Abstract: A multicylinder refrigerant compressor is disclosed having double-ended pistons operating in aligned cylinder bores of a cylinder block to discharge refrigerant from the opposite ends thereof to discharge chambers formed in opposite ends of the compressor. A muffler arrangement is completely formed within the compressor and comprises a separate attenuation chamber ported at one of two opposing ends thereof directly to each discharge chamber. Each attenuation chamber is formed within and as an integral part of the cylinder block between two adjacent cylinder walls thereof and an elongated attenuation passage directly connects the attenuation chambers at their other end. The attenuation passage is also formed in and as an integral part of the cylinder block and extends between the two aforesaid adjacent cylinder walls.

Abstract: A compact lightweight multicylinder swash plate compressor is disclosed having a metallic double-ended piston with piston heads reciprocated in aligned metallic cylinder bores. Each piston head has a diametrical dimension substantially less than the diametrical dimension of its respective bore to provide a substantial annular space therebetween and a solid seal-support ring of slippery material is expanded over each piston head and contracts into a circumferential groove therein. Each ring is sufficiently thick that the memory recovery thereof after further contraction forced by a tool causes the ring to sealingly engage its respective bore immediately after assembly with its piston head therein. The metal of the piston head on opposite sides of the groove is thereby prevented from touching the metal of its respective bore throughout its reciprocation in the bore. Each ring groove is formed with a plurality of projections which are spaced about and project outward from the bottom thereof.