JP2014144694A - Bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bicycle enabling a user to rotate a rear wheel by roughly vertically moving a pedal by a user.SOLUTION: Guide cylinders 3 are fitted to both left and right sides of a car body frame 1. A circular-arc pedal shaft guide hole is formed to bulge forward on the outer surface of each guide cylinder. A junction stick guide hole is formed on the rear surface of each guide cylinder. A pedal shaft 11 having a pedal 9 fitted thereto is inserted into each pedal shaft guide hole. Junction sticks 13 are arranged on both left and right sides of the car body frame. The front end of each junction stick is inserted into each junction stick guide hole. The front end of each junction stick is fitted to each pedal shaft to be vertically rotatable. A driver 19 is fitted to both left and right ends of an axle 17 of a rear wheel 15. The rear end 13b of each junction stick is fitted to each driver to be vertically rotatable. Thus, the rear wheel is rotated by moving the left and right pedals roughly vertically along the pedal shaft guide hole.

Description

  The present invention relates to a bicycle, and more particularly, to a bicycle in which a user rotates a rear wheel by moving a pedal in a substantially vertical direction with a foot.

  As a bicycle, a user rotates a chain wheel by rotating a pedal attached to the tip of a pair of left and right crank arms with his / her foot, and the chain wheel and a free wheel of a rear wheel are connected via a chain, Conventionally, the one that transmits the rotation of the freewheel to the rear wheel is generally used.

  In addition, the user rotates the drive shaft by rotating the pedals attached to the front ends of the pair of left and right crank arms with his / her foot, and the drive shaft is rotated through the front gear unit, the transmission shaft, and the rear gear unit. Japanese Patent Application Laid-Open No. 64-44385 discloses a bicycle that is transmitted to a wheel.

Japanese Unexamined Patent Publication No. 64-44385

  In each of the above conventional bicycles, the user rotates the rear wheels by rotating the pedals attached to the tips of the left and right crank arms with his / her feet. That is, the user of the bicycle must repeatedly rotate the lower leg in the front-rear direction in order to rotate the pedal. This task is not always easy especially for elderly people with weak legs.

Accordingly, the present invention has been made to solve the above-described problems in the conventional bicycle, and to provide a bicycle in which a user rotates a rear wheel by moving a pedal in a substantially vertical direction. .

In order to solve the above problems, the present invention provides the following bicycles.

(1) A guide cylinder is attached to each of the left and right sides of the body frame, and an arcuate pedal shaft guide hole bulging forward is provided on the outer surface of each guide cylinder, and connected to the rear side of each guide cylinder.杆 Guide holes are provided. Pedal shafts with pedals are inserted into the pedal shaft guide holes, and connecting rods are provided on the left and right sides of the vehicle body frame. Insert the front end of the saddle, attach the front end of each connecting rod to each pedal shaft so that it can rotate in the vertical direction, attach a driver to the left and right ends of the axle of the rear wheel, and attach the rear end of each connecting rod to each It is characterized in that the rear wheel rotates by attaching the left and right pedals in the vertical direction along the pedal shaft guide hole so that the rear wheel can be rotated in the vertical direction on the driving body. Bicycle (Claim 1).

(2) The guide tube has an arc shape bulging forward.

(3) Each pedal shaft is provided with a sliding body that slides in the guide tube (claim 3).

(4) The drive body is a substantially disk-shaped body (claim 4).

(5) The left and right side portions of the vehicle body frame are each provided with guide means having an elongated hole in the vertical direction for guiding the intermediate portion of the connecting rod.

(6) A cover that covers the guide tube, the connecting rod, and the driving body is attached to the left and right side portions of the body frame.

[Invention of Claim 1]
The user can rotate the rear wheels by moving the left and right pedals in a substantially vertical direction along an arcuate pedal shaft guide hole that bulges forward. That is, when the bicycle is run, the user does not need to repeatedly rotate the lower leg in the front-rear direction, and simply moves the pedal substantially in the vertical direction. Therefore, even this elderly person with weak lower leg can ride this bicycle easily.

[Invention of Claim 2]
The guide tube itself has an arcuate shape that bulges forward, and exhibits the same effect as that of the invention of claim 1.

[Invention of claim 3]
Since each pedal shaft is provided with a sliding body that slides in the guide tube, the movement of each pedal is more stable.

[Invention of Claim 4]
Since the driving body is a substantially disk-shaped body, the driving body rotates more smoothly.

