JP2012176638A - Foldable bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foldable bicycle in which not only area reduction but also easy accommodation can be achieved by forming a relative square cube after folding.SOLUTION: A bicycle is comprised of a carrier, tires and a transmission mechanism. The carrier includes a handle upright pipe, a front cross bar, a rear cross bar and a seat upright pipe. The handle upright pipe has a tilting cut part and has a positioning structure on the tilting cut part. The front cross bar includes a corresponding tilting cut part in one end, includes a relative amount of corresponding positioning structures on the corresponding tilting cut part and couples one end of a chain to the other end of the front cross bar. The rear cross bar couples another end to one end of the rear cross bar. The seat upright pipe is movably pivoted on the rear cross bar. Further, the seat upright pipe is positioned by a positioning rod and at the same time, a rear carrier including an assist wheel in its terminal is coupled at a place below the seat upright pipe. Thus, the carrier can be deployed or folded/accommodated through positioning or opening the positioning structures, the chain and the positioning rod, and the folded/accommodated carrier can be further moved/trailed via the assist wheel by utilizing the rear carrier for an supported/upright attitude.

Description

The present invention relates to a folding bicycle having a minimum volume after folding and storing, and more particularly to a folding bicycle applied to a casual small-wheel bicycle, a small-wheel electric bicycle, an electric motorcycle or a similar structure.

Immediately because of the development of commerce and industry, the economy has developed rapidly and the standard of living of people has improved, so various civilized progress products such as motorcycles, cars and elevators can be seen everywhere, The amount of daily activities of people is greatly reduced, but civilization diseases linked to the advancement of science and technology have disturbed modern people all the time, so many people avoid illness in front of them, and how many in their lives The number of people who ride bicycles increases day by day due to energy saving, carbon dioxide reduction, and love for the earth.

The types of bicycles are divided into competition road racers, mountain bikes riding on bumpy mountain roads, and small-diameter bicycles instead of casual walking, based on different demands. People in different positions are free to discuss, and under the spread of casual tide, when going out to a picnic in the suburbs, in order to enjoy the beautiful scenery of the forest, always take a bicycle and go together, convenient scenery Stroll around the famous sights. In the past, the four-wheel + two-wheel (four-wheel-two-wheel) method generally adds a cycle carrier on top of the car, and further ties the bicycle on the roof or rear trunk of the vehicle. However, if it is not tightly engaged when tied, the bicycle may generate an impact on the car body due to vibration during driving, and lightness will cause damage to the car body. Severely, the lashing of the tether can cause the bicycle to fall and pose a driving hazard.

Folding bicycles are therefore widespread and widespread, reducing the volume of the bicycle through folding of the chassis, allowing the bicycle to be left in the car, and reducing the risk of falling. However, the folding bicycle can be folded to achieve the area reduction effect. However, as shown in FIG. 1, in the known folding bicycle, a folding device a is mainly provided on the cross bar of the chassis, and when folding, the folding chassis a is twisted so that the front chassis is folded. This method can reduce the length of the chassis by rotating backwards around a and overlapping with the rear chassis. However, even if it has an irregular shape and a support column for ground support is provided on the chassis, the folded chassis cannot be supported, and the folded chassis must be leaned against the wall or left on the ground. In order to move the chassis after it has been folded in an even more difficult manner, it is necessary to carry it directly by human power, and the front and rear chassis after being folded in other ways have no positioning effect Therefore, it is difficult to hold and apply force during transportation.

Therefore, in view of the above-mentioned drawbacks, the present inventor can reduce the volume after folding and use the rear loading platform as a support, serve upright and contribute to storage, or when operating through the tire and auxiliary wheels. In order to expect to be able to provide a folding bicycle that is easy to tow, it is designed and assembled by earnestly researching and thinking, and provided to the use of mass consumption, which is the creative actuator that this invention intends to research and create It is.

The main object of the present invention is to form a relatively square cube after folding, and not only to reduce the area but also to provide a folding bicycle that is easy to store.

The next object of the present invention is to use the rear carrier as a support after folding, and to serve upright, and through the assistance of the auxiliary wheels of the rear carrier, without consuming a large amount of force, still contributing to traction and movement. To provide a folding bicycle.

It is a further object of the present invention to provide a folding bicycle in which the front and rear chassis have an engaging and positioning effect after folding.

