Patent ID: 8075057

Claim:
A module for use with a chair having a seat portion supported by a support portion, for triggering movement of a person sitting thereon, the module being adapted to be attached to the chair between the seat portion and the support portion, the module comprising: a driving motor; a base platform adapted for fixed attachment to the seat portion; and an angled axis system (AAS) having a main rotary element having a main axis, and an auxiliary rotary element having an auxiliary axis coupled with the main rotary element so that the auxiliary axis and the main axis form an angle therebetween of 0.25-6 degrees, the main rotary element of the AAS is constituted by a main rod having a longitudinal axis substantially parallel to a base of the chair when the module is assembled thereto, so that when the main rotary element rotates about its main axis, the auxiliary rotary element also rotates about the main axis together with the main rotary element as a single body, the base platform being coupled to the auxiliary rotary element so that the rotation of the auxiliary axis moves the base platform entailing the seat portion to perform an oscillating combined rotary-tilting motion having an amplitude A defined by the angle, the motor being adapted to rotate either of the main rotary element or the auxiliary rotary element to provide a desired oscillation frequency f of 0.2-2 Hz so that the person seated on the seat portion is triggered to operate his joints and muscles to compensate for the movement in order to remain focused on a target, the frequency and the amplitude being such that the compensation of the movement by the person allows the person to remain focused on the target.