Patent ID: 8387162

Claim:
A hinge coupling structure usable with a welding mask, a face shield or a safety helmet, which serves to connect either side of a protective mask, configured to cover a welder's face along with a viewing window, to a corresponding end of a head band used to assist a welder in wearing the protective mask, the hinge coupling structure comprising: a rail longitudinally provided at the head band; a slider coupled to the rail so as to be moved forward or rearward in a longitudinal direction of the rail; and a hinge unit coupled to the protective mask while being coupled to the slider interposed therebetween, wherein the hinge unit includes: a stator centrally provided with a bolt and configured to be coupled with the slider; a rotator rotatably fastened onto the bolt of the stator and configured to penetrate the protective mask to thereby be fixed inside the protective mask; a washer having a central aperture, through which the bolt is fastened, and configured to be key-coupled with the rotator at an outside of the protective mask; and a knob centrally provided with a nut, through which the bolt is fastened.