CN111572688A - Bicycle with a wheel - Google Patents

Abstract

The invention relates to the technical field of vehicles, and specifically discloses a bicycle, which comprises a front handlebar assembly, a rear handlebar assembly, a beam frame and a steering system. The front beam of the beam frame is rotatably connected with the rear beam, so that the bicycle can be in an unfolded state and a folded state. The bicycle in the folded state can greatly reduce its size in the length direction, making the bicycle easy to carry and store. In order to enable the child to control the steering of the bicycle and to exercise the child's control ability, the child sits on the front seat assembly to control the front handlebar assembly, the front handlebar assembly is connected with the front wheel, and the rotation of the front handlebar assembly can control the steering of the front wheel. In order to prevent children from being unable to avoid the danger accurately and in time, the front end of the steering system is connected to the front handlebar assembly, and the rear end of the steering system is connected to the rear handlebar assembly. An adult sitting on the rear seat assembly controls the front car through the rear handlebar assembly. Rotate the assembly, and then control the rotation of the front wheel to realize the steering of the bicycle.

Description

a bicycle

technical field

The present invention relates to the technical field of vehicles, in particular to a bicycle.

Background technique

With the improvement of people's living standards, more attention is paid to the company of children, and there are more activities such as outings with children. Bicycles for two-person use in the prior art generally control the direction by the front handlebar, and do not set the rear handlebar or fix the rear handlebar, and cannot be used to control the direction. Due to the poor ability of children to control bicycles and to predict dangers, if a child sits in the front seat and drives the front handlebar to rotate, there is a great safety hazard in controlling the steering of the front wheel. If an adult sits in the front seat to control the direction, and a child sits in the back seat, the adult cannot see the child in real time. When the child is in danger of falling, the adult cannot protect the child, and the child sitting in the back seat cannot exercise the child's control ability. In addition, due to the large size of the tandem bicycle, it is inconvenient to be carried to the suburbs, thereby affecting the use of the user.

Therefore, there is an urgent need for a bicycle with a high degree of safety and easy to carry.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a bicycle to improve the safety of the bicycle and make the bicycle easy to carry.

For this purpose, the present invention adopts the following technical solutions:

A bicycle, comprising: a front handlebar assembly, a front seat assembly, a rear handlebar assembly and a rear seat assembly arranged in sequence from front to back, further comprising:

A beam frame, the front handlebar assembly, the front seat assembly, the rear handlebar assembly and the rear seat assembly are respectively connected with the beam frame, the beam frame includes a front beam and a rear beam, and the front beam is connected to the beam frame. the rear beam is rotatably connected to enable the bicycle to be in an unfolded state and a folded state;

A steering system, the lower end of the front handlebar assembly is connected with a front wheel, the rotation of the front handlebar assembly can control the steering of the front wheel, the front end of the steering system is connected with the front handlebar assembly, the steering system The rear end is connected with the rear handlebar assembly so that the rear handlebar assembly can drive the front handlebar assembly to rotate.

Preferably, the steering system includes:

a front fixing block, connected with the front handlebar assembly;

a left control assembly, the front end of the left control assembly is connected with the front fixing block and located on the left side of the front handlebar assembly, and the rear end of the left control assembly is connected with the left handle of the rear handlebar assembly ;

a right control assembly, the front end of the right control assembly is connected with the front fixing block and located on the right side of the front handlebar assembly, and the rear end of the right control assembly is connected with the right handle of the rear handlebar assembly , the rear handlebar assembly drives the front handlebar assembly to rotate through the left control assembly and the right control assembly.

Preferably, the rear end of the rear beam is connected with a rear wheel set, and the rear wheel set includes:

Left wheel and right wheel are set at intervals along the left and right directions;

The rear axle sleeve is connected to the rear end of the rear beam, the rear axle sleeve is provided with a rear rotating shaft, and the left wheel and the right wheel are respectively connected to both ends of the rear rotating shaft.

Preferably, the rear seat assembly includes a rear seat support rod, and the rear seat support rod is rotatably arranged on the front beam forward and backward; the bicycle further includes:

a rear support frame, the rear end of the rear support frame is connected to the rear beam, the front end of the rear support frame is detachably connected to the rear seat support rod, the rear seat support rod, the rear beam and the The rear support frame forms a triangular structure.

Preferably, the rear seat support rod includes an upper support rod and a lower support rod that are rotatably connected, so that the rear seat support rod can be folded; the lower end of the lower support rod is rotatably connected to the front beam.

Preferably, the lower end of the rear handlebar assembly is rotatably connected to the front beam forward and backward; the bicycle further includes:

A limit rod, one end of the limit rod is fixedly connected to one of the rear handlebar assembly and the rear seat assembly, and the other end of the limit rod is connected to the rear handlebar assembly and the rear seat Another detachable connection in the assembly.

