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:
Nov. 17, 1981
Filed:
Dec. 27, 1979
Michael W Hmelovsky, Warehouse Point, CT (US);
Otis Elevator Company, Hartford, CT (US);
Abstract
An elevator system includes a microprocessor-based cab controller which controls door motion and which controls the generation of stall forces in the door. The disclosed embodiment includes a dictated velocity, high-speed door profile, and a position-controlled dictated velocity profile, door motion being controlled as the difference between actual door velocity and dictated velocity. A stall mode, in which the door motor is provided with currents required to provide a desired force on the door, is invoked with the door velocity is less than a predetermined stall velocity, provided that the door is at an extreme position of traverse, the previous cycle was a stall cycle, or a hysteresis time period has elapsed with the velocity consistently less than the stall velocity. An exemplary elevator control system and microprocessor-based cab controller, as well as an exemplary overall door control program and details of the present invention are disclosed.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile