Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1975-06-26
1976-07-20
Blunk, Evon C.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
92 53, 187 95, 254 93R, B66F 920
Patent
active
039701719
ABSTRACT:
A load-lifting assembly for a fork-lift truck has a mast formed of three telescoping tubes, an inner tube secured to the support, an intermediate tube slidable on the inner tube, and an outer tube slidable on the intermediate tube and carrying a carriage on which the fork is mounted. A cable or chain has one end secured to the intermediate tube and is passed over a roller on the top end of the outer tube and secured to the carriage. The three-stage ram has a first member inside the inner tube and secured to the support, a second tubular member slidable on the first member and linked to the intermediate tube, and a third member slidable on the intermediate member and secured to the outer tube. The effective piston area of the third member is greater than that of the second member so that on pressurization of the interior of the ram the third member will move up relative to the first and second members before the second member moves up.
REFERENCES:
patent: 644641 (1900-03-01), Sibley
patent: 1799298 (1931-04-01), Jakob
patent: 2670811 (1954-03-01), Shaffer
patent: 2915144 (1959-12-01), Olson
patent: 3252680 (1966-05-01), Lee et al.
patent: 3279563 (1966-10-01), McNeeley
patent: 3344890 (1967-10-01), Loef
Honecker Gunter
Knappe Kurt
Blunk Evon C.
Dubno Herbert
Linde Aktiengesellschaft
Ross Karl F.
Rowland James L.
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