Elevator – industrial lift truck – or stationary lift for vehicle – With barrier for regulating access to load support – Includes motor or motor driven linkage for shifting barrier
Patent
1993-03-10
1994-12-13
Stephan, Steven L.
Elevator, industrial lift truck, or stationary lift for vehicle
With barrier for regulating access to load support
Includes motor or motor driven linkage for shifting barrier
49120, B66B 1314
Patent
active
053731204
ABSTRACT:
A linear motor is used to actuate an elevator door in response to a control signal for counteracting rotational torque caused by a variable-length moment arm about the center of gravity of the door by varying the magnitude of a linear force exerted on the door acting through a fixed-length moment arm about the center of gravity of the door for providing an opposing rotational torque, thereby counteracting the rotational torque caused by the normal force. The first and second rotational torques may be controlled to decrease and increase linearly as the door goes through its motion. In this way, the velocity profile varies in a curve similar to one side of the major axis of an ellipse. The normal force may be provided so as to levitate the door to reduce gravitational forces acting on door rollers. The control may be carried out in an open- or closed-loop fashion.
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"Linear direct drives featuring three-phase asynchronous motors", a brochure from Automation & Servo Technologies, Inc., a U.S. representative of Krauss Maffei AG.
Barrett David W.
Bialy Louis
Gagnon Ernest P.
Peruggi Richard E.
Nappi Robert
Otis Elevator Company
Stephan Steven L.
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