阅读说明：本技术 一种人力三轮自行车 (Manpower tricycle ) 是由 何永红 于 2021-09-09 设计创作，主要内容包括：本发明为一种人力三轮自行车,包括车架、踏板机构、驱动机构、前轮和两后轮；踏板的两侧边通过前后臂分别与前支撑杆和驱动机构连接；驱动机构包括槽轮、后支撑杆和链条,链条的两端分别与后支撑杆和后臂的固定点固定连接,并缠绕在槽轮和小飞上。采用上述结构的三轮车,使用人可以行走较低台阶方式,以小幅移动形式实现连续驱动,大大地减少体力消耗；且使用者双腿不用张开很大,自由操控的空间大,利有于往复的蹬踏,不会影响使用者骑乘。由于驱动力由两个后轮交替提供,保证自行车稳定运行。同时,本申请通过设置滑块机构或复位弹簧,辅助踏板实现复位,降低了操作难度,并设计折叠机构以方便使用人携带和存放该三轮车。(The invention relates to a manpower tricycle, which comprises a frame, a pedal mechanism, a driving mechanism, a front wheel and two rear wheels; two side edges of the pedal are respectively connected with the front support rod and the driving mechanism through a front arm and a rear arm; the driving mechanism comprises a grooved wheel, a rear supporting rod and a chain, wherein two ends of the chain are respectively fixedly connected with the rear supporting rod and the fixed point of the rear arm, and are wound on the grooved wheel and the small fly. The tricycle adopting the structure can realize continuous driving in a small-amplitude moving mode by a user walking on lower steps, thereby greatly reducing physical consumption; and the legs of the user do not need to be opened greatly, the space for free operation is large, the reciprocating pedaling is facilitated, and the riding of the user is not influenced. The driving force is alternately provided by the two rear wheels, so that the stable running of the bicycle is ensured. Simultaneously, this application is through setting up slider mechanism or reset spring, and supplementary footboard realizes reseing, has reduced the operation degree of difficulty to design folding mechanism in order to make things convenient for the user to carry and deposit this tricycle.)

1. A manpower tricycle comprises a frame, a pedal mechanism, a driving mechanism, a front wheel (3) and two rear wheels (7) which rotate by driving a small flywheel (18); the frame is movably connected with two rear wheels (7) through a middle beam (4) and a rear axle (6); the method is characterized in that:

the middle beam (4) of the frame is provided with a front supporting rod (8);

the pedal mechanism is positioned on one side of the middle beam (4) and comprises a pedal (10) and a front arm (9) and a rear arm (11) which are respectively and movably connected with the two sides of the pedal (10); the other end of the front arm (9) is movably connected with the front supporting rod (8); the rear arm (11) is provided with a chain fixing point (19) fixedly connected with a first end of the chain (16);

the driving mechanism comprises a grooved pulley (12) connected with one end of the rear arm (11), a rear supporting rod (14) and a chain (16); the first end of the rear supporting rod (14) is movably connected with the rear arm (11), and the second end of the rear supporting rod is fixedly connected with the rear axle (6); the rear support rod (14) is provided with a rear arm chain connecting point (17) fixedly connected with the second end of the chain (16);

the chain (16) is wound around the sheave (12) and a small fly (18).

2. Manpower tricycle according to claim 1, characterized in that the sheaves (12), flyers (18), chain fixing points (19), trailing arm chain attachment points (17) are in the same vertical plane.

3. Manpower tricycle in accordance with claim 2 characterized in that the rear arm (11) is articulated to the rear stay (14) by means of a rear arm link (13).

4. Manpower tricycle according to claim 2, characterized in that the front arm (9) is movably connected with the front end of the pedal (10) near the side of the centre sill (4); the rear arm (11) is movably connected with one side, far away from the middle beam (4), of the rear end of the pedal (10).

5. Manpower tricycle according to claim 1 or 2 or 3 or 4, characterized in that the pedal mechanism and the driving mechanism are two sets of devices symmetrical to the centre sill (4); the front support rod (8) is provided with a slide block mechanism which comprises a hollow slide groove (22) and a slide block (23) capable of sliding in the slide groove (22); two ends of the sliding block (23) are respectively movably connected with the forearms (9) at the left side and the right side through a sliding block connecting rod (24); when the included angle of the forearms (9) on the left side and the right side is maximum, the sliding block (23) is positioned at the bottom end of the sliding groove (22).

6. Manpower tricycle in accordance with claim 1 characterized in that a return spring (21) is fixed between the rear arm (9) and the rear stay (14).

