Device for securing and adjusting a bearing, especially for timepieces

Device (1) for securing and adjusting a bearing (P) in an orifice provided for that purpose in a bridge or a plate of a timepiece, comprising:

• a. A first screw (2), so-called bearing screw, defining an support opening (24) of such a bearing (P) having a diameter d1, said first screw (2) comprising an external thread (F1) having an external diameter df1 larger than d1 and a length L1, measured perpendicularly to said diameters d1, df1;
• b. A second screw (3), so-called locking screw, defining an internal bore (33) of diameter d2 smaller or equal to d1, said second screw (3) comprising an external thread F2 having an external diameter df2 larger than diameters d2, d1, df1 and a length L2, measured perpendicularly to said diameters d2, df2;
• and
• c. A socket (4) defining a tubular housing (41) extending following a longitudinal axis (A-A′), said tubular housing (41) comprising a first tapped section (S1), adapted to screw the first screw (2), and a second tapped section (S2), adapted to screw the second screw (3), said tapped sections being joined by a medium section (S3) of linear guiding of said screws (2, 3);
• d. The external threads (F1, F2) of the first and second screws (2, 3) and the corresponding sections (S1, S2) of the socket (4) have respective screwing pitches in opposite directions.