Abstract: A pressure container includes a first casing, a second casing, and a sealing member. A deformable membrane is mounted in the first casing, defining a water chamber that is communicated with a water inlet in the first casing. An air chamber is delimited by the deformable membrane and the second casing. The sealing member includes an inner ring, an outer ring surrounding the inner ring, and a connecting ring connecting the inner ring with the outer ring. The inner ring, the outer ring, and the connecting ring together define a first groove and a second groove respectively on two sides of the connecting ring. A flange on an end of the deformable membrane and an open end of the first casing are sealingly received in the first groove. An open end of the second casing is sealingly received in the second groove.

Abstract: This invention relates to a chair, particularly to one provided with a massage device positioned in a seat, backrest, thigh rest or armest. The massage device is composed of a frame and massage roller unit consisting of plural rows of massage rollers fixed in the frame. Two pivotal plates are provided with a center shaft hole for center shaft and two shaft holes respectively for a center shaft and two independent shafts to fit pivotally therein and string each row of the massage rollers. The center shaft is pivotally connected with the inner side of the frame, enabling the massage roller device rotate with the center shaft as a pivot. So when a user rests the body on the massage device, he/she shifts the body to get massage function by the massage surface of the massage roller device.