Patent US3882338A successfully refreshed from Google Patents.
US3882338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Igniter plug
Assignee: Honeywell International Inc
•
Filing: 1974-01-16
•
Granted: 1975-05-06
•
Expires: 1994-01-16
Abstract
Abstract An igniter plug for a turbine engine capable of operating at high temperatures without failure of internal insulators that separate the main electrode from the ground electrode. The igniter plug includes an internal spring (100 or 200) that allows a forward insulator (80) to move in response to thermal expansion and contraction and to continually forwardly bias the insulator (80) against the front portion of the ground electrode (20) so that the insulator (80) is always in pressure contact with the forward end of the ground electrode (20).
Inventors
- 👤 Helmut P Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:46
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/20; H01T13/24
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
311 words
In combination with a spark plug of the type having an inner elongated electrode having a front portion and a rear portion; a forward elongated insulator disposed around the forward portion of said electrode; an intermediate elongated insulator disposed around at least the rear portion of said electrode, said intermediate insulator having a front portion and a rear portion; an outer elongated metal shell disposed around the electrode and electrically isolated therefrom by the forward and intermediate insulators, 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, said forward elongated insulator having its forward end immediately adjacent the spark gap, a first forward portion in contact with a portion of the front end of said outer elongated metal shell, and a second forward portion in contact with a portion of the front end of the inner elongated electrode whereby said forward elongated insulator extends adjacent said spark gap between said metal shell and inner electrode; and a metal sleeve having a front end portion that includes an opening that is in mated relationship with the rear portion of said intermediate insulator, the inside of said front end portion of said sleeve annularly fastened in pressure tight relationship to the outside rear portion of said intermediate 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 fastened in pressure tight relationship to the rear end of said metal shell whereby said intermediate insulator and said shell are connected together by said sleeve, the improvement comprising: means for slidably mounting said forward insulator, including means for axially and resiliently biasing said forward insulator against said front end portion of said shell.
Claim 2
Dependent Claim
311 words
In combination with a spark plug of the type having an inner elongated electrode having a front portion and a rear portion; a forward elongated insulator disposed around the forward portion of said electrode; an intermediate elongated insulator disposed around at least the rear portion of said electrode, said intermediate insulator having a front portion and a rear portion; an outer elongated metal shell disposed around the electrode and electrically isolated therefrom by the forward and intermediate insulators, 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, said forward elongated insulator having its forward end immediately adjacent the spark gap, a first forward portion in contact with a portion of the front end of said outer elongated metal shell, and a second forward portion in contact with a portion of the front end of the inner elongated electrode whereby said forward elongated insulator extends adjacent said spark gap between said metal shell and inner electrode; and a metal sleeve having a front end portion that includes an opening that is in mated relationship with the rear portion of said intermediate insulator, the inside of said front end portion of said sleeve annularly fastened in pressure tight relationship to the outside rear portion of said intermediate 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 fastened in pressure tight relationship to the rear end of said metal shell whereby said intermediate insulator and said shell are connected together by said sleeve, the improvement comprising: means for slidably mounting said forward insulator, including means for axially and resiliently biasing said forward insulator against said front end portion of said shell.
Claim 3
Dependent Claim
65 words
The combination as recited in cLaim 1 wherein the means for biasing said insulator against said front end portion of said shell comprises: a spring compressedly captivated between a rearward facing shoulder located on the outside of said forward insulator front portion and a forwardly facing shoulder located on the inside of said shell adjacent to and spaced from said forward insulator rearward facing shoulder.
Claim 4
Dependent Claim
36 words
The combination as recited in claim 1 wherein said means for biasing said forward insulator includes a spring compressedly captivated between the rear end of said forward insulator and stop means located in said metal shell.
Claim 5
Dependent Claim
41 words
The combination as recited in claim 1 wherein said means for biasing said forward insulator includes a spring disposed within said shell that applies an axial force to said forward insulator in the direction of the front portion of said shell.
Claim 6
Dependent Claim
173 words
In combination with a spark plug of the type having an inner elongated electrode having a front portion and a rear portion; an elongated insulator means disposed around at least a portion of the electrode, said insulator means having a front portion and a rear portion; an outer elongated metal shell disposed around the electrode and electrically isolated therefrom by said insulator means, said metal shell having a rear portion and a front portion arranged to provide a spark gap with the end of the front portion of said electrode; the front end of said insulator means having a surface, disposed adjacent the spark gap, that extends from the front portion of said metal shell to the front portion of said inner elongated electrode; and means for providing an annular pressure-tight seal between the rear portions of said center electrode, said insulator and said shell, the improvement comprising: means for slidably mounting said insulator means, including means for axially biasing said elongated insulator means against said front end portion of said metal shell.
Claim 7
Dependent Claim
173 words
In combination with a spark plug of the type having an inner elongated electrode having a front portion and a rear portion; an elongated insulator means disposed around at least a portion of the electrode, said insulator means having a front portion and a rear portion; an outer elongated metal shell disposed around the electrode and electrically isolated therefrom by said insulator means, said metal shell having a rear portion and a front portion arranged to provide a spark gap with the end of the front portion of said electrode; the front end of said insulator means having a surface, disposed adjacent the spark gap, that extends from the front portion of said metal shell to the front portion of said inner elongated electrode; and means for providing an annular pressure-tight seal between the rear portions of said center electrode, said insulator and said shell, the improvement comprising: means for slidably mounting said insulator means, including means for axially biasing said elongated insulator means against said front end portion of said metal shell.
Claim 8
Dependent Claim
26 words
The combination recited in claim 5 wherein the means for biasing said elongated insulator means against the front end portion of said shell comprises: a spring.
Claim 9
Dependent Claim
53 words
The combination recited in claim 6 wherein said spring is compressedly captivated between a rearwardly facing shoulder located on the outside of said elongated insulator front portion and a forwardly facing shoulder located on the inside of the front portion of said shell adjacent to and spaced from said insulator rearwardly facing shoulder.
Claim 10
Dependent Claim
33 words
The combination as recited in claim 6 wherein said spring is within said shell and exerts an axial force on said insulator means in the direction of the front portion of said electrode.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |