US3792226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eye protector for welders
Assignee: United States Department of the Army
•
Filing: 1972-08-29
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Granted: 1974-02-12
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Expires: 1992-08-29
Abstract
Abstract A fail-safe eye protector for welders consisting of a spring loaded, darkened window-hinged over a clear glass window on a welder''s hood and an electrode hand holder having a spring loaded grip switch bridging a pair of contacts when fully closed. One contact is in circuitry with a solenoid mounted on the hood while a second circuit connects a micro-limit switch, operated by the darkened window, to the other contact. When the grip switch is pressed to the first contact the solenoid closes the darkened window and when pressed fully closed it bridges both contacts to strike the arc. Full release of the grip switch breaks both circuits and the darkened window opens. A safety switch in the secondary circuit prevents malfunction of the system.
Inventors
- 👤 C Bush
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:00
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/04; A61F9/06; A61F9/061
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
151 words
A welder''s protective device comprising a face hood and electrode holder, said hood including a viewing portion together with screening sheet having movement actuating means and solenoid restraining means associated therewith; a first terminal in the electrode holder with electrical conducting means connecting the solenoid thereto and defining the solenoid circuit, electrode mounting means in the holder defining a second terminal and forming part of an arc circuit, and power receiving means also positioned therein; switch means in said electrode holder active in one position to selectively connect the power receiving means solely to the solenoid circuit for releasing the solenoid restraining means and active in a second position to connect the arc circuit thRough the solenoid circuit whereby the screening sheet may be operated independently of the electrode holder while maintaining the operation of the electrode holder dependent upon a closed solenoid circuit and the release of the screening sheet.
Claim 2
Dependent Claim
151 words
A welder''s protective device comprising a face hood and electrode holder, said hood including a viewing portion together with screening sheet having movement actuating means and solenoid restraining means associated therewith; a first terminal in the electrode holder with electrical conducting means connecting the solenoid thereto and defining the solenoid circuit, electrode mounting means in the holder defining a second terminal and forming part of an arc circuit, and power receiving means also positioned therein; switch means in said electrode holder active in one position to selectively connect the power receiving means solely to the solenoid circuit for releasing the solenoid restraining means and active in a second position to connect the arc circuit thRough the solenoid circuit whereby the screening sheet may be operated independently of the electrode holder while maintaining the operation of the electrode holder dependent upon a closed solenoid circuit and the release of the screening sheet.
Claim 3
Dependent Claim
94 words
A protective device according to claim 1 including a micro switch in the arc circuit, an auxiliary circuit operable to actuate the micro switch when closed and plunger means on the face hood adjacent the closing terminus of the screening sheet and defining a safety switch in the auxiliary circuit, said plunger closing the auxiliary circuit when depressed by the screening sheet to effect the closing of the arc circuit whereby the operation of the electrode holder is further dependent upon the complete closing of the face hood viewing portion by the screening sheet.
Claim 4
Dependent Claim
22 words
A protective device according to claim 2 including means for separation of the electrical circuitry between the hood and the electrode holder.
References Cited (Backward Citations)
US2171052A
Cited
US2582860A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |