Patent ID: 7928610

Claim:
A two-hand switch device, comprising: a first RFID tag configured to be worn on a pre-determined position of a left hand of a worker; a second RFID tag configured to be worn on a pre-determined position of a right hand of the worker; a left hand RF antenna placed in such a position as to enable a communication with the first RFID tag worn on the pre-determined position of the left hand of the worker only when the left hand of the worker is placed in a pre-determined left hand safe position; a right hand RF antenna placed in such a position as to enable a communication with the second RFID tag worn on the pre-determined position of the right hand of the worker only when the right hand of the worker is placed in a pre-determined right hand safe position; and an output signal generating means for generating, only when it is determined that a time difference between a left reception time point and a right reception time point is within a tolerance, an output signal according to signals received by the left hand RF antenna and the right hand RF antenna.