PNEUMATIC WINDING MECHANISM FOR A TIMEPIECE COMPRISING A MECHANICAL ENERGY SOURCE
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United States of America Patent
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app pub date -
Jun 20, 2013
filing date -
Dec 21, 2010
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Abstract
A pneumatic mechanism for a timepiece, is disclosed, which comprises a mechanical energy source, the pneumatic mechanism being arranged to recharge the mechanical energy source, and comprising a sealed chamber capable of alternately expanding and contracting in volume as a function of variations in the surrounding temperature. The sealed chamber may contain a mixture of reactants comprising a metal alloy arranged in contact with a gas and capable of undergoing at least one phase change as a function of variations in the surrounding temperature. The mixture of reactants advantageously has a coefficient ΔP/ΔT substantially higher than about 0.01 bar·° C.−1 and with operating ranges between about 0 and about 50° C. in temperature and between about 1 and about 50 bar in pressure. Furthermore, the minimum possible difference between temperatures associated with consecutive contrariwise variations in the surrounding temperature may be smaller than or equal to about 4° C.
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