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US4079884A Expired / Lapsed US ⏱️ 0.0 years remaining

Energy-conserving flue damper

Assignee: Individual
•
Filing: 1976-07-21
•
Granted: 1978-03-21
•
Expires: 1996-07-21
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Abstract

Abstract A flue damper to control the exhaust flow in a flue, wherein a flue damper plate is movable from an open position to a closed position by a solenoid operated plunger and returned from the closed position to the open position by a biasing spring. A damper arm actuates a normally-open limit switch closing the limit switch contacts. The limit switch is in series with normally open contacts of a thermostat, fuel valve, and power source, establishing a fuel system circuit. When the damper plate is in the closed position, the limit switch contacts are open and the fuel system circuit is broken. The plunger solenoid is connected in series with normally closed contacts of the thermostat, and power source, establishing an electrical circuit to close the damper plate. Thus, the circuit to close the damper plate and the fuel system circuit are mutually exclusive so that fuel may not be fired within the flue when the damper plate is closed.

Inventors

  • 👤 Gerald Michael Sherman

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 12:04
CPC Classifications
F; F23; F23L; F23L11/00; F23L11/005; F23N; F23N1/00; F23N1/06; F23N1/065; F23N2235/00; F23N2235/02; F23N2235/04

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 102 words
An energy-conserving control system for fuel-fired heating systems having a flue, flue damper, and fuel control means, comprising: (a) a power source; (b) a switch, having a pair of normally-closed contacts and a pair of normally-open contacts alternately operable by switch activating means; (c) signal means for sensing a flue damper position; and (d) power means to operate said flue damper; wherein said power source, said signal means, said normally-opened contacts and said fuel control means are in a first series circuit and further wherein said power source, said normally closed contacts and said power means are in a second series circuit.
Claim 2
Dependent Claim 102 words
An energy-conserving control system for fuel-fired heating systems having a flue, flue damper, and fuel control means, comprising: (a) a power source; (b) a switch, having a pair of normally-closed contacts and a pair of normally-open contacts alternately operable by switch activating means; (c) signal means for sensing a flue damper position; and (d) power means to operate said flue damper; wherein said power source, said signal means, said normally-opened contacts and said fuel control means are in a first series circuit and further wherein said power source, said normally closed contacts and said power means are in a second series circuit.
Claim 3
Dependent Claim 102 words
An improved flue damper, comprising: (a) damper means, movable from an open position to a closed position; (b) actuating means to move said damper means; (c) biasing means tending to bias said damper means to said open position; and (d) signal means to sense said damper means position wherein said signal means is in a first electric circuit with a power source means to control a fuel source, and said actuating means is in a second electric circuit with a power source means, and said first and second circuits are activated by a common switching means so as to be mutually exclusive.
Claim 4
Dependent Claim 102 words
An improved flue damper, comprising: (a) damper means, movable from an open position to a closed position; (b) actuating means to move said damper means; (c) biasing means tending to bias said damper means to said open position; and (d) signal means to sense said damper means position wherein said signal means is in a first electric circuit with a power source means to control a fuel source, and said actuating means is in a second electric circuit with a power source means, and said first and second circuits are activated by a common switching means so as to be mutually exclusive.

References Cited (Backward Citations)

US2154644A Cited
US2224705A Cited
US2508885A Cited
US3010451A Cited
US3090558A Cited
US3934796A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1981-03-20 1981-09-19 1982-03-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1985-03-20 1985-09-19 1986-03-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1989-03-20 1989-09-19 1990-03-21 $7700.00 Window Closed / Lapsed

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