Seal for a joint or juncture – Seal between fixed parts or static contact against... – Contact seal for a pipe – conduit – or cable
Patent
1997-11-03
1999-03-02
DePumpo, Daniel G.
Seal for a joint or juncture
Seal between fixed parts or static contact against...
Contact seal for a pipe, conduit, or cable
277602, 277931, 277936, 52232, F16J 1500
Patent
active
058760423
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
1.0. Field of the Invention
This invention relates generally to pipe sealing devices, and more particularly to such devices including heat activated sealing mechanisms for sealing the gap between a pipe and its passage through a wall.
2.0 Discussion of Related Art
A pipe seal of the type in question is used to protect openings or channels in walls or ceilings where pipes pass through. The pipes are generally made of thermoplastics, more particularly polyvinyl chloride, polyethylene and polypropylene, and are generally circular in cross-section, pipes with external diameters of 32 to 400 mm mainly being used in the construction industry.
A pipe seal with very good fire-proof properties is described in applicants' DE 39 30 722 A1. However, it is inconvenient for some applications and entails preassembly of its components in accordance with the particular pipe diameter.
EP 0 486 299 A1 describes a bendable sheet-metal sleeve or a sheet-metal casing provided on its inside with a layer of mouldable swelling compound. In addition, a strip of plastic swelling compound may be associated with this layer to ensure that the metal casing with the swelling compound fits tightly around the pipe.
In a known modification of this construction, the inside of the metal casing is coated solely with a viscous paste of swelling compound.
Finally, it is known that pipes or cables in wall channels can be wrapped in endless tapes of narrow strips of solid swelling compound based on waterglass which are welded between two films and which can be wrapped around the pipes or cables to be protected in one or more laps. The laps are held together by the brickwork surrounding them.
SUMMARY OF THE INVENTION
The problem addressed by the invention is to provide a pipe seal that is simple and inexpensive to make, easy to assemble and, at the same time, quick and effective in reacting to heat.
The invention is characterized in that projections containing swelling compound are associated at intervals from one another about the inside face of the sheet-metal casing. The intervals separating the projections containing swelling compound from one another are advantageous in several respects. They facilitate assembly and provide for rapid and substantially uniform heating of the swelling compound in the event of fire so that it is able to expand rapidly, compressing the pipe and sealing the opening formed. In addition, swelling compound can be saved. Good swelling compounds, which are preferably used, have an expansion capacity of 1:10 or more. By contrast, in known pipe seals with the space-filling quantities of swelling compound, considerably more swelling compound than necessary is used.
The projections on the inside of the sheet-metal casing are best present in only one position and preferably have the same radial height. They may advantageously be in the form of radial spacers between the sheet-metal casing and the pipe. After assembly, therefore, they are in mechanical and thermal contact with the tube they enclose. The projections are preferably permanently connected to the sheet-metal casing which provides for easy assembly. The intervals between the projections are best large enough to enable the sheet-metal casing even to be bent around pipes with a small external diameter without the projections interfering with one another.
In one preferred embodiment, the projections are provided on a holding substrate for the projections of swelling compound, more particularly on a film, from the bottom surface from which they project preferably on one side. The use of a film provides for simple production and alignment of the projections of swelling compound with fixed intervals inbetween. Instead of a film, open holding substrates, such as nets or gauzes, may be provided for the alignment of the projections, particularly where they consist of large pieces of swelling compound. In one particularly preferred embodiment, the bottom surface of the film is in contact with and preferably joined to the inside wall of the sheet-metal casing.
REFERENCES:
patent: 4850385 (1989-07-01), Harbeke
patent: 4901488 (1990-02-01), Murota et al.
patent: 4951442 (1990-08-01), Harbeke, Jr.
patent: 5103609 (1992-04-01), Thoreson et al.
Annemaier Dieter
Graf Robert
DePumpo Daniel G.
Gruenau Illertissen GmbH
Jaeschke Wayne C.
Szoke Ernest G.
Watov Kenneth
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