Seat or stool with back and armrests on column is joined to column via time-controlled joint to return seat to balanced center position only by employing pelvic or leg muscles.

摘要

Devices connected to seat or stool or the backrest cause the user to execute active or passive movements. The seat etc moves in all directions as coupled by joint to a center column and designed with the center or gravity above the joint so the seat can be held in its center balanced position by the pelvic or leg muscles of the user. The interval between seat and joint can be adjusted as can the deflection of the joint. Added weights are fixed within the seat etc at radial distance from the center column so as to impede the return of the seat to its balanced position. All weights are of identical weight and distance from the center column for adjustable deflection. The joint can be locked out on a time basis. In one variant, a weight between seat and joint pulls the seat out of balance, this weight rotating round a vertical axis coaxial with the column axis.