Multi-stage extendable tower

Details Multi-stage extendable tower Multi-stage extendable tower

1983-04-14

1984-09-04

Bell, J. Karl

Static structures (e.g., buildings)

Mechanism operated relatively movable shaft assembly

52113, 52121, 254364, B66C 2306

Patent

active

044689047

ABSTRACT:
A multi-stage extendable tower for controlled elevated support and positioning of workmen and equipment having a plurality of telescoping frame sections that may be raised from a collapsed nested position to a partially or fully extended position. Functionally positioned and interconnected between each adjacent frame section is at least one heavy-duty coiled spring whose potential energy stored in torsion provides sufficient lifting force to overcome the weight of the above frame members, workmen and equipment. Both manual and motorized means are disclosed and claimed for effecting compression and renesting of the frame members.

REFERENCES:
patent: 2243940 (1941-06-01), Ball
patent: 2481037 (1949-09-01), Pringle
patent: 2675211 (1954-04-01), Regoord
patent: 2692169 (1954-10-01), Phillips
patent: 3359559 (1967-12-01), Guinn
patent: 3555748 (1971-01-01), Herman
patent: 3848703 (1974-11-01), Rundle
patent: 4003552 (1977-01-01), Sobolewski

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