Patent ID: 8827938

Claim:
A chair type massage machine, comprising: a seat portion; a backrest portion that reclines at a back portion side of the seat portion about a reclining center; a rocking mechanism portion that swings the backrest portion in a reclining state and the seat portion about a rocking center, which is apart from the reclining center, wherein the rocking mechanism portion comprises a speed changing portion that lowers a swinging speed of the seat portion and the backrest portion as the seat portion and the backrest portion approach front and back track end portions; wherein the speed changing portion comprises: a decelerator and a link portion, wherein an output shaft of the decelerator rotates at a constant speed by a constant rotation of a motor, and wherein the link portion converts a rotation movement of the output shaft into a reciprocating movement of the seat portion and the backrest portion and changes the reciprocating movement speed; a fixed frame; and a movable frame, wherein the movable frame supports the backrest portion and the seat portion and reciprocates with respect to the fixed frame; wherein the link portion comprises: a rotation member that rotates about a rotation center with a rotation of the output shaft, an eccentric shaft attached to the rotation member eccentrically with respect to the rotation center, and a crank member attached to the eccentric shaft, wherein the crank member converts a movement of the eccentric shaft about the rotation center into a reciprocating movement of the movable frame.