Method and appartus for the measurement of the load in an elevat

Details Method and appartus for the measurement of the load in an elevat Method and appartus for the measurement of the load in an elevat

1996-07-18

1998-12-22

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

187281, 187392, B66B 104

Patent

active

058522646

ABSTRACT:
A method and apparatus for measuring a load in an elevator cage supported by a carrying frame. The elevator cage movable relative to the carrying frame and to an elevator shaft. The elevator cage may rest on spring elements, which bear on the carrying frame. A belt, which may guided by a pair of deflecting rollers, may be mechanically coupled with the elevator cage. The movement of the elevator cage may be transmitted to the belt, which drives a pulse generator coupled to a first deflecting roller. When the load within the elevator cage changes, the spring elements may be compressed to a greater or lesser extent according to their spring characteristic. Accordingly, the elevator cage may move relative to the carrying frame, and the movement may be detected by the pulse generator and translated into a travel signal. An evaluating unit may be utilized to convert the travel signal into a load magnitude for influencing a motor current.

REFERENCES:
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patent: 4573542 (1986-03-01), Schlegal et al.
patent: 4793442 (1988-12-01), Heckler et al.
patent: 5149922 (1992-09-01), Kondou
patent: 5306879 (1994-04-01), Pearson
patent: 5435416 (1995-07-01), Siikonen et al.
patent: 5531294 (1996-07-01), Burton et al.
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