US3745400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Igniter plug
Assignee: Bendix Corp
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Filing: 1972-03-23
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Granted: 1973-07-10
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Expires: 1992-03-23
Abstract
Abstract An igniter plug for a turbine engine capable of operating at high temperatures without failure of internal pressure seals that prevent the leakage of gases from the combustion chamber of the turbine through the igniter plug that adversely affect the ignition exciter assembly. The novel internal pressure seal within the igniter plug includes a cylindrical metal sleeve having a first portion brazed to an intermediate insulator that surrounds a central electrode and a second portion of larger diameter that has its edge welded around the periphery thereof to the igniter plug shell. This arrangement allows the igniter plug shell and intermediate insulator to expand and contract in response to extreme changes in temperature without breaking the pressure seal between the shell and the insulator.
Inventors
- 👤 H Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:32
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/26; F02C7/264; F02C7/266
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
250 words
In combination with a spark plug of the type having an inner elongated electrode having a front portion and a rear portion; an intermediate elongated insulator disposed around at least a portion of the electrode, said insulator having a front portion and a rear portion; means for providing a pressure tight seal between said inner electrode and said elongated insulator; an outer elongated metal shell disposed around the electrode and electrically isolated therefrom by the insulator, said metal shell having a rear portion that has an opening therein and a front end portion arranged to provide a spark gap with the end of the front portion of said electrode, the improvement comprising: a metal sleeve having a front end portion that includes an opening that is in mated relationship with the rear portion of said insulator, the inside of said front end portion of said sleeve annularly brazed to the outside rear portion of said insulator; and a rear end portion having a configuration that matches the opening in the rear of said metal shell, the rear end of said metal sleeve annularly welded to the rear end of said metal shell, said metal sleeve comprised of a single piece of metal that has two cylindrical portions of different diameters connected together by a third portion having an axis of revolution that makes an angle with the axis of said cylindrical portions between about 35 to 55 degrees, whereby said insulator and said shell are connected together by said sleeve.
Claim 2
Dependent Claim
250 words
In combination with a spark plug of the type having an inner elongated electrode having a front portion and a rear portion; an intermediate elongated insulator disposed around at least a portion of the electrode, said insulator having a front portion and a rear portion; means for providing a pressure tight seal between said inner electrode and said elongated insulator; an outer elongated metal shell disposed around the electrode and electrically isolated therefrom by the insulator, said metal shell having a rear portion that has an opening therein and a front end portion arranged to provide a spark gap with the end of the front portion of said electrode, the improvement comprising: a metal sleeve having a front end portion that includes an opening that is in mated relationship with the rear portion of said insulator, the inside of said front end portion of said sleeve annularly brazed to the outside rear portion of said insulator; and a rear end portion having a configuration that matches the opening in the rear of said metal shell, the rear end of said metal sleeve annularly welded to the rear end of said metal shell, said metal sleeve comprised of a single piece of metal that has two cylindrical portions of different diameters connected together by a third portion having an axis of revolution that makes an angle with the axis of said cylindrical portions between about 35 to 55 degrees, whereby said insulator and said shell are connected together by said sleeve.
Claim 3
Dependent Claim
33 words
The combination as recited in claim 1 wherein the opening in the front end portion of said metal sleeve is smaller than the opening in the rear end portion of said metal sleeve.
Claim 4
Dependent Claim
24 words
The combination as recited in claim 1 wherein said electrode, said insulator, said shell and said metal sleeve are generally cylindrical and concentrically arranged.
Claim 5
Dependent Claim
24 words
The combination as recited in claim 2 wherein said electrode, said insulator, said shell and said metal sleeve are generally cylindrical and concentrically arranged.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |