Bistable hammer for a chronograph mechanism

Horology: time measuring systems or devices – Time interval – Mechanical stop time type

Reexamination Certificate

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Details

C368S101000

Reexamination Certificate

active

07918602

ABSTRACT:
The invention relates to a chronographic timepiece and a chronograph mechanism (7) thereof including an elapsed time indicator member (17), a reset control member (21), and a reset device (25) for the indicator member, which includes a hammer (61), mounted in translation between an inactive position, where the hammer (61) is moved away from heart-pieces (55, 57, 59) that are connected to the indicator member (17), and an active position where stop members (54, 56, 58) of the hammer exert a reset force against the heart-pieces. The hammer (61) includes two studs (64, 66) mounted so as to slide in holes (100, 102) such that the movement vectors (L, K) of the studs (64, 66) between the positions are collinear and not aligned.

REFERENCES:
patent: 3457720 (1969-07-01), Bachmann
patent: 5793708 (1998-08-01), Schmidt et al.
patent: 7029169 (2006-04-01), Takahashi et al.
patent: 2004/0218473 (2004-11-01), Takahashi et al.
patent: 2006/0207198 (2006-09-01), Sondermann
patent: 2007/0206447 (2007-09-01), Hiraya et al.
patent: 0 772 104 (1997-05-01), None
patent: 1 462 884 (2008-05-01), None
European Search Report issued in corresponding application No. EP 07 15 0324, completed Aug. 29, 2008.

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