Apparatus for changing wiping range of wiper

A link movement conversion mechanism for changing a back and forth wiping range of a window wiper blade mounted on one end of a wiper arm, said wiper arm mounted at an opposite end to a rotatable wiper shaft, said link movement conversion mechanism converting back and forth movement of a drive link driven by a rotating motor into a back and forth sweeping oscillation over the wiping range of the wiper blade, comprising:

• a first link integrally fixed to the wiper shaft proximate an end opposite to that end to which the wiper arm is mounted;
• a second link pivotally mounted to said first link, the drive link driven by the motor pivotally attached to said second link;
• an auxiliary link pivotally provided on said first link at a pivot point away from the pivotal mount of said second link;
• a first and a second stop means on said first link for establishing a first and a second link position for said second link which adjust one end of the wiping range;
• and
• a tension means for retaining said second link in one of said first and second link positions, said tension means attached at a first end to said second link and at a second end to said auxiliary link, wherein an edge of said second link and an edge of said auxiliary link are engaged such that rotation of one rotates the other and a swinging radius of said auxiliary link is smaller than a swinging radius of said second link.

A link movement conversion mechanism for changing a back and forth wiping range of a window wiper blade mounted on one end of a wiper arm, said wiper arm mounted at an opposite end to a rotatable wiper shaft, said link movement conversion mechanism converting back and forth movement of a drive link driven by a rotating motor into a back and forth oscillation over the wiping range of the wiper blade, comprising:

• a first link integrally fixed to the wiper shaft proximate an end opposite to that end to which the wiper arm is mounted;
• a second link pivotally mounted to said first link, the drive link driven by the motor pivotally attached to said second link;
• an auxiliary link pivotally provided on said first link at a pivot point away from the pivotal mount of said second link, an edge of said auxiliary link engaging an edge of said second link such that rotation of one rotates the other;
• a first and a second stop means on said first link for establishing a first and a second link position for said second link which define the wiping range;
• and
• a tension means for retaining said second link in one of said first and said second link positions, said tension means attached at a first end to said second link where said second link is pivotally mounted to said first link and at a second end to said auxiliary link at a point on a side of said auxiliary link opposite to said edge engaging said second link, wherein a swinging radius of said auxiliary link is smaller than a swinging radius of said second link.