JP2003072650A - Portable simple bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable simple bicycle by simplifying frames, wheels, etc., of a portable mini-cycle to make it compact and light for compacting its form when parked, mounted on a vehicle, or carried into a vehicle, lowering a seated attitude to enable driving at low speed, and enabling it to be easily carried. SOLUTION: A hanger 1 for installing a power transmitting part comprising a crank 17, a gear crank 15, and a crank shaft 14 for installing pedals 18A and 18B is fixed to a head pipe 2. A frame 7 having a support part 12 for a rear wheel 8 is fixed to the hanger 1. Expandable vertical pipes 9A and 9B to support a seat post 10 are vertically provided above the frame 7. A front fork 3 is installed on the head pipe 2 to support a front wheel 4 at a lower part. A foldable handlebar stem 5 is provided at an upper part. A chain 16 is stretched between the gear crank 15 and a free wheel 13.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable bicycle, in which the structure of a frame, wheels, and the like is simplified, reduced in size and weight, and can be carried easily and easily. About simple bicycles. 2. Description of the Related Art Conventionally, bicycle frames have various shapes including a diamond shape. In any case, a vertical pipe is erected at an intermediate portion of the frame, and a hanger is provided below or below the vertical pipe. A front head pipe and the hanger are provided near the front pipe and the hanger are supported via a frame, and are provided at remote positions. A front fork is attached to the head pipe, and a front wheel is supported below. Behind the standing pipe, a back fork and a chain stay are formed in a triangular shape, and a rear end of the chain stay supporting a rear wheel is often used. In addition, a portable minicycle having a wheel diameter of 24 or less is used, and a saddle and a steering wheel are provided at a high position with respect to a small wheel. [0003] Bicycles are used as a light vehicle, and the type of vehicle that suits the purpose is used. The number of users is increasing today. ing. Even mini-cycles for portable use require space because they are not extremely miniaturized due to the structure of the frame, the size of the wheels, and the like.
For this reason, there is a drawback that it cannot be easily carried into a vehicle when used in conjunction with public transportation means, and the same applies to a case where the vehicle is used in a trunk of a passenger car.
In addition, portable mini-cycles are used as general bicycles for short-distance low-speed running, but bicycles that can run slowly at low speed by lowering the sitting posture of small bicycles have not been realized. In order to solve the above-mentioned problems, the present invention simplifies the frame and wheels, reduces the size and weight of the vehicle, reduces the size of the vehicle when the vehicle is parked, carried on a vehicle, and carried in a vehicle. An object of the present invention is to provide a portable simple bicycle that can be run slowly and at a low speed in a low posture and that can be easily and easily carried. [0005] In order to achieve the above object, a portable simple bicycle of the present invention has the following configuration. In the rear side of the head pipe, a hanger for rotatably mounting the crankshaft of a power transmission unit including a pair of left and right cranks provided with a pedal at the tip and a gear crank and a crankshaft is directly fixed. The mounting angle of the pipe can be normal rearward tilting or vertical, but the front section will maintain an appropriate distance between the handlebar and the saddle, and the caster angle on the front wheel will make it stable in the traveling direction Is achieved. A telescopic upright pipe for supporting a seat post having a saddle at the tip above a proper position of the frame is fixed to the hanger at the tip end of a frame having a rear wheel support at the rear end. Stand and fix. The standing position of the standing pipe is such that when sitting on the saddle, the pedal can be depressed in a low position with the knees bent at a right angle while sitting on a chair, and the load applied to the front and rear wheels is controlled. In consideration of the above, the vertical pipe is erected vertically at a position where a load similar to that of a general bicycle is applied. When the head pipe is tilted rearward, an appropriate distance between the handlebar and the saddle is maintained when the vertical pipe is also tilted rearward. [0007] A front wheel is rotatably mounted on the head pipe, a front wheel is supported below, and a handle stem which is foldable upward is provided. A freewheel provided on the rear hub shaft end side of the gear crank and the rear wheel is provided. A power transmission unit may be of a drive shaft type instead of a chain type. Embodiments of the present invention will be described based on embodiments with reference to the drawings. In FIG. 1, the head pipe (2) is tilted forward, and the hanger (1) is fixed to the rear side.
On the rear side of the hanger (1), a frame (7) having a support portion (12) for a rear wheel (8) is fixed at the rear end. Above the frame (7), an extensible vertical pipe (9) supporting a seat post (10) provided with a saddle (11) at the tip is provided.
A) Although (9B) is vertically installed and fixed, the upright pipe (9A) can be vertically expanded and contracted by upright pipe adjustment bolts (22B). The head pipe (2) has a front fork (3)
The front wheel (4) is supported below via a front hub shaft (24), and the rear wheel (8) is mounted on the support (12) at the rear end of the frame (7). Hub axle (25)
Is supported through. The front wheel (4) and the rear wheel (8) preferably have an outer diameter of about 150 mm, and may be rubber wheels. It should be noted that a pneumatic tire can also be used by using a crank (17) and a gear crank (15) with a large interval between the cranks. Above the front fork (3), a handlebar (5) that can be folded and a handlebar (6) for fitting the right hand (19A) and the left hand (19B) as shown in FIG. The handle stem (5), which can be moved up and down by a handle adjusting bolt (21) and can be folded, may have a known mechanism. The hanger (1) is rotatably mounted with a crankshaft (14) of a power transmission unit.
