JP5163942B2 - Portable bicycle - Google Patents

Description

  The present invention relates to an improvement in the front wheel drive system of a bicycle and the accompanying reduction in weight at the time of folding.

  Many folding bicycles have been put on the market in the past, but there are not many products that can be easily brought into general transportation. The reason is that the folding process and the weight volume after folding, the parked bicycles and parking bicycles in the station etc. In order to prevent theft of a bicycle, a portable bicycle is desired.

  Most of the current folding bicycles have a method of folding a rear-wheel drive bicycle, which includes highly complete parts such as a large-diameter rear wheel for achieving the required speed, and a large size for stabilizing the running performance. It is difficult and complicated to fold a rear wheel drive bicycle with a fixed shape, such as a front wheel of a diameter, a reinforced frame for supporting a drive pedal in the middle of the front wheel and the rear wheel, a chain drive device, etc. Even if it is folded and reduced in a complicated process, the weight is not reduced and the weight reduction of the rear wheel drive bicycle is limited.

  Considering the front wheel drive of the bicycle here, it approaches the reduction in weight, the large-diameter rear wheel to give the required speed of the previous example can also be used as the front wheel, the frame is only the role of the rear wheel connection and the rear wheel is also small and simple And the drive unit can be concentrated near the front wheels.

  There are almost no products on the market for front-wheel drive bicycles, but there are several patents or application examples. For example, there is a method in which a pedal is directly attached to the front fork to transmit the driving force, Japanese Patent Laid-Open No. 09-272485, but this Depending on the angle of travel, there are cases where both feet cannot be placed on the pedal and cannot be driven. To solve this problem, there is a universal joint drive transmission system, for example, Japanese Patent Application Laid-Open No. 09-104385, but this system has rear wheel drive. It needs more than a car and is not considered a folding bike.

  Problems to solve the above problems are that the pedal position is not affected by the steering wheel operation, and that the folding process is simplified and the weight is reduced so that it can be brought into general transportation.

  As the front wheel drive system of the above problem, the handle stay rotation center line at the time of handle operation is used as a drive force passage, and the handle stay rotation part includes the handle stay rotation center line from the handle side so that the drive force passes through the passage. By creating a drive force transmission space that passes through the handle stay rotating part and escapes to the front fork stay, the drive force is transmitted using this space, and the force that pulls the rope through the drive stay rotation center line Transmit drive.

  This driving rope transmits the driving force without being affected by the twisting of the steering wheel rotation, and the belt wheel size is fixed parallel to the front wheel tire axis, and the rope wheel can be connected with the freewheel to rotate to the front fork above the front wheel tire. And the rope entrainment portion of the rope wheel rotates an intermediate shaft attached at a position coinciding with the handle stay rotation center line, and the rotational force of the intermediate shaft is a belt wheel small fixed to the front wheel shaft hub. The driving force transmitted to the front wheels by the belt connecting the previous belt belt size is fixed at the end of the rope for transmission and wrapped once or more, and the driving force passes through the center line of the previous steering wheel stay. From the upper part of the transmission space, bend downward with a fixed pulley, fix the end to the moving pulley, distribute it into two with the moving pulley, and pair the pedals with the fulcrum on the handle support part in the previous period The rope car is transmitted to the intermediate shaft by pressing the pedal and the rope is energized, and the spring is urged in the direction to wind the driving rope and repeats winding and rewinding. This driving force repeats stepping on each foot like a walking movement. Caused by.

The third aspect of the present invention is a transmission method in which the driving force is adapted to the movement of the foot, and the driving force generated by the pair of pedals attached to the handle stay rotation support portion passes through the driving force transmission space by two rows of fixed pulleys. Two rows of rope cars connected with freewheels are individually rotated and transmitted from the intermediate shaft to the front wheels through the belt car large, belt, and belt car small.

A fourth aspect of the present invention is an arcuate shape for performing folding reduction, and has a rear wheel fork and a rear wheel at an end portion, and the other end is attached to the handle stay rotation support portion so as to be rotatable in parallel with the arcuate surface. Saddle slidably attached to the center, the rear wheel fork is joined so that it can only rotate inside, and the shape is held by a frame support rope stretched from the rear wheel fork to the handle stay rotation support part The frame rotates in the folding state and wraps around the front wheel, so that the front-wheel drive folding bicycle can be reduced in weight and can be portable.

  According to the present invention, an independent operability of the handle and the pedal, a lightweight and foldable front wheel drive bicycle can be provided, and the drive transmission means is a belt and a rope, and the weight is slightly reduced by not using metal. Lubricant required for metal chain is unnecessary, and there is no dirt due to lubricant when folded or carried, and because it is highly portable, it can be used together with general transportation as a means of transportation and is effective in solving neglect and theft Is.

  An embodiment of the present invention will be described with reference to FIGS.

  Reference numeral 1 denotes a frame, which is pin-coupled to the upper portion of the handle stay rotation support portion 10, and the rope 4 is fixed between the lower portion of the double row handle stay rotation support portion 10 and the rear fork. The saddle 3, which is a joint where the rear fork 7 bends only inward, is movable back and forth, and adjusts the distance between the pedal 25 and the saddle.

