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Temperature monitoring device containing at least one element of an alloy which memorizes its shape

  • US 5,143,453 A
  • Filed: 11/27/1990
  • Issued: 09/01/1992
  • Est. Priority Date: 10/04/1988
  • Status: Expired due to Fees
First Claim
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1. A temperature monitoring device which comprises a casing of synthetic material containing a motor element made of at least one alloy which memorizes its shape and associated with a movement transmission element consisting of a piston and a rod, and acting on at least one indicator element irreversibly recording each overstepping of a predetermined temperature, said casing being provided with a transparent window enabling the state of the indicator element to be viewed, said indicator element including a wheel mounted for pivoting in the casing, rotatable in one direction only, and equipped on its periphery with teeth directed towards the rear with reference to the direction of rotation, said motor element including a spring of said alloy which memorizes its shape mounted in a cylinder whose axis is substantially tangential to the circumference of the wheel, one end of said spring being braced on the bottom of the casing while its other end bears on said piston which is mounted for sliding in the cylinder, the free end of said rod being equipped with a resiliently deformable member bearing against a tooth on the wheel, the stroke of the spring being such that a cycle of deformation brings about the rotation of the wheel by an angle equal to the angle between two successive teeth on the wheel, the casing being equipped with a stop against which a finger fastened to wheel is intended to come to bear before the wheel has pivoted 360°

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