Abstract: A system for removing oxygen from and around hospital beds for reducing the fire danger. A manifold having a plurality of sections is connected to and is supported from the frame. The sections are connected together by flexible joints and include a connection for attachment to an exhaust. A first plurality of suction tubes is connected to the manifold with their ends positioned adjacent the mattress for removing oxygen from and around the mattress. A second plurality of suction tubes is connected to the manifold and extend downwardly for removing oxygen from beneath the bed. Suction cups may be connected to the ends of the first suction tubes positioned adjacent the mattress. The suction cups are positioned adjacent the sides and the bottom of the mattress and are supported from the frame and springs.

Abstract: A compression refrigeration system having a compressor, a condenser, an evaporator, and a liquid refrigerant in which a capillary tube is positioned within an enclosure. The liquid refrigerant from the condenser is connected to the enclosure inlet and then flows to the inlet of the capillary tube and out of the capillary tube to the evaporator, whereby the refrigerant in the enclosure forms a heat exchange relationship with the exterior of the capillary tube for providing a self-regulating flow through the capillary tube. Improved charging of the system is provided by positioning the inlet to the capillary tube above the bottom of the enclosure and providing a refrigeration adding valve to the enclosure to insure that the enclosure is filled to a predetermined level in order to enter the capillary tube. Preferably, a reserve of liquid refrigerant is inserted into the enclosure above the capillary inlet for compensating for variations in density of the refrigerant.