Timepiece with a chronograph mechanism

Details Timepiece with a chronograph mechanism Timepiece with a chronograph mechanism

1996-10-29

1998-08-11

Roskoski, Bernard

Horology: time measuring systems or devices

Time interval

Mechanical stop time type

368110, 368220, G04F 800

Patent

active

057937087

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.

REFERENCES:
patent: 3903686 (1975-09-01), Burki
patent: 4351040 (1982-09-01), Aoki
patent: 4389122 (1983-06-01), Dubois et al.
patent: 4588305 (1986-05-01), Piguet et al.
patent: 5113382 (1992-05-01), Bron
patent: 5339293 (1994-08-01), Kamiyama et al.

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