Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent
1981-03-03
1984-04-24
Schmidt, Frederick R.
Tool driving or impacting
Automatic control of power operated means
Tool advance causing or controlling means
7386223, 7386225, 81467, 173164, B23Q 5027, E21B 1916
Patent
active
044442734
ABSTRACT:
A novel system controls accurately the torque applied to threaded connections by a cathead operating on a tong arm, usually a manual tong. A strain gage/transducer in the catline measures the pull on the tong arm and applies a signal to an electric meter having an adjustable switch/indicator for setting tong arm length to convert the signal to a reading of ft. lb. torque on the meter. a continuous strip chart records the torque and a recall circuit permits recall of the peak torque recorded on the meter after shut down. A thumb screw switch/indicator sets the selected maximum torque and a comparator trips the circuit when the torque exceeds the setting. The trip circuit energizes a solenoid on a three-way valve controlling the supply of air to an air clutch for the cathead. On actuation, the valve moves from a position directing air pressure to the clutch to a position dumping the air pressure from the clutch to stop tensioning of the catline by the cathead. A visual and audible alarm operates if the air pressure from the air clutch has not dropped to zero shortly after the solenoid circuit is energized. Pressure responsive safety means prevents the system from being restarted without first turning off the main air pressure control valve. A selector switch provides for switching the control apparatus between the make up cathead and the break out cathead.
REFERENCES:
patent: 3606664 (1971-09-01), Weiner
patent: 3722331 (1973-03-01), Rodulescu
patent: 4176436 (1979-12-01), McCombs et al.
patent: 4199032 (1980-04-01), Weiner et al.
patent: 4244434 (1981-01-01), Wilson
patent: 4305472 (1981-12-01), Brossette
Mosely Neal J.
Olszewski Robert P.
Schmidt Frederick R.
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