Lifter device

A lifter device comprising:

• a pinion gear configured to mesh with an input gear of a link mechanism that lifts and lowers a seat;
• and
• a rotation control device configured to control rotation of the pinion gear,
• wherein the rotation control device includes:
• a rotation shaft configured to rotate in synchronization with the pinion gear;
• a support member rotatably supporting the rotation shaft;
• a rotation drive mechanism configured to rotate the rotation shaft so as to correspond to an operation of an operation handle for lifting and lowering the seat;
• a lock mechanism configured to lock the rotation of the rotation shaft at an operation end position of the operation handle;
• and
• a stopper configured to restrict the rotation of the rotation shaft at an upper limit position or a lower limit position that restricts the lifting and lowering of the seat,
• wherein the stopper includes:
• a rotation shaft-side protrusion provided to an outer circumferential surface of the rotation shaft;
• an engagement member slidably provided to the outer circumferential surface of the rotation shaft, and engaged with the rotation shaft-side protrusion in a circumferential direction of the rotation shaft when the engagement member is at a predetermined engagement position in a rotation direction of the rotation shaft;
• and
• a support member-side protrusion provided to the support member, and engaged with the engagement member in the circumferential direction when the engagement member is at the engagement position, and
• wherein, when the seat is at the upper limit position or the lower limit position, the rotation of the rotation shaft is restricted by becoming a state where the engagement member is at the engagement position and the engagement member is interposed between the rotation shaft-side protrusion and the support member-side protrusion.