Exhaust tooth, escape wheel comprising this exhaust tooth, anchor escapement, movement, mechanical timepiece, and method of transmitting torque

摘要

An exhaust tooth capable of effectively transmitting torque upon the change of a pulse surface, an escape wheel including the exhaust tooth, an anchor escapement including the escape wheel, a movement including the escape wheel and a mechanical timepiece and a torque transmission method are provided. In an exhaust tooth (1) of an escape wheel (2) of an anchor escapement of a mechanical timepiece, a rest nozzle (30) which connects a resting surface (10) and a pulse surface (20) has the curved shape of a convex curved surface portion (31). This convex curved surface portion (31) may be a first convex curved surface portion (31) and, in the impulse surface (20), there may be a second convex curved surface portion (21), which is curve and which is continuous with the first convex curved surface portion (31) of the quill (30). The second convex curved surface portion (21) may extend over the entire impulse surface (20). In the impulse surface (20), the portion which is continuous with the portion of the second convex curved surface portion (21) may be flat.