CN210063213U

CN210063213U - Anti-slip seat pipe assembly and vehicle

Info

Publication number: CN210063213U
Application number: CN201920948590.9U
Authority: CN
Inventors: 杨磊; 张洪波
Original assignee: Shanghai Junzheng Network Technology Co Ltd
Current assignee: Shanghai Junzheng Network Technology Co Ltd
Priority date: 2019-06-21
Filing date: 2019-06-21
Publication date: 2020-02-14
Anticipated expiration: 2029-06-21

Abstract

The utility model provides an antiskid seat pipe subassembly and vehicle of falling, this antiskid seat pipe subassembly of falling includes: the top end of the middle pipe is provided with an opening; the side surface of the seat tube is provided with a plurality of limiting grooves distributed along the axial direction of the seat tube; the first end of the seat tube extends into the middle tube from the opening; the bayonet lock is arranged on the middle pipe and can be clamped in the limiting groove, so that the limiting groove and the bayonet lock form a ratchet mechanism to limit the seat pipe to move towards the first end of the seat pipe, and compared with a quick-release structure which adopts friction force to limit in the prior art, the ratchet mechanism has larger bearing capacity and better reliability and can more effectively prevent the seat pipe from sliding down. In addition, the ratchet mechanism does not need to be fastened by a knob bolt in the adjusting process, so that the adjusting process is easier.

Description

Anti-slip seat pipe assembly and vehicle

Technical Field

The utility model relates to a non-motor vehicle field, in particular to antiskid seat pipe assembly and vehicle that falls.

Background

The sharing of the single bicycle refers to that an enterprise provides bicycle sharing service in a campus, a subway station, a bus station, a residential area, a commercial area, a public service area and the like, and the sharing mode is a time-sharing rental mode. The sharing bicycle brings great convenience to people for short-distance travel in the city.

The shared bicycle needs to be used by different users, and the height of the saddle of the shared bicycle needs to be frequently adjusted because the height and the use habit of each user are different and each user needs the saddle with different height. The prior art quick release of the saddle is difficult to adapt to this requirement.

For example, the most common quick release in the existing bicycle adopts an eccentric wheel quick release handle structure, the seat tube is clamped by compressing the hoop by a cam to drive the middle tube to contract, and the seat tube and the middle tube are mutually friction to play a role in preventing slipping during riding. The quick release structure has the following disadvantages: (1) when the pressing is in place, great force is needed, the pressing is not easy to be in place due to small strength, and the pressing is not beneficial to users with weak strength; (2) after the handle is used for a period of time, the middle pipe is worn, the working shaft length of the working shaft connected with the handle needs to be adjusted again, and a bolt at the other end of the working shaft is usually worn and rusted after the handle is used for a long time, so that the shaft length of the working shaft is difficult to adjust; (3) when the bicycle is not locked firmly, the bicycle is easy to slide off during riding; (4) after the eccentric wheel is adjusted for many times, the contact surface between the eccentric wheel and the hoop becomes rough, so that the eccentric wheel is difficult to rotate.

For another example, some bicycles employ a rotary quick release handle, which tightens the middle tube by screw fastening, clamps the seat tube, and plays a role of anti-slip during riding by means of the mutual friction force between the middle tube and the seat tube. Such a quick-insertion handle has the following drawbacks: (1) the locking process takes longer time; (2) after the bicycle is locked, the position of a lock handle is not fixed, and riding can be influenced; (3) when the bicycle is not locked firmly, the bicycle is easy to slide off during riding.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an antiskid takes a seat pipe assembly and vehicle according to above-mentioned prior art not enough.

The utility model discloses the purpose is realized accomplishing by following technical scheme:

an anti-slip seat tube assembly, comprising:

the top end of the middle pipe is provided with an opening;

the side surface of the seat tube is provided with a plurality of limiting grooves distributed along the axial direction of the seat tube; the first end of the seat tube extends into the middle tube from the opening;

the clamping pin is arranged on the middle pipe and can be clamped in the limiting groove, so that the limiting groove and the clamping pin form a ratchet mechanism to limit the seat pipe to move towards the first end of the seat pipe.

The utility model discloses a further improvement lies in, be provided with rotatory spacing portion on the well pipe, rotatory spacing portion is used for the restriction the rotation range of bayonet lock.

The utility model discloses a further improvement lies in, rotatory spacing portion is including setting up the first breach on the top of well pipe.

The utility model discloses a further improvement lies in, the spacing groove closes on the lateral wall of the first end of seat pipe is provided with the direction inclined plane, the spacing groove closes on the lateral wall of the second end of seat pipe is provided with the card solid surface.

The utility model is further improved in that the clamping end of the clamping pin is provided with a slope surface matched with the guide inclined plane; the clamping end is used for abutting against the clamping surface of the limiting groove.

The utility model is further improved in that the top of the seat tube comprises a hoop; the hoop is used for fastening the seat tube and the middle tube; the bayonet lock is connected with a handle, and the handle is used for fastening or opening the hoop.

The utility model is further improved in that the bayonet lock is connected with the handle through a connecting piece; the connecting piece and the clamping pin form a limited rotation connection.

The utility model is further improved in that the connecting piece is provided with a forward limiting part and a reverse limiting part, and the clamping pin is provided with a forward abutting part and a reverse abutting part; the forward limiting part and the forward abutting part form a forward limiting mechanism, and the reverse limiting part and the reverse abutting part form a reverse limiting mechanism; the forward limiting mechanism and the reverse limiting mechanism are used for limiting the rotation range between the connecting piece and the clamping pin.

The utility model has the further improvement that the connecting piece comprises a connecting section with a D-shaped section, and the bayonet lock is provided with a connecting hole; the connecting section penetrates through the connecting hole, and the side surface of the connecting section comprises a plane area and a curved surface area; the two sides of the plane area are respectively provided with the forward limiting part and the reverse limiting part; the inner surface of the connecting hole is provided with a convex structure; the convex structure faces the plane area of the connecting section; the two side surfaces of the protruding structure are respectively the positive abutting part and the reverse abutting part.

The utility model is further improved in that the hoop comprises a gap, and an ear plate is arranged at the position of the hoop close to the gap; the handle comprises an ear plate pushing piece used for pushing the ear plate, and the handle drives the hoop to be fastened or opened through the ear plate pushing piece.

The utility model has the further improvement that the inner edge of the hoop is provided with a limit bulge; the limiting bulge is clamped in the second notch at the top end of the middle pipe.

The utility model is further improved in that the limiting bulge extends towards the inner side of the middle pipe; the side wall of the seat tube is provided with a guide groove matched with the limiting bulge; the guide groove extends in the axial direction of the seat tube.

The utility model discloses still include a vehicle, it includes foretell antiskid seat pipe assembly.

The utility model has the advantages that: the bayonet lock and each clamping groove form a ratchet mechanism, and compared with a quick-release structure which adopts friction force to limit in the prior art, the ratchet mechanism has larger bearing capacity and better reliability, and can more effectively prevent the seat tube from sliding down. In addition, the ratchet mechanism does not need to be fastened by a knob bolt in the adjusting process, so that the adjusting process is easier.

Drawings

FIG. 1 is a perspective view of a slip resistant seating tube assembly;

FIG. 2 is a cross-sectional view of the anti-skid seat tube assembly;

FIG. 3 is an enlarged view of a portion of FIG. 2;

FIG. 4 is an exploded view of the anti-skid seat tube assembly;

FIG. 5 is a top view of the handle;

FIG. 6 is a side view of the bayonet and connector.

The reference numbers are as follows:

the pipe comprises a pipe body 1, a pipe seat 2, a bayonet 3, a limiting groove 4, a first end 5, a rotary limiting part 6, a guide inclined plane 7, a second end 8, a clamping surface 9, a clamping end 10, a slope surface 11, a buffer surface 12, a handle 13, a connecting piece 14, a hoop 15, a lug plate 16, a lug plate limiting part 17, a lug plate pushing piece 18, a connecting hole 19, a positive limiting part 20, a negative limiting part 21, a positive abutting part 22, a negative abutting part 23, a connecting section 24, a curved surface area 25, a plane area 26, a protruding structure 27, a limiting protrusion 28, a second notch 29 and a guide groove 30.

Detailed Description

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, 2, and 4, embodiments of the present invention include an anti-slip seat tube assembly, comprising: middle pipe 1, seat pipe 2 and bayonet 3. The top end of the middle pipe 1 is provided with an opening. The side surface of the seat tube 2 is provided with a plurality of limiting grooves 4 distributed along the axial direction of the seat tube 2; the first end 5 of the seat tube 2 extends from the opening into the middle tube 1. The bayonet lock 3 is hinged on the middle tube 1, and the bayonet lock 3 is clamped in a limiting groove 4. The middle tube 1 is provided with a rotation limiting part 6, and the rotation limiting part 6 is used for limiting the rotation range of the bayonet 3, so that each limiting groove 4 and the bayonet 3 form a ratchet mechanism to limit the seat tube 2 to move towards the first end.

Specifically, the side wall of the limiting groove 4 close to the first end 5 of the seat tube 2 is provided with a guide inclined plane 7, and the side wall of the limiting groove 4 close to the second end 8 of the seat tube 2 is provided with a clamping and fixing surface 9. One side of the clamping end 10 of the bayonet 3 is provided with a slope 11 matched with the guide slope 7; the other side of the clamping end 10 is intended to abut against the clamping face 9.

A buffer surface 12 is arranged between the guide inclined surface 7 and the clamping and fixing surface 9, the buffer surface 12 comprises a plane or an arc surface, and the buffer surface 12 is respectively connected with the guide inclined surface 7 and the clamping and fixing surface 9 to form a limiting groove 4. The included angle between the guide inclined plane 7 and the axis of the seat tube 2 is 10-45 degrees. The included angle between the clamping surface 9 and the cross section of the seat tube 2 is-15 degrees to 10 degrees, preferably-12 degrees to-8 degrees (the minus sign indicates that the joint of the clamping surface 9 and the buffering surface 12 is higher than the joint of the clamping surface 9 and the side surface of the seat tube 2, and the plus sign indicates that the joint of the clamping surface 9 and the buffering surface 12 is lower than the joint of the clamping surface 9 and the side surface of the seat tube 2).

In the riding process of a user, a saddle is arranged at the second end of the seat tube 2, the saddle downwards presses the seat tube 2, the bayonet lock 3 abuts against the clamping and fixing surface 9 of the limiting groove 4, meanwhile, the limiting part 6 is rotated to limit the bayonet lock 3 to further rotate under the pushing of the clamping and fixing surface 9, and therefore the bayonet lock 3 is matched with the limiting groove 4 to enable the seat tube 2 to move towards the direction of the first end 5. The process does not depend on friction force, so the limiting structure has better reliability.

To facilitate height adjustment of the seat tube 2, the bayonet 3 is connected with a handle 13. In this embodiment, the bayonet 3 is connected to the handle by a connector 14. The connecting piece 14 can be fixedly connected with the handle 13, and can also be manufactured into an integrated structure with the handle 13 by adopting processes such as casting, 3D printing and the like.

The top of well pipe 1 includes a staple bolt 15, and staple bolt 15 is used for fastening well pipe 1 and seat pipe 2 to eliminate the space between well pipe 1 and the seat pipe 2, make bicycle in-process of riding, seat pipe 2 can not lead to because of the space rocks. The handle 13 is used not only to drive the rotation of the bayonet 3, but also to tighten or loosen the anchor ear 15.

Specifically, staple bolt 15 is the annular, and it is provided with the breach, and staple bolt 15 is provided with two otic placodes 16 in the position that closes on the breach, and two otic placodes 16 set up relatively, are located the both sides of breach respectively. When the distance between the two ear plates 16 is shortened, the hoop 15 enters a fastening state; when the distance between the two ear plates 16 increases, the anchor ear 15 enters the open state.