Preferably, the rear handlebar assembly includes:

a rear inner rod, the lower end of the rear inner rod is rotatably connected with the front beam;

The rear outer rod is sleeved outside the rear inner rod and can be rotated relative to the rear inner rod, the front seat assembly is connected with the rear outer rod, and the lower end of the front seat assembly is detachable from the front beam connect.

Preferably, the front seat assembly includes:

a front seat strut, the front seat strut is connected with the rear handlebar assembly;

A front channel steel, the lower end of the front seat support rod is connected with the front channel steel, and the front channel steel can be inserted into the front beam.

Preferably, the front handlebar assembly includes:

a front outer rod, the front end of the front beam is connected with the front outer rod;

The front inner rod includes an upper rotation rod and a lower rotation rod that are arranged up and down and are rotatably connected, and the upper rotation rod can be rotated to a deployment position coaxially arranged with the lower rotation rod, and can be rotated to the upper rotation rod. In the folded position where the rod is arranged at an angle, the lower rotation rod rotates and passes through the front outer rod, and the lower end of the lower rotation rod is connected with the front wheel.

Preferably, the bicycle further comprises a transmission system, the transmission system comprising:

The front sprocket and the middle sprocket set are respectively rotated and arranged on the beam frame along the front and rear directions;

a front chain, drivingly connected with the front sprocket and the intermediate sprocket set;

a rear sprocket, sleeved on the outside of the rear rotating shaft;

The rear chain is in driving connection with the intermediate sprocket set and the rear sprocket.

Beneficial effects of the present invention:

The front beam and the rear beam are rotatably connected, so that the bicycle can be in the unfolded state and the folded state. The bicycle in the folded state can greatly reduce its size in the length direction, so that the user can place the bicycle in the trunk of the car, so that the Bicycles are easy to carry. In order for the adult to be able to see the child's condition at all times, the child sits on the front seat assembly to control the front handlebar assembly, and the adult sits on the rear seat assembly to control the rear handlebar assembly. In order to enable the child to control the steering of the bicycle and to exercise the control ability of the child, the front handlebar assembly is connected with the front wheel, and the rotation of the front handlebar assembly can control the steering of the front wheel. In order to prevent children from being unable to avoid the danger accurately and in time, the front end of the steering system is connected to the front handlebar assembly, and the rear end of the steering system is connected to the rear handlebar assembly. An adult sitting on the rear seat assembly controls the front car through the rear handlebar assembly. Turn the assembly to realize the synchronous movement of the front handlebar assembly and the rear handlebar assembly, and then control the steering of the front wheel to realize the steering of the bicycle.

Description of drawings

1 is a schematic structural diagram of a bicycle provided in an embodiment of the present invention in an unfolded state;

2 is a schematic structural diagram of a bicycle provided in an embodiment of the present invention in a folded state;

3 is a partial structural schematic diagram of a bicycle provided in an embodiment of the present invention in a folded state;

FIG. 4 is a schematic structural diagram of the bicycle in FIG. 3 from another perspective;

5 is a partial structural schematic diagram of a bicycle provided in an embodiment of the present invention in an unfolded state;

FIG. 6 is a schematic structural diagram of a steering system of a bicycle provided by an embodiment of the present invention.

In the picture:

1. Front handlebar assembly; 11. Front outer rod; 12. Front inner rod; 121. Upper turning rod; 122. Lower turning rod;

2. Front seat assembly; 21. Front seat support rod; 22. Front channel steel;

3. Rear handlebar assembly; 31. Rear inner lever; 32. Rear outer lever; 33. Rear steering lever; 34. Rear handlebar body;

4. Rear seat assembly; 41, Rear seat support rod; 411, Upper support rod; 412, Lower support rod;

5. Beam frame; 51. Front beam; 52. Back beam;

6. Steering system;

61, front fixing block; 611, ferrule; 612, left plug block; 613, right plug block;

62, left control assembly; 621, left spring; 622, left cable; 623, left sleeve;

63, right control assembly; 631, right spring; 632, right cable; 633, right sleeve;

64. Abutment block;

7. Rear wheel set; 71, Left wheel; 72, Right wheel; 73, Rear axle sleeve; 74, Rear shaft;

8. Front wheel;

9. Transmission system; 91. Front sprocket; 92. Intermediate sprocket set; 93. Front chain; 94. Rear sprocket; 95. Rear chain;

10. Limit bar;

20, front support frame; 201, inclined bar; 202, cross bar;

30, rear support frame; 301, rear support frame body; 302, rear channel steel;

40. Mounting frame.

Detailed ways

The technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the accompanying drawings only show some but not all of the parts related to the present invention.

