Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1985-04-30
1987-01-27
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
182141, 182 2, B66B 920
Patent
active
046388877
ABSTRACT:
An elevating apparatus includes a base such as a mobile chassis, a platform, a telescopic boom assembly connecting the base and the platform together, the telescopic boom assembly being composed of a plurality of telescopically coupled booms axially aligned with each other, at least one first hydraulic cylinder disposed in the telescopic boom assembly for extending and contracting the telescopic boom assembly, a pair of second parallel hydraulic cylinders operatively coupled between the telescopic boom assembly and the base for tilting the telescopic boom assembly with respect to the base, a pair of parallel third hydraulic cylinders operatively coupled between the telescopic boom assembly and the platform for keeping the platform substantially parallel to the base, and a hydraulic control system for operating the first, second, and third hydraulic cylinders in synchronism to move the platform toward and away from the base in a substantially perpendicular relation to the base while the platform is stably maintained parallel to the base.
REFERENCES:
patent: 3516513 (1970-06-01), Robertson et al.
patent: 3893540 (1975-07-01), Beucher
patent: 4116304 (1978-09-01), Durnell
patent: 4185426 (1980-01-01), Prescott
patent: 4518061 (1985-05-01), Wehmeyer et al.
Kabushiki Kaisha Hikoma Seisakusho
Noland Kenneth
Rolla Joseph J.
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