Interior and outer wiper of car

A windshield wiper assembly comprising:

• a motor;
• a worm gear driven by said motor;
• first and second conical gears coupled to said worm gear so as to be rotated thereby, each conical gear having a conical shaped opening therethrough about an axis;
• first and second coupling shafts each having a conical body for engagement with one of said conical openings so as to couple a shaft and conical gear together for rotation and each movable along said axis for engagement and disengagement;
• first and second wiper blades for mounting inside and outside a windshield;
• first and second link means respectively connecting said respective coupling shafts to respective wiper blades for causing reciprocal wiping movement of a wiper blade when the coupling shaft connected thereto is rotated;
• and
• a cam having a first position disengaged from said shafts so that said shafts engage and rotate with said conical gears to reciprocate both said first and second wiper blades, a second position in which said cam engages only one of said shafts to cause said shaft to move along said axis and disengage from said conical gear so that only the wiper blade reciprocates which is connected to the other coupling shaft, a third position in which said cam engages both of said shafts to cause both shafts to move along said axis and neither of said blades to reciprocate and a fourth position in which said cam engages only said other of said shafts to cause said other shaft to move along said axis and disengage from said conical gear so that only the wiper blade reciprocates which is connected to said one shaft.