Static structures (e.g. – buildings) – Machine or implement
Patent
1993-06-25
1995-03-21
Friedman, Carl D.
Static structures (e.g., buildings)
Machine or implement
182 93, E04C 530
Patent
active
053984773
DESCRIPTION:
BRIEF SUMMARY
GROUNDS OF THE INVENTION
The patent invention relates to a shaft article made from molding material.
Shaft elements of the above-mentioned general type are known in the art, for example in the patent document GB-A-209 931. These shaft elements have a uniform wall thickness over their circumference and one-piece supports which are formed as substantially gallery-like inwardly extending projections. On a plane view, the projections have substantially the shape of a hollow basin. Such projections are difficult to make during the manufacture. They are also subjected to loads and can be easily broken.
The patent document JP-U-54 20 846 discloses a finished molding which is provided inwardly on the wall with two wall thickenings extending at a distance from one another. They are arranged so that subsequently the ends of special rods can be inserted and fixed by securing elements. These special rods form the supports.
The patent document U.S. Pat. No. 3,745,738 shows shaft elements which are provided inwardly with a separate element composed for example of polyester material and having openings so as to form a conductor. This separate element is mounted on the shaft element.
Such shaft elements are also known from DE-PS 31 10 185. They have in their interior at least one support on which a person can step. The support is formed by a step iron which is molded in along with the finished molded article with the aid of a special installing device as part of the mold device during the production and molding of the finished molded article. For example, if the finished molded article includes a manhole element or shaft element, e.g. a shaft ring, made from concrete, the step irons are embedded in the concrete from the inside during the molding process. These step irons must be acquired at a particularly high cost, stored and loaded, fed to the mold device during the molding process and placed. This is involved and expensive. There is also a risk of corrosion, depending on the material from which the step irons are formed. For this reason, shafts designed in this way bring about increased maintenance and inspection costs. Iron step irons involve the risk of spark formation and thus the danger of explosions in shafts containing highly flammable or explosive media. Since the step irons are often smooth and generally slippery in the interior of the shaft, the danger of slipping when climbing them is not entirely excluded. Another disadvantage with respect to manufacture consists in the wide range of shapes and dimensions of commercially available step irons. For this reason alone, the mold devices for the production of the finished molded articles must be adapted to a great number of different designs of step irons. Consequently, it is necessary to provide correspondingly adapted mold devices, which is extremely costly.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a shaft element which avoids the disadvantages of the prior art.
More particularly, it is an object of the present invention to provide a shaft element which dispenses with separate step irons without sacrificing strength and leads to a reduction in cost.
In keeping with these objects and with others that will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a shaft article made from molding material provided in its interior with at least one support on which a person can step and which is an integral part of the shaft element made from the molding material, wherein in accordance with the present invention the respective support is constructed in the region of a thickened wall portion or at or in an internal intermediate wall of the shaft element.
Separate step irons as independent elements to be integrally molded during the molding process are completely dispensed with in that at least one support forms an integral component part with the manhole or shaft element and is molded along with the shaft element from the molding material of the latter during the molding process
REFERENCES:
patent: 994133 (1911-06-01), De Jonge
patent: 3745738 (1973-07-01), Singer
patent: 4328880 (1982-05-01), Lapeyre
Patent Abstracts of Japan, vol. 7, No. 209 (C-186) (1354), 14 Sep. 1983 & JP,A,58109568 (Asahi Kasei Kogyo K.K.), 29 Jun. 1983.
Database WPIL, Accession No. 86-114758 [18], & ES,A,8601283 (Sanchez J C), 16 Feb. 1982.
Kraiss Richard
Philipp Peter
Friedman Carl D.
Georg Prinzing GmbH & Co. KG Betonformen-und Maschinenfabrik
Smith Creighton
Striker Michael J.
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