Patent US3795843A successfully refreshed from Google Patents.
US3795843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High voltage pulse generating apparatus
Assignee: Diamond Electric Manufacturing Co Ltd
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Filing: 1972-07-25
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Granted: 1974-03-05
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Expires: 1992-07-25
Abstract
Abstract A combustion control device for controlling the combustion of a liquid fuel such as petroleum fuel. The device incorporates a capacitor-discharging ignition, a prepurging operation, a postignition extending operation and safety means for preventing accidents which may occur due to system faults.
Inventors
- 👤 Y Ishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:49
CPC Classifications
F; F23; F23Q; F23Q3/00; F23Q3/004; F23N; F23N5/00; F23N5/02; F23N5/022; F23N2239/00; F23N2239/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
228 words
A device for controlling the ignition and combustion of a burner said device cOmprising a. spark gas means for providing a spark to ignite said burner; b. ignition transformer means for coupling energy to said spark gap means; c. main capacitor means for discharging energy stored therein through said ignition transformer means; d. normally non-conducting thyristor means connected in series with said main capacitor means and said ignition transformer means to form an ignition circuit for providing the discharge path of said main capacitor means through said ignition transformer means; e. first timer means connected in series with said main capacitor means for completing said ignition circuit and rendering said thyristor means conducting after a first predetermined time period; f. flame detector means responsive to a predetermined postignition burner flame for interrupting said ignition circuit and rendering said thyristor means non-conducting; and g. safety switch means connected in series with said flame detector means and said first timer means for timing a second predetermined time period after said first predetermined time period and turning off said burner after said second predetermined time period, wherein said flame detector means prevents said safety switch means from completing said second time period upon the detection of a flame whereby said safety switch means turns off said burner only when said burner is in an operating state and no flame is detected.
Claim 2
Independent Claim
228 words
A device for controlling the ignition and combustion of a burner said device cOmprising a. spark gas means for providing a spark to ignite said burner; b. ignition transformer means for coupling energy to said spark gap means; c. main capacitor means for discharging energy stored therein through said ignition transformer means; d. normally non-conducting thyristor means connected in series with said main capacitor means and said ignition transformer means to form an ignition circuit for providing the discharge path of said main capacitor means through said ignition transformer means; e. first timer means connected in series with said main capacitor means for completing said ignition circuit and rendering said thyristor means conducting after a first predetermined time period; f. flame detector means responsive to a predetermined postignition burner flame for interrupting said ignition circuit and rendering said thyristor means non-conducting; and g. safety switch means connected in series with said flame detector means and said first timer means for timing a second predetermined time period after said first predetermined time period and turning off said burner after said second predetermined time period, wherein said flame detector means prevents said safety switch means from completing said second time period upon the detection of a flame whereby said safety switch means turns off said burner only when said burner is in an operating state and no flame is detected.
Claim 3
Dependent Claim
29 words
The device as set forth in claim 1 further including means for purging said burner wherein said burner is prepurged at the beginning of said first predetermined time period.
Claim 4
Dependent Claim
47 words
The device as set forth in claim 1 wherein said safety switch means includes a heater and a heat sensitive switch wherein the detection of a flame by said flame detector means cuts the current through said heater thus preventing it from operating said heat sensitive switch.
Claim 5
Dependent Claim
25 words
The device as set forth in claim 1 wherein said first timer means includes a thermal switch comprising a heater and a normally open switch.
Claim 6
Dependent Claim
71 words
The device as set forth in claim 1 wherein said first timer means comprises a. first Schmitt trigger means in series with said flame detector means; b. relay means having a contact in series with said main capacitor means; c. second Schmitt trigger means for energizing said relay means; and d. timing capacitor means for switching said second Schmitt trigger means after said first predetermined time period, thus energizing said relay.
Claim 7
Dependent Claim
138 words
The device as set forth in claim 4 wherein said safety switch means comprises a. a microswitch; b. a first leaf spring for switching said microswitch; c. a stationary bracket; d. a U shaped leaf spring mounted on said bracket, the open end of said U being adjustable; e. an arm mounted on one arm of said U shaped leaf spring; and f. a J shaped bimetal piece mounted on said arm and positioned to hold said first leaf spring in a position wherein said microswitch is in a first state whereby upon the heating of said bimetal piece to a predetermined level, said bimetal piece moves to a position to release said first leaf spring thus switching said microswitch to a second state, wherein the time required to reach said predetermined level is said second time period.
Claim 8
Dependent Claim
47 words
The device as set forth in claim 6 said safety switch means further including means for adjusting the opening of said U shaped leaf spring wherein the adjustment of said opening causes a corresponding adjustment in said predetermined temperature level and thus said second predetermined time period.
References Cited (Backward Citations)
US3287608A
Cited
US3384439A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |