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Monitoring devices

  • US 4,246,456 A
  • Filed: 05/07/1979
  • Issued: 01/20/1981
  • Est. Priority Date: 08/01/1975
  • Status: Expired due to Term
First Claim
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1. A safety device for providing electrical indication of machine malfunction, which comprises an elongate bar of fracturable material, means for anchoring one end of said bar upon a first machine portion to project said bar in cantilever fashion therefrom and position the free end of said bar to be struck with fracturing force by a second machine portion in response to machine malfunction, said first and second machine portions being relatively movable along a path generally normal to the longitudinal axis of said elongated bar, said bar presenting an outer surface between the ends thereof, electrical path means on said surface for providing electrical indication when said bar is fractured, said path means comprising a loop of electrically conductive material presenting spaced leg portions extending lengthwise of said bar and a bight portion joining said leg portions adjacent said free end of the bar and remote from terminal ends of said leg portions, said loop of conductive material being in the form of a thin film layer formed on and joined to said surface so as to be exposed for visual inspection while assuring rupture thereof in response to fracture of said bar, means transversely spanning said bar for weakening the same such that fracture of said bar will occur at and transversely across said weakening means, and said weakening means being further located between said bight portion and said terminal ends thereby assuring that fracture of said bar results in the rupture of said conductive material.

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