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US 4,074,517 AGranted
Gear train for a wrist watch
AssigneeKabushiki Kaisha Daini Seikosha
InventorsYoshio Tatsumi, Tooru Kadowaki
Life of this patent
Estimating the term…
Abstract
In the gear train of a wrist watch a jewel mounted on the lower side of a gear wheel connected to the second hand engages the enlarged upper end of the center pipe. The friction factor between the gear wheel and the center pipe is thereby reduced and the performance of the watch is improved.
Claims5
A gear train for a wrist watch movement comprising in combination:
- a center pipe, a gear wheel rotatably mounted coaxially with and at one end of said center pipe, said gear wheel being connected to a hand of the watch, and a jewel recessed in the lower face of said gear wheel and rotatably engaging said end of said center pipe, whereby the friction factor of said gear wheel in a rotary state is reduced.
Dependencies are inferred from the claim text.