Anti-rotation tacking rivet having ribs

A tacking fastener for fastening at least two work pieces together which have aligned apertures therethrough, said tacking fastener comprising:

• a stem having an elongated stem shank with an enlarged stem head which extends to an end of said elongated stem shank and gripping means which are provided at an opposite end of said elongated stem shank;
• and
• a tacking rivet having an opening therethrough, said tacking rivet including,
• a head portion which is configured to be positioned proximate to one of said at least two work pieces, said head portion further configured to be larger than said aligned apertures of said at least two workpieces,
• an elongated sleeve portion which extends from said head portion and through said aligned apertures of said at least two workpieces, said elongated sleeve portion, and
• a plurality of rib portions positioned on an outer surface of said elongated sleeve portion,
• said elongated stem shank extending within said opening of said tacking rivet such that said enlarged stem head is distal from said head portion of said tacking rivet and said gripping means is proximate to said head portion,
• said enlarged stem head being adapted to move into said opening of said tacking rivet to expand said elongated sleeve portion within the apertures of the work pieces to force said plurality of rib portions to engage with a wall of at least one of the apertures,
• said engagement of said plurality of rib portions with the wall of at least one of the apertures preventing rotation of said tacking rivet during a drilling operation to remove said tacking rivet from the apertures of the work pieces.

A method of attaching at least two work pieces together which have aligned apertures therethrough, said method comprising the steps of:

• a) providing a stem having an elongated stem shank with an enlarged stem head which extends to an end of said elongated stem shank and gripping means which are provided at an opposite end of said elongated stem shank;
• b) providing a temporary tacking rivet having an opening therethrough which includes a head portion, an elongated sleeve portion extending from said head portion, and a plurality of rib portions positioned on an outer surface of said elongated sleeve portion;
• c) inserting said elongated stem shank into and through said opening of said tacking rivet such that said enlarged stem head is positioned distal to said head portion and said gripping means is positioned proximate to said head portion;
• d) inserting said elongated sleeve portion into and through the apertures of the work pieces such that said head portion is positioned against a surface of one of the work pieces;
• e) applying an axial force to said stem to pull said enlarged stem head into said opening of said tacking rivet to expand said elongated sleeve portion within the apertures and to embed said plurality of rib portions into a wall of at least one of the apertures of the work pieces, thereby attaching the work pieces together;
• f) drilling said head portion, said elongated sleeve portion and the work pieces with a drill bit;
• g) inserting a permanent fastener into the apertures of the work pieces to permanently attach the work pieces together.