Eye-shield operating system for welding helmets
Abstract
Abstract THE EYE-SHIELD LENS OF A WELDING HELMET IS EXTENDED AND RETRACTED INTO AND OUT OF WORKING POSITION, RESPECTIVELY, BY UNIDIRECTIONAL ROTATION OF A SELF-REVERSING WORK WORKING IN A PAWL ATTACHED TO THE LENS FRAME. THE WORK IS AN EXTENSION OF THE DRIVE SHAFT OF A MINIATURE ELECTRIC MOTOR POWERED BY RECHARGEABLE BATTERIES THROUGH CIRCUITRY ARRANGED TO PROVIDE MAXIMUM STARTING SPEED FOLLOWED BY REDUCED SPEED. STARTING OF THE MOTOR IS CONVENIENTLY CONTROLLED BY A BREATH-OPERATED SWITCH AND STOPPING, AT THE LIMITS OF LENS TRAVEL, BY RESPECTIVE LIMIT SWITCHES. BATTERY RECHARGING TERMINALS ARE PREFERABLY PROVIDED AS SUSPENSION HOOKS TO ENGAGE WITH ELECTRICL POWER TERMINALS OF A STORAGE RACK WHEN THE HELMET IS NOT IN SERVICE.
Inventors
- 👤 Frank J Davis
- 👤 George Zahnor Edwards
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |