Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Threaded fastener stress
Patent
1979-08-02
1980-10-07
Ruehl, Charles A.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Threaded fastener stress
73139, B25B 23142
Patent
active
042261279
ABSTRACT:
A hand operated tightening system for tightening a fastener assembly to its yield point is disclosed. The system includes a wrench for applying torque to a threaded fastener and means for mechanically differentiating the magnitude of torque applied with respect to the degree of rotation of the fastener. This differential represents the slope of the torque-rotation curve of the particular fastener assembly being tightened and is a constant while in the elastic range. Means are provided to signal a change in the magnitude of the differential so as to indicate when the yield point of the assembly has been reached. In one embodiment, the differentiating means emits an audible signal which is used to indicate that the yield point has been reached.
REFERENCES:
patent: 2315521 (1943-04-01), Hart
patent: 3643501 (1972-02-01), Pauley
patent: 3693726 (1972-09-01), Hornig et al.
Nerenberg Aaron
Ruehl Charles A.
SPS Technologies, Inc.
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