1978-05-12
1979-05-15
Bonck, Rodney H.
85 9R, 85 54, F16B 2300
Patent
active
041541383
ABSTRACT:
A screw includes a metal portion having a threaded shank adapted to be threaded into a workpiece, a head and an annular flange between the head and the shank. The surface of the metal head and the upper surface of the metal flange are irregular so that, when a plastic portion is molded around the head and flange of the metal portion, the metal and plastic portions are relatively fixed to each other. The plastic portion includes a thin skirt which extends around the periphery of the flange and further includes a thin radially extending section which mates with an annular rib extending around the periphery of the underside of the flange to reduce the possibility of failure of the plastic portion as that portion is forced against a workpiece. The section of the plastic portion extending radially under the flange is formed with depending rings which deform and form a seal as the fastener is threaded down to bring the radially extending section toward engagement with the workpiece.
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patent: 3803972 (1974-04-01), Deutsher
patent: 3897712 (1975-08-01), Black
Bonck Rodney H.
Elco Industries, Inc.
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