Combined smoke detection and furnace shut off device

• US 4,171,944 A
• Filed: 09/01/1977
• Issued: 10/23/1979
• Est. Priority Date: 09/01/1977
• Status: Expired due to Term

• Current Assignee: Anthony Orsano, Michael Barretta
• Original Assignee: Jack B. Hirschmann
• Inventors: Hirschmann, Jack B.
• Primary Examiner(s): Dority, Jr., Carroll B.
• Application Number:
  US05/829,880
• Time in Patent Office: 782 Days
• Field of Search: 431/16, 431/18, 431/22, 431/76, 340/237 S
• US Class Current: 431/22
• CPC Class Codes: F23N 2227/28 Ignition circuits
• CPC Class Codes: F23N 5/003 using detectors sensitive to combustion gas properties F23N5/02, F23N5/18 - F23N5/26 take precedence
• CPC Class Codes: F23N 5/245 using electrical or electromechanical means

Abstract

A combined smoke detection and furnace shut-off device is provided having a smoke detection means which is disposable adjacent a furnace for detecting the presence of smoke unnaturally emitted from the furnace, a means for stopping ignition within the furnace, and means responsive to detection of the smoke by said smoke detection means for activating the ignition stopping means.

Claims

1. A combined smoke detection and furnace shut-off device, comprising:

a furnace having an ignition device and a fuel supply means;

smoke detection means located in a room surrounding said furnace for detecting the presence of smoke unnaturally emitted from said furnace;

means for stopping said ignition device; and

means responsive to detection of smoke by said smoke detection means for activating said ignition stopping means.

2. A device as defined in claim 1 wherein said smoke detection means includes ionization detection means for producing an output indicative of sensed smoke, said ionization detection means activating said responsive means at a predetermined level of sensed smoke.

3. A device as defined in claim 2 including fuel supply shut-off means for stopping the supply of fuel to the furnace in response to said smoke detection means.

4. A device as defined in claim 3 wherein said responsive means is an electric circuit means for receiving a signal from said ionization detection means upon reaching said predetermined level of sensed smoke and supplying a signal to said ignition stopping means so as to activate the same.

5. A device as defined in claim 1 wherein said smoke detection means includes optical smoke detection means for producing an output indicative of sensed smoke, said optical smoke detection means activating said responsive means at a predetermined level of sensed smoke.

6. A device as defined in claim 6 including fuel supply shut-off means for stopping the supply of fuel to the furnace responsive to said smoke detection means.

7. A device as defined in claim 7 wherein said responsive means is an electric circuit means for receiving a signal from said optical smoke detection means upon reaching said predetermined level of sensed smoke and supplying a signal to said ignition stopping means so as to activate the same.