Material or article handling – Elevator or hoist and loading or unloading means therefor – Magnet and grab
Patent
1992-09-30
1994-05-10
Bucci, David A.
Material or article handling
Elevator or hoist and loading or unloading means therefor
Magnet and grab
294 2, 294 655, 294 8152, 414626, 414669, 414672, B66C 104, B66C 128
Patent
active
053103041
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a load-lifting device. The load lifting device includes a load-carrying beam at whose underside are arranged load-lifting magnets and which has on both sides vertical support columns, wherein securing arms of a load-securing device are arranged on the vertical support columns so as to be swingable in and out about a vertical axis each, and wherein the securing arms engage underneath a suspended load when oriented toward each other in a secured position.
PRIOR ART
Load-lifting devices of the above-mentioned type are known, for example, from German Patent 17 46 42. In a type of such load-lifting devices, the load securing devices consist of stirrups which can be swung transversely of the axis of the load-carrying beam from a position of rest in which the securing arms are located above the load-carrying beam into the secured position in which the securing arms ar located underneath the suspended load. It is a disadvantage in this device that, on the one hand, the swinging path of the load-securing arms from the upper into the lower position requires a very large lateral free space. On the other hand, the securing arms are effective only at a certain distance from the load-lifting magnet, so that a free space may exist between the load and the securing arm, so that the load may drop onto the securing arm when the magnet force fails, which may lead to damage of the securing arm and the securing device. In another embodiment of the load-lifting device, the above disadvantages are partially eliminated by the fact that securing arms can be swung in and out about a vertical axis extending transversely of the load-carrying beam from a free position parallel to the load carrying beam into a secured position transversely of the load carrying beam. Also in this case, the securing arms have the above-mentioned disadvantageous free distance from the suspended load.
DE 31 12 348 A1 describes a load-lifting device which has a load carrying beam with two load-lifting magnets and a load-securing device. The latter includes two rigid safety stirrups which each have an upper essentially horizontal girder to whose ends are integrally connected vertically downwardly extending webs which, in turn, have short securing arms which engage under a suspended load in the secured position. The safety stirrups are swingably fastened to a lifting device. This load-securing device has a number of decisive disadvantages. Because of the rigid configuration of the safety stirrups, the latter require a relatively large free space when being swung to the side; in order to limit the latter, the securing arms can only be short, so that they cannot engage under the suspended load over the entire width. Therefore, the load-lifting device is only suitable for individual slabs, but not for receiving bundled goods which would fall through between the securing arms when the load-lifting magnets fail. The rigid configuration of the safety stirrups restricts the use of the load-lifting device to very narrowly defined dimensions of the slabs. This is reinforced by the requirement that the safety stirrup must in the secured position rest with its upper horizontal girder on the load-carrying beam. Consequently, there is neither an adjustment of the rigid safety stirrup to different load dimensions, nor do the securing arms rest against the load, so that there remains a free gap between load and securing arm with the attendant above-mentioned disadvantages.
DISCLOSURE OF THE INVENTION
It is the object of the invention to construct a load-lifting device of the above-mentioned type in such a way that the load-securing device requires a minimum of lateral free space, and that it is ensured that the suspended load is secured in an optimum manner while still permitting a relatively light-weight construction.
In accordance with the present invention, the support columns are each arranged on upper support arms which are swingably fastened to a lifting device, wherein the lifting device is supported by the load-carryin
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patent: 3606056 (1971-09-01), Morgan
patent: 4975018 (1990-12-01), Langenbacher et al.
Bucci David A.
Heppenstall Holding AG
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