초록 ▼

Breathing equipment, e.g., a half mask-type respirator, is disclosed. A mask is provided with three ports of common dimension in any one of which inhalation or exhalation fittings housing inhalation or exhilation valves may be mounted. Disclosed are chemical and mechanical filtration cartridges usab

Breathing equipment, e.g., a half mask-type respirator, is disclosed. A mask is provided with three ports of common dimension in any one of which inhalation or exhalation fittings housing inhalation or exhilation valves may be mounted. Disclosed are chemical and mechanical filtration cartridges usable alternatively or in combination. Disposable chemical filtration cartridges having novel lock and seal structure are disclosed. Bayonet-type couplings for coupling the filter housings to the inhalation respiratory fittings and an audible device to indicate that the filter housings are properly coupled are disclosed. The respirator valve is a thin umbrella-shaped disk valve having a multiplicity of radiating ribs which biases the valve to the closed position. A novel crown strap suspension is also provided.

대표청구항 ▼

A respirator comprising a face mask configured to concurrently enclose both the mouth and the nasal passages of a user of the respirator, the face mask having a surface effecting a seal with the user\s face around a perimeter bounding the mouth and nostrils of the user and a wall portion extending f

A respirator comprising a face mask configured to concurrently enclose both the mouth and the nasal passages of a user of the respirator, the face mask having a surface effecting a seal with the user\s face around a perimeter bounding the mouth and nostrils of the user and a wall portion extending from said surface and defining a chamber providing intercommunication between the user\s mouth and nasal passages, the chamber wall portion having three respiration ports extending therethrough, one of which is located in a central region of the chamber adjacent to the user\s nasal passages and the other two of which are respectively offset toward opposite sides of said central region, respirator fittings configured to interfit with each said respiration port, at least one of said fittings having a valve providing for exhalation and restraining inhalation and at least one of said fittings providing freedom for inhalation, all of said ports and fittings having common dimensions providing for alternative positioning of inhalation and exhalation fittings either in the respiration port located in the central region of the chamber or in a port offset toward a side of said central region.