Timepiece movement
AssigneeETA SA Fabriques d'Ebauches
InventorsMarco Bettelini, Theodor Schoenenberger
Life of this patent
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Abstract
The invention concerns the structure of a timepiece movement, more particularly the structure of the hour wheel (1), the inside of whose pipe (4) includes an annular bulge (6) co-operating with an annular groove (22) arranged on the outer wall of the pipe (21) of the cannon-pinion (7). Thus, the hour wheel is snap-fitted onto the movement, without it being necessary to provide an additional part for this purpose, and its toothed wheel (3) cannot therefore be released from the motion-work pinion (19) during transport of the movement.
Claims17
A timepiece movement including a plate, a display device with hands, a gear train connecting drive means to said hands, said train including a drive wheel meshed at least indirectly with said drive means and secured to a cannon-pinion pivoting on a post mounted in a gear train bar, an hour wheel arranged around the cannon-pinion and resting on the plate, the drive wheel and the hour wheel extending respectively on either side of said plate, wherein the hour wheel and the cannon-pinion respectively include complementary means for holding the hour wheel axially on the cannon-pinion.
Dependencies are inferred from the claim text.