Drive mechanisms for motor road vehicle windscreen wiper systems

Claim 1

IN A MOTOR VEHICLE HAVING A FRONT COMPARTMENT AND A PASSENGER COMPARTMENT SEPARATED BY A PARTITION AND A WINDSCREEN ADJACENT SAID PARTITION, A WINDSCREEN WIPER DRIVE MECHANISM COMPRISING AN ELECTRIC WINDSCREEN WIPER DRIVE MOTOR MOUNTED FORWARDLY AND CENTRALLY OF SAID FRONT COMPARTMENT, A DRIVE CRANK MOUNTED ON SAID MOTOR FOR ROTATION THEREBY, A WIPER ARM PIVOT SHAFT MOUNTED ADJACENT SAID PARTITION, AN OSCILLATORY DRIVEN CRANK SECURED ON SAID PIVOT SHAFT REARWARDLY OF SAID PARTITION FOR MOVEMENT IN A SUBSTANTIALLY VERTICAL PLANE, A BELL CRANK LEVER MEMBER PIVOTALLY MOUNTED REARWARDLY OF SAID PARTITION TO TRANSMIT DRIVE FROM SAID DRIVE CRANK TO SAID RIVEN CRANK, A FIRST RECIPROCABLE LINK MEMBER CONNECTING ONE END OF SAID BELL CRANK LEVER MEMEBER TO SAID MOTOR DRIVE CRANK, AND A SECOND RECIPROCABLE LINK MEMBER CONNECTING THE OTHER END OF SAID BELL CRANK LEVER MEMBER TO SAID DRIVEN CRANK, SAID BELL CRANK LEVER BEING MOUNTED FOR PIVOTAL MOVEMENT IN A SUBSTANTIALLY HORIZONTAL PLANE, SAID FIRST RECIPROCABLE LINK MEMBER EXTENDING THROUGH AN OPENING IN SAID PARTITION AND THROUGH A TRANSVERSE SLIT IN A SHEET A FLEXIBLE MATERIAL SECURED TO SAID PARTITION TO OVERLIE SAID OPENING.