Bicycle frame extension tool and bicycle

Abstract

To provide a bicycle frame extension tool making it possible to adjust a saddle position so that the saddle position gets higher than a length of a seat post, and a bicycle.SOLUTION: A bicycle frame extension tool 2 includes an extension vertical pipe 60 capable of being inserted into a vertical pipe 21 into which a seat post 12 is inserted supporting a saddle 10 in order to support the saddle 10, and capable of having the seat post 12 inserted from the upper part, and a support shaft 61 having one end coupled to the upper part of the extension vertical pipe 60, having the other end coupled to a stationary part 25a formed in a region of a seat stay 25 near a rear wheel 41, forming a triangle structure together with the vertical pipe 21 into which the extension vertical pipe 60 is inserted, and the seat stay 25.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a bicycle frame extension used to adjust the height of a saddle, and to a bicycle. [Background technology]

[0002] The bicycle saddle is fixed to one end of a cylindrical seat post, the other end of which is inserted into a standpipe located in the center of the frame, and is fixed to the bicycle frame by reducing the diameter of the upper part of the standpipe using a tightening mechanism located at the top of the standpipe. Furthermore, by loosening the tightening mechanism, the seat post becomes extendable relative to the standpipe, and the position of the saddle can be adjusted by extending the seat post to suit the user's height and tightening the tightening mechanism.

[0003] However, in this case, the range in which the saddle position can be raised is limited to the length of the seat post. Therefore, it is difficult to raise the saddle position beyond the length of the seat post. A conventional technique for adjusting the saddle to a higher position is proposed in Patent Document 1. Patent Document 1 discloses that by inserting an extension post into the frame of the unicycle and then inserting the saddle post into the extension post, the same unicycle can be used for both children's and adults' unicycles, even if the inseam lengths are significantly different. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 1-89291 Summary of the Invention [Problem to be solved by the invention]

[0005] The seat post of a two-wheeled bicycle extends obliquely relative to the vertical direction. For such a two-wheeled bicycle, if an extension post is inserted into the standpipe to raise the saddle, as in the technology described in Patent Document 1, a large load is likely to be applied to the connection between the standpipe and the extension post, and in the worst case, the extension post may be deformed. This makes it difficult to raise the saddle by extending the length of the standpipe. Thus, in the past, even bicycles used in the early grades of elementary school could be used by extending the seat post and raising the saddle as the user grew. However, as the user grew, it became difficult to raise the saddle beyond the length of the seat post, resulting in difficulty in continuing to use the bicycle used in the early grades of elementary school.

[0006] SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and to provide a bicycle frame extension that allows the saddle position on a bicycle to be adjusted higher than the length of the seat post, and a bicycle frame extension. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention has the following configuration.

[0008] (1) A cylindrical extension standpipe (e.g., extension standpipe 60) into which a seat post (e.g., seat post 12) supporting a saddle (e.g., saddle 10) can be inserted and which can be inserted into a standpipe (e.g., standpipe 21) supporting the saddle, and into which the seat post can be inserted from above; A bicycle frame extension device comprising: a support shaft (e.g., support shaft 61) having one end connected to the top of the extension standpipe and the other end connected to a predetermined portion of the frame body, the support shaft forming a triangular structure with the standpipe into which the extension standpipe is inserted and the frame body.

[0009] According to (1), by inserting the extension standpipe into the standpipe, the length of the standpipe can be extended, allowing the saddle to be adjusted to a higher position. Furthermore, a support shaft is positioned between the top of the extension standpipe and a predetermined portion of the frame body, forming a triangular structure. This allows the load on the extension standpipe due to the user's weight when using the bicycle to be distributed, more reliably preventing deformation of the extension standpipe. In this way, it is possible to adjust the position of the bicycle saddle to be higher than the length of the seat post.

[0010] (2) In paragraph (1), Two support shafts are connected to the upper part of the extension vertical pipe, The other ends of the two support shafts are connected to the frame body near both sides of the rear wheel rotation axis, forming a bicycle frame extension.

[0011] According to (2), because the two support shafts support the extension standpipe from the rear wheel side, it is possible to reduce the load on the extension standpipe at its connection with the standpipe, which more reliably prevents the extension standpipe from being deformed by the load imposed on it by the user's weight when using the bicycle.

