Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Threaded fastener stress
Patent
1993-08-16
1995-01-31
Noland, Thomas P.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Threaded fastener stress
411 10, F16B 3102
Patent
active
053850548
ABSTRACT:
A device to monitor tension in a fastener assembly such as a stationary bolt and a moveable nut for securing elements therebetween. The device is in the form of a washer for use in the assembly between the nut and the elements or the bolt head and the elements. In one example, a slot is provided in the surface of the washer and extends radially outwardly from the inner periphery thereof. A recess is formed in the bottom of the slot, creating at least one fulcrum point in the slot. A monitor and indicating strip, for example a spring steel, is located in the slot and, under tension from one of the fastener assembly members, the distal end of the strip rises from the slot to provide a visual and measurable monitor of tension in the assembly. In another example, the monitor strip is located on the surface of the washer and the fulcrum is located on one of the fastener elements, such as on the underside of the nut, for engaging the strip under pressure, causing its distal end to rise.
REFERENCES:
patent: 3469492 (1967-07-01), Dahl
patent: 4131050 (1978-12-01), Holmes
patent: 4164164 (1979-08-01), Trungold
patent: 4303001 (1981-12-01), Trungold
patent: 4773272 (1988-09-01), Trungold
patent: 5199835 (1993-08-01), Turner
Noland Thomas P.
Olsen James M.
Phipps Robert M.
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