Pneumatic elevator by depressure

Details Pneumatic elevator by depressure Pneumatic elevator by depressure

1992-12-14

1995-09-05

Stephan, Steven L.

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific load support drive-means or its control

Includes control for power source of drive-means

187414, 187285, 187288, 182 48, 472131, B66B 104

Patent

active

054472113

ABSTRACT:
Pneumatic vacuum lift elevator, in which the vertical shaft is a tube with smooth interior surface, preferably cylindrical, with straight axle, and the transport cab or vehicle moving inside such tube is a piston with vertical movement, with minimum play inside the tube, equipped with air suction devices at the upper end of the tube, capable of causing a sufficient pressure differential to displace such piston in controlled ascending and descending movement; completed with an air entry or intake in the lower end of the tube, and the access doors with which the tube is equipped, and which are hermetically closed on the various stopping levels.

REFERENCES:
patent: 3066761 (1962-12-01), Behrens et al.
patent: 3318418 (1967-05-01), Kilpatrick Jr.
patent: 3949953 (1976-04-01), Hopkins
patent: 4023500 (1977-05-01), Diggs
patent: 4545574 (1985-10-01), Sassak
patent: 4948303 (1990-08-01), Good
patent: 4986041 (1991-01-01), Prewer et al.
patent: 4997060 (1991-03-01), Sassak

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