[Invention of Claim 5]
Since the left and right side portions of the vehicle body frame are each provided with guide means having an elongated hole in the vertical direction for guiding the intermediate portion of the connecting rod, the movement of the connecting rod is further stabilized. The guide means prevents the connecting rod from dropping in the unlikely event.

[Invention of Claim 6]
Since the cover which covers the said guide cylinder, the said connecting rod, and the said drive body was attached to the right-and-left both sides of the said vehicle body frame, there is no possibility that a user's clothing etc. may get entangled with these.

FIG. 1 is a plan view showing an example of a bicycle according to the present invention. FIG. 2 is a side view showing the guide tube, the pedal shaft, and the connecting rod. FIG. 3 is a plan view showing the guide tube, the pedal shaft, and the connecting rod. FIG. 4 is a cross-sectional view of the guide tube. FIG. 5 is a side view showing the guide means for the connecting rod. FIG. 6 is an explanatory diagram illustrating an example of the movement of the pedal shaft, the connecting rod, and the driving body. FIG. 7 is an explanatory diagram showing the length relationship of each part.

  What is indicated by reference numeral 1 is a bicycle body frame. Guide cylinders 3 and 3 are attached to the left and right sides of the body frame 1, respectively. In FIGS. 1, 2, 3, 6, and 7, the left side (the direction indicated by the arrow in FIG. 1) is the front of the bicycle. In the present invention, “front” refers to the front of the bicycle, and “rear” refers to the direction opposite to “front”.

  An arcuate pedal shaft guide hole 5 bulging forward is provided on the outer side surface of each guide tube 3, and a connecting rod guide hole 7 is provided on the rear side surface of each guide tube 3. The connecting rod guide hole 7 also preferably has an arc shape that bulges forward. See FIG.

  A pedal shaft 11 with a pedal 9 attached is inserted into each pedal shaft guide hole 5. Connecting rods 13 are provided on the left and right sides of the body frame 1. The front end 13a of each connecting rod 13 is inserted into each connecting rod guide hole 7, and the front end 13a of each connecting rod 13 is attached to each pedal shaft 11 so as to be rotatable in the vertical direction. A drive body 19 is attached to the left and right ends of the axle 17 of the rear wheel 15, and a rear end 13b of each connecting rod 13 is attached to each drive body 19 so as to be rotatable in the vertical direction.

  As described above, the user moves the left and right pedals 9, 9 along the pedal shaft guide holes 5, 5 in the substantially vertical direction so that the rear wheel 15 rotates.

  The left and right pedals 9 and 9, the left and right connecting rods 13 and 13, and the left and right drive bodies 19 and 19 are arranged so as to be always in symmetrical positions.

  Each guide cylinder 3 preferably has an arc shape that bulges forward, but the pedal shaft guide hole 5 provided on the outer surface of each guide cylinder 3 has an arc shape that bulges forward. Thus, the shape of the guide tube 3 itself does not necessarily have to be an arc shape that bulges forward.

  In the case where each guide tube 3 has an arc shape that bulges forward, each pedal shaft 11 is preferably provided with a sliding body 21 that slides inside the guide tube 3. That is, the sliding body 21 is fitted in the guide tube 3. See FIG.

  The driving body 19 is preferably a substantially disk-shaped body. In the example shown in FIG. 1, a support shaft 21 protrudes from each substantially disc-shaped drive body 19, and a rear end 13 b of each connecting rod 13 is attached to the support shaft 21 so as to be rotatable in the vertical direction.

  It is desirable that left and right side portions of the vehicle body frame 1 are each provided with guide means 25 having a vertical hole 23 for guiding the intermediate portion of the connecting rod 13. See FIG. 1 and FIG.

  It is desirable to attach covers 27 that cover the guide tube 3, the connecting rod 13, and the drive body 19 to the left and right sides of the body frame 1. See FIG.

  Reference numerals in FIGS. 6 and 7 will be described. What is indicated by reference numeral 31 is the center of the arc-shaped pedal shaft guide hole 5 bulging forward. What is indicated by reference numeral 13 a ′ is the rotation center of the front end 13 a of the connecting rod 13 (that is, the center of the pedal shaft 11). What is indicated by reference numeral 13 b ′ is the rotation center of the rear end 13 b of the connecting rod 13. What is indicated by reference numeral 17 ′ is the center of the axle 17 of the rear wheel 15 (that is, the rotational center of the driving body 19).

