KR100959806B1 - Urban portable bicycle - Google Patents

Abstract

PURPOSE: A portable bicycle for city life is provided to minimize inconvenience to others and enable a user to easily carry the bicycle during the use of public transportation by reducing the gap between the nose wheel and the rear wheel of a bicycle. CONSTITUTION: A portable bicycle for city life comprises a vertical frame(20), a horizontal frame(30), and a lifting unit(40). A saddle is mounted on the upper part of the vertical frame and a rear wheel is mounted on the lower part. The vertical frame is composed of one vertical frame and the other vertical frame which are separated at a fixed interval. A handlebar is mounted on the upper part of the horizontal frame and a nose wheel is mounted on the lower part. The horizontal frame passes through the inside of a separate space of the vertical frame. The lifting unit enables a drive shaft of the wheel of a driving chain sprocket to elevate along a guide groove which is vertically inclined on the vertical frame.

Description

Urban portable bicycle {Urban portable bicycle}

The present invention has a handlebar folding device to effectively reduce the bicycle to add steering convenience and to be useful for public transportation, and the vertical frame composed of one side and the other side of the plate and the teeth are formed to facilitate the expansion It has a horizontal frame equipped with an adjusting groove and a roller guide groove, and a lifting device of a driving chain sprocket wheel, which can be adjusted to fit the rack and the driver's body, and includes a pedal crank separating device to reduce the size of the bicycle. Afterwards, it is about a city-type portable bicycle to pursue more convenience of movement.

The bicycle is a useful tool not only as a fitness device for health in modern life but also as a short-distance vehicle. Recently, as a part of the green growth, the social atmosphere to increase the use of the bicycle has been spreading. Attention is focused.

However, in general, there are very limited ways to carry a bicycle in public transportation so that you can ride it where you want.

For example, a bicycle was manufactured by folding a bicycle to reduce its volume and inserting it into a trunk, or by reducing a bicycle's wheel to reduce its volume. However, most bicycles of this type have a smaller wheel diameter or a smaller bicycle body. Even in the small protrusions, the driver has a large degree of impact, a slow moving speed, and a small size makes the driver feel uncomfortable.

In addition, there is a folding-type bicycle that can fold the bike in half through the hinge means, which is inconvenient, such as the volume after folding in half is very large, can not be moved by rolling the wheel of the bike to move when moving. Therefore, there is a problem that it is difficult to move the bicycle using public transportation easily.

The present invention has been made to solve the above problems of the prior art, by using a handlebar folding device to be able to fold one side and the other steering handle of the bicycle at an angle of 90 degrees, using the lifting device of the pedal crankshaft of the bicycle A city-type portable bicycle that escapes the pedal crankshaft to the upper side and slides the horizontal frame by rotating the rack gear in a horizontal frame with teeth and guide grooves to reduce the gap between the front and rear wheels of the bicycle. The purpose is to provide.

In addition, the present invention is to separate the pedal crank of the bicycle as a pedal crank separating device consisting of a coupling pin and a spring, and to add a vertical frame consisting of a plate of the triangular structure of one side and the other side for convenient configuration of the adult In a bicycle whose size is sufficient for a vehicle, another object is to provide a city-type portable bicycle having convenience in use by reducing the size of the bicycle and then pursuing more convenience of movement.

In order to achieve the above object, the present invention provides a portable bicycle capable of deploying and reducing a bicycle in a longitudinal direction, wherein a saddle is mounted at an upper portion thereof, a rear wheel is mounted at a lower portion thereof, and one side and another vertical frame spaced apart from each other by a predetermined distance; A horizontal frame having a handle bar at one upper side thereof and a front wheel mounted at the lower side thereof and slidable in the longitudinal direction by penetrating into the spaced space of the vertical frame; When the horizontal frame is slid, the drive shaft of the drive chain croquet wheel mounted on the vertical frame can be moved up and down along the guide groove formed to be inclined vertically on the vertical frame, so that the drive chain croquet wheel does not interfere with the front wheel in the bicycle reduction position. Lifting device of the drive chain sprocket wheel to avoid; characterized in that consisting of.

According to a preferred embodiment of the present invention, the handlebar folding device 10 having a connecting link and a fixing device on one side and the other side of the handle plate facing the end of the handlebar, and a pair of guide rollers and the horizontal frame to adjust the length It is attached to the rack gear so as to accommodate the lifting device 40 of the drive chain sprocket therein, and has a vertical frame 20 consisting of a plate material on one side and the other side to which a toggle clamp is attached on the upper side, the teeth of the lower The guide rack of the roller is formed in the formed rack and the suspension, and the pedal frame crank separation device 50 consisting of a horizontal frame 30 and a plurality of separation pins and springs formed with a plurality of holes in the upper bike size of the adult enough In, by reducing the size of the bicycle is achieved by providing a city-type portable bicycle having the convenience of use to pursue more convenience of movement.

According to the present invention, the bicycle maintains the size that an adult can ride sufficiently in the stretch mode, and in the stretch mode, the front and rear wheels are as close as possible to reduce the length to the minimum, and the width of the bicycle. The handlebars can be folded and the pedal cranks can be removed to reduce the overall width to below the saddle width, and the front wheel of the bicycle is free from interference by the bicycle drive shaft chain sprocket wheel. In addition to being a portable bicycle, it is possible to ride a bicycle using public transportation.

First, it has one size bike structure for adults to ride in height mode.

Second, in the stretch mode, the front and rear wheels of the bicycle are as close as possible and the bicycle can be reduced to less than the saddle width so that it can be carried easily and easily when using public transportation, while minimizing inconvenience to others.

Third, in the normal mode, the length of the bicycle can be adjusted to fit the body shape of the bike, so it is possible to cope with the body size of the bike user,

Fourth, by using a triangular frame configuration of one side and the other as a plate material, it is possible to easily adopt a variety of materials, it is easy to lighten the bicycle,

Fifth, it is a very useful invention that is configured to have the advantage of increasing the traffic sharing ratio by using the bicycle in the city, it is a very useful invention to provide a city-type portable bicycle that can be carried on the public transport casually in place of the existing general bicycle.

The present invention provides a portable bicycle that can be deployed and reduced in the longitudinal direction of the bicycle, the saddle is mounted on the upper portion and the rear wheel is mounted on the lower side and one side and the other vertical frame spaced apart a certain distance; A horizontal frame having a handle bar at one upper side thereof and a front wheel mounted at the lower side thereof and slidable in the longitudinal direction by penetrating into the spaced space of the vertical frame; When the horizontal frame is slid, the drive shaft of the drive chain croquet wheel mounted on the vertical frame can be moved up and down along the guide groove formed to be inclined vertically on the vertical frame, so that the drive chain croquet wheel does not interfere with the front wheel in the bicycle reduction position. The lifting and lowering device of the drive chain sprocket wheel to prevent the front wheel and the driving sprocket wheel from interfering with each other when the bicycle is reduced by the lifting device of the driving chain sprocket wheel, so that the steering angle of the front wheel is free.

Hereinafter, the present invention will be described in detail with reference to the drawings showing examples of the present invention, and the structure of the illustrated drawings is only one embodiment showing a preferred embodiment of the present invention and is not intended to limit the present invention.

1 is an external view comparing the before and after reduction of the present invention, Figure 2 compares the before and after reduction of the portable bicycle of the prior registered patent No. 10-0854018 (hereinafter referred to as the 'prior invention patent'). 2A is a drawing and FIG. 2B is a reference diagram showing a picture of an actual product.

As shown in FIG. 2, the invention has advanced the rear wheels to reduce the bicycle, and the steering wheel 10 is left to change the direction in the case of moving the bicycle while holding the folded steering wheel 10. If the steering is to be rotated to the right, there is a problem that the drive shaft chain sprocket wheel 20 and some of the front wheels of the bicycle cause mutual interference.

That is, when the front wheel is in contact with the chain sprocket wheel 20 when turning the angle of the front wheel for steering, steering is not made at a sufficient angle, and there is an inconvenience in that steering is performed two or three times or by lifting the front wheel of the bicycle.

On the contrary, the present invention, which has improved the prior patent invention, shows a bicycle in a deployed state and a bicycle in a stretched state as shown in FIG. 1, and a handlebar folding device (to facilitate carrying and storing the bicycle) 10) and the vertical frame 20, the horizontal frame 30, the lifting device 40 of the drive chain sprocket wheel, characterized in that consisting of a pedal crank separating device (50).

Figure 3 illustrates in detail the structure of the handlebar folding device 10 in the present invention, the upper side shows a state in which both sides of the handle unfolds in a straight line, the lower side shows a state in which both handles folded at an angle of 180 degrees.

As shown in FIGS. 1 and 3, the handle bar folding apparatus 10 has a guide groove 10-1 and a side turning plate 10-3 having a key groove 10-2 formed at a right angle of 90 degrees. ) Is shown, and the other side turning plate 10-4 is formed in which the guide groove and the key groove are symmetrically.

The hinges 10-5 are positioned at the centers of the one side and the other side turning plates 10-3 and 4, respectively, and the guide pins 10-6 are introduced into the guide grooves 10-1, respectively. And the other side turning plate (10-3,4) serves to determine the guide and the 90-degree position during rotation.

The link pins 10-7 are attached to the one side and the other side turning plates 10-3 and 4, respectively, and the link links 10-8 are connected to the link pins 10-7.

Here, the key 10-9 is inserted into the key groove 10-2 formed in the one side and the other side turning plates 10-3 and 4, respectively, to restrain the shaking of each turning plate 10-3 and 4, respectively. Up and down motion of the key (10-9) and the lower plate and the upper cover plate is not shown in the figure, but the vertical movement is operated by the compression force of the spring of the lower plate, the hinge (10-5) and the guide pin (10) -6) is fixed to the bottom plate. Since this structure is similar to the content of the pre-registered folding handle bar, a detailed description thereof will be omitted.

In addition, the left and right handlebars of the bicycle formed of a conventional circular tube are inserted and fixed to the protrusions of one side and the other side turning plates 10-3 and 4.

The operation of the handlebar folding device 10 of this structure will be described. First, after lifting the key (10-9) is inserted into the key groove (10-2) and then turning the one side turning plate (10-3) toward the bicycle driver around the hinge (10-5), the connecting link (10-8) is also turning at the same time, the other turn plate (10-4) is also turned to 90 degrees toward the cyclist, and when the turning of each turn plate (10-3,4) is completed, the guide pin (10-6) Stopped by

Also, the result of turning in the reverse direction is the same.

At this time, the raised key (10-9) is inserted between the key groove (10-2) by the repulsive force of the spring again to bind the one side and the other turn plate (10-3,4).

Also, the result of turning in the reverse direction is the same.

This structure is more cost effective compared to the method of turning the pre-registered counter gear, and the process is simplified by press work, and the 90-degree positioning power is excellent to minimize the shake, which is a problem of the folding steering wheel when driving. There is an advantage to this.

Subsequently, FIG. 4 shows the structure of the vertical frame 20 of FIG. 1 and shows a front view on the left side and a side view on the right side.

1 and 4, in the vertical frame 20, one vertical frame 20-1 and the other vertical frame 20-2, which are formed by molding a plate, are installed at a predetermined distance apart from each other. And the horizontal frame 30 and the lifting device 40 of the driving chain sprocket wheel, which will be described later, in the other vertical frames 20-1 and 2.

First, the guide grooves 20-3 are formed to allow the driving chain sprocket wheel to be lifted up and down on the one side and the other vertical frames 20-1 and 2.

In using the one side and the other vertical frame by molding a plate, the present invention is currently being produced by die-casting an aluminum alloy, but the present invention is not limited to the material, can be used by molding a magnesium alloy or a high elastic plastic composite, In this case, since the bicycle can be made lightweight and high rigidity, the vertical frame 20 As long as the material can be changed, there is no limitation on the material, and the shape is preferably a plate material.

And, between the one side and the other vertical frame (20-1, 2), each of the fixing pins are attached to one end and the fixing pin is shown in the guide roller (20-4) of the structure in which the rotating bearing is constructed, both ends are supported The center rack gear 20-6 supported by the bearing and provided with the rotary handle 20-5 at the end is shown, and the second rack gear 20-8 meshed with the first rack gear 20-7. Is shown.

