1976-06-01
1978-11-07
Witkowski, Stanley J.
G04B 1732
Patent
active
041238974
ABSTRACT:
A jumper spring for use in a timepiece to releasably hold a toothed wheel comprises a spring member having a generally V-shaped portion engageable with the toothed wheel for releasably holding the wheel during use of the jumper spring, and an elongated arm portion connected to the V-shaped portion. A sputtered layer of chromium covers a part of the V-shaped portion and a sputtered layer of another material overlies the chromium layer. The other material is selected from the group consisting of either a hard material, such as Al.sub.2 O.sub.3, TiC and SiC or a material having a low coefficient of friction, such as MoS.sub.2 so as to provide the necessary hardness or low coefficient of friction needed to enable the jumper spring to withstand repeated engagement with the toothed wheel.
REFERENCES:
patent: 3511340 (1970-05-01), Simon-Vermot
patent: 3738101 (1973-06-01), Simon-Vermot
patent: 3789604 (1974-02-01), Hurt
patent: 3991556 (1976-11-01), Renaud
Ohki Ryoichi
Sano Motohiro
Adams Bruce L.
Burns Robert E.
Kabushiki Kaisha Daini Seikosha
Lobato Emmanuel J.
Witkowski Stanley J.
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