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
1988-07-11
1989-04-11
Bui, Thuy M.
Endless belt power transmission systems or components
Pulley with expansible rim means or pulleys with alternately...
Structure for variably adjusting radius of rim section
F16H 5554
Patent
active
048202444
ABSTRACT:
The described invention includes a rotatably mounted drive mechanism which is provided with a plurality of radially oriented tracks. The drive mechanism preferably comprises a pair of opposed drive disks with colinear radial tracks having tooth-like formations arranged therein. A movable sheave segment is mounted in each track. Each sheave segment is engaged by an endless belt when the drive mechanism traverses through a predetermined arc of rotation but is disengaged from the drive belt when outside the predetermined arc of rotation. Toothed engagement blocks are associated with each sheave segment to provide a engagement blocks for locking the sheave segment into place in the track. A wedge cam is associatd with each sheave segment and is forced by belt pressure to rigidly bias the sheave segemnts' toothed engagement blocks against the tooth-like formations in the track. Spring(s) are also provided to resiliently bias the toothed engagement blocks into engagement with the track so that the sheave segments are lightly held in place even when out of engagement with the drive belt.
REFERENCES:
patent: 3150529 (1964-09-01), Walk
patent: 3757594 (1973-09-01), Kumm
patent: 3938403 (1976-02-01), Donaldon
patent: 4024772 (1977-05-01), Kumm
patent: 4295836 (1981-10-01), Kumm
patent: 4591351 (1986-05-01), Kumm
patent: 4714452 (1987-12-01), Kumm et al.
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