Wheel and pinion assembly with friction drive/slip coupling for

Details Wheel and pinion assembly with friction drive/slip coupling for Wheel and pinion assembly with friction drive/slip coupling for

1992-04-20

1992-10-13

Miska, Vit W.

Horology: time measuring systems or devices

Regulating means

For setting

368220, 368322, G04B 2702, G04B 1902

Patent

active

051557126

ABSTRACT:
An improved reduction gear assembly with friction drive/slip coupling for a timepiece movement, comprising a metal pinion member having a toothed pinion and a coaxial stem extending from an abutment surface on said pinion, including (1) a cylindrical portion, (2) a frustum portion tapering from a smaller diameter to a larger diameter (3) a terminating tapered end portion; and a plastic wheel member having a toothed wheel and first and second coaxial journals extending from opposite sides of the. A central passage in the journals has a constricted section therein with a diameter slightly less than that of said larger diameter of said frustum portion on said metal pinion member with the frustum disposed in said constricted passage with a snap fit, whereby a friction drive/slip coupling is provided between the metal frustum portion of the metal pinion member and the constricted passage of the plastic wheel member.

REFERENCES:
patent: 3290875 (1966-12-01), Egger et al.
patent: 3779002 (1973-12-01), Zaugg
patent: 3837161 (1974-09-01), Wuthrich
patent: 4209969 (1980-07-01), Kitai et al.
patent: 4233680 (1980-11-01), Sudler et al.
patent: 4259735 (1981-03-01), Vuille
patent: 4415272 (1983-11-01), Heinzelmann
patent: 4932011 (1990-06-01), Schwartz

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