US 5,339,293 AGranted

Watch with hands for multiple time displays

AssigneeCitizen Watch Co., Ltd.

InventorsYasuo Kamiyama, Takeo Mutou, Takashi Osa

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Abstract

A dual center wheel (38), provided with a plurality of dual center wheels (36) for display of times in different time zones, driven on a hands wheel for displaying the current time, and a dual adjustment member (49) adjusted by an external adjustment member (9), is formed from a gear (38a) and a pair of planetary wheels (44, 45) supported on the gear (38a). The dual center wheel (38) is also provided with a dual wheel (43), for which the rotation is regulated by means of a jumper spring, which engages one of the planetary wheels (44), and with a dual hour wheel (46) which engages the other planetary wheel (45) rotating on the same shaft as the dual wheel (43). The dual hour wheel ( 46 ), of which rotanional speed is reduced as a result of the rotation of the dual center wheel (38), makes one turn of an integer fraction of a rotation for a one pitch rotation of the dual wheel ( 43 ).

Claims5

Dependent claims

A watch with hands for multiple time displays comprising:

a first hand display section positioned at approximately a center of a display section,
a plurality of second hand display sections situated around the first hand display section and having dual center wheels (38, 39),
a drive gear train for the first hand display section and including a second minute wheel (36) engaging simultaneously the dual center wheels (38, 39) of the plurality of the second hand display sections to move together, and
an adjustment mechanism for the second hand display sections arranged independently from the drive gear train for the first hand display section, said adjustment mechanism including;
a dual wheel (43),
the dual center wheel (38),
planetary gears (44, 45) formed on the dual center wheel (38),
an external adjustment member (9), and
a dual adjustment member (49) rotationally driven by the external adjustment member (9), wherein said dual wheel (43) engages the planetary wheel (44) and is rotatably regulated by a jumper spring (42), said dual wheel (43) having a dual hour wheel (46) engaging the planetary wheel (45) and coaxially arranged therewith, said dual hour wheel (46) rotating by rotation of the dual center wheel (38) at a speed lower than that of the dual center wheel (38) and rotating at an integer fraction of one rotation relative to one pitch rotation of the dual wheel (43).

6 more elements

Dependencies are inferred from the claim text.