Elevator – industrial lift truck – or stationary lift for vehicle – Miscellaneous
Reexamination Certificate
2011-03-15
2011-03-15
Brahan, Thomas J. (Department: 3654)
Elevator, industrial lift truck, or stationary lift for vehicle
Miscellaneous
C187S406000
Reexamination Certificate
active
07905332
ABSTRACT:
A method of controlling noise noticeable within an elevator car (22) includes intentionally introducing noise into the elevator car (22) at a noise level that depends on the position of the car within a hoistway (24). A disclosed example includes using existing elevator system components for generating compensating noise at different levels corresponding to different positions of the car within the hoistway. One disclosed example includes increasing introduced noise as the car descends further away from a machine responsible for moving the car. The introduced noise reduces or eliminates changes in noticeable noise within the elevator car as the car moves relative to the machine. The disclosed examples have particular usefulness in machine roomless elevator systems although they are not necessarily limited to such systems.
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Brahan Thomas J.
Carlson & Gaskey & Olds PC
Otis Elevator Company
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