Torque control impact wrench
Abstract
Abstract A ROTARY IMPACT WRENCH CONTAINING A MOTOR, A ROTARY IMPACT MECHANISM, AND A SPINDLE ADAPTED TO DRIVE A FASTENER. A RESILIENT TORSION BAR IS MOUNTED EITHER BETWEEN THE MOTOR AND THE IMPACT MECHANISM OR THE IMPACT MECHANISM AND THE SPINDLE AND INCLUDES A MEMBER FOR PRELOADING OR PREWINDING THE TORSION BAR SO THAT IT DOES NOT WIND UP FURTHER UNTIL AFTER THE TORQUE ON THE TORSIONS BAR EXCEEDS A SELECTED VALUE. A SHUT-OFF VALVE IN THE WRENCH IS CONNECTED TO A HOLLOW PASSAGE EXTENDING THROUGH THE TORSION BAR AND TERMINATING IN AN EXIT PORT WHICH IS NORMALLY CLOSED Y THE PRELOADING MEANS AND IS OPENED WHEN THE TORSION BAR WINDS UP FURTHER IN RESPONSE TO THE RISE OF TORQUE ON THE TORSION BAR ABOVE THE SELECTED VALUES OF TORQUE, RESULTING IN CREATING A FLUID SIGNAL WHICH CAUSES THE VALVE TO SHUT OFF THE POWER SUPPLY TO THE WRENCH MOTOR.
Inventors
- 👤 Hanns Hornschuch
- 👤 Reginald W Pauley
- 👤 Leo Kramer
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |