Patent ID: 7980837

Claim:
A rotary piston machine comprising a cylinder provided with two ends to form a stator, inlet and outlet apertures disposed in the stator, and a piston comprising a rotor eccentrically mounted within the stator, and at least one vane connected to the rotor and in communication with the cylinder to form an expanding and contracting chamber as the piston rotates, the or each vane being connected to the rotor by a hinge, the piston being provided with sealing means sufficient to restrict the movement of gaseous/fluid matter between chambers during operation; characterized in that the sealing means comprises a flexible seal member with a mating lip positioned adjacent to each vane hinge such that each revolution of the eccentrically mounted piston causes each flexible seal member to come into contact with an inner cylinder wall of the cylinder sufficiently to prevent the escape of displaced gaseous/fluid matter past the vane hinge, wherein the flexible seal member contacts the cylinder wall and bends to form a lip seal resistive to the direction of pressurization.