Static structures (e.g. – buildings) – Mechanism operated relatively movable shaft assembly – Tilts relative to base
Patent
1978-05-16
1981-06-16
Friedman, Carl D.
Static structures (e.g., buildings)
Mechanism operated relatively movable shaft assembly
Tilts relative to base
212267, 52632, E04H 1234
Patent
active
042729327
ABSTRACT:
An improved telescopic boom for a truck mounted hoist in which at least the middle telescoping section of the boom is fabricated from I-section structural steel having a central web, and upper and lower flanges, the flanges having inwardly facing surfaces lying in angled planes which are not normal to the plane of the web, and in which the trolley and fixed portion of the boom are fabricated of any other suitable structural material, and having at least two sets of identical rimmed wheels, one set mounted directly on the fixed section, and the other set mounted directly on the trolley, without the use of tilting arms, the two sets of wheels riding in opposite sides of the I-section material of the telescopic intermediate section, with the tread of the wheels carrying the load and with the rims providing lateral guidance thereby dispensing both with the mounting arms and with the lateral guide rollers.
REFERENCES:
patent: 3129821 (1964-04-01), Graham et al.
patent: 3307713 (1967-03-01), Bopp
patent: 3516553 (1970-06-01), Reske
Frank William F.
Friedman Carl D.
Rolston George A.
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