Fire escape – ladder – or scaffold – Means maintaining platform level on angularly movable support – Swingable support
Patent
1977-11-21
1979-12-18
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Means maintaining platform level on angularly movable support
Swingable support
212144, B66F 1104
Patent
active
041790103
ABSTRACT:
An accessory for converting a crane of the kind having a telescopically extendible jib pivotally connected to a turntable into access equipment comprising a unit to be fitted to the free end of the jib of the crane, a bracket member pivotally connected to said unit for rotation about a horizontal axis, first hydraulic cylinder means extending between said unit and the bracket and capable of being actuated to adjust the orientation of said bracket relative to the jib of the crane, a boom structure pivotally connected relative to said bracket for movement in a vertical plane about a horizontal axis, a working platform or cage pivotally connected to the end of said boom structure remote from said bracket, second hydraulic cylinder means for causing pivotal movement of said boom structure relative to said bracket and means for maintaining said working platform or cage level regardless of the angle of inclination of said boom structure.
REFERENCES:
patent: 3149694 (1964-09-01), Smithee
patent: 3834488 (1974-09-01), Grove
patent: 3937340 (1976-02-01), Grove
Machado Reinaldo P.
Simon Engineering Dudley Limited
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