US3692974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic welding hood with automatically positioned eye shield
Assignee: Individual
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Filing: 1970-10-26
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Granted: 1972-09-19
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Expires: 1990-10-26
Abstract
Abstract A welding hood having an electromechanical system for automatically opening and closing a hinged eye shield located thereon and for controlling energization of the welding gun at the beginning or end of a welding operation. On starting the welding process, a manually operated switch actuates a first solenoid valve which stops the flow of fluid to a piston connected to the eye shield, thereby allowing a spring providing an opposing force to move the eye shield to its protective position in front of the welding operator''s eyes. The switch also actuates a second solenoid valve which allows an inert gas to flow through the welding gun. As the eye shield assumes its protective closed position, a microswitch is actuated along with a relay coil, completing a circuit allowing the welding gun to energize. Upon compeltion of the welding process, the eye shield automatically retracts so that the operator may view his work.
Inventors
- 👤 James P Thomason
- 👤 Thomas Harold Jennings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:41
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/04; A61F9/06; A61F9/061
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
276 words
A welding system comprising a welding means, an electric circuit for controlling the operation of said welding means, a welding hood having an eye shield mounted thereon, said shield being movable between an operative position in the line of sight of a welder wearing said hood and an inoperative position removed from such line, a switch mounted on said hood and controlling the circuit for said welding means, means connecting said switch with said eye shield in such a manner that the switch will be closed when the shield is in operative position and open when the shield is in inoperative position, whereby the welding means will be rendered inoperative unless the shield is in operative position; means for moving said eye shield between its operative and inoperative positions, comprising a cylinder, a piston therein operatively connected to said eye shield, a spring urging said piston toward a position in which said eye shield is in operative position, means for supplying fluid to said cylinder to cause the piston to move against the action of the spring, thereby moving said eye shield to inoperative position, a valve for controlling said fluid supplying means, means for supplying a flow of inert gas to said welding means, a valve for controlling the supply of such gas, solenoid means connected with both said valves and adapted, in one position to simultaneously close the valve controlling the supply of fluid to said cylinder and open the valve controlling the supply of inert gas and in another position to open the former valve and close the latter valve, and a switch for controlling the supply of current to said solenoid means.
Claim 2
Dependent Claim
276 words
A welding system comprising a welding means, an electric circuit for controlling the operation of said welding means, a welding hood having an eye shield mounted thereon, said shield being movable between an operative position in the line of sight of a welder wearing said hood and an inoperative position removed from such line, a switch mounted on said hood and controlling the circuit for said welding means, means connecting said switch with said eye shield in such a manner that the switch will be closed when the shield is in operative position and open when the shield is in inoperative position, whereby the welding means will be rendered inoperative unless the shield is in operative position; means for moving said eye shield between its operative and inoperative positions, comprising a cylinder, a piston therein operatively connected to said eye shield, a spring urging said piston toward a position in which said eye shield is in operative position, means for supplying fluid to said cylinder to cause the piston to move against the action of the spring, thereby moving said eye shield to inoperative position, a valve for controlling said fluid supplying means, means for supplying a flow of inert gas to said welding means, a valve for controlling the supply of such gas, solenoid means connected with both said valves and adapted, in one position to simultaneously close the valve controlling the supply of fluid to said cylinder and open the valve controlling the supply of inert gas and in another position to open the former valve and close the latter valve, and a switch for controlling the supply of current to said solenoid means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |