Patent ID: 6842939
Filing Date: 2005-01-18
Classification: B60S,Y10S

Abstract:
1. A wiper pivot unit comprising: a pivot shaft having a proximal end and a distal end to which a wiper arm is fixed; a pivot holder fixed to a vehicle body; a bearing portion formed in the pivot holder and rotatably supporting the pivot shaft; and a locking member for restricting axial movement of the pivot shaft with respect to the bearing portion, wherein the pivot shaft includes a small-diameter section formed over a predetermined length from the distal end side, and a large-diameter section, which has a diameter larger than that of the small-diameter section, formed on the proximal end side, the large-diameter section having an end portion in the proximity of the small-diameter section, wherein the locking member is engaged with a predetermined frictional force against an external surface at the end portion of the large-diameter section, wherein when a thrust load of a predetermined value or more is applied to the pivot shaft toward the proximal end, restriction of axial movement of the pivot shaft by the locking member is removed, the pivot shaft starts moving with respect to the bearing portion, the locking member is moved to the small-diameter section, the frictional force is reduced, and the thrust load required to move the pivot shaft is reduced to substantially half of the thrust load that is required to start moving the pivot shaft with respect to the bearing portion.