TWM650426U - Seat stroke adjustment device - Google Patents

Abstract

The invention relates to a seat stroke adjustment device for a bicycle which includes an outer tube connected with a bicycle frame, an inner tube provided in the outer tube, a telescopic rod accommodated in the inner tube, and an operation member provided on the inner tube. An abutting portion is provided at one end of the telescopic rod and abuts against the operation member. The inner tube can be driven by the telescopic rod to move relative to the outer tube within a displacement stroke to adjust the height of the bicycle seat. When the operating member is operated to disconnect from the abutting portion, the inner tube can move relative to the telescopic rod along a longitudinal direction, so that the maximum displacement stroke of the bicycle seat can be adjusted.

Description

Seat cushion travel adjustment device

The present invention relates to a stroke adjustment device, in particular to a device suitable for adjusting the stroke of a bicycle seat cushion.

In order to meet the needs of different rider heights, the height of the bicycle seat cushion needs to be designed to be adjustable. A conventional height adjustment device for a bicycle seat generally includes a seat fixed seat, an outer tube connected to the bicycle frame, an inner tube located within the outer tube, and a telescopic rod. The seat cushion holder is integrated with the seat cushion. The telescopic rod includes a cylinder accommodated in the inner tube and a piston rod accommodated in the cylinder and displaceable relative to the cylinder. The top of the inner tube is connected to the seat cushion fixing base, and both ends of the telescopic rod are combined with the outer tube and the inner tube respectively. When adjusting the height of the seat cushion, the piston rod is generally displaced relative to the cylinder through the operation of a handle or a wire control component, thereby making the height of the seat cushion adjustable or fixed.

When the height adjustment device is installed on a bicycle frame, the upper end of the piston rod or the top of the cylinder is combined and fixed with the inner tube, so the displacement stroke of the inner tube relative to the outer tube has only a single maximum adjustment stroke, causing the bicycle seat cushion to Height adjustment is limited to this single maximum adjustment travel. In order to allow the seat cushion height to have a variety of maximum adjustment strokes to meet the needs of different rider heights, manufacturers need to produce telescopic rods of various sizes with different adjustment strokes, which causes trouble in production. In order to improve the problem that the seat cushion height adjustment distance is limited by the telescopic stroke of the piston rod, there is a structural design that installs an adjustment component between the inner tube and the telescopic rod so that the inner tube can move relative to the cylinder of the telescopic rod. However, the conventional technique of adding an adjustment component requires first opening the seat cushion of the bicycle, then using a tool to operate the adjustment component, and then combining the seat cushion with the seat cushion holder. This adjustment process has the disadvantage of being time-consuming and cumbersome to operate.

The object of the present invention is to provide a seat cushion stroke adjustment device, which is suitable for adjusting the height of a bicycle seat cushion, and can drive the inner tube to move relative to the telescopic rod through convenient operation, so that the maximum displacement stroke of the seat cushion can be adjusted. It can meet the needs of different heights of riders, and has the effects of simple structure and labor-saving operation.

A seat cushion stroke adjustment device according to an embodiment of the present invention includes an outer tube connected to the bicycle frame, an inner tube located in the outer tube, and a telescopic rod located in the inner tube and combined with the outer tube. . The outer tube is used to be connected to a bicycle frame and includes an upper end and a lower end separated along a longitudinal direction. The inner tube is displaceable relative to the outer tube along the longitudinal direction. The inner tube includes a top portion that protrudes from the upper end of the outer tube and can be used to connect with a bicycle seat cushion. The inner tube has an inner hole, The telescopic rod includes a cylinder accommodated in the inner tube and a piston rod accommodated in the cylinder. The piston rod is displaceable along the longitudinal direction relative to the cylinder to drive the inner tube to move relative to the outer tube. Among them, the inner tube is further provided with at least one contact portion, which is combined with the telescopic rod. The top of the inner tube is provided with an operating hole. The operating hole is connected with the inner hole and is equipped with an operating member. The inner tube can be displaced or fixed along the longitudinal direction relative to the telescopic rod by the disconnection or pushing combination between the front end surface of the operating member and the contact portion.

In one embodiment, the contact portion defines an adjustable displacement distance.

In one embodiment, the end surfaces of the front end of the operating member and the abutting portion butt against each other and the cross-sectional shapes of the abutting portion are consistent with each other.

In one embodiment, the cylinder includes a first end and a second end separated longitudinally, the first end is combined with the lower end of the outer tube, and an outer end of the piston rod extends out of the second end of the cylinder. end and combined with the abutting portion.

