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

• Current Assignee: Pacific Transducer Corp.
• Original Assignee: Pacific Transducer Corp.
• Inventors: Argabrite, George A.
• Primary Examiner(s): Queisser, Richard C.
• Assistant Examiner(s): Roskos, Joseph W.
• Application Number:
  US05/771,611
• Time in Patent Office: 609 Days
• Field of Search: 73/362.8, 73/363.5, 73/363.7, 73/363.9
• US Class Current: 374/206
• CPC Class Codes: G01K 1/143 for measuring surface temperatures
• CPC Class Codes: G01K 5/70 specially adapted for indicating or recording

Abstract

A thermometer for measuring a surface temperature having in its lower portion a spiral bimetallic strip mounted centrally on the lower end of a spindle whose upper end carries an indicating pointer. The spindle is journaled in an elongated tubular stem carrying at its upper end a dial face bearing angularly spaced indicia with which the pointer cooperates for indicating temperature. The lower end of the stem has fixed thereto a cup-shaped shield, downwardly open, surrounding the bimetallic strip, and including means restraining angular movement of the outer end of the bimetallic strip, but permitting limited axial movement of the strip and spindle relative to the stem and shield.

Claims

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.