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 Title: |
US5123284:
Method and apparatus for mesurement of tension in an elastic surface
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Edinburgh, John D.; Missouri City, TX 77459
Johnson, Curtis D.; Spring, TX 77379
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| Assignee: |
None
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| Published / Filed: |
1992-06-23
/ 1990-09-26
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| Application Number: |
US1990000588345
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| IPC Code: |
Advanced:
G01L 5/10;
G01N 3/08;
A63B 51/00;
Core:
G01L 5/04;
more...
IPC-7:
G01N 3/08;
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| U.S. Class: |
Current:
073/826;
073/159;
Original:
073/826;
073/159;
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| Field of Search: |
073/826,862.43,838,840,159,862.48,862.45,862.47
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| Priority Number: |
| 1990-09-26 |
US1990000588345 |
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| Abstract: |
A method and apparatus are disclosed for the measurement of tension in a stretched elastic surface. The apparatus includes a rigid housing having at least two diametrically opposed sides and a spring device contained therein with a contact member connected to the spring device which protrudes a predetermined distance outwardly beyond the ends of the housing sides when the spring device is in a resting state. Measuring and display devices are connected to the spring device for measuring the spring deflection when the housing is pressed against an elastsic surface. The housing is placed adjacent the elastic surface to be measured with the contact member in contact with the elastsic surface such that a fixed distance exists between the ends of the housing sides and the surface prior to application of a pressing force. The housing is then pressed against the elastic surface until the ends of the housing sides come into contact with the surface such that the spring device is deflected. The deflection is measured and displayed as an indication of the tension in the elastic surface. In one embodiment the spring device is a cantilever beam with the measuring device being at least one strain gauge mounted thereon. In another embodiment, the spring device is a coil spring with the measuring device being a linear variable differential transformer.
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| Attorney, Agent or Firm: |
Roddy, Kenneth A. ;
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| Primary / Asst. Examiners: |
Myracle, Jerry W.;
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| Maintenance Status: |
E3 Expired Check current status
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| INPADOC Legal Status: |
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| Family: |
None
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First Claim:
Show all 9 claims |
We claim:
1. An apparatus for measuring the tension in a elastic surface comprising;
- a rigid housing having at least two diametrically opposed sides for contacting an elastic surface having a constant of proportionality dependent upon its surface material and the tension of which is to be measured,
- spring means having a predetermined constant of proportionality secured within said housing and having a free end,
- contact means connected to the free end of said spring means and protruding a predetermined distance outwardly beyond the ends of said housing sides for contacting the elastic surface to be measured when said spring means is in a resting state and deflecting said spring means upon sufficient force,
- measuring means including display means operatively connected with said spring means for measuring the spring deflection when said housing is pressed against the elastic surface, such that
- when said housing is placed adjacent an elastic surface to be measured with said contact means in contact with the surface a fixed distance will exist between the ends of the housing sides and the surface prior to application of a pressing force, and
- upon pressing said housing against the elastic surface until the ends of said housing sides come into contact with the surface said contact means will cause deflection of said spring means which is measured by said measuring means and displayed as an indication of the tension in the elastic surface,
- the tension of the elastic surface relative to deflection of said spring means being determined by the equation; [Figure] where T=tension of the elastic surface,
- X=total deflection,
- x=deflection of said spring means,
- S=the spring constant, and
- k=a constant number related to surface material.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 7 U.S. patent(s) that reference this one
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