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US 3,982,388 AGranted
Digital display mechanism for a time-keeper
AssigneeEbauches Tavannes SA
InventorsCharles Guyot, Jacques Muller
Life of this patent
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AssigneeEbauches Tavannes SA
InventorsCharles Guyot, Jacques Muller
Estimating the term…
An instantaneous or step by step display mechanism for a time-keeper, including a constantly rotating driving wheel, a toothed wheel fixed to a first indication disc, a ratchet wheel also fixed to the indication disc, and a lever pivoted at one end, and carrying a dog engaging with the ratchet wheel, and an intermediate toothed wheel, at the other end. The intermediate wheel meshes with both the driving and indication disc wheels and when in use constantly runs up the indication disc wheel, carrying its end of the lever with it until the dog frees one tooth of the ratchet wheel, whereupon the lever falls back, advancing the display by one figure. The stem of the watch, when pulled, disengages the dog from the ratchet wheel and allows correction of the display, forwards or backwards. Minute, hour or date wheels may be provided.
An instantaneous digital display mechanism for a time-keeper comprising a first indication disc, a second indication disc adjacent thereto, drive mechanism including a first toothed wheel connected to said first indication disc, a driving wheel, an intermediate wheel in engagement with said first toothed wheel and said driving wheel, a main lever on which said intermediate wheel is pivoted, a ratchet wheel connected to said first indication disc, a dog on said main lever engageable with the teeth of said ratchet wheel, and means to correct said display mechanism, said dog being disengageable from said ratchet wheel by the automatic displacement of the said main lever by cooperation of said driving wheel, said intermediate wheel and said first toothed wheel during normal working and also by the manual displacement of the said main lever by the said means to correct said display mechanism.
Dependencies are inferred from the claim text.