And a connecting pin 20-9 is shown to connect the one and the other vertical frame 20-1,2 and the rotating cam 20-10 is built in the center of the connecting pin.

Subsequently, the upper cover plate 20-11 is fixed to the top of one side and the other vertical frame, and the toggle clamp 20-12 is attached to the upper surface of the upper cover plate 20-11.

This structure allows the guide roller 20-4 to be inserted into the guide groove of the horizontal frame 30 to be described later so that the horizontal frame can slide smoothly, and the center rack gear 20-6 is a horizontal frame. It is engaged with the central rack attached to the lower surface of the rotatable knob to rotate the horizontal frame to move, the first rack gear 20-7 is engaged to another first rack attached to the bottom of the horizontal frame. It is rotated when the horizontal frame is moved and rotates the second rack gear (20-8) engaged in association.

This is to enable the automatic raising and lowering of the elevating device 40 of the drive chain sprocket wheel, which will be described later, as described with reference to FIG. 1, and the rotary cam 20-10 drives the drive chain sprocket while driving the bicycle. Restrains the lifting device of the wheel, and the toggle clamp 20-12 inserts the tip pin of the toggle clamp into one hole of the positioning plate having a plurality of holes attached to the upper surface of the horizontal frame. This is to adjust the length of the bicycle and to position it to fit the body size of the driver, and also to promote driver safety by constraining the horizontal frame while driving the bicycle.

5 shows a detailed structure of the horizontal frame 30.

1 and 5, sliding grooves 30-1 are formed on left and right sides of the horizontal frame 10, and a plurality of connecting plates 30-2 connecting left and right sides are formed. It is seen that the head tube 30-3, which is attached to the front fork of the bicycle, is inserted into the front end to facilitate smooth steering, and is integrally formed.

Such a structure is currently in use by molding an aluminum alloy or magnesium alloy by a die casting method, the present invention is not limited to this, and produced a predetermined length continuously using the extrusion method in the form of a cross section shown in Figure 5-a. After cutting the length of the horizontal frame of the bicycle, the head tube (30-3) is also changed to connect the cross-section A-A 'cross section after the separate production, it is possible to significantly reduce the weight and cost, Therefore, it should be understood that the horizontal frame material or the manufacturing method of the present invention is not limited.

And, as shown in the cross-section B-B 'is a central rack (30-4) is formed on the lower center of the horizontal frame in a series of teeth are linearly fixed to the lower surface of the connecting plate (30-2), only a certain length Another first rack (30-5) equal to is attached to the bottom of the connecting plate and the connecting plate in parallel with the central rack (30-4).

Here, the first rack having only a predetermined length is a length enough to raise and lower the lifting device 40 of the driving chain sprocket wheel, which will be described later, by a predetermined distance to an upper limit and a lower limit.

Subsequently, as shown in the cross-section C-C 'toward the rear end of the horizontal frame, a positioning plate 30-6 having a plurality of holes is attached to the upper end of the horizontal frame 30, and the length of the bicycle is reduced to the front end. Positioning holes 30-7 are formed to constrain the horizontal frame.

This structure is inserted into the guide roller (20-4) described between the sliding groove (30-1), the center rack (30-4) is engaged with the center rack gear (20-6) is the center rack gear ( 20-6) by rotating the horizontal frame 30 to the reciprocating sliding, the first rack (30-5) having a certain length is equal to only before sliding down the horizontal frame to shrink the bicycle completely It is engaged with the first rack gear 20-7 from a certain distance so that the drive chain sprocket wheel which will be described later can be automatically raised. After sliding the horizontal frame to extend the bicycle to its maximum length, the center rack gear is rotated to its length to suit the driver's body, and after adjusting some of its length, a plurality of positioning holes formed in the positioning plate 30-6. The bicycle driver 3030-7 operates the toggle clamp 20-12 into one hole at a desired position, thereby lowering the up and down pins to safely restrain the movement of the horizontal frame.

In addition, after carrying out the sliding of the horizontal frame to reduce the bicycle to the minimum length for carrying and storing the bicycle, the pin is lowered into the positioning hole (30-7) by operating the toggle clamp (20-12). To constrain the horizontal frame.

