A vertical clutch device for a timepiece includes along a vertical axis a first wheel rotatably mounted about the vertical axis, a clutch disc, a spring, and a second wheel rotatably mounted about the vertical axis. The vertical clutch device is able to assume a clutched position where the second wheel is rotated by the first wheel under the action of the spring exerting a vertical force Fe to press the clutch disc against the first wheel and a disengaged position where the clutch disc is subjected against the action of the spring to a vertical force Fd separating it from the first wheel so that the second wheel is not rotated by the first wheel. The spring of the vertical clutch device is made of a shape memory alloy.

A horological mechanism (110), notably a horological movement or chronograph module, including a couching chain (100) having an epicycloidal train (31, 32, 33, 34) including a first sun wheel (33) fixed to the frame.

A vertical clutch device for a timepiece includes along a vertical axis a first wheel rotatably mounted about the vertical axis, a clutch disc, a spring, and a second wheel rotatably mounted about the vertical axis. The vertical clutch device is able to assume a clutched position where the second wheel is rotated by the first wheel under the action of the spring exerting a vertical force Fe to press the clutch disc against the first wheel and a disengaged position where the clutch disc is subjected against the action of the spring to a vertical force Fd separating it from the first wheel so that the second wheel is not rotated by the first wheel. The spring of the vertical clutch device is made of a shape memory alloy.

A horological mechanism (110), notably a horological movement or chronograph module, including a counting chain (100) having an epicycloidal train (31, 32, 33, 34) including a first sun wheel (33) fixed to the frame.

The present invention relates to a lever device (10) of a watch mechanism, comprising a column wheel (16) and a main lever (20) mounted so as to pivot, about a first pivot axis (24), alternately between two stable positions. The main lever (20) comprises an anchor provided with two beaks (21a, 21b) which, in each of the two stable positions, are alternately located, one of them between two columns (17) and the other in contact with a peripheral flank of another column (17). The main lever (20) further comprises a distal part (26, 29) for controlling the watch mechanism. The anchor and the distal part (26, 29) of the lever are arranged to pivot about the first pivot axis (24). The invention also relates to a watch movement comprising a chronograph and the lever device arranged to bring the chronograph from a disengaged configuration to an engaged configuration and vice versa.