Patent ID: 8334622

Claim:
An emergency stop system for a group of machine units ( 1 ), driven by energy from a source ( 2 ) such as an electrical net, medium under pressure etc. whereas each of the machine units is provided with a cut off means ( 3 ) for the energy feed, acted upon via a receiver ( 5 ) by a transmitted signal, with a radio frequency, from a transmitter in a group of mobile units ( 7 ), provided with such, carried by one or several operators characterised in that every machine unit ( 1 ) is provided with a communication unit ( 4 ) comprising an transmitter/receiver ( 5 ) for radio-resp. IR-frequency in contact with a computer unit ( 6 ) and each mobile unit ( 7 ) is provided with a transmitter/receiver for a radio-resp. IR-frequency for identifying and authorizing communication, whereas the cut off means ( 3 ) is provided not to be activated or inactivated without foregoing identifying and authorizing IR-communication.