Fastener assembly useful as drain plug

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Headed bolt or screw with threads and complementary nut

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Details

411533, 411542, 285220, 285918, F16B 3300, F16B 4302

Patent

active

051884950

ABSTRACT:
A fastener assembly comprises a metal screw and a sealing ring made from an elastomeric material and is useful, in an exemplary application, as a drain plug for an oil pan for an internal combustion engine. The screw head has an undercut, annular recess, within which the sealing ring is seated. The sealing ring has a sealing portion, which when unstressed has an axial thickness smaller than the recess depth, and an adjoining portion or web extending radially inwardly. When unstressed, the adjoining portion has an inner diameter smaller than the major diameter of the threaded portion of the screw shank. The sealing ring when unstressed has an outer diameter larger than the outer diameter of the recess. Moreover, the recess volume is sufficient for the recess to contain the sealing ring over a wide range of cumulative, dimensional tolerances.

REFERENCES:
patent: 3062557 (1962-11-01), Underwood
patent: 3399589 (1968-09-01), Breed
patent: 3726178 (1973-04-01), Dimitry
patent: 3746348 (1973-07-01), Stone
patent: 4531767 (1985-07-01), Andreolla
patent: 4701088 (1987-10-01), Crull
patent: 4702657 (1987-10-01), Jelinek

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