TW201708016A - Bicycle seat tube lifting structure to ensure the track of lifting stroke of the lifting unit to be accurate and hard to shake - Google Patents

Abstract

The present invention relates to a lifting structure of a bicycle seat tube, wherein the seat tube comprises an outer tube and an inner tube. The seat tube is mainly installed with a lifting unit and a wire control unit. One end of the outer tube is connected to the wire control unit, and the inner tube is placed in the outer tube for lifting. The inner tube is provided for the installation of the lifting unit to enclose the main cylinder body of the lifting unit, and the telescopic rod of the lifting unit is placed inside the main cylinder body for its extension or contraction. The terminal of the telescopic rod is connected to the outer tube in order for the wire control unit to start pulling the wire for driving a linkage group to press the driving member to start the main cylinder body and the inner tube for synchronous lifting. Because the main cylinder body is connected with the inner tube, the track of lifting stroke of the lifting unit can be ensured to be accurate and hard to shake.

Description

Bicycle seat tube lifting structure

The invention relates to a technical field related to traffic equipment, in particular to a seat tube supported by a bottom of a seat cushion of a bicycle, and the structure of the lifting adjustment is more compact and effective.

According to the bicycle frame, a tube is arranged, and a pad is connected to the top of the seat tube for riding. In order to accommodate the knights of different heights, the seat tube can be adjusted up and down, and the seat tube lifting structure is convenient for the seat tube lifting adjustment. A variety of types, such as the certificate number 484541 "high-low adjustable seat tube for bicycles" new patent case <hereinafter: refer to the previous case>, which is mainly an outer tube, an inner tube, a base, a control component, The inner side of the outer tube wall includes a plurality of annular fixing grooves, and the inner tube is inserted into the outer tube and moves relative to the outer tube; and the base is fixed to one side opening of the inner tube; The control assembly includes a control valve, a control rod, a class surface piston, at least one ball and a spring, the control rod is inserted into the inner tube; the control valve is pivotally connected to the base And one end is connected to the control rod; the piston is fixed to the other end of the control rod relative to the control valve, and the at least one ball system portion protrudes from the outer wall of the inner tube and is selectively engaged with the class of the piston One of the surface and the inner wall of the outer tube Shaped fixing groove.

The reference case is pressed by the external force by the control valve to pull up the control rod and its piston to raise the position, so that the class surface of the piston is away from the ball, so that the ball is from the outer tube in a ring shape. The fixing groove is loosened, and the inner tube is moved together with the two balls relative to the outer tube to move downward to the other annular fixing groove of the outer tube, so that the inner tube is further retracted into the outer tube to lower the seat. Pad height.

Although the reference to the previous case has the advantage of one-hand operation, the reference to the front case uses the control rod and the ball to fix the inner tube at different height positions relative to the outer tube, so the balls, pistons, springs, washers, levers, Many components such as the oil chamber are installed in the inner tube, so the assembly is time-consuming and costly. In addition, the lifting and lowering lever is connected to the inner tube by the piston and other components, resulting in the distance between the control rod and the inner side wall of the inner tube. The large gap makes the probability of the control rod shaking in the inner tube become larger, so that the left and right shaking affects the accuracy of the lifting and lowering of the control unit.

The inventors of the present invention have intensively studied and developed in view of the foregoing problems. Therefore, the main object of the present invention is to provide a bicycle seat tube lifting structure, which is mainly an inner tube capable of lifting and lowering a seat tube, and a diameter is connected to a lifting unit for controlling lifting. Therefore, the structure is simplified, the cost is reduced, the maintenance is easy, and the accuracy of the lifting and lowering trajectory of the lifting unit is improved.

In order to achieve the foregoing object, the technical means for the present invention is to provide a bicycle seat tube lifting structure, the seat tube includes an outer tube and an inner tube, and a lifting unit and a line control unit are mounted on the seat tube; The outer tube has two ends, and the first end and the second end are respectively arranged at the bottom and the top end, and the first end is connected to the line control unit; the inner tube is accommodated in the outer tube and can be relatively lifted and lowered, the inner tube The two ends are respectively included as a joint end and a joint end for connecting the lifting unit; The lifting unit comprises a main cylinder body, a telescopic rod for axially arranging the main cylinder body, the main cylinder body is adapted to extend into the inner tube, and the main cylinder body is at the junction with the telescopic rod Wherein the connecting end is provided with a joint portion for detachably fixing the joint portion to the joint portion for connecting the lifting unit to the seat tube, the end of the telescopic rod being a fixed end and being connectable to The first end of the outer tube is provided with a driving member for driving the main cylinder to be lifted and lowered; the line control unit comprises a starting switch, a pulling wire and a linkage group, wherein the starting switch can be set For controlling the bicycle, the start switch is connected to one end of the pull wire, so as to press the start switch to illuminate the pull wire, the other end of the pull wire is coupled to the linkage group, and the other end of the linkage group is used to drive the drive The piece causes the inner tube to rise and fall along the inside of the outer tube.

In order to achieve the foregoing objective, the technical means utilized by the present invention is to provide another bicycle seat tube lifting structure, the seat tube includes an outer tube and an inner tube, and a lifting unit and a positioning member are mounted on the seat tube. a first-line control unit; wherein: the outer tube has two ends, respectively disposed at the bottom and the top end, and the first end is connected to the line control unit; the inner tube is disposed in the outer tube and is opposite The inner tube comprises two ends, which are respectively a joint end and a connecting end; the lifting unit comprises a main cylinder body, and a telescopic rod for axially sleeved outside the main cylinder block, the main cylinder body Suitable for extending into the inner tube, the end of the telescopic rod is a fixed end, and can be coupled to the first end of the outer tube, and the driving end is provided with a driving member for driving the main cylinder to lift and lower; The positioning member is an annular body, and the positioning member is an annular body, and is detachably fixedly disposed on the inner tube and the main cylinder body, and the inner tube is coupled to the main cylinder body to be raised and lowered together; The line control unit includes a start switch, a pull wire, and a linkage set, wherein the start switch can be disposed on the bicycle for control, and the start switch is connected to one end of the pull wire, thereby pressing the start switch to ignite the pull wire The other end of the cable is coupled to the linkage group, and the other end of the linkage group is used to drive the driving member to cause the inner tube to rise and fall along the inner portion of the outer tube.

Therefore, in accordance with the technical means of the present invention, a brief description of the functions that can be obtained by the present invention is as follows:

1. The present invention mainly provides a line control unit at the bottom of the seat tube. The seat tube includes an inner tube and an outer tube, and the telescopic rod of the lifting unit is coupled to the outer tube, and the main cylinder that can be lifted and lowered is not only surrounded by the inner tube. The connection is fixed to the inner tube. Therefore, when the main cylinder of the lifting unit is driven by the line control unit to lift and lower, it can be accurately lifted and lowered on the vertical axis without any gap causing left and right shaking, effectively and substantially improving the lifting precision of the lifting unit. The degree is stable and reliable.

2. The connection mode of the inner tube and the lifting unit of the present invention may be that the inner tube directly threads the main cylinder body, or the combination of the inner tube, the positioning member and the main cylinder body changes, so that the main cylinder body and the inner cylinder The combination strength of the tube is reliable, not easy to loose, low in cost, and quick in assembly.

3. If the lifting unit of the present invention is damaged, it is only necessary to remove the entire lifting unit from the inner tube and the line control unit, and then replace the new lifting unit into the inner tube, and reassemble the connection to be used, so that the maintenance is easy.

(100) ‧‧‧ seat tube

(10) ‧ ‧ external management

(11) ‧ ‧ first end

(12) ‧‧‧ second end

(13) ‧‧‧ positioning group

(131)‧‧‧ Bearings

(132)‧‧‧ Rings

(133)‧‧‧ Nuts

(15)‧‧‧ Guide slots

(20) ‧ ‧ inner management

(21)‧‧‧Connector

(22) ‧‧‧Connecting end

(221) (551) ‧ ‧ internal thread

(24) ‧ ‧ guides

(25)‧‧‧External threaded end

(30)‧‧‧ Lifting unit

(31)‧‧‧Master cylinder

(311) ‧ ‧ joints

(32)‧‧‧ Telescopic rod

(321) ‧‧‧ fixed end

(33)‧‧‧ Drives

(40)‧‧‧Line control unit

(41)‧‧‧Start switch

(42)‧‧‧Bundle

(43)‧‧‧ Pull wire

(44)‧‧‧ linkage group

(45)‧‧‧Base

(451)‧‧‧Fork

(452) ‧‧‧ Opening

(46) ‧‧‧Boom

(47) ‧‧‧ swing arm

(471)‧‧‧Contact

(48) ‧ ‧ spring

(50)(52)(55)‧‧‧ Positioning parts

(521)‧‧‧ External thread

(522)‧‧‧ lips

(552) ‧ ‧ affiliation

(60) (601) ‧ ‧ seat head

(61)‧‧‧ tightening group

The first figure is a perspective view of a preferred embodiment of the present invention.

The second drawing is an exploded view of a three-dimensional element of a preferred embodiment of the present invention.

The third drawing is a combined sectional view of a preferred embodiment of the present invention.

Figure 4 is a cross-sectional view showing the action of a preferred embodiment of the present invention.

The fifth drawing is a perspective view of a second preferred embodiment of the present invention.

Figure 6 is an exploded perspective view of a three-dimensional element of a second preferred embodiment of the present invention.

Figure 7 is a cross-sectional view showing a combination of a second preferred embodiment of the present invention.

Figure 8 is a perspective view of a third preferred embodiment of the present invention.

The ninth drawing is an exploded view of a three-dimensional member of a third preferred embodiment of the present invention.

Figure 10 is a sectional view showing a combination of a third preferred embodiment of the present invention.

The eleventh drawing is an exploded view of a three-dimensional member of a fourth preferred embodiment of the present invention.

Figure 12 is a sectional view showing the combination of a fourth preferred embodiment of the present invention.

The present invention is a bicycle seat tube lifting structure, and the present invention is described by a number of preferred embodiments. First, please refer to the first, second, third and fourth figures, which is a first preferred embodiment of the present invention. (100) comprising an outer tube (10) and an inner tube (20), wherein a lifting unit (30) and a first line control unit (40) are mounted on the seat tube (100); wherein: the outer tube (10) is installed Fixed to the bicycle frame (not shown), the outer tube (10) comprises two ends, which are a first end (11) and a second end (12) respectively, and the first end (11) is located at the bottom, wherein The wire control unit (40) is connected by a screw lock, the second end (12) is located at the top, and the second end (12) is mounted with a positioning group (13). The positioning group (13) comprises a bearing (131) and a number of rings. a member (132) and a nut (133) are mounted on the inner side wall of the second end (12) by using a bearing (131) of the positioning group (13) and a plurality of ring members (132), and then screwed with a nut (133) On the outer side of the second end (12), the relevant components such as the positioning group (13) are stopped, and the inner side wall of the outer tube (10) is recessed in the axial direction as shown in the second and third figures. (15); the inner tube (20) is for accommodating the outer tube (10) and is opposite to the outer tube (10) The inner tube (20) includes two ends, which are respectively a joint end (21) to which the seat tube head (60) is coupled, and a joint end (22) for connecting the lifting unit (30). The side corresponds to the guide groove (15) of the outer tube (10), and the plurality of guide bars (24) are axially embedded, so that the inner tube (20) is slidably moved up and down along the guide groove (15) by the guide bar (24), and is kept. In the linear stroke lifting, the connecting end (22) can be an internal thread (221) on the inner side wall as shown in the third embodiment; the lifting unit (30) comprises a main cylinder (31), a Telescopic rod (32), The main cylinder block (31) may be a pneumatic pump or a hydraulic pump, and the outer diameter thereof is suitable for being placed in the inner tube (20), and the main cylinder block (31) is fixedly fixed to the inner tube (20). At the junction of the telescopic rod (32), a connecting portion (311) corresponding to the connecting end (22) of the inner tube (20) is provided with a joint portion (311) which is externally threaded in this embodiment for engaging the inner tube (20) The internal thread (221) is connected to the seat tube (100), the fixed end (321) is disposed at the end of the telescopic rod (32), and the fixed end (321) of the telescopic rod (32) is disposed a driving member (33) for driving the main cylinder (31) to lift and lower; the line control unit (40) includes a starting switch (41), a pulling wire (43), and a linkage group (44), wherein The start switch (41) is disposed on a bundle of rings (42), and the bundle of rings (42) is sleeved on the bicycle handlebar for pressing the start switch (41), and the starter switch (41) is connected to the cable One end of the pull wire (43) can be used to push the pull wire (43) by pressing the start switch (41), and the other end of the pull wire (43) is coupled to the linkage group (44), and the line is made by the interlocking group (44) The control unit (40) can control the driving member (33) of the lifting unit (30); wherein the linkage group (44) 2 and 3, comprising a base (45) threadedly engaged inside the first end (11) of the outer tube (10), a moving arm (46), a swing arm (47), a spring (48), and a base. (45) The bottom side extends an open fork portion (451), and the outer end of the fork portion (451) is provided with an opening (452); whereby one end of the moving arm (46) enters and is pivoted into the fork portion (451), The side of the boom (46) can be touched by the driving member (33) of the lifting unit (30), and the other end of the boom (46) is provided to abut against the outside of the swing arm (47), and the swing arm (47) has two The middle end is pivotally connected to the fork portion (451), and one end of the swing arm (47) is connected to the pull wire (43) and one end of the wire (452) is pierced from the opening hole, and the other end is The fork portion (451) is connected to one end of the spring (48), the end of the adjacent spring (48) is a contact portion (471), and the other end of the spring (48) is coupled to the end of the fork portion (451), and the wire is pulled (43). The swing arm (47) can be pulled to move the boom (46), and the boom (46) is pressed against the driving member (33) to drive the main cylinder (31) to move up and down.

Therefore, as shown in the third and fourth figures, if the rider wants to adjust the height of the lower seat tube (100), the rider presses the start switch (41) to illuminate the swing arm (43) to the swing arm of the linkage group (44). (47) moving downward with the pivot portion of the fork portion (451) as a fulcrum, causing the contact portion (471) of the swing arm (47) to be upturned, and generating a force to the upper arm against the boom (46). The moving arm (46) is moved up against the contact member (33), and the trigger member (33) is caused to drive the main cylinder (31) and the inner tube (20) to retract into the outer tube (10), thereby reducing the seat tube ( 100) The height, after adjustment, release the start switch (41), and the elastic restoring force of the spring (48) drives the swing arm (47) and the boom (46) to move down to return to the original position.

If the seat tube (100) whose height has been lowered is to be raised, the rider needs to leave the seat cushion and press the start switch (41) to urge the pull wire (43) and the interlocking group (44) to touch the touch member ( 33) The main cylinder (31) together with the inner tube (20) is raised along the inner tube (10).

In this way, the lifting unit (30) is fixed to the inner tube (20) of the seat tube (100) through the joint portion (311) of the main cylinder block (31), and the line control unit (40) is disposed on the seat tube (100). At the bottom, the main cylinder block (31) is again accommodated in the inner tube (20), so the main cylinder block (31) is synchronously raised and lowered with the inner tube (20), so that the lifting unit (30) does not shake left and right, positioning Good sex.

Please refer to the fifth, sixth, and seventh figures, which are the second embodiment of the present invention, and the main The connection type change of the positioning member (50), the lifting unit (30), and the inner tube (20), wherein the positioning member (50) is annular, and the main cylinder (31) and the inner tube of the lifting unit (30) (20) The difference in axial length is filled by the positioning member (50), and is tightly fitted to the inner side surface of the connecting end (22) of the inner tube (20) through the outer side of the positioning member (50), by the positioning member (50) To prevent the main cylinder (31) from being mounted at the highest position of the inner tube (20), the main cylinder (31) and the inner tube (20) are allowed to descend to adjust the height.