  FIG. 6 schematically shows an example of the movement of the pedal shaft 11, the connecting rod 13, and the driving body 19. When one of the left and right pedals 9 is in the uppermost position (when the pedal shaft 11 is in the uppermost position of the pedal shaft guide hole 5), the other pedal 9 is in the lowermost position (the pedal shaft 11 is It is in the lowest position of the pedal shaft guide hole 5). When the one pedal 9 is pushed down with the foot from this state, the pedal shaft 11 moves substantially downward along the pedal shaft guide hole 5 and rotates the driving body 19 in the direction of the arrow through the connecting rod 13. When the one pedal 9 reaches the lowest position, the drive body 19 rotates once and returns to the original position. At this time, the other pedal 9 reaches the uppermost position via the connecting rod 13. Subsequently, when the other pedal 9 is pushed down with the foot, the pedal shaft 11 moves substantially downward along the pedal shaft guide hole 5 and rotates the drive body 19 in the direction of the arrow through the connecting rod 13. Thereafter, in the same manner, the left and right pedals 9, 9 are alternately pushed down with the feet, whereby the driving body 19 is continuously rotated in the direction of the arrow, and the bicycle advances forward.

  The bicycle drive mechanism according to the present invention forms a kind of lever crank mechanism as shown in FIG. That is, in FIG. 7, what is indicated by reference symbol a is a crank (driving body 19) that rotates about the rotation center 17 ′. In FIG. 7, what is indicated by a symbol b is a connecting node (connecting rod 13). In FIG. 7, what is indicated by reference symbol c is a lever that rotates around the center 31 of the arc-shaped pedal shaft guide hole 5 bulging forward. Although the lever c does not actually exist, in the lever crank mechanism, the pedal shaft 11 connected to the connecting node b is guided by the arc-shaped pedal shaft guide hole 5 to reach the center 31 of the pedal shaft guide hole 5. It is assumed that this c exists between the pedal shaft 11 and the center 31 of the pedal shaft guide hole 5 because it rotates as the rotation center. In FIG. 7, what is indicated by a symbol d is a fixed node formed by the body frame 1.

The relationship among the length of the crank a, the length of the connecting node b, the length of the lever c, and the length of the fixed node d in the bicycle according to the present invention is as follows.
a <b
a <c
a <d
a + d <(or =) b + c
(B−a) + d> (or =) c
(B−a) + c> (or =) d
(D−a) + c> (or =) b
(D−a) + b> (or =) c
a + b <(or =) c + d

DESCRIPTION OF SYMBOLS 1 Body frame 3 Guide cylinder 5 Pedal shaft guide hole 7 Connecting rod guide hole 9 Pedal 11 Pedal shaft 13 Connecting rod 13a Front end 13b Rear end 13a 'Rotation center 13b' Rotation center 15 Rear wheel 17 Axle 17 'Center 19 Driver 21 Support shaft 23 Long hole 25 Guide means 27 Cover 31 Center of pedal shaft guide hole a Crank b Connecting node c Lever d Fixed node

Claims (6)

  A guide cylinder is attached to each of the left and right sides of the vehicle body frame, an arcuate pedal shaft guide hole bulging forward is provided on the outer surface of each guide cylinder, and a connecting rod guide hole is provided on the rear side of each guide cylinder. A pedal shaft with a pedal attached is inserted into each pedal shaft guide hole, and connecting rods are arranged on both the left and right sides of the vehicle body frame, and the front end of each connecting rod is provided in each connecting rod guide hole. The front end of each connecting rod is attached to each pedal shaft so as to be pivotable in the vertical direction, a driving body is attached to both left and right ends of the rear wheel axle, and the rear end of each connecting rod is attached to each driving body. A bicycle characterized in that the rear wheel is rotated by attaching the left and right pedals in a substantially vertical direction along the pedal shaft guide hole so that the rear wheel can be rotated in the vertical direction.   The bicycle according to claim 1, wherein the guide tube has an arc shape bulging forward.   The bicycle according to claim 2, wherein each pedal shaft includes a sliding body that slides in the guide tube.   The bicycle according to any one of claims 1 to 3, wherein the driving body is a substantially disk-shaped body.   The bicycle according to any one of claims 1 to 4, characterized in that guide means having vertically elongated holes for guiding intermediate portions of the connecting rods are provided on both left and right sides of the vehicle body frame. The bicycle according to any one of claims 1 to 5, wherein a cover that covers the guide tube, the connecting rod, and the driving body is attached to both left and right side portions of the body frame.

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