6 shows the elevating device 40 of the drive chain sprocket wheel.

As shown in FIGS. 4 to 6, the bearing housing 40-1 having both ends formed in a plane inside the guide groove 20-3 formed on the one side and the other vertical frames 20-1 and 2 described above. Is inserted. The bearing housing 40-1 having both ends formed into a surface is an expression on the drawing, and the case may be a rectangular bearing housing having four sides formed with a surface.

And the drive shaft (40-2) of the bicycle is inserted into the inner peripheral surface of both ends of the bearing housing (40-1), the bearing is built in one end of the drive shaft, the drive chain sprocket wheel (40-3) is built in one end of the drive shaft Structure. And both ends of the drive shaft is formed in a rectangular cross-section and a hole is penetrated form the pedal rank to be described later attached and detached.

Subsequently, a lifting rack 40-4 having a tooth shape is fixed to one surface of the bearing housing 40-1 having both ends formed on a surface thereof, and a rotating cam that restrains the bearing housing when the bicycle is driven on another surface. 20-10) will be in close contact. The elevating rack 40-4 is engaged with the second rack gear 20-8 (see FIG. 4).

Referring to the operation of this structure, first, if the bicycle needs to be carried or stored, by rotating the rotary handle 20-5 (see Fig. 4) attached to the center rack gear 20-6 described above. In the process of sliding the horizontal frame 30 so that the front wheel portion of the bicycle approaches the rear wheel, another first rack 30-5 having the same length as the first rack gear 20-7 as shown in FIG. The first rack gear 20-7 rotates and the second rack gear 20-8 that is engaged also rotates from the moment when it is engaged with), and the ascending and descending rack 40-4 starts to ascend. The lifting rack 40-4 and the fixed bearing housing 40-1 rise along the guide groove 20-3, and the horizontal frame is slid so that the front wheel portion of the bicycle has a minimum distance toward the rear wheel. While being spaced apart, the bearing housing 40-1 stops rising.

In this case, the guide roller 20-4 inserted into the sliding groove 30-1 formed on the left and right sides of the horizontal frame described above is in contact with the end line of the sliding groove 30-1. This is the case.

 In this case, the user may know that the bicycle is the minimum distance that can be reduced, and the sliding groove 30-1 and the guide roller 20-4 are in contact even when the bicycle is to be extended to the maximum distance. In this case, the maximum extension distance and the minimum reduction distance can be confirmed by not being extended any more, and the distance of the sliding groove 30-1 is limited to facilitate positioning.

At this time, the horizontal frame is restrained by operating the toggle clamp 20-12 between the positioning holes 30-7 formed in the upper end surface of the horizontal frame to lower the pin at the front end into the positioning hole. And, since the horizontal frame 30 is no longer able to slide, the raised bearing housing 40-1 cannot fall freely. Therefore, when the bicycle is reduced and moved as shown in FIG. 1, the position of the driving chain sprocket wheel 40-3 is increased so that it does not interfere with the front wheel of the bicycle.

When the bicycle is stretched by sliding the horizontal frame again, the toggle clamp 20-12 is operated to raise the pin inside the positioning hole 30-7 and rotate the rotary knob 20-5 to rotate the horizontal frame. When sliding the first rack gear (20-7) and the second rack gear (20-8) are respectively rotated in reverse, the lifting rack (40-4) is another first rack to start the descent and the same length only As soon as (30-5) passes, the rotation of the first rack gear 20-7 and the second rack gear 20-8 is stopped, and the elevating rack 40-4 also stops descending. The lower surface of the bearing housing 40-1 is in contact with the lower surface of the guide groove 20-3. Subsequently, the horizontal frame is slid to the maximum extension size, and the tip of the toggle clamp is inserted into the hole of the positioning plate 30-6 having a plurality of holes to constrain the horizontal frame, and the rotation cam 20 The bicycle is safely driven by restraining one side of the bearing housing 40-1.

7 is a diagram of a pedal crank separation device 50 according to the present invention, FIG. 7A is a view, and FIG. 7B is a picture of an actual product.

As shown in FIG. 7, the pedal crank separating apparatus 50 has a structure in which the pedal crank body 50-1 is shown, and then the upper cover 50-2 is coupled to the body.

A groove 50-3 having a rectangular cross section is formed inside the upper end of the pedal crank body 50-1, and a coupling groove 50-4 for easily coupling with the upper cover 50-2 is provided. It is formed.

And the upper cover 50-2 is attached to the coupling pin (50-5) and the spring (50-6), the circular ring (50-7) is attached to the upper portion of the coupling pin (50-5) It is configured to pull the coupling pin.

This structure makes the top cover 50-2 separate from the pedal crank separating device of the first patent invention so as to be coupled to the pedal crank body 50-1, thereby greatly increasing the reciprocating stroke of the coupling pin 50-5. Can be taken.

In this case, the coupling pin 50-5 is inserted into a hole formed in the square end surface of both ends of the driving shaft 40-2 (see FIG. 6) described above, and the pedal crank body 50-1 is disengaged while traveling. To prevent and minimize the swing play, the coupling pin (50-5) can be inserted into the hole formed in the square end surface of the both ends of the drive shaft depth can further improve the safety, and is manufactured separately The upper cover 50-2 has a feature to increase the aesthetics of the pedal crank.

Although the present invention has been described in a limited way with respect to the above-mentioned preferred embodiments, it will be readily apparent to those skilled in the art that various other modifications and variations can be made without departing from the spirit and scope of the invention. It is obvious that all changes and modifications made in the form and equivalents of the technical spirit of the present invention, as well as equivalents and equivalents, as well as changes and modifications made by those skilled in the art belong to the appended claims.

1 is an external view comparing the before and after reduction of the present invention.

Figure 2 is a comparison of the before and after reduction of the portable bicycle of the first invention patent No. 10-0854018, Figure 2a is a reference, Figure 2b is a reference picture showing the actual product photo.

3 is a view showing a handlebar folding device in the present invention.

4 is a vertical frame diagram according to the present invention.

5 is a horizontal frame diagram according to the present invention.

6 is a view of the lifting device of the drive chain sprocket wheel according to the present invention.

Figure 7 is a pedal crank separating device according to the present invention, Figure 7a is a view, Figure 7b is a picture of the actual product.

<Description of Symbols for Main Parts of Drawings>

10: handle bar folding device 10-1: guide groove

10-2: Key groove 10-3: One-sided turning plate

10-4: other turn wheel 10-5: hinge

10-6: Guide Pin 10-7: Link Pin

10-8: Link 10-9: Key

20: vertical frame 20-1: one-sided vertical frame

20-2: other side vertical frame 20-3: guide groove

20-4: Guide roller 20-5: Rotating handle

20-6: Central Rack Gear 20-7: First Rack Gear

20-8: 2nd gear rack 20-9: Connecting pin

20-10: rotating cam 20-11: upper cover plate

20-12: Toggle Clamp

30: horizontal frame

30-1: sliding groove 30-2: connecting plate

30-3: head tube 30-4: center rack

30-5: First rack 30-6: Positioning plate

30-7: Positioning hole

40: Lifting and lowering device of drive chain sprocket wheel

40-1: bearing housing 40-2: drive shaft

40-3: drive chain sprocket wheel 40-4: lifting rack

50: Pedal Crank Separator

50-1: Pedal Crank Body 50-2: Top Cover

50-3: square section groove 50-4: coupling groove

50-5: coupling pin 50-6: spring

50-7: Circular Rings

Claims (10)

In the mobile bicycle which can expand and contract the bicycle in the longitudinal direction, The vertical frame 20 is composed of one side and the other vertical frame 20-1,2 with a saddle mounted on the top and a rear wheel mounted on the bottom, and spaced apart from each other by a predetermined distance. A horizontal frame 30 provided with a handle bar at one side and a front wheel mounted at a lower side thereof, and penetrating into the spaced space of the vertical frame 20 to be slidable in the longitudinal direction; When the horizontal frame 30 is slid, the drive shaft 40-2 of the drive chain croquette wheel 40-3 mounted on the vertical frame is lifted along the guide groove 20-3 formed to be inclined in the vertical frame in the vertical direction. The lowering device 30 of the driving chain sprocket wheel to enable the lowering, so that the driving chain croquette wheel 40-3 does not interfere with the front wheel in the bicycle reduction position; Lifting device 30 of the drive chain sprocket wheel, A central rack gear 20-6 having both ends supported by a support bearing and having a rotary handle 20-5 at the end thereof, and a first rack gear 20-7 formed at one side of the guide groove 20-3; A second pin gear 20-8 engaged with the first rack gear, a connecting pin 20-9 for connecting the one side and the other vertical frames 20-1, 2, and a center of the connecting pin A vertical frame 20 including the rotated cam 20-10; A central rack 30-4 engaged with the central rack gear, and a first rack meshed with the first rack gear 20-7 and having a predetermined length so as to correspond to movement of an upper limit and a lower limit when the driving chain sprocket wheel descends; A horizontal frame 30 including a rack 30-5 to be slidable during rotation of the rotation handle; A bearing housing 40-1 having both ends inserted into both guide grooves 20-3 of the vertical frame, a drive shaft 40-2 of the bicycle inserted into the inner circumferential surfaces of both ends of the bearing housing, and one end of the drive shaft Drive chain wheel 40-3, a lifting rack 40-4 formed on one surface of the bearing housing and engaged with the second rack gear, and a rotating cam 20 to restrain the bearing housing when the bicycle is driven. Urban portable bicycle, characterized in that consisting of the elevating device 40 of the drive sprocket wheel comprising a -10). delete The method of claim 1, Wherein the handle bar to be folded so as to overlap the left and right handlebars to each other, the urban portable bicycle, characterized in that it comprises a handlebar folding device that allows the other handlebar to rotate when the handlebar is rotated. The method of claim 3, wherein The handle bar folding device, One side and the other turn plate (10-3,4) which is rotatable about the hinge (10-5) at the opposite end of the handlebars on both sides and connected to the connecting link (10-8) to enable mutual interlocking rotation , Guide grooves 10-1 formed on the respective turning plates and guide pins 10-6 inserted therein to be rotatable at an angle of 90 degrees; Inner-type portable bicycle, characterized in that made of a key (10-9) is inserted into the key groove (10-2) formed in each of the turning plate and the vertical movement is operated by the elastic force by the spring to restrain the rotation position of each turning plate. . The method of claim 1, City-type portable bicycle, characterized in that it further comprises a pedal crank separating device 50, the pedal crank is removable, attached to both ends of the drive shaft. The method of claim 5, The pedal crank separating device is composed of a pedal crank body 50-1 and an upper cover 50-2 coupled to the pedal crank body, The pedal crank body has a groove 50-3 having a rectangular cross section to be fitted to an end having a rectangular cross section at both sides of the drive shaft on one side thereof, and a coupling groove 50-4 for fixing the top cover 50-2. ) Is formed, The upper cover is elastically supported by a spring (50-6) is coupled to the coupling pin (50-5) protruding in the groove, the circular ring formed so as to pull the coupling pin from the top of the coupling pin (50-5) Urban portable bicycle, characterized in that consisting of 50-7). The method according to any one of claims 1 and 3 to 6, The upper cover plate 20-11 is fixed to the upper side of the one side and the other vertical frame, the toggle clamp 20-12 is installed on the upper surface of the upper cover plate 20-11, And a positioning plate (30-6) formed on the upper surface of the horizontal frame and having a plurality of positioning holes (30-7) to insert the leading pin of the toggle clamp. The method according to any one of claims 1 and 3 to 6, Each fixing pin is attached to one end between the one side and the other vertical frame 20-1, 2, and the fixing pin is provided with a guide roller 20-4 having a rotating bearing built therein. City-type portable bicycle, characterized in that the sliding groove (30-1) for guiding the guide roller on the left and right sides of the horizontal frame (10). The method according to any one of claims 1 and 3 to 6, The material of the vertical frame is a city-type portable bicycle, characterized in that any one of aluminum alloy, magnesium alloy, plastic composite. The method according to any one of claims 1 and 3 to 6, The horizontal frame is produced by the extrusion method to produce a predetermined length continuously and then cut by the horizontal frame length of the bicycle, characterized in that by connecting the head tube (30-3) prepared separately to the front of the horizontal frame Urban portable bicycle.

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