Telescopic container spreader

Details Telescopic container spreader Telescopic container spreader

1981-11-12

1984-09-18

Marbert, James B.

Handling: hand and hoist-line implements

Spacing hoist bar or frame

Load gripping units

B66C 166

Patent

active

044719892

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a construction for telescopic container spreaders. Such spreaders have become necessary because although containers normally have uniform width dimensions, they have differing standard lengths. In order to be able to handle these differing containers with the same spreader, it must be made telescopic.
Such spreaders contain a fixed main beam which usually supports two movable telescope beams arranged within the main beam. In the telescopic beam's outer ends are mounted container locking devices, generally referred to as twist-locks, which during lifting combine with the container's upper corner castings. When the telescope beams are moved outwards to their extreme position, their underside makes direct contact with the outer lower edge of the main beam whilst the upper inner ends of the telescope beams makes direct contact with the upper inside of the main beam. During the lifting of a container both these contact points transfer the forces from the telescope beams to the main beam. The extent of the forces at the stated points is determined partly by the weight lifted at the telescope beams outer ends via the twistlocks and partly by the leverage relationship determined by the distance between the twistlocks, the main beam's lower outer edge, and the telescope beam's inner upper edge. Particularly, the effect on the main beam's lower, outer edge will be very big, which leads to cumbersome and heavy constructions.
The purpose of the invention is to reduce the effect of the stated forces, particularly the very heavy force at the main beam's lower outer edge, so that the spreader can be made lighter in construction. The purpose of the invention is achieved because the main beam's upper gable ends have, above in the direction of the telescope beams movement, parts which extend the outer portion of and on the same side as the telescope beam's outer, end in the contracted position. The extended part increases the length of the upper part of the main beam. The end part extensions accommodate the extended inner end of the telescope beam which moves in the opposite direction. By means of this simple solution, the distance between the force transfer points of the telescope beams and the main beams is increased so much that a considerable reduction of the force's effect is achieved.
The invention is more fully described with reference to the attached drawings.
In FIG. 1 is shown a conventional spreader with both telescope beams in their innermost position and by means of broken lines with both telescope beams in their outermost position.
FIG. 2 shows a spreader in accordance with the invention with the left telescope beam in its outermost position.
In FIG. 1 marked with 1 is the main beam, which through suitable coupling means 2, 3 is united with the lifting equipment which supports the spreader, i.e. a gantry crane, a traverse, a fork-truck or similar equipment. The main beam supports two movable telescope beams 4, 5, which can be extended from an innermost position to varying outer positions determined by the length of the container to be lifted. Usually, this length is variable between 20 ft. and 40 ft. In the telescope beams outer ends are mounted twistlocks 6, 7 arranged to combine with the upper corner castings of the container during lifting. These twistlocks are mounted on a crossbeam at each telescope beam's 4, 5 outer end.
A telescope spreader is usually manufactured to be symetric so that the telescope beams extend from the main beam uniformly, thereby ensuring that the spreader's central axis C and its gravity point will be unchanged, unaffected by the extension of the telescope beams. FIG. 1 shows with broken lines the spreader in its maximum extended position. When the telescope beams 4 is in its outermost position with the twistlock in position 6' the telescope beam's underside rests against a contact part 8 on the main beam's lower, outer edge. The telescope beam's 4 inner upper edge has a contact part 10 which rests against the main beam's inner roof which has a cont

REFERENCES:
patent: 3767250 (1973-10-01), Ward
patent: 4017110 (1977-04-01), Pease et al.

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