“Improvements to reciprocating positive displacement compressors“ International Patent Number WO 2008/026232 A1 date 06.08.2007 – Estensione internazionale del brevetto dal titolo “Perfezionamenti ai compressori volumetrici alternativi”. Brevetto per Invenzione Industriale N° RM2006A000461 del 31 agosto 2006

A positive displacement reciprocating compressor comprising a non-conventional crank mechanism which eliminates the amount of frictional force between the wall of the piston and the wall of the cylinder, whose characteristic feature is tohave a planet made of sintered material, with self-lubrication properties, allowing to eliminate bushings or similar additional elements. An economical and structurally simple lubrication system, which preferably comprises a classical link rod/crank mechanism, utilizes the mechanical energy provided by the drive shaft of the compressor and sends the lubricant (oil) in a precise manner to the surfaces that need to be lubricated. This oil is easily retained by the very small grains of the sintered material. Moreover, a valve system based on a single plate simplifies the structure of the cylinder unit.