Tower crane

Details Tower crane Tower crane

1974-08-21

1976-03-16

Spar, Robert J.

Traversing hoists

Overhead

Cable

212 46A, 212 55, 212 57, 212 58R, 212 59R, B66C 2362

Patent

active

039440818

ABSTRACT:
A tower pivotally connected to a base mounting on a platform is movable by raising and lowering means between a vertical operating position and a substantially horizontal stored position. A turntable has its non-rotatable part hingedly connected to the top of the tower and a jib support structure including a cab is connected to the rotatable part of the turntable and includes jib support brackets extending above the cab to which a jib is pivotally mounted for luffing movement by a power means connected between the jib and jib support structure. And second power means connected between the non-rotatable part of the turntable and the top of the tower are operative to fold the turntable, jib support structure and jib 180.degree. about the hinge connection to an inoperative position alongside the tower when the tower is moved to the stored position and unfold to an operative position on top of the tower when the tower is moved to the vertical operating position.

REFERENCES:
patent: 2985429 (1961-05-01), Tourneau

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