Please refer to the eighth, ninth and tenth drawings, which is a third embodiment of the present invention, which is mainly designed according to another type of positioning member (52). The positioning member (52) is annular and externally provided with external threads. (521), a lip (522) protrudes from the bottom side; the axial length of the main cylinder (31) and the inner tube (20) of the lifting unit (30) is still filled by the positioning member (52). Threaded to the inner tube (20) internal thread (221) through the external thread (521) of the positioning member (52), the lip (522) is located at the bottom side of the connecting end (22); thereby the positioning member (52) abuts the master cylinder The body (31) is mounted at the highest position of the inner tube (20), allowing the main cylinder (31) and the inner tube (20) to descend to adjust the height.

Please refer to the eleventh and twelfth drawings. In the fourth embodiment of the present invention, the positioning member (55) and the inner tube (20) and the lifting unit (30) are further connected. (55) is annular, the inner side is set to the internal thread (551), the bottom side protrudes inwardly with a ring (552); the main unit (31) of the lifting unit (30) and the inner tube (20) There is no difference in the length, and the outer side of the inner tube (20) is set as the externally threaded connecting end (25), and the positioning member (55) is screwed to the externally threaded connecting end (25), and the through-edge (552) is abutted against The bottom end surface of the inner tube (22); the positioning main member (31) is mounted on the inner tube (20) by the positioning member (55), and the main cylinder (31) and the inner tube (20) are allowed to move along the inner side of the outer tube (10). To adjust the height.

In addition, in the embodiment of the fifth, sixth, and seventh embodiments, the inner tube (20) can be separated from the seat tube head (60), and the tightening group (61) for clamping the seat cushion is disposed on the seat tube head. (60), the tightening group (61) and the seat tube head (60) are separated from the inner tube (20) of the seat tube (100).

As shown in the ninth and tenth figures, the inner tube (20) can be integrated with the seat tube head (601) at the top thereof, and the other end of the other tube head (601) is terminated with the tight group (61).

In summary, the "bicycle seat tube lifting structure" disclosed in the present invention provides a stepless height adjustment lifting structure, the inner tube is accommodated in the outer tube and can be raised and lowered, and the inner tube is installed for the lifting unit to surround The main cylinder of the lifting unit, and the telescopic rod of the lifting unit is placed in the main cylinder for telescoping, and the end of the telescopic rod is connected to the outer tube, so that the line control unit activates the pulling line to induce the interlocking group to press the driving member. The main cylinder and the inner tube are synchronously lifted and lowered. Since the main cylinder is connected to the inner tube, it can ensure that the lifting and lowering trajectory of the lifting unit is not easy to shake, so that the whole industry is practical and cost-effective, and its structure is I have never seen it in various books or publicly used, and I am in line with the requirements of the invention patent application. I would like to ask the Bureau to give it a patent and express my prayers.

(100) ‧‧‧ seat tube

(10) ‧ ‧ external management

(11) ‧ ‧ first end

(12) ‧‧‧ second end

(13) ‧‧‧ positioning group

(131)‧‧‧ Bearings

(20) ‧ ‧ inner management

(21)‧‧‧Connector

(22) ‧‧‧Connecting end

(221)‧‧‧ Internal thread

(24) ‧ ‧ guides

(30)‧‧‧ Lifting unit

(31)‧‧‧Master cylinder

(311) ‧ ‧ joints

(32)‧‧‧ Telescopic rod

(321) ‧‧‧ fixed end

(33)‧‧‧ Drives

(40)‧‧‧Line control unit

(41)‧‧‧Start switch

(42)‧‧‧Bundle

(43)‧‧‧ Pull wire

(44)‧‧‧ linkage group

(45)‧‧‧Base

(451)‧‧‧Fork

(452) ‧‧‧ Opening

(46) ‧‧‧Boom

(47) ‧‧‧ swing arm

(471)‧‧‧Contact

(48) ‧ ‧ spring

Claims (18)

