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
1980-03-24
1982-08-03
Braun, Leslie
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 47, 474 49, 474 53, F16H 5530
Patent
active
043425593
ABSTRACT:
A load-responsive variable diameter pulley in a drive system using a driving pulley and a driven pulley functionally connected by a belt. The basic pulley assembly includes two spaced apart parallel sideplates concentric to a hub. One plate is fixed to the hub while the other is movable angularly about the pulley axis relative to the fixed plate. Slots are provided in the surfaces of both plates and a plurality of arcuate belt-engaging segments located between the plates are provided with laterally extending pins that are received in the slots. In the basic pulley a spring normally urges the movable plate to bias it and belt-engaging segments to the position defining maximum pulley diameter. The slots in the fixed plates are in pairs and the individual slots are not parallel to each other. The slots are designed so that the chord of the effective arc of the arcuate segment guided in the slots is always perpendicular to a radius of the pulley. Pattern and/or speed of response may be adjusted by change in configuration of the slots. In one drive system wherein the basic pulley is combined with a smaller pulley as in a bicycle drive, no spring is provided in the small pulley so it will normally be at minimum diameter, but such diameter will increase automatically with any decrease in diameter of the basic pulley.
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Braun Leslie
Finch Robert R.
National Technology Corporation
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