Elevator – industrial lift truck – or stationary lift for vehicle – Having specific load support drive-means or its control – Includes control for power source of drive-means
Reexamination Certificate
2003-03-28
2004-10-12
Salata, Jonathan (Department: 2837)
Elevator, industrial lift truck, or stationary lift for vehicle
Having specific load support drive-means or its control
Includes control for power source of drive-means
C187S247000
Reexamination Certificate
active
06802395
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a braking system for an elevator and more particularly to the system to control the deceleration of an elevator during an emergency braking condition.
2. Description of the Background Art
Modern elevator systems are among the safest modes of travel and normally provide smooth and comfortable rides for its passengers. Furthermore, computerized control system currently available provide the cars with a gentle landing at the selected floors so as to avoid the uncomfortable feeling of sudden deceleration and jerkiness.
Various devices have been configured to control the motor drive of the elevator so that the movement of the car is smooth and comfortable for the passengers. U.S. Pat. No. 4,570,755 shows a computer which controls the movement of an elevator car during the final several inches of travel approaching a selected floor. Similarly, U.S. Pat. No. 4,220,221 shows a system for controlling the velocity of the vehicle so that it is stopped smoothly while being aligned with a desired floor. Likewise, U.S. Pat. No. 3,743,055 controls the acceleration and deceleration of an elevator car as it moves between floors.
These and other systems provide for gentle landings by controlling the motor when the elevator is in the normal operational mode. However, during an emergency situation, emergency braking systems are utilized to stop the elevator car. These emergencies may be due to a power failure, a broken safety chain or some other sensed
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Afman Don
Helstrom Brad
Weber John
Kone Corporation
Salata Jonathan
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