Captive type spark plug gasket and tool for installing same

Details Captive type spark plug gasket and tool for installing same Captive type spark plug gasket and tool for installing same

1975-07-08

1977-01-18

Jones, Jr., James L.

Metal working

Means to assemble or disassemble

Means comprising hand manipulatable tool

277 95, B25B 2714

Patent

active

040031209

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 folded upon itself 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 further inwardly folded to reduce the effective diameter of the free edge portion 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: 2669148 (1954-02-01), Fack
patent: 3099456 (1963-07-01), Hopp
patent: 3285632 (1966-11-01), Dunkle
patent: 3299504 (1967-01-01), Hopp
patent: 3529837 (1970-09-01), Eaton et al.

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