Browse Prior Art Database

Communication And Alarm System

IP.com Disclosure Number: IPCOM000096829D
Original Publication Date: 1963-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Ellul, JM: AUTHOR

Abstract

In photographic dark rooms and other isolated points where work is effected under hazardous and restricted conditions, it is necessary that communication be available with a control point in case of accident or there is need of information. An example is a series of hermetically sealed, air conditioned, dark rooms containing photographic baths, large cameras and processing machinery.

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Communication And Alarm System

In photographic dark rooms and other isolated points where work is effected under hazardous and restricted conditions, it is necessary that communication be available with a control point in case of accident or there is need of information. An example is a series of hermetically sealed, air conditioned, dark rooms containing photographic baths, large cameras and processing machinery.

In this system, each room has an ultrasonic microphone 10 and transmitter 11, loud speaker 12, voice microphone 14 and pilot light 15. Transmitter 11 is secured to the clothing of the worker and transmits two different frequencies. two buttons, not shown, differing in shape operate transmitter 11. One sounds an alarm in case of sickness or accident. The other signals for voice communication. With transmitter 11 secured to the clothing, there is no need to grope in the dark in either case. All rooms are connected to monitor panel 16. This contains an emergency light 17 for each room together with loud speaker 18 common to all alarm circuits. Each room has voice relay VR and emergency relay ER.

Actuation of the voice button in Room 1 transmits a frequency f1. This is picked up by microphone 10 and amplified in amplifier switch 22 to actuate relay VR1. Operation of VR1 connects microphone 14 through normally open contact VR1-1 to the power amplifier and then to all speakers 12 except that in Room 1. It is disconnected by the opening of normally closed cont...