JP4875114B2 - bicycle - Google Patents

Description

  The present invention relates to a bicycle that is deformed from a traveling form to a carrying form by folding some of the constituent members or moving them to each other to make them compact.

  Bicycles have been manufactured for over 100 years and are widely used. Nowadays, with the growing environmental orientation and health orientation, bicycles with a small environmental burden and moderate physical exercise are being reevaluated and favored. In modern times, there are various means of transportation such as automobiles. Bicycles are sometimes used as easy vehicles that can be used on the road, or as a means of filling the “gap” between public transportation systems. There is a demand for bicycles.

  Such a bicycle is preferably lightweight and can be compacted by folding or moving some of the components to each other.

  Patent Document 1 discloses a folding bicycle that is lightweight, can be folded to the size of a handbag or a carry bag, and has a short time required for folding and unfolding. However, this folding bicycle is not preferable in that it carries a carrying method in which the entire weight of the bicycle is applied to the carrying person, such as carrying it in a carry bag when carrying it. Moreover, since it is such a carrying method, it has the problem at the time of driving | running | working that the tire diameter is made small by pursuing the compactness at the time of folding too much, and it is difficult to balance right and left.

Patent Document 2 discloses a bicycle in which some components can be folded or moved relative to each other to be compact and deformed into a carrying form, and the bicycle is provided with a caster frame and casters in the vicinity of the rear wheel. When the bicycle is transformed into a carrying form, the rotation axis direction of the caster and the axial direction of the wheel are perpendicular to each other. Can be moved. Although this bicycle reduces the weight burden on the carryer in this way, the caster frame to which the caster is attached is not foldable, and the caster frame cannot be stored compactly during travel. This may cause troubles such as catching bumps and bumps on the ground and other objects while running, and is not preferable from the aspect of bicycle aesthetics (style surface).
Furthermore, since the bicycle frame of the bicycle is inevitably wide for bicycle parking stability, the area occupied by the grounding of the bicycle may become large and annoying the surroundings when carrying the bicycle.

JP 2005-335673 A Japanese Patent No. 4201717

  The present invention has been made to address the above problems. A bicycle that is deformed from a running configuration to a carrying configuration by folding or moving components to each other to be compact, and includes a device that facilitates carrying, and the bicycle is stored compactly in the traveling configuration. provide.

The bicycle of the present invention is a bicycle that can be transformed from a running form to a carrying form by folding or moving components constituting the bicycle to make them compact.
A frame main body that extends in the front-rear direction of the bicycle in the traveling form and is reduced in this direction in the carrying form and is supported by the wheels disposed at the front and rear of the bicycle, a caster frame that supports the bicycle in the carrying form, and an upper rear wheel Equipped with a loading platform provided in
In the caster frame, one end of a linear upper frame and a V-shaped lower frame are connected to each other by a connecting portion so as to be rotatable, and the other end of the lower frame is centered on a rotation support portion provided near the rear wheel shaft. Is attached to the bicycle at the rotation support portion and the slide support portion so that the upper frame can slide at the slide support portion provided on the loading platform,
Each of the other end of the upper frame and the end extending from the V-shaped bent portion of the lower frame has at least one caster,
The caster frame can be folded by rotating the connecting portion, is in a folded state in the traveling form, is unfolded in the carrying form, and is the same in the state in which the caster frame is unfolded. Located on a plane, the plane is perpendicular to the front-rear direction of the bicycle, and the caster is located at the rearmost position in the entire bicycle. In the carrying form, the rotation axis direction of the caster and the height direction of the bicycle coincide with each other. In this form, the bicycle is transported by landing only the casters and rolling on the ground.

The caster frame is provided in a pair with a bicycle rear wheel interposed therebetween, and the casters are provided on one side of the pair.
The pair of caster frames provided with a landing auxiliary portion on the side opposite to the side having the casters, and the sum of the number of casters and the number of landing auxiliary portions is 3 or more, The caster and the landing assistance part are located on the plane, and the bicycle is self-supporting by landing only the caster and the landing assistance part.

