Cargo handling apparatus with a cargo boom which can be swung in

Details Cargo handling apparatus with a cargo boom which can be swung in Cargo handling apparatus with a cargo boom which can be swung in

1985-02-12

1986-01-21

Blix, Trygve M.

Traversing hoists

Having horizontally swinging boom or bridge

And vertically swinging

212191, B66C 2306, B66C 2352

Patent

active

045652929

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a cargo handling apparatus with a cargo boom which can be swung in a swivel bearing between two kingposts. Such cargo handling apparatus are well known in the art, for instance from U.S. Pat Nos. 2,914,193; 3,236,390 and 3,107,790. More specifically, the invention relates to a cargo handling apparatus of this type which carries an auxiliary hoist at the upper end of an extension which projects beyond the fittings of the main hoist. The block fitting of the auxiliary hoist which carries the upper cargo block and the guide sheave is rotatable about the axis of the cargo boom, and the guide sheave and the cable sheaves of the upper cargo block are arranged on the block fitting eccentrically of the axis of rotation thereof. The spacing of the block fitting of the auxiliary hoist from the fittings of the main hoist is at least sufficiently large so that, with the lower cargo block and cargo hook of the auxiliary hoist moved into the raised position and with an approximately vertical position of the cargo boom, the lower edge of the cargo hook is free of the fittings of the main hoist. Such a cargo handling apparatus is described for instance in German Patent Publication No. 2811384, published Sept. 20, 1979.
With cargo handling apparatus of the above described kind it is however often desirable for crane work, and in particular also for floating cranes operating off-shore, to have available, in addition to the main hoist and an auxiliary hoist, a further or second auxiliary hoist even though this may only be required for smaller loads.
The problem underlying the invention is to provide assistance in this aspect.
In order to solve this problem, in cargo handling apparatus of the above type a block fitting of a second auxiliary hoist is connected, fixedly or for only limited rotational movement, by means of a second extension of the cargo boom with the block fitting of the first auxiliary hoist which is rotatable about the axis of the cargo boom. Also, with the lower cargo block and the cargo hook moved into the raised position and an approximately vertical position of the cargo boom, the lower side of the cargo hook of the second auxiliary hoist is preferably free of the block fitting of the first auxiliary hoist.
This connection, in accordance with the invention, of the block fitting of the second auxiliary hoist with the block fitting of the first auxiliary hoist means that the second auxiliary hoist is necessarily turned together with the first auxiliary hoist, when the first auxiliary hoist rotates through approximately 180.degree. to the other working region as the cargo boom is swung through the plane of the kingposts, so that the second auxiliary hoist likewise hangs free for operation over the other working region.
In a further development of the invention the block fitting of the second auxiliary hoist can make restricted rotational movements through an angle of approximately .+-.15.degree. about the axis of the second cargo boom extension with the movement being limited by stops.
This possibility of the block fitting of the second auxiliary hoist rotating through approximately .+-.15.degree. about the axis of the second cargo boom extension is advantageous when it is necessary for the two auxiliary hoists to pull at an angle to one another. On the other hand, it is also necessary to restrict the freedom of rotation in order to ensure that the second auxiliary hoist is also rotated into the other working region as the cargo boom is swung through the plane of the kingposts.
Finally, the second auxiliary hoist can operate independently of the first auxiliary hoist and, with appropriate dimensioning of the connection, can also operate simultaneously.
The invention will be described further below in more detail with reference to the attached drawings, in which:
FIG. 1. shows the lower portion of a cargo handling apparatus in accordance with the invention in the working position;
FIG. 2 shows the uppermost portion of the cargo handling apparatus in greater detail;
FIG. 3 shows anothe

REFERENCES:
patent: 964534 (1910-07-01), McGiffert
patent: 2515777 (1950-07-01), King et al.
patent: 2902177 (1959-09-01), Stoddard et al.
patent: 2947516 (1960-08-01), Jackson
patent: 3107790 (1963-10-01), Lehmann
patent: 3125227 (1964-03-01), Kauffman et al.
patent: 3236390 (1966-02-01), Sprengel

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