At 4), the crank (17) with the pedals (18A) and (18B) attached to the tip is fitted to the left and the gear crank (15) is fitted to the right. The number of gears of the gear crank (15) may be about 34, the length of the left and right cranks (17) and (15) may be about 130 mm, and the running speed is adjusted by appropriately increasing or decreasing the number of gears. You can also. A chain (16) is provided between the gear of the gear crank (15) and the freewheel (13) attached to the rear hub shaft (25) end of the rear wheel (8) as shown in FIG. It is hung. The freewheel (13)
The number of gears is preferably about 11 gears. A normal brake can be attached to the side opposite to the freewheel (13). FIG. 4 shows the folded state of the present invention. To fold the handle, the state where the handle stems (5) are connected and connected is released by the handle adjusting bolts (21), and the handle stem is contracted downward. The state in which the bent portion of the stem (5) is connected is released by the handle stem lock pin (20), and the handle (5) is folded backward by folding. Next, a vertical pipe (9A) provided above the frame (7)
(9B) is unfolded by the vertical pipe adjustment bolt (22B), and the seat post (10) is uncoupled by the saddle adjustment bolt (22A). I will. FIG. 5 shows a storage bag (23) that can store the folded state. The present invention has the above-described structure, and when the rider travels for use, the saddle adjustment bolt (1) is set so that when the rider first sits on the saddle (11), he or she sits on a chair. 22A) and the seat post (10)
The handlebar (6) is adjusted to the appropriate height by the handle adjustment bolt (21), and then the left (19B) and right (19A) are gripped with both hands, and the saddle (11) is adjusted. When the driver sits on the right pedal (18A) and the left pedal (18B) with both feet and rotates in the traveling direction, power is transmitted from the gear crank (15) of the crankshaft (14) via the chain (16) to the freewheel (13). ) To drive the rear wheel (8), lower the center of gravity, and run at low speed with a stable riding posture. Since the present invention is configured as described above, it has the following effects. Since the frame and wheels are simplified and reduced in size and weight, they can be carried easily and easily, can be easily carried in a vehicle, and require less space for vehicle mounting and bicycle parking. By tilting the head pipe forward, the vehicle can run while maintaining the same handle position as that of a general bicycle, and the front wheels can have caster angles. By setting the position of the handle and the height of the saddle low, the vehicle can run in a stable posture with a low center of gravity. Since the gear ratio between the gear of the gear crank and the freewheel is made small and the wheels are made small, it is possible to run at low speed and safely. In the case of a frame having an upwardly open shape in which the head pipe is tilted forward and the standing pipe is tilted rearward, the height of the handlebar and the saddle are adjusted up and down to adjust the height.
A wide range of people, from adults to children, can ride a single bicycle.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall right side view showing an embodiment of the present invention. FIG. 2 is an overall front view showing an embodiment of the present invention. FIG. 3 is an overall plan view showing an embodiment of the present invention. FIG. 4 is an overall right side view showing a folded embodiment of the present invention. FIG. 5 is an overall right side view of a storage bag showing an embodiment in a stored state of the present invention. Front fork 4 Front wheel 5 Handle stem 6 Handle bar 7 Frame 8 Rear wheel 9A Standing pipe 9B Standing pipe 10 Seatpost 11 Saddle 12 Supporting part 13 Freewheel 14 Crankshaft 15 Gear crank 16 Chain 17 Crank 18A Right pedal 18B Left pedal 19A Right grip 19B Left grip 20 Handle stem lock pin 21 Handle adjustment bolt 22A Saddle adjustment bolt 22B Vertical pipe adjustment bolt 23 Bag 24 before after the hub shaft 25 hub axis

Claims (1)

Claims: 1. A pedal (18) is attached to a head pipe (2).
A) A pair of left and right cranks (1
7) and a hanger (1) for rotatably mounting the crankshaft (14) of a power transmission unit composed of a gear crank (15) and a crankshaft (14), and fixing the hanger (1).
, A front end of a frame (7) having a support portion (12) for a rear wheel (8) at the rear end is fixed, and a seat post (10) is supported above an appropriate position of the frame (7). An extendable upright pipe (9A) (9B) is erected, and a front fork (3) is rotatably attached to the head pipe (2) to support a front wheel (4) at a lower position and upward. A foldable handle stem (5) is provided, and a chain (16) is hung between the gear crank (15) and a freewheel (13) provided on the rear hub shaft (25) end side of the rear wheel (8). Portable simple bicycle consisting of.