Simplex Time Recorder Co.

Wayne A Nelson

Lawrence G Stanley

Charles B Winterble

Timothy C Repp

John S Margosiak

A smoke/fire detector assembly having a base section with electrical contacts and a removable/attachable sensor section having corresponding electrical contacts. Each one of the electrical contacts is adapted to electrically contact a corresponding one of the base section electrical contacts. Each one of the electrical contacts has a threaded hole formed therein to receive an electrical contact screw. The hole has a projecting rim disposed about a peripheral portion. The base section has a plurality of recessed pocket formed therein for a corresponding one of the plurality of base section electrical contacts. Each one of the pockets has a pair of opposing sidewalls, a platform, and a resilient tongue-like member protruding into a region between the opposing sidewalls. Upper surfaces of the platform and the tongue-like member are disposed in a common plane spaced from the bottom portions of the sidewalls to provide a channel therebetween. When engaged by a corresponding one of the electrical contacts, the tongue-like member is configured to depressed downward enabling side edge portions of the electrical contact to slide within the channel and to urge the contact upward against the bottom portions of the sidewalls. When the electrical contact is in the channel, the tongue-like member urges the electrical contact upward against the bottom portions of the sidewalls it snaps behind the rim with an audible click and securely locks the electrical contact into place in the channel.

Smoke/fire detector

A smoke detection unit has a detection chamber for sampling smoke from a surrounding environment. The detection chamber allows air circulation but is optically opaque. This configuration is typical of photoelectric smoke detectors, for example. A housing defines a window though which air from the environment circulates into and out of the detection chamber. The window's height is approximately the same as the chamber. A cage vane is positioned in the window and is configured as an inverted frustoconical member. An inner edge of the cage vane is spaced away from the chamber. The angled vane, along the other aspects of the unit's configuration, improves sensitivity by increasing smoke circulation through the chamber. This configuration guides the air currents typically created by fires at the ceiling so that the smoke flows easily into the detection chamber.

Smoke detector housing for improved smoke collection

Smoke detector

A smoke/fire detector assembly having a base section and a removable sensor section. The base section includes a plurality of electrical contacts and the sensor section includes a corresponding plurality of electrical contacts. Each one of the sensor section electrical contacts includes a member having a first end, extending from the sensor section, and a second end electrically connected to electrical components within the sensor section. Each one of the base section electrical contacts has: a first section having a surface adapted for mounting to a surface of the base section; a second section, having an edge common with the first section and a surface extending perpendicular to the surface of the first section; and, a pair of finger-like members, extending from a second edge of the second section. The second edge of the second section is perpendicular to the common edge. The finger-like members are laterally spaced along, and cantilevered from, the second edge of the second section. The finger-like members extend along a common direction. Distal ends of the finger-like members are spaced from each other laterally in a direction perpendicular to the common direction to receive, and contact, opposing surfaces of the first end of the sensor electrical contact. The first section, second section, and pair of finger-like members are a stamped, single piece thereby reducing the number of pieces required in fabricating the base section of the smoke/fire detector assembly.

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Maynard, MA, United States of America

Wayne A Nelson