JP2001146188A - Folding bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a folding bicycle that, in its in-use or rideable position, can ensure a long wheelbase offering a good style and good ride comfort, ensure sufficient body rigidity, and adopt standard wheels, and in its carried position, folds small and is easy to walk with the wheels rolled in a side-by-side relation. SOLUTION: A bicycle body comprises a head tube 11, a seat tube 12, a connecting frame tube 13, a front fork 14, and a rear frame 15. The connecting frame tube 13 has hinge portions at two places so that it is divisible into three sections. When the bicycle body is folded in three along the hinge portions, a front wheel 16 and a rear wheel 18 are placed in a side-by-side relation, and a stem 26 extends, in the side view, in the angle range of ±40 deg. with an extension 55 to the line connecting the center of a hub 19 of the rear wheel 18 and the center of a crankshaft 35 as measured opposite the origin of the extension 55.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folding bicycle capable of folding a vehicle body, and more particularly to a folding bicycle in which the folded bicycle can be moved along the ground by folding and side-by-side wheels. About bicycles.

[0002]

2. Description of the Related Art Conventionally, folding bicycles have generally been compactly folded when stored for transportation in a trunk of a passenger car or the like. In recent years, folding bicycles have been used as a method of transporting folded bicycles. Folding bicycles have been devised that can be moved along the ground by wheels arranged in a row.

[0003] FIG. 13 shows a configuration shown in FIG.
No. 1833, which discloses a front support 61 and a rear support 62, the upper ends of which are interconnected and the lower ends of which are respectively mounted with wheels, a bottom support 63 connected near the lower ends of the two supports. After the frame fixing member 64 of the bottom support 63 is loosened, the front support 61 and the rear support 62 are parallel and the front wheel 65 and the rear wheel 66 are overlapped at one end and folded. The upper part of the folded frame is gripped and transported along the ground by a superposed wheel.

[0004]

However, the conventional folding bicycle as described above has the following problems. In general, a folding bicycle has a shorter wheelbase than a regular bicycle because it folds smaller, and its appearance is like a raised handlebar and saddle of a child's bicycle, resulting in a poorer style. In addition, the bicycle is inferior to ordinary bicycles, and there is a problem that the bicycle is suspended by hand when carrying the bicycle, so that the load on the hand is large and it is difficult to hold the bicycle.

[0005] In the example of FIG.
In addition to the problem of poor style and poor ride quality due to L being shorter than ordinary bicycles, there are also the following problems. Particularly in the case of a triangular frame configuration, the front support 6
The connection point 67 between the first support column 62 and the rear support column 62 needs a degree of freedom of rotation in two directions for steering and folding, and the connection between the front support column 61 and the bottom support column 63 is required for steering. The connection by the pivot device 68 in consideration of the degree of freedom of rotation and the removal for folding, and the connection between the rear support 62 and the bottom support 63 are connections with freedom of rotation for folding. From
There is a safety problem that the rigidity of the vehicle body in the left-right direction may not be secured during traveling. Also, the front wheels 65
It is necessary to support the rear wheel 66 with a cantilever shaft in order to fold and superimpose, and a shaft larger than the support shaft of a bi-axial shaft type of a normal bicycle is required from the viewpoint of shaft strength, and the entire wheel including the hub is required. There is also a problem that it has to be custom-made and the cost is high.

[0006] Recently, it has been strongly desired that eco-friendly measures such as energy saving measures for automobiles and exhaust gas emission regulations be made, especially for bicycles. It is very useful to improve the global environment if you travel by bicycle and use public transportation such as trains and buses, and after getting off the public transportation, riding a bicycle to the final destination is very useful for improving the global environment. At present, there is no folding bicycle that can be transported easily, such as when switching to public transportation, while maintaining good style, riding comfort, and traveling safety.

[0007] The present invention solves the above-mentioned problems. When a bicycle is used, a long wheelbase is ensured to maintain good style and ride comfort as in a normal bicycle, and the vehicle can be moved in the lateral direction during running. Sufficient rigidity can be ensured, and when folded, small folded wheels can be moved along the ground by the side-by-side wheels to reduce the load on the hand during transportation, and can be easily transported, and standard parts can be used for the entire wheel It is an object to provide a folding bicycle which can be manufactured at low cost.

[0008]

Means for Solving the Problems In order to solve the above problems, a folding bicycle according to the present invention is a folding bicycle capable of folding a vehicle body, comprising: a connecting frame pipe for connecting a head pipe and a standing pipe; A front fork which is rotatably mounted on the head pipe and whose upper end is connected to the handle post and which supports the front wheel at the lower end, and a rear frame which supports the rear wheel behind the standing pipe,
A bicycle having crankshaft mounting means provided near the standpipe,
Two hinge portions are provided so as to be divided, and when viewed from the side, the projected line of the center axis of the hinge portion has a C shape, and the rear frame and the front wheel are bent by bending the connecting frame pipe by the hinge. Are aligned sideways, and the position of the handle post as viewed from the side is an angle range of ± 40 degrees with the apex center of the rear wheel as the vertex with respect to the extension line connecting the center of the rear axle with the center of the crankshaft. It is characterized by being in. According to this, when riding a bicycle, a long wheelbase is secured to maintain a comfortable and comfortable style like a normal bicycle, standard parts can be used for the whole wheel, and it can be manufactured at low cost. When folded, it can be easily transported by folding it small, holding the handle post by hand, folding it, and moving it along the ground with the wheels arranged side by side.

In addition, there is provided a bending restricting means for restricting or releasing the bending operation of the communication frame pipe by the hinge portion, and restricting or restricting the extension operation of the communication frame pipe bent by the hinge portion. The present invention is characterized in that an extension restricting means for canceling is provided. According to this, sufficient rigidity can be ensured in the lateral direction of the vehicle body when the bicycle is running, and the form in which the bicycle is folded and transported is stabilized, and the folded bicycle is pulled and transported like a cart by holding the handle post by hand. It is possible to carry easily with less load on the hand.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A folding bicycle according to an embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2 and the like, the folding bicycle includes a vehicle body part such as a head pipe 11, a standing pipe 12, a connecting frame pipe 13, a front fork 14, and a rear frame 15, and a front wheel 16, A traveling device such as a rear wheel 18 that actually exhibits a traveling function; a seat device such as a saddle 20 or a saddle post 21 for a person to sit on; a steering device such as a steering wheel 25 or a steering wheel 26 that operates in a traveling direction; A drive unit for transmitting the driving force of the crank 35, the cranks 28, 28, the pedals 29, 29 and the like to the rear wheel 18 of the traveling device via the crank gear 30 and the chain 31 of the transmission material is provided. In addition, the size of the front wheel 16 and the rear wheel 18 is set to 18 inches or less in consideration of the size of the outer shape after folding.

Since the connecting frame pipe 13 is bent to make the outer shape compact for transportation and storage, it is simplified without using a top pipe and a down pipe used in a general bicycle. ing. However, the same operation and effect can be obtained by using a top pipe and a down pipe (not shown) employed in a general bicycle without simplifying the connecting frame pipe 13. The connecting frame pipe 13 has a front hinge portion 32 provided behind the head pipe 11 and a rear hinge portion 33 provided in front of the standing pipe 12. These two hinge portions are separated from each other and are connected to each other. The frame pipe 13 is divided into three parts.

By folding the body three times by bending the connecting frame pipe 13 by the two hinge portions,
Even if the vehicle body has a long wheelbase, it can be folded small, so that the outer shape becomes small after folding, so that the bicycle can be easily transported and stored. In addition, when using the bicycle by extending the folded body, a long wheelbase can be secured, the style is improved, and a comfortable ride can be maintained.

The front fork 14 is rotatably mounted about the center axis of the head pipe 11, and its lower end is branched left and right like a left side 14b and a right side 14a to form a front wheel 16a.
Screws 17a, 1 at both ends of the support shaft 17 so as to sandwich
7a is fixed by nuts 17b and 17b, and the front wheel 16 is rotatably held. Therefore, the front wheel 16 can use a wheel of a standard part. A handle post 26 having a handle 25 at the upper end is provided at the upper end of the front fork 14.
Are fixed by a handle post fixing mechanism 27.
Tightening fixing screw 36 of the handle post fixing mechanism 27
By loosening the handle post 26, the handle post 26 can be removed from the upper end of the front fork 14. By folding the vehicle body and removing the handle post 26 as shown in FIG. 7, storage in a narrow place such as a coin locker becomes possible. It should be noted that, in place of the detachable steering device as in the embodiment, the same applies even when a handle post folding means (not shown) for folding the handle post using a hinge to reduce the outer size, which is provided in a known folding bicycle, is used. An effect can be obtained.

A seat fixing mechanism 24 is provided at the upper end of the standing pipe 12, and a saddle post tube 23 is fitted inside the standing pipe 12 and fixed by the sheet fixing mechanism 24. Has a saddle post fixing mechanism 22 and a saddle 2 at the upper end.
The saddle post 21 to which the “0” is attached is fitted into the inside of the saddle post tube 23 and the saddle post fixing mechanism 2
Fixed at 2. When folding the bicycle, the fastening screw 37 of the seat fixing mechanism 24 is loosened as shown in FIG. 5, the saddle post tube 23 is stored inside the upright pipe 12, and the fastening screw 38 of the saddle post fixing mechanism 22 is loosened. The saddle post 21 is housed inside the saddle post tube 23 to reduce the size of the folded bicycle. The same applies when saddle post folding means (not shown) for folding a saddle post using a hinge to reduce the outer shape is mounted on a known folding bicycle instead of the telescopic seat device as in the embodiment. An effect can be obtained.

The rear frame 15 is provided so as to protrude to the rear of the standing pipe 12, and has a strength to withstand the gravity of a passenger or the like, the reaction force of the rear wheel 18 and the tension of the chain 31, thereby simplifying the structure. . However, the same operation and effect can be obtained by using a chain stay and a seat stay (not shown) employed in a general bicycle without simplifying the rear frame 15. The rear end of the rear frame 15 is divided into left and right sides 15b and 15a as shown in FIG.
a, 19a are fixed by nuts 19b, 19b, and the rear wheel 18 provided with the freewheel 39 is rotatably held. Therefore, a wheel of a standard part can be used for the rear wheel 18.

The crankshaft mounting means 34 provided in the vicinity of the vertical pipe 12 is provided with a crankshaft 35 by a ball bearing (not shown), a bearing presser, or the like.
Are rotatably supported, and a crank gear 30, cranks 28, 28 are provided on the crank shaft 35, and the crank 28,
The power obtained from the pedals 29 attached to the gear 28 is transmitted from the crank gear 30 to the freewheel 39 via the chain 31 which is a transmission material, and drives the rear wheel 18. If pedal folding means (not shown) provided in a known folding bicycle is incorporated, the pedals 29, 29 do not protrude from the folded outer shape of the bicycle, which is advantageous.

Next, an example of the hinge portion of the embodiment will be described. As shown in FIGS. 8 and 9 in detail,
The connecting frame pipe 13 has a front hinge part 32 provided behind the head pipe 11 and a rear hinge part 33 provided in front of the standing pipe 12. These two hinge parts are viewed from the side. In this case, the projection center line 56 of the bending center axis 32c of the front hinge section 32 and the projection center line 57 of the bending center axis 33c of the rear hinge section 33 exhibit a C-shape, and their extension lines intersect on an extension. The two hinge portions divide the connecting frame pipe 13 into three parts, are divided and connected at the hinge portion, the middle connecting pipe 13a, the front connecting pipe 13b of the front part, and the rear connecting pipe of the rear part. 1
3c to form a bendable and divided connecting frame pipe 13 composed of:

As shown in detail in FIG. 10, of the three cylindrical portions of the front hinge portion 32, the central middle cylinder 32a is welded to the middle connecting pipe 13a, which is the central portion of the divided connecting frame pipe 13, and the like. The outer cylinders 32b, 32b at both ends are integrated by welding or the like with the front connecting pipe 13b, which is the front part of the divided connecting frame pipe 13. Further, the bending center axis 32c of the front hinge portion 32 passes through the three cylindrical portions in the order of the outer cylinder 32b, the middle cylinder 32a, and the outer cylinder 32b, and is fixed so that both ends do not come off by caulking. A front hinge portion 32 that bends about the axis 32c is formed.

