PNEUMATIC WINDING MECHANISM FOR A TIMEPIECE COMPRISING A MECHANICAL ENERGY SOURCE

摘要

#CMT# #/CMT# The mechanism has a sealed enclosure (20) containing a mixture of reactants comprising metal alloy arranged in contact with gas. The reactant mixture has pressure coefficient greater than 0.01 bar or temperature coefficient equal to per degree Celsius within an operating temperature range between 0 and 50 degree Celsius and an operating pressure range between 1 and 50 bars. The reactant mixture is selected such that minimum possible temperature difference associated with consecutive opposite variations in ambient temperature in the enclosure is less than or equal to 4 degree Celsius. #CMT# : #/CMT# The gas is dihydrogen or dideuterium gas. An independent claim is also included for a timepiece comprising a pneumatic mechanism. #CMT#USE : #/CMT# Pneumatic mechanism for winding a barrel spring of a timepiece (claimed) i.e. wristwatch. Can also be used for winding a barrel spring of a clock. #CMT#ADVANTAGE : #/CMT# The winding mechanism is configured such that pressure reigning in the sealed enclosure varies based on variation in ambient temperature in the enclosure so as to supply energy to a mechanical energy source irrespective of dimensions of the timepiece. The winding mechanism has reduced encumbrance so as to be easily integrated in the timepiece. The reactant mixture is selected such that minimum possible temperature difference associated with consecutive, opposite variations in ambient temperature in the enclosure is less than or equal to 4 degree Celsius, such that properties of the winding mechanism are adapted to current utilization conditions of the timepiece and that the winding mechanism is more sensitive to variation in ambient temperature so as to improve the operation and efficiency of the winding mechanism. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a perspective view of a wristwatch in which a winding mechanism is integrated. 20 : Sealed enclosure 21 : Watch case #CMT#METALLURGY : #/CMT# The metal alloy is metallic hydride alloy such as alloy of lanthanum, cerium, nickel and cobalt, alloy of lanthanum, cerium, nickel and tin, neodymium and nickel alloy, neodymium and cobalt alloy, neodymium and tin alloy, praseodymium and nickel alloy, praseodymium and cobalt alloy, praseodymium and tin alloy.