 18 ), so that the oil body O flows through the oil guiding passage 626 to the second oil guiding hole 652 of the second oil guiding member 65, and then flows out from the second oil guiding hole 652 of the second oil guiding member 65 into a third oil chamber 66 formed between the second oil guiding end 624 of the oil guiding pipe 62 and the floating piston 63 (as shown in Figure 9 ). Then, release the button 68, open the control valve 56, and release the inner tube 30. At this time, the inner tube 30 will automatically rebound and rise, and during the rising process, the floating piston 63 will be pushed upward by the oil body O in the third oil chamber 66 until the floating piston 63 abuts against the top cover 53 and then stops rising. In this way, as shown in Figure 20 , the reduction of the maximum ascending stroke of the inner tube 30 is completed.

[0146] On the contrary, when it is necessary to restore the original maximum ascending stroke, first open the control valve 56, press down the inner tube 30 until it exceeds the adjustable stroke, then close the control valve 56 to temporarily position the inner tube 30. Next, press the button 68 to the pressing position P4 shown in Figure 19 , so that the oil body O in the third oil chamber 66 flows back from the second oil guiding hole 652 of the second oil guiding member 65 into the oil guiding passage 626 of the oil guiding pipe 62, and then flows along the oil guiding passage 626 of the oil guiding pipe 62 from the first oil guiding hole 642 of the first oil guiding member 64 into the second oil chamber 34 through the communication hole 682, and finally flows back from the second oil chamber 34 to the first oil chamber 33 and pushes the piston 67 outward. After that, release the button 68, open the control valve 56, and release the inner tube 30. At this time, the inner tube 30 will automatically rebound and rise until it abuts against the floating piston 63 (as shown in Figure 16 ), and thus the original maximum ascending stroke is restored.

[0147] Here, it should be added that in the above embodiment, the piston 67 can also be configured by screwing, and a hexagonal hole 672 for a tool (such as a hexagonal wrench, not shown in the figure) to engage is provided, as shown in Figure 21As shown, when the piston 67 is driven by the aforementioned tool, it can squeeze the oil body O in the first oil chamber 33 or release the space of the first oil chamber to allow the oil body O in the second oil chamber 34 to flow back. In this case, the setting of the knob 68 can be omitted. As for the method of adjusting the maximum rising stroke of the inner tube 30, it is the same as that in the above embodiment, and will not be elaborated here.

[0148] Please refer to Figure 22 again. The lifting seat tube 16 provided in the fourth embodiment of the present invention is substantially the same in structure as the first embodiment above, and the main difference lies in the different structure of the stroke adjustment assembly 90.

[0149] In this embodiment, the stroke adjustment assembly 90 has a floating piston 91 and a floating piston 92. One of the floating pistons 91 is arranged in the inner oil chamber 512 and located between the second oil guiding member 65 and the control valve 56, dividing the inner oil chamber 512 into an upper oil area 514 and a lower oil area 516. The other floating piston 92 is arranged between the inner cylinder body 51 and the outer cylinder body 52 and separates the air chamber 502 and the outer oil chamber 504. When reducing the maximum rising stroke of the inner tube 30, first open the control valve 56 (as Figure 23 shown) and press down the inner tube 30 so that it exceeds the adjustable stroke. During the process of pressing down the inner tube 30, the oil guiding pipe 62 presses down the floating piston 91 through the oil body O in the upper oil area 514, and the floating piston 91 pushes the oil body O in the lower oil area 516 to the outer oil chamber 504 through the control valve 56, causing the floating piston 92 to rise in the direction away from the bottom cover 54. Then, turn the knob 61 outwards (as Figure 24 shown), so that the oil body O in the upper oil area 514 flows back into the oil guiding channel 626, as Figure 25 and Figure 26 shown. At this time, the floating piston 91 will move towards the oil guiding pipe 62 due to the reduction of the oil volume in the upper oil area 514. At the same time, the oil body O in the outer oil chamber 504 will flow back into the lower oil area 516 through the control valve 56, causing the floating piston 92 to move downwards towards the bottom cover 54 due to the reduction of the oil volume in the outer oil chamber 504 until the floating piston 92 abuts against the bottom cover 54 and closes the control valve 56. In this way, as Figure 27 shown, the inner tube 30 will be restricted by the floating piston 92 to complete the reduction of the maximum rising stroke.

[0150] It should be added here that only one of the floating pistons 91 and 92 can also be provided according to actual needs. In the case of providing the floating piston 91, the position of the floating piston 91 can be adjusted by injecting oil into the upper oil area 514, and then the maximum descending stroke of the inner tube 30 can be adjusted. As for the case of providing the floating piston 92, the oil body O in the inner oil chamber 512 is directly pressed down through the oil guide pipe 62 to make the floating piston 92 rise, and then the oil body O in the inner oil chamber 512 is extracted, so that the floating piston 92 moves downward until it abuts against the bottom cover 54, thereby completing the adjustment of the maximum ascending stroke.

[0151] In summary, the lifting seat tubes 10, 12, 14 and 16 of the present invention use the stroke adjustment assemblies 60, 80 and 90 in cooperation with the oil body O to adjust the maximum ascending strokes of the inner tubes 30 and 70. After the adjustment is completed, it is not necessary to readjust the height of the seat cushion for the same rider, so that the operation time can be effectively saved and the use convenience can be increased.

Claims

1. A lift seat tube, characterized in that, Comprising: An outer tube; An inner tube, which is inserted through the outer tube in a vertically movable manner. The inner tube has a top end and a bottom end. The top end of the inner tube extends out of the outer tube, and the bottom end of the inner tube is located inside the outer tube; A pneumatic-hydraulic cylinder, which is arranged inside the outer tube and controls the vertical movement of the inner tube relative to the outer tube. When the pneumatic-hydraulic cylinder is opened, the inner tube can move up and down relative to the outer tube. When the pneumatic-hydraulic cylinder is closed, the inner tube cannot move up and down relative to the outer tube; and A stroke adjustment assembly, which has an oil guide pipe and a floating piston. The oil guide pipe is arranged in the inner tube. The oil guide pipe has a first oil guide end, a second oil guide end, and an oil guide channel located between the first oil guide end and the second oil guide end. The first oil guide end is fixed to the top end of the inner tube, the second oil guide end penetrates into the pneumatic-hydraulic cylinder, and the floating piston is movably arranged in the pneumatic-hydraulic cylinder. When the oil guide pipe outputs or returns an oil body from the second oil guide end, the floating piston moves corresponding to the volume of the oil body, thereby adjusting the maximum stroke amount that the inner tube can move up and down relative to the outer tube.

2. The lift seat tube according to claim 1, characterized in that, The pneumatic-hydraulic cylinder has an inner cylinder body, an outer cylinder body, and a top cover. The inner cylinder body is arranged inside the outer cylinder body and is spaced from the outer cylinder body. The top cover is arranged at the top ends of the inner cylinder body and the outer cylinder body; the second oil guide end of the oil guide pipe passes through the top cover and is located in the inner cylinder body; the floating piston is arranged between the top cover and the second oil guide end of the oil guide pipe. When the oil guide pipe outputs the oil body from the second oil guide end when the pneumatic-hydraulic cylinder is opened, the floating piston moves in a direction away from the second oil guide end of the oil guide pipe. When the oil guide pipe returns the oil body from the second oil guide end when the pneumatic-hydraulic cylinder is opened, the floating piston moves in a direction towards the second oil guide end of the oil guide pipe.

3. The lifting seat tube according to claim 1 or 2, characterized in that, The top end of the inner tube has a first oil chamber and a second oil chamber communicating with the first oil chamber. The second oil chamber is axially communicated with the first oil guide end of the oil guide pipe.

4. The lift seat tube according to claim 3, characterized in that, The top end of the inner tube also has an adjustment screw hole communicating with the first oil chamber; the stroke adjustment assembly also has a knob, which is arranged in the adjustment screw hole in a screwed manner to output the oil body in the first oil chamber to the second oil chamber or allow the oil body in the second oil chamber to flow back to the first oil chamber.

