US 5,793,708 AGranted

Timepiece with a chronograph mechanism

AssigneeMontres Rolex S.A.

InventorsMarc Schmidt, Michel Sintes

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Abstract

A chronograph mechanism comprises a coupling member (17) engaging, on the one hand, with a pinion (15") solid with the seconds wheel and, on the other hand, with the chronograph's seconds wheel (18). This coupling member (17) also carries a retractable finger (27) adapted to drive, each turn, the first rotatable member (35) of a cinematic transmission connecting together a rotatable member (38) of the minutes wheel to that of the hours counter (41). This transmission is indexed, between two drives by the retractable finger (27), by a jumper (51) engaged in an intermediate wheel (37) of this transmission. The coupling member (17) is controlled by two levers (44, 45), one lever (44) carrying a pin (44c) which, in the uncoupled position, locks the jumper (51) in the intermediate wheel (37)'s toothing. The minutes and hours counter rotatable members (38, 41), solid with zero setting cams (42, 43), are friction fitted on their respective axles.

Claims6

Dependent claims

A timepiece comprising a chronograph mechanism, said timepiece comprising:

counters comprising a seconds counter, a minutes counter and an hours counter, each of said counters comprising an indicating member fixed for rotation with a respective rotatable member,
coupling means for selectively placing each said rotatable member in engagement with a gear train of the timepiece,
a device for controlling said coupling means,
a zero-setting mechanism for each said indicating member:
a cinematic transmission for connecting a first rotatable member fixed for rotation with a first indicator member of the minutes counter to a second rotatable member fixed for rotation with a second indicator member of the hours counter,
an indexing member in engagement with said cinematic transmission,
wherein said coupling means comprises other further rotatable members connected, on one hand, cinematically to a third rotatable member fixed for rotation with a third indicator member of the seconds counter and, on another hand, periodically to said cinematic transmission.

4 more elements

Dependencies are inferred from the claim text.