Multiple speed bicycle having single drive sprocket

Details Multiple speed bicycle having single drive sprocket Multiple speed bicycle having single drive sprocket

1998-06-11

1999-10-19

Wright, Dirk

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural drive ratios other than unity

475287, 475289, F16H 344

Patent

active

059679387

ABSTRACT:
A multiple speed bicycle of the coaster brake type has a single drive sprocket and a drive chain in longitudinal alignment with one another. A sun gear is keyed to the main drive axle of the bicycle and rotates with the main drive axle. The sun gear engages a drive gear mounted on a planet gear axle and a planet gear is mounted on the same planet gear axle. Driving and driven satellite gears are mounted on satellite gear axles that are pivotally mounted on a nonrotatable ring concentric with the main drive axle. The satellite gears have differing diameters and differing numbers of teeth, one for each GEAR of the bicycle, and are positioned radially outwardly of the planet gear, in circumferentially spaced relation to one another. The planet gear orbits the main drive axle in incremental degrees of angular rotation when the bicycle operator manipulates a remote control member on the handlebar of the bicycle to change from one preselected gear to another preselected gear. Each gear change causes the planet gear to engage a different driving satellite gear and drive its companion driven satellite gear into meshing engagement with a rotatably mounted ring gear that is connected to the drive sprocket. A clutch and gear selector assembly for enabling the gear changing is controlled by a control cable that extends downwardly from the remote control member.

REFERENCES:
patent: 4973297 (1990-11-01), Bergles
patent: 5078664 (1992-01-01), Nagano
patent: 5273500 (1993-12-01), Nagano
patent: 5562563 (1996-10-01), Shoge
patent: 5676022 (1997-10-01), Ose
patent: 5785625 (1998-07-01), Matsuo et al.
patent: 5845727 (1998-12-01), Miyazawa et al.
patent: 5855530 (1999-01-01), Huang et al.
patent: 5863270 (1999-01-01), Chen et al.

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