Shockproof bearing for balance spring of mechanical horological movement of wrist watch, has element with hole including olive cut such that shape of hole provides contact point between bearing and cylindrical part at minimum distance

摘要

#CMT# #/CMT# The bearing (8) has an element with a hole (t) including an offset olive cut (o) such that the shape of the hole provides a contact point between the bearing and a cylindrical part of a pivot (p) of a staff balance (5) at a minimum distance (n) from a flat and perpendicular port (k) of the staff balance, where value of the minimum distance is 40 micrometers. The pivot is extended such that another element e.g. decorative element, is fixed at an end of the staff balance. #CMT#USE : #/CMT# Shockproof bearing for a balance spring of mechanical horological movement of a wrist watch. #CMT#ADVANTAGE : #/CMT# The configuration of the element having the hole avoids breakage of the pivot when the watch is subjected to impact described in ISO 1413standard. The configuration of the bearing is such that it has improved efficiency. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows an enlarged sectional view of a shockproof bearing for a balance spring. k : Flat and perpendicular port n : Minimum distance o : Offset olive cut p : Pivots t : Hole 5 : Staff balance 8 : Bearing.