WO2000061429A1 - Device for driving bicycle by both forward and backward rotation of pedal - Google Patents

Device for driving bicycle by both forward and backward rotation of pedal Download PDF

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Publication number
WO2000061429A1
WO2000061429A1 PCT/KR2000/000241 KR0000241W WO0061429A1 WO 2000061429 A1 WO2000061429 A1 WO 2000061429A1 KR 0000241 W KR0000241 W KR 0000241W WO 0061429 A1 WO0061429 A1 WO 0061429A1
Authority
WO
WIPO (PCT)
Prior art keywords
idle gear
pedal
ratchet
rotating plate
manner
Prior art date
Application number
PCT/KR2000/000241
Other languages
French (fr)
Inventor
Jin Wook Kim
Original Assignee
Jin Wook Kim
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR2019990017356U external-priority patent/KR200167316Y1/en
Application filed by Jin Wook Kim filed Critical Jin Wook Kim
Priority to AU34610/00A priority Critical patent/AU3461000A/en
Publication of WO2000061429A1 publication Critical patent/WO2000061429A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
    • B62M11/04—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio
    • B62M11/14—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with planetary gears
    • B62M11/145—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with planetary gears built in, or adjacent to, the bottom bracket
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M1/00—Rider propulsion of wheeled vehicles
    • B62M1/36—Rider propulsion of wheeled vehicles with rotary cranks, e.g. with pedal cranks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
    • B62M11/04—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio
    • B62M11/06—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with spur gear wheels

Definitions

  • the present invention relates to a pedaling device of a bicycle, and more particularly, the present invention relates to a device for driving a bicycle by both forward and backward rotation of a pedal, which enables the bicycle to be always driven forward when a bicycle rider rotates the pedal in a forward or backward direction.
  • a bicycle pedal which is increased in its length upon being stepped for driving forward the bicycle and thereby is elevated in its backward driving force
  • a pedaling device which enables a bicycle to be driven forward even when a pedal is rotated backward
  • an object of the present invention is to provide a device for driving a bicycle by both forward and backward rotation of a pedal, which is obtained by improving a structure of the conventional device capable of driving forward a bicycle through manipulation of a forward and backward rotation adjusting lever, whereby a simple and efficient structure is accomplished.
  • Another object of the present invention is to provide a device for driving a bicycle by both forward and backward rotation of a pedal, which enables the bicycle to be always driven forward when a bicycle rider rotates the pedal in a forward or backward direction, without the aid of a forward and backward rotation adjusting lever, and which is easily fabricated and minimizes a breakdown rate.
  • a device for driving a bicycle by both forward and backward rotation of a pedal comprising: a rotating direction determining section for transmitting driving force of a pedal shaft and automatically determining a rotating direction of the pedal shaft; and a rotating direction converting section for converting backward rotating force of the pedal into forward driving force.
  • the rotating direction determining section comprises a driving drum assembled to the pedal shaft and having one end which is closed and the other end which is opened and is formed with an inward flange, a pawl shaft received in and fastened to the driving drum in a manner such that the pawl shaft can be seesaw moved, the pawl shaft having first and second pawls, and first and second ratchet wheels arranged inside the driving drum in a manner such that the first and second ratchet wheels correspond to the first and second pawls, respectively, of the pawl shaft, the first and second ratchet wheels having ratchet teeth which are formed on circumferential outer surfaces thereof and spur teeth which are formed on circumferential inner surfaces thereof, the ratchet teeth of the first and second ratchet wheels being capable of being engaged by the first and second pawls in directions, respectively, which are opposite to each other, the second ratchet wheel having a sprocket which is secured to one end of the second ratchet
  • the rotating direction converting section comprises a first rotating plate seated on a bottom surface of the driving drum in a state in which a bearing is intervened between the first rotating plate and the bottom surface of the driving drum, the first rotating plate having a pedal shaft tube which is fitted through a center portion of the first rotating plate in a manner such that it axially projects from one surface of the first rotating plate and two pairs of idle gear shafts which are fastened to the one surface of the first rotating plate around the pedal shaft tube in a manner such that they axially project from the one surface of the first rotating plate, each pair of idle gear shafts having first and second idle gears which are respectively fitted therearound, and a second rotating plate for covering the first rotating plate in a manner such that distal ends of the pedal shaft tube and the two pairs of idle gear shafts are fastened to the second rotating plate.
  • the first and second pawls of the pawl shaft comprise forward and backward rotating pawls, respectively, which are coupled to the pawl shaft at a distance from each other in a manner such that they extend in directions, respectively, which are opposite to each other.
  • the first and second ratchet wheels are close to each other, with a bearing intervened therebetween, in a manner such that they can be seesaw moved, ratchet teeth circles of the first and second ratchet wheels have the same diameter, the ratchet teeth of the first and second ratchet wheels are formed in a manner such that they can be engaged by the first and second pawls in directions, respectively, which are opposite to each other, and spur teeth circles of the first and second ratchet wheels have different diameters.
  • the first idle gear has a diameter which is greater than that of the second idle gear and a length which is a half of that of the second idle gear, the first idle gear is fitted around one of each pair of idle gear shafts along with a spacer ring, and the second idle gear is independently fitted around the other of each pair of idle gear shafts, the first idle gear and the second idle gear being meshed with each other.
  • the first idle gear is meshed with the spur teeth which are formed on the circumferential inner surface of the second ratchet wheel
  • the second idle gear is meshed with the spur teeth which are formed on the circumferential inner surface of the first ratchet wheel.
  • FIG. 1 is an exploded perspective view of a device for driving a bicycle by forward and backward rotation of a pedal, in accordance with an embodiment of the present invention
  • FIG. 2 is a cross-sectional view illustrating a state wherein the device according to the present invention is mounted to a pedal shaft of a bicycle;
  • FIG. 3 is a partial enlarged cross-sectional view illustrating main components of the device " according to the present invention.
  • FIG. 4 is a partial enlarged perspective view for showing a driving force transmitting path and for explaining rotating direction conversion in the device according to the present invention.
