US5347981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pilot pressure switch and method for controlling the operation of a furnace
Assignee: Quietflex Manufacturing Co LP
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Filing: 1993-09-07
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Granted: 1994-09-20
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Expires: 2013-09-07
Abstract
Abstract A pilot pressure switch for a furnace detects the fluid pressure within the pilot line for a pilot flame, and upon the fluid pressure in the pilot line exceeding a predetermined value, an electrical signal from a thermostat may be passed to a furnace blower control to operate the furnace main blower and furnace vent blower.
Inventors
- 👤 Malcolm Southern
- 👤 Walter Wolenski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:19
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/24; F23N5/245; F23N2225/00; F23N2225/04; F23N2225/08; F23N2225/12; F23N2227/00; F23N2227/22; F23N2229/00; F23N2233/00; F23N2233/02; F23N2233/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
143 words
A pilot pressure switch for a furnace having a continuously burning pilot flame in fluid communication with a furnace gas valve by a pilot line disposed between the pilot flame and the gas valve, the furnace also including a thermostat and a blower control with at least one wire disposed between the thermostat and the blower control, comprising: a means for detecting the fluid pressure within the pilot line, the fluid pressure detecting means being disposed in fluid communication with the pilot line; and a means for controlling the passage of an electrical signal through the at least one wire in response to the fluid pressure detected in the pilot line, whereby if the fluid pressure detected in the pilot line exceeds a predetermined fluid pressure, the electrical signal from the thermostat passes through the at least one wire to the blower control.
Claim 2
Dependent Claim
143 words
A pilot pressure switch for a furnace having a continuously burning pilot flame in fluid communication with a furnace gas valve by a pilot line disposed between the pilot flame and the gas valve, the furnace also including a thermostat and a blower control with at least one wire disposed between the thermostat and the blower control, comprising: a means for detecting the fluid pressure within the pilot line, the fluid pressure detecting means being disposed in fluid communication with the pilot line; and a means for controlling the passage of an electrical signal through the at least one wire in response to the fluid pressure detected in the pilot line, whereby if the fluid pressure detected in the pilot line exceeds a predetermined fluid pressure, the electrical signal from the thermostat passes through the at least one wire to the blower control.
Claim 3
Dependent Claim
19 words
The pilot pressure switch of claim 1, wherein the means for detecting the fluid pressure is a diaphragm switch.
Claim 4
Dependent Claim
38 words
The pilot pressure switch of claim 1, wherein the means for controlling the passage of the electrical signal is a single pole, single throw electrical switch which is operatively associated with the means for detecting the fluid pressure.
Claim 5
Dependent Claim
34 words
The pilot pressure switch of claim 2, wherein the means for controlling the passage of the electrical signal is a single pole, single throw electrical switch which is operatively associated with the diaphragm switch.
Claim 6
Independent Claim
128 words
A method for controlling the operation of a furnace having a continuously burning pilot flame in fluid communication with a furnace gas valve by a pilot line disposed between the pilot flame and the gas valve, the furnace also including a thermostat and a blower control with at least one wire disposed between the thermostat and the blower control, comprising the steps of: detecting the fluid pressure within the pilot line; controlling the passage of an electrical signal through the at least one wire in response to the fluid pressure in the pilot line; and permitting the electrical signal to pass through the at least one wire from the thermostat to the blower control when the fluid pressure detected in the pilot line exceeds a predetermined fluid pressure.
Claim 7
Independent Claim
128 words
A method for controlling the operation of a furnace having a continuously burning pilot flame in fluid communication with a furnace gas valve by a pilot line disposed between the pilot flame and the gas valve, the furnace also including a thermostat and a blower control with at least one wire disposed between the thermostat and the blower control, comprising the steps of: detecting the fluid pressure within the pilot line; controlling the passage of an electrical signal through the at least one wire in response to the fluid pressure in the pilot line; and permitting the electrical signal to pass through the at least one wire from the thermostat to the blower control when the fluid pressure detected in the pilot line exceeds a predetermined fluid pressure.
Claim 8
Dependent Claim
45 words
The method of claim 5, including the step of not permitting the electrical signal to pass through the at least one wire from the thermostat to the blower control when the fluid pressure detected in the pilot line is less than the predetermined fluid pressure.
Claim 9
Dependent Claim
30 words
The method of claim 5, including the step of utilizing a diaphragm switch disposed in fluid communication with the pilot line to detect the fluid pressure in the pilot line.
Claim 10
Dependent Claim
31 words
The method of claim 5, including the step of utilizing a single pole, single throw electrical switch to control the passage of the electrical signal through the at least one wire.
Claim 11
Dependent Claim
44 words
The method of claim 8, including the step of closing the single pole, single throw electrical switch to permit the electrical signal to pass through the at least one wire, when the fluid pressure detected in the pilot line exceeds the predetermined fluid pressure.
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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) | 1997-09-19 | 1998-03-21 | 1998-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-19 | 2002-03-21 | 2002-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-19 | 2006-03-21 | 2006-09-20 | $7700.00 | Window Closed / Lapsed |