Method for creating overload protection against yielding in bolt

Details Method for creating overload protection against yielding in bolt Method for creating overload protection against yielding in bolt

1977-07-18

1979-03-06

Gilden, Leon

29407, 29526R, 73761, F16B 3102

Patent

active

041422660

ABSTRACT:
An improved method for creating built-in overload protection against further yielding in a bolt which previously has been tightened to its yield point, the method comprising rotating the bolt head or nut in the direction opposite from tightening while measuring the wrenching torque required for this rotation and stopping the rotation when the magnitude of the wrenching torque indicates that the torque acting in the bolt shank is fifty percent or less of the value existing at the end of tightening; and, a pulsed air motor wrench which at the end of tightening a bolt to its yield point automatically shifts to an untightening mode of operation and stops untightening when the untightening wrenching torque becomes equal to or exceeds the value CT.sub.WY wherein C is a numerical constant determined theoretically or experimentally and T.sub.WY is the wrenching torque acting at the end of tighening.

REFERENCES:
patent: 4016938 (1977-04-01), Rice
patent: 4026369 (1977-05-01), Vliet
patent: 4037282 (1977-07-01), Dahl

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