CN112516601B - Adjustable mountain road pulley - Google Patents

Abstract

The invention discloses an adjustable mountain pulley, comprising: a vehicle body; the front end mechanism comprises a mounting seat arranged at the bottom of the front side of the vehicle body, a bogie which is arranged on the mounting seat in a left-right rotating manner, front wheels arranged at the bottom end of the bogie, and a handlebar which is arranged at the top end of the bogie in a left-right symmetrical manner and is of a nonlinear structure, wherein the top end of the bogie is provided with a locking structure for locking the handlebar on the bogie, and the handlebar is provided with a control structure for releasing the locking structure and allowing the handlebar to turn back and forth; a seat mechanism including a rail frame extending in the front-rear direction and fixed to the rear side in the vehicle body, a seat slidably mounted on the rail frame; and the rear wheel assembly is arranged at the bottom of the rear side of the vehicle body. The invention has the advantages that the transverse height and the front-back position of the seat can be adjusted, so that the gravity center can not be greatly moved backwards when a user leans backwards to lower the gravity center.

Description

Adjustable mountain road pulley

Technical Field

The invention relates to an adjustable mountain pulley, which is mainly applied to the technical field of outdoor sports equipment.

Background

The mountain tackle arranges a jungle slide in the region with a slightly slow slope according to the mountain terrain, and passengers take the non-power road polar vehicle, and rely on the gravity factor to control the tackle to slide down to the terminal point.

The applicant previously applied for a scooter of CN201920953685.X, which comprises a scooter body, front wheels, rear wheels and a steering mechanism, wherein the steering mechanism comprises handrails, a steering shaft and a rotating seat, the bottom of the scooter body is provided with a storage cavity, the rotating seat is arranged in the storage cavity and rotates front and back relative to the scooter body, the upper end of the steering shaft extends to the upper part of a sitting area and is connected with the handrails, the lower end of the steering shaft penetrates through the scooter body and extends into the storage cavity to be connected with the front wheels, and the steering shaft is rotatably installed on the rotating seat. The front wheels are rotated forwards out of the containing cavity or backwards into the containing cavity through the forward and backward rotation of the handrails, so that the sliding and parking states of the scooter are finished, and the operation is simple and convenient; the front wheel forms a larger torque relative to the rotation center of the rotation seat due to the gravity of the front wheel and the gravity of the passenger in the advancing process, so that the situation that the front wheel rotates backwards due to the forward acting force applied to the handrail by the passenger in the sliding process and the scooter stops suddenly is prevented, safety accidents are avoided, and the safety is good.

The scooter still has the defect: in general, a user is sitting on a seat of the mountain tackle, but some users have fewer brakes and keep higher driving speed when using the mountain tackle for entertainment, and the power of the mountain tackle depends on a slope mountain and self gravity, for example, if the road surface of the mountain is uneven due to potholes or riprap and the like, the mountain tackle bumps, the gravity center is higher due to normal sitting posture of the user, and accidents such as overturning are easy to occur; if the user adopts measures such as body backward tilting to reduce the whole gravity center, the arm needs to be raised to hold the handle bar, so that the operation difficulty is improved, and accidents are easily caused due to poor operability; furthermore, prior art's mountain road coaster does not have fixed constraint function to user's foot, and the user is not good in the support sense of shank and foot when driving the mountain road coaster, has reduced user experience on the one hand, and on the other hand because the comfort level is not good produces the sense of security disappearance easily to easy mentally nervous when driving also can increase the probability of taking place the accident.

Disclosure of Invention

The invention aims to provide an adjustable mountain pulley, which can adjust the transverse height and the front and back positions of a seat, so that the gravity center can not move backwards greatly when a user leans backwards to lower the gravity center.

The invention is realized by the following technical scheme.

An adjustable mountain sled comprising:

a vehicle body;

the front end mechanism comprises a mounting seat arranged at the bottom of the front side of the vehicle body, a bogie which is arranged on the mounting seat in a left-right rotating manner, front wheels arranged at the bottom end of the bogie, and a handlebar which is arranged at the top end of the bogie in a left-right symmetrical manner and is of a nonlinear structure, wherein the top end of the bogie is provided with a locking structure for locking the handlebar on the bogie, and the handlebar is provided with a control structure for releasing the locking structure and allowing the handlebar to turn back and forth;

a seat mechanism including a rail frame extending in the front-rear direction and fixed to the rear side in the vehicle body, a seat slidably mounted on the rail frame;

and the rear wheel assembly is arranged at the bottom of the rear side of the vehicle body.

As a further improvement of the present invention, the locking structure includes a clasping ring disposed at the top end of the bogie and sleeved on the middle portion of the handlebar, the clasping ring has a notch, and a first protrusion and a second protrusion are respectively disposed at two ends of the notch, and a tightening member having a tendency of pulling the first protrusion and the second protrusion toward each other is connected between the first protrusion and the second protrusion.

As a further improvement of the present invention, the tension member includes a tension rod penetrating through the first and second protrusions, a pressing block fixed to a first end of the tension rod and abutting against the first protrusion, and a compression spring sleeved between a second end of the tension rod and the second protrusion and always in a compressed state.

As a further improvement of the invention, the control structure comprises a brake lever arranged at one end of the lever beam, an articulated rod with two ends respectively articulated at the top of the bogie and the second end of the tensioning rod and capable of being turned back and forth, a sleeve fixed at the second bulge, a brake cable penetrating through the sleeve and with two ends respectively connected with the brake lever and the articulated rod articulated at the second end of the tensioning rod.

As a further improvement of the invention, the seat comprises a seat part, a sliding part fixed at the bottom of the seat part and matched with the guide rail frame in a sliding way, a backrest frame hinged at the rear side of the seat part and capable of being turned back and forth, and a backrest part arranged on the backrest frame and capable of sliding along the backrest frame, wherein a backrest shaft extending in the left-right direction is arranged on the back surface of the backrest part, and the left end and the right end of the backrest shaft are respectively movably connected with the rear ends of the two side edges of the vehicle body.

As a further improvement of the present invention, a boss is disposed in the middle of the front side of the vehicle body, two leg accommodating spaces are enclosed by the front end of the vehicle body, the boss and the seat, a pedal fixing frame is fixed at a position corresponding to the front end of the leg accommodating space on two side edges of the vehicle body, and pedals are respectively disposed on portions corresponding to the front end of the leg accommodating space on the left and right sides of the pedal fixing frame.

As a further improvement of the invention, the footboard is provided with a binding belt for binding the foot to the footboard.

As a further improvement of the invention, the pedal fixing frame is of a rod-shaped structure, the middle part of the pedal fixing frame is fixedly connected with a pedal fixing seat, the pedal fixing seat is provided with pedal fixing shafts which are parallel to the pedal fixing frame and are bilaterally symmetrical, the pedal fixing shafts are positioned above the front side of the pedal fixing frame, and the pedal plate is hinged on the pedal fixing shafts and can turn back and forth.

The invention has the beneficial effects that:

the invention can adjust the overall height of the handle bar to adapt to the self-backward-bending degree before departure through the locking structure and the control structure, and in addition, because the control structure and the locking structure are very simple, the adjustment can be carried out in the process of driving a mountain pulley, the use flexibility is improved, a user can move the seat forwards while bending backwards, the phenomenon that the gravity center is greatly deviated backwards is avoided, the phenomenon that the front wheel slips due to the fact that the front part of the vehicle body is upwards lifted is avoided, the safety is improved, and the invention is particularly suitable for users with large weight or high height.

