Traversing hoists – Traveling bridge – Having vertical supporting legs
Patent
1994-12-28
1997-01-14
Brahan, Thomas J.
Traversing hoists
Traveling bridge
Having vertical supporting legs
212294, B66C 504
Patent
active
055930506
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a bridge crane and more particularly ship's bridge crane, comprising a bridge, which has two transverse bearers extending parallel to one another and constituting a track for the travelling crane and folding lateral parts, respectively pivoted at the ends of the bearers, for the selective extension of the track.
BACKGROUND OF THE INVENTION
Bridge cranes are for instance erected on ocean going ships. The crane is as a rule employed for loading and unloading containers, bulk goods and timber. For more rapid unloading of ships it is frequent practice to employ at least two such bridge cranes.
A number of forms of such cranes have been proposed. Lateral parts are pivoted on two transverse bearers for selective extension of the track so that they are able to be swung out from the position in line with the transverse bearers through 180.degree. into an inactive position in which they are folded back against the transverse bearers on the outside and extend in parallelism to the transverse bearers. This however leads to the disadvantage that no goods may be loaded in the way of the swinging lateral parts and adjacent to the bridge crane. This is especially a disadvantage in the case of container freighters. For the optimum use of the cargo space a plurality of layers of containers must be loaded, it normally is desirable for the pivotal path of the lateral parts to be used as well. This means in practice that aboard container ships conventional bridge cranes are only able to be utilized, after the layers of containers placed adjacent to the bridge cranes have been removed with external load cranes.
SUMMARY OF THE INVENTION
One object of the present invention is to provide such an improved form of a bridge crane of the sort noted initially that only requires a minimum amount of space for operation thereof.
Taking as a starting point a bridge crane of this type this object is to be achieved since the lateral parts are able to be folded from a position in which they are in line with the transverse bearers through 90.degree. into their inactive position wherein the tips thereof are pointed towards the respectively other transverse bearer.
In accordance with this design the lateral parts are no longer swung outwards about the transverse bearer and consequently around the bridge crane and instead are merely folded inwards through 90.degree.. Accordingly it is then possible for the bridge crane to be brought into the operating position even if bulky freight, as for instance containers, is stacked directly adjacent to it. Furthermore the pivotal displacement to be made by the lateral parts is shortened. This leads to a shorter get-ready time for the bridge crane moved out of its inactive position.
In keeping with yet another possible form of the invention the transverse bearers can be at different heights in relation to one another so that the lateral parts are superposed in their inactive position. In this case the lateral wall parts respectively carrying the running gear are so adapted to the height of the transverse bearers so that the travelling crane is arranged substantially horizontally.
In accordance with further developments of the invention the lateral parts may be respectively folded parallel to the legs downwards, outwards perpendicularly to the transverse bearers and upwards into positions extending the legs. The lateral parts may furthermore be folded through 180.degree. upwards so that they lie on top of the transverse bearers.
A secondary travelling crane unit may be arranged on the travelling crane and may bear an unloading device.
The lateral parts may be folded hydraulically or electrically, that is to say using a suitable electric motor, out of their inactive position into the position in which they are in line with the transverse bearers. The lateral parts may furthermore be designed to telescope.
Further advantageous developments and convenient forms of the invention will be understood from the following detailed descriptive disclosure of one emb
REFERENCES:
patent: 1428809 (1922-09-01), Zimmerman
patent: 3258129 (1966-06-01), Munck
patent: 5140925 (1992-08-01), Tyring
Brahan Thomas J.
Liebherr-Werk Nenzing Ges.M.B.H.
LandOfFree
Bridge crane does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Bridge crane, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bridge crane will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1382302