Lens clamping assembly for gas masks

Claim 1

A FACE MASK INCLUDING A FACE PIECE PROVIDED WITH A LENS RECEIVING OPENING OF SUBSTANTIALLY OVAL SHAPE BOUNDED BY A CHANNEL SHAPED BEAD PORTION HAVING A GROOVE, A LENS HAVING A PERIMETRICAL PORTION SNUGLY FITTED IN SAID GROOVE, AND A CLAMPING ASSEMBLY FOR CLAMPING THE SIDEWALLS OF SAID BEAD PORTION THROUGHOUT THE PERIMETER OF SAID BEAD PORTION, COMPRISING A PAIR OF WIRES EXTENDING SNUGLY DIRECTLY AGAINST THE ENTIRE LENGTH OF THE SIDEWALLS OF SAID BEAD PORTION SO AS TO COMPRESS SAID SIDEWALLS, A PLURALITY OF EVENLY SPACED, INVERTED U-SHAPED CLAMPING ELEMENTS BRIDGING SAID WIRES AND SNUGLY EMBRACING THREE ADJOINING WALLS OF SAID BEADS, FORMING THE CHANNEL SHAPE, THE INNER SURFACES OF OPPOSING SIDES OF SAID CLAMPING ELEMENTS HAVING VERTICALLY SPACED PROJECTIONS BETWEEN WHICH SAID WIRES EXTEND AND TO WHICH THE WIRES ARE INTEGRALLY WELDED, A TERMINAL SECURED TO EACH OF TWO FREE ENDS OF SAID CLAMPING ASSEMBLY EACH TERMINAL COMPRISING AN INVERTED U-SHAPED ELEMENT HAVING A PLURALITY OF DEPENDING LEGS EXTENDING FROM EACH SIDE OF THE ELEMENT, AND INCLUDING CLAMPING MEANS EXTENDING OUTWARDLY OF SAID CLAMPING ELEMENTS FOR DRAWING TOGETHER SAID TWO FREE ENDS SO AS TO FORM AN ENDLESS LOOP FOR TIGHTLY GRASPING SAID BEAD.