A timepiece mechanism for returning the seconds hand to zero, which includes a seconds arbor; a seconds hand; a cam forming a snail cam path which extends in a spiral around the seconds arbor from an inner end to an outer end connected to each other by a radial stop surface; a hammer carrying a cam follower, rotatably mounted about a hammer axis between a disengaged position wherein the cam follower is removed from the cam path and an engaged position wherein the cam follower presses on the cam path; a retaining ratchet system including a toothed wheel and a click which engages with the toothed wheel.

A timepiece mechanism for returning the seconds hand to zero, which includes a seconds arbor; a seconds hand; a cam forming a snail cam path which extends in a spiral around the seconds arbor from an inner end to an outer end connected to each other by a radial stop surface; a hammer carrying a cam follower, rotatably mounted about a hammer axis between a disengaged position wherein the cam follower is removed from the cam path and an engaged position wherein the cam follower presses on the cam path; a retaining ratchet system including a toothed wheel and a click which engages with the toothed wheel.

A method for operating a counting device (90), such as a countdown device, or a timepiece movement (100) or a timepiece (200), the method including performing a first action on a first control member (C1) causing a first timepiece function to be returned to an initial state, and then performing a second action on the first control member (C1) causing an action of adjusting or winding a second timepiece function.

A horological mechanism (1000) with a first train (100) and a first output wheel set (101), a second train (200) and a second output wheel set (102), for alternately displaying on a display (800, 8, 28) a first and a second indication respectively specific to the first train and second train, by a switching and coupling mechanism (500), including two input wheel sets (1; 2) connected to the output wheel sets, which includes a sliding wheel set (5) capable of moving under constant strain between the two input wheel sets, and cooperating alternately and exclusively with either one, selected under the action of a command from a user, to establish a driving connection between the input wheel set engaged with the sliding wheel set at the given moment in time, and a display (800, 8, 28) to produce a switchable display.

A cam-type timepiece component (1), which has at least one portion of substantially planar shape, having a material hardness greater than or equal to 600 hv, this portion having a thickness greater than or equal to 350 microns, or even greater than or equal to 400 microns, and comprising at least one functional flank (3) which is substantially perpendicular to a main surface (2) of this portion and has a roughness ra of less than or equal to 50 nm.

A movement includes a tourbillion block, a tourbillion unit, and a zero reset mechanism. The tourbillion unit includes a carriage, a balance wheel, and an escape wheel. The balance wheel and the escape wheel are rotationally arranged on the carriage. The carriage is rotationally supported on the tourbillion block. The zero reset mechanism includes a first wheel in engagement with the escape wheel. The movement is switchable between a driving mode and a reset mode. When in the driving mode, the zero reset mechanism is rotationally locked to the tourbillion block. When in the reset mode, the zero reset mechanism is rotatable relative to the tourbillion block.

The cam-type timepiece component (1) has at least one portion of substantially planar shape, having a material hardness greater than or equal to 600 HV, the portion having a thickness greater than or equal to 200 microns, or even greater than or equal to 350 microns, or even greater than or equal to 400 microns, and at least one functional flank (3) which is substantially perpendicular to a main surface (2) of the portion and has a roughness Ra of less than or equal to 50 nm.

A timepiece transmission mechanism, with a differential mechanism with inputs or outputs including a first wheel set cooperating with a first train and a second wheel set cooperating with a second train, this differential mechanism kinematically connecting the first wheel set and second wheel set in the coupling position, and separating them in the uncoupling position, the first wheel set carrying a planet wheel set which meshes with a toothing of an arbor integral in rotation with the second wheel set, and with a crown-wheel forming another input or output of the differential mechanism, which includes control means arranged to lock or release the crown-wheel to perform the coupling or the uncoupling function, depending on the position given to the control means by a selector arranged to cooperate with an actuator of a timepiece movement, or to be operated by a user.

A display mechanism a wheel carrying, constrained to rotate with it, a first wheel and a snail-shaped cam, the mechanism having an active first state in which the first wheel is driven in rotation by a driving wheel and a zero reset second state in which it is no longer driven to allow it to return to a predefined position, associated with a predefined position of the display member, the display mechanism further including a feeler-spindle adapted to cooperate with the perimeter of the cam, the feeler-spindle and the perimeter of the cam being adapted and sized so that the feeler-spindle exerts on the cam, in the second state, a return force having a non-radial component adapted to return the first wheel to its predefined position.

A clockwork column selector mechanism, including a mobile with columns protruding above a base surface separated by clearances, forming slots along a profile, arranged to, in certain positions of the mobile, enable the insertion of a feeler-spindle into a clearance in a transverse direction substantially normal to the profile and parallel to the reference surface, and to, in other positions of the mobile, stop a feeler-spindle on a transverse surface of a column, at least one column including an intermediate transverse stopping surface constituting a stop bearing surface of a feeler-spindle and enable a partial insertion of a feeler-spindle in the thickness of one the slot, and which is located, in a transverse direction, between the geometric envelopes of two end transverse surfaces transversely delimiting this column.