Abstract: A seat assembly comprising generally an outer air cushion and an inner air cushion provided therein. The outer air cushion includes three rings superposed and fixed together, each ring having an air tap. A diameter of the lower ring, when taken in cross section, is larger than a diameter of the upper ring which is larger than a diameter of the middle ring. The inner air cushion is expanded and is limited within the outer air cushion when a user is seated thereon. The inner air cushion completely absorbs a weight of the user and is deformed according to a body of the user so that the user may feel comfortable.

Abstract: A cushion comprising two seat pieces combined with inside faces facing towards each other, and a plurality of coil spring members which connect the two seat pieces. Each of the seat pieces is a shallow circular plate having a smooth central concavity and includes internally a series of concentrically extending walls, a series of radially extending walls, and a plurality of appropriately spaced tubular walls with an upstanding cylinder formed inside. Each of the coil spring members is closely coiled at its two terminals and encompasses corresponding cylinders of the two seat pieces.