Elevating apparatus
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United States of America Patent
Stats
-
Jan 27, 1987
Grant Date -
N/A
app pub date -
Apr 30, 1985
filing date -
May 1, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Cited Art Landscape
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