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:
Jun. 16, 1987
Filed:
Oct. 09, 1985
Applicant:
Inventor:
Toshiaki Ishii, Ichinomiya, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B66B / ;
U.S. Cl.
CPC ...
187134 ;
Abstract
A position control system for elevators including a plurality of pulse encoders which independently generate pulse signals in accordance with the movement of a cage. The pulse signals are respectively counted, and the operation of the cage is terminated when a difference in counted results between the encoders has exceeded a predetermined value. Thus, the cage can continue to operate even if there is a small difference between the counted results, and, when any of the pulse encoders malfunction, which triggers a substantially larger difference in counted results, the cage is controlled to stop the operation.