公开(公告)号：US09903049B2

公开(公告)日：2018-02-27

申请号：US15045159

申请日：2016-02-16

Applicant: Master Dynamic Limited

Inventor： Ho Ching ,  Pui Hang Ko

IPC: G04B17/22 ,  C30B29/06 ,  G04B17/06 ,  C30B33/12 ,  G04B1/14

CPC classification number: C30B29/06 ,  C30B33/12 ,  G04B1/145 ,  G04B17/066 ,  G04B17/227

Abstract: A torque-restoring element for an oscillator for a mechanical timepiece and having an oscillator frequency, said torque restoring element comprising a spiral spring body having a number N turnings with an inner terminal end for engagement with a rotational inertial element via a collet, and an outer terminal for engagement with a stationary cock element, and having a width, a height and a total arc length; wherein the spiral spring body includes a core formed from mono-crystalline silicon wafer oriented along the crystallographic axis ; and wherein the spiral spring body includes at least one peripheral coating of a material having a thermal elastic constant different from that of the core of the spiral spring body so as to maintain the oscillator frequency an oscillator including the torque-restoring element substantially insensitive to variations of ambient temperature.

公开(公告)号：US08882341B2

公开(公告)日：2014-11-11

申请号：US14154055

申请日：2014-01-13

Applicant: Master Dynamic Limited

Inventor： Siu Kay Chu ,  Ho Ching ,  Pui Hang Ko

IPC: G04B17/04 ,  G04B17/34

CPC classification number: G04B17/345

Abstract: A hairspring collet for a hairspring for interference engagement and an interference fit with the cylindrical outer surface of the staff of a balance wheel for a timepiece movement, the hairspring collet portion comprising a plurality of circumferentially extending elastically deformable interconnected arm portions, the arm portions forming an annulus having a central axis and providing an aperture therebetween, wherein each arm portion including a curved concave engagement portion for engagement with the outer surface of a staff of a balance wheel, wherein each engagement portion has substantially the same radius of curvature as each other and are equally spaced from the central axis at a first distance and wherein the first distance is less than the radius of the staff of the balance wheel; the engagement portions have a radius of curvature such that upon deformation of the arm portions and engagement with the outer surface of the staff the engagement portions substantially conform with the outer surface of the staff and an interference fit is formed therebetween, wherein stress induced from said interference fit is transferred and distributed from along the engagement portions to the arm portions adjacent the engagement portions and distributed therein; and wherein the interference fit of the engagement portions with the staff substantially prevents relative movement between the hairspring collet and the staff of the balance wheel upon application of load from a hairspring in use in a timepiece movement.

Abstract translation: 用于干涉接合的游丝的游丝夹头和与用于钟表运动的摆轮的工作人员的圆柱形外表面的过盈配合，游丝夹头部分包括多个周向延伸的可弹性变形的互连臂部分，臂部形成 具有中心轴线并在其间提供孔的环形空间，其中每个臂部分包括用于与摆轮的工作人员的外表面接合的弯曲凹形接合部分，其中每个接合部分具有彼此基本相同的曲率半径 并且在第一距离处与中心轴线等距地间隔开，并且其中第一距离小于摆轮的工作人员的半径; 接合部分具有曲率半径，使得当臂部分变形并且与工作人员的外表面接合时，接合部分基本上与工作人员的外表面一致，并且在它们之间形成过盈配合，其中由所述 过盈配合从接合部分转移并分配到邻近接合部分的臂部分并分布在其中; 并且其中，当在手表运动中施加来自使用中的游丝的负载时，接合部分与工作人员的过盈配合基本上防止了游丝夹头和摆轮的工作人员之间的相对运动。