Similarly, of the three cylindrical portions of the rear hinge portion 33, the central middle cylinder 33a is integrated with the middle connecting pipe 13a, which is the central portion of the divided connecting frame pipe 13, by welding or the like. Outer cylinders 33b, 33 at both ends
b is integrated with a rear communication pipe 13c, which is a rear part of the divided communication frame pipe 13, by welding or the like. The bending center axis 33c of the rear hinge portion 33 is
Outer cylinder 33b, middle cylinder 33a, outer cylinder 3
The rear hinge portion 33 is formed so as to penetrate in the order of 3b and not to be disengaged at both ends by caulking or the like, and to bend around the bending central axis 33c.

As shown in FIGS. 5 and 6, the folding state of the folding bicycle is defined by a front hinge portion 32 and a rear hinge portion 3.
3, the rear wheel 18 and the front wheel 16 are arranged side by side, and the position of the handle post 26 as viewed from the side is adjusted to the support shaft 19 of the rear wheel 18.
It is preferable that the angle be within a range of ± 40 degrees with the center of the support shaft 19 of the rear wheel 18 as an apex with respect to the extension line 55 connecting the center of the crankshaft 35 with the center as the origin. The above ±
The position of the handle post 26 within the range of the angle of 40 degrees is determined by the mounting position and the mounting angle of the front hinge portion 32 and the rear hinge portion 33 on the communication frame pipe 13. As a result, the folded bicycle can be transported by holding the handle post 26 by hand and pulling it like a cart so that the front wheels 16 and the rear wheels 18 which are folded and rolled sideways roll on the ground.

Next, the folding process of the folding bicycle will be described with reference to the drawings. When the rear hinge portion 33 is bent and viewed from the side as compared with FIG. 1 in a state before being folded, the front wheel 1 is located near the upper portion of the rear wheel 18 as shown in FIG.
6 is located.

Next, when the front hinge portion 32 is further bent from the state shown in FIG. 3 and viewed from the side, as shown in FIG. 4, the rear wheel 18 and the front wheel 16 overlapping and hidden therefrom are arranged side by side. The position of the handle post 26 is ± with the center of the support shaft 19 of the rear wheel 18 as an apex with respect to the extension line 55 connecting the center of the support shaft 19 of the rear wheel 18 to the center of the crankshaft 35.
The state is in the range of the angle of 40 degrees.

Next, the saddle post 21 with the saddle 20 attached to the upper end is screwed to the saddle post fixing mechanism 22 at the upper end of the saddle post tube 23 with a fixing screw 38.
Is loosened and housed in the saddle post tube 23, and the fastening screw 37 of the sheet fixing mechanism 24 at the upper end of the vertical pipe 12 is loosened to loosen the saddle post tube 23.
When the folding bicycle is stored inside the vertical pipe 12, the folding bicycle as shown in FIGS. 5 and 6 is folded and transported.

Further, from the state shown in FIGS. 5 and 6, the fastening screw 36 of the handle post fixing mechanism 27 at the upper end of the front fork 14 is loosened, and the handle post 26 having the handle 25 at the upper end is removed from the front fork 14. As shown in FIG. 7, the outer shape after folding is further reduced,
It is stored in a small place such as a coin locker.

Next, referring to FIGS. 8, 9 and FIG. 10, which shows a cross section of the front hinge portion 32, an embodiment of the bending control means for the hinge portion will be described. The front hinge portion 32 is a front connecting pipe 13 which is a front portion of the divided connecting frame pipe 13.
b and the middle connecting pipe 13a, which is a central portion, and the center connecting pipe 13a and the front connecting pipe 13b are connected to each other around the bending central axis 32c in the directions of arrows A and A around the bending central axis 32c. It can rotate and bend.
Similarly, the rear hinge portion 33 is connected to the rear communication pipe 13c which is the rear portion of the divided communication frame pipe 13.
And the middle communication pipe 13a, which is a central part, so that the middle communication pipe 13a and the rear communication pipe 13c can be rotated and bent about the bending center axis 33c around the bending center axis 33c.

The bend restricting means of the front hinge portion 32 is provided with a slidable front slider 40 made of a material having a large bending strength and being hardly deformed, corresponding to the front hinge portion 32 inside the connecting frame pipe 13. The slider 4 before this
0 has a screw hole 40a into which a tightening screw 42 that penetrates a long hole 44 of the front communication pipe 13b, which is the front part of the divided communication frame pipe 13, is screwed. Handle 4 integrated with screw 42
By moving 2a, the front slider 40 can slide within the range of the elongated hole 44.