[0012] (3) In paragraph (2), The support shaft is rotatably connected to the extension standpipe.

[0013] According to (3), the support shaft is rotatable relative to the extension standpipe, allowing the other end of the support shaft to move. This makes it easier to position the other end of the support shaft at the connection point with the frame body, reducing the workload required to install the bicycle frame extension.

[0014] (4) A bicycle frame extension device according to (1) to (3), A bicycle equipped with a connecting portion (for example, a fixed portion 25a) that connects to the other end of the support shaft.

[0015] According to (4), it becomes possible to change the shape of the bicycle to suit the user's physical growth. [Effects of the Invention]

[0016] According to the present invention, it is possible to provide a bicycle frame extension device and a bicycle that allow the position of the saddle on a bicycle to be adjusted higher than the length of the seat post. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a side view showing the schematic configuration of a bicycle 1 according to one embodiment of the present invention. [Figure 2] 1 is a perspective view showing the appearance of a bicycle frame extension 2 of a bicycle 1 according to an embodiment of the present invention. [Figure 3] 1 is a side view showing a state in which a bicycle frame extension 2 and a saddle 10 are attached to a bicycle 1 according to an embodiment of the present invention. [Figure 4] 10 is an explanatory diagram showing the configuration of a modified example of a bicycle frame extension 2 for a bicycle 1 according to an embodiment of the present invention. FIG. [Figure 5] 10 is a side view showing a modified example of the bicycle frame extension 2 attached to the frame body 20. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0019] <Bicycle 1 Configuration> 1 is a side view showing the schematic configuration of a bicycle 1 according to one embodiment of the present invention. The bicycle 1 includes a saddle 10, a seat post 12, a frame body 20, a handlebar 30, a front fork 31, a handle stem 32, a front wheel 40, a rear wheel 41, a gear crank 50, a crank 51, pedals 52, a freewheel 53, and a chain 54.

[0020] The saddle 10 is a member on which a user sits. The seat post 12 is a long, cylindrical member with the saddle 10 attached to one end. There are two types of seat posts 12: those that are attached directly to the frame body 20, and those that are attached to a bicycle frame extension 2 (see Figure 3), which is an extension of the frame body 20, as described below. In the following description, to distinguish between the two, the former will sometimes be referred to as seat post 12a and the latter as seat post 12b.

[0021] The frame body 20 is made of metal and includes a vertical pipe 21, a head pipe 22, an upper pipe 23, a lower pipe 24, a back fork 25, a chain stay 26, and a tightening mechanism 27.

[0022] The stand pipe 21 is cylindrical and supports the saddle 10 by inserting and fixing the other end of the seat post 12 therein. The head pipe 22 is cylindrical and rotatably supports a handlebar stem 32 (described later). The upper pipe 23 is a long member that connects the upper part of the stand pipe 21 to the head pipe 22. The lower pipe 24 is a long member that connects the lower part of the stand pipe 21 to the head pipe 22. The central axes of the stand pipe 21, head pipe 22, upper pipe 23, and lower pipe 24 are contained within the same imaginary plane. A cylindrical bearing unit (not shown) is connected to the lower end of the stand pipe 21. A crankshaft (not shown) is rotatably supported within this bearing unit. The central axes of the bearing unit and the crankshaft are oriented perpendicular to the imaginary plane.

[0023] The back fork 25 is a long member having one end connected to the upper part of the stand pipe 21 and extending from the upper part of the stand pipe 21 in the opposite direction to the head pipe 22. The chain stay 26 is a long member having one end connected to the lower part of the stand pipe 21 and extending from the lower part of the stand pipe 21 in the opposite direction to the head pipe 22. The other end of the back fork 25 and the other end of the chain stay 26 are connected, and the stand pipe 21, the back fork 25, and the chain stay 26 form a triangle.

[0024] Two back forks 25 and two chain stays 26 extend from the standpipe 21, and the other ends of the pair of back forks 25 and chain stays 26 face each other with a distance slightly greater than the width of the rear wheel 41. The pair of back forks 25 and chain stays 26 are also line-symmetrical with respect to the aforementioned imaginary plane.

[0025] The back fork 25 also has a fixing portion 25a near the other end for fixing the other end of the support shaft 61 of the bicycle frame extension 2, which will be described later. The fixing portion 25a extends in the form of a flat plate from the other end of the back fork 25, and a bolt hole is formed in the flat surface of this extending portion.

[0026] The tightening mechanism 27 is provided at the upper end of the standpipe 21 and fixes the seat post 12 to the standpipe 21 by reducing the diameter of the standpipe 21.

[0027] The tightening mechanism 27 cannot tighten a seat post 12 having an outer diameter smaller than a specified outer diameter. According to this embodiment, the seat post 12a and the seat post 12b do not have the same diameter, but the diameter of the seat post 12b is set smaller. Therefore, the tightening mechanism 27 can tighten the seat post 12a, but cannot tighten the seat post 12b.

[0028] According to this embodiment, a plurality of (e.g., three) slits extending downward are formed in a portion of the upper end of the standpipe 21, dividing the upper end of the standpipe 21 into a plurality of curved extension pieces. A U-shaped plate-like member is disposed at the upper end of the standpipe 21 and fixed to one of the extension pieces by welding. Bolt holes are formed in the flat surfaces at both ends of the plate-like member, and a nut is fixed to the edge of one of the bolt holes. A bolt is passed through the other bolt hole and threaded into the nut, thereby forming the tightening mechanism 27. Loosening the bolt allows the seat post 12a to slide relative to the standpipe 21, allowing the saddle 10 to be adjusted to a desired height. Tightening the bolt reduces the diameter of the upper portion of the standpipe 21, thereby tightly fixing the seat post 12a to the standpipe 21.

[0029] The handlebar 30 is a handlebar body operated by the user while riding. The front fork 31 includes a cylindrical fork column 31a inserted into the head pipe 22 and a long, U-shaped fork portion 31b. One end of the fork column 31a is connected to the center of the fork portion 31b, and the other end extends in the opposite direction to the extension direction of the fork portion 31b. The handle stem 32 is a member that connects the handlebar 30 and the front fork 31.

[0030] When inserted into the head pipe 22, the fork column 31a is rotatable around the axis of the head pipe 22 inside the head pipe 22, and the upper part of the fork column 31a protrudes from the head pipe 22. A handle stem 32 is fixed to this protruding part, and the handlebars 30 are attached to the handle stem 32.

[0031] The front wheel 40 is made up of an annular rim 40a, a hub 40b at the center of the rim, spokes (not shown) connecting the rim 40a and the hub 40b, and a tire 40c arranged on the outer periphery of the rim 40a. The rear wheel 41 has a similar configuration to the front wheel 40, so a detailed description will be omitted.

[0032] The front wheel 40 is disposed inside the fork portion 31b of the front fork 31, and the hub 40b is fixed to the tip of the fork portion 31b, thereby attaching the front wheel 40 to the front fork 31. As a result, when the user operates the handlebar 30, the fork column 31a rotates in conjunction with the handlebar 30, and the fork portion 31b also rotates, making it possible to change the direction of the front wheel 40.

[0033] The rear wheel 41 is positioned between a pair of back forks 25 and chain stays 26, and is attached to the frame body 20 by fixing the hub (not shown) of the rear wheel 41 to the other end of the pair of back forks 25 and chain stays 26.

[0034] The gear crank 50 includes a gear-shaped sprocket around which the chain 54 is wound, and a rod-shaped crank fixed to the sprocket and extending radially from the center of the sprocket. The gear crank 50 is attached to the frame body 20 by fixing the center of the sprocket to one end of a crankshaft rotatably attached to the lower end of the stand pipe 21. The crank 51 is a rod-shaped member having the same length as the crank of the gear crank 50 and fixed to the other end of the crankshaft. The crank of the gear crank 50 and the crank 51 face in opposite directions by 180 degrees. The pedal 52 is a rectangular parallelepiped member rotatably attached to the other end of the crank of the gear crank 50 and the crank 51. The direction of the rotation axis of the pedal 52 is perpendicular to the longitudinal direction of the crank 51. In other words, the rotation axis of the pedal 52 and the central axis of the crankshaft attached to the lower end of the stand pipe 21 are parallel to each other.