  The bicycle is characterized in that a handle is provided on a front fork to which a front wheel is attached.

Since the bicycle of the present invention includes a caster, the carryer can easily move the bicycle by transforming the bicycle into a carrying form and rolling the caster on the ground.
Since the caster frame to which the caster is attached can be folded, the caster frame can be stored compactly during traveling.
Since the caster frame is stored in a compact manner during traveling, the problems of previously known caster frames, such as catching unevenness on the ground, curbs with steps, and other objects during traveling are solved. Furthermore, the aesthetics of the bicycle (the style) will look better than previously known caster frames.
Furthermore, because of the bicycle parking stability, the conventionally known (Patent Document 2) caster frame is inevitably wide, so that the area occupied by the grounding of the bicycle becomes large and annoying the surroundings when carrying the bicycle. In some cases, the caster frame can be designed so that there is no such defect.

It is a side view which shows the driving | running | working form of the bicycle of 1st Embodiment. It is a side view which shows the carrying form of the bicycle of 1st Embodiment. It is a state figure of the caster frame in the running mode of the bicycle of the first embodiment. It is a state figure of the caster frame in the middle of deformation from the running form of the bicycle of the first embodiment to the carrying form. It is a state figure of the caster frame in the carrying form of the bicycle of a 1st embodiment. It is a state figure of the caster frame in the running form of the bicycle of a 2nd embodiment. It is a state figure of a caster frame in the middle of modification from a run form of a bicycle of a 2nd embodiment to a carrying form. It is a state figure of the caster frame in the carrying form of the bicycle of a 2nd embodiment. It is a figure which shows a landing assistance part. It is a perspective view of a caster frame.

(First embodiment)
One embodiment of the bicycle of the present invention that can be transformed from a running configuration to a carrying configuration will be described with reference to FIGS. 1, 2, 3, 4, and 5. FIG. 1 is a side view showing a traveling mode of a bicycle according to the present invention. FIG. 2 is a side view showing a bicycle carrying form of the present invention. FIG. 3 is an enlarged view around the caster frame of FIG. FIG. 5 is an enlarged view around the caster frame of FIG. 4 shows an intermediate state in which the caster frame is deformed from the state of FIG. 3 to the state of FIG.

  The overall structure of the bicycle will be described with reference to FIG. 1 showing the traveling form of the bicycle. Hereinafter, unless otherwise specified, the front-rear direction, the left-right direction, and the up-down direction (height direction) are in a state straddling the bicycle. The bicycle has a frame body 3 that extends in the front-rear direction of the skeleton and is supported by a steering wheel 1 that is a front wheel and a drive wheel 2 that is a rear wheel. The frame body 3 has a handle at its front end. The shaft 4 is connected to a head tube 5 that rotatably holds the shaft 4 by welding or the like. A front fork 6 facing the steering wheel 1 extends from the lower end of the handle shaft 4, and the steering wheel 1 is pivotally supported at the lower end of the front fork 6. As the steering wheel 1 and the drive wheel 2 described later, a small diameter wheel having a diameter of about 30 to 40 cm is preferably used.

  A rod-like handle 7 extending in a substantially left-right direction is attached to the upper end portion of the handle shaft 4.

  A lower frame 8 is coupled to the rear tube 3a of the frame main body 3 to be described later by welding or the like in the main body 9 below the frame main body 3. A rear fork 10 facing the drive wheel 2 is extended obliquely downward from the rear end position of the rear tube 3a, and the drive wheel 2 is pivotally supported at the lower end of the rear fork 10. Although not shown in the drawing, it is a matter of course that the steering wheel 1 and the drive wheel 2 have spokes.

  Although not shown, a transmission device for transmitting a rotational force obtained by stepping on a pedal described later to the drive wheel 2 is attached to the main body portion 9 of the lower frame 8. The transmission device has a general configuration and includes a pair of chain wheels and a chain hung on the pair. The front chain wheel (hereinafter referred to as a front chain wheel) is driven by the steering wheel 1. The rear chain wheel (hereinafter referred to as the rear chain wheel) is pivotally supported by the lower frame in the middle of the wheel 2 and is coaxial with the drive wheel 2 and can be rotated in the forward direction integrally with the drive wheel 2. is there.

  Cranks are attached to both shaft ends of the front chainwheel. The left crank and the right crank extend in directions opposite to the radial direction of the front chainwheel, and a pedal is provided at the tip.

  A saddle support frame 11 extends upward from the frame body 3, and a saddle 12 is attached to the upper end of the saddle support frame 11 above the front chainwheel.

  In addition to what has been described above, illustrations are omitted, but it is a matter of course that there are provided basic members of the bicycle, such as brakes and lights. In addition, casters 13 and 14 and a handle 40 that are used when the bicycle is transformed into a carrying form and transported are provided.

  Next, with reference to FIGS. 1 and 2, a structure related to the deformation of the bicycle from the traveling form (FIG. 1) to the carrying form (FIG. 2) will be described. The frame body 3 includes tubes 3a and 3b. Each of these tubes has a structure in which two metal elongated members having a rectangular cross section are arranged in parallel, and a holder 15 for inserting a saddle support frame, which will be described later, is interposed between the two elongated members. It passes almost vertically. (The state in which the two are arranged in parallel is not shown.) The elongated member of the tube 3a is thicker than the elongated member of the tube 3b. As shown in FIG. 1, the frame main body has a structure in which a thick tube on the rear side (hereinafter referred to as a rear tube) 3a is followed by a thin tube on the front side (hereinafter referred to as a front tube as appropriate) 3b. 3 is configured. Specifically, the front tube 3b passes through the rear tube 3a, and the rear end surface of the front tube 3b is located behind the rear end of the rear tube 3a. The head tube 5 is coupled to the front tube 3b. Although not shown, a locking device is provided in the vicinity of the rear end of the rear tube 3a to connect the front tube 3b and the rear tube 3a. In the traveling state of the bicycle shown in FIG. 1, the lock is applied from the vicinity of the rear end of the rear tube 3a to the vicinity of the rear end of the front tube 3b, and the rear tube 3b protruding from the rear end of the rear tube 3a. The end face is prohibited from being further displaced rearward. That is, in the traveling mode of the bicycle, the position of the rear end surface of the front tube 3b in the front-rear direction of the bicycle is defined by fixing with the lock.

  When the bicycle is deformed from the traveling configuration (FIG. 1) to the carrying configuration (FIG. 2), the coupled state of the front tube 3b and the rear tube 3a is released. That is, the above-mentioned state in which the lock is applied from the vicinity of the rear end of the rear tube 3a to the vicinity of the rear end of the front tube 3b is released, and the rear end surface of the front tube 3b is more than the position in the travel mode. Allow backward displacement. Thereby, the space | interval of the steering wheel 1 and the drive wheel 2 can be narrowed, and this bicycle can be made compact in the front-back direction. FIG. 2 shows a carrying form of the bicycle in which the rear end surface of the front tube 3b is actually displaced rearward from the position in the running form, and the distance between the steering wheel 1 and the driving wheel 2 is narrowed. When the locking device is released, the rear end surface of the front tube 3b moves forward and enters the rear tube 3a, or further moves forward and the front tube 3b is moved to the rear tube 3a. In order to prevent the slipping out of the stopper tube 16, the stopper 16 is provided and designed so that the width in the vicinity of the rear end surface of the front tube 3 b is larger than the inner width of the rear tube 3 a.

  In the transition from the traveling configuration shown in FIG. 1 to the carrying configuration shown in FIG. 2, the present bicycle has a frame body extending in the front-rear direction of the bicycle in the traveling configuration, and in the carrying configuration the frame body is reduced in this direction. Yes.

