Expanded – threaded – driven – headed – tool-deformed – or locked-thr – With means to indicate application of predetermined... – Axially deformable member or portion
Patent
1990-02-23
1991-01-29
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
049882465
ABSTRACT:
Apparatus for indicating incomplete and complete fastening of a screw includes a washer and a ring of a generally flat synthetic resin sheet. The washer includes a pair of washer portions of a generally flat, round shape and a joint portion interconnecting the washer portions to face them in opposite directions to enable the washer portions to receive a shank of a screw in the openings thereof. The lengthwise section of the joint portion forms generally a U shape. The ring is made of a generally round, deformable material and is inserted between the pair of washer portions thus facing each other. The deformable material is expanded radially outward, when compressed by the washer portions receiving the shank of the screw when fastened. Upon the compressive force reaching a predetermined value, the ring will be broken due to the pair of washer portions overlaying one another.
REFERENCES:
patent: 3469492 (1969-09-01), Dahl
patent: 3504591 (1970-04-01), Christophersen
patent: 3561317 (1969-04-01), Rowell
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patent: 4020734 (1977-05-01), Bell
patent: 4303001 (1981-12-01), Trungold
patent: 4322193 (1982-03-01), Stahl
patent: 4483648 (1984-11-01), Trungold
Arai Teruo
Hayajiri Kazutami
Hirai Shigo
Ichida Tosio
Ishii Nobuyuki
Kyodo Electric Co., Ltd.
Wilson Neill R.
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