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US 6,685,352 B1Granted
Timepiece power reserve indicator device
AssigneeFrederic Piguet S.A.
InventorsEdmond Capt, Alain Zaugg
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AssigneeFrederic Piguet S.A.
InventorsEdmond Capt, Alain Zaugg
Estimating the term…
The present invention concerns a power reserve indicator device (1) for a manually or automatically wound timepiece, said timepiece including a barrel, a mainspring housed in the barrel and time display elements mechanically coupled to said barrel, said indictor device (1) including a differential gear (10) a first input (8) of which is driven by a winding gear train (6) which meshes with a first driving gear formed by the barrel core, the output (16) of said differential gear (10) driving a display gear train (18) for indicating the reserve of power assured by the number of winding turns of the mainspring, characterised in that the second input (14) of the differential gear (10) is driven by a letting down gear train (12) which meshes with a second driving gear formed by the outer toothing of said barrel or by a wheel and pinion driven by said barrel.
A power reserve indicator device for a wound timepiece, said timepiece including a barrel, a mainspring housed in the barrel and time display elements mechanically coupled to said barrel, said indicator device including a differential gear a first input of which is driven by a winding gear train which meshes with a first driving gear formed by the barrel core, the output of said differential gear driving a display gear train for indicating the reserve of power assured by the number of winding turns of the mainspring, wherein the second input of the differential gear is driven by a letting down gear train which meshes with a second driving gear formed by outer toothing of said barrel, wherein said differential gear includes a differential crown having an inner toothing and an outer toothing.
A power reserve indicator device for a wound timepiece, said timepiece including a barrel, a mainspring housed in the barrel and time display elements mechanically coupled to said barrel, said indicator device including a differential gear a first input of which is driven by a winding gear train which meshes with a first driving gear formed by the barrel core, the output of said differential gear driving a display gear train for indicating the reserve of power assured by the number of winding turns of the mainspring, wherein the second input of the differential gear is driven by a letting down gear train which meshes with a second driving gear formed by a wheel and pinion driven by said barrel, wherein said differential gear includes a differential crown having an inner toothing and an outer toothing.
Dependencies are inferred from the claim text.