Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1983-03-30
1985-10-22
Rolla, Joseph J.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
187 52R, 744248R, 138114, B66B 1104
Patent
active
045482985
ABSTRACT:
The invention comprises two embodiments of a hydraulically powered rotor and screw elevator equipped with a fail-safe control system. In each embodiment a dual lead steep-pitched screw is embraced by a rotor supporting the cab. In one embodiment the rotor is driven and in the other the screw is driven. In each embodiment the driven component auto-rotates during downward cab travel and is hydraulically driven during upward cab travel by a motor-pump unit. This unit functions as a motor during upward cab travel and as a pump during downward cab travel to provide pressurized fluid to various system components including the hydraulic speed control components. Pressurized fluid is supplied in varying volumes by a plurality of pumps connected in parallel. Both the rotor and the screw are equipped with fail-safe brakes. The driven component in each embodiment includes a normally closed brake releasable by a fail-safe control system including switches, relays and valves cooperating to safeguard against non-functional components and all hazards. The screw may be a tube supported from the upper end of a coaxial tube embracing both the tubular screw and its rotor, the supporting tube being slotted to accommodate brackets between the rotor and the cab or other load.
REFERENCES:
patent: 1970286 (1934-08-01), Dunn
patent: 3120880 (1964-02-01), Joseph
patent: 3474925 (1969-10-01), McCartney et al.
patent: 3802290 (1974-04-01), Grove et al.
Noland Kenneth
Rolla Joseph J.
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