Stock material or miscellaneous articles – Hollow or container type article – Cellular material derived from plant or animal source
Patent
1983-07-14
1984-11-13
Van Balen, William J.
Stock material or miscellaneous articles
Hollow or container type article
Cellular material derived from plant or animal source
523097, 220902, 296 31P, 428159, 428167, 428172, 4283191, B32B 302, B32B 102, B32B 1508
Patent
active
044825897
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE TO PRIOR CASES
This case stems from PCT/SE82/00409 filed Dec. 1, 1982 claiming priority from Swedish application 81/07409-8 filed Dec. 10, 1981.
TECHNICAL FIELD
The present invention relates to self carrying platforms forming a closed goods receiving space, preferably for refrigerator and/or freezer trailers, where the platform comprises a multi-layer or laminated structure of the "sandwich" type.
THE STATE OF THE ART
There are previously known platforms consisting substantially entirely of plastics material, for example from U.S. Pat. No. 3,003,810. Such platforms, however, do not meet the requirements of strength--in spite of the presence of reinforcing plates of "Plywood"--wear resistance and long term characteristics, such as water vapor impermeability. Said plastic/"Plywood" platforms may also include attachment devices, for instance, of the metal plate type, for the mounting of wheel shafts.
There are also known a number of other type of non-self-supporting "sandwich" structures, some having surface layers of metal. For instance, U.S. Pat. No. 3,481,642 shows an arrangement using supporting beams comprising outer layers of metal profiles and a core of PVC. The Swedish specification No. 307 079 deals with a structure based on a polyurethane core having outer layers of metal plate. The German AS No. 1 238 349 generally relates to "sandwich" platforms having through-going anchoring members. German OS No. 2 712 977 teaches a "corrugation"-technique quite useless in self carrying structures, especially as the corrugations are vertical ones. French Pat. No. 1 414 949 shows a type of platform comprising a large number of reinforcing elements. French Pat. No. 1 469 545 relates to an insulating tank where merely the inner container is reinforced by longitudinal beams. The British Pat. No. 941 905 describes a steel tank which is thermally insulated and supported in a cradle.
TECHNICAL PROBLEM
The problem behind the present invention is to improve the "sandwich" technique within the actual field and eliminate the said drawbacks and offer a self carrying structure being at an optimum from all points of view.
Additionally, the problem is to achieve an improved attachment of the wheel shaft(-s) of the platform and/or a framing of the platform, in the latter case being of the "demountable body" type, by using at an optimum the advantages of the sandwich-structure.
SOLUTION
The invention provides a self carrying platform forming a closed goods accomodating space, where at least the bottom of the goods accomodating space comprises a core of constructional cellular plastics on PVC-basis having a density in the range of 60 to 100 kg/m.sup.3, preferably 80 kg/m.sup.3, and where on both sides thereof the core is covered by metal plates attached to said sides.
A constructional plastics of the type mentioned has "closed cells" that maintain the "closed" configuration thereof for an unlimited time, at least from a practical point of view.
Preferably, there is arranged a mounting plate for plates) for at least one wheel shaft. The plate is adhesively attached to the core and located close to and symmetrically relative the centre line of the platform.
The mounting plate is insertable with advantage into a recess in the core between the lower surface layer and the core, and holes are formed in the mounting plate for the attachment of the wheel shaft arrangement.
Preferably, the attachment is obtained by bolt joints applied in said holes.
The attachment plate preferably is a four sided frame and is attached to the core as well as the surface layer.
A polyuerthane glue may be used for the adhesive attachment.
In the embodiment where a framing is arranged for the platform, preferably a framing for a so called "demountable body", such framing is attached to at least one mounting plate adhesively bonded to the core.
Such plate preferably comprises several metal strips extending generally parallel to and symmetrically relative the centre line of the platform/body.
The strips may be placed in recesses in
REFERENCES:
patent: 3003810 (1961-10-01), Kloote et al.
patent: 3924039 (1975-12-01), Smith, Jr.
patent: 4032680 (1977-06-01), Allard
patent: 4376494 (1983-03-01), Bjurling
Additainer AB
Van Balen William J.
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