US3852629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Offset stinger for arc lamp
Assignee: Excelitas Technologies Illumination Inc
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Filing: 1973-12-13
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Granted: 1974-12-03
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Expires: 1993-12-13
Abstract
Abstract In a gas-filled lamp an arc is initiated by withdrawal of a stinger electrode from contact with a stationary cathode, with subsequent transfer of the arc to the gap between the cathode and a stationary anode. The anode is cylindrical; and the stinger is elongate and is movably mounted within and electrically insulated from the anode. The cathode is elongate, having a long axis parallel to but spaced apart from the long axis of the stinger. The stinger contacts the cathode at other than the tip of the cathode, thereby precluding continual impacting of the stinger on the cathode tip with concomitant blunting of the cathode tip during the use cycle of the lamp. A magnetic core is affixed to the stinger, whereby the stinger can be moved by the energization of a solenoid. The magnetic core is apertured to provide a dashpot effect to damp the motion of the stinger.
Inventors
- 👤 W Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:12
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/98; H05; H05B; H05B31/00; H05B31/02; H05B31/30; H05B31/305
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
109 words
An arc lamp comprising a sealed envelope containing an ionizable gas, first and second electrodes mounted in fixed positions in said envelope, each fixed electrode having an apical end portion spaced apart from an apical end portion of the other fixed electrode to form an arc gap therebetween, a stinger electrode movably mounted in said envelope, means for moving said stinger between a first position in contact with a surface portion of said first fixed electrode to a second position away from contact with said first fixed electrode, said surface portion of said first fixed electrode being located at other than the apex of the apical end portion thereof.
Claim 2
Dependent Claim
109 words
An arc lamp comprising a sealed envelope containing an ionizable gas, first and second electrodes mounted in fixed positions in said envelope, each fixed electrode having an apical end portion spaced apart from an apical end portion of the other fixed electrode to form an arc gap therebetween, a stinger electrode movably mounted in said envelope, means for moving said stinger between a first position in contact with a surface portion of said first fixed electrode to a second position away from contact with said first fixed electrode, said surface portion of said first fixed electrode being located at other than the apex of the apical end portion thereof.
Claim 3
Dependent Claim
34 words
The arc lamp of claim 1 wherein said first fixed electrode is elongate, said second fixed electrode is cylindrical, and said stinger is movably mounted within and electrically insulated from said second fixed electrode.
Claim 4
Dependent Claim
35 words
The arc lamp of claim 2 wherein said cylindrical second fixed electrode comprises a flat end face perpendicular to the cylindrical axis thereof, said apical end portion thereof being a projection from said end face.
Claim 5
Dependent Claim
74 words
The arc lamp of claim 1 wherein a portion of said envelope is generally cylindrical, said stinger is elongate within said cylindrical portion of said envelope, a magnetic core is affixed to said stinger and is diposed to move in sliding contact with the interior surface of said cylindrical portion of said envelope, and a spring biased against said sliding movement of said magnetic core is mounted within said cylindrical portion of said envelope.
Claim 6
Dependent Claim
34 words
The arc lamp of claim 4 wherein said magnetic core is apertured so that said movement of said magnetic core provides a dashpot effect with respect ot said gas, whereby said movement is damped.
Claim 7
Dependent Claim
39 words
The arc lamp of claim 5 wherein said sliding movement of said apertured magnetic core permits the passage of a portion of said gas along a path through said magnetic core parallel to the long axis of said stinger.
Claim 8
Dependent Claim
52 words
The arc lamp of claim 2 wherein said stinger is elongate and is mounted so that the long axis thereof substantially coincides with the axis of said cylindrical second fixed electrode, said long axis of said stinger being parallel to and spaced apart from the long axis of said first fixed electrode.
Claim 9
Dependent Claim
29 words
The arc lamp of claim 2 wherein the apex of the apical end portion of said second fixed electrode lies on the long axis of said first fixed electrode.
Claim 10
Dependent Claim
20 words
The arc lamp of claim 4 wherein said spring is disposed intermediate said magnetic core and said second fixed electrode.
Claim 11
Dependent Claim
54 words
The arc lamp of claim 1 wherein said envelope further contains a reflector, said reflector comprising a Concave reflective surface disposed generally symmetrically about an axis coincident with said arc gap, a portion of said reflective surface being a segment of an ellipsoid, a focus of said ellipsoid being located within said arc gap.
Claim 12
Dependent Claim
33 words
The arc lamp of claim 10 wherein said first fixed electrode is a cathode and said focus of said ellipsoid is located within said arc gap immediately adjacent the apex of said cathode.
References Cited (Backward Citations)
US3588572A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |