Captive type sparkplug gasket

Details Captive type sparkplug gasket Captive type sparkplug gasket

1975-05-23

1976-04-06

Smith, Robert I.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 11, 277166, F16J 1508

Patent

active

039485323

ABSTRACT:
A captive spark plug gasket in which the means for maintaining the captive relation is in the form of an inwardly directed flange, the free edge of which is provided with a plurality of staked undulations to provide the equivalent of metal which is appreciably thicker than the original thickness of the metal stock from which the gasket is formed. During a staking operation, the inwardly directed flange is inwardly folded to reduce the effective diameter of the free edge thereof, so as to be positioned to lie upon the unthreaded undercut area adjacent the lower transverse surface of the plug body. Because of the increased thickness of the free edge of the inwardly folded flange, cross threading with respect to the thread on the shank does not occur when the plug is unthreaded from an engaged cylinder head opening, and the gasket remains captive on removal.

REFERENCES:
patent: 3099456 (1963-07-01), Hopp

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