Patent ID: 7608017

Claim:
A balance exercise machine comprising: a seat on which a trainee sits; a swing mechanism that swings the seat with a swing motion in an anteroposterior direction and a swing motion in a widthwise direction; a controller that controls the swing mechanism, wherein moving speed in the swing motion of the seat in the anteroposterior direction is twice as fast than that in the widthwise direction; and origin of the swing motion of the seat in the widthwise direction is set from a position discrepant within a quarter-cycle or a half-cycle from origin of the swing motion of the seat in the anteroposterior direction to a position coinciding with the origin of the swing motion of the seat in the anteroposterior direction; an extendable and contractible mechanism that varies a distance between the seat and the swing mechanism by extension or contraction thereof so as to vary a stroke of a swing motion of the seat, wherein said controller further controls the extendable and contractible mechanism; a supporting unit that supports the swing mechanism rotatably around a predetermined rotation axis; a pedestal that is to be established on a floor and supports the supporting unit rotatably around a first horizontal axis, and wherein the extendable and contractible mechanism comprises: a first inclination mechanism that is provided between the pedestal and the supporting unit, and varies an inclination angle of the rotation axis of the swing mechanism in a vertical plane; and a second inclination mechanism that is provided between the swing mechanism and the seat, and varies an inclination angle of the seat around a rotation axis of the seat.