5. The lift seat tube according to claim 4, wherein, The inner cylinder body has an inner oil chamber. An air chamber is formed between the top cover and the inner cylinder body and the outer cylinder body; the pneumatic-hydraulic cylinder also has a bottom cover and a control valve. The bottom cover is arranged at the bottom ends of the inner cylinder body and the outer cylinder body and forms an outer oil chamber below the air chamber between the inner cylinder body and the outer cylinder body. The control valve is arranged in the inner cylinder body. When the control valve is in an open valve position, the inner oil chamber and the outer oil chamber communicate with each other. When the control valve is in a closed valve position, the inner oil chamber and the outer oil chamber do not communicate with each other.

6. The lift seat tube according to claim 2, characterized in that, The inner tube has an adjustment hole axially penetrating the top end; the first oil guiding end of the oil guiding pipe is screwed into the adjustment hole; the stroke adjustment assembly further has an adjustment screw, which is located in the oil guiding channel and is screwed to the first oil guiding end of the oil guiding pipe to output the oil body from the oil guiding channel to the second oil guiding end or allow the oil body to flow back from the second oil guiding end to the oil guiding channel.

7. The lift seat tube according to claim 6, wherein, The inner cylinder body has an inner oil chamber, and an air chamber is formed between the top cover, the inner cylinder body and the outer cylinder body; the pneumatic oil cylinder further has a bottom cover and a control valve. The bottom cover is arranged at the bottom ends of the inner cylinder body and the outer cylinder body and forms an outer oil chamber below the air chamber between the inner cylinder body and the outer cylinder body. The control valve is arranged in the inner cylinder body. When the control valve is in an open valve position, the inner oil chamber and the outer oil chamber communicate with each other. When the control valve is in a closed valve position, the inner oil chamber and the outer oil chamber do not communicate with each other.

8. The lift seat tube according to claim 1, wherein, The pneumatic oil cylinder has an inner cylinder body, an outer cylinder body, a top cover, a bottom cover and a control valve. The inner cylinder body has an inner oil chamber, and the inner cylinder body is arranged in the outer cylinder body and is spaced from the outer cylinder body. The top cover is arranged at the top ends of the inner cylinder body and the outer cylinder body and forms an air chamber between the inner cylinder body and the outer cylinder body. The bottom cover is arranged at the bottom ends of the inner cylinder body and the outer cylinder body and forms an outer oil chamber below the air chamber between the inner cylinder body and the outer cylinder body. The control valve is arranged in the inner cylinder body. When the control valve is in an open valve position, the inner oil chamber and the outer oil chamber communicate with each other. When the control valve is in a closed valve position, the inner oil chamber and the outer oil chamber do not communicate with each other; the second oil guiding end of the oil guiding pipe passes through the top cover and is located in the inner cylinder body; the floating piston is arranged in the inner oil chamber and is located between the second oil guiding end of the oil guiding pipe and the control valve to divide the inner oil chamber into an upper oil area and a lower oil area. When the oil guiding pipe outputs the oil body from the second oil guiding end when the control valve is in the open valve position, the floating piston moves in a direction away from the second oil guiding end of the oil guiding pipe. When the oil guiding pipe returns the oil body from the second oil guiding end when the control valve is in the open valve position, the floating piston moves in a direction towards the second oil guiding end of the oil guiding pipe.

