Vehicular self-propelled aerial work platform and telescoping parallelogram boom therefor

摘要

A vehicular self-propelled aerial work platform wherein a lower telescopic boom assembly is connected to a riser frame assembly having an upper telescopic boom assembly also connected thereto. A work platform is connected to the outer end of the upper telescopic boom assembly. Both the lower telescopic boom assembly and the upper telescopic boom assembly can be elevated and extended to increase the reach of the aerial work platform. The lower telescopic boom assembly comprises tubular telescoping boom sections connected at opposite ends between a support on a turntable and the riser frame assembly, with a telescopic cylinder extending interior of the boom sections and connected at opposite ends between the same members providing a telescoping parallelogram boom mechanism, with hydraulic controls with interlocks for operating the boom in a predetermined sequence.