Procedure and apparatus for controlling a hydraulic elevator dur

Details Procedure and apparatus for controlling a hydraulic elevator dur Procedure and apparatus for controlling a hydraulic elevator dur

1991-06-04

1992-03-31

Pellinen, A. D.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 904

Patent

active

050999575

ABSTRACT:
A procedure and apparatus for controlling a hydraulic elevator during approach to a landing are disclosed, in which the speed of the elevator and the temperature of the hydraulic fluid are measured prior to beginning deceleration of the elevator. The deceleration point is adjusted on the basis of the speed and temperature information. The elevator passes a deceleration flag while approaching a landing, which is used to measure the speed of the elevator, and to provide a reference point from which the location of the deceleration point is determined. At temperatures exceeding a given reference temperature, the normal deceleration point is shifted from the leading edge of the deceleration flag to its trailing edge, and the start of actual deceleration of the elevator is delayed in relation to the deceleration point (trailing edge of the deceleration flag) by an amount depending on the elevator speed and oil temperature. At temperatures below the given reference temperature, deceleration begins at the leading edge of the deceleration flag without delay.

REFERENCES:
patent: Re33171 (1990-02-01), Ogasawara et al.
patent: 4311212 (1982-01-01), Simpson
patent: 4637495 (1987-01-01), Blain
patent: 4715478 (1987-12-01), Nakamura et al.
patent: 4991693 (1991-02-01), Stern et al.
patent: 5040639 (1991-08-01), Watanabe et al.

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