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United States Patent | 3,881,392 |
Curtis | May 6, 1975 |
A tension indicating fastener unit which includes a conical spring washer assembled on a threaded fastener and a ring gauge assembled between the conical washer and the bearing surface of the threaded fastener. The ring gauge will include an inwardly projecting flange adapted to be pinched between the conical washer and the bearing surface of the fastener when the washer has been compressed a predetermined amount.
Inventors: | Curtis; Gary Martin (Elgin, IL) |
Assignee: |
Illinois Tool Works Inc.
(Chicago,
IL)
|
Appl. No.: | 05/437,597 |
Filed: | January 28, 1974 |
Current U.S. Class: | 411/11 ; 411/957 |
Current International Class: | F16B 31/02 (20060101); F16B 31/00 (20060101); F16b 031/02 (); F16b 039/24 () |
Field of Search: | 85/62,61 151/35,38,37 |
1923647 | August 1933 | Vera |
2151919 | March 1939 | Jacobson |
2464152 | March 1949 | Ralston |
3153974 | October 1964 | Canning |
3474701 | October 1969 | Setzler |
3476010 | November 1969 | Markey |
3550498 | December 1970 | Briles |
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