Patent ID: 8016925

Claim:
A gas delivery apparatus, comprising: a compressor for drawing ambient air into the apparatus; means for producing product gas having an increased concentration of oxygen relative to that of the ambient air; an apparatus outlet for delivering product gas to a user; and the producing means including: at least two adsorber beds, each bed including an inlet end for receiving ambient air and discharging adsorbed nitrogen as a waste gas and an outlet end for communicating and delivering the product gas to the apparatus outlet; first and second unitary manifolds on which the beds are directly mounted at their inlet ends and outlet ends, respectively, wherein the first manifold is configured to detachably mount the compressor, and wherein the first manifold includes a first internally formed channel for providing fluid communication of the bed inlet ends with the compressor and the second manifold includes an internally formed channel for providing fluid communication of the bed outlet ends with the apparatus outlet; and a unitary bolt centrally disposed between the beds and manifolds and engaging at least the second manifold and the compressor and passing through the first manifold to detachably retain and thereby support all of the beds, manifolds and compressor as an integrated operating unit.