JP2011068326A - Bicycle reciprocating type pedal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of being much in uselessness since the movement of a foot is restricted by the movement of a foot being slow in a driving speed, due to performing driving only by one foot since right and left feet for driving a bicycle can be used only alternately in a conventional structure. <P>SOLUTION: By this reciprocating type pedal device characterized by having right and left pedal cranks for making rotary reciprocating motion, a one-way clutch pivoted on the rotational center of the right and left pedal cranks and transmitting force when a pedal advances, a rope for connecting a sprocket wheel, a driving chain and the right and left pedal cranks fixed to its transmission shaft, a pulley for guiding the rope and a device for installing its pulley on one end and, having the other end installed in a frame and capable of making reciprocating motion like a tension spring. simultaneously usable time of both feet is increased, and the feet can be returned in a short time. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a technique for improving the efficiency of driving a bicycle.

  Conventional bicycles are driven by using the left and right feet alternately.

Patent Publication 2004-10033

  Since the left and right feet for driving the bicycle can only be used alternately in the conventional structure, the driving was performed only with one foot. Also, the movement of the foot was restrained by the movement of the slow driving speed, and was wasteful.

  The left and right pedal cranks that rotate and reciprocate, the one-way clutch that is pivotally attached to the center of rotation of the left and right pedal cranks, and the sprocket wheel and drive chain fixed to the transmission shaft A reciprocating pedal having a rope for connecting a pedal crank, a pulley for guiding the rope, and a pulley having the pulley attached to one end, and having a device capable of reciprocating like a tension spring attached to the frame at the other end The device increases the time when both feet can be used at the same time and allows the feet to be returned in a short time.

  When starting a bicycle, only one pedal can be used because one foot is on the ground, but after starting running, both feet can be used to increase the driving force.

  In the conventional technology, the movement of the foot was restricted by the speed of the forward rotation of the pedal crank in the process of returning the pedal, so it was impossible to increase the speed, but it is possible to return the pedal and both feet in a short time Thus, the time when the foot is not used for the bicycle propulsion is shortened.

Part of a bicycle reciprocating pedal drive seen from the side FIG. 1 is a plan view (in order to illustrate the one-way clutch 18 and the transmission shaft 19, a part of the diagram of the rope 4 of the part is omitted).

  FIG. 1 is a side view of a drive unit of a bicycle. The right pedal 1 and the left pedal 2 are rotatably attached to the tip of the pedal crank 3, and the two left and right pedal cranks 3 are connected by a rope 4 from the rear.

  The rope 4 is hung on a pulley 7 located at the center in the left-right direction of a frame 11 of a hollow pipe having a rectangular cross section.

  The top and bottom surfaces of the pulley 7 are guided by square windows 17 opened on the left and right side surfaces of the frame 11. The shaft 8 of the pulley 7 is attached to one end of a tension spring 10 via a bracket 9. The other end of the spring 10 is fixed to the frame 11.

  The large end portions 5 of the left and right pedal cranks 3 that reciprocate as indicated by arrows 16 transmit force to the chain sprocket 6 fixed to the transmission shaft via the one-way clutch 18 and the transmission shaft 19 of FIG. The bicycle 14 is driven by the chain 14 that is hung as shown by the arrow 15 moving.

  The transmission shaft 19 is pivotally supported by a bearing 21 fixed to a bracket 20 fixed to the frame 11.

  The frame 11 is provided with a forward limit stopper 12 and a reverse limit stopper 13 for reciprocal movement on the left and right pedal cranks 3 respectively.

  In the initial state of the apparatus having the above configuration, the pulley 7 is pulled rearward by the tension spring 10, and both the left and right pedal cranks 3 are at the position of the backward limit stopper 13. As shown below, the bicycle can be propelled in response to any movement of the foot in the longitudinal direction.

  When the pedal is pushed forward only with the right foot, the rope 4 is pulled, the pulley 7 moves forward by half the amount of pedal movement, and the tension spring 10 is extended. The force of the right pedal crank is transmitted from the transmission shaft to the sprocket wheel 6 and the chain 14 via the right one-way clutch. At this time, no force is transmitted to the left one-way clutch 18 and the left pedal crank 3 does not move from the position of the reverse limit stopper 13. (The explanation of force transmission will be omitted later.)

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When the bicycle starts and both feet can be used, if both feet advance simultaneously, both ends of the rope 4 attached to the pedal crank 3 are pulled, the pulley 7 moves greatly, and the tension spring 10 extends greatly. At this time, since the force of both feet is used, the driving force is increased. In addition, both legs can be quickly returned using the force of the spring.

  When both feet are used alternately with this apparatus as in a conventional bicycle, the position of the pulley 7 does not change, and the bicycle repeats normal rotation and reverse rotation, and the bicycle runs.

  This device reciprocates the area where the most force is applied to the foot, reducing the range of the path where the conventional rotary pedal device is difficult to enter, and using both feet when needed In addition, the speed of reverse movement can be increased and the efficiency of foot movement can be increased. Moreover, it can be used by people who are aging and whose foot movement is restricted.

  When mounted on an electrically assisted bicycle, a motor with twice the motor power can be used, so that the bicycle can be input with both feet.

  Since it can respond to any movement of both feet, it is possible to make a device that can apply a load to the hands, arms and even the upper body by devising the arrangement, making it a health device for rehabilitation and metapo measures Can do.

1 right pedal 2 left pedal 3 pedal crank arm 4 rope 5 large end 6 chain sprocket 7 pulley 8 shaft 9 bracket 10 tension spring 11 frame 12 forward limit stopper 13 reverse limit stopper 14 chain 15 arrow 16 arrow 17 square window 18 One-way clutch 19 Transmission shaft 20 Bracket 21 Bearing

Claims (1)

  The left and right pedal cranks that rotate and reciprocate, the one-way clutch that is pivotally attached to the center of rotation of the left and right pedal cranks, and the sprocket wheel and drive chain fixed to the transmission shaft A reciprocating pedal having a rope for connecting a pedal crank, a pulley for guiding the rope, and a pulley having the pulley attached to one end, and having a device capable of reciprocating like a tension spring attached to the frame at the other end apparatus.

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