Land vehicles – Wheeled – Occupant propelled type
Patent
1991-06-06
1992-04-07
Hill, Mitchell J.
Land vehicles
Wheeled
Occupant propelled type
280259, 280261, 475144, B62M 900
Patent
active
051021552
ABSTRACT:
A bicycle includes a speed-increasing mechanism interposed between the driving sprocket and the driven sprocket. The speed-increasing mechanism includes a small intermediate sprocket mounted rotatably on the frame of the bicycle, a first chain trained on the driving sprocket and the small intermediate sprocket, a large intermediate sprocket connected securely and coaxially to the small intermediate sprocket, and a second chain trained on the large intermediate sprocket and the driven sprocket. The radius of the small intermediate sprocket is smaller than that of the driving sprocket, while the radius of the large intermediate sprocket is greater than that of the driven sprocket. In one embodiment, the frame includes a generally U-shaped bracket having two symmetrical, parallel, upright side walls each of which has a notch cut formed in the upper end thereof, a shaft positioned between the side walls of the bracket, two threaded holes respectively formed in two end surfaces thereof, and two lock bolts respectively extending through the notches cut of the bracket to engage with the threaded holes of the shaft so as to retain the shaft on the bracket. The large and small intermediate sprockets on same hub are journalled on the shaft.
REFERENCES:
patent: 1205382 (1916-11-01), Parda
patent: 1360032 (1920-12-01), Schiffner
patent: 1380082 (1921-05-01), Schleder
patent: 1535714 (1925-04-01), Burke
patent: 2815222 (1957-12-01), Harrison
patent: 3466059 (1969-09-01), Kiernan
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