Title: Electrical igniters

Abstract: A surface-discharge igniter is formed by positioning a tubular assembly coaxially within the outer shell of a nose portion of the igniter. The assembly is welded about one end to form a seal with the outer shell, and glass material is placed within the assembly to form a seal with a central rod-shape electrode extending coaxially within the assembly. The assembly has an outer tube of the same material as the outer shell, and an inner tube which extends coaxially within the outer tube and which is of a different material, having a coefficient of thermal expansion substantially the same as that of the glass material. The inner tube is joined to the outer tube at an end remote from the seal with the outer shell. The nose portion forms the operative tip of the igniter and is welded to a rear body portion having screw threads for mounting the igniter and for making electrical connection to it.

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Inventors: Cooper, Ronald H. (Claygate, GB)
Goreham, Kenneth A. (London, GB)
Wakeford, Christopher B. (Twickenham, GB)

Application Number: 885246
Filing Date: 1978-03-10
Publication_date: 1980-01-08
Assignee: Smiths Industries Limited (London, GB2)
Primary Class(es): 445/7
Other Classes:
US Patent Ref:

1314129	Aug, 1919	Crowther	313/138.
1360294	Nov, 1920	Hill	313/138.
2029669	Feb, 1936	Nowosielski	313/144.
3442693	May, 1969	Rea	29/25.
3882338	May, 1975	Meyer	313/141.
3995184	Nov, 1976	Insley	29/25.
4028576	Jun, 1977	Wofsey	313/141.

Other Refs:
Primary Examiner: Lazarus, Richard B.
Assistant Examiner:
Attorney: Pollock, Vande Sande & Priddy