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:
Jan. 18, 1983
Filed:
Dec. 15, 1980
Glen A Rued, Montrose, CA (US);
Elevator Equipment Company, Los Angeles, CA (US);
Abstract
A control unit for a hydraulic actuated elevator consists of a valve device in the hydraulic circuit wherein the circuit includes a pump, a hydraulic cylinder and its piston for raising and lowering an elevator cab and a reservoir for the hydraulic fluid. The valve device features a rotary disc serving as a valve element slidable to positions which open and close ports leading respectively to the reservoir and the cylinder. A reversible electric motor in a cab demand circuit has a rotary drive to the rotary disc, as, for example, by a pinion and gear, for rotating the rotary disc in response to the cab demand circuit serving to start and stop the motor. In one position of the rotary disc, with both ports closed, hydraulic fluid is passed directly into the cylinder for up travel of the cab. In an intermediate position with the port to the cylinder closed the fluid is locked in the cylinder in stop position of the cab. In a third position with both ports open fluid flows from the cylinder to the reservoir, bypassing the pump, for down travel of the cab.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile