A bicycle

Abstract

The present invention relates to the technical field of transportation tools, and specifically discloses a bicycle, which includes 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 to 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 children to control the steering of the bicycle and achieve the purpose of exercising children's control ability, the child sits on the front seat assembly to control the front handlebar assembly, and the front handlebar assembly is connected to 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 danger accurately and timely, 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. The adult sitting on the rear seat assembly controls the rotation of the front handlebar assembly through the rear handlebar assembly, and then controls the rotation of the front wheel to achieve the steering of the bicycle.

Description

Technical Field

[0001] The present invention relates to the technical field of transportation tools, and in particular to a bicycle. Background Art

[0002] As people's living standards improve, they pay more attention to accompanying their children, and there are more activities such as taking children on outings. In the prior art, bicycles for two people are generally controlled by the front handlebar, and the rear handlebar is not provided or the rear handlebar is fixed and cannot be used to control the direction. Since children have poor control over bicycles and poor ability to predict danger, 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 play the role of exercising the child's control ability. In addition, due to the large size of the double bicycle, it is inconvenient to be carried to the suburbs, which affects the use of users.

[0003] Therefore, there is an urgent need for a bicycle that is high in safety and easy to carry. Summary of the invention

[0004] The object of the present invention is to provide a bicycle to improve the safety of the bicycle and make the bicycle easy to carry.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A bicycle comprises: a front handlebar assembly, a front seat assembly, a rear handlebar assembly and a rear seat assembly which are arranged in sequence from front to rear, and further comprises:

[0007] A beam frame, the front handlebar assembly, the front seat assembly, the rear handlebar assembly and the rear seat assembly are respectively connected to the beam frame, the beam frame includes a front beam and a rear beam, the front beam is rotatably connected to the rear beam, so that the bicycle can be in an unfolded state and a folded state;

[0008] A steering system, wherein the lower end of the front handlebar assembly is connected to a front wheel, and rotation of the front handlebar assembly can control the steering of the front wheel. 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, so that the rear handlebar assembly can drive the front handlebar assembly to rotate.

[0009] Preferably, the steering system comprises:

[0010] A front fixing block connected to the front handlebar assembly;

[0011] A left control assembly, wherein the front end of the left control assembly is connected to the front fixing block and is located on the left side of the front handlebar assembly, and the rear end of the left control assembly is connected to the left handle of the rear handlebar assembly;

[0012] A right control assembly, wherein the front end of the right control assembly is connected to the front fixing block and is located on the right side of the front handlebar assembly, and the rear end of the right control assembly is connected to the right handle of the rear handlebar assembly, and the rear handlebar assembly drives the front handlebar assembly to rotate through the left control assembly and the right control assembly.

[0013] Preferably, the rear end of the rear beam is connected to a rear wheel set, and the rear wheel set comprises:

[0014] The left wheel and the right wheel are arranged at intervals along the left-right direction;

[0015] A rear axle sleeve is connected to the rear end of the rear beam, a rear rotating shaft is arranged in the rear axle sleeve, and the left wheel and the right wheel are respectively connected to the two ends of the rear rotating shaft.

[0016] Preferably, the rear seat assembly comprises a rear seat support rod, and the rear seat support rod is rotatably arranged on the front beam; the bicycle further comprises:

[0017] A rear support frame, the rear end of which is connected to the rear beam, the front end of which is detachably connected to the rear seat support rod, and the rear seat support rod, the rear beam and the rear support frame form a triangular structure.

[0018] Preferably, the rear seat support rod comprises an upper support rod and a lower support rod which are rotatably connected so that the rear seat support rod can be folded; and the lower end of the lower support rod is rotatably connected to the front beam.

[0019] Preferably, the lower end of the rear handlebar assembly is connected to the front beam so as to be rotatable forward and backward; the bicycle further comprises:

[0020] A limit rod, one end of which is fixedly connected to one of the rear handlebar assembly and the rear seat assembly, and the other end of which is detachably connected to the other of the rear handlebar assembly and the rear seat assembly.

[0021] Preferably, the rear handlebar assembly comprises:

[0022] A rear inner rod, the lower end of which is rotatably connected to the front beam;

[0023] The rear outer rod is sleeved outside the rear inner rod and can rotate relative to the rear inner rod. The front seat assembly is connected to the rear outer rod, and the lower end of the front seat assembly is detachably connected to the front beam.

