Patent ID: 7880112
Filing Date: 2011-02-01
Classification: B23K,F16B

Abstract:
1. A method for attaching a head of a fastener to an inside wall of a member having the inside wall and also having an outside wall, comprising; providing a fastener having a head and a threaded shank, the head having a plurality of fastener head portions that radiate from the threaded shank and are spaced circumferentially from one another, said fastener head portions each having at least one projection thereon and each of said fastener head portions also carrying a heat curable adhesive; making a shaped hole in the member; the shaped hole having a central portion shaped to receive the shank and a plurality of hole portions that radiate from the central portions and being shaped to closely receive a corresponding one of the plurality of head portions; providing a tool having a threaded stem surrounded by a sleeve that is engaged with the outside wall of the member and the tool having rotary and linear actuators for moving the threaded stem relative the sleeve; threadedly engaging the threaded stem of the tool with the threaded shank of the fastener so that rotary and linear movement of the threaded stem will move the fastener; operating the linear actuator of the tool to insert the head of the fastener into the shaped hole and then operating the rotary actuator of the tool to rotate the fastener so that the fastener head portions engage with the inside wall of the member and cannot be withdrawn from the shaped hole; and applying electric current of opposite polarity to the fastener and the member to bond the head to the inside wall of the member by electric resistance heating that cures the adhesive to create an adhesive bond and also creates an electric resistance weld between the projections of the fastener head portions and the inside wall of the member.