Endless belt power transmission systems or components – Pulley with expansible rim means or pulleys with alternately... – Structure for variably adjusting radius of rim section
Patent
1996-09-13
1998-06-30
Schoeppel, Roger J.
Endless belt power transmission systems or components
Pulley with expansible rim means or pulleys with alternately...
Structure for variably adjusting radius of rim section
474 53, F16H 6100
Patent
active
057725462
ABSTRACT:
A continuously variable automatic drive has a front driving sprocket and a rear driven sprocket. Each of these sprockets has a housing and a plurality of involute-shaped toothed segments, each having a leading end and a trailing free end. The toothed segments are symmetrically spaced around their housings and pivotally attached to their housings about their leading ends. Each toothed segment is movable between a first position where the trailing free end is pivoted inwardly closest to the housing and the effective diameter of the sprocket is smallest and a second position where the trailing free end is pivoted outwardly farthest from the housing and the effective diameter of the sprocket is largest. The highest gear ratio is produced when the front driving sprocket is at the second position and the rear driven sprocket at the first position. The lowest gear ratio is produced when the front driving sprocket is at the first position and the rear driven sprocket is at the second position. The springs are biased so that the gearing defaults to the highest gear ratio, at the relaxed, neutral position, where no force is applied to the driving sprocket.
REFERENCES:
patent: 1144381 (1915-06-01), Reimers
patent: 3935751 (1976-02-01), Lee
patent: 4373926 (1983-02-01), Fullerton
patent: 4642070 (1987-02-01), Walker
patent: 5054801 (1991-10-01), Reimers
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