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:
Jan. 12, 1982
Filed:
Apr. 01, 1980
Rowan H Colley, Sunnyhill, GB;
Rolls-Royce Limited, London, GB;
Abstract
A constant speed drive comprises a frictional variable speed drive controlled by a control system to produce a constant output speed. The drive includes a rotatable disc having a frusto-conical surface and being urged into frictional engagement with a rotatable annulus having a corresponding frustoconical edge, the annulus and disc being relatively movable between a position in which they are coaxial and provide a unity drive ratio and a position in which they are eccentric and provide a different drive ratio determined by the relative positions of their axes. Actuation means are provided for adjusting the positions of the axes of the annulus and disc relative to one another, and the control system controls the actuation means to vary the relative positions of the axes of the disc and annulus and thus the drive ratio to maintain a sensibly constant output speed.