7. Manpower tricycle according to claim 1, characterized in that the rear stay (14) is provided with press wheels (26) for pressing the chain (16) wound around the small fly (18).

8. Manpower tricycle according to claim 1, characterized in that the centre sill (4) consists of an upper and a lower section sill, which are divided up and down; one end of the upper section beam is fixedly connected with the connecting piece (5), and one end of the lower section beam is fixedly connected with the rear axle (6); the upper section beam is movably connected with the lower section beam at a folding rotation point (27); the two sides of the folding rotation point (27) of the upper section beam and the lower section beam are respectively provided with a folding front fixing point (28) and a folding rear fixing point (29) which are detachably connected.

9. Manpower tricycle according to claim 1, characterized in that the forearm (9) is a thin steel rope or wire.

10. Manpower tricycle in accordance with claim 1 characterized in that the front end of the pedals (10) is provided with a pedal stop (20) higher than the pedal surface.

Technical Field

The invention relates to a vehicle, in particular to a manual tricycle.

Background

The statements in this section merely provide background information related to the present disclosure and may constitute prior art. In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art.

The traditional bicycle adopts circumferential pedaling motion, so that the transmission efficiency is low and the labor is wasted. And when the pedal is in a vertical position, a motion stop point is difficult to operate. When the sitting posture is adopted for use, the leg strength is completely used for driving, and particularly under the condition of using the leg strength for a long time, the legs are easy to be fatigued; when the bicycle is used in a standing position, the feet do circular motion along with the pedals of the bicycle, so that the action range of the body of a user is large, the physical strength of the user is greatly consumed, and the control difficulty of the bicycle is increased.

To solve the problems of the conventional bicycle, there is a bicycle that can be stepped up and down, which keeps the pedals at both sides of the bicycle in reciprocating motion by an internal mechanism. When the pedal on one side is stepped downwards, the pedal on the other side is reset to a high position, so that the gravity center position of an operator is transferred, the rotation of the large chain wheel is driven by the self gravity and the downward acting force of the operator, or the rotation of a small fly connected with the rear wheel is directly driven.

Under the name of CN201911129514.6, a "bicycle of the up-down pedaling type", when one pedal is stepped to the lowest point, the other pedal is reset to the highest point through a gear set, so as to be ready for the next side pedaling. However, the width and height difference between the two pedals are large, and when the pedals are pedaled on their sides, like the high steps, the single step is large in width and still requires much labor. And the pedal on the side without force application can be lifted to a larger height due to large single span, so that the action range of the body of an operator is large, the self balance is not easy to control during pedaling, and particularly, the condition of overturning is easy to occur due to poor balance degree of a two-wheeled bicycle.

The applicant has devised a manual bicycle (the name of the patent application No. 202021120346.2 entitled "a manual transportation means") which is easy to operate and saves labor by providing a large chain wheel and other transmission mechanisms and a pedaling mechanism near the center sill of the bicycle so that a rider can drive the bicycle to move forward only by pedaling with a small amplitude as the steps. However, in the actual sample manufacturing, most mechanisms are arranged near the center sill, so that the center sill is too bloated, the legs of a user are opened when the user straddles the center sill and rides on the center sill, the free operation space is small, the riding of the user is influenced, and the reciprocating pedaling is not facilitated.

Disclosure of Invention

In view of the above problems, it is an object of the present invention to solve some of the problems of the prior art, or at least to alleviate them.

A manpower tricycle comprises a frame, a pedal mechanism, a driving mechanism, a front wheel and two rear wheels which rotate by driving a small flywheel; the frame is movably connected with the two rear wheels through a middle beam and a rear axle;

the middle beam of the frame is provided with a front supporting rod;

the pedal mechanism is positioned on one side of the middle beam and comprises a pedal, a front arm and a rear arm which are respectively and movably connected with the two sides of the pedal; the other end of the front arm is movably connected with the front supporting rod; the rear arm is provided with a chain fixing point fixedly connected with the first end of the chain;

the driving mechanism comprises a grooved wheel connected with one end of the rear arm, a rear supporting rod and a chain; the first end of the rear supporting rod is movably connected with the rear arm, and the second end of the rear supporting rod is fixedly connected with the rear axle; the rear support rod is provided with a rear arm chain connecting point fixedly connected with the second end of the chain;

the chain is wound on the grooved pulley and the small fly.

Preferably, the grooved pulley, the small fly, the chain fixing point and the rear arm chain connecting point are positioned on the same vertical plane.

