Patent ID: 8887443

Claim:
A window regulator, comprising: a lift arm whose one end portion is rotatably supported and whose another end portion is guided by a guide of a lift arm bracket extending in a direction intersecting with a direction of opening and closing window glass; and an equalizer arm whose middle portion is pivotally fitted into a through hole formed in a central portion of the lift arm in such a manner that the equalizer arm and the lift arm form a shape resembling a letter X, whose one end portion supports the lift arm bracket, and whose another end portion is guided by a guide of an equalizer atm bracket parallel to the guide of the lift arm bracket, the lift arm moving pivotally to open and close the window glass supported by the lift arm bracket, wherein the lift arm includes: an annular protrusion formed around the through hole; and at least one stress-dispersing elongated protrusion formed in a region located in a vicinity of the through hole and on a side toward said one end portion of the lift arm, wherein the stress-dispersing elongated protrusion is extended in a rectilinearly oblique direction, with respect to a longitudinal direction of the lift arm, in such a manner that one end of the stress-dispersing elongated protrusion is connected to the annular protrusion, whereas another end of the stress-dispersing elongated protrusion reaches an edge of the lift atm, and wherein said another end of the stress-dispersing elongated protrusion extends to end at the edge of the lift arm.