  • a device for driving a bicycle by forward and backward rotation of a pedal in accordance with an embodiment of the present invention, is mounted along with a transmission gear, to a pedal shaft 2 of a bicycle. Therefore, it is to be readily understood that, by replacing the conventional pedal shaft with a slightly longer pt-dal shaft, the device according to the present invention can be mounted to the conventional bicycle in an easy manner.
  • FIG. 1 Structural components of the device according to the present invention are best shown in FIG. 1, and an assembled state is best shown in FIG. 3.
  • a pedal arm 1 is coupled to a right end of the pedal shaft 2, and a driving drum 3 is mounted to the pedal shaft 2.
  • a right end of the driving drum 3 is closed and a left end of the driving drum 3 is opened.
  • the structural components of the device according to the present invention are received in the driving drum 3 through the opened left end of the driving drum 3. If the pedal shaft 2 is rotated, the driving drum 3 is also integrally rotated therewith.
  • the left end of the driving drum 3 is formed with an inward flange 4.
  • a pawl shaft 5 is received in the driving drum 3. Both ends of the pawl shaft 5 are fastened to the inward flange 4 and a bottom wall of the driving drum 3, respectively.
  • the pawl shaft 5 has a forward rotating pawl 6 and a backward rotating pawl 7.
  • the forward and backward rotating pawls 6 and 7 are coupled to the pawl shaft 5 in a state wherein they are spaced apart from each other by a predetermined distance and in a manner such that they extend in directions, respectively, which are opposite to each other.
  • the forward and backward rotating pawls 6 and 7 are seesaw moved about the pawl shaft 5.
  • a bearing 8, a washer 9 and a first rotating plate 10 are sequentially received in the driving drum 3 through the opened left end of the driving drum 3.
  • a pedal shaft tube 13 is fitted through a center portion of the first rotating plate 10.
  • Two pairs of idle gear shafts 11 are fastened to a left surface of the first rotating plate 10 around the pedal shaft tube 13 in a manner such that the two pairs are opposed to each other.
  • a spacer ring 12 is fitted around one of each pair of idle gear shafts 11.
  • a first idle gear 14 is fitted around the one idle gear shaft 11 around which the spacer ring 12 is fitted.
  • a second idle gear 15 is fitted around the other of each pair of idle gear shafts
  • the first idle gear 14 has a diameter which is greater than that of the second idle gear 15 and a length which is less than that of the second idle gear
  • a combination of the spacer ring 12 and the first idle gear 14 has a length which is the same as that of the second idle gear 15.
  • the first idle gear 14 and the second idle gear 15 which are fitted around each pair of idle gear shafts 11, respectively, are meshed with each other.
  • a first ratchet wheel 16 which is meshed with two second idle gears 15 and a second ratchet wheel 17 which is meshed with two first idle gears 14, are formed with spur teeth 18 on their circumferential inner surfaces.
  • Spur teeth circles of the first and second ratchet wheels 16 and 17 have diameters which are different from each other.
  • the first and second ratchet wheels 16 and 17 are formed with ratchet teeth on their circumferential outer surfaces.
  • the ratchet teeth of the first and second ratchet wheels 16 and 17 are formed in a manner such that they can be engaged by the backward and forward rotating pawls 7 and 6 in directions, respectively, which are opposite to each other.
  • the second ratchet wheel 17 has a driving or transmitting sprocket 19 which is secured to a left end of the second ratchet wheel 17 in a manner such that the sprocket 19 extends along a circumferential direction.
  • a second rotating plate 20 is mounted to left surfaces of the second ratchet wheel 17 and the sprocket 19, a construction of the device according to the present invention is completed.
  • Distal, that is, left ends of the two pairs of idle gear shafts 11 are fitted into four shaft grooves, respectively, which are defined in the second rotating plate 20.
  • Bearings are intervened between the first ratchet wheel 16 and the second ratchet wheel 17, between the first rotating plate 10 and the first ratchet wheel 16, and between the second ratchet wheel 17 and the second rotating plate 20, respectively, so as to reduce frictional resistance which is generated therebetween.
  • the bicycle is always driven forward not only by forward rotation of the pedal, but also by backward rotation of the pedal.
  • an operational principle of the device according to the present invention will be described in detail with reference to FIG. 4.
  • the pedal is rotated in a forward direction (i.e., a clockwise direction in FIG. 4)
  • the forward rotating pawl 6 which is arranged inside the driving drum 3, rotates the second ratchet wheel 17 in the clockwise direction.
  • the sprocket 19 which is integrally coupled to the second ratchet wheel 17, is also rotated forward.
  • the sprocket 19 is always rotated forward when the bicycle rider rotates the pedal in the forward direction and in the backward direction.
  • the device according to the present invention provides advantages in that, since the device is composed of twenty structural components, a simple structure is accomplished and it is possible to drive forward a bicycle not only by forward rotation of a pedal, but also by backward rotation of the pedal without using a forward and backward rotation adjusting lever, whereby the number of components is decreased, a simple structure is realized, a fabricating cost is reduced and a breakdown rate is lessened. Moreover, bothersomeness which is caused by manipulation of the forward and backward rotation adjusting lever, is eliminated.
  • the bicycle can be driven forward even by the backward rotation of the pedal, as a muscular motion is activated in a backward direction, fatigue of muscle can be easily relieved, and interest and curiosity of not only a bicycle rider, but also a bystander can be stimulated.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)

