Duct smoke detector

• US 4,758,827 A
• Filed: 07/28/1986
• Issued: 07/19/1988
• Est. Priority Date: 07/28/1986
• Status: Expired due to Fees

• Current Assignee: SLC Technologies, Inc. (General Electric Company)
• Original Assignee: ADT Holdings Incorporated (Apollo Global Management, Inc.)
• Inventors: Powers, Robert B.
• Primary Examiner(s): Swann, III, Glen R.
• Assistant Examiner(s): Wong, Tat K.
• Application Number:
  US06/890,133
• Time in Patent Office: 722 Days
• Field of Search: 340/693, 340/610, 340/629, 340/628, 340/630, 340/631, 340/632, 98/42.03, 98/42.15, 406/34, 406/36, 73/861.77, 73/861.33, 73/861.74, 73/23, 73/26, 116/271, 116/273, 116/274, 116/264
• US Class Current: 340/691.7
• CPC Class Codes: G08B 17/103 using a light emitting and receiving device
• CPC Class Codes: G08B 17/113 Constructional details

Abstract

Apparatus for sensing smoke in a duct includes a housing with inlet and outlet ports and a flow chamber which directs gas flow on a path between the ports and to and from a smoke detector. A vaned rotor on the path is visible through a window in the housing gives a visual indication of the existence or nonexistence and direction of gas flow and thus whether or not normally flowing duct gas is being sensed.

Claims

1. Apparatus for detecting gas and smoke flow in a duct comprising:

a smoke detector;

a housing around the detector including inlet and outlet ports for communication with the duct and means directing gas flow on a path between the ports to and from the detector;

a vaned rotor on the path rotated by flow of gas to give a visual indication of the gas flow; and

a window into the housing for viewing the rotor.

2. Apparatus according to claim 1 including means on the housing indicating the direction of rotation by normal gas flow between the inlet port and the outlet port.

3. Apparatus according to claim 1 including a cover over the gas flow path.

4. Apparatus according to claim 3 wherein the cover is transparent over the rotor.

5. Apparatus according to claim 3 including an electronic circuit connected to the detector and located outside the cover.

6. Apparatus according to claim 1 wherein the smoke detector has a nose with openings into the detector and the cover includes an inner wall at one side of the gas flow path, admitting the nose and openings into the path.