×

Probe surface thermometer

  • US 4,121,463 A
  • Filed: 02/22/1977
  • Issued: 10/24/1978
  • Est. Priority Date: 02/22/1977
  • Status: Expired due to Term
First Claim
Patent Images

1. In a surface thermometer, in combination:

  • a body comprising an elongated tubular stem;

    a dial plate fixed concentrically to the upper end of the stem and bearing thereon temperature indicia;

    a spindle rotatably and axially movably mounted in the stem having fixed to its upper end a pointer spaced above the dial plate and provided with a smooth lower tip for contacting the surface of a sample;

    resilient means urging the spindle downwardly relative to the stem;

    means for limiting downward axial movement of the spindle relative to the stem;

    a downwardly open rigid cup-shaped shield fixed to the lower end of the stem and having a lower annular edge lying in a plane normal to the spindle axis; and

    a temperature sensitive bimetallic spiral strip having its inner end fixed to the lower end of the spindle and its outer end contacting the shield for movement relative thereto only axially of the spindle, the strip having a lower edge lying in a plane perpendicular to said axis and slightly above the tip and normally below the plane of the annular edge, the strip being retracted into the shield against the force of the resilient means when the tip and the annular edge are pressed into contact with a sample.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×