Traversing hoists – Traveling bridge – Having specific engager for load
Patent
1994-10-28
1997-04-08
Brahan, Thomas J.
Traversing hoists
Traveling bridge
Having specific engager for load
212319, 294 814, 901 16, B66C 1704
Patent
active
056179642
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase of PCT/EP 93/01367 filed 1 Jun. 1993 and based upon German National application P42 19 370.2 filed 13 Jun. 1992 under the International Convention.
FIELD OF THE INVENTION
The invention relates to a lifting means comprising a horizontally movable construction part and a load receiving means which can be raised and lowered in relation to the former, suspended from the construction part by elements adapted to be subjected to tensile loads and adapted to be rigidly connected to a load. The mobile construction part can be a crane trolley designed to travel on a bridge or an overhead travelling crane, but it may also be part of a jib or portal of a crane vehicle. The mobile construction part may thus be moved in relation to another mobile part of a lifting means (e.g. as a crane trolley in relation to the likewise mobile girder of an overhead travelling crane) or as a fixed part of a lifting means which is horizontally movable as a whole (e.g. a portal crane). The load receiving means may in particular be designed as a spreader for containers, semi-trailers etc. It is important that the load receiving means, when the load is trans-loaded is firmly connected to the load so that in the course thereof no relative movements between the load and the load receiving means can take place.
BACKGROUND OF THE INVENTION
In the reloading of containers, interchangeable superstructures, road truck units etc. these are raised and lowered vertically and are moved horizontally. In order to obtain high reloading rates, short movement periods are desired involving high accelerations and correspondingly high transverse forces.
Where load receiving means are suspended from ropes the travelling movements of the crane trolley and/or bridge result in swinging movements of the load receiving means, whereby a rapid gripping of the load is impeded. Where the load has already been picked up pendulum-like oscillations take place whereby an accurate setting down of the load, e.g. onto the chassis of a vehicle, is made quite difficult. The problem of pendulum movement also may result from wind action.
Although pendulum damping means are known in which the ends of the ropes are fixed to hydraulic cylinders, the operation of the hydraulic cylinders requires considerable control effort which can only reduce the problem of pendulum movements but can never eliminate it entirely.
Where the load receiving means are suspended from ropes which for trans-loading are to be firmly connected to the load the problem exists, in particular where the load is askew, that the load receiving means must be brought into the correspondingly askew position. Such positioning, in known apparatus involving traction ropes, is brought about by the aforesaid hydraulic cylinders. In spite of the control means required therefore considerable time delays may result where the load is in an askew position because of gravitational effects.
A particular problem results if the load--seen in a plan view--is angularly displaced in relation to the load receiving means. A pivoting of a load receiving means suspended from ropes is possible only to a lesser degree and with extraordinary effort.
OBJECT OF THE INVENTION
Accordingly it is an object of the invention to provide a lifting means as set out in the introduction, so improved that pendulum movements of the load receiving means and, where applicable of the load gripped thereby, in relation to the mobile construction part can be avoided in a simple manner, whereby the transloading rate can be increased. Moreover the load receiving means should be adapted to be more readily positioned in order to grip a load.
SUMMARY OF THE INVENTION
This object is attained in accordance with the invention in that the elements adapted to be subjected to tensile loads are formed by at least six longitudinally individually adjustable hydraulic control cylinders, each being linked by way of a three-dimensionally movable linkage to the mobile construction part and t
REFERENCES:
patent: 2822094 (1958-02-01), Greer
patent: 4433952 (1984-02-01), Glickman
patent: 4883388 (1989-11-01), Cherbonnier
patent: 4988244 (1991-01-01), Sheldon et al.
patent: 5129279 (1992-07-01), Rennex
Lucking Manfred
Mende Burkhard
Brahan Thomas J.
Dubno Herbert
Krupp Fordertechnik GmbH
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