[0024] Preferably, the front seat assembly comprises:

[0025] A front seat support rod, the front seat support rod being connected to the rear handlebar assembly;

[0026] A front channel steel, the lower end of the front seat support rod is connected to the front channel steel, and the front channel steel can be plugged into the front beam.

[0027] Preferably, the front handlebar assembly comprises:

[0028] A front outer rod, the front end of the front beam being connected to the front outer rod;

[0029] The front inner rod includes an upper rotating rod and a lower rotating rod which are arranged up and down and rotatably connected, and the upper rotating rod can be rotated to an unfolded position coaxially arranged with the lower rotating rod, and can be rotated to a folded position arranged at an angle with the upper rotating rod. The lower rotating rod is rotatably passed through the front outer rod, and the lower end of the lower rotating rod is connected to the front wheel.

[0030] Preferably, the bicycle further comprises a transmission system, wherein the transmission system comprises:

[0031] The front sprocket and the middle sprocket set are respectively rotatably arranged on the beam frame along the front and rear directions;

[0032] A front chain, drivingly connected to the front sprocket and the intermediate sprocket set;

[0033] A rear sprocket, sleeved outside the rear rotating shaft;

[0034] The rear chain is drivingly connected to the intermediate sprocket set and the rear sprocket.

[0035] Beneficial effects of the present invention:

[0036] The front beam 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 so that the user can put the bicycle in the trunk of the car, making the bicycle easy to carry. In order to enable adults to see the status of children at any time, the children sit on the front seat assembly to control the front handlebar assembly, and the adults sit on the rear seat assembly to control the rear handlebar assembly. In order to enable children to control the steering of the bicycle and achieve the purpose of exercising children's control ability, the front handlebar assembly is connected to 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 danger accurately and timely, 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. The adult sitting on the rear seat assembly controls the rotation of the front handlebar assembly through the rear handlebar assembly, so that the front handlebar assembly and the rear handlebar assembly can move synchronously, thereby controlling the steering of the front wheel and realizing the steering of the bicycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1is a schematic structural diagram of a bicycle provided by an embodiment of the present invention in an unfolded state;

[0038] Figure 2 is a structural schematic diagram of a bicycle provided by an embodiment of the present invention in a folded state;

[0039] Figure 3 is a partial structural schematic diagram of a bicycle provided by an embodiment of the present invention in a folded state;

[0040] Figure 4 yes Figure 3 A schematic diagram of the structure of the bicycle from another perspective;

[0041] Figure 5 is a partial structural schematic diagram of a bicycle provided by an embodiment of the present invention in an unfolded state;

[0042] Figure 6 It is a schematic structural diagram of a steering system of a bicycle provided in an embodiment of the present invention.

[0043] In the figure:

[0044] 1. front handlebar assembly; 11. front outer rod; 12. front inner rod; 121. upper rotating rod; 122. lower rotating rod;

[0045] 2. Front seat assembly; 21. Front seat support rod; 22. Front channel steel;

[0046] 3. rear handlebar assembly; 31. rear inner rod; 32. rear outer rod; 33. rear steering rod; 34. rear handlebar body;

[0047] 4. rear seat assembly; 41. rear seat support rod; 411. upper support rod; 412. lower support rod;

[0048] 5. beam frame; 51. front beam; 52. rear beam;

[0049] 6. Steering system;

[0050] 61, front fixing block; 611, ferrule; 612, left plug-in block; 613, right plug-in block;

[0051] 62, left control assembly; 621, left spring; 622, left cable; 623, left sleeve;

[0052] 63, right control assembly; 631, right spring; 632, right cable; 633, right sleeve;

[0053] 64. abutment block;

[0054] 7, rear wheel assembly; 71, left wheel; 72, right wheel; 73, rear axle sleeve; 74, rear rotating shaft;

[0055] 8. Front wheel;

[0056] 9. Transmission system; 91. Front sprocket; 92. Intermediate sprocket set; 93. Front chain; 94. Rear sprocket; 95. Rear chain;

[0057] 10. Limit rod;

[0058] 20, front support frame; 201, diagonal bar; 202, cross bar;

[0059] 30. rear support frame; 301. rear support frame body; 302. rear channel steel;

[0060] 40. Mounting frame. DETAILED DESCRIPTION

[0061] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It is also necessary to explain that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all.

[0062] Some directional words are defined in the present invention. Unless otherwise specified, the directional words used, such as "up", "down", "left", "right", "inside" and "outside", are used to facilitate understanding and therefore do not constitute a limitation on the scope of protection of the present invention.