In order to achieve the above object, the folding bicycle of the present invention includes a chassis, a tire, and a transmission mechanism, and the chassis has an inclined cut portion and at least one positioning on the inclined cut portion. One handle / stand pipe provided with a structure, a corresponding inclined cut portion provided at one end and a corresponding positioning structure of a relative quantity on the corresponding inclined cut portion, and one end coupled to one side of the chain at the other end Including a front cross bar, one rear cross bar that joins the other side of the chain to one end, and a seat and standing pipe that is movably supported on the rear cross bar, The seat / stand pipe is positioned by one positioning rod.

The folding bicycle provided by the present invention further has the following advantages as compared with the prior art.

(1) The chassis is accommodated and folded through the positioning structure, the chain and the opening of the positioning rod in a tri-folded upright manner with the smallest chassis and the smallest space through the structure.

(2) The small vertical auxiliary wheel provided on the rear carrier on the rear cross bar makes it easier to move the chassis after folding.

It is a schematic diagram of the folding state of the conventional folding bicycle. 1 is a perspective external view of an embodiment of the present invention. It is a schematic diagram of the folding state of the Example of this invention, and displays the operation | movement of a chain. FIG. 3 is an enlarged schematic diagram of an I portion of FIG. 2, in which different angles are displayed between a handle / standing pipe inclined cut portion and a corresponding inclined cut portion of a front cross bar. FIG. 3 is an enlarged schematic diagram of an I portion of FIG. 2, in which different angles are displayed between a handle / standing pipe inclined cut portion and a corresponding inclined cut portion of a front cross bar. FIG. 3 is an enlarged schematic view of element isolation in the I part of FIG. 2, and displays one or more sets of positioning holes provided on the stretched piece. It is a figure of the 2nd application example of the positioning structure of this invention. It is a schematic diagram of the folded state of the Example of this invention. It is a schematic diagram of the folded state of the Example of this invention. FIG. 6B is an enlarged schematic view of the portion III in FIG. 6A, showing that the vertical insertion block at the bottom of the rear fork of the rear cross bar is engaged with the horizontal slot at the bottom of the front fork of the handle / stand pipe. . FIG. 6B is an enlarged schematic diagram of the IV part in FIG. 6A, and displays the operation of incorporating the telescopic rod at the end of the front cross bar. FIG. 6B is an enlarged schematic view of the portion III in FIG. 6A, showing that the vertical insertion block at the bottom of the rear fork of the rear cross bar is engaged with the horizontal slot at the bottom of the front fork of the handle / stand pipe. . FIG. 6 is an enlarged schematic view of a portion II in FIG. 5 that displays a fitting of a positioning rod or a separation operation of a second positioning portion. FIG. 6 is an enlarged schematic view of a portion II in FIG. 5 that displays a fitting of a positioning rod or a separation operation of a second positioning portion. FIG. 3 is a diagram illustrating a state in which the embodiment of the present invention is folded and stored and completed.

FIG. 2 is a perspective external view of an embodiment of the present invention. As shown in the figure, the folding bicycle 1 of the present invention includes a chassis, a transmission mechanism and tires. The chassis includes a handle / stand pipe 11, a front cross bar 13, a chain 15, a rear cross bar 17 and a seat / stand pipe 19. A front fork 111 of a shaft-attached tire is continuously provided below the handle / stand pipe 11, and a set of horizontal slots 119 is provided at one end of the front fork 111, and an inner surface of the horizontal slot 119 is provided. Is provided so as to be an elastic piece having a protruding fitting portion. One T-type handle 112 is provided above, and at least one presser fastener 1123 is provided on the T-type handle 112. At the same time, refer to FIG. FIG. 8 is a view showing a state of folding and storing and completing according to the embodiment of the present invention. As shown in FIG. 8, the handle 1121 on the side is formed into a T shape by using one pivot shaft 1122 at the lower edge portion of the end. The handle 112 is pivotally supported, and one presser fastener 1123 is provided at the upper edge portion of the proximal end portion of the handle 1121.

