Speed changing device for a bicycle

Details Speed changing device for a bicycle Speed changing device for a bicycle

1995-07-24

1996-11-19

Marmor, Charles A.

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Brake for planetary transmission having axis of planet...

74417, 280260, 475269, F16H 344

Patent

active

055757316

ABSTRACT:
A speed changing device for a bicycle includes a tubular shell adapted to be mounted on a bicycle frame of the bicycle, a crank axle extending axially and rotatably through the tubular shell and having two end portions that extend respectively out of the tubular shell, and a gear wheel set disposed in the tubular shell. The gear wheel set includes a connecting shaft extending transversely from an intermediate portion of the crank axle, a driving bevel gear mounted rotatably on the connecting shaft, and first and second driven bevel gears mounted rotatably on the crank axle and disposed respectively on two sides of the connecting shaft. The first and second driven bevel gears mesh respectively with the driving bevel gear, and the first driven bevel gear can be locked selectively to the tubular shell. The driving bevel gear is rotatable about an the connecting shaft and about axis of the crank axle to drive rotatably the second driven bevel gear at a higher speed ratio when the crank axle is rotated while the first driven bevel gear is locked to the tubular shell, than when the first driven bevel gear is not locked to the tubular shell.

REFERENCES:
patent: 437827 (1890-10-01), White
patent: 475307 (1901-01-01), Brady
patent: 519933 (1894-05-01), Swedlund
patent: 587787 (1897-08-01), Buckler
patent: 651676 (1900-06-01), Storey

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