Apparatus to automatically adjust spring tension of an elevator

Details Apparatus to automatically adjust spring tension of an elevator Apparatus to automatically adjust spring tension of an elevator

1993-11-05

1995-04-04

Stephan, Steven L.

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

187351, B66B 132

Patent

active

054028639

ABSTRACT:
An elevator adjusting apparatus for adjusting a brake torque produced by a brake for braking travel of an elevator cage includes a brake torque adjustment mode setting unit for setting an adjustment mode for the brake torque, a cage position recognizing unit for recognizing a cage position, a cage speed detecting unit for detecting a cage speed, a brake actuation command generating unit for reissuing a brake actuation command generating unit for issuing a brake actuation command when the brake torque adjustment mode is set by the brake torque adjustment mode setting unit and the cage position recognizing unit recognizes that the cage position has reached a predetermined position of a lift passage, a brake control unit for actuating the brake in response to the brake actuation command issued from the brake actuation command generating unit, and a brake torque calculating unit for calculating the brake torque based on the cage speed detected by the cage speed detecting unit during the brake actuation. With the apparatus, the brake torque can be adjusted simply accurately and efficiently without using any weights.

REFERENCES:
patent: 3613835 (1971-10-01), Vizzotto
patent: 4518062 (1985-05-01), Makinen et al.
patent: 4984659 (1991-01-01), Nomura
patent: 4987977 (1991-01-01), Nomura
patent: 5244060 (1993-09-01), Tanaka et al.

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