Further, by providing the corresponding engaging portion 1124 of the pressing fastener 1123 at the relative side portion of the T-shaped handle 112, the handle 1121 is conveniently engaged so as to become a horizontal handle, or the bent shape is presented downward. Thus, the length of the handle is reduced, and an inclined cut portion 113 installed obliquely is provided in the vertical direction at an appropriate location above the front fork 111, and the inclined cut portion 113 is provided on the inclined cut portion 113. A positioning structure 114 that penetrates the portion 113 and fits a spring is provided, and the positioning structure 114 is either a screw or a retaining pin, and the screw 114a is described as an example with reference to FIGS. 4C and 4D. The handle / standing pipe 11 has one shaft hole at the end edge portion of the inclined cut portion 113, and in addition, one extended piece 1131 protrudes in the horizontal direction of the bottom edge of the inclined cut portion 113, A positioning hole 1132 is provided on 1131, and one or more positioning holes 1132 are set.

This embodiment is set to one, and returning to FIG. 2, as a result, the handle / stand pipe 11 movably mounts one positioning engagement piece 116 at the middle position, and at the same time on the positioning engagement piece 116 And a gripping portion 117 that contributes to the gripping portion. A corresponding inclined cut portion 131 is provided at one end of the front cross bar 13. Then, a corresponding positioning structure 132 is provided at a corresponding position in the cut surface of the corresponding inclined cut portion 131, and the corresponding positioning structure 132 is embedded in advance with a nut 132b so as to correspond to the screw 114a of the positioning structure 114. A relative quantity of telescopic rods 1351 corresponding to the quantity of positioning holes 1132 above the extended piece 1131 is provided in the cut portion 131.

The chain 15 is connected to the ends of the front cross bar 13 and the rear cross bar 17 by welding the two chain side plates 151 and 152, respectively, by an upright system with the open end up and the shaft-attached end down. The chain side plate 151 is provided with one presser fastener 153 and one corresponding fitting tank at the top edge portion of the chain side plate 151, and one corresponding fitting at the top edge portion of the other chain side plate 152. A combined tank and a movable fastener 154 are provided. As a result, when the two chain side plates 151 and 152 are pasted, the movable fastener 154 stops the corresponding fitting tank with respect to the chain side plate 151, and the presser fastener 153 uses the presser rod to cope with the chain side plate 152. Engage with the mating tub.

One end of the rear cross bar 17 and the chain side plate 152 of the chain 15 are joined by welding, and a pedal 16 and a transmission mechanism 165 that can be provided for bending are provided at the front and middle stages of the rear cross bar 17, and the rear -Connect one end of the handgrip 172 onto the rod body of the cross bar 17. At the same time, it is connected to the rear end of the rear cross bar 17 and the rear fork for axially attaching the tire, and the rear cross bar 17 is attached to the corresponding positioning fastener 171 at one side where the pedal 16 is axially attached. One projecting.

In addition, one vertical insertion block 173 is connected to one side of the rear fork of the rear cross bar 17, and a thrust plate 1741 (similarly shown in FIG. 6B), and the thrust plate 1741 is controlled by one presser rod 174. In addition, a vertical insertion block 173 on the rear fork and a horizontal slot 119 on the bottom edge of the front fork 111 are installed in different directions with a 90 ° angle difference, inside the rod holder 191 below the seat / stand pipe 19 A first positioning portion 193 is provided at the location.

The seat standing pipe 19 is designed to be a rod body that can be moved and expanded, and is movably mounted on a single rod holder 191 so that the rod holder 191 has a certain angle. The rod holder 191 is coupled to the rear cross bar 17, and the rear fork of the rear cross bar 17 is coupled to the other end of the hand grip 172. Then, the rod holder 191 joins one rear loading platform 195 at an upper position so that the rear loading platform 195 is suspended on the rear wheel, and the end of the rear loading platform 195 is at least one movable auxiliary wheel 196 ′. Join. In this embodiment, one movable auxiliary wheel 196 is coupled upward and vertically on both sides of the rear end. In addition, a second positioning part 194 is projected from the front edge of the rear loading platform 195 and the portion where the seat / stand pipe 19 forms a straight line, and the movable auxiliary wheel 196 is connected to the rear fork of the rear cross bar 17. The two support rods 197 are coupled downward.

FIG. 3 is a schematic view of the folded state of the embodiment of the present invention, showing the operation of the chain, and FIGS. 4A and 4B are enlarged schematic views of the I portion of FIG. Different angles between the angled cuts of the handle and vertical pipe and the corresponding angled cuts of the front cross bar are displayed. FIG. 4C is an enlarged schematic diagram of element isolation in the I portion of FIG. 2 and displays one or more sets of positioning holes provided on the stretched piece. FIG. 4D is a diagram of a second application example of the positioning structure of the present invention. At the same time, as shown in FIGS. 3, 4A, 4B, and 4C, when the bicycle is to be folded and stored, the positioning structure 114 is first opened, the control bar 135 is twisted upward, and the inclined cut 113 The corresponding inclined cut portion 131 is movable, further opens the presser fastener 153 and presses the movable fastener 154 synchronously. At this time, there are two application points. One of them applies a backward force to the seat / stand pipe 19 or a lifting force to the handgrip 172, both of which chain the front cross bar 13 and the rear cross bar 17 together. 15 can be combined. Then, the horizontal position is changed to the vertical position, and on the one hand, the rear loading platform 195 is perpendicular to the ground, or the two auxiliary wheels are in contact with the ground, and on the other hand, the handle / stand pipe 11 is the extension part. The handle / stand pipe 11 is moved backward so as to be parallel to the rear cross bar 17 through 133 movable shafts. Then, when the rear cross bar 17 stands upright, the original vertical insertion block 173 changes to a horizontal insertion block. Therefore, when the handle / stand pipe 11 overlaps the rear cross bar 17, the horizontal slot 119 provided on one side of the front fork 111 is inserted into the vertical insertion block 173 on one side of the rear fork.

5 and 6A are schematic views of the folded state of the embodiment of the present invention, FIG. 6B is an enlarged schematic view of the III portion of FIG. 6A, and the vertical insertion block at the rear fork bottom portion of the rear cross bar is attached to the handle. Engage in the horizontal slot at the bottom of the front fork of the vertical pipe. FIG. 6C is an enlarged schematic diagram of the IV portion of FIG. 6A, and displays the operation of incorporating the telescopic rod at the end of the front cross bar. At the same time, as shown in FIG. 5, FIG. 6A, FIG. 6B, FIG. 6C and FIG. 6D, the two tires overlap each other in a positioning shape, and the positioning engagement piece 116 on the handle / stand pipe 11 is attached to the rear cross. The bar 17 engages a corresponding positioning fastener 171 (not shown, see FIG. 3), so that the handle / stand pipe 11 and the rear cross bar 17 have two upper and lower engaging positioning points.

FIG. 6C is an enlarged schematic diagram of the IV portion of FIG. 6A and displays the operation of incorporating the telescopic rod at the end of the front cross bar. As shown in the figure, the telescopic rod 1351 of this embodiment is set to one, the front cross bar 13 is one control bar 135 for controlling the forward and backward movement of the telescopic rod 1351 above the telescopic rod. Provide. In addition, the front cross bar 13 is provided with one extending portion 133 at the side of the telescopic rod, and using one shaft rod, the extending portion 133 is attached to the shaft hole of the handle / standing pipe 11, The handle / stand pipe 11 and the front cross bar 13 are formed to be movably mounted on the shaft.

The chain 15 is connected to the ends of the front cross bar 13 and the rear cross bar 17 by welding the two chain side plates 151 and 152, respectively, by an upright system with the open end at the top and the shaft end at the bottom. The chain side plate 151 is provided with one presser fastener 153 and one corresponding fitting tank at the top edge portion of the chain side plate 151, and one corresponding to the top edge portion of the other chain side plate 152. A fitting tank and a movable fastener 154 are provided. As a result, when the two chain side plates 151 and 152 are pasted, the movable fastener 154 stops the corresponding fitting tank with respect to the chain side plate 151, and the presser fastener 153 uses the presser rod to cope with the chain side plate 152. Engage with the mating tub.

One end of the rear cross bar 17 and the chain side plate 152 of the chain 15 are joined by welding, and a pedal 16 and a transmission mechanism 165 that can be provided for bending are provided at the front middle stage of the rear cross bar 17, and One end of the handgrip 172 is joined to the rod body of the rear cross bar 17. At the same time, it is connected to the rear end of the rear cross bar 17 and the rear fork for axially attaching the tire, and the rear cross bar 17 is attached to the corresponding positioning fastener 171 at one side where the pedal 16 is axially attached. One projecting. In addition, one vertical insertion block 173 is connected to one side of the rear fork of the rear cross bar 17, and a thrust plate 1741 (similarly shown in FIG. 6B), the thrust plate 1741 is controlled by one presser rod 174, and the vertical insertion block 173 of the rear fork and the horizontal slot 119 at the bottom edge of the front fork 111 are 90 degrees apart. Installed in different directions.

The seat standpipe 19 is designed to be a rod body that can be expanded and contracted movably, and is movably mounted on a single rod holder 191 so that the rod holder 191 has a certain angle. And the rear cross bar 17 (see FIG. 7A at the same time), and the rod holder 191 connects the rear fork of the rear cross bar 17 and the other end of the handgrip 172. Then, the rod holder 191 joins one rear loading platform 195 at an upper position so that the rear loading platform 195 is suspended on the rear wheel, and the end of the rear loading platform 195 is at least one movable auxiliary wheel 196 ′. Are combined (see FIG. 5). In this embodiment, one movable auxiliary wheel 196 is connected to both sides of the rear end upward and vertically, and two support rods 197 connected to the rear fork of the rear cross bar 17 are connected downward. As a result, one positioning rod 192 is provided on the periphery of the seat / stand pipe 19, and a first positioning portion 193 is provided in the rod holder 191 at a position below the seat / stand pipe 19. Then, the second positioning portion 194 is projected from the front end edge of the rear loading platform 195 and the portion where the seat / standing pipe 19 exhibits a straight line.

In addition, FIG. 7A and FIG. 7B are referred. A lifting force is applied to the positioning rod 192, the positioning rod 192 comes out of the first positioning portion 193 (see also FIG. 2), and the sheet is moved until the positioning rod 192 engages with the second positioning portion 194. The vertical pipe 19 rotates toward the position of the chain 15 and the rod holder 191 is coupled with the rear cross bar 17 at an angle. Therefore, when the seat / stand pipe 19 shifts the rear cross bar 17 according to the set angle and simultaneously presses the presser fastener 1123 on the handle 1121, the presser fastener 1123 comes out of the corresponding engaging portion 1124, and the handle 1121 can be folded downward. Further, the two pedals 16 can also be folded and stored through the presser, achieving the purpose of storage and merger, and the folded bicycle has a relatively square volume that is convenient for storage as shown in FIG. And can stand upright without leaning against the wall, and at the same time, the front and rear wheels and auxiliary wheels 196 and 196 ′ slide (see FIG. 5) contributes more to the traveler.

Returning to FIG. 4D, the second application example of the positioning structure of the present invention is a panel body in which the positioning structure 114 that penetrates the inclined cut portion 113 and is fitted with a spring is provided with two stop pins 114b on the bottom. In addition, the corresponding positioning structure 132 on the corresponding inclined cut portion 131 of the front cross bar 13 is provided to be two pin holes 132b used for fitting of the two locking pins 114b, and the two locking pins 114b and the pins The positioning effect of the positioning structure 114 becomes firmer through the fitting with the hole 132b.

However, the above description is only a more preferred embodiment of the present invention, and of course should not be used to limit the scope of implementation of the present invention. It should be considered that neither changes nor hydration that can be made depart from the substantial contents of the present invention.

Combining the above, the present invention can surely achieve the expected purpose of creation, and the chassis can be deployed through the positioning or opening of the set screw, chain and positioning rod, or in an upright manner that is the smallest and takes up the least space It is possible to provide a folding bicycle that can be folded and stored in such a way that it can be easily moved after being folded by a small vertical auxiliary wheel provided on the rear carrier on the rear cross bar. It has practical value, so the patent application of the present invention is filed by the patent law.

a: Folding device, 1: Folding bicycle, 11: Handle / standing pipe, 13: Front cross bar, 15: Chain, 16: Pedal, 17: Rear cross bar, 19: Seat standing pipe, 111: Front Hawk, 112: T-shaped handle, 113: Inclined cut part, 114: Positioning structure, 114a: Screw, 114b: Stop pin, 115: Attached part, 116: Positioning engagement piece, 117: Gripping part, 118: Positioning clip 119: Horizontal slot, 131: Corresponding inclined cutting part, 132: Corresponding positioning structure (screw hole), 132b: Pin hole, 133: Extension part, 134: Extension piece, 135: Control bar, 151: Chain side plate, 152: Chain side plate, 153: Presser fastener, 154: Movable fastener, 171: Corresponding positioning fastener, 172: Hand grip, 173: Vertical insertion block, 174: Presser rod, 191: Rod holder, 192: Positioning rod, 193: First place Deciding part, 194: second positioning part, 195: rear loading platform, 196: auxiliary wheel, 196 ': auxiliary wheel, 197: support rod, 198: bumper, 1121: handle, 1122: pivot shaft, 1123: presser fastener , 1124: Corresponding engagement part, 1341: Positioning hole.

