Hydraulic elevator installation

Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support

Patent

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Details

B66B 126

Patent

active

043514154

ABSTRACT:
This invention provides a hydraulic elevator installation in which a variable hydraulic pump supplies pressure fluid to a hydraulic actuator connected to an elevator cage. The hydraulic pump functions to operate as a hydraulic motor with the pressure fluid discharged from the hydraulic actuator when the elevator is descending. The hydraulic pump is driven by an induction motor. The induction motor begins to function as an induction generator, recovering potential energy on the high speed rotation of the hydraulic motor while it is generating electricity. When the hydraulic pump has started its function as the hydraulic motor.

REFERENCES:
patent: 2565880 (1951-08-01), Pettengill et al.

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