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:
Sep. 18, 1979
Filed:
Oct. 04, 1977
Melvin A Lace, Prospect Heights, IL (US);
Synchro-Start Products, Inc., Skokie, IL (US);
Abstract
A speed switch control comprising a subfractional permanent magnet AC generator generating an AC signal varying in amplitude with saft speed variations; the AC signal is rectified and compared with a regulated DC reference to generate first and second threshold signals indicative of shaft speeds over and under a critical value. A switch actuator circuit develops 'on' and 'off' switch actuator signals, from the threshold signals to actuate a two-terminal solid state switch between on and off conditions; the 'off' signal is continuous but the 'on' signal is a high-duty-cycle semi-continuous signal including brief recurring 'off' intervals. A power storage/supply circuit, connected in parallel with the switch terminals, which recharges during switch 'off' intervals, affords the power supply for the threshold and switch actuator circuits.