Time controlled elevator door motion
Patent 4342379 Issued on August 3, 1982. Estimated Expiration Date: 
December 27, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 27, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3376486 3627080 3673482 3729668 InventorsAssigneeApplicationNo. 06/107695 filed on 12/27/1979US Classes:187/316, With specific electrical control therefor318/561, Adaptive or optimizing systems including "bang-bang" servos318/617Variable rate feedbackExaminersPrimary: Truhe, J. V.Assistant: Duncanson, W. E. Jr. Attorney, Agent or FirmInternational ClassesG05D 3/12 (20060101)E05F 15/14 (20060101) AbstractAn elevator system has a microprocessor-based cab controller mounted directly on the elevator car, the elevator door mechanism is connected to a transducer which provides signals as a function of the position of the door mechanism, and the cab controller controls the door motion in a closed loop manner by providing door command signals to the elevator door mechanism in dependence upon the deviation of the present door velocity from a current value of a dictated velocity in accordance with a desired door traverse velocity profile which includes desired increasing and decreasing rates of acceleration and deceleration, and desired maximum velocity, acceleration and deceleration. The disclosure includes a typical elevator system, an exemplary cab controller, and an exemplary door control program flowchart as an environment for the present invention, in addition to details concerning the invention. | |