[0035] The freewheel 53 is a member that transmits rotation to the rear wheel 41. The chain 54 is an annular member that is wound around the outer periphery of the sprocket of the gear crank 50 and the freewheel 53, and transmits the rotation of the gear crank 50 to the freewheel 53.

[0036] When the user depresses the pedals 52 to rotate the crankshaft at the lower end of the standpipe 21, the gear crank 50 rotates, and the rotation is transmitted to the freewheel 53 via the chain 54, causing the rear wheel 41 to rotate. When the user stops rotating the pedals 52, the rear wheel 41 rotates by inertia due to the function of the freewheel 53.

[0037] <Configuration of bicycle frame extension 2> FIG. 2 is a perspective view showing the appearance of the bicycle frame extension 2 of the bicycle 1 according to one embodiment of the present invention.

[0038] The bicycle frame extension 2 includes an extension standpipe 60, two support shafts 61, 61, and a tightening mechanism 62.

[0039] The extension standpipe 60 is configured in a cylindrical shape with the same outer diameter as the seat post 12a, and can be inserted into the standpipe 21. In other words, the inner diameter of the extension standpipe 60 is smaller than the inner diameter of the standpipe 21. The extension standpipe 60 is formed with an indicator 60a that indicates the length to be inserted into the standpipe 21.

[0040] One end of each of the two support shafts 61 is welded to the top of the extension standpipe 60 and extends diagonally downward. The other end of each of the support shafts 61 is formed into a flat plate by pressing, and bolt holes are formed in the flat plate surface. The length of the support shafts 61 and the direction of extension of the support shafts 61 relative to the extension standpipe 60 are set so that when the extension standpipe 60 is inserted into the standpipe 21 up to the position of the indicator 60a, the other end of each of the support shafts 61 faces the fixing portion 25a formed on the backhawk 25.

[0041] The tightening mechanism 62 is provided at the upper end of the extension standpipe 60 and tightens the diameter of the extension standpipe 60 to secure the seat post 12b to the extension standpipe 60. The tightening mechanism 62 has a configuration substantially similar to that of the tightening mechanism 27 provided at the top of the standpipe 21, and includes a U-shaped curved plate-like member 62a, bolts 62b passed through both ends of the plate-like member 62a, and nuts 62c threaded onto the bolts 62b. However, because the outer diameter of the extension standpipe 60 is smaller than the outer diameter of the standpipe 21, the curvature of the U-shape of the plate-like member 62a is smaller than the curvature of the U-shape of the plate-like member of the standpipe 21. A slit 60b extending downward from the upper end is formed in the upper part of the extension standpipe 60, and the plate-like member 62a is placed on the upper part of the extension standpipe 60 and fixed by welding so that both ends of the plate-like member 62a are positioned on either side of the slit 60b. Then, by loosening the bolt 62b, it becomes possible to slide the seat post 12b relative to the extension stand pipe 60, and the saddle 10 can be adjusted to the desired height. By tightening the bolt 62b, the diameter of the upper part of the extension stand pipe 60 is reduced, and the seat post 12b is tightly fixed to the extension stand pipe 60.

[0042] FIG. 3 is a side view showing a state in which a bicycle frame extension 2 and a saddle 10 are attached to a bicycle 1 according to an embodiment of the present invention.

[0043] When attaching the bicycle frame extension 2 to the bicycle 1, the extension standpipe 60 is inserted into the standpipe 21, the indicator 60a is aligned with the standpipe 21, and the other ends of the support shafts 61, 61 are positioned opposite the fixing portion 25a of the backhawk 25. In this state, the extension standpipe 60 is fixed to the standpipe 21 by rotating the bolt of the tightening mechanism 27. Furthermore, the other ends of the support shafts 61, 61 are connected to the backhawk 25 by passing a bolt through the bolt hole in the other end of the support shafts 61, 61 and the bolt hole in the fixing portion 25a and tightening the nut. This forms a triangular structure consisting of the support shaft 61, the backhawk 25, and the standpipe 21 with the extension standpipe 60 inserted, and the bicycle frame extension 2 is fixed to the frame body 20.

[0044] Finally, the seat post 12b is inserted into the extension standpipe 60 and the bolt 62b of the tightening mechanism 62 is rotated to fix the seat post 12b to the extension standpipe 60, thereby making the bicycle 1 ready for use.

[0045] According to this embodiment, the inner diameter of the extension standpipe 60 is smaller than the inner diameter of the standpipe 21. Therefore, when using the bicycle frame extension 2, it is desirable to attach a seatpost 12b, the outer diameter of which is slightly smaller than the seatpost 12a of the saddle 10 shown in FIG. 2, to the saddle 10, or to prepare a dedicated saddle 10 having a seatpost 12b that can be inserted into the extension standpipe 60. Note that, because the seatpost 12b can be inserted into the extension standpipe 60 and partially inserted into the standpipe 21, the seatpost 12b can be made longer than the seatpost 12a. As a result, the range of height adjustment for the saddle 10 can be widened.

[0046] If the user is short, the bicycle is used without attaching the bicycle frame extension 2, as shown in Figure 1. If the user is tall, the bicycle frame extension 2 is attached and the handlebars 30 are rotated forward 180 degrees to position the grip portion of the handlebars 30 in front of the head pipe 22, as shown in Figure 3. This makes it possible to make large adjustments to the height of the saddle 10 and the grip position of the handlebars 30 as the user grows.

[0047] According to this embodiment, the bicycle configuration can be changed depending on the user's height, allowing the user to use the bicycle in a configuration that is optimal for the user. For example, a child in the early grades of elementary school can use the bicycle in the configuration shown in FIG. 1 , and when the child reaches the upper grades of elementary school and grows taller, the bicycle can be used in the configuration shown in FIG. 3 . This allows the bicycle to be used for a long period of time. Furthermore, by inserting the extension standpipe 60 into the standpipe 21, the length of the standpipe 21 can be extended, allowing the saddle 10 to be adjusted to a higher position. If the support shafts 61, 61 were not present, the extension standpipe 60 would be inclined obliquely toward the rear wheel along the standpipe 21, and a large load would be applied to the connection portion of the extension standpipe 60 with the standpipe 21 when the user sat on the saddle 10. According to this embodiment, the extension standpipe 60 is supported from the rear by the support shafts 61, 61. This distributes the load applied to the extension standpipe 60 when the user sat on the saddle 10, preventing the extension standpipe 60 from deforming while the bicycle 1 is in use.

[0048] <Modifications of the Bicycle Frame Extension 2> Fig. 4 is an explanatory diagram showing the configuration of a modified bicycle frame extension 2 for bicycle 1 according to one embodiment of the present invention, with Fig. 4(a) being a plan view seen from above along the central axis of the extension standpipe 60, and Fig. 4(b) being a side view. Fig. 5 is a side view showing the modified bicycle frame extension 2 attached to the frame body 20. Note that components that are the same as or have the same functions as those in the bicycle frame extension 2 shown in Fig. 2 are given the same reference numerals, and detailed descriptions thereof will be omitted.

[0049] In the bicycle frame extension 2 shown in FIG. 2, the support shafts 61 are welded and fixed to the extension standpipe 60. In contrast, in the modified bicycle frame extension 2 shown in FIG. 4, the support shafts 61 are rotatably connected to the extension standpipe 60. Specifically, one end of the support shafts 61 is also formed into a flat plate by crushing, and a bolt hole is formed in this flat plate. Then, a bolt of the tightening mechanism 62 is inserted into this bolt hole, and one end of the support shafts 61 is positioned between the flat plate portion at the top of the extension standpipe 60 and the nut 62c, and between the flat plate portion at the top of the extension standpipe 60 and the head of the bolt 62b. In this way, the support shafts 61 are rotatably supported by the tightening mechanism 62.

[0050] In addition, in the bicycle 1 shown in Fig. 2, the other end of the back fork 25 is connected to the other end of the chain stay 26. In contrast, in the bicycle 1 shown in Fig. 4, the other end of the back fork 25 and the other end of the chain stay 26 are connected to the rear claw 28 that supports the rear wheel 41, as shown in Fig. 5. Furthermore, the other ends of the support shafts 61, 61 are connected to the rear claw 28 by bolting or the like.

