Plastic and nonmetallic article shaping or treating: processes – Forming structural installations in situ – Arched – domed – or vertical-cylindrical structure
Patent
1995-04-10
1997-01-14
Mackey, James P.
Plastic and nonmetallic article shaping or treating: processes
Forming structural installations in situ
Arched, domed, or vertical-cylindrical structure
249 48, 249 51, 264313, 405233, 405243, E04G 1302, E02D 534
Patent
active
055936237
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION AND PRIOR ART
The present invention relates to a casting mould for keeping the cast compound together and supporting it on casting elongated objects standing on an underlayer and extending vertically.
Elongated objects extending vertically and having shapes, uses and cast compound material within very broad ranges of variations may be concerned. Although the particular case of casting columns for buildings, especially plinths for houses and the like, with concrete as cast compound and the particular problems arising thereby, will be described hereinafter, this is not at all to be interpreted as any limitation of the invention but only as an example for explanation thereof.
Rigid tubes, usually cardboard tubes, are used as casting moulds in casting different types of columns for building purposes, and in particular in casting plinths for houses, cottages and the like. These tubes are often provided in certain lengths, for instance 2.5 m, and they are therefor to be bought in these lengths and after that be cut into the length suitable for the casting in question, which results in a considerable waste of such cardboard tubes. Another disadvantage of the use of such tubes as casting moulds consists in that they are bulky and demand a considerable space--both in the building product shop or a similar sales location providing them and in the vehicles to be used to transport them to a place for their use.
BRIEF DESCRIPTION OF THE INVENTION
The object of the present invention is to provide a casting mould of the type defined in the introduction, which finds a remedy to the inconveniences mentioned above and associated with prior casting moulds for casting objects of the type in question.
This object is, in accordance with the present invention, obtained by providing a casting mould comprising a flexible elongated envelope which is substantially inelastic and having an opening at one end thereof for supplying cast compound, i.e. the casting material, e.g. concrete, said envelope being arranged to be held substantially vertically while being stretched by cast compound introduced through said opening so as to form a casting mould having a circular cross-section, extending vertically and supporting and keeping the cast compound together.
Thus, the invention is based on the understanding of the very surprising phenomenon, that a flexible elongated envelope being substantially inelastic and which may be stretched to assume a circular cross-section could keep the cast compound together and at the same time give the support required for assuming and maintaining a vertical extension during the hardening of the cast compound, even though the envelope does not have to have any kind of consistency alone. However, it has in practise turned out that the use of such an envelope as a casting mould functions excellently. Thus, the mutual co-operation between the cast compound and the casting mould consisting of the envelope takes place by using the gravitation of the cast compound for keeping the casting mould perpendicular, so that the latter assumes a shape and an extension for keeping the cast compound in a determined shape during the hardening or solidification thereof. Thus, thanks to the invention, it is possible to provide casting moulds demanding a neglectable space with respect to what previously was the case in storage and transport, since they may be stored flat so as to assume the casting mould shape thereof while being stretched at the occasion of the very casting. Elongated webs, which are preferably wound on rolls, from which casting moulds of exactly the lengths desired may be separated, may advantageously be provided, so that no waste is produced any longer. Accordingly, for instance a carpenter may in this way carry casting moulds of a very considerable total length along, for example 20 meters plinth moulds, and this length may be carefully adjusted to the requirements of casting moulds at the building location in question, but it would of course also be possible that he carries consi
REFERENCES:
patent: 3496729 (1970-02-01), Pleuger
patent: 3726950 (1973-04-01), Turzillo
patent: 4096944 (1978-06-01), Simpson
Patent Abstracts of Japan, vol. 12, No. 64, M-672, abstract of JP, A, 62-211420 (ASAHI CHEM IND CO LTD), 17 Sep. 1987.
Patent Abstracts of Japan, vol. 13, No. 214, M-827, abstract of JP, A, 1-33315 (ASAHI CHEM IND CO LTD), 3 Feb. 1989.
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