Abstract: A rotary heat driven device comprising a rotor having sections thereof mounted on a common shaft one within and off center of each of the associated axially aligned chambers. One section comprises an engine, the other a compressor and the third a liquid pump. Each section of the rotor has at least one reciprocating vane mounted to extend through and diagonally out of each of the rotor sections with vane member positioned on the ends of each vane for following along the surface of an oblong opening in each of the chambers.

Abstract: An engine or heat pump for a refrigeration system employing a first elongated expansion-compression device defining a pair of chambers, each having a linearly movable piston therein which are axially interconnected by a hollow cylinder. A second expansion-compression device is mounted within the cylinder. Conduit means are provided, one extending into each end of the first device, through the associated piston and into the cylinder. The first device forces working fluid received through the device to provide fluid under relatively high pressure to the power and work loops of a refrigeration system, while the second device actuated by the first device draws relatively low pressure fluid from the system and returns it under pressure to a source.