Extendable windshield wiper system

An extendable windshield wiper system, comprising:

• a wiper blade assembly having:
• a resilient material wiper blade;
• a wiper extension rod connected to the wiper blade, the wiper extension rod configured to move in an arc of rotation;
• and
• an actuation portion axially extending the wiper extension rod in an extension direction during a first portion of the arc of rotation and retracting the wiper extension rod in a retraction direction opposite to the extension direction during a second portion of the arc of rotation, the actuation portion including:
• a piston housing having a bore with an end of the wiper extension rod positioned within the bore, wherein the wiper extension rod is connected to a piston slidably disposed within the piston housing, wherein the piston housing includes a fluid portion proximal to a first side of the piston and a non-pressurized open-to-atmosphere portion proximal to a second side of the piston;
• a biasing member disposed within the non-pressurized open-to-atmosphere portion that biases the second side of the piston;
• a control valve in communication with a pressurized fluid, the control valve actuated to direct the pressurized fluid into and out of the fluid portion of the piston housing, wherein the pressurized fluid is provided to the control valve via a fluid supply line;
• and
• an accumulator connected to the fluid supply line and configured to provide a continuous controlled source of pressure to the control valve.