Land vehicles – Wheeled – Occupant propelled type
Patent
1984-12-04
1986-09-23
Pekar, John A.
Land vehicles
Wheeled
Occupant propelled type
192 6R, 362192, B62M 106
Patent
active
046130101
DESCRIPTION:
BRIEF SUMMARY
The present invention generally relates to an improved power transmission system, and more particularly the invention relates to a mechanical, electric power supply and transmission system for a bicycle of a type having a frame with a crank housing for a crank- and -pedal means and from said crank housing a projecting bottom fork carrying the drive wheel over a drive hub at the outer end thereof and having a mechanical power transmission means between said crank housing and drive hub.
Previously known power transmission systems for a bicycle made use of chains, which from a chain wheel at the crank means drives a chain sprocket which is directly connected to the drive wheel hub. Driving by means of chains involves problems in that the chain is subjected to wear whereby it grows longer and the chain wheel teeth, especially the chain sprocket teeth at the wheel hub, are worn so that said teeth no longer fit exactly to the chain. When using chain drives there is always a risk that the chain runs off the chain wheel or sprocket and either makes it impossible to brake the bicycle or tangels itself so that the bicycle is abruptly braked. There is also a risk that the chain will break. In open chain drive systems there is also a risk that parts of the cloths of the bicycle rider get caught between the chain and the chain wheel teeth.
In known drive systems for a bicycle having exchange gears substantial problems also may appear. The exchange gears may be of the several sprocket type in which an elongated and spring loaded chain is used in which the chain may be moved between different large sprockets alternatively the gear may be of the hub type, whereby the gear is housed in the wheel hub. As mentioned above a gear of the chain sprocket type needs an elongated and spring loaded chain which easily may jump off the sprocket or the chain wheel, while changing gears by moving the chain from one sprocket to the next sprocket both the chain and the sprocket may be damaged.
In gears of the hub type the exchange cog wheels must for practical reasons be made rather weak in order to be housed in the hub, and weak cog wheels may easily be damaged, especially in case of careless handling or changing of gears.
In order to overcome the above mentioned problems, U.S. Pat. No. 3,861,715 proposes the power transmission as a solid shaft extending between the crank-and-pedal means and the the drive wheel hub and the drive wheel hub as a free wheel mechanism. A drive connection is provided when the crank is moved forwardly and the hub idles when the crank is not moved. For braking it is necessary to make use of separate brakes of previously known types, for instance a separate brake engaging the wheel rim. Such brakes are apt to frequent failure and are not considered traffic safe.
Most previously known bicycles have a separate electric system including a dynamo which is releasably mounted at the front wheel fork or at the seat stays or the bottom forks at the rear wheel. Irespective of the location of the said separate dynamo such dynamos have a rather low effect, they generally are rather power. In case of rain and especially snow the power intake, which is in contact with the bicycle tire skides, the dynamo is subjected to dampness and moisture and above all there is a risk that the dynamo becomes loose from the cycle frame and comes into contact with the wheel spokes as may cause serious accidents.
The object of the invention therefore is to solve the problem of providing an improved power transmission system for a bicycle in which the above mentioned problem involved in chains and chain sprockets have been eliminated, which drive system can be made as closed unit and with gears made strong and solid, and in which the electric power supply and transmission system is directly connected to the mechanical power transmission system, preferably so that the mechanical and electric power supply and transmission systems are made as an integral unit.
According to the invention the mechanical power transmission means comprises a drive sh
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