Strain gauge for large extensions

• US 3,332,280 A
• Filed: 03/26/1965
• Issued: 07/25/1967
• Est. Priority Date: 04/10/1964
• Status: Expired due to Term

• Current Assignee: Brien Campbell Robert, Edward Fish Daniel Cccil
• Original Assignee: Brien Campbell Robert, Edward Fish Daniel Cccil
• Inventors: EDWARD FISH DANIEL CCCIL, BRIEN CAMPBELL ROBERT
• Application Number:
  US04/443,130
• Time in Patent Office: 851 Days
• US Class Current: 73/774
• CPC Class Codes: G01B 7/16 for measuring the deformation in a solid, e.g. by resistance strain gauge
• CPC Class Codes: G01L 1/20 by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids of piezo-resistive materials G01L1/18; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
• CPC Class Codes: H01C 10/10 adjustable by mechanical pressure or force
• CPC Class Codes: H01G 9/0029 Processes of manufacture

Claims

1. A STRAIN GAUGE COMPRISING A TUBE OF AN ELASTOMER MATERIAL, A CONDUCTIVE ELECTRODE SEALED INTO EACH END OF THE TUBE, A FILLING FOR THE TUBE CONSISTING OF AN ELECTROLYTE INCLUDING A SOLVENT LIQUID, SAID TUBE COMPRISING AN INNER TUBULAR LAYER OF AN ELASTOMER MATERIAL WHICH IS RESISTANT TO ATTACK BY AND IS SUBSTANTIALLY IMPERVIOUS TO THE ELECTROLYTE, AND AN OUTER TUBULAR LAYER OF AN ELASTOMER MATERIAL WHICH IS HIGHLY IMPERVIOUS TO LIQUIDS AND MAY BE RESISTANT TO ATTACK BY THE ELECTROLYTE, THE INNER TUBULAR LAYER BEING SATURATED WITH THE SOLVENT LIQUID OF THE ELECTROLYTE, THE TWO TUBULAR LAYERS BEING SEALED TO ONE ANOTHER AT THEIR ENDS WHEREBY THE ESCAPE OF ELECTROLYTE IS HINDERED AND WHEREBY THE OUTER TUBULAR LAYER IS PROTECTED FROM ATTACK BY THE ELECTROLYTE.