Hydraulic elevator system

Details Hydraulic elevator system Hydraulic elevator system

1989-02-15

1990-06-12

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 104

Patent

active

049325027

ABSTRACT:
A hydraulic elevator system 10 having an elevator car 12 in which car velocity V and car position L are determined by detecting the quantity Q of hydraulic fluid transferred between a hydraulic cylinder and a hydraulic fluid reservoir. The car velocity V is directly proportional to Q and the car position L is directly proportional to the integral of Q. The car velocity V, or quantity Q, is compared with a desired velocity pattern, or desired flow rate pattern, PG, and the difference is a control signal C which is used to control the quantity Q. The car position L may also be used to determine the distance-to-go to a target floor, which may be used to initiate slowdown and/or to calculate all, or selected portions of, the desired pattern PG.

REFERENCES:
patent: 3570243 (1971-03-01), Comer et al.
patent: 3977497 (1976-08-01), McMurray
patent: 4311212 (1982-01-01), Simpson
patent: 4469199 (1984-09-01), Polis et al.
patent: 4470482 (1984-09-01), Husson
patent: 4548296 (1985-10-01), Hasegawa
patent: 4775031 (1988-10-01), Nakamura et al.

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