  As described above, the holder 15 passes substantially vertically between the two metal elongated members arranged in parallel to form the rear tube 3a. The saddle support frame 11 includes tubes 11a and 11b, which are elongated members having different thicknesses. 1 is joined as a saddle support frame 11 by connecting an upper thin tube (hereinafter appropriately referred to as a top tube) 11b to a lower thick tube (hereinafter appropriately referred to as a base tube) 11a in FIG. Yes. Each of the tubes 11a and 11b is formed by molding a pipe made of metal or glass fiber resin or carbon fiber resin. In the traveling mode of the bicycle, the saddle support frame 11 is attached by inserting the base tube 11a into the holder 15 from above. The inserted base tube 11 a is fixed to the holder 15 by the lock mechanism 17. A saddle 12 is fixed to the upper end of the top tube 11b, and the top tube 11b is fixed to the base tube 11a by a lock mechanism 18. The top tube 11b can be pulled out of the base tube 11a while the height of the saddle 12 can be adjusted by releasing the lock mechanism 18. When the bicycle is transformed from the running configuration to the carrying configuration, the lock mechanism 17 is released, the base tube 11a is removed from the holder 15, and the saddle support frame 11 is removed. When the base tube 11a is inserted into the holder 15 from below the holder 15 and fixed by the lock mechanism 17, the saddle support frame 11 and the saddle 12 are housed as shown in FIG.

As shown in FIG. 1, the handle shaft 4 includes a first portion 4a connected to the front fork 6 at the lower end, a second portion 4b coupled to the front fork 6 by a lock mechanism 19, and a third portion with the handle 7 fixed to the upper end. 4c. The third portion 4c having a small diameter on the upper side is inserted into the second portion 4b having a large diameter on the lower side, and is fixed by the lock mechanism 20. The height of the handle 7 is adjusted by releasing the lock mechanism 20 and adjusting the degree of insertion.
When the bicycle is transformed from the running configuration to the carrying configuration, the lock mechanism 19 is released, and the portion above the lock mechanism 19 is stored upside down as shown in FIG.

Next, members such as casters 13 and 14 used when the bicycle is transported in the carrying form shown in FIG. 2 will be described.
FIG. 3 is an enlarged view of the vicinity of the drive wheel 2 in FIG. As shown in FIG. 3, the loading platform 21 is fixed to the rear fork 10 by welding or the like, and is positioned above the drive wheels 2. Further, the caster frame 22 having a structure in which the linear upper frame 23 and the V-shaped lower frame 24 are connected by the connection portion 25, the lower frame 24 rotates around the rotation support portion 26 near the rear wheel shaft end. The upper frame 23 is attached to the bicycle at both support portions so that the upper frame 23 can slide at the slide support portion 27 at the rear end of the loading platform 21. A caster 13 is attached to the end of the other end of the upper frame 23, and a caster 14 is attached to an end of the lower frame 24 that extends from the V-shaped bent part.
FIG. 5 is a diagram of the relevant part in the carrying configuration of the bicycle, and FIG. 4 is a diagram illustrating an intermediate state of the relevant part when the traveling configuration (FIG. 3) is transformed to the carrying configuration (FIG. 5). . As shown in FIGS. 3, 4, and 5, the caster frame 22 can be folded at the connection portion 25 between the upper frame 23 and the lower frame 24, and is in a folded state (FIG. 3) and an intermediate state (FIG. 4). The unfolded state (FIG. 5) can be taken. These states are the development process of the caster frame 22 in this order. The slide support portion 27 is a bolt or the like, and is fixed to the rear end portion of the loading platform 21 through a gap 28 provided in the upper frame. In the process of developing the caster frame 22, the slide support portion 27 is a gap. By moving 28, the position of the slide support portion 27 viewed from the upper frame 23 changes. Here, of course, the slide support portion 27 remains fixed to the loading platform 21.

  In the unfolded state of the caster frame 22 shown in FIGS. 5 and 2, the rotation axis direction of the casters 13 and 14 is the height direction of the bicycle. Therefore, the rotation axis direction of the casters 13 and 14 is perpendicular to the axial direction of the driving wheel 2 that is the rear wheel. Further, the rotation axis direction of the casters 13 and 14 is also perpendicular to the axial direction of the steering wheel 1 which is the front wheel.

