Foldable bicycle into a handcart

Abstract

The invention discloses a bicycle foldable into a hand-pulled cart, comprising a front wheel, a front fork assembly, a bicycle steering handle, a "I"-shaped beam, a pedal assembly, a pulley block type chain clutch assembly with speed-up and clutch functions, a seat, a seat bracket, a rear wheel and a bicycle flywheel, wherein the pedal assembly comprises a pedal, a pedal connecting rod, a rotating shaft and a rotating spring; the pulley block type chain clutch assembly comprises a movable pulley sleeve, a bicycle chain, a chain return spring, a movable pulley return spring, a chain positioning wheel and a movable pulley; the pedal connecting rod is connected to one end of the movable pulley sleeve through a flexible steel rope, a bicycle chain is arranged between the movable pulley sleeve and the movable pulley, one end of the bicycle chain is fixed on the seat bracket, the other end passes through the movable pulley sleeve and is connected to the chain return spring, and is tightened and positioned under the bicycle flywheel through the chain positioning wheel. The invention can be ridden or dragged, and can be used as a docking and transportation tool between buses, subways and destinations, which is economical and not cumbersome.

Description

1. Technical field:

[0002] The present invention relates to a bicycle, in particular to a bicycle that can be folded into a hand-pulled cart, and belongs to the technical field of transportation tools. 2. Background technology:

[0004] The invention patent numbered ZL2015 2 1024694.9 owned by the applicant provides an electric vehicle that can be folded into a hand-pulled cart. When folded, it is an "L"-shaped hand-pulled cart commonly used by people for shopping, and when unfolded, it is a lightweight electric vehicle that can be conveniently used by adults. However, in practice, the following disadvantages are found: 1. Under the existing technical conditions, it is somewhat difficult to achieve the ideal weight of the motor and battery of this product; 2. As a mobile and fast means of transportation, many places do not allow small-wheeled electric vehicles to go on the streets for safety reasons, so the market prospect of this product as a means of transportation is not optimistic at present.

[0005] The applicant envisions changing the patent number ZL2015 2 1024694.9 "Electric vehicle foldable into a hand-pulled cart" to "Bicycle foldable into a hand-pulled cart", that is, according to the method of the patent "ZL2015 2 1024694.9", when folded, it is an "L"-shaped hand-pulled cart, and when unfolded, it is a lightweight bicycle that can be conveniently used by adults. The technical problems arising from this are: 1. The bicycle must be equipped with a clutch device so that when it is folded into an "L"-shaped hand-pulled cart, the wheels can rotate back and forth, and when it is unfolded, it is a lightweight bicycle that can be conveniently used by adults, and the wheels can only rotate unidirectionally with the bicycle flywheel; 2. Since the main beam of the bicycle is lower to the ground at this time, it is no longer possible to drive the bicycle by the traditional method of using a large gear to drive the flywheel to increase the transmission ratio, and another method must be found. 3. Summary of the invention:

[0007] The technical problem to be solved by the present invention is to provide a bicycle which can be folded into a hand-pulled cart, which is light and durable, can be safely driven on the road, can be ridden or dragged, is not in the way, can be used to carry things into supermarkets and shopping malls, can be used as a means of transportation between buses, subways and destinations, and is economical, practical and not cumbersome.

[0008] The technical solution adopted by the present invention to solve the technical problem is:

[0009] A bicycle foldable into a hand-pulled cart comprises a front wheel, a front fork assembly, a bicycle steering handle, an I-shaped beam, a pedal assembly, a pulley block type chain clutch assembly with speed-up and clutch functions, a seat, a seat bracket, a rear wheel and a bicycle flywheel, wherein the pedal assembly comprises a pedal, a pedal connecting rod, a rotating shaft and a rotating spring, wherein the rotating spring is sleeved on the rotating shaft, and the rotating shaft is connected to the middle and rear part of the I-shaped beam; the pulley block type chain clutch assembly with speed-up and clutch functions is The clutch assembly comprises a movable pulley sleeve, a bicycle chain, a chain return spring, a movable pulley return spring, a chain positioning wheel and a movable pulley; the upper middle portion of the pedal connecting rod is connected to one end of the movable pulley sleeve through a flexible steel rope, the bicycle chain is arranged in the gap between the movable pulley sleeve and the movable pulley, one end of the bicycle chain is fixed to the seat bracket, the other end passes through the movable pulley sleeve and is connected to the chain return spring, and is tightened and positioned below the bicycle flywheel through the chain positioning wheel.

[0010] The front end and the middle and rear end of the "I"-shaped beam are provided with two groups of three-plate two-axis hinges.

[0011] When the present invention is folded and used as a handcart, the pedal assembly is not stressed, and the movable pulley connected to the pedal assembly through the flexible steel rope is also not stressed, so that the bicycle chain cannot touch the "flywheel". At this time, the so-called clutch device is in the off state, and the wheel can rotate freely forward and backward.

[0012] When the present invention is unfolded and used as a bicycle, people step on the pedals, and the flexible steel rope of the pedal assembly pulls one end of the movable pulley sleeve, thereby driving the bicycle chain and pressing it against the flywheel. This is the so-called closed state of the clutch device. At this time, as the chain rotates, the wheel also rotates forward.

[0013] When the present invention is unfolded and used as a bicycle, when people step on the pedals, the pulley embedded in the sleeve pulled by the flexible steel rope moves together with the steel rope, becoming a movable pulley in mechanics, which is a deformed unequal-arm lever. Since one end of the bicycle chain is fixed above the rear bracket of the bicycle, according to the movable pulley principle, in this case, the distance moved by the end of the compressed flywheel is twice the distance moved by the steel rope (if a pulley block with two movable pulleys is used, the situation is different and can also be three times). Since the beam of the present invention is relatively low, the arc track size of the pedal when exerting force can only be half of that of an ordinary bicycle. By using this feature of the movable pulley mechanism to compensate for the arc track size of the pedal mentioned above, its riding speed can be the same as that of an ordinary bicycle, and it will be more labor-saving.

[0014] The positive beneficial effects of the present invention are as follows:

[0015] 1. Compared with the electric vehicle foldable into a hand-pulled cart, the electric vehicle of the present invention is much lighter and can be safely driven on the road. It can be ridden or dragged, and does not get in the way. You can bring things into supermarkets and shopping malls. It can be used as a transportation tool between buses, subways and destinations, and is economical, practical and not cumbersome.

[0016] 2. Compared with ordinary bicycles, the center of gravity of the present invention is about ten centimeters lower. When riding, the left foot strokes the ground like a scooter to give an initial speed, and the right foot pushes the pedal with a return spring to rush out. In this way, the speed will increase after a few strokes of left and right pedaling, and it is convenient to start. To stop, you can stand by squeezing the brake handle and touching the ground with your feet, without moving your buttocks. The speed is very stable, which is particularly suitable for the elderly to use when walking for exercise. Riding a bicycle is much better for the maintenance of the knee joints of the elderly than walking, but ordinary bicycles are unstable and unsafe at slow speeds, so fewer elderly people ride bicycles. The present invention overcomes the disadvantage that ordinary bicycles are difficult to control at slow speeds. It is not only a good helper for the elderly to go out for a stroll, but also a good tool for physical exercise. It is economical and applicable, and has great practical and economic value after promotion. 4. Description of the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the present invention when it is unfolded and used as a riding bicycle;

[0019] Figure 2 This is a schematic diagram of the structure of the present invention when it is folded and used as a hand-pulled trolley;

[0020] Figure 3 It is a structural schematic diagram of the pedal assembly and the pulley block type chain clutch assembly of the present invention when the pedal is not subjected to force and the clutch device is in a disengaged state;

[0021] Figure 4 It is a structural schematic diagram of the pedal assembly and the pulley block type chain clutch assembly of the present invention when the pedal is subjected to force and the clutch device is in a disengaged state and the force is combined. V. Specific implementation methods:

[0023] The invention will be further explained and illustrated below in conjunction with the accompanying drawings and specific embodiments:

[0024] See also Figure 1 , Figure 2 , Figure 3 and Figure 4, the numbers in the figure are as follows: 1---front wheel, 2---front fork assembly, 3---bicycle steering handle, 4---"I"-shaped beam, 5---pedal assembly, 6---pulley chain clutch assembly with acceleration and clutch functions, 7---seat, 8---seat bracket, 9---rear wheel, 10---pedal, 11---pedal connecting rod, 12---rotating shaft, 13---rotating spring, 14---flexible steel rope, 15---movable pulley sleeve, 16---bicycle chain, 17---chain return spring, 18---movable pulley return spring, 19---chain positioning wheel, 20---bicycle flywheel, 21---movable pulley, 22---three-plate two-axis hinge.

[0025] Embodiment: A bicycle foldable into a hand-pulled cart, comprising a front wheel 1, a front fork assembly 2, a bicycle steering handle 3, a "I"-shaped beam 4, a pedal assembly 5, a pulley block type chain clutch assembly 6 with acceleration and clutch functions, a seat 7, a seat bracket 8, a rear wheel 9 and a bicycle flywheel 20, wherein: the pedal assembly 5 comprises a pedal 10, a pedal connecting rod 11, a rotating shaft 12 and a rotating spring 13, the rotating spring 13 is sleeved on the rotating shaft 12, and the rotating shaft 12 is connected to the middle and rear position of the "I"-shaped beam 4; the pulley block type chain clutch assembly with acceleration and clutch functions The clutch assembly 6 includes a movable pulley sleeve 15, a bicycle chain 16, a chain return spring 17, a movable pulley return spring 18, a chain positioning wheel 19 and a movable pulley 21; the upper and middle part of the pedal connecting rod 11 is connected to one end of the movable pulley sleeve 15 through a flexible steel rope 14, and a bicycle chain 16 is arranged in the gap between the movable pulley sleeve 15 and the movable pulley 21, one end of the bicycle chain 16 is fixed to the seat bracket 8, and the other end passes through the movable pulley sleeve 15 and is connected to the chain return spring 17, and is tightened and positioned below the bicycle flywheel 20 through the chain positioning wheel 19.

[0026] Two groups of three-plate two-axis hinges 22 are arranged at the front end and the middle and rear end of the "I"-shaped beam 4.

[0027] The structures not described in detail in the present invention are all prior art.

[0028] When the present invention is folded and used as a handcart, the pedal assembly is not stressed, and the movable pulley 21 connected thereto by the flexible steel rope 14 is also not stressed, so that the bicycle chain 16 cannot touch the "flywheel", which is the so-called clutch device off state, and the rear wheel 9 can rotate freely forward and backward.

[0029] When the present invention is unfolded and used as a bicycle, people step on the pedals, and the flexible steel rope of the pedal assembly pulls one end of the movable pulley sleeve, thereby driving the bicycle chain and pressing it against the flywheel. At this time, the so-called clutch device is in the closed state. At this time, as the bicycle chain 16 rotates, the rear wheel 9 also rotates forward.

[0030] When the present invention is unfolded and used as a bicycle, when people step on the pedals, the pulley embedded in the sleeve pulled by the flexible steel rope moves together with the steel rope, becoming a movable pulley in mechanics, which is a deformed unequal-arm lever. Since one end of the bicycle chain is fixed above the rear bracket of the bicycle, according to the movable pulley principle, in this case, the distance moved by the end of the compressed flywheel is twice the distance moved by the steel rope (if a pulley block with two movable pulleys is used, the situation is different and can also be three times). Since the beam of the present invention is relatively low, the arc track size of the pedal when exerting force can only be half of that of an ordinary bicycle. By using this feature of the movable pulley mechanism to compensate for the arc track size of the pedal mentioned above, its riding speed can be the same as that of an ordinary bicycle, and it will be more labor-saving.

[0031] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A bicycle foldable into a hand-pulled cart, comprising a front wheel (1), a front fork assembly (2), a bicycle handlebar (3), an I-shaped beam (4), a pedal assembly (5), a pulley chain clutch assembly (6) with acceleration and clutch functions, a seat (7), a seat bracket (8), a rear wheel (9) and a bicycle flywheel (20), Features: The pulley block type chain clutch assembly (6) with speed-up and clutch functions comprises a movable pulley sleeve (15), a bicycle chain (16), a chain return spring (17), a movable pulley return spring (18), a chain positioning wheel (19) and a movable pulley (21); the pedal assembly (5) comprises a pedal (10), a pedal connecting rod (11), a rotating shaft (12) and a rotating spring (13); the rotating spring (13) is sleeved on the rotating shaft (12); the rotating shaft (12) is connected to the middle and rear part of the "I"-shaped beam (4); The upper middle portion of the pedal connecting rod (11) is connected to one end of the movable pulley sleeve (15) via a flexible steel rope (14); the bicycle chain (16) is arranged in the gap between the movable pulley sleeve (15) and the movable pulley (21); one end of the bicycle chain (16) is fixed to the seat bracket (8); the other end passes through the movable pulley sleeve (15) and is connected to the chain return spring (17), and is tightened and positioned below the bicycle flywheel (20) via the chain positioning wheel (19); the front fork assembly (2) has an arc structure; When folded and used as a handcart, the pedal assembly (5) is not subjected to stress, the movable pulley (21) connected thereto via the flexible steel rope (14) is also not subjected to stress, the bicycle chain (16) is away from the bicycle flywheel (20), and the rear wheel (9) rotates freely forward and backward; When the bicycle is unfolded and used as a bicycle, the flexible steel rope (14) of the pedal assembly pulls one end of the pulley sleeve (15), driving the bicycle chain (16) and pressing it against the bicycle flywheel (20). As the bicycle chain (16) rotates, the rear wheel (9) also rotates forward.

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