Static structures (e.g. – buildings) – Mechanism operated relatively movable shaft assembly – Tilts relative to base
Patent
1994-11-02
1996-05-14
Friedman, Carl D.
Static structures (e.g., buildings)
Mechanism operated relatively movable shaft assembly
Tilts relative to base
52121, 52632, 212231, 212264, 212350, B66C 2300
Patent
active
055156541
ABSTRACT:
A telescopic boom including an elongated hollow outer boom, an elongated inner boom telescopically received within the outer boom, and guidance structure for guiding the inner boom for telescopic movement is provided. The guidance structure includes a plurality of guide rails attached to the interior corners of the outer boom, a first roller assembly attached to one end of the inner boom, and a second roller assembly attached to one end of the outer boom. The first roller assembly includes a plurality of wheels mounted on axles for engaging the guide rails. Each of the wheels includes an arcuate rail-engaging portion which presents a radius of curvature equal to the radius of curvature of the guide rails. The second roller assembly includes a pair of roller bars positioned on opposed sides of one end of the outer boom for guiding the inner boom during telescopic movement. Each of the roller bars extends transverse to the longitudinal axis of the outer boom and is rotatably mounted on an elongated shaft.
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Friedman Carl D.
McTigue Aimee E.
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