Method and apparatus for saving electrical energy in an hydrauli

Details Method and apparatus for saving electrical energy in an hydrauli Method and apparatus for saving electrical energy in an hydrauli

1993-03-04

1994-12-13

Stephan, Steven L.

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific load support drive-means or its control

Includes fluid supporting ram in drive-means

187286, B66B 904

Patent

active

053731212

ABSTRACT:
A drive system for an hydraulic elevator operated at a constant output power for any load during elevator car travel in the upward direction. The maximum nominal speed in the upward direction is selected for a load which typically occurs most frequently and the drive is designed accordingly. The car speed is reduced correspondingly for higher loads and increased correspondingly for lower loads. The variable car speed is achieved either through the use of an adjustable pump of variable displacement volume controlled by a pressure regulating valve or through the use of a positive displacement pump of constant displacement volume which is driven by a frequency regulated electrical motor.

REFERENCES:
patent: 3762165 (1973-10-01), Takenoshita et al.
patent: 3842943 (1974-10-01), Nakamura et al.
patent: 4199943 (1980-08-01), Hunt
patent: 5014823 (1991-05-01), Pelto-Huikko
patent: 5048644 (1991-09-01), Pelto-Huikko
patent: 5243154 (1993-09-01), Tomisawa et al.

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