In one embodiment, the cylinder includes first and second ends at the longitudinal separation, the first end of the cylinder is adjacent to the top of the inner tube and combined with the abutment, and an outer end of the piston rod Extends out of the second end of the cylinder and is combined with the outer tube.

In one embodiment, the contact portion includes a long rectangular recess formed along the radial direction of the cylinder, and the recess is formed with a limiting portion at its upper and lower ends along the longitudinal direction. During the displacement of the inner tube relative to the telescopic rod along the longitudinal direction, the front end of the operating member will restrict the inner tube from continuing to move when it touches the limiting portion.

In one embodiment, the contact portion is a plurality of recesses arranged along the longitudinal extension, wherein an adjustable displacement distance is defined between the recesses respectively located at the upper and lower ends.

In one embodiment, the contact portion is a long rectangular recess formed along the radial direction of the cylinder, and a limiting portion is respectively formed at the upper and lower ends along the longitudinal direction, and is formed at the upper and lower ends along the longitudinal direction. The upper and lower limiting parts also include a plurality of recessed parts extending along the longitudinal direction and a pushing part located between the two recessed parts. The front end surface of the operating member forms a protruding part that matches the recessed parts.

In one embodiment, the operating hole of the inner tube has an internal thread, and at least a part of the operating member is screwed in the operating hole, so that when the operating member is rotated, the operating member can be converted from rotational motion to transverse motion. linear movement.

In one embodiment, the other end of the operating member is provided with a knob for operating the operating member to rotate, and the knob is exposed outside the top of the inner tube.

In one embodiment, the top is provided with a joint portion inside, the joint portion is provided with a through hole extending along the longitudinal direction and connected with the inner hole, and the abutment portion passes through the through hole of the joint portion and has an extending hole. The head end of the piercing.

In one embodiment, the through hole of the connecting portion forms a resisting surface on an inner wall of a side away from the abutting portion.

In one embodiment, the front end of the operating member is provided with a cavity. The cavity contains a spring and a ball. The cavity is provided on the end surface of the front end of the operating member. The spring has the function of pushing the ball toward the abutment portion. Due to the elastic force of pushing, the sphere can be pressed by the pushing part and displaced in a direction away from the abutting part, or can be pushed by the elastic force of the spring and move toward the abutting part and be embedded in the recessed part.

Other objects, advantages and features of the present invention can be understood from the following detailed description of the preferred embodiments and with reference to the accompanying drawings.

The specific embodiments are only examples but not limiting, and the preferred structure of the present invention will be described as follows with reference to the accompanying drawings: Figures 1 to 4A and 4B show the seat cushion of the first embodiment of the present invention. The stroke adjustment device 10 includes an outer tube 11 , an inner tube (seat tube) 12 located in the outer tube 11 , and a telescopic rod 13 located in the inner tube 12 . The telescopic rod 13 includes a cylinder 14 accommodated in the inner tube 12 and a piston rod 15 accommodated in the cylinder 14 . The outer tube 11 is used to connect with a bicycle frame (not shown). The upper end 16 of the outer tube 11 is provided with a set of covers 17 around it. The lower end 18 of the outer tube 11 is provided with a positioning seat 19 inside. The positioning seat 19 is provided with a positioning seat 19. Hole 20.

The inner tube 12 includes a top 21 that extends out of the upper end 16 of the outer tube 11 and can be combined with a seat cushion holder (not shown), which is combined with a bicycle seat cushion (not shown). below. The inner tube 12 can move relative to the outer tube 11 along a longitudinal direction, so that the seat cushion and the inner tube 12 move together. In this embodiment, the top 21 of the inner tube 12 is integrated with the inner tube 12 . In a feasible embodiment, the top 21 of the inner tube 12 is composed of a component that is detachably combined with the inner tube 12 . The inner tube 12 has an inner hole 22 inside, and a joint portion 23 is provided inside the top 21 of the inner tube 12 . The joint portion 23 is provided with a through hole 24 extending along the longitudinal direction and communicating with the inner hole 22 . An operating hole 25 is provided on the top 21 of the inner tube 12 . In this embodiment, the extending direction of the operating hole 25 is substantially perpendicular to the longitudinal direction and has an internal thread. Furthermore, a plurality of recesses 26 are provided around the bottom of the inner tube 12 , and each recess 26 accommodates a cylinder 27 so that the inner tube 12 does not rotate relative to the outer tube 11 .

The cylinder 14 is received within the inner tube 12 and includes longitudinally spaced first and second ends 28 , 29 , the first end 28 being adjacent the lower end 18 of the outer tube 11 . The cylinder 14 can be a pneumatic or hydraulic cylinder, and a channel (not shown) that can provide gas or liquid flow is provided inside. The first end 28 of the cylinder 14 is provided with a stud 30 and a control button 31 . The stud 30 is engaged in the positioning hole 20 of the outer tube 11, so that the first end 28 of the cylinder 14 is combined with the outer tube 11 (see Figure 3). One end of the control button 31 passes through the stud 30 and extends out of the positioning seat 19 .

The outer section 32 of the piston rod 15 extends out of the second end 29 of the cylinder 14 and is provided with a contact portion 33 . In this embodiment, the contact portion 33 is integrally formed with the outer end 32 of the piston rod 15 and is provided with a long rectangular notch 331 formed along the radial direction of the piston rod 15. The notch 331 is formed along the radial direction of the piston rod 15. The upper and lower ends of the longitudinal direction are respectively formed with a limiting portion 34 . The contact portion 33 passes through the through hole 24 of the coupling portion 23 and has a head end 35 extending out of the through hole 24. A stopper 36 with an outer diameter larger than the diameter of the through hole 24 is provided on the head end 35 to prevent the contact portion 33 from escaping from the through hole 24. . In this embodiment, the stopper 36 can be a screw element or a buckle or other commercially available parts that can be fixed to the head end 35 . In addition, the inner wall of the through hole 24 of the coupling portion 23 away from the contact portion 33 forms a contact surface 37 for additional support of the piston rod 15 .

The new seat cushion stroke adjustment device 10 also includes an operating member 38 that can abut against the abutment portion 33 so that the inner tube 12 and the piston rod 15 are combined and can move together relative to the outer tube 11. The operating member At least a part of the operating member 38 is screwed into the operating hole 25, so that when the operating member 38 is rotated, the operating member 38 can convert the rotational motion into a transverse linear movement. Moreover, the front end 381 of the operating member 38 locked into the operating hole 25 can abut against the abutting portion 33, and the end surface of the front end 381 and the cross-sectional shape of the notch 331 of the abutting portion 33 match each other to improve their mutual contact. Urgent effect. In this embodiment, the cylinder 14 is combined with the outer tube 11. Therefore, when the user operates the operating member 38 to disconnect the front end 381 from the contact portion 33, the user can use the other hand to pull the operating member 38 away from the contact portion 33. The inner tube 12 is adjusted up and down to be displaced relative to the piston rod 15 along the longitudinal direction. In this embodiment, the other end of the operating member 38 is provided with a knob 39 located outside the inner tube 12 so that the user can operate the operating member to rotate.

In operation of the seat cushion stroke adjustment device 10 of the present invention, when the operating member 38 and the contact portion 33 are in a state of contact with each other, the piston rod 15 can be displaced relative to the cylinder 14 along the longitudinal direction, so that the inner tube 12 can be The piston rod 15 is driven to move relative to the outer tube 11 to adjust the height of the seat cushion. Figure 3 shows that the piston rod 15 retracts inward to a position close to a low point, while Figure 4A shows that the piston rod 15 protrudes outward to a high point, so that the top 21 of the inner tube 12 has a maximum relative to the outer tube. Extension displacement stroke (S1). Since the technical content of the displacement of the piston rod 15 relative to the cylinder 14 is not a technical feature of the present invention, the internal structure of the cylinder 14 will not be described in detail here. In addition, the control button 31 is operably connected to a wire control assembly 40. The wire control assembly 40 is a conventional technology and includes a rotating handle (not shown) installed on the bicycle handlebar and operably connected to the rotating handle. The handle has a steel cable 41 and a swing arm 42, and the swing arm 42 is against the control button 31. When the rotating handle is operated to pull the steel cable 41, the swing arm 42 will swing to push the control button 31 to move, so that the gas channel or liquid channel inside the cylinder 14 is opened, so the piston rod 15 can extend or retract relative to the cylinder 14 .

The main technical feature of the present invention is that by moving the operating member 38 , the front end surface 381 can be disconnected and combined with the notch 331 of the contact portion 33 , so that there is a gap between the inner tube 12 and the telescopic rod 13 . In an unfastened state, the inner tube 12 can be freely raised or pressed down by the user to move longitudinally relative to the telescopic rod 13, so that the maximum displacement stroke of the seat cushion can be adjusted to meet the different needs of the rider's height, and It has the advantages of simple structure and convenient operation. Specifically, as shown in FIGS. 3 and 4A , the operating member 38 is installed on the top 21 of the inner tube 12 and its front end 381 is in a butting and coupled state with the abutting portion 33 . On the other hand, as shown in FIGS. 3 and 4B , when the operating member 38 is rotated to move laterally, the operating member 38 will be in a relatively disconnected state from the contact portion 33 . When the operating member 38 and the contact portion 33 are not in contact, the inner tube 12 can be freely raised or pressed down by the user to linearly move relative to the piston rod 15 along the longitudinal direction at the displacement distance D shown in Figure 4A. The displacement distance D is defined by the upper and lower ends of the notch 331 of the contact portion 33 . As shown in FIG. 4A , the stopper 36 abuts against the coupling portion 23 to form an upper positioning point.

4B shows that the inner tube 12 moves downward relative to the piston rod 15 to a position. In this position, when the operating member 38 is rotated to abut against the abutment portion 33 (not shown), the inner tube 12 It can move relative to the outer tube 11 within the displacement stroke S2. In a specific embodiment, the displacement distance D is 30 mm, the displacement stroke S1 is 210 mm, and the displacement stroke S2 is 180 mm. Therefore, in order to adjust the height of the seat cushion, the user only needs to operate the knob 39 of the operating member 38 located outside the inner tube 12 and use the other hand to raise or lower the inner tube 12 or the bicycle connected to the inner tube 12 seat cushion, the maximum displacement stroke of the inner tube 12 relative to the outer tube 11 can be adjusted between the displacement strokes S1 and S2 (for example, the maximum displacement stroke of the inner tube 12 is set to 180 mm, 190 mm, 200 mm, 210 mm, etc.) , thus allowing the seat cushion to rise and fall within the set maximum displacement stroke. Accordingly, bicycle manufacturers only need to produce telescopic rods with a small number of strokes to cover the current telescopic rods with various strokes, achieving the advantages of convenient manufacturing and simplified structure.

The seat cushion stroke adjustment device 10 according to the first embodiment of the present invention has the following advantages:

1. Using the operating member 38 (knob 39) located outside the inner tube 12 to adjust the seat cushion stroke is very convenient in implementation, and compared with the conventional method of opening the bicycle seat cushion and then using tools to operate it. Technology has the effect of saving time in operation.

2. The range of the contact portion 33 can be allowed to be longer, which is beneficial to increasing the displacement distance D.

3. In addition to being able to displace relative to the cylinder 14 along the longitudinal direction to move the inner tube 12 relative to the outer tube 11, the piston rod 15 can also cooperate with the operating member 38 to move the inner tube 12 along the longitudinal direction. The piston rod 15 moves relative to the longitudinal direction, so the piston rod 15 has diversified functions.

Figure 5 shows the seat cushion stroke adjustment device 10 of the second embodiment of the present invention. In this embodiment, the telescopic rod 13 shown in Figure 3 is installed in the inner tube 12 in reverse, so that the first end of the cylinder 14 28 is adjacent the top 21 of the inner tube 12 and the outer section 32 of the piston rod 15 is combined with the outer tube 11 . In this embodiment, the outer section 32 of the piston rod 15 is provided with a stud 30 and a control button 31 , and the stud 30 is integrated into the positioning hole 20 of the outer tube 11 . One end (bottom end 43 ) of the contact portion 33 is coupled to the first end 28 of the cylinder 14 and the other end (head end 35 ) of the contact portion 33 passes through the through hole 24 of the coupling portion 23 . The front end 381 of the operating member 38 is located in the top 21 of the inner tube 12 and abuts with the contact portion 33 . When the knob 39 of the operating member 38 is turned to move the operating member 38 laterally, the front end 381 of the operating member 38 is immediately disconnected from the abutting portion 33. In this way, the user can use the other hand to move the operating member 38. The inner tube 12 is adjusted up and down to linearly displace relative to the cylinder 14 along the longitudinal direction. The displacement distance of the inner tube 12 is defined by the upper and lower ends of the distribution range of the contact portion 33 . The knob 39 of the operating member 38 is exposed outside the inner tube 12 to facilitate the user's operation. Figure 6A shows that the cylinder 14 rises to a high point position, so that the top 21 of the inner tube 12 has a maximum extension displacement stroke (S1) relative to the outer tube 11. FIG. 6B shows that the inner tube 12 moves downward relative to the cylinder 14 to a position such that the inner tube 12 can move relative to the outer tube 11 within a displacement stroke S2. Therefore, when adjusting the height of the seat cushion, the user only needs to operate the operating member 38 (knob 39) located outside the inner tube 12 to move the inner tube 12 relative to the outer tube 11 by the maximum displacement strokes S1 and S2. adjust between.

Figures 7 and 8 show the seat cushion stroke adjustment device 10 according to the third embodiment of the present invention. In this embodiment, the contact portion 33 includes a plurality of recesses 44 arranged along the longitudinal extension, wherein they are located at the upper and lower ends respectively. The displacement distance D is defined between the recesses 44 . The end surfaces of the front end 381 of the operating member 38 and the contact portion 33 butt against each other match the cross-sectional shape of the cavity 44 .

Figures 9, 10, 11A to 11C show the seat cushion stroke adjustment device 10 according to the fourth embodiment of the present invention. In this embodiment, the contact portion 33 includes a long incised groove formed along the radial direction of the cylinder. The rectangular recess 331 has a limiting portion 34 formed at its upper and lower ends along the longitudinal direction, and includes a plurality of recessed portions 45 extending along the longitudinal direction and between the upper and lower limiting portions 34. The push portion 46 between the two recesses 45 is provided with a cavity 47 at the front end 381 of the operating member 38. The cavity 47 accommodates a spring 48 and a ball 49. The cavity 47 is located at the front end 381 of the operating member 38. On the end surface, the spring 48 has an elastic force that constantly pushes the ball 49 toward the contact portion 33. The ball 49 can be pressed by the push portion 46 and displace in a direction away from the contact portion 33 (see Figure 11B). Or it can be pushed by the elastic force of the spring 48 to be displaced toward the contact portion 33 and embedded in the recessed portion 45 (see FIG. 11C ). It is worth mentioning that the user changes from the state of the operating member 38 and the contact portion 33 shown in FIG. 11A to the disconnected state of FIG. 11B without turning the operating member 38; however, The user can also slightly rotate the operating member 38 to cause a slight displacement, thereby raising or pressing down the inner tube 12 to make a longitudinal displacement relative to the telescopic rod 13 in a relatively labor-saving manner.

In the foregoing description, the present invention is only described with respect to specific embodiments, and various changes or modifications may still be made according to the features of the present invention. Therefore, obvious substitutions and modifications that can be made by those skilled in the art will be included in the scope of the patent claimed by the present invention.

10: Seat cushion stroke adjustment device

11:Outer tube

12:Inner tube

13:Telescopic rod

14:Cylinder block

15:piston rod

16: Upper end

17: cover

18:lower end

19: Positioning seat

20: Positioning hole

21:Top

22:Inner hole

23:joint part

24:Perforation

25:Operation hole

26: concave part

27: Cylinder

28:First end

29:Second end

30: stud

31:Control button

32:Outer section

33:Butt part

331: Notch

34: Limiting part

35: Head end

36:Block

37:Resistance surface

38: Operating parts

381:Front end

39: Knob

40: Wire control components

41: Steel rope

42: Swing arm

43: Bottom

44:dent

45: Depression

46: Pushing part

47:Cavity

48:Spring

49:Sphere

D: Displacement distance

S1.S2: Displacement stroke

Figure 1 is a perspective view of a seat cushion stroke adjustment device according to the first embodiment of the present invention.

Figure 2 is an exploded view of the seat cushion stroke adjustment device of Figure 1.

Figure 3 is a cross-sectional view and a partial enlarged view of the seat cushion stroke adjustment device of Figure 1.

FIG. 4A shows a schematic diagram of the inner tube in FIG. 3 moving upward to a maximum displacement stroke.

FIG. 4B shows a schematic diagram of operating the operating member of FIG. 4A to move the inner tube relative to the piston rod.

Figure 5 is a cross-sectional view of the seat cushion stroke adjustment device according to the second embodiment of the present invention.

Figure 6A is a schematic diagram of the inner tube in Figure 5 moving upward to a maximum displacement stroke.

FIG. 6B shows a schematic diagram of operating the operating member of FIG. 6A to move the inner tube relative to the piston rod.

Figure 7 is an exploded perspective view of the seat cushion stroke adjustment device according to the third embodiment of the present invention.

Figure 8 is a cross-sectional view and an enlarged view of the seat cushion stroke adjustment device of Figure 7;

Figure 9 is an exploded perspective view of the seat cushion stroke adjustment device according to the fourth embodiment of the present invention.

Figure 10 is a partially enlarged cross-sectional view of the seat cushion stroke adjustment device of Figure 9;

Figures 11A to 11C show the relative decomposition of the protruding portion of the operating member when the inner tube of Figure 10 is adjusted up and down.

10: Seat cushion stroke adjustment device

11:Outer tube

12:Inner tube

14:Cylinder block

15:piston rod

17: cover

19: Positioning seat

20: Positioning hole

21:Top

22:Inner hole

23:joint part

24:Perforation

25: Operation hole

28:First end

30: stud

31:Control button

33:Butt part

331: Notch

34: Limiting part

35: Head end

36:Block

37:Resistance surface

38: Operating parts

381:Front end

39: Knob

40: Wire control components

41: Steel rope

42: Swing arm

Claims (11)

A seat cushion stroke adjustment device, including: An outer tube for connecting to a bicycle frame and including an upper end and a lower end separated along a longitudinal direction; An inner tube, which is disposed in the outer tube and can be displaced along the longitudinal direction relative to the outer tube. The inner tube includes a top that extends from the upper end of the outer tube and can be used to connect with a bicycle seat cushion. The interior of the inner tube has an inner hole; A telescopic rod, which is installed in the inner tube and combined with the outer tube. The telescopic rod includes a cylinder accommodated in the inner tube and a piston rod accommodated in the cylinder. The piston rod can be moved along the The longitudinal displacement relative to the cylinder drives the inner tube to move relative to the outer tube, It is characterized in that the inner tube is further provided with at least one contact portion, which is combined with the telescopic rod, and the top of the inner tube is provided with an operation hole, which is connected with the inner hole and is equipped with an operation hole. The inner tube can be displaced or fixed along the longitudinal direction relative to the telescopic rod by disconnecting or pushing against the front end of the operating member and the abutting portion. The seat cushion stroke adjustment device according to claim 1, wherein the contact portion defines a displacement distance. The seat cushion stroke adjustment device according to claim 1, wherein the end surfaces of the front end of the operating member and the abutting portion butt against each other and the cross-sectional shapes of the abutting portion are consistent with each other. The seat cushion stroke adjustment device according to claim 1, wherein the cylinder includes a first end and a second end separated longitudinally, the first end is combined with the lower end of the outer tube, and an outer end of the piston rod Extend out the second end of the cylinder and combine with the abutment part. The seat cushion stroke adjustment device according to claim 1, wherein the cylinder includes a first end and a second end at the longitudinal separation, the first end of the cylinder is adjacent to the top of the inner tube and combined with the abutment portion , an outer end of the piston rod extends out of the second end of the cylinder and is combined with the outer tube. The seat cushion stroke adjustment device according to any one of claims 1 to 5, wherein the contact portion includes a long rectangular recess formed along the radial direction of the cylinder, and the recess is formed along the radial direction of the cylinder. A limiting portion is formed respectively at the upper and lower ends of the longitudinal direction. The seat cushion stroke adjustment device according to any one of claims 1 to 5, wherein the contact portion includes a plurality of recesses arranged along the longitudinal extension, wherein the recesses at the upper and lower ends define a displacement distance . The seat cushion stroke adjustment device according to any one of claims 1 to 5, wherein the contact portion includes a plurality of recessed portions arranged along the longitudinal extension and a pushing portion located between the two recessed portions. The seat cushion stroke adjustment device according to claim 8, wherein the front end of the operating member is provided with a cavity, the cavity contains a spring and a sphere, the cavity is provided on the end surface of the front end of the operating member, and the spring has The elastic force that pushes the ball toward the contact portion allows the ball to be pressed by the push portion and move away from the contact portion, or it can be pushed toward the contact portion by the elastic force of the spring. embedded in the recess. The seat cushion stroke adjustment device according to any one of claims 1 to 5, wherein the operating hole of the inner tube has an internal thread, and at least a part of the operating member is screwed in the operating hole. The seat cushion stroke adjustment device according to any one of claims 1 to 5, wherein the top is provided with a joint portion inside, and the joint portion is provided with a through hole extending along the longitudinal direction and communicating with the inner hole, and the resistor is The connecting portion passes through the through hole of the coupling portion and has a head end extending out of the through hole.

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