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:
Dec. 30, 1980
Filed:
Oct. 12, 1978
Applicant:
Inventor:
Joseph D Doll, Gering, NE (US);
Assignee:
Lockwood Corporation, Gering, NE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
361 42 ; 239177 ; 361104 ;
Abstract
A safety device and method for detecting over-power conditions on the chassis of a motor driven system interrupts energization of the system when the voltage differential between the system chassis and earth ground exceeds a selected value. The device is especially beneficial for systems utilizing multi-phase induction motors in which current sensing safety devices cannot effectively detect all over-power conditions. The safety device utilizes a fuse and a motor control relay such that, upon the occurrence of the over-power condition, the fuse is rendered non-conductive, opening the motor control relay.