Drawings

The preferred embodiments of the present invention will hereinafter be described in detail to facilitate understanding of the objects and advantages of the invention, with reference to the accompanying drawings, in which:

FIG. 1 is a plan view of a vehicle body according to embodiment 1;

fig. 2 is a side view of the headstock mechanism of embodiment 1;

FIG. 3 is a schematic diagram of the locking structure and the control structure of embodiment 1;

FIG. 4 is a first schematic structural view of a support structure according to embodiment 1;

FIG. 5 is a second schematic structural view of the supporting structure of embodiment 1;

fig. 6 is a top view of the embodiment 2 ride;

fig. 7 is a front view of the embodiment 2 ride;

FIG. 8 is a cross-sectional view of the seat of embodiment 2;

FIG. 9 is a plan view of a front portion of a vehicle body in embodiment 2;

FIG. 10 is a schematic view showing a rotation structure of the foot pedal according to embodiment 2;

fig. 11 is a front view of the foot pedal of embodiment 2.

Detailed Description

The invention is explained in more detail below with reference to the drawings and exemplary embodiments.

The terms of orientation of up, down, left, right, front, back, top, bottom, and the like as referred to or as may be referred to in this specification are defined with respect to the configuration shown in the drawings, and the terms "inner" and "outer" refer to directions toward and away from the geometric center of a particular component and are relative terms, and thus may be changed accordingly depending on the position and the state of use of the particular component. Therefore, these and other directional terms should not be construed as limiting terms.

Example 1:

referring to fig. 1-5, a mountain tackle comprises a body 1, a head mechanism and a rear wheel assembly, wherein a seat 1-a is arranged at the rear side of the body 1, the head mechanism comprises an installation seat 21 arranged at the bottom of the front side of the body 1, a bogie 22 arranged on the installation seat 21 in a left-right rotating mode, a front wheel 23 arranged at the bottom end of the bogie 22, and a handle bar 24 which is arranged at the top end of the bogie 22 in a left-right symmetrical mode and is of a nonlinear structure, the top end of the bogie 22 is provided with a locking structure 3 for locking the handle bar 24 to the bogie 22, and the handle bar 24 is provided with a control structure for releasing the locking structure and allowing the handle bar 24 to turn back and forth. The rear wheel assembly is arranged at the bottom of the rear side of the vehicle body 1 and comprises a rear wheel and a rear axle assembly, and the specific structure refers to a scooter rear suspension device of the prior application CN201920952993.0 of the applicant and a scooter of CN201920953685. X.

Some users are when using the amusement of mountain area coaster, comparatively pay attention to the thrill, consequently the brake is used lessly when controlling the mountain area coaster, in order to keep the higher speed of going of mountain area coaster, this can have the potential safety hazard, because the power of mountain area coaster relies on the mountain area that has the slope, if do not brake the mountain area coaster just keep certain acceleration all the time and make speed faster and faster, if the road surface of mountain area has the pothole phenomenon, then can appear jolting phenomenon after the mountain area coaster passes through, if the user keeps higher position of sitting then the whole focus of user and mountain area coaster to be on a high side, then the accident of overturning appears easily.

In this embodiment, the handle bar 24 is of a U-shaped structure, and generally, the left and right ends of the handle bar 24 are set to have a height higher than that of the user's arm when the user is sitting on the seat 1-a, so as to match the lifting height of the user's arm when the user is sitting on the seat 1-a, and for the user pursuing the excitement, the user needs to lean back to lower the height of the center of gravity, and the lifting height of the user's handle is also lowered accordingly, so that the user can release the locking state of the handle bar 24 by the locking structure through the control structure, and then turn the handle bar 24 backwards to lower the height of the two ends of the handle bar 24, thereby ensuring that the overall height of the center of gravity of the user and the mountain sled is lower, and simultaneously ensuring that the user maintains a normal operation posture to reduce the operation difficulty and control the user to be more comfortable.

If the user controls the mountain pulley with the posture of just sitting when starting, along with driving the mountain pulley and going along the mountain road, it is more prudent to the control of speed at first, and some users are because the driving experience feels promotes gradually, in order to pursue better thrill, control to speed is looser and looser more for the posture of just sitting appears the potential safety hazard, considers this factor, can also adjust the height of violently 24 when driving the in-process and need not influence driving and control.

In this embodiment, the locking structure includes a clasping ring 31 sleeved on the middle of the handle bar 24, a locking connecting member 32 fixedly connected to the top end of the bogie 22 and the clasping ring 31, the clasping ring 31 has a notch and a first protrusion 33 and a second protrusion 34 respectively arranged at two ends of the notch, a tension member having a tendency to pull up is connected between the first protrusion 33 and the second protrusion 34, the tension member includes a tension rod 35 penetrating through the first protrusion 33 and the second protrusion 34, a pressing block 36 fixed at a first end of the tension rod 35 and abutting against the first protrusion 33, and a compression spring 37 sleeved between a second end of the tension rod 35 and the second protrusion 34 and always in a compressed state. Under normal conditions, due to the elastic force of the compression spring 37, the tightening rod 35 presses the pressing block 36 against the first protrusion 33, i.e. the clasp 31 is in interference fit with the handle bar 24, so that the handle bar 24 is in a locked state and cannot be turned back and forth.

The control structure comprises a brake lever 41 arranged at one end of the lever cross 24, a hinge rod 42 with two ends respectively hinged at the second ends of the locking connecting piece 32 and the tension rod 35 and capable of being turned back and forth, a sleeve 43 fixed at the second bulge 34, and a brake cable 44 passing through the sleeve 43 and with two ends respectively connected with the brake lever 41 and the hinge rod 42 and hinged at the second end of the tension rod 35. If a user needs to turn the handle bar 24 backwards to reduce the height of the two ends of the handle bar 24 in the driving process, the user only needs to grip the brake lever 41 to pull the brake cable 44, and under the pulling of the brake cable 44, the hinge rod 42 is connected to one end of the locking connecting piece 32 and turns forwards as a rotation center, so as to drive the second end of the tension rod 35 and push the tension rod 35 to slide upwards, and the pressing block 36 is separated from the first protruding part 33, so that the fit relationship between the clasping ring 31 and the handle bar 24 is changed from interference fit to sliding fit. Therefore, the user only needs to hold the brake lever 41 tightly to turn the handlebar 24 backwards through two arms, and after the adjustment is completed, the user releases the brake lever 41, so that the fit relationship between the clasping ring 31 and the handlebar 24 is changed into interference fit.

Bogie 22 includes steering spindle 221, the support body of fixing on steering spindle 221 top that can the left and right sides rotation, the support body includes bilateral symmetry and two vertical connecting rods 222 that set up, controls both ends respectively fixed connection at the last mounting panel 223 of two connecting rods 222, controls both ends respectively fixed connection at the lower mounting panel 224 of two connecting rods 222, the bottom of two connecting rods 222 with steering spindle 221 fixed connection, locking mechanical system and the equal fixed connection of supporting mechanism is in the top surface of going up mounting panel 223, go up mounting panel 223 with fixedly connected with stiffener 225 between lower mounting panel 224. Two connecting rod 222 and stiffener 225 have strengthened the vertical structural strength of support body, go up mounting panel 223 down mounting panel 224 has increased the horizontal structural strength of support body, and both combine together and can improve the overall structure intensity of support body, in addition first mounting panel provide the support body with enough installation space between violently 24, locking structure fixes the top surface of going up mounting panel 223.

The supporting structures 4 which are used for supporting the cross bar 24 and do not limit the forward and backward turning of the cross bar 24 are respectively arranged on the two sides of the locking structure on the top surface of the upper mounting plate 223, and the two bilaterally symmetrical supporting structures can support the cross bar 24, so that the situation that the two sides of the cross bar 24 are rocked after the locking structure is unlocked can be avoided, and the balance of the cross bar 24 in the adjusting process is improved.