9. The lift seat tube according to claim 1, characterized in that, The pneumatic-hydraulic cylinder has an inner cylinder body, an outer cylinder body, a top cover, a bottom cover and a control valve. The inner cylinder body has an inner oil chamber, and the inner cylinder body is arranged inside the outer cylinder body and is spaced from the outer cylinder body. The top cover is arranged at the top ends of the inner cylinder body and the outer cylinder body and forms an air chamber between the inner cylinder body and the outer cylinder body. The bottom cover is arranged at the bottom ends of the inner cylinder body and the outer cylinder body and forms an outer oil chamber below the air chamber between the inner cylinder body and the outer cylinder body. The control valve is arranged in the inner cylinder body. When the control valve is in an open valve position, the inner oil chamber and the outer oil chamber are communicated with each other. When the control valve is in a closed valve position, the inner oil chamber and the outer oil chamber are not communicated with each other. The second oil guiding end of the oil guiding pipe passes through the top cover and is located in the inner cylinder body. The floating piston is arranged between the inner cylinder body and the outer cylinder body and separates the air chamber and the outer oil chamber. When the oil guiding pipe outputs the oil body from the second oil guiding end when the control valve is in the open valve position, the floating piston moves in a direction away from the bottom cover. When the oil guiding pipe returns the oil body from the second oil guiding end when the control valve is in the open valve position, the floating piston moves in a direction towards the bottom cover.

10. The lift seat tube according to claim 1, characterized in that, The pneumatic-hydraulic cylinder has an inner cylinder body, an outer cylinder body, a top cover, a bottom cover and a control valve. The inner cylinder body has an inner oil chamber, and the inner cylinder body is arranged inside the outer cylinder body and is spaced from the outer cylinder body. The top cover is arranged at the top ends of the inner cylinder body and the outer cylinder body and forms an air chamber between the inner cylinder body and the outer cylinder body. The bottom cover is arranged at the bottom ends of the inner cylinder body and the outer cylinder body and forms an outer oil chamber below the air chamber between the inner cylinder body and the outer cylinder body. The control valve is arranged in the inner cylinder body. When the control valve is in an open valve position, the inner oil chamber and the outer oil chamber are communicated with each other. When the control valve is in a closed valve position, the inner oil chamber and the outer oil chamber are not communicated with each other. The second oil guiding end of the oil guiding pipe passes through the top cover and is located in the inner cylinder body. The stroke adjustment assembly has two such floating pistons. One of the floating pistons is arranged in the inner oil chamber and is located between the second oil guiding end of the oil guiding pipe and the control valve, and divides the inner oil chamber into an upper oil area and a lower oil area. The other floating piston is arranged between the inner cylinder body and the outer cylinder body and separates the air chamber and the outer oil chamber. When the oil guiding pipe returns the oil body from the second oil guiding end when the control valve is in the open valve position, the floating piston in the inner oil chamber moves in a direction towards the oil guiding pipe, and the floating piston between the inner cylinder body and the outer cylinder body moves in a direction towards the bottom cover.

11. The lift seat tube according to claim 1 or 2, characterized in that, The top end of the inner tube has a first oil chamber, a second oil chamber communicating with the first oil chamber, and a button hole communicating with the second oil chamber and the first oil guiding end; the stroke adjustment assembly further has a piston, a button and a return elastic member. The piston is movably disposed in the first oil chamber for outputting the oil in the first oil chamber to the second oil chamber or allowing the oil in the second oil chamber to flow back to the first oil chamber. The button is movably disposed in the button hole and has a communication hole. When the button is in an initial position, the second oil chamber and the first oil guiding end of the oil guiding pipe are blocked by the button and are not communicated with each other. When the button is in a pressed position, the second oil chamber and the first oil guiding end of the oil guiding pipe are communicated with each other through the communication hole. The return elastic member acts on the button and holds the button in the initial position.

12. The lift seat tube according to claim 11, characterized in that, The inner cylinder body has an inner oil chamber, and an air chamber is formed between the top cover and the inner cylinder body and the outer cylinder body; the air-oil cylinder further has a bottom cover and a control valve. The bottom cover is disposed at the bottom ends of the inner cylinder body and the outer cylinder body and forms an outer oil chamber below the air chamber between the inner cylinder body and the outer cylinder body. The control valve is disposed in the inner cylinder body. When the control valve is in an open valve position, the inner oil chamber and the outer oil chamber are communicated with each other. When the control valve is in a closed valve position, the inner oil chamber and the outer oil chamber are not communicated with each other.

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