Seal for a joint or juncture – Seal between fixed parts or static contact against... – Contact seal for other than internal combustion engine – or...
Patent
1993-12-15
2000-08-22
DePumpo, Daniel G.
Seal for a joint or juncture
Seal between fixed parts or static contact against...
Contact seal for other than internal combustion engine, or...
277638, 277648, 277650, 5271703, 52204591, E04B 166
Patent
active
061059730
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to joint seal gaskets.
The sealing gaskets of the invention may be employed in a number of environments to provide a seal between joints, for example, to provide a seal between ceiling and wall panels, or as a glazing gasket to provide a seal between a window pane and an adjacent mounting structure.
The invention is particularly described by reference to glazing gaskets.
BACKGROUND ART
Glazing requirements have changed radically in recent years. In particular, modern commercial buildings and multi-dwelling buildings employ large glass panes and curtain walls.
The development of the curtain wall in the 1940's produced new requirements in glazing technology.
A curtain wall is essentially non-load bearing, carries its own weight, is usually hung from the super-structure and is subject to structural movement.
Glazing materials employed in such structures must be able to accommodate structural movements of mechanical origin developed by the wind, and thermal origin developed by expansion and contraction of the frame structure.
So-called "wet" glazing systems have been widely employed which comprise an elongated mass of tacky mastic material which is temporarily supported on an elongated strip of paper. The mastic material adheres to the window pane and to the window mounting structure and provides an effective, water-tight seal. On the other hand, the flowable nature of the mastic causes it to flow out onto the window pane in streaks, in response to structural movements which exert pressure on it. These streaks are unsightly and interfere with the clear view otherwise provided by the window pane.
In addition when streaking occurs on the outer window pane surfaces, rain washes the streaked mastic from the pane and onto the adjacent building structures, producing an overall deterioration in the appearance of the building.
More recently, so-called "dry" glazing has been developed which employs an extruded resilient is gasket, for example, a rubber gasket. These resilient gaskets do not exhibit streaking and produce a uniform edge around the pane which is more aesthetic in appearance than the edge produced by the mastic. The resilient gaskets are also easier to install.
Rubber gaskets provide a long-lasting weathertight seal but the sealing action is less effective than that of the mastic, which can flow into the surface irregularities of the frame structure. Consequently the "wet" glazing system has remained in wide spread use in spite of its inherent disadvantages.
DISCLOSURE OF THE INVENTION
The present invention seeks to provide a gasket which overcomes the disadvantages of the prior systems in the glazing field, but which is also suitable for non-glazing, joint sealing applications.
Essentially the present invention provides a composite joint sealing gasket comprising an elongated flexible, resilient member with opposed elongated upper and lower longitudinal edge portions. The upper portion has a resiliently deformable sealing element. A viscous, flowable, tacky sealing composition is supported on an outer surface of the lower portion remote from the sealing element.
The resilient member is, in particular, a self-supporting, shaped, extruded elastomer member of synthetic rubber or rubber-like material, for example, ethylene-propylene terpolymer (EPDM), neoprene (polychloroprene), styrene-butadiene rubber, nitrile rubbers and silicone rubbers. However, other polymer materials, for example, polyvinyl chloride may also be employed provided they have the requisite physical characteristics.
The flowable sealing composition may, for example, be a mastic composition of the type well known in the glazing field. Mastic compositions are tacky, self-adherent and flowable and will flow into surface irregularities producing a good seal. Mastic compositions adhere tenaciously to most surfaces, are of high viscosity and will flow under pressure if they are not physically confined.
The sealing composition is supported on the lower portion remote from the upper portion such that in
REFERENCES:
patent: 3076777 (1963-02-01), Zeolla et al.
patent: 3388517 (1968-06-01), Wohl et al.
patent: 3436891 (1969-04-01), Church
patent: 3456408 (1969-07-01), Zahn
patent: 3881290 (1975-05-01), Bouchey
patent: 4409283 (1983-10-01), Boyle, Jr.
patent: 4612743 (1986-09-01), Salzer
patent: 4889574 (1989-12-01), Furman
patent: 4939879 (1990-07-01), Gold
Butler Donald James
Dos Reis Henrique Manuel Costa
Jefferies Murray Charles
DePumpo Daniel G.
Tremco Ltd.
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