The supporting structure comprises a first ferrule 51 sleeved on the handlebar 24 and a supporting connecting piece 52 fixedly connected with the mounting top surface and the first ferrule 51 respectively, a second ferrule 53 is arranged on the inner ring surface of the first ferrule 51, and a third ferrule 54 is sleeved on the part of the handlebar 24 positioned in the ferrule. The first ferrule 51 and the second ferrule 53 are sleeved outside the whole of the bar 24 and the third ferrule 54 as a whole, so that a good supporting effect is achieved, and the problem of axial deviation of the bar 24 in the adjusting process can be avoided. In addition, the ring surfaces of the second sleeve 53 and the third sleeve 54 which are contacted with each other are respectively provided with sawtooth structures which are meshed with each other and are made of elastic materials, so when a user releases the locking state of the handle bar 24 and does not rotate the handle bar 24, the handle bar 24 does not automatically turn due to the fact that the gravity center of the handle bar 24 deviates, the user can turn the handle bar 24 only by using a certain force, in addition, when the third sleeve 54 rotates by a tooth pitch relative to the second sleeve 53, the handle bar 24 is adjusted by a unit angle, the user can control the turning amplitude through hand feeling, the turning angle is prevented from being too large or being adjusted ceaselessly, the time for adjusting the handle bar 24 is shortened, and the safety is improved.

The two side surfaces of the first ferrule 51 are respectively fixed with a limiting disc 55, the limiting discs 55 are provided with through holes 13-A allowing the cross beam 24 to pass through and are used for blocking the third ferrule 54 from moving out of the first ferrule 51, and the problems of left and right transverse movement and symmetry damage after the cross beam 24 is unlocked can be avoided by arranging the limiting discs 55.

The bottom of the front side of the vehicle body is provided with a containing cavity provided with the mounting seat, an upward convex boss 11 is arranged above the containing cavity corresponding to the vehicle body 1, the mounting seat 21 can be turned back and forth relative to the vehicle body 1, the boss 11 is provided with a sliding part 13 which can slide along a mounting groove 12 and is fixed with the boss 11, two sides of the bottom of the vehicle body 1 in front of a front wheel 23 are respectively provided with a supporting block, and the sliding part 13 is provided with a through hole 13-A which allows the bogie 22 to pass through and has a gap with the bogie 22 at the front and the back. The structure and function of the mounting seat 21, the containing cavity and the supporting block refer to the applicant's prior application cn201920953685. The sliding part 13 slides along the mounting groove 12 when the front wheel 23 and the bogie 22 support the mountain tackle on the ground, the sliding part 13 is fixed by using a fastener, the bogie 22 is limited in the through hole 13-A of the sliding part 13 at the moment, the user can not turn the bogie 22 when adjusting the turning handle bar 24, and the driving stability and safety of the mountain tackle are improved.

Example 2:

referring to fig. 6 to 11, in addition to embodiment 1, the seat 1-a of embodiment 1 is replaced with a sitting mechanism, a rail frame 61 extending in the front-rear direction is fixed on the middle rear side of the vehicle body 1, the rail frame 61 is provided with a seat, the seat comprises a seat part 621, a sliding part 622 fixed on the bottom of the seat part 621 and matched with the rail frame 61 in a sliding manner, a backrest support rod 623 hinged on the rear side of the seat part 621 and capable of being turned back and forth, and a backrest part arranged on the backrest support rod 623 and capable of sliding along the backrest support rod 623, the back surface of the backrest part is provided with a backrest shaft 624 extending in the left-right direction, and the left and right ends of the backrest shaft 624 are respectively movably connected to the rear ends of the two side edges of the vehicle body 1.

The user still has a risk when overturning handle violently 24 and heeling back, if user's weight is overweight, then can make user and the whole center of mountain channel coaster too late when heeling back, therefore the mountain channel coaster front portion has the tendency of upwards lifting when going, thereby leads to the support dynamics on front wheel 23 and ground not enough, the phenomenon that front wheel 23 skids appears easily, the condition that the mountain channel coaster overturns backward can also appear even, therefore the user still needs to reduce the distance that the focus leaned back when heeling back and reducing the high as far as possible. In this embodiment, when the user leans backward, the backrest is tilted backward by the backward tilting action, so as to drive the backrest support bar 623 to be tilted backward, and at the same time, the backrest support bar 623 slides forward relative to the backrest, so as to push the seat 621 to slide forward, so that the center of gravity shifting backward due to the backward tilting of the upper body and the center of gravity shifting forward due to the forward tilting of the lower body occur synchronously, thereby counteracting each other to reduce the shift of the center of gravity.