Abstract

Disclosed is a device for driving a bicycle by both forward and backward rotation of a pedal. The device comprises a rotating direction determining section for transmitting driving force of a pedal shaft and automatically determining a rotating direction of the pedal shaft; and a rotating direction converting section for converting backward rotating force of the pedal into forward driving force. The rotating direction determining section includes two pawls which are coupled to a pawl shaft at a distance from each other in a manner such that they extend in directions, respectively, which are opposite to each other, and two ratchet wheels which have ratchet teeth formed on circumferential outer surfaces thereof and spur teeth formed on circumferential inner surfaces thereof, the ratchet teeth of the two ratchet wheels being capable of being engaged by the two pawls in directions, respectively, which are opposite to each other. Idle gears which have different diameters and lengths, are meshed with the spur teeth of the two ratchet wheels.

Description

DEVICE FOR DRIVING BICYCLE BY BOTH FORWARD AND BACKWARD ROTATION OF PEDAL
Technical Field
The present invention relates to a pedaling device of a bicycle, and more particularly, the present invention relates to a device for driving a bicycle by both forward and backward rotation of a pedal, which enables the bicycle to be always driven forward when a bicycle rider rotates the pedal in a forward or backward direction.
Background Art
Nowadays, a bicycle reaches the stage of perfection in its mechanical structure, and it is estimated that it is difficult to expect a further structural development in a bicycle. In this regard, a bicycle pedal which is increased in its length upon being stepped for driving forward the bicycle and thereby is elevated in its backward driving force, and a pedaling device which enables a bicycle to be driven forward even when a pedal is rotated backward, are disclosed in the art. Specifically, in the latter case, when a separate lever is moved forward, the conventional bicycle structure is induced, and on the contrary, when the separate lever is moved backward, the bicycle is driven forward even when the pedal is rotated backward. Hence, as a bicycle rider manipulates a forward and backward rotation adjusting lever as if he or she operates a transmission shift lever, it is possible to drive forward the bicycle through backward rotation of the pedal.
Disclosure of the Invention Accordingly, the present invention has been made in an effort to solve the problems occurring in the related art, and an object of the present invention is to provide a device for driving a bicycle by both forward and backward rotation of a pedal, which is obtained by improving a structure of the conventional device capable of driving forward a bicycle through manipulation of a forward and backward rotation adjusting lever, whereby a simple and efficient structure is accomplished. Another object of the present invention is to provide a device for driving a bicycle by both forward and backward rotation of a pedal, which enables the bicycle to be always driven forward when a bicycle rider rotates the pedal in a forward or backward direction, without the aid of a forward and backward rotation adjusting lever, and which is easily fabricated and minimizes a breakdown rate.
In order to achieve the above objects, according to one aspect of the present invention, there is provided a device for driving a bicycle by both forward and backward rotation of a pedal, the device comprising: a rotating direction determining section for transmitting driving force of a pedal shaft and automatically determining a rotating direction of the pedal shaft; and a rotating direction converting section for converting backward rotating force of the pedal into forward driving force. According to another aspect of the present invention, the rotating direction determining section comprises a driving drum assembled to the pedal shaft and having one end which is closed and the other end which is opened and is formed with an inward flange, a pawl shaft received in and fastened to the driving drum in a manner such that the pawl shaft can be seesaw moved, the pawl shaft having first and second pawls, and first and second ratchet wheels arranged inside the driving drum in a manner such that the first and second ratchet wheels correspond to the first and second pawls, respectively, of the pawl shaft, the first and second ratchet wheels having ratchet teeth which are formed on circumferential outer surfaces thereof and spur teeth which are formed on circumferential inner surfaces thereof, the ratchet teeth of the first and second ratchet wheels being capable of being engaged by the first and second pawls in directions, respectively, which are opposite to each other, the second ratchet wheel having a sprocket which is secured to one end of the second ratchet wheel in a manner such that the sprocket extends along a circumferential direction.
According to another aspect of the present invention, the rotating direction converting section comprises a first rotating plate seated on a bottom surface of the driving drum in a state in which a bearing is intervened between the first rotating plate and the bottom surface of the driving drum, the first rotating plate having a pedal shaft tube which is fitted through a center portion of the first rotating plate in a manner such that it axially projects from one surface of the first rotating plate and two pairs of idle gear shafts which are fastened to the one surface of the first rotating plate around the pedal shaft tube in a manner such that they axially project from the one surface of the first rotating plate, each pair of idle gear shafts having first and second idle gears which are respectively fitted therearound, and a second rotating plate for covering the first rotating plate in a manner such that distal ends of the pedal shaft tube and the two pairs of idle gear shafts are fastened to the second rotating plate.
According to another aspect of the present invention, the first and second pawls of the pawl shaft comprise forward and backward rotating pawls, respectively, which are coupled to the pawl shaft at a distance from each other in a manner such that they extend in directions, respectively, which are opposite to each other. According to another aspect of the present invention, the first and second ratchet wheels are close to each other, with a bearing intervened therebetween, in a manner such that they can be seesaw moved, ratchet teeth circles of the first and second ratchet wheels have the same diameter, the ratchet teeth of the first and second ratchet wheels are formed in a manner such that they can be engaged by the first and second pawls in directions, respectively, which are opposite to each other, and spur teeth circles of the first and second ratchet wheels have different diameters.
According to still another aspect of the present invention, the first idle gear has a diameter which is greater than that of the second idle gear and a length which is a half of that of the second idle gear, the first idle gear is fitted around one of each pair of idle gear shafts along with a spacer ring, and the second idle gear is independently fitted around the other of each pair of idle gear shafts, the first idle gear and the second idle gear being meshed with each other.
According to yet still another aspect of the presenc invention, the first idle gear is meshed with the spur teeth which are formed on the circumferential inner surface of the second ratchet wheel, and the second idle gear is meshed with the spur teeth which are formed on the circumferential inner surface of the first ratchet wheel.
Brief Description of the Drawings The above objects, and other features and advantages of the present invention will become more apparent after a reading of the following detailed description when taken in conjunction with the drawings, in which:
FIG. 1 is an exploded perspective view of a device for driving a bicycle by forward and backward rotation of a pedal, in accordance with an embodiment of the present invention;
FIG. 2 is a cross-sectional view illustrating a state wherein the device according to the present invention is mounted to a pedal shaft of a bicycle;
FIG. 3 is a partial enlarged cross-sectional view illustrating main components of the device" according to the present invention; and
FIG. 4 is a partial enlarged perspective view for showing a driving force transmitting path and for explaining rotating direction conversion in the device according to the present invention.
Best Mode for Carrying Out the Invention Reference will now be made in greater detail to a preferred embodiment of the invention, an example of which is illustrated in the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings and the description to refer to the same or like parts.
A device for driving a bicycle by forward and backward rotation of a pedal, in accordance with an embodiment of the present invention, is mounted along with a transmission gear, to a pedal shaft 2 of a bicycle. Therefore, it is to be readily understood that, by replacing the conventional pedal shaft with a slightly longer pt-dal shaft, the device according to the present invention can be mounted to the conventional bicycle in an easy manner.
Structural components of the device according to the present invention are best shown in FIG. 1, and an assembled state is best shown in FIG. 3. A pedal arm 1 is coupled to a right end of the pedal shaft 2, and a driving drum 3 is mounted to the pedal shaft 2. A right end of the driving drum 3 is closed and a left end of the driving drum 3 is opened. The structural components of the device according to the present invention are received in the driving drum 3 through the opened left end of the driving drum 3. If the pedal shaft 2 is rotated, the driving drum 3 is also integrally rotated therewith.
The left end of the driving drum 3 is formed with an inward flange 4. A pawl shaft 5 is received in the driving drum 3. Both ends of the pawl shaft 5 are fastened to the inward flange 4 and a bottom wall of the driving drum 3, respectively. The pawl shaft 5 has a forward rotating pawl 6 and a backward rotating pawl 7. The forward and backward rotating pawls 6 and 7 are coupled to the pawl shaft 5 in a state wherein they are spaced apart from each other by a predetermined distance and in a manner such that they extend in directions, respectively, which are opposite to each other. The forward and backward rotating pawls 6 and 7 are seesaw moved about the pawl shaft 5.
A bearing 8, a washer 9 and a first rotating plate 10 are sequentially received in the driving drum 3 through the opened left end of the driving drum 3. A pedal shaft tube 13 is fitted through a center portion of the first rotating plate 10. Two pairs of idle gear shafts 11 are fastened to a left surface of the first rotating plate 10 around the pedal shaft tube 13 in a manner such that the two pairs are opposed to each other. A spacer ring 12 is fitted around one of each pair of idle gear shafts 11. A first idle gear 14 is fitted around the one idle gear shaft 11 around which the spacer ring 12 is fitted. A second idle gear 15 is fitted around the other of each pair of idle gear shafts
11. The first idle gear 14 has a diameter which is greater than that of the second idle gear 15 and a length which is less than that of the second idle gear
15. When the spacer ring 12 and the first idle gear 14 are fitted around the one idle gear shaft 11 and the second idle gear 15 is fitted around the other idle gear shaft 11, a combination of the spacer ring 12 and the first idle gear 14 has a length which is the same as that of the second idle gear 15. The first idle gear 14 and the second idle gear 15 which are fitted around each pair of idle gear shafts 11, respectively, are meshed with each other. A first ratchet wheel 16 which is meshed with two second idle gears 15 and a second ratchet wheel 17 which is meshed with two first idle gears 14, are formed with spur teeth 18 on their circumferential inner surfaces.
Spur teeth circles of the first and second ratchet wheels 16 and 17 have diameters which are different from each other. The first and second ratchet wheels 16 and 17 are formed with ratchet teeth on their circumferential outer surfaces. The ratchet teeth of the first and second ratchet wheels 16 and 17 are formed in a manner such that they can be engaged by the backward and forward rotating pawls 7 and 6 in directions, respectively, which are opposite to each other. The second ratchet wheel 17 has a driving or transmitting sprocket 19 which is secured to a left end of the second ratchet wheel 17 in a manner such that the sprocket 19 extends along a circumferential direction.
By the fact that a second rotating plate 20 is mounted to left surfaces of the second ratchet wheel 17 and the sprocket 19, a construction of the device according to the present invention is completed. Distal, that is, left ends of the two pairs of idle gear shafts 11 are fitted into four shaft grooves, respectively, which are defined in the second rotating plate 20. Bearings are intervened between the first ratchet wheel 16 and the second ratchet wheel 17, between the first rotating plate 10 and the first ratchet wheel 16, and between the second ratchet wheel 17 and the second rotating plate 20, respectively, so as to reduce frictional resistance which is generated therebetween.
By the device according to the present invention, constructed as mentioned above, the bicycle is always driven forward not only by forward rotation of the pedal, but also by backward rotation of the pedal. Hereinafter, an operational principle of the device according to the present invention will be described in detail with reference to FIG. 4.
If the pedal is rotated in a forward direction (i.e., a clockwise direction in FIG. 4), as the driving drum 3 is rotated forward, the forward rotating pawl 6 which is arranged inside the driving drum 3, rotates the second ratchet wheel 17 in the clockwise direction. As a consequence, the sprocket 19 which is integrally coupled to the second ratchet wheel 17, is also rotated forward.
In succession, when the second ratchet wheel 17 is rotated in the clockwise direction, the first idle gear
14 is rotated in the clockwise direction, the second idle gear 15 which is meshed with the first idle gear 14, is rotated in a counterclockwise direction, and then the first ratchet wheel 16 which is meshed with the second idle gear 15, is rotated in the counterclockwise direction. However, this counterclockwise rotation of the first ratchet wheel 16 does not exert any adverse influence on the driving of the bicycle.
In the meanwhile, if the pedal is rotated backward (i.e., the counterclockwise direction in FIG. 4), as the driving drum 3 is rotated backward, the backward rotating pawl 7 which is arranged inside the driving drum 3, rotates the first ratchet wheel 16 in the counterclockwise direction. If the first ratchet wheel 16 is rotated in the counterclockwise direction, the second idle gear 15 is also rotated in the counterclockwise direction, and the first idle gear 14 which is meshed with the second idle gear 15, is rotated in the clockwise direction. Accordingly, the second ratchet wheel 17 which is meshed with the first idle gear 14, is rotated in the clockwise direction, and the sprocket 19 which is integrally coupled to the second ratchet wheel 17 is rotated forward.
As can be readily seen from the above descriptions, the sprocket 19 is always rotated forward when the bicycle rider rotates the pedal in the forward direction and in the backward direction.
Industrial Applicability
As a result, the device according to the present invention provides advantages in that, since the device is composed of twenty structural components, a simple structure is accomplished and it is possible to drive forward a bicycle not only by forward rotation of a pedal, but also by backward rotation of the pedal without using a forward and backward rotation adjusting lever, whereby the number of components is decreased, a simple structure is realized, a fabricating cost is reduced and a breakdown rate is lessened. Moreover, bothersomeness which is caused by manipulation of the forward and backward rotation adjusting lever, is eliminated. Furthermore, due to the fact that the bicycle can be driven forward even by the backward rotation of the pedal, as a muscular motion is activated in a backward direction, fatigue of muscle can be easily relieved, and interest and curiosity of not only a bicycle rider, but also a bystander can be stimulated.

Claims

Claims
1. A device for driving a bicycle by both forward and backward rotation of a pedal, the device comprising: a rotating direction determining section for transmitting driving force of a pedal shaft and automatically determining a rotating direction of the pedal shaft; and a rotating direction converting section for converting backward rotating force of the pedal into forward driving force.
2. The device as claimed in claim 1, wherein the rotating direction determining section comprises a driving drum assembled to the pedal shaft and having one end which is closed and the other end which is opened and is formed with an inward flange, a pawl shaft received in and fastened to the driving drum in a manner such that the pawl shaft can be seesaw moved, the pawl shaft having first and second pawls, and first and second ratchet wheels arranged inside the driving drum in a manner such that the first and second ratchet wheels correspond to the first and second pawls, respectively, of the pawl shaft, the first and second ratchet wheels having ratchet teeth which are formed on circumferential outer surfaces thereof and spur teeth which are formed on circumferential inner surfaces thereof, the ratchet teeth of the first and second ratchet wheels being capable of being engaged by the first and second pawls in directions, respectively, which are opposite to each other, the second ratchet wheel having a sprocket which is secured to one end of the second ratchet wheel in a manner such that the sprocket extends along a circumferential direction.
3. The device as claimed in claim 1, wherein the rotating direction converting section comprises a first rotating plate seated on a bottom surface of the driving drum in a state in which a bearing is intervened between the first rotating plate and the bottom surface of the driving drum, the first rotating plate having a pedal shaft tube which is fitted through a center portion of the first rotating plate in a manner such that it axially projects from one surface of the first rotating plate and two pairs of idle gear shafts which are fastened to the one surface of the first rotating plate around the pedal shaft tube in a manner such that they axially project from the one surface of the first rotating plate, each pair of idle gear shafts having first and second idle gears which are respectively fitted therearound, and a second rotating plate for covering the first rotating plate in a manner such that distal ends of the pedal shaft tube and the two pairs of idle gear shafts are fastened to the second rotating plate.
4. The device as claimed in claim 2, wherein the first and second pawls of the pawl shaft comprise forward and backward rotating pawls, respectively, which are coupled to the pawl shaft at a distance from each other in a manner such that they extend in directions, respectively, which are opposite to each other.
5. The device as claimed in claim 2, wherein the first and second ratchet wheels are close to each other, with a bearing intervened therebetween, in a manner such that they can be seesaw moved, ratchet teeth circles of the first and second ratchet wheels have the same diameter, the ratchet teeth of the first and second ratchet wheels are formed in a manner such that they can be engaged by the first and second pawls in directions, respectively, which are opposite to each other, and spur teeth circles of the first and second ratchet wheels have different diameters.
6. The device as claimed in claim 3, wherein the first idle gear has a diameter which is greater than that of the second idle gear and a length which is a half of that of the second idle gear, the first idle gear is fitted around one of each pair of idle gear shafts along with a spacer ring, and the second idle gear is independently fitted around the other of each pair of idle gear shafts, the first idle gear and the second idle gear being meshed with each other.
7. The device as claimed in claims 2 or 3, wherein the first idle gear is meshed with the spur teeth which are formed on the circumferential inner surface of the second ratchet wheel, and the second idle gear is meshed with the spur teeth which are formed on the circumferential inner surface of the first ratchet wheel.
PCT/KR2000/000241 1999-04-08 2000-03-21 Device for driving bicycle by both forward and backward rotation of pedal WO2000061429A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU34610/00A AU3461000A (en) 1999-04-08 2000-03-21 Device for driving bicycle by both forward and backward rotation of pedal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR2019990017356U KR200167316Y1 (en) 1999-04-08 1999-04-08 A bicycle back pedaling advance system.
KR1999/17356U 1999-04-08

Publications (1)

Publication Number Publication Date
WO2000061429A1 true WO2000061429A1 (en) 2000-10-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2000/000241 WO2000061429A1 (en) 1999-04-08 2000-03-21 Device for driving bicycle by both forward and backward rotation of pedal

Country Status (2)

Country Link
AU (1) AU3461000A (en)
WO (1) WO2000061429A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997021587A1 (en) * 1995-12-08 1997-06-19 World Industry Co., Ltd. Apparatus for changing power direction for bicycle
WO1998056648A1 (en) * 1997-06-09 1998-12-17 World Industry Co., Ltd. Apparatus for changing rotation of pedal shaft for bicycle

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997021587A1 (en) * 1995-12-08 1997-06-19 World Industry Co., Ltd. Apparatus for changing power direction for bicycle
WO1998056648A1 (en) * 1997-06-09 1998-12-17 World Industry Co., Ltd. Apparatus for changing rotation of pedal shaft for bicycle

Also Published As

Publication number Publication date
AU3461000A (en) 2000-11-14

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