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    • 45. 发明授权
    • Balance spring with two hairsprings and improved isochronism
    • 平衡春天有两个游丝和改善的等时性
    • US09004748B2
    • 2015-04-14
    • US13731486
    • 2012-12-31
    • Montres Breguet S.A.
    • Jean-Luc HelferKaspar Trumpy
    • G04B17/06
    • G04B17/063G04B17/066
    • A balance spring includes a first hairspring, a second hairspring, and an attachment member securing an outer coil of the first hairspring to one end of the second hairspring so as to form a dual balance spring in series. A curve of the first hairspring and a curve of the second hairspring each have a continuously variable pitch and are symmetrical relative to a straight line parallel to first and second planes and pass through a median plane of projection of the attachment member. Each hairspring further includes at least two counterweights so as to compensate for an unbalance formed by a mass of the attachment member and personalize an anisochronism slope of the balance spring.
    • 平衡弹簧包括第一游丝,第二游丝和将第一游丝的外线圈固定到第二游丝的一端的附接构件,以便形成串联的双重平衡弹簧。 第一游丝的曲线和第二游丝的曲线各自具有连续可变的间距,并且相对于平行于第一和第二平面的直线对称,并且穿过附接构件的中心平面。 每个游丝还包括至少两个配重,以便补偿由附接构件的质量形成的不平衡并且个性化平衡弹簧的不同时期斜率。