US3911326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glow plug
Assignee: Individual
•
Filing: 1975-03-10
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Granted: 1975-10-07
•
Expires: 1995-03-10
Abstract
Abstract A combustible vapor ignition device in the form of an elongated plug having a threaded body end and a coaxially disposed center electrode disposed in but spaced from an elongated bore through the body of the plug, the electrode being electrically insulated by insulation material from the body but electrically connected thereto only through a glow element disposed in the bore and attached between the inner end of the electrode and the lower end of the body, the electrode including an increased diameter electrode portion disposed in an increased diameter bore portion of the elongated bore, an annular spring washer being disposed about the center electrode between either the upper or lower wall of the increased diameter bore portion and the increased diameter electrode portion to exert a constant compression force therebetween to permanently prevent gas under pressure located in the lower portion of the bore from passing about the increased diameter electrode portion to the upper portion of the bore.
Inventors
- 👤 Irwin G Ohlsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:43
CPC Classifications
F; F23; F23Q; F23Q7/00; F23Q7/001; F23Q7/06; F23Q7/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
237 words
A glow plug for igniting combustible vapors, comprising: an elongated body of electrically conductive material and having a longitudinal axis and a longitudinal bore extending through said body coaxial with respect to said axis, said bore including an increased diameter bore portion; a center electrode disposed in but spaced from the walls of said bore and including an upper post portion extending beyond said bore, an intermediate increased diameter electrode portion disposed in said increased diameter bore portion, and a lower electrode portion; a glow element attached to said lower electrode portion and to the lower portion of said body; insulation means including electrical insulation material disposed in said increased diameter bore portion at least above and below said increased diameter electrode portion for electrically insulating said center electrode from said body; and compression means including a spring washer disposed about but spaced from said center electrode and in said increased diameter bore portion for providing a generally constant compression force between said increased diameter electrode portion and the upper and lower walls of said increased diameter bore portion and permanently preventing gas under pressure located in the lower portion of the bore from passing about the increased diameter electrode portion to the upper portion of the bore, and the upper end of said body adjacent said longitudinal bore includes an inwardly extending crimped lip portion defining the circular upper wall of said increased diameter bore portion.
Claim 2
Dependent Claim
237 words
A glow plug for igniting combustible vapors, comprising: an elongated body of electrically conductive material and having a longitudinal axis and a longitudinal bore extending through said body coaxial with respect to said axis, said bore including an increased diameter bore portion; a center electrode disposed in but spaced from the walls of said bore and including an upper post portion extending beyond said bore, an intermediate increased diameter electrode portion disposed in said increased diameter bore portion, and a lower electrode portion; a glow element attached to said lower electrode portion and to the lower portion of said body; insulation means including electrical insulation material disposed in said increased diameter bore portion at least above and below said increased diameter electrode portion for electrically insulating said center electrode from said body; and compression means including a spring washer disposed about but spaced from said center electrode and in said increased diameter bore portion for providing a generally constant compression force between said increased diameter electrode portion and the upper and lower walls of said increased diameter bore portion and permanently preventing gas under pressure located in the lower portion of the bore from passing about the increased diameter electrode portion to the upper portion of the bore, and the upper end of said body adjacent said longitudinal bore includes an inwardly extending crimped lip portion defining the circular upper wall of said increased diameter bore portion.
Claim 3
Dependent Claim
29 words
The glow plug according to claim 1, wherein said insulation means includes annular insulating washers disposed about said center electrode at each side of said increased diameter electrode portion.
Claim 4
Dependent Claim
16 words
The glow plug according to claim 1, wherein said spring washer is a Bellville spring washer.
Claim 5
Dependent Claim
22 words
The glow plug according to claim 1, wherein said spring washer is disposed about said upper post portion of said center electrode.
Claim 6
Dependent Claim
22 words
The glow plug according to claim 1, wherein said spring washer is disposed about said lower electrode portion of said center electrode.
Claim 7
Dependent Claim
16 words
The glow plug according to claim 1, also comprising a flat washer juxtaposed said spring washer.
Claim 8
Dependent Claim
27 words
The glow plug according to claim 6, wherein said flat washer is disposed between the upper wall of said increased diameter bore portion and said spring washer.
Claim 9
Dependent Claim
23 words
The glow plug according to claim 6, wherein said flat washer is disposed between said increased diameter electrode portion and said spring washer.
Claim 10
Dependent Claim
25 words
The glow plug according to claim 1, also comprising an electrically conductive idle-bar extending across said longitudinal bore at the lower end of said body.
Claim 11
Dependent Claim
16 words
The glow plug according to claim 9, wherein said idle-bar is bowed outwardly at its center.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |