The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 03, 1982
Filed:
Mar. 24, 1980
Robert N Williams, Salt Lake City, UT (US);
National Technology Corporation, Salt Lake City, UT (US);
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.