Patent Application
20230331034
The present invention relates to a collapsible bicycle and, more particularly, to a compact wheel for a collapsible bicycle.
Referring to
The hub 81 is connected to a fork 80 of a bicycle. For example, the fork 80 includes two prongs for holding two terminal sections of the hub 81. To this end, the length of the hub 81 must be longer than a distance between lower ends of the prongs of the fork 80.
A rear wheel is structurally the front wheel. However, the rear wheel is wider than the front wheel. The rear wheel is connected to a chain stay (not shown) of a bicycle. The chain stay includes two prongs for holding the terminal sections of the hub of the rear wheel. To this end, the length of the hub of the rear wheel must be longer than a distance between lower ends of the prongs of the chain stay.
Where the front and rear wheels are used in a collapsible bicycle, the front and rear wheels are located side by side when the bicycle is collapsed. A sum of the lengths of the hubs of the front and rear wheels is too large to effectively reduce the volume of the bicycle in the collapsed position.
The present invention is therefore intended to obviate or at least alleviate the problems encountered in the prior art.
It is the primary objective of the present invention to provide a wheel for a collapsible bicycle so that the wheel allows the bicycle to occupy a small space in a collapsed position.
To achieve the foregoing objective, the wheel includes a rim, a hub, and spokes. The rim, the hub and the spokes are made in one piece. The rim includes a ring extending along a center line and a clincher extending from an external face of the ring. The hub includes a first end, a second end, and a depth measured from the first end to the second end. The spokes extend to the center line of the ring from the first end of the hub so that a middle point of the depth lies in a plane defined by the center line.
Other objectives, advantages and features of the present invention will be apparent from the following description referring to the attached drawings.
The present invention will be described through detailed illustration of three embodiments referring to the drawings wherein:
Referring to
The rim 11 includes a clincher 20 extending from an external side of a ring 21, i.e., away from the hub 14. In specific, the clincher 20 includes two jaws (not numbered) extending from an external side of the ring 21. The distance between external faces of the jaws of the clincher 20 is referred to as the “width W” of the rim 11. A center line 15 extends in and along the ring 21 of the rim 11.
The hub 14 includes a channel 28 and two cavities 29. The channel 28 extends from an end or side 25 to another end or side 26. One of the cavities 29 is in communication with the channel 28 at the end 25. The other one of the cavities 29 is in communication with the channel 28 at the end 26. Preferably, the diameter of the cavities 29 is larger than the diameter of the channel 28. The distance between the ends 25 and 26 is referred to as the “depth D” of the channel 28 of the hub 14.
The wheel includes a supportive portion (not numbered) extending around the end 25 of the hub 14. The supportive portion is formed between the hub 14 and each of the spokes 13. In a radial manner, the spokes 13 extend to the center line 15 of the ring 21 of the rim 11 from the supportive portion, which extends from the end 25 of the hub 14.
The ends 25 and 26 of the hub 14 are both biased from the center line 15. Hence, each of the spokes 13 extends in a curved manner. In detail, each of the spokes 13 includes a rectilinear section 22 and a curved section 23. The rectilinear section 22 extends from the ring 21 of the rim 11. Preferably, the rectilinear section 22 extends in a plane defined by the center line 15 of the ring 21. The curved section 23 extends from the rectilinear section 22 to the end 25 of the hub 14. In detail, each of the spokes 13 further includes a root 24 formed between the curved section 23 and the hub 14. The thickness of the root 24 is larger than the thickness of the curved section 23. The hub 14 includes screw holes 27 arranged evenly around the end 26.
In another embodiment, the supportive portion extends from the end 26 of the hub 14, and the spokes 13 extend to the center line 15 of the ring 21 of the rim 11 from the supportive portion, which extends from the end 26 of the hub 14. The screw holes 27 are arranged evenly around the end 25.
The depth D of the hub 14 extends perpendicular to the plane defined by the center line 15 of the ring 21. A middle or center point of the thickness D of the hub 14 lies in the plane defined by the center line 15 of the ring 21 although the curved section 23 of each of the spokes 13 extends from the end 25 or 26 of the hub 14, which is biased from the plane defined by the center line 15 of the ring 21. Thus, the wheel 10 is allowed to roll smoothly on the road. The distance S of the first end 25 from the center line 15 is identical to the distance S of the end 26 from the center line 15. Hence, the distance S is half the depth D of the hub 14. Preferably, the distance S is equal to the width W of the rim 11. However, in another embodiment, the distance S can be smaller or larger than the width W of the rim 11.
Referring to
Referring to
A front brake disc 32 is attached to the hub 14 of the wheel 10 of the front wheel set 30 by inserting screws (not numbered) in the screw holes 27 made in the hub 14 of the wheel 10 of the front wheel set 30. A rear brake disc 35 is attached to the hub 14 of the wheel 10 of the rear wheel set 34 by inserting screws (not numbered) in the screw holes 27 made in the hub 14 of the wheel 10 of the rear wheel set 34.
In use, a section of a front axle 33 is inserted in the hub 14. The front axle 33 is connected to a fork of a collapsible bicycle (not shown). A section of a rear axle 36 is inserted in the hub 14 of the wheel 10 of the rear wheel set 34. The rear axle 36 is connected to a chain stay of the collapsible bicycle (not shown).
The curved sections 23 of the spokes 13 of the wheels 10 of the front and rear wheel sets 30 and 34 are located between the front and rear brake discs 32 and 35 when the collapsible bicycle is collapsed. The curved sections 23 of the spokes 13 of the wheels 10 of the front and rear wheel sets 30 and 34 that extend from the ends 25 (or 26) of the hubs 14 of the wheels 10 of the front and rear wheel sets 30 and 34 are located very close to each other.
The middle point of the depth D of the hub 14 lies in the plane defined by the center line 15 (
Referring to
Referring to
The present invention has been described through the illustration of the embodiments. Those skilled in the art can derive variations from the embodiments without departing from the scope of the present invention. Hence, the embodiments shall not limit the scope of the present invention defined in the claims.
