Material or article handling – Self-loading or unloading vehicles – Separable load rack
Patent
1992-12-17
1995-05-02
Huppert, Michael S.
Material or article handling
Self-loading or unloading vehicles
Separable load rack
414786, 2804252, B60P 164
Patent
active
054113598
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for providing the lifting effect of a lifting transport trailer, wherein the main parts of the trailer-comprise a frame with an essentially horizontal carrying surface or the like, and a lever mechanism comprising: substantially in a vertical plane with respect to the frame and which is connectable to an apparatus or the like provided with means for vertical motions; substantially in a vertical plane with respect to the frame and which is equipped with at least one rotating element such as a bearing wheel; and second frame lever for transmission of the vertical rotational motion of the first frame lever with respect to the frame of the said lifting transport trailer into the rotational motion of the second frame lever and thus for the change, limited by limiter-means or the like, of the vertical distance between the carrying surface of the frame and said at least one rotating organ, particularly in connection with operations related to the loading of the lifting transport trailer.
The lifting transport trailer according to the present invention is intended particularly for handling of goods, and the method according to the invention and the lifting transport trailer used in it are particularly advantageously embodied in the principle of self-loading and self-unloading, used for transportation of loads on pallets. However, the invention is not limited to uses of this kind only, but naturally also other embodiments suitable for use in the handling of goods are possible.
As to the principle of self-loading and self-unloading presented above, the prior art in this field can be illustrated by reference to the patent FI-79061. From this publication, a combination of a lifting transport trailer and a drawgear is known, which is used in combination with a drawing vehicle. In the embodiment according to the said patent, the motion of the frame lifting and lowering a load placed on a bottom is hydraulically operated. A lifting transport trailer made according to this principle is functional; however, it has the disadvantage of structural complexity, which increases the expenses of service, repair and manufacture. An apparatus of relatively complex technology, it is also subject to faults, which increase the risk of damage and thus of stand-stills e.g. related to loading and unloading of ships at harbour terminals. For reasons of efficient use of tied-up capital, it is particularly at sites of this kind that reliable lifting transport trailers are required. In use, the lifting transport trailer according to the patent has the disadvantage that the keyboard for controlling the operations of the lifting transport trailer is, in principle, placed loose within the cab of the drawing vehicle, so that in certain situations in practice, the keyboard may be difficult to control by the driver of the drawing vehicle.
Further, the publications CH-52,709 and GB-1,500,502 can be introduced as prior art to the invention. From these publications, mechanical solutions are known, in which a carrying surface driven by a drawing vehicle, running on wheels and supporting the load is movable in the vertical plane with respect to the wheels. A disadvantage of the embodiments according to these said publications is that they cannot be moved away from below or below the load, and they are thus not suitable for embodiments having the particular principle of self-loading and self-unloading. Moreover, it must be stated particularly of the solution according to GB-1,500,502 that the vertical force e.g. on its first lever arm which is used to move the lever arm., or the removal of the force, always induces a change in the vertical distance between the frame (i.e. the carrying surface) and the wheels, irrespective of whether there is a load on the carrying surface or not. In other words, irrespective of the load, the movement of the first lever arm in the vertical direction always, within the limits by the limiter means in the apparatus, induces a change in the distance between the frame and the wheels, so that e
REFERENCES:
patent: 2858950 (1958-11-01), Martin
patent: 4060145 (1977-11-01), Kingman et al.
Huppert Michael S.
Liftec Products OY
Morse Gregory A.
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