The connecting piece 14 respectively passes through the two ear plates 16, one end of the connecting piece 14 is connected with the handle 13, the other end of the connecting piece 14 is provided with a protruding ear plate limiting part 17 in a connecting way, and the ear plate limiting part 17 abuts against the outer side surface of one ear plate 16. The side of the handle 13 connected to the ear plate 16 is provided with an ear plate pusher 18. In this embodiment, the ear plate pushing member 18 is a protrusion structure for pushing the outer surface of the ear plate 16. The outer side surfaces of the two ear plates 16 have a certain included angle, so that the distance between the two outer side surfaces is gradually increased along the direction close to the center of the hoop 15. The center of the hoop 15 refers to the position of the circle center of the annular hoop 15.

By rotating the handle 13, the connecting member 14 can be made to rotate freely along its axis. Simultaneously with the rotation of the connecting member 14, the ear plate pushing member 18 on the handle 13 is also rotated along the axis of the connecting member 14, so that the distance between the ear plate pushing member 18 and the center of the hoop 15 gradually changes. Because one ear plate 16 of the two ear plates 16 is pushed by the ear plate pushing piece 18, and the position of the other ear plate 16 is limited by the ear plate limiting part 17, when the ear plate pushing piece 18 approaches the center of the hoop 15, the two ear plates 16 gradually approach under the pushing of the ear plate pushing piece 18, so that the fastening of the hoop 15 is realized; when the ear plate pushing piece 18 is far away from the center of the hoop 15, the ear plate pushing piece 18 gradually loosens the distance between the two ear plates 16, so that the hoop 15 is opened.

In one embodiment, the handle 13 is in the form of a rod, one end of which is fixedly connected to the connecting member 14. The ear plate lifters 18 are provided in the axial direction of the handle 13, which allows the handle 13 to be positioned at the side of the anchor ear 15 when the anchor ear 15 is in the fastened state. The handle 13 is folded up at the side of the anchor ear 15 so that the handle 13 does not hook the rider's clothing.

Bayonet 3 is arranged in a position between two lugs 16, bayonet 3 being hinged to a hoop 15 by means of a coupling 14. One end of the bayonet pin 3 is a clamping end 10, and the other end thereof is provided with a connecting hole 19. The coupling member 14 passes through the coupling hole 19, which constitutes a limited rotation coupling. The limited rotation connection means that the bayonet 3 can rotate freely within a certain range along the coupling piece 14.

In order to achieve the limited rotation connection, the connecting member 14 is provided with a forward direction limiting portion 20 and a reverse direction limiting portion 21, and the bayonet 3 is provided with a forward direction abutting portion 22 and a reverse direction abutting portion 23. The forward stopper 20 and the forward abutting portion 22 constitute a forward stopper mechanism, and the reverse stopper 21 and the reverse abutting portion 23 constitute a reverse stopper mechanism. The forward and reverse limiting mechanisms serve to limit the range of rotation between the coupling member 14 and the bayonet 3.

In one embodiment, the connector 14 includes a D-shaped connector segment 24 in cross-section, with the sides of the connector segment 24 including curved regions 25 and flat regions 26. The curved surface area 25 is a circumferential surface having a diameter adapted to the inner diameter of the connection hole 19. The two sides of the planar region 26 are respectively the forward stopper 20 and the reverse stopper 21. A projection structure 27 is provided on the inner surface of the coupling hole 19 of the bayonet 3. The protruding structure 27 extends along the axial direction of the connecting hole 19, and has a ridge shape with a forward abutting portion 22 and a reverse abutting portion 23 on both sides.

As shown in fig. 3 and 6, in the process of counterclockwise rotation of the bayonet 3, at the joint of the forward limiting portion 20 and the forward abutting portion 22, the handle 13 drives the connecting member 14 to rotate counterclockwise, and simultaneously, the forward limiting portion 20 pushes the forward abutting portion 22, so that the bayonet 3 rotates counterclockwise.

In the process of clockwise rotation of the bayonet 3, the reverse limiting portion 21 and the reverse abutting portion 23 are connected, the handle 13 drives the connecting piece 14 to rotate clockwise, and meanwhile, the reverse limiting portion 21 pushes the forward abutting portion 22, so that the bayonet 3 rotates clockwise.

In one embodiment, the positions of the positive direction stopper portion 20 and the positive direction abutting portion 22 satisfy the following condition: when the positive direction stopper 20 meets the positive direction abutting portion 22, the locking end 10 of the locking pin 3 and the handle 13 point in the same direction. This allows the handle 13 to be positioned laterally of the anchor ear 15 when the latch 3 is engaged in the retaining groove 4, and the anchor ear 15 is in the fastened state.

During the process of adjusting the height of the seat tube 2, the connecting piece 14 is driven to rotate through the handle 13, and then the bayonet 3 is driven to rotate. The height adjustment of the seat tube 2 needs to be done in a non-riding state.

As shown in fig. 3 to 6, in the riding mode, the handle 13 is located at the side of the hoop 15, and the forward limiting portion 20 of the connecting member 14 is in contact with the forward abutting portion 22 of the bayonet 3, and the handle 13 is located at a position to secure the hoop 15.

As shown in fig. 3, 4 and 6, in the process of adjusting the height of the seat tube 2, the anchor ear 15 needs to be opened first. In the process of opening the hoop 15, the handle 13 is rotated clockwise, so that the connecting piece 14 rotates clockwise, and the forward limiting part 20 is separated from the contact with the forward abutting part 22. During the clockwise rotation of the handle 13, the anchor ear 15 is gradually opened.

After the handle 13 is rotated clockwise by a certain angle, the reverse stopper portion 21 of the coupling member 14 meets the reverse abutment portion 23 of the bayonet 3, so that the coupling member 14 drives the bayonet 3 to rotate clockwise. Thereby disengaging the catching end 10 of the bayonet 3 from the retaining groove 4.

In the above-described process, the anchor 15 is first opened and only then the bayonet 3 is driven in rotation, because of the limited rotational connection between the coupling element 14 and the bayonet 3. Because bayonet lock 3 need slightly jacking seat pipe 2 in the clockwise rotation process, consequently open staple bolt 15 at first and make bayonet lock 3 more hold jacking seat pipe 2, the bayonet lock 3 of being convenient for clockwise rotation breaks away from in spacing groove 4. In addition, open the staple bolt earlier and then rotate bayonet lock 3 for slightly rotating handle 13 can not lead to bayonet lock 3 to drop from spacing groove 4, has avoided seat pipe 2 gliding. The handle 13 has a length and therefore a large moment arm, making it easier for the handle 13 to drive the coupling member 14 and thus the bayonet 3 in rotation.

After the locking end 10 is disengaged from the retaining groove 4, the user can adjust the seat tube 2 to a desired height and rotate the handle 13 counterclockwise, so that the locking pin 3 rotates counterclockwise and the locking end 10 is locked in the designated retaining groove 4 to prevent the seat tube 2 from falling. During the counterclockwise rotation of the handle 13, the anchor ear 15 is gradually changed from the opened state to the fastened state.

In the above-mentioned adjustment process, need not fasten through the bolt to provide frictional force, this makes the adjustment process comparatively laborsaving. In the riding process, the bayonet lock 3 is abutted against the clamping and fixing surface 9 of the limiting groove 4, the bearing capacity of the limiting structure depends on the mechanical strength of the bayonet lock 3 and the mechanical strength of the limiting groove 4, and compared with the quick release for limiting by adopting friction force, the limiting structure has better bearing capacity and reliability.

The top end of the middle pipe 1 is provided with a first gap. The first notch serves as a rotation restricting portion 6 for restricting a rotation range of the bayonet 3. When the bayonet 3 is clamped in the limiting groove 4, the bayonet 3 is abutted against the rotary limiting part 6, so that the clamping surface 9 of the limiting groove 4 can not push the bayonet 3 to further rotate.

In addition, the inner edge of the hoop 15 is provided with a limit bulge 28; the limit projection 28 is clamped in a second notch 29 at the top end of the middle pipe 1. The limiting protrusion 28 is matched with the second notch 29, so that the hoop 15 can be accurately installed at the top end of the middle pipe 1, and the hoop 15 can be conveniently assembled to the top end of the middle pipe 1 in the production process.

