Motor-driven tooth brush

Claim 1

IN A MOTOR-DRIVEN TOOTHBRUSH, A SELF-CONTAINED POWER UNIT COMPRISING A TUBULAR CASING, A BATTERY POSITIONED WITHIN SAID CASING, A MOTOR HAVING A DRIVE SHAFT POSITIONED WITHIN SAID CASING, MANUAL MEANS LOCATED ON THE OUTER WALL OF SAID CASING FOR SELECTIVELY CONNECTING SAID MOTOR TO SAID BATTERY TO ACTUATE SAID MOTOR CAUSING ROTATION OF SAID DRIVE SHAFT, A CLEANING UNIT COMPRISING AN ATTACHMENT END, A WORK PIECE END AND AN ELONGATED RIGID SHANK PORTION HAVING A CROSS SECTION SUBSTANTIALLY LESS THAN THE CROSS SECTION OF SAID POWER UNIT, A TERMINAL END OF ONE OF SAID UNITS BEING PROVIDED WITH A PERIPHERAL SHOULDER, A TERMINAL END OF THE OTHER OF SAID UNITS BEING PROVIDED WITH A CIRCULAR RECESS ADAPTED TO FRICTIONALLY RECEIVE AND ENGAGE SAID SHOULDER, A WORK PIECE SHAFT ROTATABLY MOUNTED IN SAID WORK PIECE END ON AN AXIS TRANSVERSE TO THE LONGITUDINAL AXIS OF THE SHANK PORTION, SAID SHAFT HAVING A CHUCK MEANS FOR FRICTIONALLY AND REMOVABLY HOLDING A TOOTH CLERANING ELEMENT, DRIVEN MEANS FOR DRIVING SAID WORK PIECE SHAFT, COUPLING MEANS FOR REMOVABLY COUPLING SAID DRIVE SHAFT AND SAID DRIVEN MEANS, AND ATTACHMENT MEANS FOR REMOVABLY ATTACHING SAID CLEANING UNIT TO, AND IN COEXTENSIVE ALIGNMENT WITH SAID POWER UNIT, SAID ATTACHMENT MEANS COMPRISING A MULTIFURCATED CATCH PLATE HAVING A CENTRAL WEB MEMBER AND A PLURALITY OF RAISED FINGERS EXTENDING RADIALLY FROM SAID WEB MEMBER WITH EQUAL ANGULAR SPACING, SAID CATCH PLATE BEING SECURED TO A TERMINAL END OF ONE OF SAID UNITS, A PLURALITY OF RAISED, ARCUATE TINES CORRESPONDING TO SAID FINGERS CIRCULARLY DISPOSED ABOUT THE CENTER OF ONE TERMINAL END OF THE OTHER UNIT AND SPATIALLY ORIENTED ON SAID TERMINAL END IN RELATIONSHIP TO SAID FINGERS WHEREBY THE RELATIVE ROTATION OF ONE UNIT ABOUT ITS LONGITUDINAL AXIS WILL PERMIT THE ENGAGEMENT OF SAID FINGERS, AND TINES WITH SAID TINES TRANSVERSELY ENGAGING THE UNDERSIDE OF SAID FINGERS.