Vertical pipe folding joint

Abstract

The vertical pipe folding connector comprises a base, a rotating seat, a rotating shaft, a handle, a rotating shaft elastic reset piece and an internal expansion type brake mechanism, meshing teeth on the surface of the rotating shaft are matched with a rotating shaft hole in the base and a connecting hole in the rotating seat respectively, and the rotating shaft elastic reset piece is arranged between the rotating shaft and the base or the rotating seat; when the rotating shaft overcomes the elastic force of the rotating shaft elastic reset piece to axially move relative to the base or the rotating seat, the meshing teeth on the surface of the rotating shaft are at least disengaged from one of the rotating shaft holes in the base or the connecting holes in the rotating seat, and the base and the rotating seat can rotate relative to each other. The internal expansion type brake mechanism is hinged to the eccentric cam at one end of the handle, the handle can drive the internal expansion type brake mechanism to axially move relative to the rotating shaft, one end of the rotating shaft is expanded, the rotating shaft is axially fixed to the base or the rotating seat, and the base and the rotating seat are relatively fixed. The vertical pipe folding connector is convenient to operate and good in safety.

Description

Technical Field

[0001] The present invention relates to the technical fields of bicycles, electric bicycles and scooters, and more particularly to a vertical tube folding joint. Background Art

[0002] In order to make the handle angle more adaptable to the gripping use of people with different arm lengths, Chinese Utility Model Patent CN200992282Y discloses an adjustable-angle bicycle riser, which includes a vertical tube, a horizontal tube and a shaft rod. Both ends of the horizontal tube are respectively provided with a clamp. One of the clamps is locked with a handle. The vertical tube and the shaft rod are separately formed. One end of the vertical tube is provided with a connecting portion having a through hole. Two arc-shaped tabs protrude from both sides of the clamp at the other end of the horizontal tube. The connecting portion of the vertical tube is inserted into the accommodation space between the two tabs. Through holes are respectively provided on the two tabs opposite to the through hole of the connecting portion. The shaft rod passes through the through holes of the two tabs and the through hole of the connecting portion of the vertical tube and is fixedly connected to the connecting portion. The horizontal tube is pivotally connected to the shaft rod through the through holes on the tabs and can pivot around the shaft rod. In the present invention, the horizontal tube is pivotally connected to the shaft rod by means of the tabs and can pivot up and down relative to the vertical tube. Riders of different heights can adjust the angle at will according to comfort.

[0003] However, for the above adjustable-angle bicycle riser, it is relatively complicated to loosen the clamp when adjusting the angle.

[0004] Chinese Patent Document CN218258548U discloses an adjustable-angle and foldable stem, including an upper stem, a lower stem, a rotating upper seat, a rotating base, a left locking block, a right locking block, a locking rod, and a cam locking handle; the rotating upper seat is provided at the lower end of the upper stem, the rotating base is provided at the upper end of the lower stem, the rotating base is provided with a left clamping portion and a right clamping portion arranged at intervals left and right, a clamping space is formed between the left clamping portion and the right clamping portion, the rotating upper seat is provided with a connecting portion, the connecting portion extends into the clamping space, the left clamping portion and the right clamping portion are respectively provided with a left first through hole and a right first through hole, the connecting portion is provided with a second through hole axially communicating with the left first through hole and the right first through hole, the left first through hole and the right first through hole are respectively provided with a first female bevel gear portion and a second female bevel gear portion, and the left and right sides of the second through hole are respectively provided with a first female circular gear portion and a second female circular gear portion; the left locking block penetrates into the left side of the left first through hole and the second through hole, the right locking block penetrates into the right side of the right first through hole and the second through hole, the left locking block is provided with a first male bevel gear portion meshing with the first female bevel gear portion and a first male circular gear portion meshing with the first female circular gear portion, the right locking block is provided with a second male bevel gear portion meshing with the second female bevel gear portion and a second male circular gear portion meshing with the second female circular gear portion; the locking rod axially penetrates through the left locking block, the right locking block, and the rotating upper seat, and the cam locking handle is connected to one end of the locking rod. When the cam locking handle is loosened, the left locking block and the right locking block move outward in the opposite direction, so that the first male bevel gear portion and the second male bevel gear portion are respectively disengaged from the first female bevel gear portion and the second female bevel gear portion. At this time, the rotating upper seat can rotate relative to the rotating base to realize angle adjustment or folding of the upper stem. However, if the cam locking handle is inadvertently or accidentally opened, the upper stem is unstable, posing a safety risk. Summary of the Invention

[0005] The purpose of the present invention is to provide a vertical tube folding joint, which is convenient for angle adjustment and has high safety.

[0006] The technical solution adopted by the vertical tube folding joint disclosed in the present invention is:

[0007] A vertical pipe folding joint includes a base, a rotating seat and a rotating shaft. The base is provided with a toothed rotating shaft hole, the rotating seat is provided with a toothed connecting hole, the outer surface of the rotating shaft is provided with meshing teeth, and the meshing teeth on the surface of the rotating shaft are respectively matched with the rotating shaft hole on the base and the connecting hole on the rotating seat. The rotating shaft can axially move in the rotating shaft hole and the connecting hole. It also includes a handle, a rotating shaft elastic reset member and an internal expansion braking mechanism. The rotating shaft elastic reset member is arranged between the rotating shaft and the base or the rotating seat and is used to axially move the rotating shaft relative to the base or the rotating seat. When the rotating shaft axially moves relative to the base or the rotating seat against the elastic force of the rotating shaft elastic reset member, at least one of the meshing teeth on the surface of the rotating shaft disengages from the rotating shaft hole on the base or the connecting hole on the rotating seat. The base and the rotating seat can rotate relative to each other. The rotating shaft is provided with a central hole, and one end of the rotating shaft is provided with a notch. One end of the handle is provided with an eccentric cam. The internal expansion braking mechanism is hinged to the eccentric cam. The handle can drive the internal expansion braking mechanism to axially move relative to the rotating shaft, so that one end of the rotating shaft expands, axially fixing the rotating shaft to the base or the rotating seat, and the base and the rotating seat are relatively fixed.

[0008] As a preferred solution, the base includes a seat body, a first ring body and a second ring body. The first ring body and the second ring body are arranged on both sides of one end of the seat body. The rotating shaft hole is located on the first ring body and the second ring body. The rotating seat is arranged at one end of the seat body and is located between the first ring body and the second ring body.

[0009] As a preferred solution, the outer surface of the rotating shaft is provided with a smooth annular surface, and the annular surface separates the meshing teeth on the outer surface of the rotating shaft.

[0010] As a preferred solution, the outer surface of the rotating shaft is provided with a sunk groove, the rotating shaft elastic reset member is arranged in the sunk groove, one end of the rotating shaft elastic reset member abuts against the side wall of the sunk groove of the rotating shaft, and the other end abuts against the base or the rotating seat.

[0011] As a preferred solution, it further includes a spring sleeve rod. The rotating shaft elastic reset member is a spring. The spring sleeve rod is provided with a rod portion and a head portion. The rotating shaft elastic reset member is sleeved on the rod portion and abuts against the head portion. The head portion of the spring sleeve rod abuts against the side surface of the base or the rotating seat.

[0012] As a preferred solution, the internal expansion braking mechanism includes a pull rod and a sleeve. The outer surface of the sleeve is frustum-shaped, the central hole of the rotating shaft is frustum-shaped, the sleeve is arranged in the central hole of the rotating shaft, a sleeve elastic reset member is arranged between the sleeve and the rotating shaft, one end of the sleeve elastic reset member abuts against the sleeve, and one end abuts against the rotating shaft. The pull rod is arranged in the sleeve. One end of the pull rod is hinged to the eccentric cam of the handle. The handle drives the pull rod to move, overcomes the elastic force of the sleeve elastic reset member, and drives the large head end of the sleeve to expand the end of the rotating shaft with the notch, so as to axially fix the rotating shaft relative to the base or the rotating seat.

[0013] As a preferred solution, an outer semi-cylindrical groove is provided on the outer surface of the sleeve, an inner semi-cylindrical groove is provided on the inner wall of the end of the rotating shaft with a notch, and the sleeve elastic reset member is arranged in the outer semi-cylindrical groove of the sleeve and the inner semi-cylindrical groove of the rotating shaft. One end of the sleeve elastic reset member abuts against the inner side wall of the inner semi-cylindrical groove of the rotating shaft, and the other end abuts against the side wall of the outer semi-cylindrical groove of the sleeve.

[0014] As a preferred solution, a concave platform is provided in the central hole of the rotating shaft, the sleeve elastic reset member is a spring, the sleeve elastic reset member is arranged in the central hole of the rotating shaft, sleeved on the pull rod, one end of which abuts against the concave platform of the sleeve, and the other end abuts against one end of the sleeve.

[0015] As a preferred solution, a limiting member is further included, and the limiting member is arranged at one end of the rotating shaft for limiting the rotating shaft to pass through the rotating shaft hole on the base and the connecting hole on the rotating seat in an axial direction.

[0016] As a preferred solution, a cushion block is further included, and the cushion block is arranged between the other end of the rotating shaft and the handle. The outer dimension of the cushion block is larger than the rotating shaft hole on the base and the connecting hole on the rotating seat. The cushion block is provided with a through hole, and the pull rod passes through the through hole of the cushion block and is hinged to the handle.

[0017] The beneficial effects of a vertical pipe folding joint disclosed by the present invention are as follows: when the handle is opened, the internal expansion type braking mechanism moves, and the internal expansion type braking mechanism does not squeeze the rotating shaft inside the rotating shaft, the notch of the rotating shaft contracts, pushing the handle or the rotating shaft, and the rotating shaft axially moves relative to the base or the rotating seat against the elastic force of the rotating shaft elastic reset member. The meshing teeth on the surface of the rotating shaft are disengaged from at least one of the rotating shaft hole on the base and the connecting hole on the rotating seat, and the base and the rotating seat rotate relative to each other for adjusting the angle of the vertical pipe, which is convenient to operate. When pushing the handle or the rotating shaft stops, under the action of the elastic force of the rotating shaft elastic reset member, the rotating shaft axially moves relative to the base or the rotating seat, and the meshing teeth on the surface of the rotating shaft are respectively engaged with the rotating shaft hole on the base and the connecting hole on the rotating seat, and the angle of the vertical pipe is relatively fixed and cannot be adjusted any more, having an automatic locking effect. When the handle is locked, the handle drives the internal expansion type braking mechanism to axially move relative to the rotating shaft, so that one end of the rotating shaft expands, axially fixing the rotating shaft to the base or the rotating seat, and the base and the rotating seat are relatively fixed, improving the reliability of locking of the vertical pipe folding joint and being convenient for angle adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional schematic diagram of the vertical pipe folding joint of the present invention.

[0019] Figure 2 is an exploded schematic diagram of the vertical pipe folding joint of the present invention.

[0020] Figure 3 is a cross-sectional schematic diagram of the vertical pipe folding joint of the present invention.

[0021] Figure 4 This is a schematic structural diagram of the rotating shaft and the internal expansion braking mechanism in the vertical pipe folding joint of the present invention.

[0022] Figure 5 This is a schematic structural diagram of the rotating shaft of the vertical pipe folding joint of the present invention. Specific embodiments

[0023] A vertical pipe folding joint includes a base, a rotating seat and a rotating shaft. A toothed rotating shaft hole is provided on the base, and a toothed connecting hole is provided on the rotating seat. Meshing teeth are provided on the outer surface of the rotating shaft. The meshing teeth on the surface of the rotating shaft are respectively matched with the rotating shaft hole on the base and the connecting hole on the rotating seat. The rotating shaft can axially move in the rotating shaft hole and the connecting hole. It also includes a handle, a rotating shaft elastic reset member and an internal expansion braking mechanism. The rotating shaft elastic reset member is arranged between the rotating shaft and the base or the rotating seat and is used to axially move the rotating shaft relative to the base or the rotating seat. When the rotating shaft axially moves relative to the base or the rotating seat against the elastic force of the rotating shaft elastic reset member, at least one of the meshing teeth on the surface of the rotating shaft disengages from the rotating shaft hole on the base or the connecting hole on the rotating seat. The base and the rotating seat can rotate relative to each other. The rotating shaft is provided with a central hole, and a notch is provided at one end of the rotating shaft. An eccentric cam is provided at one end of the handle. The internal expansion braking mechanism is hinged to the eccentric cam. The handle can drive the internal expansion braking mechanism to axially move relative to the rotating shaft, causing one end of the rotating shaft to expand and axially fixing the rotating shaft to the base or the rotating seat, and the base and the rotating seat are relatively fixed.

[0024] Open the handle, the internal expansion braking mechanism moves, the internal expansion braking mechanism does not squeeze the rotating shaft inside the rotating shaft, the notch of the rotating shaft shrinks, push the handle or the rotating shaft, the rotating shaft axially moves relative to the base or the rotating seat against the elastic force of the rotating shaft elastic reset member, and at least one of the meshing teeth on the surface of the rotating shaft disengages from the rotating shaft hole on the base or the connecting hole on the rotating seat. The base and the rotating seat rotate relative to each other to adjust the angle of the vertical pipe. Stop pushing the handle or the rotating shaft. Under the action of the elastic force of the rotating shaft elastic reset member, the rotating shaft axially moves relative to the base or the rotating seat, and the meshing teeth on the surface of the rotating shaft are respectively engaged with the rotating shaft hole on the base and the connecting hole on the rotating seat. The angle of the vertical pipe is relatively fixed and cannot be adjusted anymore, having the effect of automatic locking. Lock the handle, the handle drives the internal expansion braking mechanism to axially move relative to the rotating shaft, causing one end of the rotating shaft to expand and axially fixing the rotating shaft to the base or the rotating seat, and the base and the rotating seat are relatively fixed, improving the reliability of locking the vertical pipe folding joint and facilitating angle adjustment.

[0025] The following further elaborates and explains the present invention in conjunction with specific embodiments and the accompanying drawings of the specification:

[0026] Please refer to Figure 1, A vertical pipe folding joint, comprising a base 10, a rotating seat 20, a rotating shaft 40, a handle 30, a rotating shaft elastic reset member 71 and an internal expansion type braking mechanism. In this embodiment, the base 10 is welded or integrally formed with the grip vertical pipe 100, and the rotating seat 20 is threadedly connected to the front fork vertical pipe 110 through a nut 120 to fixedly connect the rotating seat 20 and the front fork vertical pipe 110. In other embodiments, the positions of the rotating seat 20 and the base 10 can be exchanged, that is, the base is fixedly connected to the front fork vertical pipe, and the rotating seat is fixedly connected to the grip vertical pipe 100.

[0027] Please refer to Figure 2 and Figure 3 , The base 10 includes a seat body 11, a first ring body 12, a second ring body 13 and a toothed rotating shaft hole 14. The first ring body 12 and the second ring body 13 are provided on both sides of one end of the seat body 11, and the rotating shaft hole 14 is located on the first ring body 12 and the second ring body 13. The rotating seat 20 is provided at one end of the seat body 11, between the first ring body 12 and the second ring body 13, and a toothed connection hole 21 is provided on the rotating seat 20.

[0028] The outer surface of the rotating shaft 40 is provided with meshing teeth 41 and a smooth annular surface 42. The meshing teeth 41 on the surface of the rotating shaft 40 are respectively matched with the rotating shaft hole 14 on the base 10 and the connection hole 21 on the rotating seat 20. The annular surface 42 separates the meshing teeth 41 on the outer surface of the rotating shaft 40. When the meshing teeth 41 on the surface of the rotating shaft 40 are respectively meshed with the rotating shaft hole 14 on the base 10 and the connection hole 21 on the rotating seat 20, the base 10 and the rotating seat 20 are relatively fixed and cannot rotate relative to each other. When the rotating shaft 40 moves axially, since the annular surface 42 separates the meshing teeth 41 on the outer surface of the rotating shaft 40, at least one of the meshing teeth 41 on the surface of the rotating shaft 40 is disengaged from the rotating shaft hole 14 on the base 10 or the connection hole 21 on the rotating seat 20. In this embodiment, the meshing teeth 41 on the surface of the rotating shaft 40 are disengaged from the rotating shaft hole 14 on the base 10, and the rotating shaft 40 and the rotating seat 20 rotate synchronously. The rotating shaft 40 and the rotating seat 20 can rotate relative to the base 10 to adjust the angle between the front fork vertical pipe 110 and the grip vertical pipe 100. Please refer to Figure 2 and Figure 4, the rotating shaft 40 is provided with a central hole 43, the central hole 43 is frustum-shaped, and the surface of the rotating shaft 40 is also provided with a sunk groove 44. The rotating shaft elastic resetting member 71 is arranged in the sunk groove 44. When the rotating shaft 40 is installed in the rotating shaft hole 14 on the base 10 and the connecting hole 21 on the rotating seat 20, one end of the rotating shaft elastic resetting member 71 abuts against the side wall of the sunk groove 44 of the rotating shaft 40, and the other end abuts against the base 10 or the rotating seat 20. In this embodiment, the other end of the rotating shaft elastic resetting member 71 abuts against the inner side surface of the first ring body 12 of the base 10. When the rotating shaft 40 rotates relative to the base 10, in order to reduce the friction between the rotating shaft elastic resetting member 71 and the inner side surface of the first ring body 12, a spring sleeve rod 72 is also arranged in the sunk groove 44. The spring sleeve rod 72 is provided with a rod portion and a head portion. The rotating shaft elastic resetting member 71 is a spring. The rotating shaft elastic resetting member 71 is sleeved on the rod portion and abuts against the head portion. The head portion of the spring sleeve rod 72 abuts against the inner side surface of the first ring body 12 of the base 10, making the rotation of the rotating shaft elastic resetting member 71, the spring sleeve rod 72 and the rotating shaft 40 relative to the base 10 smoother. One end of the rotating shaft 40 is provided with a notch 45, a limiting member mounting hole 46 and an inner semi-cylindrical groove 47. The inner semi-cylindrical groove 47 is arranged on the inner wall of the end of the rotating shaft 40 provided with the notch 45. A limiting member 80 is arranged in the limiting member mounting hole 46. To improve the expansion effect of the rotating shaft 40, the notch 45 penetrates through the rotating shaft 40. Please refer to Figure 5 .

[0029] The internal expansion braking mechanism includes a pull rod 52 and a sleeve 51. One end of the pull rod 52 is provided with an external thread 521, and the other end is provided with a boss 522. The outer surface of the sleeve 51 is frustum-shaped and is matched with the central hole 43 of the rotating shaft 40. The sleeve 51 is provided with a pull rod hole 511. One end of the pull rod hole 511 is provided with a step 513. The pull rod 52 is arranged in the pull rod hole 511. The step 513 at one end of the pull rod hole 511 is used to abut against the boss 522 of the pull rod 52. The outer surface of the sleeve 51 is provided with an outer semi-cylindrical groove 512. The sleeve 51 is arranged in the central hole 43 of the rotating shaft 40. A sleeve elastic resetting member 60 is arranged in the outer semi-cylindrical groove 512 of the sleeve 51 and the inner semi-cylindrical groove 47 of the rotating shaft 40. One end of the sleeve elastic resetting member 60 abuts against the inner side wall of the inner semi-cylindrical groove 47 of the rotating shaft 40, and the other end abuts against the side wall of the outer semi-cylindrical groove 512 of the sleeve 51.