The above-mentioned limit projection 28 also has the function of guiding. Specifically, the limiting protrusion 28 extends towards the inner side of the middle tube 1, and the side wall of the seat tube 2 is provided with a guide groove 30 matched with the limiting protrusion 28. The guide groove 30 extends in the axial direction of the seat pipe 2. The limiting protrusion 28 is clamped in the guide groove 30, the limiting protrusion 28 is used for preventing the seat tube 2 from rotating, the limiting groove 4 of the seat tube 2 only can face the bayonet 3, and the limiting protrusion 28 is matched with the guide groove 30, so that the adjusting process of the seat tube 2 is easier.

The present embodiments also include a vehicle that includes the above-described anti-slip seat tube assembly. The vehicle is a bicycle, a moped or an electric motorcycle.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. An anti-slip seat tube assembly, comprising:

the top end of the middle pipe is provided with an opening;

2. The anti-slip seat tube assembly according to claim 1, wherein the middle tube is provided with a rotation limiting portion for limiting a rotation range of the locking pin.

3. An anti-slip seat tube assembly according to claim 2, wherein the rotation limiting portion comprises a first notch disposed at a top end of the middle tube.

4. An anti-slip seat tube assembly according to claim 1, wherein the side wall of the limiting groove adjacent the first end of the seat tube is provided with a guide slope, and the side wall of the limiting groove adjacent the second end of the seat tube is provided with a clamping face.

5. The anti-slip seat tube assembly as set forth in claim 4, wherein the clamping end of the clamping pin is provided with a slope adapted to the guiding slope; the clamping end is used for abutting against the clamping surface of the limiting groove.

6. An anti-slip seat tube assembly according to claim 1, wherein the top of the seat tube includes a hoop; the hoop is used for fastening the seat tube and the middle tube; the bayonet lock is connected with a handle, and the handle is used for fastening or opening the hoop.

7. An anti-slip seat tube assembly according to claim 6, wherein the bayonet is connected to the handle by a connector; the connecting piece and the clamping pin form a limited rotation connection.

8. The anti-slip seat tube assembly according to claim 7, wherein the connecting member is provided with a forward limiting portion and a reverse limiting portion, and the snap pin is provided with a forward abutting portion and a reverse abutting portion; the forward limiting part and the forward abutting part form a forward limiting mechanism, and the reverse limiting part and the reverse abutting part form a reverse limiting mechanism; the forward limiting mechanism and the reverse limiting mechanism are used for limiting the rotation range between the connecting piece and the clamping pin.

9. The anti-slip seat tube assembly according to claim 8, wherein the connecting member comprises a connecting section with a D-shaped cross section, and the bayonet is provided with a connecting hole; the connecting section penetrates through the connecting hole, and the side surface of the connecting section comprises a plane area and a curved surface area; the two sides of the plane area are respectively provided with the forward limiting part and the reverse limiting part; the inner surface of the connecting hole is provided with a convex structure; the convex structure faces the plane area of the connecting section; the two side surfaces of the protruding structure are respectively the positive abutting part and the reverse abutting part.

10. The anti-slip seat tube assembly as set forth in claim 7, wherein the anchor ear includes a notch, and an ear plate is disposed adjacent to the notch; the handle comprises an ear plate pushing piece used for pushing the ear plate, and the handle drives the hoop to be fastened or opened through the ear plate pushing piece.

11. An anti-slip seat tube assembly according to claim 6, wherein the inner edge of the hoop is provided with a limiting protrusion; the limiting bulge is clamped in the second notch at the top end of the middle pipe.

12. An anti-slip seat tube assembly according to claim 11, wherein the restraining projection extends inwardly of the center tube; the side wall of the seat tube is provided with a guide groove matched with the limiting bulge; the guide groove extends in the axial direction of the seat tube.

13. A vehicle comprising the anti-skid seating tube assembly of any of claims 1-12.