Lifter device

A lifter device comprising:

• an output shaft configured to rotate by receiving transmission of rotational power from an operation handle and configured to raise and lower a seat;
• a support member configured to support the output shaft such that the output shaft is rotatable;
• an input member coupled to the operation handle and configured to be operated to rotate around an axis of the output shaft;
• a feed portion configured to transmit forward and reverse rotation of the input member to the output shaft;
• a lock portion configured to lock the rotation of the output shaft with respect to the support member;
• and
• a friction generating portion configured to apply a frictional force to the rotation of the output shaft, the friction generating portion including:
• an elastic body provided between the output shaft and the support member;
• a rotating cam connected to the input member;
• a rotating member configured to rotate integrally with the output shaft;
• a clutch portion configured to be supported by the support member, configured to be pushed in a radial direction by rotation of the rotating cam, and configured to press the elastic body in a thrust direction parallel to the axis of the output shaft between the clutch portion and the rotating member to generate friction;
• and
• a guide member configured to support the clutch portion to the support member, wherein the elastic body is positioned between the guide member and the rotating member,
• wherein the rotating cam is a switching structure of switching to:
• a friction-suppression state, in which generation of friction caused by the elastic body is suppressed, by not pushing the clutch portion in the radial direction when the operation handle is in a neutral position and when the operation handle is turned in a direction of raising the seat from the neutral position;
• and
• a friction-on state, in which friction caused by the elastic body is generated, by pushing the clutch portion in the radial direction when the operation handle is turned in a direction of lowering the seat from the neutral position.