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Visual indicator

  • US 4,829,820 A
  • Filed: 10/15/1987
  • Issued: 05/16/1989
  • Est. Priority Date: 03/31/1987
  • Status: Expired due to Term
First Claim
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1. A visual indicator, comprising:

  • a transition mount having opposite ends;

    a conical lens secured to the one end of said transition mount, said lens having inside and outside surfaces;

    a resilient diaphragm secured between said lens and said transition mount to define a sealed chamber with said lens;

    a filler plug disposed within the sealed chamber, said plug being movable toward and away from said lens;

    said plug having a conical front side facing the opposite complementary inside surface of said lens, and a back side;

    means for normally biasing said plug away from said lens;

    means defining at least one passage for fluid communication across said plug;

    a substantially opaque liquid normally disposed within the sealed chamber between said lens and said plug in order to block visibility of said plug through said lens; and

    actuator means including a stem operatively associated with said diaphragm and extending out the other end of transition mount for actuating said plug toward said lens in order to displace said liquid and thereby visually expose said plug through said lens.

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