[0051] In this way, the support shafts 61, 61 are rotatable relative to the extension standpipe 60, which allows the other ends of the support shafts 61, 61 to move. Furthermore, the support shafts 61, 61 are rotatable relative to the extension standpipe 60, and further, the rear jaws 28 are formed with a plurality of holes aligned in the front-to-rear direction for bolting the other end of the extension standpipe 60. This allows the other end of the extension standpipe 60 to be fixed to the rear jaws 28 when the length of the extension standpipe 60 extending from the standpipe 21 is changed. This makes it easy to position the other ends of the support shafts 61, 61 at the connecting portions of the rear jaws 28, thereby reducing the workload required to install the bicycle frame extension 2.

[0052] Although the embodiments of the present invention have been described above, the embodiments of the present invention are not limited to the above-described embodiments. For example, in the above-described embodiments, the other ends of the support shafts 61, 61 are directly connected to the frame body 20. However, this is not limiting, and optional fittings may be attached to the frame body 20 near the support parts for the rear wheels, and the other ends of the support shafts 61, 61 may be connected to the frame body 20 via these fittings.

[0053] In addition, in the above-described embodiment, bolts and nuts are used to connect the frame body 20 to the other end of the support shafts 61, 61, but the fixing method is not important as long as the frame body 20 and the support shafts 61, 61 can be firmly connected.

[0054] Furthermore, in the above-described embodiment, the bicycle frame extension 2 is attached to the frame of a bicycle for lower elementary school children as the bicycle 1, but a bicycle frame extension 2 for adults may also be attached. Furthermore, if a user who has used bicycle 1 with bicycle frame extension 2 attached thereto feels that the bicycle saddle is too high as they get older, they may remove bicycle frame extension 2 and lower the saddle. In this way, bicycle frame extension 2 may be attached in advance to a bicycle for seniors.

[0055] Furthermore, in the above-described embodiment, the other ends of the support shafts 61, 61 are connected to the frame body 20 near the rear wheel 41, but it is also possible to add a support shaft 61 that connects the upper part of the extension stand pipe 60 to the upper pipe 23, thereby forming a triangular structure consisting of the stand pipe 21 with the extension stand pipe 60 inserted therein, the support shaft 61, and the upper pipe 23. This more reliably prevents the extension stand pipe 60 from being deformed due to a load applied to the extension stand pipe 60 by the weight of the user when using the bicycle 1.

[0056] It should be noted that within the scope of the concept of the present invention, those skilled in the art may conceive of various modifications and alterations. Therefore, it is understood that such modifications and alterations fall within the scope of the present invention. For example, even if a person skilled in the art appropriately adds, deletes, or modifies components of the above-described embodiment, or adds, omits, or modifies the conditions of a process, such modifications are also included within the scope of the present invention as long as they maintain the gist of the present invention. [Explanation of symbols]

[0057] 1. Bicycle 2 Bicycle frame extensions 10 Saddle 12 Seat pipe 20 Frame body 21 Standpipe 22 Head pipe 23 Upper Pipe 24 Down pipe 25 Backhawk 25a Fixed part 26 Chainstay 27 Tightening mechanism 28 Back 30 Handlebars 31 Former Hawk 31a Hawk Column 31b Hawk Club 32 handlebar stem 40 front wheel 40a rim 40b hub 40c tires 41 rear wheel 50 gear crank 51 Crank 52 pedals 53 Freewheel 54 Chain 60 Extension vertical pipe 60a indicator 60b slit 61 Support shaft 62 Tightening mechanism 62a Plate-shaped member 62b Bolt 62c nut

Claims

1. a cylindrical extension standpipe into which a seat post supporting a saddle can be inserted and into which the seat post can be inserted from above; A bicycle frame extension device comprising: a support shaft whose one end is connected to the top of the extension standpipe and whose other end is connected to a predetermined portion of the frame body, and which forms a triangular structure with the standpipe into which the extension standpipe is inserted and the frame body.

2. 2. The bicycle frame extension of claim 1, Two support shafts are connected to the upper part of the extension standpipe, The other ends of the two support shafts are connected to the frame body near both sides of the rotation axis of the rear wheel.

3. 3. The bicycle frame extension of claim 2, The support shaft is rotatably connected to the extension standpipe.

4. A bicycle frame extension according to any one of claims 1 to 3; A bicycle comprising: a connecting portion that connects to the other end of the support shaft.

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