Rf suppression apparatus

Claim 1

A RADIO FREQUENCY NOISE-FREE MOTOR DRIVE UNIT COMPRISED OF, AN ELECTRIC AND MAGNETIC FIELD EMANATING DIRECT CURRENT MOTOR. A HOUSING, SAID DIRECT CURRENT MOTOR MOUNTED WITHIN SAID HOUSING, SAID HOUSING HAVING SHIELDING LAMINATES TO PREVENT A PORTION OF SAID ELECTRIC AND MAGNETIC FIELDS FROM EXTENDING BEYOND SAID HOUSING, SAID MOTOR HAVING A DRIVING SHAFT EXTENDING THROUGH AN APERTURE IN SAID HOUSING, SAID MOTOR HAVING ARMATURE WINDINGS AND COMMUTATOR BRUSHES ELECTRICALLY CONNECTED THERETO WHERETHROUGH ELECTRIC CURRENT IS DELIVERED TO SAID WINDINGS, SAID MOTOR HAVING A GOVERNOR OF THE TYPE HAVING A PAIR OF MOVEABLE CONTACTS IN SAID HOUSING WHICH INTERMITTENTLY INTERRUPTS THE CURRENT SUPPLIED TO SAID COMMUTATOR TO CONTROL SAID MOTOR SPEED AND ALSO PRODUCING AN UNDESIRABLE RADIO FREQUENCY ENERGY. A DIODE CONNECTED ACROSS THE COMMUTATOR MEANS FOR PROVIDING A LOW IMPEDANCE PATH FOR THE REACTIVE CURRENT GENERATED IN THE ARMATURE WINDINGS WHEN THE CONTACTS ARE OPEN, COMPRISING A DIODE CONNECTED IN A PARALLEL WITH SAID MOTOR AND COMMUTATOR BRUSHES, AND A RESISTOR CONNECTED IN PARALLEL WITH SAID GOVERNOR TO LIMIT CURRENT FLOW THROUGH SAID MOTOR, SAID DRIVING SHAFT BEING OF AN ELECTRICALLY NONCONDUCTIVE MATERIAL WHICH ALLOWS A MECHANICAL OUTPUT WHILE PREVENTING SAID ELECTRICAL AND MAGNETIC EMANATED FIELD FROM EXTENDING BEYOND SAID HOUSING.