Receptacles – Freight containers
Patent
1981-11-06
1983-11-22
Price, William
Receptacles
Freight containers
220 181, 220 701, 220 71, 220 721, B65D 8806
Patent
active
044163843
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a tank container comprising a framework and a tank disposed therein.
BACKGROUND ART
The tank in such a container must somehow be secured in the framework so that all the forces which occur can be transmitted, and it should be noted that these forces may be considerable with rough handling of a full container.
The most common type of securing is based on saddles or the like in the framework, in which the tank rests or is fixed. These saddles may be supplemented by rods or the like for transmission of axial forces.
Another solution to the securing problem is shown in Swedish Patent No. 326 664, where the cantilevered tank is fixed by means of cylindrical extensions of the tank shell secured in the end frames.
All the known securing devices suffer from various disadvantages, of which high consumption of material, great weight and high price may be mentioned. A fundamental disadvantage is that the securing members (for example saddles) transmit forces to the tank obiquely or at right angles to the tank wall, which is exposed to a greater or lesser bending moment as a result and therefore has to be dimensioned accordingly with consequent high weight and costs.
THE INVENTION
The said disadvantages are according to the invention overcome in that members for transmitting forces in their longitudinal direction are disposed between the framework and the tank in the axial and radial direction of the tank wall, so that the forces between the tank and the framework are transmitted substantially without any bending moment on the tank wall.
These members may be directed in various ways, but in view of the fact that all the forces acting on the tank are axial and radial or can be divided up into such components, it is advisable to provide separate members for axial and radial forces respectively.
In a preferred embodiment this is brought about in such a manner that suspension plates extend radially from the respective end of the tank to the end frames of the framework for the transmission of radial forces and that fastening plates extend axially from the cylindrical portion of the tank to the respective end frame for the transmission of axial forces.
These suspension plates for the radial forces are pliable in the axial direction and therefore cannot transmit axial forces and thus cannot cause harmful bending moments in their securing means in the tank. The same reasoning applies to the axial fastening plates.
Before the tank is mounted in the framework, the tank attachment (with cams for cooperation with the fastening plates) and the suspension plates are welded firmly so that stress-relieving or the like can be carried out without the framework and that the assembly welding can take place without the heat treatment being endangered.
The number of suspension plates or fastening plates at each end of the tank is preferably four, and these plates extend between the tank and the end frame at the four corners.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in more detail below with reference to the accompanying drawings, in which
FIGS. 1 and 2 are side views of a tank container according to the invention with and without framework respectively,
FIGS. 3 and 4 are end views of the same tank container with and without framework respectively,
FIG. 5 is a section along the line V--V in FIG. 1,
FIG. 6 is a section along line VI--VI in FIG. 5, and
FIG. 7 is a partial section along the line VII--VII in FIG. 1, FIGS. 5-7 being on a larger scale than FIGS. 1-4.
DESCRIPTION OF A PREFERRED EMBODIMENT
A welded-together framework for a tank container consists, in a manner well known to the man skilled in the art, of two end frames 1 (in this case with a somewhat different shape than usual), a bottom frame 2 comprising for example two profiles between the end frames 1, and a sun screen 3 with a design described in more detail below.
This framework preferably has the external dimensions standardized for a container and is provided with corner boxes 4 in its cor
REFERENCES:
patent: 2477831 (1949-08-01), Schmitz, Jr.
patent: 2592974 (1952-04-01), Sulfrian
patent: 3726431 (1973-04-01), Botkin
patent: 4060174 (1977-11-01), Gerhard
Brown Laurence R.
Dynatrans AB
Elkins Gary E.
Price William
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