The backrest portion comprises a backrest surface 625, a backrest frame 626 for fixing the backrest surface 625, and a slider 627 which is arranged on the backrest frame 626 and is in sliding fit with the backrest support rod 623, the backrest shaft 624 is fixedly connected to the backrest frame 626, a stable and firm fixing and supporting function can be provided through the sliding fit of the backrest frame 626 and the slider 627 with the backrest support rod 623, and the fixing of the backrest shaft 624 on the backrest frame 626 does not cause discomfort to the backrest surface 625.

The left and right sides of guide rail frame 61 has slide rail 611, the bottom both sides of seat portion 621 are fixed with respectively sliding part 622, sliding part 622 be provided with slide rail 611 complex movable pulley 622-1, two the bottom of sliding part 622 is less than the bottom surface of guide rail frame 61, and two be equipped with the connecting portion 631 of connecting both between the sliding part 622 bottom, guide rail frame 61 bottom surface is located the position in seat the place ahead is equipped with base 632, base 632 is fixed with the bottom shaft 633 that is on a parallel with guide rail frame 61, connecting portion 631 slides and passes bottom shaft 633, bottom shaft 633 covers has both ends to connect respectively connecting portion 631 and base 632's reset spring 634. When the user leans back, the seat 621 slides forward, i.e. the base 632 slides forward along the bottom shaft 633, at this time, the return spring 634 is compressed, and when the user does not need to lean back, the user only needs to lift the back to sit right, and under the action of the return spring 634, the seat 621 slides backward to the initial position, which is convenient to use.

In addition, the base 632 may be detachably mounted on the bottom surface of the rail bracket 61, and the mounting position may be adjusted along the length direction of the rail bracket 61, and a plurality of fixing points may be provided on the bottom surface of the rail bracket 61 in the front-rear direction. Therefore, the user can adjust the front and rear positions of the seat 621 by adjusting the position of the base 632 according to the riding habits of the user, thereby improving the user experience.

The front end of the vehicle body 1, the boss 11 and the seat enclose two leg accommodating spaces, a pedal fixing frame 71 is fixed at the position of two side edges of the vehicle body 1 corresponding to the front end of the leg accommodating space, foot pedals 72 are respectively arranged at the parts of the left side and the right side of the pedal fixing frame 71 corresponding to the front ends of the leg accommodating spaces 1-B, and the foot pedals 72 are provided with binding belts 73 for binding feet on the foot pedals 72. The user steps on the sole of the foot pedal 72 and fixes the foot and the foot pedal 72 together through the binding belt 73, so that the legs and the feet of the user can have better supporting feeling when the user rides on the mountain pulley, the comfort of the user is improved, and the driving tension can be reduced to a certain degree.

The pedal fixing frame 71 is a rod-shaped structure, a pedal fixing base 74 is fixedly connected to the middle of the pedal fixing frame 71, the pedal fixing base 74 is provided with pedal fixing shafts 75 which are parallel to the pedal fixing frame 71 and are symmetrical left and right, the pedal fixing shafts 75 are positioned above the front side of the pedal fixing frame 71, and the pedal plate 72 is hinged to the pedal fixing shafts 75 and can turn back and forth. The pedal 72 includes a pedal lower plate 721, a pedal upper plate 722, and a rotation structure connecting the two, the lower plate is hinged to the pedal fixing shaft 75, and the rotation structure enables the pedal upper plate 722 to rotate left and right relative to the pedal lower plate 721. The rotating structure comprises a disc member 723 and a ring member 724 which is sleeved on the peripheral edge of the disc member 723 and can rotate around the disc member 723, the ring member 724 is fixed in the middle of the upper surface of the pedal lower plate 721, a circular hole is formed in the middle of the pedal upper plate 722, and the ring member 724 is embedded and fixed in the circular hole of the pedal upper plate 722. The bottom surface of the pedal lower plate 721 is provided with a lantern ring 751, and the lantern ring 751 is sleeved on the pedal fixing shaft 75 and can rotate around the pedal fixing shaft 75 and slide along the length direction of the pedal fixing shaft 75.

The functions of forward and backward overturning, leftward and rightward translation and leftward and rightward overturning of the pedal plate 72 are realized, a user can adjust the stretching posture of the leg and the position of the foot according to own habits, and experience is improved, and the pedal fixing shaft 75 is provided with limiting pieces 752 on two sides of the lantern ring 751 respectively to prevent the lantern ring 751 from continuously sliding along the pedal fixing shaft 75. The stop 752 is provided to prevent the pedal 72 from translating excessively left and right, for example, the pedal 72 falls off the pedal fixing shaft 75, and the pedal 72 is too far inward to make the leg collide with the boss 11.

In addition, the upper surface of the pedal upper plate 722 is provided with a raised anti-slip layer 722-1 to avoid the slipping of the foot.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments can be modified, or some technical features can be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (7)

1. An adjustable mountain tackle, comprising:

a vehicle body;

the front end mechanism comprises a mounting seat arranged at the bottom of the front side of the vehicle body, a bogie which is arranged on the mounting seat in a left-right rotating manner, front wheels arranged at the bottom end of the bogie, and a handlebar which is arranged at the top end of the bogie in a left-right symmetrical manner and is of a nonlinear structure, wherein the top end of the bogie is provided with a locking structure for locking the handlebar on the bogie, and the handlebar is provided with a control structure for releasing the locking structure and allowing the handlebar to turn back and forth;

a seat mechanism including a rail frame extending in the front-rear direction and fixed to the rear side in the vehicle body, a seat slidably mounted on the rail frame; the seat comprises a seat part, a sliding part fixed at the bottom of the seat part and matched with the guide rail frame in a sliding manner, a backrest frame hinged at the rear side of the seat part and capable of being turned back and forth, and a backrest part arranged on the backrest frame and capable of sliding along the backrest frame, wherein a backrest shaft extending in the left-right direction is arranged on the back surface of the backrest part, and the left end and the right end of the backrest shaft are respectively movably connected to the rear ends of two side edges of the vehicle body;

and the rear wheel assembly is arranged at the bottom of the rear side of the vehicle body.

2. The adjustable coaster of claim 1, wherein the locking structure comprises a clasp disposed at a top end of the bogie and fitted over a middle portion of the handlebar, the clasp having a notch and a first protrusion and a second protrusion at opposite ends of the notch, respectively, and a tension member connected between the first protrusion and the second protrusion and tending to pull the first protrusion and the second protrusion closer to each other.

3. The adjustable coaster of claim 2, wherein the tension member comprises a tension rod extending through the first and second projections, a compression block secured to a first end of the tension rod and abutting the first projection, and a compression spring captured between a second end of the tension rod and the second projection and always in compression.

4. The adjustable coaster of claim 3, wherein the control structure comprises a brake lever at one end of the lever beam, a hinge rod hinged at both ends to the top of the bogie and the second end of the tension rod, respectively, and being reversible, a sleeve fixed to the second protrusion, and a brake cable passing through the sleeve and having both ends connected to the brake lever and the hinge rod, respectively, and hinged to the second end of the tension rod.

5. The adjustable mountain tackle as claimed in claim 1, wherein a boss is provided at a middle portion of a front side of the body, two leg receiving spaces are defined by a front end of the body, the boss and the seat, a foot fixing frame is fixed at a position corresponding to a front end of the leg receiving space at two sides of the body, and pedals are respectively provided at portions corresponding to front ends of the leg receiving spaces at two sides of the foot fixing frame.

6. The adjustable mountain sled of claim 5 wherein the foot pedals are provided with straps to restrain the foot to the foot pedals.

7. The adjustable mountain tackle as claimed in claim 5, wherein the pedal fixing bracket is a rod-like structure, a pedal fixing base is fixedly connected to a middle portion of the pedal fixing base, the pedal fixing base is provided with a pedal fixing shaft parallel to the pedal fixing bracket and symmetrical left and right, the pedal fixing shaft is located above a front side of the pedal fixing bracket, and the pedal plate is hinged to the pedal fixing shaft and can be turned back and forth.

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