Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Cap over the head
Patent
1991-03-22
1992-06-16
Lindsey, Rodney M.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Headed fastener element with nut, washer, securing means or cap
Cap over the head
411369, F16B 1900
Patent
active
051220210
ABSTRACT:
A threaded fastener is provided with a plastic head section that is interlocked with a metal head end of a metal body having an elongated shank with a thread thereon. The plastic head is polygonal with a higher concentration of a reinforcing filler material such as glass in the outer periphery of the polygon so that the plastic head can be turned with the usual wrenches at a normal turning torque without rounding off of the polygonal corners of the head. The inner section of the plastic head has a lesser concentration of filler material adjacent the juncture of plastic and the metal head end to provide greater ductility and strength resistance to fracture or separation of the plastic from the metal head end. The preferred fastener has a self-tapping, helical screw thread thereon and a plurality of metal washers for receiving and separating electrical conductors that will be attached to the fastener between adjacent washers. The edges of the washers are also coated with plastic having a lesser concentration of the filler material thereby providing greater ductility and more resistance to cracking or chipping of the plastic from the washer edges. The preferred plastic is nylon. A method of molding the plastic with the filler material in a plastics mold is disclosed.
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Lindsey Rodney M.
The Fastron Corporation
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