Patent ID: 6511274
Filing Date: 2003-01-28
Classification: F16B

Abstract:
A metal fastener member to be installed in a workpiece, wherein:said fastener member comprises a cylindrical shaft, a cap, and a frangible connecting region; said fastener member is made of a single metal material and has an initial state before being installed in the workpiece and a final state after being installed in the workpiece; said cylindrical shaft includes a flarable portion and a shaft body which are integral and continuous with one another in both said initial state and said final state; said flarable portion has a cylindrical shape and extends axially from said shaft body about a common central axis of said shaft body and said flarable portion in said initial state, and said flarable portion is flared radially outwardly from said shaft body in said final state; said cap is integrally and continuously connected by said frangible connecting region to said flarable portion at an end thereof opposite said shaft body and protrudes radially inwardly from said flarable portion in said initial state; said frangible connecting region is broken such that said cap is separated from said flarable portion through said broken frangible connecting region in said final state; and said frangible connecting region has such a shape in said initial state so that when a pressing force is applied to said cap portion directed toward said shaft body, then a reaction force is exerted to flare said flarable portion radially outwardly and to break said frangible connection region to separate said cap from said flarable portion.