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US 4,475,335 AGranted
Free piston heat engines
AssigneeNational Research Development Corporation
InventorGordon Davey
Life of this patent
Estimating the term…
Abstract
A Stirling cycle heat engine, specially suitable for use in environments subject to acceleration or large temperature variations, including a free and reciprocating displacer piston fitted with a non-contact device which acts with increasing force to oppose further movement whenever the piston overshoots desired limits of its movement. The device may include a magnet which is carried by the piston shaft and which experiences repulsion from like poles of magnets carried by the shaft housing.
Claims6
A heat engine comprising:
- a free piston, adapted to execute reciprocatory movement of predetermined maximum stroke, and a non-contact movement-resisting device associated with said piston, said non-contact device being located so as to oppose further said reciprocatory movement with increasing force whenever said piston approaches either end of said stroke.
Dependencies are inferred from the claim text.