Air cargo pallet

Details Air cargo pallet Air cargo pallet

1992-07-13

1994-02-08

Dorner, Kenneth J.

Horizontally supported planar surfaces

Industrial platform

With load-confining means

108 511, B65D 1938

Patent

active

052840980

DESCRIPTION:

BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION

This application is a national phase of PCT/DE91/00187 filed 2 Mar. 1991 and based, in turn, on German National Application P 40 06 479.4 of 2 Mar. 1990 under the International Convention.


FIELD OF THE INVENTION

The invention relates to an air cargo pallet consisting of a quadrangular, square or rectangular plate of light metal, trimmed around the outer edges with a hollow profile of light metal and connected with this hollow profile by rivets, whereby the light-metal hollow profile, besides having a lower closed hollow space, has above a longitudinal slot with a T-shaped cross section, upwardly open at the end of the T-web, for holding elements of stretching nets, those elements being shaped approximately like mushrooms or plungers longitudinally slidable and insertable or removable with their mushroom or plunger heads in the enlarged circularly shaped spaces of the upper open area of the slot, by means of which the stretching nets can be securely tied down to the pallet and whereby the light-metal hollow profiles are connected through miter-cut sections at the corners of the pallet, these miter-cut sections being interconnected in a shear-resistant manner.


BACKGROUND OF THE INVENTION

Air cargo pallets are supposed to be particularly light, but capable of carrying heavy loads. The light-metal plate can not insure this heavy-load carrying capability by itself. Depending on the load, such pallets can be bent out of shape. Therefore, the light-metal hollow profiles primarily have an enhancing effect on the load-carrying capability.
The light-metal hollow profiles also have another function due to their flat outer edges. Aircraft and partially also land transportation equipment and storage facilities are mostly equipped with holding systems such as holding claws or the like, and the air cargo pallets with their flat outer edges can be slid under these holding claws. In this way, the pallets are prevented from tilting during inclined positions or accelerations, etc.
Finally, the upwardly open T-shaped longitudinal slots serve for securing to the air cargo pallet the cargo which is loosely piled on the pallet, by means of stretching nets. Mushroom or plunger shaped heads, similar to the ones used for window curtains, are introduced into the longitudinal slots at the enlarged portions and arrested.
On their bottom side along their inner margins the light-metal hollow profiles have a step-like shoulder into which the light-metal plate is inserted so that at the bottom it is flush with the light-metal hollow profile, pressing with its edges against the shoulder at which it is riveted to the light-metal hollow profile. In this way the highest degree of strength and safety is achieved against the strain acting at the level of the light-metal plate and which has a tendency to change the miter angle.


SUMMARY

The situation is different when it comes to continuous loads, or to impact loads or alternating loads whose load vector runs perpendicularly to the surface of the light-metal plate, particularly inside the miter plane, wherein the light-metal hollow profiles hit against the corners of the air cargo pallet. Such forces can be of different magnitudes oriented in the same direction or can be oriented in opposite directions. Such forces can loosen the rivet connections between the light-metal hollow profiles and the light-metal plate and even bend the light-metal plate out of shape.
In order to counteract the shearing forces, in the known air cargo pallets the light-metal hollow profiles are connected by welding at their miter joints, which requires the use of qualified welders. This kind of operation is time-consuming and expensive.
In the areas to be welded the hollow profiles are deanodized, so that a perfect welding is possible. This procedure also increases the cost of pallets with welded corners.
Also because of irregular welding the weld joint can break. The repair of such damage is expensive, since the weld seam has to be undone, subjected to rough grinding and

REFERENCES:
patent: 1772732 (1930-08-01), Romine
patent: 1836885 (1931-12-01), Stuebing
patent: 3509832 (1970-05-01), Daisley
patent: 4046347 (1977-09-01), Bryan

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