Ball screw elevator drive system

Details Ball screw elevator drive system Ball screw elevator drive system

1990-10-30

1992-01-14

Valenza, Joseph E.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187 26, B66B 1102

Patent

active

050802003

ABSTRACT:
The elevator car is suspended on cables which are entrained on a pulley, and which have ends distal of the car anchored to the hoistway floor. The pulley is journaled on an upper end of a lift tube which is telescoped into a cylindrical housing anchored to the hoistway walls. A ball screw drive is mounted inside of the lift tube and is rotated therein by a reversible DC motor housed in the hoistway pit below the ball screw. A ball nut assembly is mounted on the ball screw and fixed to the lift tube so that rotation of the ball screw results in raising and lowering the lift tube and pulley. This causes concurrent raising and lowering of the elevator car in the hoistway. An electromagnetic brake selectively acts on the DC motor to hold the elevator car in place in the hoistway at landings.

REFERENCES:
patent: 434372 (1890-08-01), Andersen
patent: 491249 (1893-02-01), Reynolds
patent: 1161255 (1915-11-01), Schnitzer
patent: 1901726 (1933-03-01), Bonnet
patent: 1977484 (1933-10-01), Lagerquist et al.
patent: 3215227 (1963-03-01), MacChesney

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