Apparel – Guard or protector – For wearer's head
Patent
1988-10-31
1990-07-03
Nerbun, Peter
Apparel
Guard or protector
For wearer's head
219147, A61F 906
Patent
active
049378791
ABSTRACT:
An automatic rotatable welding helmet for TIG and MIG electric arc welding systems having safety means preventing the arc cycle from commencing until the helmet is in the fully down position. An arc welding helmet is provided having a hood with eye shield, connected by pivoting means to an interior head band harness. The hood has an exteriorly mounted base supporting a bi-directional piston and cylinder mechanism which, under actuation by a source of compressed air, pushes against a cam connected at the pivot, resulting in rotation of the helmet from the fully open to the fully closed position, and vice versa. In operation, the welder presses a welding cycle activation switch which effects, through a control box, to deliver compressed air to one end of the cylinder, forcing the piston outward against the cam, thereby rotating the helmet. A safety switch mounted to the base, assures positive protection against the arc cycle being started until the helmet is in the fully down position. Release of the foot pedal deactivates the arc, and, via the control box, directs compressed air to the other end of the cylinder, opening the helmet.
REFERENCES:
patent: 2471719 (1949-05-01), Broffitt
patent: 2678369 (1954-05-01), Van Hook
patent: 3096430 (1963-07-01), Farr
patent: 3692974 (1972-09-01), Thomason
patent: 3719793 (1973-03-01), Finger
patent: 3792226 (1974-02-01), Bush
patent: 3838247 (1974-09-01), Finger
patent: 4293757 (1981-10-01), Niemi
patent: 4571741 (1986-02-01), Guillaumot
Hall David R.
Steele Mark
Keefe Peter D.
Nerbun Peter
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