American District Telegraph Company

Adt, Inc.

Robert B Powers

Angelo A Marsocci

Hugh P Thornton, Jr

John K Guscott

Hugh D Dyer

Bruce E Chapman

Donald Adams

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.

Duct smoke detector

An optical block for the exciter lamp and photocell includes a base with a first seat holding the lamp on a first optical axis and a second seat holding the cell on an intersecting optical axis. A cover with two light passages along the axes has a socket into which the base snap fits to confine the lamp and cell in their seats.

Optical block in smoke detectors

Photoelectric smoke detector

Smoke detector

A mounting bracket having multiple bayonet coupling elements which interengage with the bayonet coupling elements located on the body of an electrical instrument to be attached to a junction box. Additionally and in combination with the bayonet coupling elements, on the bracket and instrument body respectively, are included a pawl and ratchet arrangement for providing fine rotational adjustment while a toothed spring finger attached to the bracket engages a notched annular wall on the instrument body so as to latch and further secure the bracket to the body. It is anticipated that the mounting bracket will have to be attached to any one of several types of junction box thereby necessitating a multidirectional coupling arrangement for properly attaching the subject instrument to the particular junction box encountered.

Multidirectional mount for electrical instruments

A passive infrared detection system which exhibits a consistent optical aperture and sensitivity over different operating ranges. The system includes a mirror assembly having a plurality of spherical segments arranged in two or more ranks, each corresponding to a different operating range. Each mirror segment is disposed at its respective focal length from a detector, and is of a size and configuration to provide an intended optical aperture to achieve uniform detection sensitivity irrespective of the range of the target.

Multiple range passive infrared detection system

An optical smoke detector including a plurality of walls extending from a dark chamber in which an optical smoke sensor is located. The walls form passages in the detector which extend from smoke entrances on the outer perimeter to smoke ports that feed into the dark chamber. In construction, the smoke entrances extend substantially continuously around the perimeter of the smoke detector to allow the free entry of smoke into the dark chamber. Each wall is arranged to overlap the next so as to obstruct the direct rays of light from entering the dark chamber and a screen is disposed around the perimeter of the detector to prevent the entrance of insects into the dark chamber.

Growing community of inventors

Norwell, MA, United States of America

Robert B Powers