  A cylinder 29 is movably passed through one of the V-shaped bent portions of the lower frame 24, and a spring 41 is attached to connect the cylinder 29 and the upper frame 23. In the developing process of the caster frame 22, the position of the cylinder 26 in the lower frame 24 moves from the position shown in FIG. 3 to the position shown in FIG. It enters and hides. This has the effect of preventing the caster frame 22 in a deployed state from reversing the deployment process. Therefore, in the bicycle carrying form, the deployed state of the caster frame 22 shown in FIG. 5 is stably maintained. In order to reverse the unfolding process and return the caster frame 22 to the folded state, it is necessary to shift the cylinder 29 downward by hand or the like to bring the connecting portion 25 out of the cylinder 29.

  In the state where the caster frame 22 is folded (FIG. 3), the state is maintained by the spring 41 supporting the lower frame 24.

  The caster frame 22 is substantially bilaterally symmetric, but the casters 13 and 14, the cylinder 29, and the spring 41 are attached only to the left side (that is, the side visible in FIG. 3). As shown in FIG. 9, landing assisting portions 22 a are provided on the right side of the caster frame 22 at positions corresponding to the casters 13 and 14, respectively. Accordingly, a total of two landing assisting portions 22a are provided (refer to the similar landing assisting portion 33a in the bicycle of the second embodiment to be described later because it is shown in FIG. 10). Here, the landing assisting portion 22a may simply be a projection structure of the caster frame, or an independent member may be attached. When the bicycle is in the carrying configuration shown in FIGS. 2 and 5 (and therefore when the caster frame 22 is in the unfolded state), the two casters 13 and 14 and the two landing assisting portions 22a are: Located on the same plane. The plane is perpendicular to the front-rear direction of the bicycle and behind the drive wheel 2, and the two casters 13, 14 and the two landing assist portions 22a are the most in the entire bicycle. Located behind. Therefore, in this bicycle carrying form, as shown in FIG. 2, the two casters 13, 14 and the two landing assisting portions 22a can be landed on the ground (in FIG. 2, the landing assisting portion 22a is (Not visible), this bicycle can be made independent. In this state, only the two casters 13 and 14 and the two landing assist portions 22a are landed on the ground in the entire bicycle.

  Other similar configurations may include a caster, a cylinder, and a spring attached to the right side, or both sides, and the caster landing situation is similar to the above.

  As shown in FIG. 2, a handle 40 is attached to the front fork 6 by welding or the like.

A method for transporting the bicycle will be described.
First, the above-described work for narrowing the distance between the steering wheel 1 and the drive wheel 2 and the work for storing the saddle support frame 11 and the handle shaft 4 are performed on the bicycle in the running mode shown in FIG.
Next, as described above, the two casters 13 and 14 and the two landing assisting portions 22a are landed, and the bicycle is made independent as shown in FIG.
The bicycle is tilted with the handle 40, and the two landing assisting portions 22a are floated so that only the two casters 13 and 14 of the bicycle are landed.
In this state, by pulling the handle 40 and walking, the two casters roll on the ground, and the bicycle can be easily moved and transported.

  When the bicycle is transported, the rotation axis direction of the casters 13 and 14 is the height direction of the bicycle. Therefore, the rotation axis direction of the casters 13 and 14 is perpendicular to the axial direction of the driving wheel 2 that is the rear wheel.

  Since the caster frame 22 is compactly folded and stored in the traveling mode, the bicycle has a conventionally known caster frame that catches irregularities on the ground, stepped curbs, and other objects while traveling. Problem is solved. Furthermore, it also looks better than the previously known caster frame in terms of aesthetics in terms of the shape of the bicycle.

