G - Physics – 04 – B
Patent
G - Physics
04
B
G04B 13/02 (2006.01) G04B 11/00 (2006.01)
Patent
CA 2091657
PI-1323 - Mose, et al ABSTRACT OF THE DISCLOSURE 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.
Mose Friedrich
Plancon Michel
Schwartz Herbert
Gowling Lafleur Henderson Llp
Timex Corporation
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