Static structures (e.g. – buildings) – Mechanism operated relatively movable shaft assembly – Fluid pressure actuated
Patent
1981-10-27
1984-07-17
Bell, J. Karl
Static structures (e.g., buildings)
Mechanism operated relatively movable shaft assembly
Fluid pressure actuated
52118, 52731, B66C 2362, E04H 1218
Patent
active
044597860
ABSTRACT:
An improved, high strength extensible crane boom is provided which has a plurality of elongated, tubular, telescopically interfitted, longitudinally bowed, prestressed boom sections, along with a low cost method of fabricating the respective boom sections. Each boom section preferably includes an elongated upper plate having a channel structure welded to the underside thereof to form a polygonal body; permanent bowing of the body is accomplished as an incident to the welding sequence by virtue of asymmetrical heating and subsequent cooling of the metallic boom components. The boom sections are advantageously pentagonal in cross section, and the separate sides of the channel structures are simultaneously welded to the upper plates to evenly heat the plates and minimize torsional distortion of the sections.
REFERENCES:
patent: 3837502 (1974-09-01), Hornagold
patent: 3985234 (1976-10-01), Jouffray
patent: 3992836 (1976-11-01), Mitra
patent: 4038794 (1977-08-01), Young
patent: 4171597 (1979-10-01), Lester
Cranes Today, Cole Achieves Dramatic Rise in Liftability with Tele Boom Reappraisal, Feb. 1980.
Bornowski Robert M.
Pitman Raymond F.
Bell J. Karl
RO Corporation
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