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. 31, 1990
Filed:
Jul. 14, 1988
Applicant:
Inventor:
Shigemi Iwata, Inazawa, JP;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B66B / ;
U.S. Cl.
CPC ...
187105 ; 361 76 ;
Abstract
A safety device for an elevator which has a converter for converting a 3-phase A.C. power source into a D.C. power source, a control circuit for the elevator employing as a power source the D.C. power source outputted from the converter, a level converter for converting the voltage of the D.C. power source outputted from the converter into a logic level, and defective phase detecting means for detecting the defective phase of the 3-phase A.C. power source by dividing the output signal of the level converter in a time division manner.