Patent ID: 7134149

Claim:
A face mask comprising: a front lens; a skirt extending rearward from said front lens; a lens frame adapted to fix a front end of said skirt to a peripheral edge of said lens; a strap put around a mask wearer's head and buckles, and means for rotatably coupling each buckle to a respective side wall of said lens frame, the buckles used to adjust a length of said strap along its longitudinally opposite extremities, respectively; and means for retaining each of said rotatably coupled buckles in a predetermined rotatable position with respect to said side wall, said retaining means further comprising a first engagement member formed on each of said side walls of said lens frame and a second engagement member formed on said buckle associated with said side wall and one of said first and second engagement members is provided in the form of a plurality of depressions and the other is provided in the form of a protrusion adapted to be releasably engaged with one of said depressions while each said buckle is rotatably coupled to each said side wall to position said buckle in said predetermined rotatable position.