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Actuating mechanisms for wrist instruments

  • US 3,911,666 A
  • Filed: 10/21/1974
  • Issued: 10/14/1975
  • Est. Priority Date: 10/21/1974
  • Status: Expired due to Term
First Claim
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1. In a timepiece adapted to be worn on the wrist and including a power source having first and second electrical terminals, a display, means for illuminating said display, and actuating means for connecting said power source to the illuminating means to energize same, the improVement wherein said actuating means comprises:

  • inertia actuated switch means including a movable contact;

    spring said movable contact being designed and mounted to be biased out of contact with said first terminal, said illuminating means being connected between said movable contact and said second terminal so that engagement of said first terminal by said movable contact completes a circuit from said power source through said illuminating means; and

    movable hammer means, said movable contact being positioned between said movable hammer means and said first terminal, said hammer means being adapted to move said movable contact into engagement with said first terminal in the presence of a deliberate rapid acceleration and/or deceleration of said wrist having a predetermined minimum magnitude.

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