  The handle stay rotation center line 30 includes a space 15 for transmitting a driving force in a cylindrical cavity, and the handle 12 and the front fork 13 are attached so that the handle stay rotation center line 30 passes through a virtual line that does not move with respect to the handle rotation. When the handle is turned, the front fork moves and the front wheel 20 faces in the traveling direction, and the outside is attached to the handle stay rotation support portion 10 through a bearing.

  The drive system by the rope wheel of claim 2 is shown in FIG. 3, and if the pitch circle of the rope wheel 23 and the fixed pulley 26 is matched with the handle rotation center line 30, the drive rope 14 can be pulled up and returned when the handle is rotated. The rope can only be twisted and cannot be removed from the rope or fixed pulley.

  The drive rope 14 is fixed to the rope wheel at one end, is wound about once or more times, is bent by a fixed pulley along the handle stay rotation center line 30, and is divided into two by a moving pulley 28, and the ends are fixed to the pedals 25 respectively.

  The pedal 25 is reciprocally moved up and down with one foot so that the end of the pedal 25 is pin-coupled to the handle stay rotation support portion 10 and connected with an arm, and a stopper is attached so that the foot can be stopped at the bottom.

  Further, as described in claim 3, the method of driving the rope wheels in two rows and individually driving with both feet is shown in FIG. 4, and the pitch circle of the rope wheels and the handle stay rotation center line 30 are separated, so that the grooves of the rope wheels are deepened. To do.

  Since the rope wheel 23 having a free wheel connected to the intermediate shaft continuously entrains the rope by a torsion spring attached to the front fork, the intermediate shaft 27 is rotated by the reciprocation of the pedal to drive the belt wheel size, and the drive Is transmitted to the belt and is transmitted to the small belt wheel 21 to drive the front wheel 20.

  The ratio of the diameter of the belt car large and the belt car small adjusts the rotation of the front wheel by a single depression of the pedal.

  The ropes are made of chemical fiber, and the ropes and belts are made of plastic, making them lighter. Use belts with belts and toothed belts to prevent slipping.

  Folding frame 1 and handle stay rotation support 10 is folded so that the frame wraps around the outer periphery of the front wheel, and when the joint 5 is further folded inward, the front wheel can be covered and dirt on the tire is attached to other things. It is difficult, and it is even better to attach the tire cover 6 to the inside and rear wheels of the frame.

  In the case of a long-distance carrying, the handle is closed and the pedal is folded inward and bent inward, so that this shape can be carried for traveling using general transportation.

BRIEF DESCRIPTION OF THE DRAWINGS In the side view of the portable bicycle which shows embodiment of this invention, a partial cross section is A view and an imaginary line is the shape at the time of folding Plan view Driving method diagram of claim 2 Driving method diagram of claim 3

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame 2 Rear wheel 3 Saddle 4 Frame support rope 5 Joint part 6 Tire cover 7 Rear fork 10 Handle stay rotation support part 11 Handle stay rotation part 12 Handle 13 Front fork 14 Drive rope 15 Driving force transmission space 20 Front wheel 21 Belt car small 22 Belt car large 23 Rope car 24 Belt 25 Pedal 26 Fixed pulley 27 Intermediate shaft 28 Moving pulley 30 Handle stay rotation center line

Claims (4)

The handle stay rotating part of the bicycle handle stay, the handle stay rotating support part, the front fork stay, the front fork and the front wheel include the handle stay rotating center line of the handle stay rotating part and includes the handle stay rotating part from the handle side. A driving force transmission space penetrating through the front fork stay, a pedal for generating a reciprocating motion as a driving force provided on the handle stay rotating support side, and the reciprocating motion of the driving force transmitting space Power transmission means for transmitting until passing through the handle stay rotation center line and passing through the front fork stay, a mechanism for converting reciprocating motion provided in the front fork into rotational motion, and transmitting the rotational motion to the front wheels And a portable bicycle having front-wheel drive characteristics. Parallel to the front wheel tire axis, the belt wheel size is fixed, the rope wheel is connected with the free wheel, the front wheel tire can be rotated to the front fork, and the rope winding part of the rope wheel coincides with the handle stay rotation center line An intermediate shaft attached at a position where the rope wheel is entrained, a spring urged in the winding direction of the rope wheel, a belt connecting the small belt wheel fixed to the front wheel shaft hub and the previous belt wheel size, and the first rope vehicle Fix the end and wind it at least once, pass through the center line of the previous stay stay rotation, exit from the upper part of the previous drive force transmission space, bend downward with a fixed pulley, and fix the end to the moving pulley shaft and fix it with the moving pulley. 2. The portable bicycle according to claim 1, further comprising: a driving rope that is distributed to a book and fixed to a pair of pedals each having a fulcrum at a handle stay support portion in the previous period. 2. The rope wheel, the free wheel, the spring, the driving rope, and the fixed pulley are provided in two rows around the handle stay rotation center line. The portable bicycle according to Item 2. It is arcuate and has a rear wheel fork and a rear wheel at the end, and the other end is attached to the handle stay rotation support part so as to be able to rotate parallel to the arcuate surface, and a saddle is attached to the substantially central part so that it can slide. The rear wheel hawk is joined so as to be rotatable only on the inner side, and the frame is held by a rope stretched from the rear wheel hawk to the handle stay rotation support portion, and when folded, the frame attaches the front wheel. 4. The portable bicycle according to claim 1, wherein the portable bicycle is turned into a wrapping shape.

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