Method of forming spark plug boots

Details Method of forming spark plug boots Method of forming spark plug boots

1984-03-05

1985-11-05

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Forming continuous work followed by cutting

264526, 264531, 264230, 264236, 264294, 264DIG59, 4253261, 4253871, 425393, B29H 501

Patent

active

045512930

ABSTRACT:
A method of forming a spark plug boot which utilizes an extrusion process. An elastomeric tube is extruded, then heated to a partially cured condition. The tube is then cut into individual pieces. The individual pieces are stretched over a pin which has at least one external shoulder. The pin and tube are then heated to a temperature and for a time to provide a final cure. The tube is stripped from the pin. The compression set and shrinkage results in an internal shoulder in the tube, allowing it to serve as a spark plug boot.

REFERENCES:
patent: 1724354 (1929-08-01), Kraft
patent: 2301686 (1942-11-01), Doran
patent: 2355443 (1944-08-01), Jeffery
patent: 2671889 (1954-03-01), Vickery
patent: 2782459 (1957-02-01), Moncrieff
patent: 3063100 (1962-11-01), Kohring
patent: 3205290 (1965-09-01), Covington, Jr. et al.
patent: 3714311 (1973-01-01), Stefanka
patent: 3972548 (1976-08-01), Roseen
patent: 4061704 (1977-12-01), Barter

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