Tightening system with torque-time control

Details Tightening system with torque-time control Tightening system with torque-time control

1976-03-31

1977-05-17

Myracle, Jerry W.

Measuring and testing

Brake testing

Single wheel rotating and resistance measuring means

73 88F, G01N 322

Patent

active

040234061

ABSTRACT:
The invention disclosed herein relates to a tightening system including a wrench for applying torque to a fastener system. Associated with the wrench is a control system including measuring means for developing a first signal representative of the torque applied to the fastener. A second signal representative of a constant incremental time is introduced along with the torque signal into gradient calculating means which develops a signal representative of the slope of a torque-time curve which can be plotted for the particular fastener system being tightened. When the gradient signal falls to a predetermined percentage of the maximum previously stored gradient signal, at the yield point of the fastener system or some similarly significant point on the torque-time curve, a control signal is generated stopping the tightening of the fastener.

REFERENCES:
patent: 3643501 (1972-02-01), Pauley
patent: 3693726 (1972-09-01), Hornig et al.
patent: 3825912 (1974-07-01), Wiese et al.
patent: 3962910 (1976-06-01), Spyridakis et al.

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