Adjustable length windshield wiper

An adjustable length windscreen wiper blade assembly comprising:

• a) An elongated main frame rod adapted to be attached to a windscreen wiper arm, the main frame rod having at least one end portion with an inverted, generally "U"-shaped transverse cross-section defining apposing sides;
• b) a plurality of spaced apart inwardly extending projections formed on said opposing sides of the inverted generally "U"-shaped cross-section portion of the main frame rod;
• c) a clip pin movably connected with the main frame rod such that a portion extends into the inverted, generally "U"-shaped cross-section portion;
• d) inwardly opening channels on said opposing sides of the inverted, generally "U"-shaped cross-section portion of the main frame rod;
• e) an elongated sub-frame rod having an inverted, generally "U"-shaped transverse cross-section defining opposing sides adapted to be slidably received in the inverted, generally "U"-shaped cross section portion of the main frame rod, the sub frame rod defining a plurality of teeth adapted to be engaged by the clip pin and a plurality of spaced apart notches along said opposing sides of the inverted, generally "U"-shaped cross-section located so as to engage at least one of the plurality of spaced apart projections;
• f) a rail extending outwardly from each side of the sub-frame rod so as to be slidably received in the inwardly opening channels;
• g) first means to attach a first wiper blade to the main frame rod;
• h) second means to attach a second wiper blade to the sub-frame rod such that the first and second wiper blades are in overlapping positions;
• and wherein sliding movement of the subframe rod in the main frame rod provides relative longitudinal movement between the blades.