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:
Jul. 26, 1988
Filed:
Feb. 02, 1987
Applicant:
Inventor:
Ralph J Hurley, Mogadore, OH (US);
Assignee:
Loral Corporation, New York, NY (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01H / ; H01H / ; F16K / ;
U.S. Cl.
CPC ...
361210 ; 361167 ; 25112909 ; 25112910 ;
Abstract
Fail-safe brake valve driver (10) is provided for controlling a dual coil (A,B) brake valve. A pair of identical circuits (12, 14) are each uniquely associated with one of the brake valve coils. By means of control of an operational amplifier (16) and dual-stage current driver (18), the circuits (12, 14) each provide one-half of the current necessary for achieving brake valve control under normal operations. In the event that one of the coils (A, B) or circuits (12,14) fails, relays (56, 156) are provided for removing the failed circuit or coil from operation and allowing the remaining coil and circuit to carry the full operational load.