Some orientation words are defined in the present invention. Unless otherwise stated, the orientation words used are "up", "down", "left", "right", "inner", "outer", these orientations The words are used for ease of understanding, and thus do not limit the protection scope of the present invention.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features Not directly but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of the present invention, unless otherwise expressly specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

This embodiment provides a bicycle, which can be used when adults and children are out in the field, but is not limited to this, and can also be used in other occasions to improve its safety and portability.

As shown in FIG. 1 and FIG. 2 , the bicycle provided in this embodiment includes a front handlebar assembly 1 , a front seat assembly 2 , a rear handlebar assembly 3 and a rear seat assembly 4 arranged in sequence from front to rear, and also includes a beam frame 5 and a rear seat assembly 4 . In the steering system 6 , the front handlebar assembly 1 , the front seat assembly 2 , the rear handlebar assembly 3 and the rear seat assembly 4 are respectively connected with the beam frame 5 .

The beam frame 5 includes a front beam 51 and a rear beam 52 . Preferably, the front handlebar assembly 1 is connected to the front end of the front beam 51 , and the rear end of the rear beam 52 is connected to the rear wheel set 7 . The front beam 51 and the rear beam 52 are rotatably connected, so that the bicycle can be in an unfolded state and a folded state. The bicycle in the folded state can greatly reduce its size in the length direction, so that the user can place the bicycle in the trunk of the car. Preferably, the rear beam 52 is arranged substantially horizontally when the bicycle is in the unfolded state. When the bicycle enters the folded state from the unfolded state, the rear beam 52 rotates downward and forward around the horizontal axis. In this embodiment, the rear beam 52 is connected to the rear beam. The rear wheel set 7 of 52 can be rotated about 150°-170°, so that the size of the bicycle in the folded state does not increase in the height direction. Of course, it can be understood that the rotation angle of the rear beam 52 is not limited to this, as long as the rear beam 52 and the rear wheel set 7 do not interfere with other components such as the front beam 51, the rear beam 52 can be rotated arbitrarily within a range of 180°. Of course, in other embodiments, when the bicycle enters the folded state from the unfolded state, the rear beam 52 rotates leftward, forward or rightward and forward around the vertical axis, or the rear beam 52 rotates upward and forward around the horizontal axis. It can be understood that the left-right direction is the left-right direction when the user rides the bicycle, or the left-right direction when the user faces the bicycle.

Preferably, the front beam 51 and the rear beam 52 are rotatably connected through an intermediate shaft. Further, the front beam 51 is provided with a central axis hole, the central axis hole is rotatably passed through the central axis hole, and both ends of the central axis hole protrude from the central axis hole. The rear beam 52 includes two beam plates arranged in parallel, and the two beam plates are respectively rotatably connected to both ends of the extending shaft hole of the intermediate shaft.

As shown in FIGS. 1 and 2 , the rear seat assembly 4 includes a rear seat support rod 41 , and the rear seat support rod 41 is disposed on the front beam 51 so as to be rotatable back and forth. Specifically, the rotation axis of the seat post 41 is parallel to the rotation axis of the rear beam 52, and the seat post 41 rotates forward and downward, thereby reducing the height of the bicycle. The rear seat assembly 4 may further include a rear seat connected to the upper end of the rear seat support rod 41 .

In order to improve the stability of the rear seat assembly 4 when the bicycle is in the unfolded state and avoid the rear seat assembly 4 from rotating backward and downward during riding, the bicycle further includes a rear support frame 30, and the rear end of the rear support frame 30 is connected to the rear seat assembly 4. The rear beam 52 , preferably, the rear end of the rear support frame 30 is connected to the rear beam 52 through the rear wheel set 7 . The front end of the rear support frame 30 is detachably connected with the rear seat support rod 41 , and the rear seat support rod 41 , the rear beam 52 and the rear support frame 30 form a triangular structure. Preferably, the rear seat support rod 41 is inclined rearwardly, that is, the rear seat support rod 41 is arranged at an acute angle with the rear beam 52 and the rear support frame 30, on the one hand, the stability of the rear seat support rod 41 can be improved, and on the other hand, it can also be Avoid the rotation of the 7 pieces of the rear wheel group and the rear beam 52 when the bicycle passes through the ditch.

As shown in FIGS. 1 and 2 , preferably, the rear support frame 30 includes a rear support frame body 301 and a rear channel steel 302 connected to the front end of the rear support frame body 301 , and the rear seat support rod 41 can be inserted into the rear channel steel 302 , so as to realize the detachable connection between the rear seat support rod 41 and the rear support frame 30 . Further, the rear channel steel 302 includes a bottom plate and two side plates connected to both ends of the bottom plate, the bottom plate and the two side plates are connected to form a U-shaped channel steel, and the rear seat support rod 41 is made of square steel. The contact area between the seat support rod 41 and the rear channel steel 302 is large, thereby improving the stability of their connection. Of course, in other embodiments, the rear seat support rod 41 can also be a circular tube. The adjustment and change of the specific structure of the rear seat support rod 41 do not deviate from the principle and scope of the present invention, and should be limited to the present invention. within the scope of protection.

