| 摘要 |
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.
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