US 7,575,369 B2
	Assembly element including two series of elastic structures and timepiece fitted with the same
Roland Bitterli, Neuchâtel (Switzerland); Wilfried Noell, Neuchâtel (Switzerland); Fabien Blondeau, Le Landeron (Switzerland); Lionel Paratte, Neuchâtel (Switzerland); Toralf Scharf, Neuchâtel (Switzerland); Pierre-André Meister, Bienne (Switzerland); and André Zanetta, Neuchâtel (Switzerland)
Assigned to ETA SA Manufacture Horlogère Suisse, Grenchen (Switzerland)
Filed on Nov. 09, 2007, as Appl. No. 11/937,789.
Claims priority of application No. 06123781 (EP), filed on Nov. 09, 2006.
Prior Publication US 2008/0112276 A1, May 15, 2008
Int. Cl. G04B 29/00 (2006.01); G04B 31/00 (2006.01)

U.S. Cl. 368—324  [368/322; 368/238; 116/328]

14 Claims

1. An assembly element made in a plate of brittle material such as a silicon, particularly for a timepiece, including an aperture provided for the axial insertion of an arbour, the inner wall of the aperture including elastic structures which are etched into the plate and which each include at least one support surface that grips the arbour radially and fixedly secures the assembly element in rotation relative to the arbour, wherein the assembly element includes a first series of elastic structures etched in a top layer of the plate and a second series etched in the bottom layer of the plate.