Seat lifter apparatus for vehicle

A seat lifter apparatus for a vehicle, comprising:

• a link mechanism supporting a seat at an upper side of the link mechanism via a link member which is rotatably provided;
• a sector gear integrally rotating with the link member by sharing a rotation shaft with the link member;
• a pinion gear meshed with the sector gear;
• an operation handle operated to rotate in a first direction and a second direction by including a neutral position;
• and
• a rotation control apparatus disposed between the pinion gear and the operation handle,
• the rotation control apparatus including:
• a ratchet wheel integrally rotating with the pinion gear by sharing a rotation shaft with the pinion gear;
• an operation member arranged at a position coaxial with the ratchet wheel to rotate on a basis of a rotation operation of the operation handle;
• an engagement lever configured to restrict a rotation of the pinion gear by engaging with the ratchet wheel;
• and
• a drive lever driving and rotating the pinion gear in a direction where the seat moves upward by integrally rotating with the operation member in a state where the drive lever engages with the ratchet wheel based on the rotation operation of the operation handle in the first direction,
• the engagement lever disengaging from the ratchet wheel by the rotation of the pinion gear in a case where the seat moves upward,
• the rotation control apparatus further including an engagement lever control piece and a drive lever control piece which cause the engagement lever and the drive lever respectively to disengage from the ratchet wheel based on the rotation operation of the operation handle in the second direction,
• the engagement lever control piece restricting an operation of the engagement lever disengaging from the ratchet wheel in a case where the operation handle is at the neutral position.