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AssigneeOtis Elevator Company
InventorsClement A. Skalski, John K. Salmon, Boris G. Traktovenko, Richard L. Hollowell
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A method and apparatus for actively counteracting a disturbing force acting on a platform moving vertically in a hoistway is disclosed. A manifestation of the disturbing force such as rotational acceleration or translational accelerations indicative thereof is sensed and counteracted, for example, by effectively adding mass to the platform in proportion to the sensed acceleration. The rotations of the platform may be about a vertical axis, one or more horizontal axes or equivalents thereof. Counteraction may but need not be accomplished using an electromagnet actuator for actuating the platform in response to a control signal from a control means which is in turn responsive to the sensed signal. Whatever type of actuator is used, it may be used as well to bring the platform to rest with respect to a hoistway sill prior to transferring passengers. The control means may be analog or digital or a combination of both. A preferred analog-digital approach is disclosed in which the digital part is responsive to accelerometer signals, the analog part is responsive to a force command signal from the digital part and provides a position feedback signal in return. In a preferred embodiment, four electromagnet actuators are situated near the bottom of the platform. Each actuator may act along a line which intersects the walls of the car at a forty-five degree angle. A single axis embodiment is also disclosed.
A method for reducing acceleration of an elevator car, comprising the steps of:
A method for reducing accelerations of an elevator car, comprising the steps of sensing horizontal accelerations of the car's top and bottom and providing sensed top and bottom acceleration signals having magnitudes indicative thereof and effectively adding mass to the top and bottom of the car in proportion, respectively, to the magnitude of the sensed top and bottom acceleration signals.
Apparatus for reducing accelerations of an elevator car comprising:
Apparatus for stabilizing an elevator car, comprising:
A method for stabilizing an elevator car, comprising the steps of:
A method for stabilizing an elevator platform in a hoistway, for stopping at hoistway doors and transferring passengers across a threshold comprising a hoistway sill and a platform sill, comprising the steps of:
Apparatus, for stabilizing an elevator platform for moving up and down a hoistway, stopping at hoistway doors and transferring passengers across a threshold comprising a hoistway sill and a platform sill, comprising:
Dependencies are inferred from the claim text.