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:
Apr. 25, 1978
Filed:
Oct. 15, 1976
Applicant:
Inventor:
Melvin A Lace, Prospect Heights, IL (US);
Assignee:
Synchro-Start Products, Inc., Skokie, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
361239 ; 361241 ;
Abstract
A speed-switch control comprising a multi-pole sub-fractional permanent magnet A.C. generator driven by a shaft; the generator develops an initial A.C. signal having an amplitude representative of the shaft speed, and that signal is applied to a threshold circuit where it is rectified and compared with a threshold amplitude correlated with a critical shaft speed range to generate a D.C. switch actuation signal. The D.C. switch actuation signal actuates a solid-state switching circuit to switch a controlled load, such as a safety interlock or alarm, into and out of an external operating circuit.