Land vehicles – Wheeled – Occupant propelled type
Patent
1998-09-04
2000-11-28
Swann, J. J.
Land vehicles
Wheeled
Occupant propelled type
280259, 745943, B62M 102, G05G 114
Patent
active
061524719
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a bicycle, and more particularly, to a variable pedal driving device of bicycle which can extend, upon running, a distance between crankshafts which transmit a rotating force of pedals to a rear wheel and the pedals to thereby obtain a maximum driving energy, at the expense of a minimum physical energy consumption.
BACKGROUND ART
Generally, an existing bicycle has been designed to have a fixed distance between crankshafts and pedals and therefore, its running force depends only upon a driving force of the pedals assembled with the crankshafts. Under such the driving structure of the bicycle, since the rotating force of the pedals is exerted within a predetermined rotary radius, the bicycle needs lots of driving energy upon running up a climbing road. To improve this problem as well as to obtain an effective driving energy, it is well known that a change gear may be installed to optimize the running force of the bicycle.
However, although the change gear has been mounted, the pedals, which are a power source of the running force of the bicycle, maintains a constant rotary radius to thereby provide the same driving energy amount. It can be therefore appreciated that installation of the change gear fails to provide a desired driving force. Due to such the failure, there occurs a need to vary the restrictive rotary radius of pedals to thereby optimize the running force of the bicycle in order to minimize driving energy consumption.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a variable pedal driving device of a bicycle which can improve a structural feature of crankshafts on which pedals are installed to enlarge a rotary radius of the pedals, upon running, thus to obtain an optimum driving energy and to minimize physical energy consumption, whereby when the bicycle runs up a climbing road or a long distance, it causes minimum fatigue to a user.
To achieve this and other objects according to the present invention, a variable pedal driving device of a bicycle includes: first and second power transmission units installed on both sides of a main shaft mounted on a shaft pipe of a shaft hole of a bicycle frame; first and second slide pipes associated on first and second fixed shafts of first and second rotary levers rotatably mounted on both ends of the shaft pipe; first and second pedals installed on front ends of the first and second slide pipes; and first and second crankshafts mounted on first and second rotary shafts of the power transmission units and slidingly associated on first and second slide holes of the first and second slide pipes, the first and second rotary shafts of the crankshafts and the main shaft being engaged with each other and the second rotary shaft of the second power transmission unit being engaged with a chain sprocket connected by means of a chain with a rear wheel.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
BRIEF DESCRIPTION OF DRAWINGS
The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
FIG. 1 is a side view illustrating a variable pedal driving device constructed according to a first embodiment of the present invention;
FIG. 2 is a perspective view illustrating main parts of FIG. 1;
FIG. 3 is a sectional view of FIG. 1;
FIG. 4 is an exploded perspective view of FIG. 1;
FIGS. 5A to 5C are side views illustrating operational states of FIG. 1;
FIG. 6 is an exploded perspective view illu
REFERENCES:
patent: 597098 (1898-01-01), Bullis
patent: 4446754 (1984-05-01), Chattin
patent: 4519271 (1985-05-01), Chattin
patent: 4807491 (1989-02-01), Stuckenbrok
patent: 4960013 (1990-10-01), Sander
patent: 5095772 (1992-03-01), Fortson
patent: 5172926 (1992-12-01), Mannino
patent: 5207119 (1993-05-01), Garneau
patent: 5261294 (1993-11-01), Ticer et al.
Kang Byung Nam
Kim Jong suk
Park Hye Jong
Swann J. J.
Zeender F.
LandOfFree
Variable pedal driving device of bicycle does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Variable pedal driving device of bicycle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable pedal driving device of bicycle will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1717063