Clock movement comprising a barrel having a small core diameter

摘要

The invention relates to a clock movement (100) comprising a plate (10) and a bridge (11) supporting a barrel (1) that comprises a barrel spring (2) between a drum (3) and a surface (5) for receiving a core (4) and a cover (7) attached to said drum (3). Said spring (2) is made from a multiphase cobalt/nickel/chrome alloy the Young s modulus of which is between 200 and 240 GPa and the shear modulus of which is between 80 and 100 GPa and the ratio of the width/thickness thereof is between 3 and 23 wherein the maximum radius of said steel or stainless steel core (4) relative to the pivot axis thereof (D) is less than nine times the maximum thickness of said spring (2) and said movement (100) comprises a means for limiting play which comprises a chock ring (70) which is separate from said core (4) and which is guided by a bearing (44) of the latter.