The length and the position of the elongated hole 44 are such that the rear end portion 40b of the front slider 40 is slightly shifted from the front hinge portion 32 toward the head pipe 11 from a position where the vicinity of the longitudinal center of the front slider 40 overlaps the front hinge portion 32. It is preferable to be able to slide to the position deviated to the side. Further, by turning the handle 42a, the front connecting pipe 13b is formed between the inner end face of the handle 42a and the end face of the front slider 40 on the handle 42a side.
The sliding of the front slider 40 can be stopped by sandwiching the periphery of the long hole 44.

At the position where the front slider 40 is engaged with the front hinge portion 32, more specifically, as shown in FIG. 10, the front slider 40 is divided into the front connecting pipe 13b which is the front side of the divided connecting frame pipe 13 and the central portion. Since the front slider 40 is not deformed by restricting the position to engage with both of the middle communication pipes 13a, the bending operation of the front hinge portion 32 can be restricted. When the entire front slider 40 enters the front communication pipe 13b and moves to a position where it does not engage with the front hinge portion 32 to stop the front hinge portion 32, the restriction of the bending operation is released and the front hinge portion 32 becomes in a bendable state. Become.

As for the bending restricting means of the rear hinge part 33, similarly to the bending restricting means of the front hinge part 32, the slidable rear slider 41 made of a material having a large bending strength and being difficult to deform is provided with a rear hinge part. The handle 43 is provided inside the connecting frame pipe 13 divided corresponding to the handle 33.
The sliding and stopping are possible within the range of the long hole 45 of the middle connecting pipe 13a, which is the central portion of the connecting frame pipe 13 divided by a, and the rear slider 41 is moved to the rear end position of the long hole 45 by the handle 43a. When the rear slider 41 is moved to a position where the rear slider 41 is engaged with the rear hinge portion 33, the bending operation of the rear hinge portion 33 is restricted, and the elongated hole 45 is formed by the handle 43a.
When the rear slider 41 is moved to a position where the rear hinge portion 33 and the rear slider 41 do not engage with each other at the front end position, and the rear slider 41 is stopped, the restriction on the bending operation of the rear hinge portion 33 is released, and the rear hinge portion 33 can be bent.

Next, referring to FIG. 11 and FIG. 12 showing a cross section of a main part thereof, the connecting frame pipe 1 bent by two hinge portions of a front hinge portion 32 and a rear hinge portion 33 will be described.
An embodiment of the extension restricting means for restricting the extension operation of No. 3 will be described. The suction base 46 includes a concave ring-shaped chassis 47 made of a non-magnetic material such as aluminum, a ring-shaped yoke 49 made of a magnetic material such as iron, and a plurality of columnar permanent magnets 4.
8a, a permanent magnet 48b is embedded and integrated with an adhesive or the like, and an end screw 19a on the support shaft 19 of the rear wheel 18 is provided on the right side 15a, which is one of the rear ends of the rear side frame 15, which branches right and left. Is mounted on the nut with a nut 19b, and an end surface opposite to the mounting surface is provided with a plurality of permanent magnets 48a and permanent magnets 48b.
Is formed on the suction surface 46a, which is flush with the end surface of the suction surface 46a. The adsorbent 50 has a concave ring shape made of a magnetic material such as iron and has a left side 1 which is one of lower ends of the front fork 14 branched to the left and right.
4b, a nut 17b is attached to a screw 17a at the end of the support shaft 17 of the front wheel 16.

In this state, when the connecting frame pipe 13 is bent by the two hinge portions, the folding bicycle is folded as shown in FIG.
6a and the end face 50a of the adsorbent 50 are adsorbed and fixed by a plurality of permanent magnets 48a and 48b in the adsorbing base 46. Since the folded state is maintained by the suction fixing, the extension operation of the connecting frame pipe 13 bent by the two hinge portions can be restricted. Also,
In order to extend the folded bicycle, the front wheel 16 and the rear wheel 18 are held by hand and a force is applied so as to widen the gap, and the suction between the suction base 46 and the suction material 50 is removed, whereby the front hinge portion 32 and the rear hinge portion 32 are removed. The restriction on the extension operation of the connecting frame pipe 13 bent with the portion 33 is released.

