Patent ID: 8312717

Claim:
An externally heated engine comprising: a) a piston adapted for movement within a first cylinder, said piston having a first side and a second side opposite the first side, the first side and the first cylinder defining a working chamber and the second side and the first cylinder defining an opposite chamber containing an opposing fluid; b) a displacer adapted for movement within a second cylinder, said displacer having a first side and a second side opposite the first side, the first side of the displacer and the second cylinder defining a cold chamber and the second side of the displacer and the second cylinder defining a hot chamber; c) a closed fluid path between the first and second cylinders, the closed fluid path including a working fluid, the working fluid capable of moving between the working chamber, the cold chamber and the hot chamber; d) a regenerator within the closed fluid path; e) a heat source for heating the working fluid; f) a link adapted to cause reciprocation of the piston; g) a first disk connected to a first shaft section; h) a second disk connected to a second shaft section; i) a yoke connected to the first disk and the second disk, the yoke adapted for positional adjustment in the radial direction with respect to the first disk and the second disk; j) the link connected to the yoke such that positional adjustment of the yoke causes the position of the piston to change within the cylinder.