Tightening system

Details Tightening system Tightening system

1975-05-19

1977-02-22

Purser, Ernest R.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

73136A, 73139, B23Q 506

Patent

active

040087727

ABSTRACT:
The preferred embodiments of the invention disclosed herein relate to a tightening system comprising a wrench for rotating and applying torque to a fastener system, means for developing a signal representative of the torque being applied and means for developing a signal representative of the rotation. The signals are compared and the total rotation signal is increased when the torque signal is increasing at a faster rate than the rotation signal so that the rotation signal corresponds to the torque signal. When the torque signal decreases relative to the rotation signal the rotation signal cannot decrease and a decision-making signal is developed which is processed to develop a control signal when a yield point of the fastener system is detected.

REFERENCES:
patent: 2756622 (1956-07-01), La Belle
patent: 3643501 (1972-02-01), Parley
patent: 3693726 (1972-09-01), Hornig et al.
patent: 3724558 (1973-04-01), Rundell et al.

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