[0030] One end of the handle 30 is provided with an eccentric cam. The eccentric cam is provided with an eccentric hole 31 and a groove 32. An articulated shaft 33 is arranged in the eccentric hole 31. An internal threaded hole is arranged on the articulated shaft 33. The external threaded hole at one end of the pull rod 52 passes through the groove 32 of the eccentric cam 31 and the through hole of the spacer 90 and is threadedly connected to the internal threaded hole on the articulated shaft 33. The spacer 90 is arranged between the other end of the rotating shaft 40 and the handle 30. The outer dimension of the spacer 30 is larger than the rotating shaft hole 14 on the base 10. By using the spacer 90 and the limiting member 80, the rotating shaft 40 is arranged in the rotating shaft hole 14 on the base 10 and the connecting hole 21 on the rotating seat 20 and cannot be disengaged therefrom. The axial movement range of the rotating shaft 40 is limited to the sum of the distances between the spacer 90 and the second ring body 13 and between the limiting member 80 and the first ring body 12.

[0031] Rotate the handle 30 to lock the handle 30. The eccentric cam drives the pull rod 52 to move. The boss 522 of the pull rod 52 abuts against the step 513 at one end of the pull rod hole 511 on the sleeve 51, driving the sleeve 51 to move against the elastic restoring force of the sleeve elastic restoring member 60, driving the movement of the sleeve 60. The large head end of the sleeve 60 expands one end of the rotating shaft 40 provided with a notch 45, causing the rotating shaft 40 to expand and abut tightly against the base 10 or / and the rotating seat 20. The frictional force therebetween axially fixes the rotating shaft 40 to the base 10 or / and the rotating seat 20. The meshing teeth 41 on the surface of the rotating shaft 40 are respectively meshed with the rotating shaft hole 14 on the base 10 and the connecting hole 21 on the rotating seat 20, radially fixing the rotating shaft 40 to the base 10 and the rotating seat 20. Rotate the handle 30 to open the handle 30. The elastic restoring force of the sleeve elastic restoring member 60 drives the movement of the sleeve 60. The large head end of the sleeve 60 moves towards the large head end of the tapered central hole 43 of the rotating shaft 40, and the sleeve 60 no longer expands the rotating shaft 40. At this time, under the action of the rotating shaft elastic restoring member 71, the meshing teeth 41 on the surface of the rotating shaft 40 are still meshed with the rotating shaft hole 14 on the base 10 and the connecting hole 21 on the rotating seat 20, and the rotating shaft 40 is radially fixed to the base 10 and the rotating seat 20. Press the handle 30 or the spacer 90 to axially move the rotating shaft 40 against the elastic restoring force of the rotating shaft elastic restoring member 71. The meshing teeth 41 on the surface of the rotating shaft 40 are disengaged from the rotating shaft hole 14 on the base 10, and the rotating shaft 40 rotates synchronously with the rotating seat 20. The rotating shaft 40 and the rotating seat 20 can rotate relative to the base 10, which is used to adjust the angle between the front fork vertical tube 110 and the grip vertical tube 100. The angle adjustment is convenient. Even if the handle is accidentally opened, the rotating shaft 40 is still radially fixed to the base 10 and the rotating seat 20, and the safety is good.

[0032] In other embodiments, the installation position of the sleeve elastic restoring member 60 is adjusted. A concave platform is provided in the central hole of the rotating shaft. The sleeve elastic restoring member is a spring. The sleeve elastic restoring member is arranged in the central hole of the rotating shaft, sleeved on the pull rod, with one end abutting against the concave platform of the sleeve and the other end abutting against one end of the sleeve, and the same effect can be achieved.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A vertical pipe folding joint, comprising a base, a rotating seat and a rotating shaft, wherein the base is provided with a rotating shaft hole with teeth, the rotating seat is provided with a connecting hole with teeth, the outer surface of the rotating shaft is provided with meshing teeth, the meshing teeth on the surface of the rotating shaft are respectively matched with the rotating shaft hole on the base and the connecting hole on the rotating seat, and the rotating shaft can move axially in the rotating shaft hole and the connecting hole, characterized in that: The cam is hingedly connected to the eccentric cam, and the handle can drive the internal expansion brake mechanism to move axially relative to the shaft, so that one end of the shaft can expand, thereby axially fixing the shaft and the base or the rotating seat, and the base and the rotating seat can rotate relative to each other.

