Patent ID: 9599141
Date: 2017-03-21
CPC Classifications: B64D,F16B

Claim:
1. A cap for forming a sealed cavity around one end of a fastener, the cap comprising an inner cap member with a base terminating at an edge which surrounds an opening into a central cavity; an outer cap member which fits over the inner cap member and has a base; wherein either: the inner cap member has side walls with a uniform wall thickness around an entire circumference of the inner cap member and a plurality of channels formed in an outer surface of the inner cap member and a plurality of corresponding ridges formed in an inner surface of the inner cap member, the channels and the ridges extending longitudinally along a substantial portion of the inner cap member; or the outer cap member has side walls with a substantially uniform wall thickness and a plurality of channels formed in an inner surface of the outer cap member and a corresponding plurality of ridges formed in an outer surface of the outer cap member, the channels and the ridges extending longitudinally along a substantial portion of the outer cap member.