Title: Tower crane

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.

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Inventors: Wellman, Donald E. (Komoka, CA, US)

Application Number: 499419
Filing Date: 1974-08-21
Publication_date: 1976-03-16
Assignee: General Crane Industries Limited (London, CA)
Primary Class(es): 212/296 212/297
Other Classes:
US Patent Ref:

2985429

May, 1961

Tourneau

254/139.

Other Refs: 1,039,3151,096,0781,113,698

Aug, 1966	UK
Dec, 1967	UK
Apr, 1956	FR

Primary Examiner: Spar, Robert J.
Assistant Examiner: Oresky, Lawrence J.
Attorney: Brady, O'Boyle & Gates