Direct tension indicator washer

Details Direct tension indicator washer Direct tension indicator washer

1993-06-24

1994-12-06

Wilson, Neill R.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

With means to indicate application of predetermined...

Axially deformable member or portion

411 14, 116DIG34, F16B 3102

Patent

active

053704835

ABSTRACT:
A pre-load indicating washer in which a plurality of protuberances, struck and partially sheared from the annular body of the washer, are pushed under load back into a corresponding plurality of indentations in the annular body which are formed when the protuberances are formed. The mass of material defined by each protuberance/indentation pair is concentrated along the lengthwise central region of the protuberance/indentation pair, thereby stiffening the protuberance, so that when load is applied to the washer, the protuberance will first undergo elastic deformation prior to collapsing back into the indentation from which it was formed.

REFERENCES:
patent: 2570863 (1951-10-01), Rowe
patent: 3187621 (1965-06-01), Turner
patent: 3285120 (1966-11-01), Kartiala
patent: 3512447 (1970-05-01), Vaughn
patent: 3534651 (1970-10-01), Belfiglio
patent: 4020734 (1977-05-01), Bell
patent: 4518295 (1985-05-01), Matuschek
patent: 4692076 (1987-09-01), Herb
patent: 4773272 (1988-09-01), Trungold
patent: 4887948 (1989-12-01), Calmettes
patent: 4889457 (1989-12-01), Hageman
patent: 5015132 (1991-05-01), Turner et al.

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