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:
May. 27, 1980
Filed:
Jul. 13, 1978
Robert C Franklin, Los Gatos, CA (US);
Beckman Instruments, Inc., Fullerton, CA (US);
Abstract
A method and apparatus for detecting the absence of a coded overspeed disk used to indicate the maximum design speed of a rotor which is rotatably connected to a high speed centrifuge. Two donut-shaped coded disks, one mounted on the drive shaft on the centrifuge and the other mounted on the centrifuge rotor are utilized. Optical emitter sensor assemblies are used to produce speed control and overspeed signals. By sensing the light reflected back to the optical sensor from the drive system hub, the rotational speed of the centrifuge is indicated. By sensing the light reflected back to the optical sensor from the overspeed disk mounted on the rotor, the rotation of the rotor is detected. In the absence of an overspeed disk, the speed control frequency will exceed that of the overspeed disk.