Simplified fastening technique using the logarithmic rate method

Details Simplified fastening technique using the logarithmic rate method Simplified fastening technique using the logarithmic rate method

1980-01-10

1981-12-15

Nerbun, Peter P.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

73761, 7386223, B25B 23147

Patent

active

043054714

ABSTRACT:
A fastening tool, which is preferably portable, incorporates torque and angle sensors connected to an analog calculating circuit which determines, while tightening below the yield point of any component of the joint being tightened, a final shut off parameter which varies from joint to joint while tightening seriatim a plurality of substantially identical joints. The logarithimic rate method is used to determine the final shut off parameter. In accordance with one embodiment of the invention, a simplification occurs by the measurement of an angle interval occurring between two predetermined torque values. In accordance with another embodiment of the invention, a simplification occurs by measuring the torque value existing at a predetermined angle interval beyond a first predetermined torque level.

REFERENCES:
patent: 4000782 (1977-01-01), Finkelston
patent: 4104779 (1978-08-01), Sigmund
patent: 4163310 (1979-08-01), Sigmund
patent: 4244245 (1981-01-01), Wallace et al.

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