Tower crane

Details Tower crane Tower crane

1974-08-21

1976-01-27

Spar, Robert J.

Traversing hoists

Overhead

Cable

212 46B, 2541391, B66C 2362

Patent

active

039347290

ABSTRACT:
A tower pivotally connected to a base mounting on a mobile platform is movable by raising means between a vertical operating position and a substantially horizontal travel position. A turntable at the top of the tower carries a tiltable unit which includes a jib support means and a jib pivotally connected to the jib support and adapted for luffing movement by a first hydraulic cylinder means connected between the jib and jib support means. The tiltable unit is pivotally connected to the tower and a second hydraulic cylinder means is connected to pivot the tiltable unit between an operating position and a folded position. After the jib is lowered by the first hydraulic cylinder means to an angle between about 60.degree. and 90.degree. with the tower axis the second hydraulic cylinder means pivots the tiltable unit through an equivalent angle to fold the jib alongside the tower when the tower crane is being moved from the vertical operating position to the substantially horizontal travelling position on the mobile platform.

REFERENCES:
patent: 2985429 (1961-05-01), Tourneau
patent: 3134488 (1964-05-01), Brekelbaum et al.
patent: 3246769 (1966-04-01), Noll et al.

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