As shown in FIG. 2 , preferably, the rear seat support rod 41 is rotatably connected to the front beam 51 through the mounting frame 40 . The mounting frame 40 includes a bottom plate and two ear plates respectively connected to the left and right ends of the bottom plate, and the bottom plate and the ear plates form a U-shape structure. The lower side of the bottom plate is connected to the front beam 51, and the two lugs are provided with shaft holes in the position facing each other, and the connecting shaft is penetrated through the two shaft holes and the rear seat support rod 41, so as to realize the rear seat support rod 41 and the front beam. Rotary connection of 51.

As shown in FIGS. 1 and 2 , preferably, the rear seat support rod 41 includes an upper support rod 411 and a lower support rod 412 , the lower end of the lower support rod 412 is rotatably connected with the front beam 51 , and the upper end of the upper support rod 411 is connected with the rear seat connect. The upper support rod 411 and the lower support rod 412 are rotatably connected, so that the rear seat support rod 41 can be folded, and the length of the folded rear seat support rod 41 is reduced, so as to avoid interference between the rear seat support rod 41 and the rear handlebar assembly 3 . In other embodiments, the rear seat support rod 41 may not be formed by connecting the upper support rod 411 and the lower support rod 412, but an integral structure. When the bicycle is folded, the rear seat support rod 41 is rotated forward and downward as a whole to achieve folding .

As shown in FIGS. 1 , 3 and 4 , preferably, the lower end of the rear handlebar assembly 3 is connected to the front beam 51 rotatably forward and backward. In this embodiment, the rear handlebar assembly 3 can be rotated around the horizontal axis. Rotation is also possible about a vertical axis, wherein the horizontal axis is parallel to the axis of rotation of the rear beam 52 .

As shown in FIG. 1 , in order to restrict the rotation of the rear handlebar assembly 3 of the bicycle in the unfolded state around the horizontal axis, the bicycle further includes a limit rod 10 , and the front end of the limit rod 10 is detachably connected to the rear handlebar assembly 3 . The rear end of the rod 10 is fixedly connected to the rear seat assembly 4 . When the bicycle is folded, the limit rod 10 is separated from the rear handlebar assembly 3, the restriction on the rear handlebar assembly 3 is cancelled, and the rear handlebar assembly 3 is rotated forward and downward around the horizontal axis, thereby reducing in the height direction the size of the bike.

Preferably, the limit rod 10 includes a limit rod body and a circular arc plate connected to the front end of the limit rod body, the circular arc plate has a circular arc groove, and the circular arc groove can be inserted into the front handlebar assembly 1 . Of course, in other embodiments, the front end of the limit rod 10 may also be fixedly connected to the rear handlebar assembly 3 , and the rear end of the limit rod 10 may be detachably connected to the rear seat assembly 4 .

As shown in FIG. 3 , preferably, the rear handlebar assembly 3 is rotatably connected to the front beam 51 through another mounting frame 40 , and the connecting shaft passes through the two shaft holes and the lower end of the rear handlebar assembly 3 , thereby realizing the rear handlebar The assembly 3 is connected in rotation with the front beam 51 .

As shown in FIGS. 1 and 3 , in this embodiment, the lower end of the front seat assembly 2 is detachably connected to the front beam 51 , and the rear handlebar assembly 3 and the front seat assembly 2 rotate integrally, thereby increasing the folding and opening speed of the bicycle. In order to avoid interference with the front beam 51 when the rear handlebar assembly 3 and the front seat assembly 2 are rotated forward and downward as a whole, the rear handlebar assembly 3 and the front seat assembly 2 are first rotated backward and downward around the horizontal axis, so that the front handlebar The assembly 1 is separated from the front beam 51, and then the rear handlebar assembly 3 is rotated left or right around the vertical axis, so that the front seat assembly 2 is located on the side of the front beam 51, and finally the rear handlebar assembly 3 and the front seat assembly 2 are wound around. The horizontal axis is rotated forward and downward about 180°, and the folding of the rear handlebar assembly 3 and the front seat assembly 2 can be completed. Preferably, in this embodiment, the rear handlebar assembly 3 is rotated 90° around the vertical axis. When the bicycle is in a folded state, the length direction of the rear handlebar body 34 of the rear handlebar assembly 3 is consistent with the vertical direction, so that Reduce the size of the bike in the left and right directions.

