Fire escape – ladder – or scaffold – Means maintaining platform level on angularly movable support – Swingable support
Patent
1989-07-18
1990-10-16
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Means maintaining platform level on angularly movable support
Swingable support
182223, B66F 1104
Patent
active
049628275
ABSTRACT:
An extendable, elevatable and rotatable boom carrying at its outer end a basket which is longitudinally collapsible in order to reduce the longitudinal space occupied by the collapsible basket, the boom and basket being adapted to be mounted on a rescue crash or service vehicle having a cab. The collapsible basket may be stored behind the cab with the boom in storage position behind the basket and both the boom and basket when stored, extending upwardly no further than the cab. The cab, with the basket positioned above at least a part of the cab, may have means providing access between the cab and basket, such as a sliding panel of the top of the cab and pivotal front and rear bottom plates of the basket. The rear end of the boom is pivoted on an upper base assembly, in turn pivoted on a lower base assembly, so that when an extendable, preferably multi-stage cylinder pivotally connected to the boom at a point adjacent its inner end, moves the boom upwardly, the front end of the upper base assembly will pivot on the front end of the lower base assembly, as until the upper base assembly is directly above the lower base assembly. A releasable locking mechanism secures the upper base assembly in this position, with further extension of the boom lift cylinder merely increasing the angularity of the boom to the horizontal. The outer half of a turntable is attached to support beams, while the lower base assembly is mounted on the inner half of the turntable. The outer end of the outer cylinder of the boom, when in storage, may be raised by an arm and roller assembly to a position in which the collapsed basket may be unfolded to a position over the cab. The basket may have a front and back connected by sides, each having a hand rail at the top and pivotally connected to the outside of the front and back as well as pivoted about a vertical axis at the center to permit the sides to be folded between the fronts and back after the floor plates are pivoted upwardly.
REFERENCES:
patent: 2938594 (1960-05-01), Eitel
patent: 3005512 (1961-10-01), Vogan
patent: 3056510 (1962-10-01), Garnett
patent: 3258084 (1966-06-01), Robb
patent: 3472337 (1969-10-01), Atchey
patent: 3842933 (1974-10-01), Clark
Machado Reinaldo P.
Van Valkenburgh Horace B.
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