[0063] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0064] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] This embodiment provides a bicycle that can be used by adults and children when they go on outings or play, but is not limited to this and can also be used in other occasions to improve its safety and portability.

[0066] like Figure 1 and Figure 2 As shown, 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 which are arranged in sequence from front to rear, and also includes a beam frame 5 and a 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 to the beam frame 5.

[0067] 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 is rotatably connected to the rear beam 52 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 roughly horizontally arranged 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 and the rear wheel set 7 connected to the rear beam 52 can rotate about 150°-170°, so that the size of the bicycle in the folded state in the height direction will not increase. 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 rotate arbitrarily within the 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 and 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 and right direction is the left and right direction when the user rides the bicycle, or the left and right direction when facing the bicycle.

[0068] Preferably, the front beam 51 and the rear beam 52 are rotatably connected via a central shaft. Furthermore, the front beam 51 is provided with a central shaft hole, the central shaft is rotatably inserted into the central shaft hole, and both ends of the central shaft extend out of the central shaft hole. The rear beam 52 includes two beam plates arranged in parallel, and the two beam plates are rotatably connected to both ends of the shaft hole extending out of the central shaft.

[0069] like Figure 1 and Figure 2 As shown, the rear seat assembly 4 includes a rear seat support rod 41, which is rotatably arranged on the front beam 51. Specifically, the rotation axis of the rear seat support rod 41 is parallel to the rotation axis of the rear beam 52, and the rear seat support rod 41 rotates forward and downward to reduce the height of the bicycle. The rear seat assembly 4 may also include a rear seat, which is connected to the upper end of the rear seat support rod 41.

[0070] In order to improve the stability of the rear seat assembly 4 when the bicycle is in the unfolded state and prevent the rear seat assembly 4 from rotating backward and downward during riding, the bicycle further includes a rear support frame 30, the rear end of the rear support frame 30 is connected to the rear beam 52, and preferably, the rear end of the rear support frame 30 is connected to the rear beam 52 through the rear wheel group 7. The front end of the rear support frame 30 is detachably connected to 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 tilted backward, that is, the rear seat support rod 41 is respectively arranged at an acute angle with the rear beam 52 and the rear support frame 30, which can improve the stability of the rear seat support rod 41 on the one hand, and prevent the rear wheel group 7 and the rear beam 52 from rotating when the bicycle passes through a ditch or ridge on the other hand.

[0071] like Figure 1 and Figure 2 As shown, 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. Furthermore, the rear channel steel 302 includes a bottom plate and two side plates connected to both ends of the bottom plate, and the bottom plate and the two side plates are connected to form a U-shaped channel steel. The rear seat support rod 41 is made of square steel. The contact area between the rear seat support rod 41 and the rear channel steel 302 of this structure is large, thereby improving the stability of its connection. Of course, in other embodiments, the rear seat support rod 41 can also be a round tube. Such adjustment and change of the specific structure of the rear seat support rod 41 does not deviate from the principle and scope of the present invention, and should be limited within the protection scope of the present invention.

[0072] like Figure 2 As shown, preferably, the rear seat support rod 41 is rotatably connected to the front beam 51 through the mounting frame 40, and 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-shaped structure. The lower side of the bottom plate is connected to the front beam 51, and the two ear plates are provided with shaft holes at positions facing each other, and the connecting shaft is passed through the two shaft holes and the rear seat support rod 41, so as to realize the rotatable connection between the rear seat support rod 41 and the front beam 51.

[0073] like Figure 1 and Figure 2As shown, 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 to the front beam 51, and the upper end of the upper support rod 411 is connected to the rear seat. 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, thereby avoiding the rear seat support rod 41 from interfering with 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 integrated structure. When the bicycle is folded, the rear seat support rod 41 is rotated forward and downward as a whole to achieve folding.

[0074] like Figure 1 , Figure 3 and Figure 4 As shown, preferably, the lower end of the rear handlebar assembly 3 is connected to the front beam 51 so as to be rotatable forward and backward. In this embodiment, the rear handlebar assembly 3 can be rotated around a horizontal axis and a vertical axis, wherein the horizontal axis is parallel to the rotation axis of the rear beam 52.

[0075] like Figure 1 As shown, in order to limit the rear handlebar assembly 3 of the bicycle in the unfolded state from rotating around the horizontal axis, the bicycle further includes a limiting rod 10, the front end of which is detachably connected to the rear handlebar assembly 3, and the rear end of which is fixedly connected to the rear seat assembly 4. When the bicycle is folded, the limiting 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 rotates forward and downward around the horizontal axis, thereby reducing the size of the bicycle in the height direction.

[0076] Preferably, the limiting rod 10 includes a limiting rod body and an arc plate connected to the front end of the limiting rod body, the arc plate having an arc groove, and the arc groove can be plugged with the front handlebar assembly 1. Of course, in other embodiments, the front end of the limiting rod 10 can be fixedly connected to the rear handlebar assembly 3, and the rear end of the limiting rod 10 can be detachably connected to the rear seat assembly 4.

[0077] like Figure 3 As shown, preferably, the rear handlebar assembly 3 is rotatably connected to the front beam 51 through another mounting frame 40, and the connecting shaft is passed through the two shaft holes and the lower end of the rear handlebar assembly 3, thereby realizing the rotatable connection between the rear handlebar assembly 3 and the front beam 51.

[0078] like Figure 1 and Figure 3As shown, 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 rotates integrally with the front seat assembly 2, thereby increasing the folding and opening speed of the bicycle. In order to avoid interference between the rear handlebar assembly 3 and the front seat assembly 2 when they rotate forward and downward integrally, the rear handlebar assembly 3 and the front seat assembly 2 first rotate backward and downward around the horizontal axis, so that the front handlebar assembly 1 is separated from the front beam 51, and then the rear handlebar assembly 3 rotates 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 rotated forward and downward about 180° around the horizontal axis, so that 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 rotates 90° around the vertical axis, and when the bicycle is in the folded state, the length direction of the rear handlebar body 34 of the rear handlebar assembly 3 is consistent with the vertical direction, thereby reducing the size of the bicycle in the left and right directions.

[0079] 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 to the front beam 51. Specifically, the lower end of the rear inner rod 31 is rotatably connected to the rear beam 52 through the mounting frame 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 to the rear outer rod 32, so that the front seat assembly 2 is driven to rotate while the rear outer rod 32 rotates.

[0080] 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 includes a cross bar 202 and an inclined rod 201, the front end of the cross bar 202 is connected to the front seat assembly 2, and the rear end of the cross bar 202 is connected to the rear outer rod 32 of the rear handlebar assembly 3. The upper end of the inclined rod 201 is connected to the rear end of the cross bar 202 and the rear outer rod 32, and the lower end of the inclined rod 201 is connected to the lower end of the front seat assembly 2, and the front seat assembly 2, the inclined rod 201 and the cross bar 202 form a triangular structure, and the front beam 51, the rear handlebar assembly 3 and the inclined rod 201 form a triangular structure.

[0081] 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 to the rear handlebar assembly 3, the upper end of the front seat support rod 21 is connected to the front seat, the lower end of the front seat support rod 21 is connected to the front channel steel 22, and the front channel steel 22 can be plugged into the front beam 51. Preferably, the front channel steel 22 has the same structure as the rear channel steel 302, 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.

[0082] like Figure 1 and Figure 3 As shown, 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 to the front outer rod 11. The front inner rod 12 includes an upper rotating rod 121 and a lower rotating rod 122 arranged up and down, the lower rotating rod 122 is rotatably arranged in the front outer rod 11, and the two ends of the lower rotating rod 122 extend out of the front outer rod 11, and the lower end of the lower rotating rod 122 is connected to the front wheel 8. The upper rotating rod 121 is rotatably connected to the upper end of the lower rotating rod 122, and the upper rotating rod 121 can be rotated forward to an unfolded position coaxially arranged with the lower rotating rod 122, and can be rotated backward to a folded position arranged at an angle with the upper rotating rod 121. Preferably, the upper rotating rod 121 is in a working state when it is vertically arranged, and in a folded position when it is in a horizontal position. The front handlebar assembly 1 of 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.

[0083] Preferably, the upper end of the upper rotating rod 121 is connected to an upper locking piece, and the lower end of the lower rotating rod 122 is connected to a lower locking piece. The upper locking piece and the lower locking piece are connected or clamped by bolts to achieve a detachable connection between the upper rotating rod 121 and the lower rotating rod 122.

[0084] The folding process of the bicycle provided in this embodiment is as follows:

[0085] like Figure 1 and Figure 2 As shown, the central shaft is lifted upward, so that the rear beam 52 rotates downward and forward around the central shaft, so that the rear channel steel 302 is separated from the rear seat assembly 4, and the rear beam 52 rotates to abut against the front beam 51, completing the folding of the rear half of the bicycle and achieving the purpose of reducing the size of the bicycle in the length direction;

[0086] like Figure 1 , Figure 3 and Figure 4 As shown, the rear seat assembly 4 is rotated backward and downward, and the front end of the limit rod 10 is separated from the rear handlebar assembly 3;

[0087] The rear handlebar assembly 3 is rotated backward and downward, and the front channel steel 22 of the front seat assembly 2 is separated from the front beam 51, and the rear outer rod 32 of the rear handlebar assembly 3 is rotated to rotate the front seat assembly 2 and the front support frame 20 90° around the vertical axis, and then the rear handlebar assembly 3 is rotated forward and downward around the horizontal axis until it abuts against the front beam 51;

[0088] The upper rotating rod 121 of the front handlebar assembly 1 is separated from the lower rotating rod 122, and the upper rotating rod 121 is rotated backward and downward, and the front handlebar is inserted into the triangular structure formed by the front seat assembly 2, the oblique rod 201 and the cross rod 202 (specifically, according to the size of the upper rotating rod 121, the front handlebar is inserted into the rear side of the oblique rod 201 or the front side of the cross rod 202). The above can realize the bicycle from the unfolded state to the folded state.

[0089] like Figure 1 and Figure 5 As shown, the rear wheel group 7 includes a left wheel 71 and a right wheel 72, and the left wheel 71 and the right wheel 72 are arranged at intervals 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 at the three vertices of a triangle, so that the bicycle can be effectively prevented from tipping over, providing protection for the safety of children.

[0090] The rear wheel assembly 7 further includes a rear axle sleeve 73, which is connected to the rear end of the rear beam 52. A rear shaft 74 is arranged in the rear axle sleeve 73, and the left wheel 71 and the right wheel 72 are respectively connected to the two ends of the rear shaft 74. The left wheel 71 and the right wheel 72 are connected through the rear shaft 74 to achieve coaxial rotation. 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 shaft 74, and the other is rotatably connected to the rear shaft 74.

[0091] like Figure 1 As shown, preferably, the rear support frame 30 is connected to the rear axle sleeve 73. 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 corners of the support body. The rear channel steel 302 is connected to the upper end of the top rod, and a bottom rod is respectively connected to the other two top corners of the support body. The lower end of the bottom rod is connected to the outer side of the rear axle sleeve 73.

[0092] like Figure 5 As shown, in order to drive the rear wheel group 7 to rotate, preferably, the bicycle further includes a transmission system 9, which includes a front sprocket 91, an intermediate sprocket group 92, a front chain 93, a rear sprocket 94 and a rear chain 95. The front sprocket 91 and the intermediate sprocket group 92 are respectively rotatably arranged on the beam frame 5 along the front and rear directions. The front chain 93 is transmission-connected with the front sprocket 91 and the intermediate sprocket group 92, the rear sprocket 94 is sleeved outside the rear rotating shaft 74, and the rear chain 95 is transmission-connected with the intermediate sprocket group 92 and the rear sprocket 94.

[0093] Preferably, a front shaft is rotatably arranged on the front beam 51, and both ends of the front shaft are connected to front pedals. The front sprocket 91 is fixed to the front shaft and is located on one side of the front beam 51. The intermediate sprocket set 92 includes two left sprockets arranged 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 rotation stability of the rear shaft 74, the intermediate sprocket set 92 also 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 shaft 74 at intervals, and two rear chains 95 are arranged, one rear chain 95 is drivingly connected to the right sprocket and one of the rear sprockets 94, and the other rear chain 95 is drivingly connected to the other left sprocket and the other rear sprocket 94.

[0094] In order to enable adults to see the status of children at any time, children sit on the front seat assembly 2 and adults sit on the rear seat assembly 4. In order to enable children to control the steering of the bicycle and achieve the purpose of exercising children's control ability, 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 danger accurately and in time, in this embodiment, the adult sitting on the rear seat assembly 4 can also control the steering of the front wheel 8 through the rear handlebar assembly 3. Specifically, the front end of the aforementioned steering system 6 is connected to the front handlebar assembly 1, and the rear end of the steering system 6 is connected to 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 rotate synchronously with the front handlebar assembly 1, 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.

[0095] like Figure 1 Preferably, the rear handlebar assembly 3 also includes a rear steering rod 33 and a rear handlebar body 34. The rear steering rod 33 is rotatably connected to the upper end of the rear outer rod 32, and the rear handlebar body 34 is fixedly connected to the upper end of the rear steering rod 33. The rear handlebar body 34 includes a left handle and a right handle. An adult sits on the rear seat assembly 4, and holds the left handle and the right handle with his left and right hands respectively.

[0096] like Figure 6 As shown, 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 to the front handlebar assembly 1. Preferably, the front fixing block 61 includes a hoop 611 and a left plug-in block 612 and a right plug-in block 613 respectively arranged on opposite sides of the hoop 611. The hoop 611 is sleeved on the front inner rod 12 of the front handlebar assembly 1. The rotation of the hoop 611 can drive the front inner rod 12 to rotate, and then the front inner rod 12 drives the front wheel 8 to turn, so as to realize the steering of the bicycle. The front end of the left control assembly 62 is connected to the left plug-in block 612 of the front fixing block 61 and is located on the left side of the front handlebar assembly 1. The rear end of the left control assembly 62 is connected to the left handle of the rear handlebar assembly 3. The front end of the right control component 63 is connected to the right plug-in block 613 of the front fixing block 61 and is located on the right side of the front handlebar component 1. The rear end of the right control component 63 is connected to the right handle of the rear handlebar component 3. The rear handlebar component 3 drives the front handlebar component 1 to rotate through the left control component 62 and the right control component 63.

[0097] 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 cables.

[0098] The abutment block 64 is connected to the rear handlebar assembly 3 , and is provided with a left through hole and a right through hole spaced apart in the left-right direction.

[0099] The rear end of the left spring 621 abuts against the abutment block 64, and the front end of the left spring 621 abuts against 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 abuts against the abutment block 64, and the front end of the right spring 631 abuts against the front fixing block 61 and is located on the right side of the front handlebar assembly 1.

[0100] 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 to the left handle of the rear handlebar assembly 3, the front end of the left cable 622 is connected to the front fixing block 61, and the left cable 622 is located on the left side of the front handlebar assembly 1. Preferably, the front end of the left cable 622 passes through the left plug-in block 612 and is fixedly connected to the left plug-in block 612.

[0101] The right cable 632 is passed through the right spring 631 and the right through hole, the rear end of the right cable 632 is connected to the right handle of the rear handlebar assembly 3, the front end of the right cable 632 is connected to the front fixing block 61, and the right cable 632 is located on the right side of the front handlebar assembly 1. Preferably, the front end of the right cable 632 is passed through the right plug-in block 613 and is fixedly connected to the right plug-in block 613.

[0102] Preferably, in order to shorten the length of the left spring 621 and the right spring 631 and prevent the left spring 621 and the right spring 631 from bending during the steering process of the bicycle, preferably, the steering system 6 further includes a left sleeve 623 and a right sleeve 633, the left sleeve 623 is located between the left spring 621 and the abutment block 64, and the left cable 622 is sequentially inserted through the left through hole, the left sleeve 623 and the left spring 621. The right sleeve 633 is located between the right spring 631 and the abutment block 64, and the right cable 632 is sequentially inserted through the right through hole, the right sleeve 633 and the right spring 631. 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 being inserted through the rear outer rod 32 and the front beam 51. Alternatively, the front fixing block 61 may be fixedly connected to the upper rotating rod 121 or the lower rotating rod 122 and located outside the front outer rod 11 , and the left cable 622 and the right cable 632 may be located outside the rear outer rod 32 and the front beam 51 .

[0103] In this embodiment, an adult controlling a bicycle to turn left is taken as an example to illustrate the working process and working principle of the steering system 6:

[0104] 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 the direction away from the front handlebar assembly 1, and the right handle of the rear handlebar body 34 rotates in the direction close to the front handlebar 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, thereby making the front inner rod 12 drive the front wheel 8 to turn left, thereby realizing the left turn of the self-propelled vehicle.

[0105] The principles of turning right and left are the same and will not be elaborated here.

[0106] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A bicycle comprising: A front handlebar assembly (1), a front seat assembly (2), a rear handlebar assembly (3) and a rear seat assembly (4) are arranged in sequence from front to rear, and are characterized in that they further include: A beam frame (5), the front handlebar assembly (1), the front seat assembly (2), the rear handlebar assembly (3) and the rear seat assembly (4) are respectively connected to the beam frame (5), the beam frame (5) comprises a front beam (51) and a rear beam (52), 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; A steering system (6), wherein the lower end of the front handlebar assembly (1) is connected to a front wheel (8), and the front handlebar assembly (1) can be rotated to control the steering of the front wheel (8), the front end of the steering system (6) is connected to the front handlebar assembly (1), and the rear end of the steering system (6) is connected to the rear handlebar assembly (3), so that the rear handlebar assembly (3) can drive the front handlebar assembly (1) to rotate; The rear seat assembly (4) comprises a rear seat support rod (41), and the rear seat support rod (41) is arranged on the front beam (51) so as to be rotatable forward and backward; the bicycle further comprises: a rear support frame (30), wherein the rear end of the rear support frame (30) is connected to the rear beam (52), and the front end of the rear support frame (30) is detachably connected to 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; The rear seat support rod (41) comprises an upper support rod (411) and a lower support rod (412) which are rotatably connected, so that the rear seat support rod (41) can be folded; the lower end of the lower support rod (412) is rotatably connected to the front beam (51); The lower end of the rear handlebar assembly (3) is connected to the front beam (51) in a manner that allows it to rotate forward and backward. The bicycle further comprises: A limit rod (10), one end of the limit rod (10) being fixedly connected to one of the rear handlebar assembly (3) and the rear seat assembly (4), and the other end of the limit rod (10) being detachably connected to the other of the rear handlebar assembly (3) and the rear seat assembly (4).

2. The bicycle according to claim 1, characterized in that: The steering system (6) comprises: A front fixing block (61) connected to the front handlebar assembly (1); a left control assembly (62), wherein the front end of the left control assembly (62) is connected to 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 to the left handle of the rear handlebar assembly (3); A right control assembly (63), wherein the front end of the right control assembly (63) is connected to 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 to the right handle of the rear handlebar assembly (3); the rear handlebar assembly (3) drives the front handlebar assembly (1) to rotate via the left control assembly (62) and the right control assembly (63).

3. The bicycle according to claim 1, characterized in that: The rear end of the rear beam (52) is connected to a rear wheel assembly (7), and the rear wheel assembly (7) comprises: The left wheel (71) and the right wheel (72) are arranged at intervals along the left-right direction; A rear shaft sleeve (73) is connected to the rear end of the rear beam (52), a rear rotating shaft (74) is arranged in the rear shaft 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, characterized in that: The rear handlebar assembly (3) comprises: a rear inner rod (31), the lower end of the rear inner rod (31) being rotatably connected to the front beam (51); The rear outer rod (32) is sleeved outside the rear inner rod (31) and is rotatable relative to the rear inner rod (31); the front seat assembly (2) is connected to the rear outer rod (32); and the lower end of the front seat assembly (2) is detachably connected to the front beam (51).

5. The bicycle according to any one of claims 1 to 4, characterized in that: The front seat assembly (2) comprises: A front seat support rod (21), wherein the front seat support rod (21) is connected to the rear handlebar assembly (3); A front channel steel (22), the lower end of the front seat support rod (21) is connected to the front channel steel (22), and the front channel steel (22) can be plugged into the front beam (51).

6. The bicycle according to claim 1, characterized in that: The front handlebar assembly (1) comprises: A front outer rod (11), the front end of the front beam (51) being connected to the front outer rod (11); The front inner rod (12) comprises an upper rotating rod (121) and a lower rotating rod (122) which are arranged up and down and rotatably connected, and the upper rotating rod (121) can be rotated to an unfolded position arranged coaxially with the lower rotating rod (122), and can be rotated to a folded position arranged at an angle to the upper rotating rod (121), and the lower rotating rod (122) is rotatably inserted into the front outer rod (11), and the lower end of the lower rotating rod (122) is connected to the front wheel (8).

7. The bicycle according to claim 3, characterized in that: The bicycle further comprises a transmission system (9), wherein the transmission system (9) comprises: A front sprocket (91) and an intermediate sprocket assembly (92) are rotatably disposed on the beam frame (5) in the front-rear direction respectively; A front chain (93) drivingly connected to the front sprocket (91) and the intermediate sprocket set (92); A rear sprocket (94) sleeved outside the rear rotating shaft (74); A rear chain (95) is drivingly connected to the intermediate sprocket set (92) and the rear sprocket (94).

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