Static structures (e.g. – buildings) – Facer held by stiffener-type frame – Facer attached between exposed frame members
Patent
1989-05-23
1995-05-02
Friedman, Carl D.
Static structures (e.g., buildings)
Facer held by stiffener-type frame
Facer attached between exposed frame members
5250607, E06B 354
Patent
active
054108535
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a ceiling lining of metal, consisting of a supporting grid and of cassettes arranged in the grid compartments of the supporting grid which is composed of longitudinal struts and of transverse struts connected to said longitudinal struts, each longitudinal strut and each transverse strut having substantially horizontal projections which are arranged on either side at the lower ends of said struts, extend in the longitudinal directions thereof, and are provided on their top sides with seals, upon which sealingly lie the cassettes.
In gas-tight ceiling linings such as are used above all in the clinical field, in laboratories, or in manufacturing facilities which are super-purity rooms, it is required that the supporting grid is designed in such manner that the cassettes are not only in a completely tightly sealing contact with the supporting grid, but can also be readily mounted and dismounted. Further, such ceiling linings must meet high optical requirements, i.e. particularly in ceiling linings which have a very large surface an exact arrangement of the cassettes must be possible.
From West German Patent 26 24 956 there is known a suspended ceiling in which the seals are arranged at the projections of the struts in such manner that the cassettes come to lie immediately upon the seals. This, however, has the disadvantage that the seals are fully loaded by the weight of the cassettes and thus very strongly compressed. Therefore, due to the elasticity of the seals, the cassettes do not rest in the grid evenly enough that the ceiling facing would completely meet the high optical requirements. Further, due to the immediate surface contact, it cannot be guaranteed that the cassettes are everywhere tight and sealed off.
The present invention is based upon the problem to provide a ceiling lining of the above mentioned kind, which is of simple structure, stable, optically pleasant and gas-tight, with variable grid sizes, and in which the cassettes can be easily mounted and dismounted.
According to the present invention, this problem is solved in that on the top side of the projection there is arranged a web which extends upward and along said projection and upon which rests the cassette.
The ceiling lining according to the invention is characterized by a number of significant advantages. Thus, according to the invention it is possible to place the cassettes immediately upon the webs of the supporting grid, whereby on the one hand an even and safe support of the cassettes is ensured, and on the other hand an exact alignment between the cassettes and the supporting grid which also meets the optical requirements can be achieved. Another essential advantage of the present invention resides in that, contrary to the prior art, the weight of the cassettes does not rest immediately upon the seals but is carried by the webs, while the seals are only in contact with the respective surfaces of the cassettes in order to provide for a gas-tight sealing. Thus, damaging of the seals can be avoided. Further, since the cassettes always completely rest upon the respective webs, it is also ensured that the seals are in engagement along the entire circumference of the cassettes so that a gas-tight sealing is guaranteed.
In a preferred embodiment of the invention the seal is disposed between the web and the side wall of the longitudinal strut and of the transverse strut respectively. Thus, even when the cassette is dismounted, the seal is protected against damaging, and in particular the seal is not visible when the cassette is in the assembled condition, whereby the optical impression as a whole is not impaired.
In order to obtain a good and uniform sealing effect, it may prove advantageous to design the seal tube-like and to provide it with a height which, in the unloaded condition, is larger than the height of the web. Thus, the seal is deformed by the cassette to a predetermined extent, and due to the elasticity of the seal a contact with the surface of the cassette can be obtained to an extent which
REFERENCES:
patent: 2882561 (1959-04-01), Schrode
patent: 3367077 (1968-02-01), Johnston
patent: 4744188 (1988-05-01), Ahren
patent: 5117587 (1992-06-01), Doan
Friedman Carl D.
Hartleif Metalldecken GmbH
Smith Creighton
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