Sealing washer
First Claim
1. An annular washer to provide a seal between the upper surface of an object into which a fastening device, having a shank passing through said washer, is inserted;
- said annular washer having a substantially flat region on the underside of an annular boss surrounding the center aperture through said washer, and having a peripheral downwardly, outwardly extending resiliently deformable tapered annular skirt, said tapered skirt having its rim located below said flat region and being joined to the periphery of said boss by a deformable annular diaphram.
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Accused Products
Abstract
The invention provides a washer having a deformable annular skirt extending from the underside of the washer. The skirt deforms to the shape of the surface to which the washer is secured by means of a fastening device having a shank passing through the washer. The resiliency of the skirt seals the cavity between the underside of the washer and the surface from moisture. The washer is particularly suitable for use with corrugated surfaces and for retaining the swarf produced by self drilling fastening devices. A snap-on cap for the washer is also provided to seal the head of the fastening device.
29 Citations
7 Claims
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1. An annular washer to provide a seal between the upper surface of an object into which a fastening device, having a shank passing through said washer, is inserted;
- said annular washer having a substantially flat region on the underside of an annular boss surrounding the center aperture through said washer, and having a peripheral downwardly, outwardly extending resiliently deformable tapered annular skirt, said tapered skirt having its rim located below said flat region and being joined to the periphery of said boss by a deformable annular diaphram.
- View Dependent Claims (2, 3, 4, 5, 6, 7)
Specification