Yield torque apparatus

Details Yield torque apparatus Yield torque apparatus

1975-10-06

1977-05-31

Purser, Ernest R.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

81 524B, E21C 500

Patent

active

040263690

ABSTRACT:
A wrenching apparatus for torquing a fastener to its yield point and automatically shutting off once the yield point is reached. The yield point is sensed by having the wrenching apparatus resiliently restrained and creating a pulse signal in response to an increment of restraint. Rotational output of the wrenching apparatus also creates a pulse for each increment of rotation chosen. The rotational pulses are counted and the restraint pulses are utilized to cancel the sum of the rotational pulses. The yield point is detected when the sum of the rotational pulses exceeds a predetermined number without having received a restraint pulse cancellation. The count system is activated only after a predetermined level of total restraint is achieved thereby assuring the fastener is seated and the fastener tension is increasing in its linear range.

REFERENCES:
patent: 3520215 (1970-07-01), Lucenti et al.
patent: 3623557 (1971-11-01), Allen
patent: 3643501 (1972-02-01), Pauley
patent: 3693726 (1972-09-01), Hornig
patent: 3745820 (1973-07-01), Weiner

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