IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0858666
(1992-03-27)
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발명자
/ 주소 |
- Varrin
- Jr. Robert D. (Newton MA)
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| 출원인 / 주소 |
- Travis
- Donald (Granite Springs NY 14a part interest)
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| 인용정보 |
피인용 횟수 :
39 인용 특허 :
0 |
초록
▼
The mechanical stress indicator includes two stress indicating rings disposed between engagable fasteners. The stress indicating rings can assume three distinct cooperative positions, corresponding to a less than optimally tight condition of the fastener, an optimum tightness condition and an overti
The mechanical stress indicator includes two stress indicating rings disposed between engagable fasteners. The stress indicating rings can assume three distinct cooperative positions, corresponding to a less than optimally tight condition of the fastener, an optimum tightness condition and an overtight condition. When the fastener arrangement is in the less than optimally tight condition the mos visually predominant surfaces are of a first code, which can be a first color. When the fastener arrangement is tightened to an optimum tightness condition the stress indicator is deflected and the most visually predominant surfaces, which differ from those of the less than optimally tight condition, are of a second code, which can be a second color that corresponds with the optimum torque condition. When the fastener arrangement is tightened to an overtight condition the stress indicating rings are deflected to a third position wherein the most visually predominant surfaces are of a third code, which can be a third color corresponding to the overtight condition. The stress indicator can include a fixed non-deflectable base ring that is also coded with a color to cooperate with the deflectable rings. A deflector stub can be formed on one of the fastener members to facilitate deflection of the stress indicator rings from an optimum tightness condition to an overtight condition.
대표청구항
▼
A mechanical stress indicator kit for a fitting comprising, a) first and second nestable annular spring washers having, in diametrical cross section, the profile of a frustum of a cone, b) each of said washers having first and second surfaces and an unstressed condition wherein said first surfaces h
A mechanical stress indicator kit for a fitting comprising, a) first and second nestable annular spring washers having, in diametrical cross section, the profile of a frustum of a cone, b) each of said washers having first and second surfaces and an unstressed condition wherein said first surfaces have an outside taper and said second surfaces have an inside taper, i) said washers being respectively deflectable in response to respective predetermined first and second stresses such that each said first surface when deflected has an inside taper and each said second surface when deflected has an outside taper, one of said washers being redeflectable from the deflected condition to a redeflected condition wherein said first surface, when redeflected, has an outside taper and said second surface, when redeflected, has an inside taper, ii) said first surface of each said washer having a first indicia, said second surface of said first washer having a second indicia, and said second surface of said second washer having a third indicia, iii) said first, second and third indicia being different, c) said first and second washers adapted to be supported in a predetermined position in the unstressed condition between two engageable members of a fitting that, when engaged, are relatively movable toward each other to tighten said fitting against said washers to squeeze the washers between the fitting members and exert stress on the washers when said fitting is being tightened, the predetermined position of said washers characterized by the first surfaces with outside taper of each of said washers confronting each other without nesting, to expose the first indicia on each of said first surfaces, to signify when said fitting is in a less than optimally tight condition, d) said first washer having a first predetermined spring constant such that said first washer is deflectable against said second washer in response to a first predetermined stress imposed by the engagable members of said fitting on said first washer when said engagable members are tightened to an optimally tight condition wherein the deflected first surface with inside taper of the first washer is netable over the first surface with outside taper of the second washer to conceal the first indicia on the first surfaces of each of said washers and expose the second indicia on the deflected second surface with outside taper of said first washer to signify that said fitting is in the optimum tightness condition, e) said second washer having a second predetermined spring constant such that said second washer can deflect in response to a second predetermined stress imposed on the second washer by the engageable members of said fitting when said engagable members are tightened beyond the optimum tightness condition to a predetermined overtight condition, and upon such deflection of the second washer, the second washer is adapted to cause the nested first washer to redeflect wherein the redeflected first surface with outside taper of the first washer is nestable in the deflected first surface with inside taper of the second washer to conceal the first indicia on the first surfaces of said washers, and expose the third indicia on the deflected second surface with outside taper of the second washer to signify that sad fitting is in said predetermined overtight condition.
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