Wiper system with extendible wiper arm

A windshield wiper system comprising:

• a wiper arm shaft;
• drive means coupled to said wiper arm shaft for imparting reciprocating movement to said wiper arm shaft between first and second reversing positions;
• a wiper arm having a first section by which said wiper arm is mounted on aid wiper arm shaft for pendulum-motion of said wiper arm as said wiper arm shaft undergoes reciprocating movement and a second section movable relative to said first section of said wiper arm along the longitudinal axis of said wiper arm;
• a wiper blade attached to said second section of said wiper arm;
• and mounting means for attaching said second section of said wiper arm to said first section of said wiper arm for pendulum-motion of said wiper blade with said wiper arm and movement of said wiper blade with said second section of said wiper arm along the longitudinal axis of said wiper arm during pendulum-motion of said wiper arm, said mounting means including:
• (a) a stroking shaft coaxial with said wiper arm shaft and which moves in the same direction as said wiper arm shaft while said second section of said wiper arm moves longitudinally outward from said first section of said wiper arm,
• (b) means connected between said second section of said wiper arm and said stroking shaft for imparting movement to said second section of said wiper arm along the longitudinal axis of said wiper arm in response to movement of said stroking shaft,
• (c) a stroking swivelling leer attached to said stroking shaft for pivotal movement of said stroking shaft with said stroking swivelling lever,
• (d) a coupler connected at a first end to said stroking swivelling lever,
• (e) an inebriate lever mounted for swivellable movement between first and second reversing positions and having a first end attached to a second end of said coupler and a second end coupled to said drive means,
• said coupler passing through a dead center position while said intermediate lever moves between said first and said second reversing positions of said intermediate lever at which dead center position longitudinal movement of said second section of said wiper arm is reversed.

A windshield wiper system comprising:

• a wiper arm shaft;
• a wiper arm having a first section by which said wiper arm is mounted on aid wiper arm shaft for pendulum-motion of said wiper arm as said wiper arm shaft undergoes reciprocating movement and a second section movable relative to said first section of said wiper arm along the longitudinal axis of said wiper arm;
• a wiper blade attached to said second section of said wiper arm;
• mounting means or attaching said second section of sad wiper arm to said first section of said wiper arm for pendulum-motion of said wiper blade with said wiper arm and movement of said wiper blade with said second section of said wiper arm along the longitudinal axis of said wiper arm during pendulum-motion of said wiper arm, said mounting means including:
• (a) a stroking shaft coaxial with said wiper arm shaft,
• (b) means connected between said second section of said wipe r arm and said stroking shaft for imparting movement to said second section of said wiper arm along the longitudinal axis of said wiper arm in response to movement of said stroking shaft,
• (c) a stroking swivelling leer attached to said stroking shaft for pivotal movement of said stroking shaft with said stroking swivelling lever,
• (d) a coupler connected at a first end to said stroking swivelling lever,
• (e) an intermediate lever mounted for swivellable movement between first and second reversing positions and having a first end attached to a second end of said coupler and a portion between its swivel point and said first end of said intermediate lever which is congruent with the longitudinal axis of said coupler,
• and drive means coupled to a second end of said intermediate lever and to said wiper arm shaft for imparting reciprocating movement to said wiper arm shaft between first and second reversing positions and including;
• (a) a wiper arm shaft swivelling lever fixed to and pivotal with said wiper arm shaft, and
• (b) a drive rod connected between said intermediate lever and said wiper arm shaft swivelling lever and spaced from said coupler along the axis of said wiper arm shaft on an opposite side of said wiper arm shaft swivelling lever form said coupler,
• said coupler passing through a dead center position while said intermediate lever moves between said first and said second reversing positions of said intermediate leer at which dead center position longitudinal movement of said second section of said wiper arm is reversed.

A windshield wiper system comprising:

• a wiper arm shaft;
• a wiper arm having a first section by which said wiper arm is mounted on said wiper arm shaft for pendulum-motion of said wiper arm as said wiper arm shaft undergoes reciprocating movement and a second section movable relative to said first section of said wiper arm along the longitudinal axis of said wiper arm;
• a wiper blade attached to said second section of aid wiper arm;
• mounting means or attaching said second section of said wiper arm to said first section of said wiper arm for pendulum-motion of said wiper blade with said wiper arm and movement of said wiper blade with said second section of said wiper arm along the longitudinal axis of said wiper arm during pendulum-motion of said wiper arm, said mounting means including:
• (a) a stroking shaft coaxial with said wiper arm shaft,
• (b) means connected between said second section of said wiper arm and said stroking shaft for imparting movement to said second section of said wiper arm along the longitudinal axis of said wiper arm in response to movement of said stroking shaft,
• (c) a stroking swivelling lever attached to said stroking shaft for pivotal movement of said stroking shaft with said stroking swivelling lever,
• (d) a coupler connected at a first end to said stroking swivelling lever
• (e) an intermediate lever mounted for swivellable movement between first and second reversing positions, and having a first end attached to a second end of said coupler and a portion between its swivel point and said first end of said intermediate lever which is congruent with the longitudinal axis of said coupler,
• and drive means coupled to a second end of said intermediate lever and to aid wiper arm shaft for imparting reciprocating movement to said wiper arm shaft between first and second reversing positions and including;
• (a) a wiper arm shaft swivelling lever fixed to and pivotal with said wiper arm shaft and mounted for swivellable movement in the same direction as said intermediate lever, and
• (b) a drive rod connected between said intermediate lever and said wiper arm shaft swivelling lever
• said coupler passing through a dead center position while said intermediate lever moves between said first and said second reversing positions of said intermediate lever at which dead center position longitudinal movement of said second section of said wiper arm is reversed.

A windshield wiper system comprising:

• a wiper arm shaft;
• a wiper arm having a first section by which said wiper arm is mounted on said wiper arm shaft for pendulum-motion of said wiper arm as said wiper arm shaft undergoes reciprocating movement nd a second section movable relative to said first section of said wiper arm along the longitudinal axis of said wiper arm;
• a wiper blade attached to said second section of said wiper arm;
• mounting means for attaching said second section of said wiper arm to said first section of said wiper arm for pendulum-motion of said wiper blade with said wiper arm and movement of said wiper blade with said second section of said wiper arm along the longitudinal axis of said wiper arm during pendulum-motion of said wiper arm, said mounting means including:
• (a) a stroking shaft coaxial with said wiper arm shaft,
• (b) means connected between said second section of said wiper and said stroking shaft for imparting movement to said second section of said wiper arm along the longitudinal axis of said wiper arm in response to movement of aid stroking shaft,
• (c) a stroking swivelling lever attached to said stroking shaft for pivotal movement of said stroking shaft with said stroking swivelling lever,
• (d) a coupler connected at a first en to said stroking swivelling lever,
• (e) an intermediate lever mounted for swivellable movement between first and second reversing positions and having a first end attached to a second end of said coupler and potion between its swivel point and said first end of said id intermediate lever which is congruent with the longitudinal axis of said coupler,
• and drive means, coupled to a second end of said intermediate lever and to said wiper arm shaft for impacting reciprocating movement to said wiper arm shaft between first and second reversing positions, said drive means including a drive motor, a crank at the output of said drive motor, a drive rod connected between said crank and said intermediate lever and a wiper arm shaft swivelling lever fixed to and pivotal with said wiper arm shaft and swivellable in the same direction as said intermediate lever,
• said coupler passing through a dead center position while said intermediate lever moves between said first and said second reversing portions of said intermediate lever at which dead center position longitudinal movement of said second section of said wiper arm is reversed.