Traversing hoists – Overhead – Cable
Patent
1974-08-21
1976-02-24
Spar, Robert J.
Traversing hoists
Overhead
Cable
212 46B, 2541391, B66C 2362
Patent
active
039399885
ABSTRACT:
A tower crane tower pivoted at its base to a mobile platform for movement from a horizontal travel position to a vertical operating position has a jib support structure mounted at the top of the tower which includes a part rotatable about the vertical axis of the tower, pivot structure connecting a jib to the tower including a jib pivot connecting the jib to the jib support structure, a hydraulic cylinder connected for luffing the jib, and jib alignment structure operatively connected between the jib support structure and the jib and being movable to alter the disposition of the jib pivot and an end of the jib luffing cylinder relative to the tower in such a way as to alter the angle between the jib and the tower axis without operation of the jib luffing cylinder, the jib alignment structure arranged to move between an operating position, in which the jib luffing cylinder can luff the jib between a raised position above the top of the tower and a lowered position in which the jib forms an angle of the order of 90.degree. with the tower axis; and a folded position in which the jib is angularly moved through a folding angle roughly equivalent to the previous mentioned angle, such that the jib is moved to a folded position in close alignment with the side of the tower by combined operation of the jib alignment structure and the jib luffing cylinder.
REFERENCES:
patent: 2985429 (1961-05-01), Tourneau
patent: 3134488 (1964-05-01), Brekelbaum et al.
patent: 3246769 (1966-04-01), Noll et al.
General Crane Industries Limited
Oresky Lawrence J.
Spar Robert J.
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