Expansion engine

Abstract

An expansion engine fixed to a flange so as to extend into a vacuum tank comprises an outer cylinder inserted in said vacuum tank and having its proximal end opening into the atmosphere, an inner cylinder removably inserted from its distal side into said outer cylinder through said opening, a piston capable of reciprocating inside said inner cylinder and having an exhaust valve, an intake valve mechanism disposed on the distal side of said inner cylinder and capable of moving together with said inner cylinder, and O-rings disposed between said inner and outer cylinders to seal the interface between said cylinders airtightly.

Dependencies are inferred from the claim text.