Patent US3697213A successfully refreshed from Google Patents.
US3697213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion system for a heater or the like
Assignee: Volkswagen AG
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Filing: 1971-05-03
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Granted: 1972-10-10
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Expires: 1991-05-03
Abstract
Abstract A combustion system, particularly for a fuel burning heater that incorporates a glow plug for initiating combustion and a spark plug for maintaining the combustion. An improved switching arrangement is employed for shutting off the glow plug and initiating the spark plug operation at the appropriate period. This system includes a temperature sensing arrangement that senses the temperature in the combustion chamber by means of a remotely positioned radiantly sensitive switching element. This switching element in effect views the temperature in the combustion chamber through a hollow shaft that drives a fan, which fan circulates the combustion products through the chamber. The sensing element may also be employed for continuing the operation of the fan for a predetermined time period after combustion in the combustion chamber ceases.
Inventors
- 👤 Hans Joachim Ehrenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:38
CPC Classifications
B; B60; B60H; B60H1/00; B60H1/22; B60H1/2203; B60H1/2206; B60H2001/2246; B60H2001/2256; B60H2001/2268
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
112 words
In a combustion system including a combustion chamber, a firing device for maintaining combustion within the combustion chamber and a fan for providing circulation in the chamber, the improvement comprising a remotely positioned sensing device for performing a switching function in response to temperature variations in the combustion chamber, said sensing device being positioned remotely from said combustion chamber and sensitive to radiant energy for generating a signal when a predetermined magnitude of radiant energy is experienced, said fan being mounted on a hollow drive shaft which drive shaft extends into said combustion chamber, said hollow drive shaft being positioned to transmit radiant energy from said combustion chamber to said sensing device.
Claim 2
Dependent Claim
112 words
In a combustion system including a combustion chamber, a firing device for maintaining combustion within the combustion chamber and a fan for providing circulation in the chamber, the improvement comprising a remotely positioned sensing device for performing a switching function in response to temperature variations in the combustion chamber, said sensing device being positioned remotely from said combustion chamber and sensitive to radiant energy for generating a signal when a predetermined magnitude of radiant energy is experienced, said fan being mounted on a hollow drive shaft which drive shaft extends into said combustion chamber, said hollow drive shaft being positioned to transmit radiant energy from said combustion chamber to said sensing device.
Claim 3
Dependent Claim
47 words
A combustion system as set forth in claim 1 wherein the firing device comprises a glow plug and a spark gap, said sensing device being in circuit with said glow plug for switching off said glow plug when a predetermined temperature is experienced in the combustion chamber.
Claim 4
Dependent Claim
56 words
A combustion system as set forth in claim 1 wherein the fan includes a motor for driving the fan and further including control circuit means for operating said fan motor, said control circuit means being in circuit with said sensing device for switching said fan motor when a predetermined temperature is experienced in said combustion chamber.
Claim 5
Dependent Claim
47 words
A combustion system as set forth in claim 3 wherein the firing device comprises a glow plug and a spark gap, said sensing device being in circuit with said glow plug for switching off said glow plug when a predetermined temperature is experienced in the combustion chamber.
Claim 6
Dependent Claim
42 words
A combustion system as set forth in claim 1 wherein the fan is disposed in proximity to an air intake for the combustion chamber, the hollow fan shaft terminating adjacent the sensing device and on the upstream side of the combustion chamber.
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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |