Welding helmet

Claim 1

A HELMET FOR A WELDER TO BE WORN ON THE HEAD OF SAID WELDER, SAID HELMET COMPRISING A FIRST IMPERFORATE RIGID WALL OPAQUE TO THE LIGHT RAYS EMANATING FROM A WELDING ARC, SAID WALL BEING FORMED OF AN ELECTRICALLY INSULATING MATERIAL HAVING A SMOOTH, REFLECTIVE OUTER SURFACE AND A DULL INNER SURFACE AND AN APERTURE IN SAID FIRST WALL, AND A SECOND RIGID IMPERFORATE OPAQUE WALL FIXED AT AN ANGLE TO SAID FIRST WALL AND FORMED OF AN ELECTRICALLY INSULATING MATERIAL HAVING A SMOOTH, REFLECTIVE OUTER SURFACE AND A DULL, INTERIOR INNER SURFACE, FIRST MEANS FIRMLY AND PERMANENTLY JOINING SAID SECOND PLATE AND SAID FIRST PLATE TO EACH OTHER AT A LIGHT-TIGHT JOINT, A RIGID HOLLOW CONDUIT STRUCTURE ON THE REAR SURFACE OF SAID FIRST PLATE AND THE HEAD OF THE WELDER WEARING THE APPARATUS, THE UPPER WALL HAVING A REAR EDGE SMOOTHLY CURVED CONCAVE TO THE REAR FROM NEAR TO ONE EDGE THEREOF TO NEAR THE OTHER EDGE THEREOF AND ADAPTED TO FIT THE FOREHEAD OF THE WEARER, THE LOWER WALL HAVING LATERAL REAR EDGE PORTIONS EACH OF WHICH IS SMOOTHLY CURVED CONCAVE TO THE REAR AND ADAPTED TO FIT THE CHEEKBONE OF SAID WEARER AND SAID REAR EDGE OF SAID LOWER WALL PROVIDED WITH A CENTRAL CURVED PORTION CONCAVE TO THE REAR AND OF LESSER RADIUS OF CURVATURE THAN THE RADIUS OF CURVATURE OF SAID LATERAL PORTIONS OF THE LOWER WALL REAR EDGE AND ADJACENT THERETO AND ADAPTED TO PROVIDE AN APERTURE FOR THE NOSE OF THE WEARER, THE REAR OF THE FIRST WALL BEING SPACED AWAY FROM THE FRONT PORTION OF SAID CENTRAL CURVED PORTION AND ADAPTED TO HOLD THE REAR OF SAID SAID FIRST WALL AND FIRMLY ATTACHED THERETO, SAID STRUCTURE BEING FIRMLY ATTACHED TO THE INNER SURFACE OF SAID SECOND WALL, AND SAID STRUCTURE COMPRISING RIGID AND IMPERFORATE TOP, BOTTOM AND SIDE WALLS EACH FIRMLY JOINED TO EACH OTHER WITH LIGHT-TIGHT JOINTS, SECOND MEANS FIRMLY ATTACHING SAID FIRST WALL TO SAID RIGID STRUCTURE WITH LIGHT-TIGHT JOINTS THEREBETWEEN, THIRD MEANS FIRMLY AND RIGIDLY ATTACHING SAID SECOND WALL TO A SIDE OF SAID CONDUIT STRUCTURE, A FILTER GLASS AND A PROTECTIVE SHEET FOR SAID FILTER GLASS AT THE FORWARD END OF SAID RIGID STRUCTURE, FOURTH MEANS URGING SAID GLASSES TOWARD AND BEING HELD BY THE INNER PORTION OF SAID ORIFICE, SAID RIGID CONDUIT STRUCTURE ADAPTED TO EXTEND BETWEEN FIRST WALL SPACED AWAY FROM THE NOSE OF SAID WEARER, SAID SECOND WALL BEING SPACED AWAY FROM THE RIGID HOLLOW CONDUIT STRUCTURE BY SAID THIRD MEANS AND ADAPTED TO SPACE AWAY SAID SECOND PLATE FROM THE EAR OF SAID WEARER, RESILIENT MEANS ADAPTED TO EXTEND FROM THE REAR OF SAID RIGID STRUCTURE ABOUT THE OCCIPITAL STRUCTURE OF THE SKULL OF THE WEARER TO FIRMLY HOLD SAID APPARATUS TO SAID WEARER, WITH AN EMPTY SPACE BETWEEN THE FACE OF THE WEARER AND SAID FIRST AND SECOND WALLS, SAID SPACE BEING OPEN AT ITS BOTTOM, ITS TOP AND AT ONE SIDE, SAID FIRST PLATE ADAPTED TO EXTEND FROM THE HEAD OF THE WEARER TO BELOW HIS CHIN.