Expanded – threaded – driven – headed – tool-deformed – or locked-thr – With means to indicate application of predetermined... – Color indicator
Patent
1989-03-09
1990-02-27
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
With means to indicate application of predetermined...
Color indicator
411 14, 116DIG34, F16B 3112
Patent
active
049041320
ABSTRACT:
In an indicator for visually displaying extremely small displacements between two points within a structure, a change of color visible through an indicator window occurs during a preselected portion of a predetermined displacement within the structure. The color change occurs due to an increase in thickness of a light-absorbing fluid in the central area of a clear, flexible indicator means separating a colored portion from the indicator window. Substantially no light-absorbing fluid is permitted to enter the central area until a preselected displacement has occurred since the colored portion is firmly, resiliently biased against the indicator window until that amount of displacement has occurred. Thereafter, light-absorbing fluid is permitted to enter the central area. This device concentrates visual indications of displacements into limited segments of an overall displacement.
REFERENCES:
patent: 3987699 (1976-10-01), Popenoe
patent: 4771999 (1988-09-01), Takeuchi et al.
patent: 4793751 (1988-12-01), Takeuchi et al.
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