Claims (13)

A folding bicycle comprising a chassis, a tire, and a transmission mechanism,
The chassis includes one handle / stand pipe, one front cross bar, one rear cross bar and one seat / stand pipe, and the handle / stand pipe is located above the front fork on which the tire is pivoted. One pivot point and one inclined cut at the edge are projected obliquely, and at least one positioning structure is provided on the inclined cut, and the front cross bar has a corresponding inclined cut at one end. A shaft mounting portion is provided on the side of the corresponding inclined cut portion, and is pivotally attached to each other by the shaft rod and the shaft mounting portion of the handle / standing pipe, and on the corresponding inclined cut portion. A corresponding positioning structure is provided, the rear cross bar is provided with a transmission mechanism and a rear fork, the rear fork is provided for tire shaft attachment, and the rear cross bar is not provided with the tire at the end thereof. Combine one side of the chain and the other side of the chain Combined with the end of the front cross bar that does not have a corresponding inclined cut, the seat / stand pipe is pivotally supported at the upper edge of the rear cross bar's rear fork, and one other positioning Position the seat and standing pipe with the rod, and therefore apply the lifting force to the rear cross bar through the opening of the positioning rod structure, and move and rotate the front cross bar with the chain and the shaft attachment part. The handle / stand pipe is moved backwards and overlapped with the rear cross bar. At the same time, the seat / stand pipe can be folded and stored by positioning or releasing the positioning rod, and the chassis can be expanded. The folding bicycle can be folded and stored in an upright state that is the smallest and occupies the least space. The slanted cut of the handle / standing pipe has one extending piece protruding from the bottom edge to the front edge, and one or more positioning holes are provided on the extending piece, and the corresponding inclination of the front cross bar The telescopic rod having the same number of the positioning holes as the number of the positioning holes is provided vertically in the cut portion, and the telescopic rod is controlled by a control bar outside the corresponding inclined cut portion. 1. The folding bicycle according to 1. The folding bicycle according to claim 1, wherein the positioning structure on the inclined cut portion of the handle / standing pipe is a positioning screw or a positioning stop pin for providing a spring. The middle stage portion of the handle / standing pipe is pivotally attached with at least one positioning engagement piece, and a corresponding positioning engagement piece is provided at a relative position of the rear cross bar. Folding bike. The folding bicycle according to claim 4, wherein a gripping portion that contributes to gripping of the hand portion is provided on at least one positioning engagement piece. 2. The folding bicycle according to claim 1, wherein the T-shaped handle provided above the handle and the standing pipe has at least one pivot pressing fastener that may be used for bending the handle. The folding bicycle according to claim 1, wherein the chain takes an upright manner with an opening facing upward, and is joined to ends of the front cross bar and the rear cross bar by welding. The folding bicycle according to claim 1, wherein the chain for connecting the front cross bar and the rear cross bar is provided with at least one connecting fastener on both sides of the opening. At least one coupling fastener includes one movable fastener and one presser fastener having a degree of looseness adjustment, the movable fastener and the presser fastener being respectively left on the opposite side of the chain. The folding bicycle according to claim 8. A set of horizontal slots is connected to the bottom of one side of the front fork of the handle / standing pipe, and there is one locking block and one retaining edge inside and in front of the set horizontal slots. , At least one vertical insertion block and an elastic pressing piece are coupled to the bottom of one side of the rear fork of the rear cross bar, and one locking concave tank is provided at a corresponding position in front of the insertion block, The folding bicycle according to claim 1, wherein the elastic pressing piece further extends one presser rod backward. The seat / stand pipe supports the rear cross bar with a single tilt angle, and the rear cross bar supports the seat / stand pipe at both the horizontal and vertical positions. The folding bicycle according to claim 1, further comprising a first positioning portion and a second positioning portion for use in positioning. The position of the second positioning part of the rear cross bar is characterized in that the rear cargo bed is extended by one and at least one small vertical auxiliary wheel is coupled to the end of the rear cargo bed. Folding bicycle as described. The position of the second positioning portion of the rear cross bar is formed by extending one rear cargo bed and connecting one small vertical auxiliary wheel to each end of the rear cargo bed. Folding bicycle as described.