WO2007027028A2

WO2007027028A2 - A bicycle overdriving apparatus having a crank shaft

Info

Publication number: WO2007027028A2
Application number: PCT/KR2006/003379
Authority: WO
Inventors: Jong Hyun Kim
Original assignee: Jong Hyun Kim
Priority date: 2005-08-30
Filing date: 2006-08-28
Publication date: 2007-03-08
Also published as: KR20050092357A; WO2007027028A3

Abstract

An apparatus for increasing a driving force of a bicycle by use of a crank shaft that can convert ascent/descent linear motion into rotary motion is disclosed. The apparatus includes a crank shaft structure installed to a bicycle, an extended crank shaft extended from a crank shaft and linearly moved up and down to rotate a rotor of the crank shaft, a pedal support of a rotor inserted in a space, which is formed on a front portion of the extended crank shaft, for driving the rotor, and rotary geared wheels installed to shafts of the rotor and rear wheel.

Description

Title : THE METHOD OF EQUIPMENT THE PROPULSION ON THE APPLICATION CRANK SHAFT FOR

BICYCLE

Technical Field

The present invention relates to an apparatus for

overdriving a bicycle employed as transportation means

or recreation means, and more particularly, to an

apparatus for increasing a driving force of a bicycle by

use of a crank shaft that can convert ascent/descent

linear motion into rotary motion.

Background Art

Bicycles are generally used on an even road or a

decline in the road as transportation means or race

means .

As shown in FIG.s 6 and 7, a user sits on a saddle

positioned at a proper middle position of a frame which

connects a front wheel with a rear wheel, and presses

down pedals of the bicycle. One rotary geared wheel is

fixed to a center portion of the rotor 1 at a position of a frame A, and another rotary geared wheel is fixed

to a shaft 3 of a rear wheel at a position of a frame B.

The rotary geared wheels are connected to each other by

means of a chain to rotate the rear wheel. A plurality

of large rotary geared wheels are provided on the rotor

1, and a plurality of small rotary geared wheels are

provided on the shaft 3 of the rear wheel. Consequently,

as the rotor (i.e., a pedal) is rotated in one turn, the

rear wheel can be rotated in one or two and half turns.

A rotary ratio of the rotor to the rear wheel is set

depending upon a peddling force of the rotor, a

traveling speed of the bicycle, and an inclined angle of

the road. However, it is difficult to drive the bicycle

with the peddling force of the rotor in case of a

gentile ascent in the road.

In order to solve the above problem, the applicant

developed an apparatus for increasing the driving force

of the bicycle, as shown in FIG. 5. Specifically, rotary

gears 9 are installed to left and right sides of the

shaft of a rear wheel. One end of a lever is engaged to

the rotary gear 9, and the other end is linearly moved up and down, thereby increasing the driving force.

However, the rotary gear 9 is rotated to a slight degree

by the lever. As the rotary gear 9 is rotated in one

turn, the lever is linearly moved up and down at several

times to rotate the rear wheel in one turn. It cannot be

used as a bicycle overdriving apparatus because of slow

rotating speed thereof.

Disclosure

Technical Problem

The present invention has been made in view of the

foregoing problems, and it is an object of the present

invention to provide a bicycle overdriving apparatus

capable of further increasing a driving force of a

bicycle by use of a crank shaft structure.

Technical Solution

In order to achieve the above objects, in one

aspect of the present invention, there is provided a

bicycle overdriving apparatus comprising: a crank shaft

structure installed to a bicycle; an extended crank shaft extended from a crank shaft and linearly moved up

and down to rotate a rotor of the crank shaft; a pedal

support of a rotor inserted in a space, which is formed

on a front portion of the extended crank shaft, for

driving the rotor; and rotary geared wheels installed to

shafts of the rotor and rear wheel, so that

ascent/descent linear motion of the crank shaft is

converted into a rotary motion.

Rotors are installed on left and right ends of a

center shaft of a rear wheel at a position of a frame.

Linear motion members are installed on left and right

frames at a position of a frame. The rotors are

connected to the linear motion members by means of

straight bars. The shaft is extended from a rotating

portion of the crank shaft towards a frame A to cause an

extended crank shaft to move up and down, thereby

rotating the rotor of the crank shaft.

A rotary geared wheel of a large diameter is

installed to the right side of the shaft of the rear

wheel, and a rotary geared wheel of a small diameter is

installed at a position of a right frame. A rotary geared wheel is installed to a right protruding portion

of the shaft of the rear wheel. The rotary geared wheel

of a large diameter is connected to the rotary geared

wheel of a small diameter by means of a chain, thereby

shifting the gears.

Therefore, the present invention can solve the

above problems of a conventional bicycle overdriving

apparatus in that it is difficult to drive the bicycle a

the peddling force of the rotor in case of a gentile

ascent in the road and in that rotary gears installed on

left and right sides of the shaft of a rear wheel by

means of a lever.

In order to convert an ascent/descent linear

motion of the crank shaft into a rotary motion, a space

is formed on the front portion of the extended crank

shaft, and the rotors are mounted on left and right

sides of the frame. A pedal support is inserted in the

space of the extended crank shaft. If the rotor is

rotated, an extended crank shaft is linearly moved up

and down. For the structure of converting the

ascent/descent linear motion of the extended crank shaft into the rotary motion, the rotary geared wheels are

installed to the left and right sides of the center

shaft of the rotary and the left and right sides of the

center shaft of the rear wheel to assist the rotary

motion of the crank shaft. According to the use of the

bicycle, when the driving force of the crank shaft is

not required, the extended crank shaft may be detached

so that the bicycle is driven by the rotary geared

wheels .

Advantageous Effects

According to the bicycle overdriving apparatus of

the present invention, the rotors are installed to the

left and right sides of the shaft of the rear wheel, and

the linear motion members are installed to left and

right middle frames. The portion extended from the crank

shaft is linearly moved up and down to rotate the rotor

of the crank shaft. As a result, when the bicycle is

driven on an even road or a decline in the road, the

bicycle can be well driven with a mild force in

proportion to a conventional apparatus. Brief Description of the Drawings

The foregoing and other objects, features and

advantages of the present invention will become more

apparent from the following detailed description when

taken in conjunction with the accompanying drawings in

which :

FIG. 1 is a left perspective view illustrating a

bicycle overdriving apparatus including a crank shaft;

FIG. 2 is a right perspective view illustrating a

bicycle overdriving apparatus including a crank shaft;

FIG. 3 is a plan view illustrating a rotor engaged

to a crank shaft;

FIG. 4 is a plan view illustrating an extended

crank shaft;

FIG. 5 is a left cross-sectional view illustrating

a bicycle overdriving apparatus including a lever; and

FIGs. 6 and 7 are left cross-sectional view

illustrating a conventional bicycle overdriving

apparatus. Best Mode

Reference will now be made in detail to the

preferred embodiment of the present invention.

A bicycle overdriving apparatus of the present

invention is used for a bicycle employed as

transportation means, race means, or recreation means,

in which a user sits on a saddle positioned at a proper

middle position of a frame which connects a front wheel

with a rear wheel, and presses down pedals of the

bicycle.

As shown in FIGs. 1 to 4, rotors 4 are installed

on left and right ends of a center shaft 3 of the rear

wheel at a position of a frame B. Linear motion members

5 are installed on left and right frames at a position

of a frame C. The rotors 4 are connected to the linear

motion members 5 by means of straight bars 6. A crank

shaft motion unit is composed of the rotors 4, the

linear motion members 5, and the straight bars 6.

According to a method of driving the bicycle by

use of the overdriving apparatus, the shaft is extended

from a rotating portion of the crank shaft towards a frame A to cause an extended crank shaft 7 to move up

and down, thereby rotating the rotor 4 of the crank

shaft. A rotary geared wheel is inserted into the right

side of the center shaft of the rear wheel at the.

position of the frame B so that the rear wheel of the

bicycle is rotated by the rotating force. Also, a rotary

geared wheel is installed at a position of a frame D,

and an outer periphery of the center shaft 3 of the rear

wheel. Consequently, the dimensions of the rotary geared

wheels are set so that as the rotary 4 of the crank

shaft is rotated in one turn, the rear wheel can be

rotated in three turns. The extended crank shaft 7 is

slowly paddled to drive the bicycle. In case of a

gentile ascent in the road, the user can drive the

bicycle with a mild force.

If the drive force is further increased in the

above structure, a diameter of the front wheel is

decreased to cause the extended crank shaft 7 to further

lengthen.

In order to convert the ascent/descent linear

motion into a rotary motion, a space is formed on the front portion of the extended crank shaft 7, and the

rotors 1 are mounted on left and right sides of the

frame A. A pedal support 2 is inserted in the space of

the extended crank shaft 7. If the rotor 1 is rotated,

the extended crank shaft 7 is linearly moved up and

down. In this instance, when the rotor 1 is rotated in a

rear direction, the pedal support 2 is not smoothly

rotated.

In order to solve the above problem, the straight

portion of the rotary 1 can be folded and unfolded to

cause the rotor 1 is smoothly rotated.

For the structure of converting the ascent/descent

linear motion of the extended crank shaft 7 into the

rotary motion, the rotary geared wheels are installed to

the left and right sides of the center shaft of the

rotary 1 and the left and right sides of the center

shaft of the rear wheel to assist the rotary motion of

the crank shaft 4. According to the use of the bicycle,

when the driving force of the crank shaft is not

required, the extended crank shaft 7 may be detached so

that the bicycle is driven by the rotary geared wheels. Industrial Applicability

As can be seen from the foregoing, the rotors are

installed to the left and right sides of the shaft of

the rear wheel, and the linear motion members are

installed to left and right middle frames. The portion

extended from the crank shaft is linearly moved up and

down to rotate the rotor of the crank shaft.

While this invention has been described in

connection with what is presently considered to be the

most practical and preferred embodiment, it is to be

understood that the invention is not limited to the

disclosed embodiment and the drawings. On the contrary,

it is intended to cover various modifications and

variations within the spirit and scope of the appended

claims .

Claims

1. A bicycle overdriving apparatus comprising:

a crank shaft structure installed to a bicycle;

an extended crank shaft extended from a crank

shaft and linearly moved up and down to rotate a rotor

of the crank shaft;

a pedal support of a rotor inserted in a space,

which is formed on a front portion of the extended crank

shaft, for driving the rotor; and

rotary geared wheels installed to shafts of the

rotor and rear wheel, so that ascent/descent linear

motion of the crank shaft is converted into a rotary

motion.