Personal injury alarm warning system - has short range transmitter carried by endangered person and activated by mercury switch

摘要

The alarm system is designed e.g. for maintenance workers who may be out of sight from the maintenance team. Each ferion (A) carries a short range small radio transmitter (5). The range (R) of transmission being of the order of 10-15 metres. The transmitter is designed to be clipped to clothes of the ferion and is designed to be triggered when it is placed in a horizontal position. A mercury switch is used actuate the transmitter. The system also uses a number of radio receivers (4) fitted with flashing lamps. These receivers are fitted to a ceiling or other height position through the place where maintenance is being carried out. At least one of them is within the range of the signal emitted from the transmitter.