Preferably, in order to enable the rear handlebar assembly 3 to rotate around the vertical axis, the rear handlebar assembly 3 includes a rear inner rod 31 and a rear outer rod 32 , and the lower end of the rear inner rod 31 is rotatably connected with the front beam 51 . The lower end of the inner rod 31 is rotatably connected to the rear beam 52 through the mounting bracket 40 . The rear outer rod 32 is sleeved outside the rear inner rod 31 and can rotate relative to the rear inner rod 31. When the rear handlebar assembly 3 rotates around the vertical axis, the rear inner rod 31 does not rotate, and the rear outer rod 32 rotates around its own axis . Preferably, the front seat assembly 2 is connected with the rear outer rod 32, therefore, the front seat assembly 2 is driven to rotate when the rear outer rod 32 rotates.

Preferably, in order to ensure the stability of the front seat assembly 2 and the rear handlebar assembly 3, and to realize the connection between the front seat assembly 2 and the rear outer rod 32, the front seat assembly 2 is connected to the rear outer rod 32 through the front support frame 20, and the front support frame 20 It includes a cross bar 202 and a diagonal bar 201 , the front end of the cross bar 202 is connected with the front seat assembly 2 , and the rear end of the cross bar 202 is connected with the rear outer bar 32 of the rear handlebar assembly 3 . The upper end of the inclined rod 201 is connected with the rear end of the cross rod 202 and the rear outer rod 32, and the lower end of the inclined rod 201 is connected with the lower end of the front seat assembly 2. The front seat assembly 2, the inclined rod 201 and the cross rod 202 form a triangular structure, and the front beam 51 , the rear handlebar assembly 3 and the inclined rod 201 form a triangular structure.

Preferably, the front seat assembly 2 includes a front seat support rod 21 and a front channel steel 22, the front seat support rod 21 is connected with the rear handlebar assembly 3, the upper end of the front seat support rod 21 is connected with the front seat, and the lower end of the front seat support rod 21 is connected with the front channel steel 22. For connection, the front channel steel 22 can be inserted into the front beam 51 . Preferably, the front channel steel 22 and the rear channel steel 302 have the same structure, the front beam 51 is a square tube, and the connection strength between the front channel steel 22 and the front beam 51 is high and easy to disassemble.

As shown in FIGS. 1 and 3 , preferably, the front handlebar assembly 1 includes a front outer rod 11 and a front inner rod 12 , and the front end of the front beam 51 is connected with the front outer rod 11 . The front inner rod 12 includes an upper rotation rod 121 and a lower rotation rod 122 arranged up and down. The lower rotation rod 122 rotates and passes through the front outer rod 11, and both ends of the lower rotation rod 122 protrude from the front outer rod 11. The lower rotation rod 122 The lower end is connected to the front wheel 8. The upper rotation rod 121 is rotatably connected with the upper end of the lower rotation rod 122 , and the upper rotation rod 121 can be rotated forward to a deployed position coaxially arranged with the lower rotation rod 122 , and can be rotated backward to a position arranged at an angle with the upper rotation rod 121 . In the folded position, preferably, the upper rotating rod 121 is in a working state when it is vertically arranged, and is in a folded position when it is in a horizontal position. The front handlebar assembly 1 with this structure can not only reduce the height of the front handlebar assembly 1 , but also enable the front handlebar assembly 1 to control the direction of the front wheel 8 .

Preferably, an upper locking member is connected to the upper end of the upper rotating rod 121, and a lower locking member is connected to the lower end of the lower rotating rod 122, and the upper locking member and the lower locking member are connected by bolts or clamped to realize the upward rotation The lever 121 is detachably connected to the lower lever 122 .

The folding process of the bicycle provided in this embodiment is as follows:

As shown in FIG. 1 and FIG. 2 , lift the intermediate shaft upward, so that the rear beam 52 is rotated downward and forward around the intermediate shaft, so that the rear channel steel 302 is separated from the rear seat assembly 4 , and the rear beam 52 is rotated to abut against the front beam 51 . , to complete the folding of the rear half of the self-proclaimed bicycle, and to achieve the purpose of reducing the size of the bicycle in the length direction;

As shown in Figures 1, 3 and 4, the rear seat assembly 4 is rotated backwards and downwards, and the front end of the limit rod 10 is separated from the rear handlebar assembly 3;

Rotate the rear handlebar assembly 3 backwards and downwards, separate the front channel steel 22 of the front seat assembly 2 from the front beam 51, rotate the rear outer rod 32 of the rear handlebar assembly 3, and make the front seat assembly 2 and the front support frame 20 Rotate 90° around the vertical axis, and then rotate the rear handlebar assembly 3 forward and downward around the horizontal axis until it abuts with the front beam 51;

The upper lever 121 of the front handlebar assembly 1 is separated from the lower lever 122, and the upper lever 121 is rotated backwards and downwards, the front handlebar is inserted into the front seat assembly 2, the oblique lever 201 and the cross bar 202 form a triangular structure (specifically, depending on the size of the upper turning bar 121, the front handlebar is also inserted into the rear side of the diagonal bar 201 or the front side of the cross bar 202). The above can realize the bicycle from the unfolded state to the folded state.

