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. 10, 1986
Filed:
Aug. 27, 1984
Applicant:
Inventor:
Tomoichiro Yamamoto, Inazawa, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B66B / ;
U.S. Cl.
CPC ...
187 / ;
Abstract
An apparatus for controlling a hydraulic elevator in which a bias pattern signal for operating an electric motor at such a low speed that the cage will not move is superposed on a running pattern signal for running the cage, and the electric motor is controlled by the thus superposed pattern signals. Therefore, the amount of oil flowing into or out of the cylinder increases nearly in synchronism with the start of the running pattern, and the cage moves smoothly without generating vibrations.