Fire escape – ladder – or scaffold – Means maintaining platform level on angularly movable support – Swingable support
Patent
1986-04-01
1987-09-22
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Means maintaining platform level on angularly movable support
Swingable support
182 63, B66F 1104
Patent
active
046949305
ABSTRACT:
A lifting apparatus comprising a chassis, a platform, a stretchable boom assembly comprising lower, middle, upper and cover member respectively axially aligned with each other, a sliding member mounted on the upper boom including a hydraulic cylinder, and other three hydraulic cylinders respectively mounted in the lower boom, between the lower boom and the chassis and between the upper boom and the platform, a hydraulic control system for operating the three hydraulic cylinders in synchronism to move the platform toward and away from the chassis in a substantially perpendicular relation to the chassis. Load on the platform is imposed on the cover member, next on the stretchable member so that the load on the platform is stably movable horizontally and vertically irrespective of the level difference provided between each of the stretchable boom assembly.
REFERENCES:
patent: 3776367 (1973-12-01), Grove
patent: 3809180 (1974-05-01), Grove
patent: 3856108 (1974-12-01), Grove
patent: 3893540 (1975-07-01), Beucher
patent: 4019604 (1977-04-01), Benson
Kabushiki Kaisha Hikoma Seisakusho
Machado Reinaldo P.
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