Fire escape – ladder – or scaffold – Means maintaining platform level on angularly movable support – Swingable support
Patent
1975-03-05
1976-11-30
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Means maintaining platform level on angularly movable support
Swingable support
182 36, 182128, 182142, E04G 310
Patent
active
039943658
ABSTRACT:
An apparatus for positioning a person within a container tank for inspection, cleaning, or repair of such tank is described. The apparatus includes a pivoted parallelogram type support having a cage enclosure at one end and a counter balance weight at the other end, such support being pivotally attached to a hoist member for movement of the cage toward and away from the tank wall while maintaining such cage upright. The hoist raises and lowers the support and cage within the tank and through a restricted opening in the tank when the support is pivoted into a retracted position. Bearing means is provided around the hoist stem for guiding vertical movement and enabling manual rotation of the hoist member and cage. A valve actuated cylinder is employed to control the pivoting of the support by manual actuation of the valve from within the cage. A work platform made of folding sections may be attached to the base of the cage, such sections beng folded for passing through the restricted opening and unfolded within the tank to provide additional working area around the cage. A high pressure water line extends down inside the hoist stem to a connector for connecting such line to a high pressure water spray device for cleaning the interior of the tank. The water line is also connected through a pressure reducing valve to the cylinder used to pivot the support member.
REFERENCES:
patent: 2057217 (1936-10-01), Soper
patent: 3163880 (1965-01-01), Johnson
patent: 3183997 (1965-05-01), Kleiss
patent: 3306396 (1967-02-01), Goss
patent: 3880254 (1975-04-01), Fitzgerald
Helversen Frederick D.
Petermann James P.
Thomas Jack A.
Georgia-Pacific Corporation
Machado Reinaldo P.
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