Patent ID: 7982624

Claim:
A system for preventing accidents in the operation of a monitored machine or apparatus having first and second hand grips adapted to be grasped by respective hands of a user, the system comprising: a user end device or terminal in the first hand grip in direct contact with the respective hand of the user with output means for continuously or periodically transmitting an authorizing user data signal through the body of the user, and a signal receiver assigned to the monitored apparatus or machine and having interface means in the second hand grip in contact with the respective hand of the user for receiving the authorizing data signal transmitted through the body of the user from the first grip, means for continuously or periodically testing the received data signal, means for outputting a clearance signal that allows operation of the monitored machine or apparatus after a successful test of the received authorizing user data signal, and means for terminating output of the clearance signal following a successful test of the authorizing user data signal when a subsequent test of the data signal fails, whereby the monitored machine or apparatus can only be operated when held by the user with both hand grips.