| 摘要 |
A battery of side-by-side tubes constructed of a material having a high coefficient of expansion is provided and one set of ends of the tubes are stationarily supported from a suitable base. A power shaft is rotatably journalled on an axis stationary relative to the base and the shaft includes a ratchet wheel for each tube. Each tube has a pair of ratchet paws operatively associated therewith engaged with the corresponding ratchet wheel through suitable motion transmitting structure and the expansion and contraction of each tube above a predetermined magnitude is operative to rotate the shaft. A hot air manifold and a cold air manifold extend along one set of ends of the tubes and valve structure is provided for alternately communicating the interior of the manifolds with the interiors of the tubes, the valve structures being alternately driven through open and closed positions from the shaft and the remote ends of the tubes being provided with damper controlled air discharge structure.
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