  In the above description, the number of casters is 2 and the number of landing assistance parts is 2. However, the present invention is not limited to this. In the state where the number of casters is 2 or more and (number of casters) + (number of landing auxiliary portions) is 3 or more and the caster frame 22 is unfolded, the casters and the landing auxiliary portions are on the same plane. In the same manner as described above, the bicycle in the carrying form can be made independent by landing only the casters and the landing auxiliary part on the ground, and only the casters are landed on the ground and rolled on the ground. Thus, it is only necessary that the bicycle can be transported in a state in which the rotation axis direction of the caster coincides with the height direction of the bicycle.

  In addition, in order to park this bicycle in a running mode, a general one-sided stand can be attached near one end of the rear wheel axle.

(Second Embodiment)
Another embodiment of the bicycle of the present invention will be described. This embodiment is the same as the first embodiment except for portions related to the caster frame described below.

Parts related to the caster frame will be described with reference to FIGS. 6, 7, 8, and 10.
FIG. 6 is an enlarged view of the vicinity of the drive wheel 2 in the traveling mode of the bicycle. As shown in this figure, a caster frame 33 having a structure in which an upper frame 30 and a lower frame 31 are connected by a connection portion 32 can rotate the lower frame 31 around a rotation support portion 34 near the rear wheel shaft end. In addition, both support portions are attached to the bicycle so that the upper frame 30 can slide on the slide support portion 36 at the rear end of the loading platform 35. A caster 37 is attached to the end of the upper frame 30, and a caster 38 is attached to the end of the lower frame 31. FIG. 7 is a view of the relevant part in the carrying form of the bicycle, and FIG. 8 is a diagram showing an intermediate state of the place when the traveling form (FIG. 6) is transformed to the carrying form (FIG. 8). . As shown in FIGS. 6, 7, and 8, the caster frame 33 can be folded at the connection portion 32 between the upper frame 30 and the lower frame 31, and is in a folded state (FIG. 6) and an intermediate state (FIG. 7). ), The unfolded state (FIG. 8) can be taken. These states are the developing process of the caster frame 33 in this order. FIG. 10 is a perspective view of the caster frame 33 in an unfolded state as seen from the rear and diagonal of the bicycle.

  Unlike the first embodiment, in this embodiment, the slide support portion 36 fixed to the rear end portion of the loading platform 35 includes a ring portion having a variable angle. In FIG. 6, FIG. 7, and FIG. 8, this ring portion is illustrated as the slide support portion 36. The upper frame 30 passes through the ring portion, and in the process of deploying the caster frame 33 shown in these drawings, the upper frame 30 slides on the ring portion, and at the same time, the ring portion changes its angle.

A cylinder 39 is movably passed through the lower frame 31. As in the first embodiment, a spring connecting the cylinder 39 and the upper frame 30 may or may not be attached. In the process of deploying the caster frame 33, the cylinder 39 in the lower frame is moved manually from the position shown in FIG. 6 to the position shown in FIG. Enter and hide.
This has the effect of preventing the caster frame 33 in the expanded state from reversing the expansion process. Therefore, in the bicycle carrying form, the deployed state of the caster frame 32 shown in FIG. 8 is stably maintained. In order to reverse the unfolding process and return the caster frame 33 to the folded state, it is necessary to shift the cylinder 39 downward by hand to bring the connecting portion 32 out of the cylinder 39.

  As shown in FIG. 10, the caster frame 33 is substantially bilaterally symmetric, but the casters 37 and 38 and the cylinder 39 are attached only to the left side (that is, the side visible in FIG. 6). When attaching a spring, attach the spring only to the left side. On the right side of the caster frame 33, landing assistance portions 33a are provided at positions corresponding to the casters 37 and 38, respectively. Here, the landing assisting part 33a may be simply a projection structure of the caster frame as shown in FIG. 10, or an independent member may be attached. When the bicycle is in the carrying configuration shown in FIGS. 8 and 10 (and therefore when the caster frame 33 is in the unfolded state), the two casters 37 and 38 and the landing assisting portion 33a are on the same plane. Located on the top. The plane is perpendicular to the front-rear direction of the bicycle and behind the drive wheel 2, and the two casters 37 and 38 and the two landing assist portions 33a are the most in the entire bicycle. Located behind.