2. The vertical pipe folding joint according to claim 1, characterized in that: The base includes a seat body, a first ring body and a second ring body, wherein the first ring body and the second ring body are arranged on both sides of one end of the seat body, the shaft hole is located on the first ring body and the second ring body, and the rotating seat is arranged at one end of the seat body and located between the first ring body and the second ring body.

3. The vertical pipe folding joint according to claim 1, characterized in that: The outer surface of the rotating shaft is provided with a smooth annular surface, and the annular surface separates the meshing teeth on the outer surface of the rotating shaft.

4. The vertical pipe folding joint according to claim 1, characterized in that: The outer surface of the rotating shaft is provided with a recessed groove, and the rotating shaft elastic reset member is arranged in the recessed groove. One end of the rotating shaft elastic reset member abuts against the side wall of the rotating shaft recessed groove, and the other end abuts against the base or the rotating seat.

5. The vertical pipe folding joint according to claim 4, characterized in that: It also includes a spring sleeve rod, the shaft elastic reset piece is a spring, the spring sleeve rod is provided with a rod portion and a head portion, the shaft elastic reset piece is sleeved on the rod portion and abuts against the head portion, and the head portion of the spring sleeve rod abuts against the side surface of the base or the rotating seat.

6. The vertical pipe folding joint according to claim 1, characterized in that: The internal expansion brake mechanism includes a pull rod and a sleeve. The outer surface of the sleeve is a frustum-shaped, and the center hole of the rotating shaft is a frustum-shaped. The sleeve is arranged in the center hole of the rotating shaft. A sleeve elastic reset member is provided between the sleeve and the rotating shaft. One end of the sleeve elastic reset member abuts the sleeve, and the other end abuts the rotating shaft. The pull rod is arranged in the sleeve, and one end of the pull rod is hingedly connected to the eccentric cam of the handle. The handle drives the pull rod to move, overcomes the elastic force of the sleeve elastic reset member, and drives the big end of the sleeve to expand the end of the rotating shaft with a notch, so that the rotating shaft is axially fixed relative to the base or the rotating seat.

7. The vertical pipe folding joint according to claim 6, characterized in that: An outer semi-cylindrical groove is provided on the outer surface of the sleeve, an inner semi-cylindrical groove is provided on the inner wall of one end of the rotating shaft with a notch, the sleeve elastic reset member is arranged in the outer semi-cylindrical groove of the sleeve and the inner semi-cylindrical groove of the rotating shaft, one end of the sleeve elastic reset member abuts against the inner side wall of the inner semi-cylindrical groove of the rotating shaft, and the other end abuts against the side wall of the outer semi-cylindrical groove of the sleeve.

8. The vertical pipe folding joint according to claim 6, characterized in that: A recessed platform is provided in the center hole of the rotating shaft. The sleeve elastic reset member is a spring. The sleeve elastic reset member is provided in the center hole of the rotating shaft and sleeved on the pull rod. One end of the sleeve elastic reset member abuts against the recessed platform of the sleeve and the other end abuts against one end of the sleeve.

9. The vertical pipe folding joint according to claim 1, characterized in that: It also includes a limiting member, which is arranged at one end of the rotating shaft and is used to limit the rotating shaft from passing through the rotating shaft hole on the base and the connecting hole on the rotating seat in an axial direction.

10. The vertical pipe folding joint according to claim 9, characterized in that: It also includes a cushion block, which is arranged between the other end of the rotating shaft and the handle. The outer dimensions of the cushion block are larger than the rotating shaft hole on the base and the connecting hole on the rotating seat. The cushion block is provided with a through hole, and the pull rod passes through the through hole of the cushion block and is hingedly connected to the handle.

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