Threaded joint making apparatus having a d.c. power supply

Details Threaded joint making apparatus having a d.c. power supply Threaded joint making apparatus having a d.c. power supply

1978-09-12

1980-06-24

Ruehl, Charles A.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

Threaded fastener stress

73139, B25B 2314

Patent

active

042089190

ABSTRACT:
An apparatus is provided for making threaded joints, such as pipe joints, including means for storing and indicating values of the actual torque applied to one of the members being rotated with respect to the other member and values of actual turns made by the one member and a d.c. power supply for powering the storage and indicating means. The power supply is connected to a first source of power such as an a.c.-to-d.c. converter for normal operation. The power supply generates a predetermined magnitude voltage and has means responsive to the predetermined magnitude value for switching to a second source of power, such as a battery, when the first source of power fails. The power supply also includes a d.c.-to-d.c. inverter having transistor switching means connected between a transformer and a power source. The transistor switching means are switched on and off to induce current flow in the transformer secondary to generate the power to the storage and indicating means. A transistor is connected to be responsive to the turning off of the transistor switching means for rapidly discharging a stored base charge to increase the efficiency of the power supply.

REFERENCES:
patent: 4005409 (1977-01-01), Feuer
patent: 4063306 (1977-12-01), Perkins et al.
patent: 4091451 (1978-05-01), Weiner et al.
patent: 4122359 (1978-10-01), Breikss
patent: 4143283 (1979-03-01), Graf et al.

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