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7156210 |
Freight elevator landing door control
A control system for a motorized freight elevator landing door in which all of the doors in a single line of a hoistway are controlled with one set of proximity sensors carried on the elevator car....
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6285961 |
Procedure for determining the parameters for an electric drive controlling a synchronous elevator motor with permanent magnets
A procedure determines the parameters for an electric drive that controls a synchronous elevator motor having permanent magnets, a computer controlling the operation of the electric drive being...
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5878846 |
Light duty elevator door operator
An elevator car door operator includes a drive motor, a drive pulley mounted for rotation by the drive motor, a continuous loop drive belt mounted on the drive pulley at one end of the belt and on...
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5797471 |
Linear door drive operator
An elevator system has a car provided with a doorway and a door movable across the doorway. An improved mechanism to move the door selectively to open and closed positions includes a header mounted...
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5317934 |
Variable speed linear actuator
An apparatus that converts a rotary motion into linear motion through the use of a linkage system that has a pair of levers that are driven through a pulley arrangement. Wherein, the pair of levers...
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4896747 |
Modular elevator system
A modular elevator system is disclosed incorporating a wiring and control module which is attached to the elevator car. One of the modules includes a floor selection device and display panel...
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4735293 |
Hatchway door for elevator system
A hatchway door for an elevator system which includes a smoke seal. The smoke seal includes a compression seal along the trailing edge of each door panel which engages as the panel reaches the...
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3036660 |
Drive-in service machine
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2960188 |
Elevator door control mechanism
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