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. 02, 1977
Filed:
Jun. 30, 1976
Joseph Guarracini, Lawrenceville, NJ (US);
RCA Corporation, New York, NY (US);
Abstract
A turntable has a central opening in which a centering spindle is snugly received for a reciprocal motion along the axis of rotation of the turntable. The centering spindle has a tapering end for engagement with walls defining a central aperture of a disc master in order to center the disc master relative to the turntable. A spring, located in the turntable central opening, biases the centering spindle in a direction such that the tapering end of the centering spindle, in engagement with the walls defining the central aperture of the disc master, urges the disc master against engaging ends of locating members, secured to the peripheral portion of the turntable, to locate a surface of the disc master in a recording plane defined by the engaging ends of the locating members. The locating members selectively occupy positions permitting installation and removal of the disc master.