Windshield wiper

Claim 1

A WINDSHIELD WIPER ASSEMBLY COMPRISING A SUBSTANTIALLY HORIZONTAL ONE-PIECE, GENERALLY U-SHAPED BRACKET PLATE HAVING BEARING BRACKETS PROJECTING FROM ITS OPPOSITE ENDS AND HAVING A FLAT INTERMEDIATE PORTION ADAPTED TO BE SECURED TO THE TRANSVERSE VERTICAL FIREWALL OF A MOTOR VEHICLE, A GEAR HOUSING RIGIDLY SECURED TO THE INTERMEDIATE PORTION OF SAID BRACKET PLATE, RESPECTIVE DRIVE SCREWS JOURNALED BETWEEN THE BEARING BRACKETS AND THE RESPECTIVE SIDE WALLS OF THE GEAR HOUSING, RESPECTIVE BEVEL GEARS ON THE ENDS OF THE DRIVE SCREWS INSIDE SAID GEAR HOUSING, A DRIVING BEVEL GEAR MOUNTED IN SAID GEAR HOUSING MESHING WITH SAID FIRST-NAMED BEVEL GEARS, EACH DRIVE SCREW HAVING A CONTINUOUS THREAD COMPRISING CROSSED FORWARD AND REVERSE HELICAL GROOVE PORTIONS CONNECTED AT THEIR ENDS BY REVERSING GROOVES, A CARRIAGE MEMBER ENGAGING EACH DRIVE SCREW, A DRIVING SHAFT JOURNALED IN EACH CARRIAGE MEMBER, AN UPWARDLY EXTENDING ARM SECURED TO EACH CARRIAGE MEMBER, A WINDSHIELD WIPER SHAFT JOURNALED IN THE TOP PORTION OF EACH ARM, MEANS DRIVINGLY COUPLING EACH DRIVING SHAFT TO THE ADJACENT WINDSHIELD WIPER SHAFT, A HORIZONTAL RACK BAR MOVABLY MOUNTED ADJACENT AN END OF EACH DRIVE SCREW, A PINION GEAR ON EACH DRIVING SHAFT AT TIMES MESHINGLY ENGAGEABLE WITH THE ADJACENT RACK BAR, WHEREBY TO OSCILLATE THE DRIVING SHAFT WHEN THE ASSOCIATED CARRIAGE MEMBER MOVES TOWARD AND RETURNS FROM THE OUTER REVERSING GROOVE OF THE ASSOCIATED DRIVE SCREW, A DRIVE MOTOR COUPLED TO SAID DRIVING BEVEL GEAR, A SOURCE OF CURRENT, CIRCUIT MEANS CONNECTING SAID DRIVE MOTOR TO SAID SOURCE OF CURRENT AND INCLUDING FIRST, SECOND AND THIRD PARALLEL-CONNECTED SWITCHES, MANUALLY OPERATED MEANS CONTROLLING SAID FIRST SWITCH, MEANS ON ONE RACK BAR CONTROLLING THE SECOND SWITCH, MANUALLY OPERATED MEANS CONTROLLING THE MOVEMENT OF THE RACK BARS, VERTICAL LOCKING PINS SILDABLY MOUNTED IN THE CARRIAGE MEMBERS AND BEING LOCKINGLY ENGAGEABLE WITH THE RESPECTIVE DRIVING SHAFTS TO PREVENT ROTATION THEREOF, SAID LOCKING PINS EACH BEING FORMED WITH A RELEASE NOTCH, MEANS TO ELEVATE THE LOCKING PINS SUFFICIENTLY TO MOVE THE RELEASE NOTCHES ADJACENT THE DRIVING SHAFTS TO RELEASE THE DRIVING SHAFTS FOR ROTATION RESPONSIVE TO THE MOVEMENT OF THE CARRIAGE MEMBERS TO POSITIONS ADJACENT THE RACK BARS, MANUALLY OPERATED MEANS TO ELEVATE SAID RACK BARS, THE RACK BARS BEING EACH FORMED WITH A PAIR OF VERTICALLY SPACED, HORIZONTAL LONGITUDINALLY EXTENDING GROOVES, AND A SUPPORTING PROJECTION ON EACH CARRIAGE MEMBER LOCATED TO SILDABLY ENGAGE IN ONE OR THE OTHER OF THE GROOVES OF THE ASSOCIATED RACK BAR IN ACCORDANCE WITH THE RAISED OR LOWERED POSITIONS OF THE RACK BARS.