| 主权项 |
1. A welding mask system (10) including a face plate for protecting a welder's face from heat and sparks, the system also including a visor for protecting the welder's eyes from light at the discretion of the welder, the protection of the welder's face and the protection of the welder's eyes being done in a safe, convenient and economic manner, the system comprising, in combination:
a head band (14) positionable around a head of a welder above a wearer's eyes and ears, the head band having adjustment mechanisms (16) operable under the control of the welder for adjusting the size of the head band to suit the size of the welder's head, the head band being fabricated of a flexible material; a face plate (20) positionable in front of a face of the welder, the face plate having an interior surface and an exterior surface, the face plate being fabricated of a rigid material, a pair of pivot bolts (22) pivotably coupling the face plate to the head band for movement of the face plate between lowered operative position and a raised inoperative position, the operative position being in front of the face of the welder, the inoperative position being above the face of the welder, a major chamber (24) within the face plate for receiving the face of the welder when in the operative position; a visor housing (28) formed in a central extent of the face plate, the visor housing extending forwardly of eyes of the welder, the visor housing having a forward opening (30) in a rectangular configuration, a minor chamber (32) within the visor housing; a forward assembly (36) fixedly positioned within the minor chamber adjacent to the rectangular opening, the forward assembly including a glass ultraviolet filter (38), the ultraviolet filter being in a rectangular configuration with a thickness of 0.250 inches, the forward assembly also including an outer transparent plate (40) fabricated of a heat resistant plastic, the outer transparent plate having a thickness of 0.035 inches, the forward assembly also including an inner fixed polarized filter lens (42) with etched parallel grating lines between about 10,000 and 20,000 lines per inch for varying the wavelength of light passing there through, the fixed polarized filter lens having a thickness of 0.035 inches; a rearward assembly (46) fixedly positioned within the major chamber adjacent to the visor housing, the rearward assembly including a rotatable polarized filter lens (48) with etched parallel grating lines between about 10,000 and 20,000 lines per inch for varying the wavelength of light passing there through, the rotatable polarized filter lens being generally circular in configuration with a periphery, the lens having a radial tab (50) with a radial slot (52), the rearward assembly including a retaining ring (54) attached to the periphery of the each clip having a cylindrical section slidably receiving a section of the retaining ring, a plurality of clips (56), each clip having a cylindrical section (58) slidably receiving a section of the retaining ring, each clip having an apertured section (60) with a fastener (62) to secure the ring and the rotatable polarized filter lens in the major chamber to overlie the minor chamber; an optical magnification lens (66) having a rectangular periphery, the optical magnification lens being fixedly positioned inwardly of the polarizing lens; and a drive assembly (70) adapted to rotate the rotatable polarized filter lens with respect to the fixed polarized filter lens, the drive assembly including an operator controlled lever (72) extending outwardly from the exterior surface of the face plate above the visor housing, a pivot pin (74) extending through the face plate with an interior end and with an exterior end attached to the lever, a link (76) formed with an aperture above attached to the interior end of the pivot pin, the link formed with a slot (78) below overlying the slot of the lens tab, a slide pin (80) extending through the slots of the link and the lens tab whereby rotation of the lever will rotate the rotatable polarized filter lens with respect to the fixed polarized filter lens to vary the etched parallel grating lines and thereby increase and decrease the light passing through the lenses. |
