Fire escape – ladder – or scaffold – Having transpositioning base and erecting means – Ladder pivotably mounted on transpositioning base
Patent
1988-06-10
1989-05-30
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Having transpositioning base and erecting means
Ladder pivotably mounted on transpositioning base
182127, 182 17, E06C 504
Patent
active
048342157
ABSTRACT:
An aerial device--motor vehicle fire fighting assembly in which a movable frame carrying an aerial device is connected between the fifth wheel of the tractor vehicle and the forward end of the fixed frame of the trailer vehicle. The connection between the movable and fixed frames is pivotal about a transverse horizontal axis under the control of hydraulic piston and cylinder units. The units effect relative pivotal movements between the movable and fixed frames and fixedly retain the same together into different positions of pivotal movement including (1) a transporting position wherein the movable frame constitutes a rigid forward extension of the fixed rearward frame enabling the entire trailer to turn and tilt with respect to the fifth wheel connection of the tractor during the power driven movement thereof and (2) an aerial device operating position wherein the movable frame extends horizontally in a longitudinal direction from the fifth wheel connection of the tractor to the fixed frame in a multiplicity of different positions of longitudinal inclination assumed by the tractor and the fixed frame by virtue of the longitudinally spaced vertical levels of engagement of the front wheels of the tractor with respect to the wheels of the fixed frame. Normally, retracted outrigger assemblies are extendible into an operative position of ground engagement to support the movable frame when in the aerial device operating position. An emergency load-bearing mechanism is provided to back up the piston and cylinder units in the event of hydraulic failure.
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