Patent ID: 8826595

Claim:
A window regulator comprising, a drive gear connected to a drive motor, an elongate push-pull member, which is open ended, meshes with the drive gear and can be pushed and pulled by bidirectional rotations of the drive gear, a carrier which is connected with one end of the elongate push-pull member and is connected with a window glass, and a guide rail which guides the elongate push-pull member and the carrier in a drive path, wherein: the drive path is a path through which the elongate push-pull member moves, the drive path extending upward from a meshing portion at which the drive gear meshes with the elongate push-pull member to a carrier mounting portion at which the carrier is connected with the elongate push-pull member, and an idle path is a path provided for retreating a portion of the elongate push-pull member which is not used when the carrier is moved down, the idle path having a curved orbit; the window regulator further comprises a frame in which a means for fixing and supporting the drive motor, a means for fixing and supporting the guide rail, a means for holding an orbit of the elongate push-pull member in the idle path, and a means for mounting on an object are integrally formed; the elongate push-pull member is constituted by a rack belt having a rack-teeth surface, a first belt side surface, a second belt side surface, and a belt back surface and being arranged in such a manner that the rack-teeth surface faces to an inner side of the curved orbit of the idle path; the means for holding the elongate push-pull member in the idle path is constituted by an idle-guide portion through which the elongate push-pull member is inserted, the idle-guide portion is constituted by a curved-orbit guide portion which is formed in a curved shape, the curved-orbit guide portion is constituted by a rectangular-pipe member of a rectangular cross-sectional shape, having an inner-peripheral guide wall, a first side guide wall, a second side guide wall, and an outer-peripheral guide wall, which respectively guide the rack-teeth surface, the first belt side surface, the second belt side surface, and the belt back surface; the inner-peripheral guide wall and the outer-peripheral guide wall are formed to broaden the curved-orbit guide portion in a vicinity of a tail-end opening of the curved-orbit guide portion; and a gap between the rack belt and the inner-peripheral guide wall is set greater than a gap between the rack belt and the outer-peripheral guide wall at the tail-end opening, and a position at which broadening of the curved-orbit guide portion begins in the inner-peripheral guide wall is more distant from the tail-end opening than a position at which broadening of the curved-orbit guide portion begins in the outer-peripheral guide wall.