Patent ID: 9367038
Filing Date: 2016-06-14
CPC Classification: G04B,Y10T

Claim Text:
1. An assembly, comprising: a balance spring which comprises two opposite lateral surfaces separated by a reference thickness, and a balance spring stud including a housing dimensioned to receive said balance spring, said stud including, around said housing, at least one one-piece component made of a shape memory alloy and including at least two lugs defining together an air gap and each arranged to rest on one of said opposite lateral surfaces of said balance spring, and wherein, in the free state, the minimum width of said air-gap is greater than the maximum value of said reference thickness when said component is in an open position corresponding to a martensitic structure, and wherein the maximum width of said air-gap is less than the minimum value of said reference thickness when said component is in a closed position corresponding to an austenitic structure, wherein said balance spring locally includes at least one area of lesser thickness whose minimum thickness is said reference thickness for which said stud is devised, and which is surrounded by areas of large thickness whose minimum thickness is greater than said reference thickness.