Machine element or mechanism – Elements – Cranks and pedals
Patent
1994-12-07
1996-05-14
Bonck, Rodney H.
Machine element or mechanism
Elements
Cranks and pedals
74 68, 745941, G05G 114
Patent
active
055157467
ABSTRACT:
A traveling driving device for a bicycle, which device is capable of increasing rotational torque of a chain wheel using pedaling cranks without elongating a crank arm. This device is borne by a bearing disposed on a frame of the bicycle and has an eccentric plate put on a rotating shaft having cranks with pedal. This eccentric plate is secured to a frame member of the bicycle through a stay portion. The chain wheel is put rotatably on the outer periphery of the eccentric plate through a ball bearing and a working plate secured to the rotating shaft is linked to the chain wheel by linking members. When the rotating shaft is rotated by pedaling action of the cranks, rotation is transmitted to the chain wheel through the working plate and the linking members. Since the chain wheel is rotated in an eccentric state with respect to the rotating shaft, it can be rotated with a rotation radius smaller than a chain wheel having no eccentric mechanism and as a result, rotational torque of the chain wheel is increased, depending on eccentricity length.
REFERENCES:
patent: 657859 (1900-09-01), Cottrell
patent: 4164153 (1979-08-01), Moritsch et al.
patent: 4816009 (1989-03-01), Philipp
Bonck Rodney H.
Kim Chong H.
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