| 摘要 |
The collet is formed by a metal band ( 10 ) whose inner contour ( 11 ) delimits the recesses ( 11 a, 11 b, 11 c) for driving the collet onto a balance staff ( 2 ) and whose outer contour ( 12 ) includes a function point ( 4 ) between the collet and the balance spring ( 9 ) located at the end of an arm ( 14 ) at a distance R from the centre 0 of the staff ( 2 ) greater than that of any other point ( 6, 8, 13, 15, 17 ) of the outer contour ( 12 ). It is characterised in that the inner contour ( 11 ) includes a discrete number of points of contact ( 1, 3, 5, 7 ) with the staff ( 2 ) distributed along identical or different angular apertures alpha and in that width "I" of the band ( 10 ) varies such that the compression forces of the contact points ( 1, 3, 5, 7 ) on the staff ( 2 ) do not substantially alter the distance R after driving in, leading to a friction torque allowing angular orientation of the collet on the staff ( 2 ) and not introducing any unbalance.
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