Furthermore, the rear arm is movably connected with the rear support rod through a rear arm connecting rod.

Furthermore, the front arm is movably connected with one side, close to the middle beam, of the front end of the pedal; the rear arm is movably connected with one side, far away from the middle beam, of the rear end of the pedal.

The pedal mechanism and the driving mechanism are two sets of devices which are symmetrical by the middle beam; the front support rod is provided with a slide block mechanism which comprises a hollow chute and a slide block capable of sliding in the chute; two ends of the sliding block are respectively movably connected with the forearms on the left side and the right side through sliding block connecting rods; when the forearm contained angle on left and right sides is the biggest, the slider is located the bottom of spout.

Furthermore, a return spring is fixedly arranged between the rear arm and the rear support rod.

Furthermore, the rear supporting rod is provided with a pressing wheel for pressing the chain wound on the small flyer.

The middle beam consists of an upper section beam and a lower section beam which are separated from each other up and down; one end of the upper section beam is fixedly connected with the connecting piece, and one end of the lower section beam is fixedly connected with the rear axle; the upper section beam is movably connected with the lower section beam at a folding rotating point; the upper section beam and the lower section beam are respectively provided with a folding front fixing point and a folding rear fixing point which are detachably connected at two sides of the folding rotation point.

The forearm is a thin steel rope or a steel wire.

The front end of the pedal is provided with a pedal blocking edge higher than the surface of the pedal.

The invention has the following beneficial effects:

1. the tricycle adopting the driving mechanism can realize continuous driving in a small-amplitude moving mode by a user walking on lower steps, so that the physical consumption is greatly reduced; the front arm and the rear arm are respectively arranged on two sides of the pedal, so that the driving mechanism connected with the rear arm is far away from the middle beam and is closer to the rear wheel, the mechanisms near the middle beam are small and cannot be overstaffed, the legs of a user do not need to be opened greatly when the user straddles the middle beam, the free control space is large, reciprocating pedaling is facilitated, and riding of the user is not influenced;

2. the driving force of the bicycle during advancing is alternately provided by the two rear wheels, and the two rear wheels can generate a differential effect during steering, so that the stable running of the bicycle is ensured, and the instability caused by the synchronous rotating speed of the rear wheels of the existing tricycle is avoided; the user does not need to specially practice to control balance, the popularization is easy, and the use is safer and more convenient;

3. the driving mechanism is an independent driving mechanism and can be arranged on a rear wheel and a small fly at one side, and even the disabled can operate conveniently; the forearms rotate around the movable connection points of the front supporting rods, so that the pedals can be ensured to be in a state suitable for a person to keep standing balance;

4. the front supporting rod is provided with the sliding block mechanism, so that the pedals on the left side and the right side realize the mutual resetting function, and the reciprocating motion of the tricycle is ensured; the pedal can be cooperated with a driving mechanism to limit the pedal to move between a position to be driven and a full driving position, so that the problem of misoperation caused by overlarge movement due to improper operation of a user is avoided;

5. the middle beam is designed into a folding mechanism form, so that the manual tricycle is convenient to drag when not in use, and the purpose of convenient carrying or storage is achieved.

Drawings

The above-described structure of the invention can be further illustrated by the non-limiting examples given in the following figures.

FIG. 1 is a partial schematic view of the pedal mechanism and drive mechanism of the present invention;

FIG. 2 is a schematic view of the pedal in a ready to drive position;

FIG. 3 is a schematic view of the pedal in a fully actuated position;

FIG. 4 is a schematic view of a spring-loaded drive mechanism with pedals in a ready-to-drive position;

FIG. 5 is a schematic view of the drive mechanism with the pedal in a fully driven position provided with a spring;

FIG. 6 is a partial schematic view of a slider mechanism;

FIG. 7 is a top view of the present invention;

FIG. 8 is a schematic view of the left and right pedals at their maximum included angles;

FIG. 9 is a schematic view of the left and right pedals at a minimum included angle;

FIG. 10 is a schematic view of a manual tricycle equipped with a pressure wheel;

FIG. 11 is a schematic view of the manual tricycle when unfolded;

fig. 12 is a schematic view of the manual tricycle when folded.

Wherein: 1-a steering arm; 2-a handlebar; 3-front wheels; 4-a centre sill; 5-a connector; 6-rear axle; 7-rear wheel; 8-a front support bar; 9-forearm; 10 pedals; 11-a rear arm; 12-a sheave; 13-a rear arm link; 14-rear support bar; 15-rear arm rotation point; 16-a chain; 17-rear arm chain attachment point; 18-little fly; 19-chain fixing point; 20-pedal blocking edge; 21-a return spring; 22-a chute; 23-a slide block; 24-a slider link; 25-slider link forearm attachment point; 26-a pressure wheel; 27-folding rotation point; 28-fixation point before folding; 29-folding fixed point; 30-left pedal; 31-right side pedal.

Detailed Description

The present invention will be further described with reference to the accompanying drawings, wherein the embodiments of the present invention are provided for illustrative purpose only and not for limiting the invention, and various alternatives and modifications can be made without departing from the technical spirit of the invention, according to the common technical knowledge and conventional means in the art.

As shown in fig. 1, 2 or 3, a manual tricycle includes a frame, a pedal mechanism, a driving mechanism, a front wheel 3 and two rear wheels 7 rotated by driving a flyer 18; the frame is movably connected with two rear wheels 7 through a middle beam 4 and a rear axle 6; the method is characterized in that:

the middle beam 4 of the frame is provided with a front supporting rod 8;

the pedal mechanism is positioned on one side of the middle beam 4 and comprises a pedal 10 and a front arm 9 and a rear arm 11 which are respectively and movably connected with the two sides of the pedal 10; the other end of the front arm 9 is movably connected with the front supporting rod 8; the rear arm 11 is provided with a chain fixing point 19 fixedly connected with a first end of the chain 16;

a driving mechanism which comprises a sheave 12 connected with one end of a rear arm 11, a rear supporting rod 14 and a chain 16; the first end of the rear supporting rod 14 is movably connected with the rear arm 11, and the second end of the rear supporting rod is fixedly connected with the rear axle 6; the rear support rod 14 is provided with a rear arm chain connecting point 17 fixedly connected with the second end of the chain 16;

the chain 16 is wound around the sheave 12 and a small fly 18.

The tricycle is provided with a front wheel 3 provided with a steering arm 1 and a handlebar 2, and is movably connected with the steering arm 1 through a connecting piece 5 at one end of a middle beam 4, and the other end of the middle beam 4 is fixedly connected with the middle part of a rear axle 6. Two ends of the rear axle 6 are respectively movably connected with a rear wheel 7. The drive mechanism is an independent drive mechanism, can be provided on the rear wheel 7 and the small flywheel 18 on one side, and can be operated by one leg even by a disabled person as shown in fig. 1. Of course, it is also possible to provide the rear wheels 7 on both sides with a drive mechanism, as shown in fig. 6 or 7.

The entire one-sided pedal mechanism and drive mechanism is supported by a front support bar 8 fastened to the centre sill 4 and a rear support bar 14 fastened to the rear axle 6. The movable connection point of the rear support rod 14 and the rear arm 11 is called a rear arm rotation point 15, and through the back and forth movement of the pedal 10, the sheave 12 on the rear arm 11 and the rear arm 11 can be driven to rotate around the rear arm rotation point 15, so as to drive the chain 16 wound on the sheave 12 and the small flywheel 18 to move, and finally, the rear wheel 7 is driven to advance through the rotation of the small flywheel 18.

As shown in FIG. 1, one end of the front arm 9 can be movably connected with the spindle of the front support rod 8, and the other end is connected with the pedal 10 at the inner side close to the middle beam 4. One end of the rear arm 11 is connected with the grooved wheel 12 through a mandrel, and the other end is connected with the outer side, far away from the center sill 4, of the pedal 10. Thus, the pedals 10 are supported by the front arms 9 and the rear arms 11 so that the user can stand thereon to operate. Of course, a seat cushion may be provided at the top end of the front support bar 8. Because the front and rear arms are respectively arranged at two sides of the pedal 10, the driving mechanism connected with the rear arm 11 is far away from the middle beam 4 and is closer to the rear wheel 7, so that the mechanism near the middle beam 4 is small and cannot be overstaffed, the legs of a user do not need to be opened greatly, the free control space is large, the reciprocating pedaling is facilitated, and the riding of the user cannot be influenced.

The pedal 10 of the present application is reciprocally operated between a to-be-driven position and a fully-driven position. When the pedal 10 is in the belt drive position, as shown in fig. 2, no work is applied to the small fly. When a user holds the handlebar 2 with both hands to transfer the body weight to the pedal 10, as shown in fig. 1 or 3, gravity moves the pedal 10 backward, and the user in a standing posture can apply backward thrust to the pedal 10 by means of the handlebar 2 to drive the rear arm 11 of the driving mechanism and the sheave 12 on the rear arm to rotate around the rear arm rotation point 15 of the rear supporting rod 14, so that the chain 16 moves and correspondingly drives the small flywheel 18 mounted on the rear wheel 7 and the rear wheel 7 to rotate forward around the movable connection point of the rear axle 6, thereby driving the rear wheel 6 to advance. Meanwhile, the forearms 9 rotate around the movable connection points of the front supporting rods 8, so that the pedal can be ensured to be in a state suitable for a person to keep standing balance.

When the pedals 10 are in the fully driven position, as shown in fig. 1 or 3, if the weight of the human body is transferred to another pedal 10, or only a small forward force is applied to the foot that does not bear the weight of the human body, the rotation of the driving mechanism causes the rear arm 11, the sheave 12 and the chain 16 to accumulate a certain potential energy of the rotational motion, and the driving mechanism performs the rotational motion to drive the pedal 10 and the corresponding front arm 9 and rear arm 11 to return to the non-driven position, in preparation for the second pedaling. Meanwhile, after the pedal 10 is pedaled to move backwards, the gravity of the human body is transferred to the pedal 10 on the other side, and the human body can automatically return to the position to be driven, so that the gravity balance is ensured, and the reciprocating motion is realized. Therefore, the user can walk on lower steps and realize continuous driving in a small-amplitude moving mode.

The grooved wheel 12, the small fly 18, the chain fixing point 19 and the rear arm chain connecting point 17 are positioned on the same vertical plane, as shown in fig. 1 or 7, the chain 16 can be ensured to be positioned on the same vertical plane, the work is not easy to be increased due to the obstruction of the grooved wheel wall, the work loss is reduced, the work of the movable pedal 10 is converted into the driving force for the rear wheel 6 to the maximum extent, and the rear wheel 6 is driven to move forward.

Sheave 12 may be movably connected to the other end of rear arm 11 by an inwardly or outwardly extending spindle. Preferably, the sheave 12 is located between the rear arm 11 and the rear wheel 7, bringing the entire drive mechanism closer to the rear wheel 7, reducing the impact on user pedaling.

The rear arm 11 is movably connected with the rear support rod 14 through a rear arm connecting rod 13, as shown in fig. 1. One end of the rear arm connecting rod 13 is fixedly connected with the rear arm 11, and the other end is movably connected with the top end (inner side or outer side) of the rear supporting rod 14.

As shown in fig. 1, the front arm 9 is movably connected with one side of the front end of the pedal 10 close to the middle beam 4; the rear arm 11 is movably connected with one side of the rear end of the pedal 10 far away from the middle beam 4. With the above structure, the driving mechanism is closer to the middle beam 4 far away from the user, so that the free movement space of the user is larger, the operation of pedaling the pedal 10 is easier, and the pedal is more similar to a small-moving step mode, thereby facilitating the operation of the user.

The front end of the pedal 10 is provided with a pedal edge 20 higher than the surface of the pedal, as shown in fig. 2. The toe contact with the pedal edge 20 facilitates the application of a forward force to the pedal 10 to return the pedal 10, the front arm 9 and the rear arm 11 to the positions to be driven.

The front arm 9 is a thin steel rope or a steel wire, and the purposes of effectively reducing weight and improving the rotation effect can be achieved.

As shown in fig. 4 or 5, a return spring 21 is fixedly provided between the rear arm 9 and the rear stay 14. For example, when the drive mechanism is operated (i.e., the pedal 10 is moved to the fully driven position), the return spring 21 is elongated, as shown in FIG. 5; when the driving mechanism is finished (i.e. the pedal 10 moves to the position to be driven), as shown in fig. 4, the return spring 21 drives the driving mechanism to return, so as to realize the reciprocating motion. Of course, compression-release may be used.

The driving mechanism on one side can be an independent driving mechanism, and the driving mechanisms on two sides can be combined to generate a linkage effect so as to realize reciprocating motion. As shown in fig. 6, 7, 8 or 9, the pedal mechanism and the driving mechanism are two sets of devices which are symmetrical with the centre sill 4; the front support rod 8 is provided with a slide block mechanism which comprises a hollow slide groove 22 and a slide block 23 capable of sliding in the slide groove 22; two ends of the slide block 23 are respectively movably connected with the front arms 9 on the left side and the right side through slide block connecting rods 24; when the included angle of the forearms 9 on the left side and the right side is maximum, the sliding block 23 is positioned at the bottom end of the sliding groove 22.

The front support rod 8 is fixedly provided with a sliding chute 22 with a central line coinciding with the center line of the included angle between the two front arms 9, and the two slider connecting rods 24 have the same length, as shown in fig. 8, so that the left pedal 30 and the right pedal 31 are always in opposite moving directions in the horizontal direction and are symmetrical relative to the central line of the sliding chute 22. Initially, as shown in fig. 6 or 8, the left pedal 30 is in the fully actuated position, the right pedal 31 is in the ready-to-actuate position, the included angle between the left and right forearms 9 is the largest, and the slide block 23 is located at the bottom end of the slide slot 22. When the right pedal 31 is depressed backward to move the pedal 10 to the full drive position, the distance between the right forearm 9 and the slider 23 becomes smaller, so that the slider 23 is rotated about the slider link forearm connection point 25 by the right slider link 24 and moves upward under the restriction of the slide slot 22. At the same time, the slide block 23 moving upwards drives the front arm 9 and the left pedal 30 on the left side to move to the position to be driven through the slide block connecting rod 24 on the left side. When the left and right forearms 9 are both moved to coincide with the centerline of the chute 22, the slider 23 is at the highest point as shown in fig. 9. At this time, the right pedal 31 continues to move to the full drive position, the distance between the right front arm 9 and the slider 23 becomes large, the right front arm 9 pulls down the slider 23 through the slider link 24, and finally the slider 23 moves back to the lowest point (bottom end) of the chute 22 when the right pedal 31 moves to the full drive position. Similarly, the left forearm 9 is also driven by the downward moving slider 23 to continue to drive the left pedal 30 to move to the position to be driven, as shown in fig. 7, so as to reset the left pedal 30. The left pedal 30 is pedaled in the same manner. The slider mechanism enables the pedals 10 on the left and right sides to achieve the mutual resetting function, and ensures the reciprocating motion of the bicycle of the present application. And the slider 23 is located the bottom of spout 22 during the biggest contained angle of forearm 9 on left and right sides to also restrict both sides footboard 10 and remove beyond the position of treating the drive, avoid the user to operate improperly, lead to because of moving the misoperation problem that the step is too big and cause and take place.

The highest point of the sliding block 23 can be just the highest point of the sliding groove 22, and can also not rise to the highest point of the sliding groove 22, so that the influence of the groove height of the sliding groove 22 on the movement of the left and right front arms 9 is avoided. Preferably just to the highest point of the chute 22, and also prevents the pedal 10 from moving beyond the fully actuated position, resulting in damage to the sheave 12 of the drive mechanism by collision with components such as the flyer 18, or from an operator walking too far, resulting in operational errors.

The rear support bar 14 is provided with a pressing wheel 26 for pressing the chain 16 wound on the small fly 18, as shown in fig. 10, so as to improve the engagement degree of the chain 26 of the driving mechanism and the small fly 18 and ensure the transmission effect.

As shown in fig. 11 or 12, the center sill 4 is composed of an upper section sill and a lower section sill which are separated from each other; one end of the upper section beam is fixedly connected with a connecting piece 5, and one end of the lower section beam is fixedly connected with a rear axle 6; the upper section beam is movably connected with the lower section beam at a folding rotation point 27; the upper beam and the lower beam are respectively provided with a folding front fixing point 28 and a folding rear fixing point 29 which are detachably connected at two sides of the folding rotation point 27.

A connecting member to which the pre-folding fixing point 28 and the post-folding fixing point 29 can be detachably connected to each other. When the tricycle is used, the upper section beam and the lower section beam are fixedly connected at the fixing point 28 before being folded, as shown in fig. 11, so that the tricycle can be normally used; when the tricycle is not in use, the upper and lower beams are detached from the fixing points 28 before folding and folded around the folding rotation points 27. After the folding is completed, the folded fixing points 29 of the upper and lower beams are fixedly connected, as shown in fig. 12, and the folding of the tricycle is completed. Through the folding mechanism, the manual tricycle is convenient to drag when not in use, and the purpose of convenient carrying or storage is achieved.

The front wheel 3 and the handlebar can also be turned 90 degrees around the centre sill 4 by means of the connecting piece 5, so that the front wheel 3 and the steering mechanism are turned to the end close to the rear axle 6, and the occupied volume is smaller.

The fixed connection which is not specified can be a connection mode such as riveting, welding, bolt connection and the like, a movable connection can be a connection mode such as hinging and the like.