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US 4,790,544 AGranted
Expansible seal
AssigneeRaychem Corporation
InventorChristian F. Kemp
Life of this patent
Estimating the term…
Abstract
A seal in an aperture, e.g., a duct, is made by foaming a foamable substrate within an envelope in the aperture, to expand the envelope, which desirably has sealant or adhesive on its outer surface, to conform it into sealing engagement with the aperture. The envelope is closed and is of wraparound configuration so as to seal a large variety of aperture sizes, whether empty or containing objects, such as cables.
Claims13
A method of sealing a duct comprising:
- (a) selecting an envelope having a plurality of perforations on at least a portion of the outer surface thereof and a sealant over at least a portion of said outer surface;
- (b) inserting the envelope into the duct;
- (c) wrapping the envelope over on to itself with the outer surface thereof being positioned to face the interior wall of the duct;
- (d) introducing a curable foamable material into the envelope;
- and
- (e) allowing the foamable material to foam thereby causing the outer surface of the envelope to come into sealing engagement with the interior wall of the duct, such sealing being enhanced by a small proportion of said foamable material forced through said perforations.
3 more elements
A method of sealing a duct having a cable extending therethrough, which method comprises:
- (a) selecting an envelope having an inner and an outer surface and having a plurality of perforations on at least a portion of the outer surface and a sealant over at least a portion of the outer surface;
- (b) inserting the envelope into the duct;
- (c) wrapping the envelope around the cable and over on to itself with the outer surface thereof being positioned to face the interior wall of the duct;
- (d) introducing a curable foamable material into the envelope;
- and
- (e) allowing the foamable material to foam thereby causing the outer surface of the envelope to come into sealing engagement with the interior wall of the duct, such sealing being enhanced by a small proportion of said foamable material forced through said perforations, and causing the inner surface of the envelope to seal to the cable.
3 more elements
An assembly for sealing a duct comprising:
- (a) an envelope having an opening therein for receiving a curable foamable material for expanding the envelope, a plurality of perforations on at least a portion of the outer surface thereof and a sealant over at least a portion of said outer surface;
- said envelope being arranged to be wrapped on to itself for insertion into a duct;
- (b) a container containing said foamable material;
- and
- (c) means arranged to connect the container to the envelope to conduct the foamable material thereto for effecting expansion of the envelope so that the outer surface thereof seals to the duct, such sealing being enhanced by a small proportion of said foamable material forced through said perforations.
2 more elements
Dependencies are inferred from the claim text.