Cairns & Brother Inc.

Cairnsair, Inc.

Robert E Gray

Robert M Armstrong

Christopher E Coombs

Walter J Lybrand

Gene Keohane

Lawrence H Zuckerman

Kurt P Schuler

Robert J Richter

Jeffrey N Olsen

Jeffrey Norman Olsen

Robert Muir Armstrong

Combination head-protective helmet and communications system including a head-protective helmet and a flexible flame retardant earflap mounted removably to the helmet wherein a voice communications system including interconnected transceiver circuitry, microphone, speaker, battery and antenna is mounted on the earflap for quick and easy removal from the helmet with the earflap.

Combination head-protective helmet and communications system

A generally hands-free, voice communication system in combination with a head-protective helmet. The helmet protects the wearer's head and the communications system permits voice communications between journeyman personnel, e.g. firefighters, police, military, industrial, hazardous material handling personnel, in relatively close proximity with each other and between journeymen and a group leader; and the group leader's communication system to also permit relatively long-range communication between the group leader and a relatively distant communications center such as a fire engine or distant fire company, base station or repeater.

Combination head-protective helmet & communications system

A self-contained breathing assembly of the positive pressure type including a remotely positioned improved pressure demand regulator for substantially instantaneous response for breathing air having reduced operating parts substantially reducing potential breakdown and wherein there is provided a gas flow disconnect assembly between the user facepiece and gas conduits.

Positive pressure breathing assembly and demand regulator therefor

An assembly is disposed on a helmet for monitoring predetermined thresholds of ambient thermal condition of the helmet. Such assembly includes at least one thermistor for sensing the status of an ambient thermal condition and a signal comparator for detecting each predetermined threshold. Individual LED's visually indicate when each predetermined threshold is reached, while an audible alarm indicates when a hazardous predetermined threshold is reached. The audible alarm is further utilized to indicate if the battery voltage is under a predetermined threshold which is predicated on the breakdown voltage of a reference diode when a test switch is closed. A temperature responsive switch is also included to conserve the life of the battery by activating and deactivating the assembly about a predetermined temperature level.

Assembly for monitoring helmet thermal conditions

There is disclosed a pressure monitoring device for self-containing breathing apparatus including visual indicators disposed in the field of view from the headpiece to monitor when predetermine pressure levels are reached in the tank which supplies gas to that headpiece. The predetermined pressure levels are referenced to the residual tank pressure at which the required breathing gas flow is not sustained and visual alarm provisions anticipate those predetermined pressure levels which are critical, in some embodiments of the invention. A cost effective transducer of reduced pressure range senses the tank pressure and noise is eliminated from the transducer signal by common mode rejection in still other embodiments.

Pressure monitoring device for self-contained breathing apparatus

There is diclosed a self-contained breathing assembly of the positive pressure type including a remotely positioned improved pressure demand regulator for substantially instantaneous response for breathing air having reduced operating parts substantially reducing potential breakdown and wherein there is provided a gas flow disconnect assembly between the user face mask and gas flow conduits.

There is disclosed a self-contained breathing apparatus of the positive pressure type wherein there is provided a pneumatic servo mechanism responsive to a pressure sensor to drive a breathing storage chamber by expansion of an oxygen containing gas from a storage tank therefor.

Growing community of inventors

Glen Mills, PA, United States of America

Robert E Gray