Two conductor hairspring-hub arrangement for electric watches

Details Two conductor hairspring-hub arrangement for electric watches Two conductor hairspring-hub arrangement for electric watches

1975-02-24

1976-04-20

Jackmon, Edith Simmons

29177, 58 28B, G04C 304, G04B 1706

Patent

active

039509389

ABSTRACT:
The two conductor hairspring-hub arrangement comprises a metallic and substantially conventional hairspring which is fastened to a unitary hub, i.e. a metallic washer-like hub, to form a core or inner conductor. This inner conductor is sheathed with an insulating mantle or layer which is, in turn, coated with an electrical conductive mantle, i.e. an outer conductor insulated from the inner conductor.
The insulating and conductive mantles have openings so that separate electrical connection can be made to the inner and outer conductors at each end of the hairspring-hub arrangement.
In this manner, a two conductor hairspring-hub arrangement is provided which in an electric watch is capable of coupling drive pulses to a balance wheel drive coil.

REFERENCES:
patent: 3528237 (1970-09-01), Suard
patent: 3553956 (1971-01-01), Schwartz et al.

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