A bicycle seat tube lifting structure, the seat tube comprises an outer tube and an inner tube, wherein a lifting unit and a line control unit are mounted on the seat tube; wherein: the outer tube has two ends, respectively arranged at the bottom and the top The first end is connected to the line control unit; the inner tube is accommodated in the outer tube and can be relatively lifted and lowered. The inner tube includes two ends, respectively a joint end and a connection unit a connecting end; the lifting unit comprises a main cylinder body, a telescopic rod for axially sleeved outside the main cylinder body, the main cylinder body is adapted to extend into the inner tube, and the main cylinder body is a joint portion is disposed at the junction of the telescopic rod, and the connecting end is provided with a joint portion for detachably fixing the joint portion for connecting the lifting unit to the seat tube, and the end of the telescopic rod is a fixed end. And connecting to the first end of the outer tube, the driving end is provided with a driving member for driving the main cylinder to be lifted and lowered; the line control unit comprises a starting switch, a pulling line and a linkage group, wherein the driving unit comprises a starting switch The start switch can be set on the bicycle for manipulation, the start Closing one end of the pull wire, thereby pressing the start switch to illuminate the pull wire, the other end of the pull wire is coupled to the linkage group, and the other end of the linkage group is used to drive the drive member to make the inner tube along the outer The inside of the tube rises and falls The bicycle seat tube lifting structure according to claim 1, wherein the second end of the outer tube is provided with a positioning group, the positioning group comprises a bearing, a number of ring members and a nut, and the positioning group is The bearing and the ring member are mounted on the inner side wall of the second end, and the nut is screwed to the outer side of the second end. The bicycle seat tube lifting structure according to claim 1, wherein the seat tube is The inner side wall of the outer tube is recessed with a plurality of guide grooves in the axial direction, and the outer side surface of the inner tube is correspondingly embedded with a plurality of guide bars, and the concave and convex faces are raised and lowered corresponding to the track of the guide groove. The bicycle seat tube lifting structure according to claim 1, wherein the joint end of the inner tube is connected to a tube head, and a tightening group for clamping the seat cushion is mounted on the tube head. The bicycle seat tube lifting structure according to claim 1, wherein a top end of the joint end of the inner tube is integrally connected with a tube head, and a tightening group for clamping the seat cushion is mounted on the tube head. The bicycle seat tube lifting structure according to claim 1, wherein the connecting end of the inner tube is provided with an internal thread on the inner side wall, and the joint portion of the main cylinder of the lifting unit is An external thread is provided for the externally threaded joint to be threadedly engaged with the internal thread of the connecting end. The bicycle seat tube lifting structure according to claim 1, wherein the starting switch of the line control unit is disposed on a collar for sleeved on the bicycle handlebar. The bicycle seat tube lifting structure according to claim 1, wherein the linkage group comprises a base threadedly engaged on the inner side of the first end of the outer tube, a boom, a swing arm, and a spring, the bottom side of the base Extending a fork portion of the opening, the outer end of the fork portion is provided with an opening; whereby one end of the movable arm enters and is pivoted in the fork portion, the side of the movable arm touches the driving member, and the other end of the movable arm is provided The swing arm has two ends, the middle arm is pivotally connected to the fork portion, one end is connected to one end of the pull wire from the opening, and the other end enters the fork portion to connect the spring end, adjacent to The end of the spring is a contact portion, and the other end of the spring is coupled to the end of the fork portion, and the pulling wire pulls the swing arm to move the movable arm to press the driving member to drive the main cylinder to lift and lower . A bicycle seat tube lifting structure, the seat tube comprises an outer tube and an inner tube, wherein the lifting tube unit is mounted with a lifting unit, a positioning member and a line control unit; wherein: the outer tube has two ends, respectively at the bottom and the top end The first end is connected to the line control unit; the inner tube is accommodated in the outer tube and can be relatively lifted and lowered, and the inner tube comprises two ends, which are respectively a joint end and a connection The lifting unit comprises a main cylinder body and a telescopic rod for axially arranging the main cylinder body. The main cylinder body is adapted to extend into the inner tube, and the end of the telescopic rod is set to a fixed end. And being connected to the first end of the outer tube, wherein the fixed end is provided with a driving member for driving the main cylinder to be lifted and lowered; the positioning member is an annular body, and is detachably fixedly disposed therein. And the main cylinder, the inner tube is connected to the main cylinder to be lifted and lowered; the line control unit comprises a start switch, a pull wire, and a linkage group, wherein the start switch can be disposed on the bicycle for manipulation, The start switch is connected to one end of the pull wire, thereby pressing the start switch to be cited The wire, the wire and the other end bonded to the linking group, the linking group of the other end of the drive train for driving the lifting member so that the inner tube along the interior of the outer tube. The bicycle seat tube lifting structure according to claim 9, wherein the positioning member is a hollow ring, and the main cylinder of the lifting unit and the inner tube are disposed with a space of a shaft length difference and are filled by the positioning member. The outer side of the positioning member is tightly fitted to the inner side surface of the connecting end of the inner tube to abut the inner cylinder to be mounted in the inner tube. The bicycle seat tube lifting structure according to claim 9, wherein the positioning member is annular, and an outer thread is provided on the outer side, and a lip is protruded from the bottom side, and the inner tube is connected to the connection. The inner side of the connecting end is set as an internal thread, and the main cylinder body of the lifting unit and the inner tube are set to have a space of a shaft length difference and are filled by the positioning member, whereby the external thread of the positioning member is threadedly engaged with the inner tube. The internal thread has a lip located at a bottom side of the connecting end; whereby the positioning member is positioned on the inner tube. The bicycle seat tube lifting structure according to claim 9, wherein the positioning member is annular, the inner side is an internal thread, and the bottom side is protruded inwardly with a ring, and the outer side of the inner tube is set to an outer a threaded connection end; wherein the positioning member is threadedly engaged with the externally threaded connection end, the abutment being located at the bottom end surface of the inner tube. The bicycle seat tube lifting structure according to claim 9, wherein the second end of the outer tube is mounted with a positioning group, the positioning group comprises a bearing, a number of ring members and a nut, and the positioning group The bearing and the ring member are mounted on the inner side wall of the second end, and the nut is screwed to the outer side of the second end. The bicycle seat tube lifting structure according to claim 9, wherein the inner side wall of the outer tube of the seat tube is recessed with a plurality of guide grooves in the axial direction, and the outer side surface of the inner tube is correspondingly embedded with a plurality of guide bars, It should be raised and lowered by the track of the guide groove. The bicycle seat tube lifting structure according to claim 9, wherein the joint end of the inner tube is connected to a pipe head, and a tightening group for clamping the seat cushion is mounted on the pipe head. The bicycle seat tube lifting structure according to claim 9, wherein a top end of the joint end of the inner tube is integrally connected with a tube head, and a tightening group for clamping the seat cushion is mounted on the tube head. The bicycle seat tube lifting structure according to claim 9, wherein the starting switch of the line control unit is disposed on a collar for sleeved on the bicycle handlebar. The bicycle seat tube lifting structure according to claim 9, wherein the linkage group comprises a base threadedly engaged on the inner side of the first end of the outer tube, a boom, a swing arm, and a spring, the bottom side of the base Extending a fork portion of the opening, the outer end of the fork portion is provided with an opening; whereby one end of the movable arm enters and is pivoted in the fork portion, the side of the movable arm touches the driving member, and the other end of the movable arm is provided The swing arm has two ends, the middle arm is pivotally connected to the fork portion, one end is connected to one end of the pull wire from the opening, and the other end enters the fork portion to connect the spring end, adjacent to The end of the spring is a contact portion, and the other end of the spring is coupled to the end of the fork portion, and the pulling wire pulls the swing arm to move the movable arm to press the driving member to drive the main cylinder to lift and lower .