US Patent: 4,182,979
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| D. C. Electric Torquing System
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Patentees:
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| Robert L. Douglas (exact or similar names) - Janesville, Rock County, WI |
| William P. Jezo (exact or similar names) - Janesville, Rock County, WI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Feb. 03, 1978 |
| Granted: |
Jan. 08, 1980 |
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Joel Havens
"Vintage Machinery" entry for Giddings & Lewis Manufacturing Co.
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Description: |
| Abstract:
An electric torqueing device comprises a d-c. motor for producing an output torque that varies in proportion to variations in the armature current, a power source for supplying d-c. current to the armature to produce an output torque, and regulating means for maintaining the d-c. current at a relatively low level during the run-on stage of a torqueing operation. Sensing means responsive to a preselected parameter of the torqueing operation, such as the velocity of the motor output, produces a control signal when the tightening stage of the torqueing operation begins. Control means responsive to the control signal from the sensing means adjusts the regulation of the d-c. current to maintain the current supply to the armature at a relatively high level during the tightening stage of the torqueing operation. |
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