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
Patent
1996-05-08
1998-02-10
Nappi, Robert
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
188 1112, 187292, B66B 132, B66B 134
Patent
active
057171742
ABSTRACT:
An apparatus and a method for controlling an elevator brake assembly (1) includes a control circuit (CM) for selectively connecting an electrical power supply (28) to a brake armature coil (9) to move an armature plate (4) between a brake actuated rest position against a brake friction lining (5) and a brake released hold position adjacent a brake housing (2). The control circuit (CM) applies a first voltage to the coil (9) to move the armature plate (4) against a force applied by a spring (3) from the rest position to the hold position in response to a signal on a brake pick signal line (BP). The control circuit (CM) applies a second voltage to the coil (9) to control the movement of the armature plate (4) by the spring (3) from the hold position to the rest position in accordance with a predetermined velocity versus distance curve to achieve minimum impact on the lining (5) at the rest position. A position sensor (11,12) is moved by the armature plate (4) to generate an actual position signal for adjusting the second voltage and a microswitch (10) is actuated by the armature plate (4) to signal the hold position. The control circuit (CM) self-calibrates by minimizing the position signal at the rest position and adjusting the velocity versus distance curve based upon the position signal at the hold position.
REFERENCES:
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patent: 5153389 (1992-10-01), Nomura
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patent: 5255760 (1993-10-01), Lamb et al.
patent: 5402863 (1995-04-01), Okumura et al.
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Patent Abstracts of Japnan; No. 07002441; Mizuno Kimimoto, Ishi Toshiaki, Jan. 6, 1995.
Clemens William J.
Inventio AG
Nappi Robert
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