[0032]

As described above, according to the present invention, a connecting frame pipe for connecting a head pipe and a standing pipe,
A front fork which is rotatably attached to the head pipe, the upper end of which is connected to the handle post and the lower end of which supports the front wheel, and a rear frame which supports the rear wheel behind the standing pipe are provided. In a bicycle having a crankshaft mounting means provided near a vertical pipe, two hinge portions are provided so as to divide the connecting frame pipe into three parts. The rear frame and front wheel are arranged side by side by bending the connecting frame pipe by the hinge portion, and the position of the handle post as viewed from the side connects the center of the support shaft of the rear wheel to the center of the crankshaft. Because it is within an angle range of ± 40 degrees with the axle center of the rear wheel as the vertex relative to the extension, when using a bicycle, a long wheelbase is secured and The tires are improved, and a comfortable ride can be maintained.In addition, standard parts can be used for the entire wheels, making it possible to manufacture them at low cost.When folding, the body with a long wheelbase can be folded small, and the handle post is held by hand. Folded, side-by-side wheels move along the ground for easy transport.

In addition, there is provided a bending restricting means for restricting or canceling the bending operation of the communication frame pipe by the hinge part, and restricting or restricting the extension operation of the communication frame pipe bent by the hinge part. Is provided, sufficient rigidity in the lateral direction of the vehicle body can be ensured when the bicycle is running, the form of folding and transporting is stabilized, and the folded bicycle can be held by hand with the handle post. It can be transported by pulling it like a cart, and can be easily transported with a reduced load on the hand.

[Brief description of the drawings]

FIG. 1 is a side view of a folding bicycle according to an embodiment of the present invention when it is possible to ride.

FIG. 2 is a plan view of the folding bicycle.

FIG. 3 is a side view showing a folding process of the folding bicycle.

FIG. 4 is a side view showing a folding process of the folding bicycle.

FIG. 5 is a side view showing the folding bicycle at the time of folding.

FIG. 6 is a plan view showing the folding bicycle at the time of folding.

FIG. 7 is a plan view showing the folding bicycle in a stored state after being folded.

FIG. 8 is a side view showing a connecting frame pipe portion of the folding bicycle.

FIG. 9 is a plan view showing a connecting frame pipe portion of the folding bicycle.

FIG. 10 is a partially cutaway main part explanatory view showing a front hinge portion of a communication frame pipe portion of the folding bicycle.

FIG. 11 is a plan view showing the folded state of the folding bicycle when the extension restricting means is provided.

FIG. 12 is a plan view of a partially cut-away main part when the folding bicycle is equipped with extension restricting means.

FIG. 13 is a side view showing a state in which a conventional folding bicycle can be ridden.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Head pipe 12 Standing pipe 13 Connecting frame pipe 14 Front fork 15 Rear frame 16 Front wheel 17 Support shaft 18 Rear wheel 19 Support shaft 20 Saddle 21 Saddle post 25 Handle 26 Handle post 28 Crank 32 Front hinge part 33 Rear hinge part 34 Crank Shaft mounting means 35 Crankshaft

Claims (2)

[Claims] 1. A folding bicycle capable of folding a vehicle body, comprising: a connecting frame pipe for connecting a head pipe and an upright pipe; and an upper end rotatably attached to the head pipe connected to a handle post and connected to a lower end. A bicycle comprising: a front fork that supports a front wheel; and a rear frame that supports a rear wheel behind the standpipe, and crankshaft mounting means provided near the standpipe. 2 to split the pipe into 3
A hinge portion is provided at a location, and when viewed from the side, the projection line of the center axis of the hinge exhibits a C shape, and the rear wheel and the front wheel are arranged side by side by bending of the communication frame pipe by the hinge portion. The position of the handle post as viewed from the side is within an angle range of ± 40 degrees with the apex center of the rear wheel as the apex with respect to the extension line connecting the center of the axle of the rear wheel and the center of the crankshaft. Folding bicycle featuring. 2. A bending restricting means for restricting or releasing the bending operation of the communication frame pipe by the hinge portion, and restricting or restricting the extension operation of the communication frame pipe bent by the hinge portion. 2. The folding bicycle according to claim 1, further comprising an extension restricting means for canceling the condition.