JPH10218072A - Slide hook gear which utilizes weight effectively and continuously in pedaling drive of bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To utilize weight effectively for stepping force given to a pedal by forming a groove in the direction of diameter in which a hook slides in right and left chain rings which have a central shaft in common and constituting in such a manner that a rotation speed can be changed cyclically while the pedal rotates by one revolution. SOLUTION: When a pedal 6 is stepped on and a crank 5 is rotated, right and left hooks 3 which are engaged with a groove 2 formed in the direction of diameter in right and left chain rings 1 move in such a manner that they trace a circular path centered on a rotary shaft 11 of the crank 5 and are at symmetrical positions centered on a rotary shaft 10 of the chain ring 1. Consequently, when the chain rings 1 rotate at a fixed speed, a rotation speed of the pedal 6 is changed cyclically while the pedal 6 rotates by one revolution, and either of the right and left pedals 6 is always positioned at an angle within a fixed angle less than 180 degrees centered on the rotary shaft. The relations between a distance between the rotary shafts 10 and 11 of the chain rings 1 and the crank 5 and a radius of rotation of the hooks 3 can be adjusted freely to adjust a pedal stepping angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide hook gear that keeps making effective use of weight in transmitting power from left and right cranks to a chain ring of a rotary pedaling drive portion of a bicycle or the like.

[0002]

2. Description of the Related Art Left and right cranks and a chain ring of a rotary pedal drive portion of a conventional bicycle or the like which is rowed by human power are integrated.

[0003]

In conventional bicycles, rickshaws, rickshaw airplanes and the like to which pedals are applied, when pedaling, the pedal position immediately before and after reaching the highest point and immediately before reaching the lowest point. -Immediately after, the direction of gravity is almost perpendicular to the direction of rotation, so applying weight alone does not produce a strong rotational force, immediately after reaching the highest point, immediately forward, immediately after reaching the lowest point, immediately after reaching the lowest point. You need to work backwards. And, when one of the left and right pedals is in this range, the other pedal is always in this range. Therefore, there is a problem that the rotational force is reduced when the pedal is in this range.

[0004] It is an object of the present invention to be able to always efficiently connect the weight to the rotational force when pedaling a bicycle or the like.

[Means for Solving the Problems]

In order to achieve the above object, in the rotary pedal drive portion of the present invention, the left and right cranks and the rotation axis of the chain ring are separated into three. The rotation axes (11) of the left and right cranks are on the same straight line. The axis of rotation (10) of the chain ring is parallel to this, but in a different position.

The left and right cranks (5) have small cranks (4) and hooks (3) with a structure in which the cranks and pedals are made smaller with the rotary bearings interposed therebetween. The hook fits into a groove (2) drilled outward from near the center of the chain ring (1). The rotation axis (10) of the chain ring is positioned inside the rotation path (12) of the hook so that the rotation path of the hook is inside the rotation path of the outer edge of the groove of the chain ring. When the crank rotates, the hook rotates in the groove, rotating the chain ring.

[0007] In order that the left and right cranks (5) and the chain ring can rotate freely, the chain ring is formed by laminating two disks with a cylinder interposed therebetween, and receives the cylindrical portion serving as a shaft with a bearing. The grooves of the chain ring are symmetrical with respect to the rotation axis, one each on the left and right.

[0008] The outer edge of one of the disks of the chain ring is the portion where the chain is hung. Therefore, the other disk may not be provided except for the shaft and the groove.

In the above structure, the pedal (6)
When the crank (5) is rotated by stepping on, as shown in FIG.
, And the left and right hooks are always located symmetrically about the rotation axis (10) of the chain ring. When the chain ring rotates at a constant speed, the pedal periodically changes its rotation speed during one revolution. As a result, one of the left and right pedals always moves as if it were within a certain angle (A) of 180 degrees or less about the rotation axis.

[0010] By adjusting the relationship between the distance between the rotation axis (10) of the chain ring and the rotation axis (11) of the crank and the rotation radius of the hook, one of the left and right pedals must be at a constant angle about the rotation axis. You can adjust its angle inside.

By adjusting the angle of the rotation direction of the crank (5) and the hook (3) or the direction in which the axis (10) of the chain ring and the axis (11) of the crank are shifted,
Either of the left and right pedals (6) can adjust the angle, which is within a certain angle about the rotation axis, in any direction from the center of rotation of the pedal. Set to a position that can be used for rotational force. That is, it is set on a line extending horizontally forward from the center of rotation of the pedal.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. In FIG. 1, the main parts are a chain ring (1) (FIG. 4), a frame (7) (FIG. 5), and a crank (3, 4, 5) integrated with the right small crank hook (FIG. 6). , The right pedal (6) (FIG. 6),
A crank integrated with the left small crank hook (3,
4, 5) (FIG. 7) and the left pedal (6) (FIG. 7).

The frame (7) has three parallel bearings. The axes of rotation of the outer bearings are collinear.

The chain ring is formed by stacking two disks with a cylindrical shape interposed therebetween. The two discs are grooved wide enough to allow the hooks to enter from near the center to the outside. When the disk is seen from the side,
It is located symmetrically around the center.

The left and right hooks are fitted into the grooves of the chain ring so as to sandwich the chain ring from the left and right. It is preferable that the hook rotates freely.

The slide hook gear device as described above is mounted on a pedal drive portion of a bicycle as shown in FIG.

[0017]

Since the present invention is configured as described above, it has the following effects.

When this device is mounted on a bicycle or the like,
There is no moment when one pedal is at the highest point and the other pedal is at the lowest point. When one of the pedals is depressed to the lowest point, the other pedal has already passed the highest point, and the pedal has come to a position where it is easy to make use of the weight when depressing, so that the weight can be efficiently converted to rotational force.

[Brief description of the drawings]

FIG. 1 is a plan view (a) and a side view (b) showing a mechanism of a slide hook gear attached to a pedal drive portion.

FIG. 2 is a diagram showing how the pedal moves when the chain ring rotates by 45 degrees and makes one rotation.

FIGS. 3A and 3B are a side view showing a state of a slide hook gear attached to a bicycle and a plan view of a side view of the slide hook gear viewed from below in a dotted line.

FIG. 4 is a plan view (a) and a side view (b) of a chain ring.
It is.

FIG. 5 is a plan view (a) and a side view (b) of a frame.

FIG. 6 is a plan view (a) and a side view (b) of the right pedal, crank, small crank, and hook.

FIG. 7 is a plan view (a) and a side view (b) of a left pedal, crank, small crank, and hook.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chain ring 2 Groove 3 Hook 4 Small crank 5 Crank 6 Pedal 7 Frame 8 Chain ring bearing 9 Crank bearing 10 Chain ring rotation axis 11 Crank rotation axis 12 Hook rotation orbit

Claims (2)

[Claims] (1) Two large disks sharing a central axis and a column have a shape in which the cylinders overlap each other, and the left and right disks each have a groove for the hook to slide radially from near the center. A chain ring with a structure in which the left and right grooves are located symmetrically about the center of the rotation axis. 2. The chain ring (1) according to claim 1 is combined such that left and right hooks sharing a rotation axis parallel thereto are sandwiched from right and left, and a hook (3) fitted in a groove (2) is provided. A slide hook gear structure that rotates the chain ring while sliding in the groove.