Transducer device for measuring mechanical values on hollow bodies

• US 4,404,854 A
• Filed: 06/15/1981
• Issued: 09/20/1983
• Est. Priority Date: 06/16/1980
• Status: Expired due to Term

• Current Assignee: Hans List
• Original Assignee: Hans List
• Inventors: Claassen, Peter, Zeiringer, Rudolf, Krempl, Peter
• Primary Examiner(s): Woodiel, Donald O.
• Application Number:
  US06/273,685
• Time in Patent Office: 827 Days
• Field of Search: 73/730, 73/119 A, 73/DIG. 4, 338/4
• US Class Current: 73/730
• CPC Class Codes: G01L 9/0001 Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means G01L9/0026, G01L9/0033, G01L9/0082, G01L9/0089, G01L9/0091 take precedence
• CPC Class Codes: Y10S 73/04 Piezoelectric

Abstract

A transducer device for measuring mechanical values on hollow bodies, such as the internal pressure in pipes, by detecting deformation in the outer surface thereof, comprises a housing for removably enclosing the hollow body whose outer surface deformation is to be measured and at least one elastic sensor element which is capable of being elastically and at least indirectly pressed against the outer surface of the hollow body by an elastic endorsing element and capable of stretching due to the deformation of the hollow body due to frictional contact therewith. The endorsing element is combined with the sensor element and/or at least a part of the housing into one piece, whereby manufacture and adjustment of the transducer device are simplified.

Claims

1. A transducer device for measuring mechanical values on hollow bodies, such as the internal pressure in pipes, by detecting deformations at the outer surface thereof, comprising a removable housing for removably enclosing the hollow body whose outer surface deformation is to be measured, said housing comprising an elastic endorsing element, and at least one elastic sensor member being elastically pressed against the outer surface of said hollow body by said elastic endorsing element said member being capable of stretching due to the deformation of said hollow body due to the frictional contact therewith, and wherein said endorsing element and said sensor element are of one-piece construction.

2. A transducer device according to claim 1, wherein either part of said housing is provided with at least one area of reduced wall thickness, which is capable of being deformed by the outer surface of said hollow body and forms the one-piece sensor/endorsing element construction which is at least locally sensitive.

3. A transducer device according to claim 2, wherein a hermetically sealed chamber is provided between said sensor/endorsing element and said housing, which is filled with a pressurized medium.

4. A transducer device according to claim 3, wherein said hermetically sealed chamber is capable of being pressurized from an outside pressure source.

5. A transducer device according to claim 1, wherein said elastic sensor member includes an electrically conductive inner contact layer in direct frictional contact with said hollow body and has a bi-polar signal take-off via said housing.

6. A transducer device for measuring mechanical values on hollow bodies, such as the internal pressure in pipes, by detecting deformations at the outer surface thereof, comprising a removable housing for removably enclosing the hollow body whose outer surface deformation is to be measured, said housing comprising an elastic endorsing element, and at least one elastic sensor member being elastically pressed against the outer surface of said hollow body by said elastic endorsing element, said member being capable of stretching due to the deformation of said hollow body due to the frictional contact therewith, and wherein said endorsing element and at lesat a part of said housing are of one-piece construction.

7. A transducer device according to claim 6, wherein said elastic sensor member includes an electrically conductive inner contact layer in direct frictional contact with said hollow body and has a bi-polar signal take-off via said housing.

8. A transducer device for measuring mechanical values on hollow bodies, such as the internal pressure in pipes, by detecting deformations at the outer surface thereof, comprising a removable housing for removably enclosing the hollow body whose outer surface deformation is to be measured, said housing comprising an elastic endorsing element, and at least one elastic sensor member being elastically pressed against the outer surface of said hollow body by said elastic endorsing element said member being capable of stretching due to the deformation of said hollow body due to the frictional contact therewith, and wherein said endorsing element, said sensor element and at least a part of said housing are of one-piece construction.

9. A transducer device according to claim 8, wherein said elastic sensor member includes an electrically conductive inner contact layer in direct frictional contact with said hollow body and has a bi-polar signal take-off via said housing.