Cap with channels for forming a sealed cavity around fastener

A method of installing a cap to form a sealed cavity around one end of a fastener, the fastener passing through a structure, 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;
• and a sealant material between the inner cap member and the outer cap member, wherein either:
• the inner cap member has a number of channels formed in an outer surface of the inner cap member and a number of corresponding ridges formed in an inner surface of the inner cap member, the number of channels being the same as the number of corresponding ridges, the channels and the ridges extending longitudinally along a substantial portion of the inner cap member;
• or the outer cap member has a number of channels formed in an inner surface of the outer cap member and a number of corresponding ridges formed in an outer surface of the outer cap member, the number of channels being the same as the number of corresponding ridges, the channels and the ridges extending longitudinally along a substantial portion of the outer cap member, said method comprising the steps of:
• (a) fitting the cap over one end of the fastener so that the end of the fastener is enclosed by the inner cap member and a plurality of channels are defined between the inner and outer cap members;
• (b) pushing the outer cap member towards the structure so that the sealant material flows substantially via the channels towards the structure so as to form a bead of sealant around the base of the cap;
• and (c) adhering the cap to the structure with the sealant material.

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 a corrugated shape forming a plurality of channels in an outer surface of the inner cap member and a plurality of corresponding ridges in an inner surface of the inner cap member;
• or the outer cap member has a corrugated shape forming a plurality of channels in an inner surface of the outer cap member and a corresponding plurality of ridges in an outer surface of the outer cap member.

A method of installing a cap to form a sealed cavity around one end of a fastener, the fastener passing through a structure, 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;
• and a sealant material between the inner cap member and the outer cap member, wherein either:
• the inner cap member has a corrugated shape forming a plurality of channels in an outer surface of the inner cap member and a plurality of corresponding ridges in an inner surface of the inner cap member;
• or the outer cap member has a corrugated shape forming a plurality of channels formed in an inner surface of the outer cap member and a corresponding plurality of ridges in an outer surface of the outer cap member, said method comprising the steps of:
• (a) fitting the cap over one end of the fastener so that the end of the fastener is enclosed by the inner cap member and a plurality of channels are defined between the inner and outer cap members;
• (b) pushing the outer cap member towards the structure so that the sealant material flows substantially via the channels towards the structure so as to form a bead of sealant around the base of the cap;
• and (c) adhering the cap to the structure with the sealant material.