Unified head for a stacked fastener

Abstract

A unified head for a staked fastener wherein the unified head is made from a first member in combination with a supplemental member, and the two members have at least one shared fiber. In a staking operation that forms the unified head, the operation is conducted in such a manner that a portion of a fiber, initially within the first member or the supplemental member, crosses the boundary therebetween creating the shared fiber, i.e., a segment of a single fiber is embedded in the first member and a segment is embedded in the supplemental member.

1 . A method of making a rivet:
 providing a shank having an initial head,   passing the shank through a body, thereby defining on the shank a gripping portion and a clinching portion,   placing a supplemental member having at least one fiber therein proximate the clinching portion and the body, and   staking the clinching portion and the supplemental member creating a unified head.   
     
     
         2 . A method of staking a clinch portion of a fastener comprising the steps of:
 providing a clinch portion,   providing a supplemental member,   staking the clinch portion into the supplemental member creating a pre-head, wherein the staking includes a fixing step.   
     
     
         3 . The method of  claim 2  wherein in the step of staking, the fixing employs an ultrasonic method.