| 摘要 |
2065300 9103279 PCTABS00003 The present invention relates to a safety helmet (11) capable of being used with or without a breathing apparatus. In one embodiment a "total" safety helmet (11) with a see-through aperture (12) includes quick-release devices arranged to selectively clamp one or the other of two rigid closed frame assemblies (27) within the helmet (11). Each of assemblies (27) includes a flexible annular seal (26) having one circumferential end secured to the frame (27) and the other end intended to contact the wearer's face. When one of said assemblies (27) is clamped in the helmet (11) the volume forward of the wearer's face is exposed to atmosphere through the open see-through aperture (12). When the other of said assemblies (27) is clamped in the helmet (11) a see-through panel (24) closes the aperture (12) through the helmet (11) and valves and air ducts, supported by said frame (27), supply breathable air to the volume defined within the annular seal (26).
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