Welding helmet
Abstract
Abstract A WELDING HELMET INCLUDNG A HEAD HARNESS AND SHIELD WITH A WORK VIEWING OPENING THERETHROUGH ANDA DARK GLASS SLIDABLE BETWEEN A POSITION OVERLYING THE OPENING AND A POSITION ADJACENT THE OPENING. THE DARK GLASS IS BIASED INTO THE OVERLYING POSITION BY A SPRING ANDMAINTAONED IN THE ADJACENT POSITION BY A LATCH OPERATED BY A SOLENOID. A ROTARY SWITCH IS MOUNTED BETWEEN THE SHIELD AND THE HARNESS AND ELECTRICALLY CONNECTED IN SERIES WITH THE SOLENOID BETWEEN A POWER SOURCE AND THE WELDING ELECTRODE. A PUSH-BUTTOM SWITCH IS MOUNTED ON THE SHIELD FOR OPERATION BY THE DARK GLASS S THE GLASS MOVES INTO THE OVERLYING POSITION AND IS ELECTRICALLY CONNECTED IN SERIES WITH THE COIL OF A RELAY BETWEN THE POWER SOURCE AND THE WELDING ELECTRODE. SETS OF CONTACTS OF THE RELAY ARE CONNECTED DIRECTLY BETWEEN THE POWER SOURCE AND THE WELDING ELECTRODE.
Inventors
- 👤 J Finger
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) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |