Articulated boom including tensioning apparatus

Fire escape – ladder – or scaffold – Means maintaining platform level on angularly movable support – Swingable support

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Details

254228, B66F 1104

Patent

active

050167316

ABSTRACT:
An aerial lift comprising a frame, an articulated boom including a first and second boom portions, a workman support structure mounted on the upper end of the second boom portion for pivotal movement relative thereto about a generally horizontal axis, and a mechanism for leveling the workman support structure throughout the range of movement of the first and second boom portions, the leveling mechanism including first and second sections of elongate material extending through the boom portions, a hydraulic assembly connected to the second section and including a hydraulic cylinder, a piston dividing the cylinder into first and second chambers, and a piston rod having one end fixedly connected to the piston, and a hydraulic accumulator communicating with one of the chambers.

REFERENCES:
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patent: 3049194 (1962-08-01), Brendel
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patent: 3302480 (1967-02-01), Puryear et al.
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patent: 4081055 (1978-03-01), Johnson
patent: 4360187 (1982-11-01), Chapman
patent: 4429763 (1984-02-01), Houck
patent: 4484732 (1984-11-01), Gould
patent: 4512436 (1985-04-01), Freudenthal et al.

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