Traversing hoists – Traveling bridge – Having vertical supporting legs
Patent
1994-12-21
1997-05-06
Brahan, Thomas J.
Traversing hoists
Traveling bridge
Having vertical supporting legs
212322, B66C 504
Patent
active
056262477
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a procedure for moving the main girder and trolley of a crane and to an apparatus therefore.
DESCRIPTION OF RELATED ART
In previously known technology, low-profile container cranes, especially those used in harbours, have a gantry part which can be moved longitudinally on the quay along rails provided for the crane. Mounted on the gantry part is a horizontal main girder which, when in the working position, extends over the ship at the quay. At the end of the working period, the main girder is moved away from its position over the ship to a rest position or to a new working position on the opposite side. In these low-profile cranes, this movement generally takes place in the horizontal direction. The main girder is provided with horizontal rails carrying a movable trolley which transfers the containers from the ship to the quay and vice versa. For moving the trolley, the machine room of the crane is provided with a traversing machinery comprising a traversing motor and a gear system, a winding drum and traversing ropes between the winding drum and the trolley. Moreover, the machine room contains a traversing machinery for moving the main girder which generally comprises the same kind of equipment as the traversing machinery moving the trolley. In addition to the two traversing machineries, the machine room contains a hoisting machinery comprising substantially the same kind of equipment as the traversing machineries. There are also solutions with two machine rooms, enabling one of the traversing machineries or the hoisting machinery to be placed in a separate machine room.
An obvious drawback with the previously known technology described above is that the machine room is crowded because it contains three different machineries. Further drawbacks are the difficulty of accommodating three different sets of ropes and the diverting pulleys needed for them, and the structural complexity and high cost resulting from the large number of parts. In this type of previously known solutions, the trolley generally moves along when the main girder is moved, involving the disadvantage of a complicated control arrangement. Another drawback involved is that the crane operator has to drive the trolley separately to a parking position or to walk along the main girder from the operator's cabin to a ladder or elevator on the gantry.
SUMMARY OF THE INVENTION
The object of the present invention is to eliminate the drawbacks mentioned above and to achieve a simple and reliable procedure for moving the main girder and trolley of a crane. The procedure of the invention is characterized by the trolley being moved by means of the same transversing machinery as the main girder.
The apparatus of the invention is characaterized by a locking mechanism which locks the trolley in place with respect to the gantry part.
The advantages provided by the solution of the invention are simplicity, reliability and reduced costs, because one of the traversing machineries can be left out altogether. A further advantage is a space saving both in the machine room and in the structures of the main girder as several ropes and diverting pulleys are left out. It follows from these advantages that the machineries can be more easily serviced because there is more room in the machine room and in the girder structures. Yet another advantage is that there is a fixed parking place for the trolley where it can be locked, so the crane operator has an easy access from the cabin to the stairway or elevator.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
BRIEF DESCRIPTION OF THE DRAWIN
REFERENCES:
patent: 3154025 (1964-10-01), Worthington
patent: 3249236 (1966-05-01), Kummerman
patent: 3358854 (1967-12-01), Montgomery
patent: 3945503 (1976-03-01), Cooper
patent: 4106641 (1978-08-01), Campbell et al.
patent: 4392574 (1983-07-01), Theysken
Hakala Ilpo
Soderena Soini
Brahan Thomas J.
KCI Konecranes International Corporation
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