Watch cannon-pinion

摘要

Watch cannon-pinion including a first bore for receiving a pivot-shank including, on either side of a recess, a first shoulder and a second shoulder.;This cannon-pinion is made in two parts and includes, on the one hand, a body comprising internally the first bore and externally a support shoulder, and on the other hand, a shape memory alloy ring including a second bore, and, in the free state, the second bore has a larger diameter than that of the support shoulder when the ring is in a martensitic structure, and a smaller diameter than that of the support shoulder when the ring is in an austenitic structure.

主权项

1. A watch cannon-pinion including a first bore for receiving a pivot-shank that includes, on either side of a recess of a given width, a first shoulder of a first length and a second shoulder of a second length, wherein said cannon-pinion is made in at least two parts and includes a body comprising internally said first bore and externally a support shoulder at least one deformable shape memory alloy ring which is arranged to take a first geometry in a first martensitic state, or a second geometry in a second austenitic state, said ring including a second bore, wherein said second bore, in a free state, has a larger diameter than the diameter of said support shoulder when said ring is in said first geometry with a structure corresponding to said first martensitic state, and a smaller diameter than the free diameter of said first support shoulder when said ring is in said second geometry with a structure corresponding to said second austenitic state.