Hand drawn vehicle with power assist

Claim 1

POWER DRIVE MECHANISM FOR INTERMITTENTLY DRIVING A HAND DRAWN VEHICLE OF A CHARACTER INCLUDING A SUPPORTING WHEEL AND A DRAFT HANDLE, AN AXLE MOUNTING SAID WHEEL, A REVERSIBLE ELECTRIC MOTOR, AN ELECTRIC CIRCUIT FOR CONNECTING SAID MOTOR TO A SOURCE OF ELECTRIC CIRCUIT FOR NORMALLY OPEN ON-OFF SWITCH IN SAID ELECTRIC CIRCUIT MANUALLY ACTUABLE TO CLOSE THE CIRCUIT FOR OPERATING THE MOTOR IN FORWARD OR REVERSE DIRECTIONS, A BI-DIRECTIONAL CLUTCH ACTUABLE DURING OPERATION OF THE MOTOR TO CONNECT THE MOTOR TO SAID WHEEL FOR DRIVING THE WHEEL, AND A NORMALLY CLOSED SWITCH IN SAID CIRCUIT OPERABLE IN RESPONSE TO A PREDETERMINED AXIS TORQUE SPEED TO OPEN THE CIRCUIT AND STOP THE MOTOR SO AS TO DISENGAGE THE CLUTCH AND PERMIT FREE WHEELING OF THE WHEEL.