Overloading protection device for cold circular saws

Claim 1

AN OVERLOADING PROTECTING DEVICE FOR COLD CIRCULAR SAWS COMPRISING A CIRCULAR SAW BLADE, AN ELECTRIC MOTOR HAVING A MOTOR SHAFT, A FIRST SHAFT CARRYING SAID SAW BLADE AND INCLUDING A FIRST GEAR, A GEAR TRAIN INCLUDING SAID FIRST GEAR AND OPERATIVELY CONNECTED WITH SAID MOTOR SHAFT, A SECOND SHAFT MOVABLE IN AXIAL DIRECTION AND DISPOSED IN SAID GEAR TRAIN, AN ELECTRO-MAGNETIC CLUTCH OPERATIVELY DISPOSED BETWEEN SAID MOTOR SHAFT AND SAID GEAR TRAIN, A HYDRAULIC ADVANCING DEVICE FOR SAID SAW BLADE, MEANS INCLUDING SAID ELECTRO-MAGNETIC CLUTCH FOR SHUTTING OFF THE DRIVING OPERATION OF SAID GEAR TRAIN AND OF SAID HYDRAULIC ADVANCING DEVICE IN RESPONSE TO THE TANGENTIAL COMPONENT OF THE TOOTH PRESSURE OF SAID SAW BLADE BY AXIAL DISPLACEMENT OF SAID SECOND SHAFT, SAID SHUTTING OFF MEANS IN CLUDING AN ADJUSTABLE PRESSURE SENSITIVE BOX AND CIRCUIT MEANS RESPONSIVE TO THE PRESSURE IN SAID PRESSURE SENSITIVE BOX FOR SHIFTING SAID ELECTROMAGNETIC COUPLING INTO INOPERATIVE POSITION, THEREBY DISCONNECTING SAID ELECTRIC MOTOR AND SAID ADVANCING DRIVE, THE LATTER INCLUDING AT LEAST ONE PRESSURE CYLINDER AND A SUMP, PUMP MEANS FOR FEEDING FLUID FROM SAID SUMP TO THE PRESSURE SIDE OF SAID PRESSURE CYLINDER, AND MEANS RESPONSIVE TO THE TANGENTIAL COMPONENT OF THE TOOTH PRESSURE OF SAID SAW BLADE FOR RETURN OF SAID FLUID FROM THE NON-PRESSURE SIDE OF SAID PRESSURE CYLINDER.