Other similar configurations may include a caster, a cylinder, and a spring attached to the right side, or both sides, and the caster landing situation is similar to the above.
Further, in the above, the cylinder 39 is used to brake and fix the rotation of the connecting portion between the upper frame 30 and the lower frame 31 in the carrying form, but the connecting portion is not limited to this as another similar configuration. Various methods for braking and fixing the rotation are conceivable.
For example, a small-diameter pipe is attached in parallel to each frame by welding or the like in each of a portion close to the connection portion 32 of the upper frame 30 and a portion close to the connection portion 32 of the lower frame 31, and the caster frame 33 is developed. Sometimes, if a single round bar is slid and inserted so as to pass over both of the two small-diameter pipes, a braking and fixing effect similar to that of providing the cylinder 39 can be obtained.

  The method for transporting the bicycle is the same as in the first embodiment.

  Since the bicycle of the present invention can be transformed into a compact form suitable for carrying and is equipped with a caster that facilitates carrying, it can be used as a means for filling a gap in a public transportation system or as a simple vehicle at a destination. Expected to be widely used.

1 Steering wheel (front wheel)
2 Drive wheels (rear wheels)
3 frame body 3a rear tube 3b front tube 4 handle shaft 4a first part 4b second part 4c third part 5 head tube 6 front fork 7 handle 8 lower frame 9 body part 10 rear fork 11 saddle support frame 11a base tube 11b top Tube 12 Saddle 13 Caster 14 Caster 15 Holder 16 Stopper 17 Lock mechanism 18 Lock mechanism 19 Lock mechanism 20 Lock mechanism 21 Loading platform 22 Caster frame 22a Landing assisting portion 23 Upper frame 24 Lower frame 25 Connection portion 26 Rotation support portion 27 Slide support portion 28 Clearance 29 Cylinder 30 Upper frame 31 Lower frame 32 Connection portion 33 Caster frame 33a Landing auxiliary portion 34 Rotation support portion 35 Loading platform 36 Slide support portion 37 Casters 38 Yasuta 39 cylinder 40 grip 41 spring 42 ground

Claims (4)

In a bicycle that can be transformed from a running form to a carrying form by folding or moving the components that make up the bike to each other to make it compact,
A frame main body that extends in the front-rear direction of the bicycle in the traveling form, is reduced in this direction in the carrying form and is supported by wheels disposed at the front and rear of the bicycle, and a caster frame that supports the bicycle in the carrying form; With a loading platform provided above the rear wheel,
In the caster frame, one end of a linear upper frame and a V-shaped lower frame are connected to each other by a connecting portion so as to be rotatable, and the other end of the lower frame is centered on a rotation support portion provided near the rear wheel shaft. And is attached to the bicycle at the rotation support portion and the slide support portion so that the upper frame can slide at a slide support portion provided on the cargo bed,
Each of the other end of the upper frame and an end extending from the V-shaped bent portion of the lower frame has at least one caster,
The caster frame can be folded by rotating the connecting portion, is folded in the traveling form, and is unfolded in the carrying form,
When the caster frame is deployed, the casters are located on the same plane, the plane is perpendicular to the front-rear direction of the bicycle, and the casters are located rearmost in the entire bicycle,
In the carrying mode, the rotation axis direction of the caster coincides with the height direction of the bicycle, and the bicycle is transported by landing only the caster and rolling on the ground in this mode.   The bicycle according to claim 1, wherein a pair of the caster frames are provided across the rear wheel, and the casters are provided on one side of the pair.   The pair of caster frames has a landing assisting portion on the side opposite to the side having the casters, and the sum of the number of casters and the number of landing assisting portions is 3 or more. The bicycle according to claim 2, wherein the caster and the landing assisting part are positioned on the plane, and the bicycle is self-supporting by landing only the caster and the landing assisting part.   4. The bicycle according to claim 1, wherein the bicycle includes a handle on a front fork to which a front wheel is attached.

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