| 摘要 |
A staff-location and signal system for mines, in which conventional radio telephone devices can be used for producing a radio telephone connection between an exchange and base stations or between the base stations and radio telephone equipment in the mine area. All underground employees, whether they carry radio telephones or not, can be reached by warning signals or staff-location signals sent via apparatus carried by the employees. To this end, the miner's lamps are associated with radio receivers which respond to cooled signals transmitted by the base station and thereupon actuate a switching device. The normally-closed working-current circuit of the lamp contains a switch which can be operated by the actuated switching device so that it switches the miner's lamp on and off. In this manner all miners can be raised when necessary by warning or staff-location signals in the form of flashes. Alternatively, switching devices actuated by the coded radio signals can be associated with some lamps in the general lighting system so as to provide warning signals which are clearly visible even in strongly-illuminated areas. |