As shown in FIGS. 1 and 5 , the rear wheel set 7 includes a left wheel 71 and a right wheel 72 , and the left wheel 71 and the right wheel 72 are spaced apart in the left-right direction. The bicycle provided in this embodiment is a tricycle, and the front wheel 8 , the left wheel 71 and the right wheel 72 are located on the three vertices of the triangle, so that the bicycle can be effectively prevented from overturning and the safety of children can be guaranteed.

The rear wheel set 7 also includes a rear axle sleeve 73 connected to the rear end of the rear beam 52 , and a rear rotating shaft 74 is arranged in the rear axle sleeve 73 . The left wheel 71 and the right wheel 72 are connected by the rear rotating shaft 74 to realize coaxial rotation, and the rear axle sleeve 73 can reduce the exposure of the rotating moving parts and improve the safety performance of the bicycle. In order to ensure that the left wheel 71 and the right wheel 72 rotate synchronously, preferably, one of the left wheel 71 and the right wheel 72 is a driving wheel, and the other is a driven wheel, that is, one of the left wheel 71 and the right wheel 72 is fixedly connected to the rear rotating shaft 74, The other is rotatably connected to the rear shaft 74 .

As shown in FIG. 1 , preferably, the rear support frame 30 is connected with the rear axle sleeve 73. In order to improve the stability of the rear of the bicycle, the rear support frame 30 includes a triangular support body and a top rod connected to the corner of the support body, The rear channel steel 302 is connected to the upper end of the top rod, the other two top corners of the support body are respectively connected to a bottom rod, and the lower end of the bottom rod is connected to the outer side of the rear bushing 73 .

As shown in FIG. 5 , in order to drive the rear wheel set 7 to rotate, preferably, the bicycle further includes a transmission system 9 , and the transmission system 9 includes a front sprocket 91 , an intermediate sprocket set 92 , a front chain 93 , a rear sprocket 94 and a rear chain 95. The front sprocket 91 and the middle sprocket set 92 are respectively rotatably provided on the beam frame 5 in the front-rear direction. The front chain 93 is drivingly connected to the front sprocket 91 and the intermediate sprocket set 92 , the rear sprocket 94 is sleeved outside the rear shaft 74 , and the rear chain 95 is drivingly connected to the intermediate sprocket set 92 and the rear sprocket 94 .

Preferably, the front beam 51 is rotatably provided with a front shaft, both ends of the front shaft are connected with front pedals, and the front sprocket 91 is fixed to the front shaft and located on one side of the front beam 51 . The intermediate sprocket set 92 includes two left sprockets disposed on one side of the front beam 51 , and the front chain 93 is drivingly connected to one of the left sprockets. In order to improve the rotational stability of the rear shaft 74 , the intermediate sprocket set 92 further includes a right sprocket, and the right sprocket is located on the other side of the front beam 51 . Two rear sprockets 94 are arranged on the rear rotating shaft 74 at intervals, and two rear chains 95 are arranged. The sprocket is drivingly connected to another rear sprocket 94 .

In order that the adult can see the child's condition at any time, the child sits on the front seat assembly 2 and the adult sits on the rear seat assembly 4 . In order to enable the child to control the steering of the bicycle and to exercise the control ability of the child, the front handlebar assembly 1 is connected to the front wheel 8 , and the rotation of the front handlebar assembly 1 can control the steering of the front wheel 8 . In order to prevent children from being unable to avoid the danger accurately and in time, in this embodiment, an adult sitting on the rear seat assembly 4 can also control the steering of the front wheels 8 through the rear handlebar assembly 3. Specifically, the front end of the aforementioned steering system 6 Connected with the front handlebar assembly 1 , the rear end of the steering system 6 is connected with the rear handlebar assembly 3 , so that the rear handlebar assembly 3 drives the front handlebar assembly 1 to rotate. The steering system 6 provided in this embodiment can make the rear handlebar assembly 3 and the front handlebar assembly 1 rotate synchronously, and both the rear handlebar assembly 3 and the front handlebar assembly 1 can control the steering of the bicycle, thereby avoiding danger in time.

1, preferably, the rear handlebar assembly 3 further includes a rear steering rod 33 and a rear handlebar body 34, the rear steering rod 33 is rotatably connected with the upper end of the rear outer rod 32, and the rear handlebar body 34 is connected to the rear steering rod 33. The upper end is fixedly connected, the rear handle body 34 includes a left handle and a right handle, an adult sits on the rear seat assembly 4, and the left and right hands respectively hold the left handle and the right handle.

As shown in FIG. 6 , the steering system 6 includes a front fixing block 61 , a left control assembly 62 , and a right control assembly 63 . The front fixing block 61 is connected with the front handlebar assembly 1. Preferably, the front fixing block 61 includes a ferrule 611 and a left plug-in block 612 and a right plug-in block 613 respectively disposed on opposite sides of the ferrule 611. The ferrule 611 covers It is arranged on the front inner rod 12 of the front handlebar assembly 1. The rotation of the ferrule 611 can drive the front inner rod 12 to rotate, and then the front inner rod 12 drives the front wheel 8 to turn to realize the steering of the bicycle. The front end of the left control assembly 62 is connected with the left insertion block 612 of the front fixing block 61 and is located on the left side of the front handlebar assembly 1 , and the rear end of the left control assembly 62 is connected with the left handle of the rear handlebar assembly 3 . The front end of the right control assembly 63 is connected with the right insertion block 613 of the front fixing block 61 and is located on the right side of the front handlebar assembly 1, and the rear end of the right control assembly 63 is connected with the right handle of the rear handlebar assembly 3, and the rear The handlebar assembly 3 drives the front handlebar assembly 1 to rotate through the left control assembly 62 and the right control assembly 63 .

Specifically, the steering system 6 further includes an abutment block 64 , the left control assembly 62 includes a left spring 621 and a left cable 622 , and the right control assembly 63 includes a right spring 631 and a right cable 632 . The left cable 622 and the right cable 632 are preferably steel wire ropes.

The abutting block 64 is connected to the rear handlebar assembly 3 , and the abutting block 64 is provided with left and right perforations spaced along the left-right direction.

The rear end of the left spring 621 is in contact with the abutment block 64 , and the front end of the left spring 621 is in contact with the front fixing block 61 and is located on the left side of the front handlebar assembly 1 . The rear end of the right spring 631 is in contact with the abutment block 64 , and the front end of the right spring 631 is in contact with the front fixing block 61 and is located on the right side of the front handlebar assembly 1 .

The left cable 622 passes through the left spring 621 and the left through hole, the rear end of the left cable 622 is connected with the left handle of the rear handlebar assembly 3, the front end of the left cable 622 is connected with the front fixing block 61, and the left cable 622 Located on the left side of the front handlebar assembly 1 , preferably, the front end of the left stay cable 622 passes through the left plug-in block 612 and is fixedly connected with the left plug-in block 612 .

The right cable 632 passes through the right spring 631 and the right through hole. Located on the right side of the front handlebar assembly 1 , preferably, the front end of the right cable 632 passes through the right plug-in block 613 and is fixedly connected with the right plug-in block 613 .

Preferably, in order to shorten the lengths of the left spring 621 and the right spring 631 and avoid bending of the left spring 621 and the right spring 631 during the turning process of the bicycle, preferably, the steering system 6 further includes a left sleeve 623 and a right sleeve 633. The sleeve 623 is located between the left spring 621 and the abutting block 64 , and the left pull cable 622 is passed through the left through hole, the left sleeve 623 and the left spring 621 in sequence. The right sleeve 633 is located between the right spring 631 and the abutting block 64 , and the right pull cable 632 is passed through the right through hole, the right sleeve 633 and the right spring 631 in sequence. The front fixing block 61 can be arranged in the front outer rod 11 , and the left cable 622 and the right cable 632 can be connected to the front fixing block 61 after passing through the rear outer rod 32 and the front beam 51 . Alternatively, the front fixing block 61 can be fixedly connected to the upper rotating rod 121 or the lower rotating rod 122, and is located outside the front outer rod 11, and the left cable 622 and the right cable 632 can be located outside the rear outer rod 32 and the front beam 51. .

In this embodiment, the working process and working principle of the steering system 6 are described by taking an adult controlling a bicycle to turn left as an example:

The adult sitting on the rear seat assembly 4 controls the rear handlebar body 34 to rotate counterclockwise, that is, the left handle of the rear handlebar body 34 rotates in a direction away from the front handlebar assembly 1 , and the right handle of the rear handlebar body 34 moves closer to the front vehicle Rotate the direction of the assembly 1, the left spring 621 is stretched, the right spring 631 is compressed, the front fixing block 61 rotates counterclockwise, and the front fixing block 61 drives the front inner rod 12 to rotate counterclockwise, so that the front inner rod 12 drives the front wheel 8 Turn left and realize the left turn of the self-proclaimed car.

The principle of turning a bicycle right and turning left is the same, and will not be repeated here.

Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the embodiments of the present invention. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

1. A bicycle, comprising: by preceding handlebar assembly (1), front seat subassembly (2), back handlebar assembly (3) and back seat subassembly (4) that set gradually after to, its characterized in that still includes:

a beam frame (5), wherein the front handlebar assembly (1), the front seat assembly (2), the rear handlebar assembly (3) and the rear seat assembly (4) are respectively connected with the beam frame (5), the beam frame (5) comprises a front beam (51) and a rear beam (52), and the front beam (51) is rotatably connected with the rear beam (52) so as to enable the bicycle to be in an unfolded state and a folded state;

steering system (6), the lower extreme of front handlebar subassembly (1) is connected with front wheel (8), front handlebar subassembly (1) is rotated and can be controlled front wheel (8) turn to, steering system's (6) the front end with front handlebar subassembly (1) is connected, steering system's (6) the rear end with back handlebar subassembly (3) are connected, so that back handlebar subassembly (3) can drive front handlebar subassembly (1) rotates.

2. Bicycle according to claim 1, characterized in that the steering system (6) comprises:

the front fixing block (61) is connected with the front handlebar assembly (1);

the front end of the left control assembly (62) is connected with the front fixing block (61) and is positioned on the left side of the front handlebar assembly (1), and the rear end of the left control assembly (62) is connected with the left handle of the rear handlebar assembly (3);

right control assembly (63), the front end of right side control assembly (63) with preceding fixed block (61) is connected, and is located the right side of preceding handlebar assembly (1), the rear end of right side control assembly (63) with the right handle of back handlebar assembly (3) is connected, back handlebar assembly (3) are passed through left side control assembly (62) with right side control assembly (63) drive preceding handlebar assembly (1) rotates.

3. The bicycle of claim 1, wherein a rear wheel set (7) is connected to a rear end of the rear beam (52), the rear wheel set (7) comprising:

a left wheel (71) and a right wheel (72) which are arranged at intervals in the left-right direction;

the rear axle sleeve (73) is connected to the rear end of the rear beam (52), a rear rotating shaft (74) is arranged in the rear axle sleeve (73), and the left wheel (71) and the right wheel (72) are respectively connected to two ends of the rear rotating shaft (74).

4. The bicycle according to claim 1, wherein the rear seat assembly (4) comprises a rear seat post (41), the rear seat post (41) being rotatably disposed to the front beam (51) in a fore-and-aft direction; the bicycle further comprises:

the rear support frame (30), the rear end of rear support frame (30) connect in back roof beam (52), the front end of rear support frame (30) detachably with back seat branch (41) are connected, back seat branch (41), back roof beam (52) with rear support frame (30) form the triangle-shaped structure.

5. The bicycle according to claim 4, characterized in that the rear seat strut (41) comprises an upper strut (411) and a lower strut (412) rotatably connected to enable the rear seat strut (41) to be folded; the lower end of the lower support rod (412) is rotatably connected with the front beam (51).

6. The bicycle of claim 1, wherein the lower end of the rear handlebar assembly (3) is connected to the front beam (51) in a forward and backward rotatable manner; the bicycle further comprises:

the one end of gag lever post (10) with back handlebar subassembly (3) with one fixed connection in back seat subassembly (4), the other end of gag lever post (10) with back handlebar subassembly (3) with another in back seat subassembly (4) can dismantle the connection.

7. The bicycle of claim 6, wherein the rear handlebar assembly (3) comprises:

the lower end of the rear inner rod (31) is rotatably connected with the front beam (51);

the rear outer rod (32) is sleeved outside the rear inner rod (31) and can rotate relative to the rear inner rod (31), the front seat assembly (2) is connected with the rear outer rod (32), and the lower end of the front seat assembly (2) is detachably connected with the front beam (51).

8. Bicycle according to any of claims 1 to 7, characterized in that the front seat assembly (2) comprises:

a front seat post (21), said front seat post (21) being connected to said rear handlebar assembly (3);

the lower end of the front seat support rod (21) is connected with the front channel steel (22), and the front channel steel (22) can be spliced with the front beam (51).

9. Bicycle according to claim 1, characterized in that the front handlebar assembly (1) comprises:

the front end of the front beam (51) is connected with the front outer rod (11);

interior pole (12) in the front, including setting up from top to bottom and rotating last bull stick (121) and lower bull stick (122) of connecting, just go up bull stick (121) can rotate extremely with the expansion position of lower bull stick (122) coaxial setting to and can rotate extremely with it is the folding position that angle set up to go up bull stick (121), bull stick (122) rotate down and wear to locate preceding outer pole (11), the lower extreme of lower bull stick (122) is connected with front wheel (8).

10. A bicycle according to claim 3, characterized in that the bicycle further comprises a transmission system (9), the transmission system (9) comprising:

a front chain wheel (91) and a middle chain wheel group (92) which are respectively arranged on the beam frame (5) in a rotating way along the front and back direction;

the front chain (93) is in transmission connection with the front chain wheel (91) and the middle chain wheel set (92);

the rear chain wheel (94) is sleeved outside the rear rotating shaft (74);

and the rear chain (95) is in transmission connection with the middle chain wheel set (92) and the rear chain wheel (94).

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