Thermostatic elements

Abstract

Abstract A THERMALLY SENSITIVE ELEMENT COMPRISING A SEALED, SPIRAL, METAL TUBE WHICH IS FILLED WITH A NON-TOXIC LIQUID UNDER PRESSURE AND WHICH, IN CROSS SECTION, IS FORMED WITH AN OPPOSED PAIR OF NARROWER, CURVED WALLS HAVING CONCAVE INTERNAL SURFACES, AND WITH AN OPPOSED PAIR OF WIDER WALLS HAVING FLAT AND PARALLEL PORTIONS, THE SAID WALLS ARE OF THE SAME UNIFORM THICKNESS, THE INTERNAL RADIUS OF THE NARROWER WALLS IS NOT LESS THAN TWICE AND NOT MORE THAN FIVE TIMES THE WALL THICKNESS, THE WIDTH OF THE PARALLEL PORTIONS OF THE WIDER WALLS IS NOT LESS THAN THE MEAN THICKNESS OF THE TUBE, AND THE MEAN WIDTH OF THE TUBE IS NOT LESS THAN TWICE THE SAID MEAN THICKNESS. THE ELEMENT IS PRODUCED BY A METHOD WHICH COMPRISES FABRICATING THE TUBE IN A STRAIGHT, OPEN-ENDED FORM, FILLING THE TUBE WITH A SOLID SUPPORTING MEDIUM HAVING A LOW MELTING POINT, SHAPING THE STRAIGHT TUBE TO THE SPIRAL FORM, MELTING AND EXPELLING THE SUPPORTING MEDIUM, SEALING ONE END OF AND EVACUATING THE TUBE, FORCING THE NON-TOXIC LIQUID UNDER PRESSURE INTO THE TUBE THROUGH THE OPPOSITE END, AND SEALING THE SAID OPPOSITE END.

Inventors

• 👤 Dennis C Arbon

Bibliographic Details