Improvements in a control and safety system for electrically operated devices.

摘要

A control and safety system for electrically operated devices wwith a cutting tool (9) connected to a reversible electric motor (88), and control means for halting and reversing the movement of said motor comprises a pair of electrically conducting gloves (A) and (B) to be worn by the operator and connected by a conducting wire (2, 3) to a box (4) fixed to the operator's body and containing a rechargeable battery and an electronic sensor-transmitter circuit (120) arranged to emit a light pulse when the the gloves are both worn by the operator and to interrupt it when one of the two gloves or part of the operator's body accidentally makes contact with any metal part of the device (10); an optical fibre (12) arranged to connect said box (4) to the base of the device where it is connected to a receiving control circuit (121) located thereat; a manually operable reset pushbutton mounted on said box to reset the conditions of the electronic circuit contained therein after each operation; and a pedal (23) mounted on the base of the device and arranged to energize one or the other or neither of the circuits of the reversible electric motor (88) via a pair of relays (R1, R2), of which one is normally closed and the other is normally open.