Timepiece mechanism for returning the seconds hand to zero with a snail cam
AssigneeMontres Breguet S.A.
InventorsJerome Mace, Sebastian Alagon Carrillo, Alain Zaugg
Life of this patent
Estimating the term…
Abstract
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.
Claims11
1-10 (canceled)
A timepiece mechanism for returning the seconds hand to zero, comprising:
- a seconds arbor;
- a seconds hand integral in rotation with the seconds arbor;
- a cam integral in rotation with the seconds arbor and a peripheral edge of which forms a cam path;
- a hammer provided with a cam follower, said hammer being rotatably mounted about a hammer axis between a disengaged position in which the cam follower is removed from the cam path, and an engaged position wherein the cam follower presses on the cam path to produce a drive torque on the seconds arbor;
- said mechanism comprising:
- wherein the cam takes the form of a snail, the cam path extending in a spiral around the seconds arbor from an inner end to an outer end which are connected to each other by a stop surface which extends substantially radially relative to the seconds arbor and against which the cam follower comes into abutment in an angular end-of-travel position of the seconds hand;
- wherein it comprises a retaining ratchet system including a toothed wheel mounted on the seconds arbor, and a click carried by the cam and which engages with the toothed wheel.
Dependencies are inferred from the claim text.