Patent ID: 8186638

Claim:
An apparatus comprising: a supporting body; a rotating body rotatably situated in the supporting body to rotate at least between a standard position where the rotating body is retained inside the supporting body and a deployed position where the rotating body projects outwardly from the supporting body, through an intermediate position; a gear part attached to the rotating body; a biasing device attached to the rotating body for applying a biasing force to the rotating body in a direction of returning the rotating body to the standard position; a damping device fixed to the supporting body, for applying a damping force to the rotating body when the rotating body returns to the standard position; a speed switching device provided between the damping device and the rotating body, for changing a rotational speed of the rotating body from the deployed position to the intermediate position different from that from the intermediate position to the standard position in a return rotational movement of the rotating body; wherein the speed switching device comprises a first gear disposed on the damping device for applying the damping force of the damping device to the rotating body, said first gear having a first large gear part having a first large radius of curvature and a first small gear part having a first small radius of curvature that is smaller than the first large radius of curvature and sharing a single axis of rotation at different positions in an axial direction; and a second gear disposed on a side of the supporting body, and engaging the first gear, said second gear having a second large gear part having a second large radius of curvature and a second small gear part having a second small radius of curvature that is smaller than the second large radius of curvature and sharing a single axis of rotation at different positions in the axial direction; and the gear part engages the second small gear part; the second large gear part is arranged to partly engage the first small gear part; and the second small gear part is arranged to partly engage the first large gear part.