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Balance of watches and method of its manufacture

  • US 3,893,288 A
  • Filed: 01/02/1974
  • Issued: 07/08/1975
  • Est. Priority Date: 01/20/1973
  • Status: Expired due to Term
First Claim
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1. A balance assembly for an electric watch comprising a shaft oscillatory about its axis, a hub member formed of an electrically insulating material rigidly connected to and symmetrical with said shaft, electromagnetic means mounted to said hub member and a metallic, electrically conducting ring member coaxial with said shaft and peripherally disposed about said hub member and in engaging retentive relationship therewith.

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