Machine element or mechanism – Elements – Cranks and pedals
Patent
1995-09-12
1997-07-08
Luong, Vinh T.
Machine element or mechanism
Elements
Cranks and pedals
745941, G05G 114
Patent
active
056449534
ABSTRACT:
A crank assembly for a bicycle includes a drive plate and an elongated crank arm which are separately formed. The bicycle includes a sprocket with a fixed rotating shaft of a rectangular cross-section. The drive plate has an internal peripheral wall that defines a shaft hole, an inward flange that projects from the inner peripheral wall into the shaft hole in such a manner that the shaft extends through the shaft hole, and several angularly equidistant through-holes around the shaft hole. The crank arm has an end portion with a fastener hole, an annular flange portion which projects horizontally from the end portion and which has a vertical abutting face that abuts on the inward flange of the drive plate, and a rectangular receiving space formed through the flange portion to form a portion of the fastener hole and to receive the shaft. The fastener hole has an outer section with a shape different from that of the rectangular receiving space. The annular flange portion of the crank arm is fitted within the shaft hole. Several locking bolts extend through the through-holes of the drive plate to engage threadably within the threaded holes of the crank arm, so as to fasten together the drive plate and the crank arm.
REFERENCES:
patent: 4201120 (1980-05-01), Segawa
patent: 4630503 (1986-12-01), Liu
patent: 4704919 (1987-11-01), Durham
patent: 5062318 (1991-11-01), Yamazaki
patent: 5179873 (1993-01-01), Girvin
patent: 5197353 (1993-03-01), Trenerry et al.
patent: 5242028 (1993-09-01), Murphy et al.
patent: 5435869 (1995-07-01), Christensen
Cyclone Precision Inc.
Luong Vinh T.
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