Abstract: Described is a protective mask for civil or military use including a supporting frame comprising two identical lateral seats, positioned in a lower portion of the supporting frame and mirroring each other relative to a sagittal plane of the supporting frame, and a front seat located in an upper portion of the supporting frame, a protective lens anchored to the supporting frame to cover the front seat and an inhaling opening and an exhaling opening which are interchangeable housed or which can be can be housed in the lateral seats.

Abstract: A gas mask is provided which includes a facepiece including a front portion of semi-rigid rubber highly resistant to chemical agents and a sealing skirting of soft rubber having a high mechanical resistance, co-vulcanized with the front portion of the facepiece. A nozzle, connected to a half mask situated inside the facepiece, is tightly fastened to the front portion of the facepiece. An inflow opening and an outflow opening are provided which are substantially coaxial and are located in the lower portion of the nozzle. The inflow opening places the interior of the facepiece into communication with the external atmosphere and the outflow opening places the interior of the half mask into communication with the external atmosphere through an inflow chamber and an outflow chamber which are separated by a partition. The inflow chamber communicates bilaterally with a space located between the half mask and the facepiece.

Abstract: A device is provided for preventing the inflow of air into a gas mask during the substitution of its filter in the presence of a contaminated atmosphere. The device includes a small plate having a central stem which passes through the support for a check valve admitting air to the respiratory tract of the user and a spring which pushes the small plate against the diaphragm of the check valve when the filter is removed from the mask to prevent inflow of air into the mask.

Abstract: A protective garment in the form of a suit comprising gloves, boots, hood and facial mask. The suit is provided on its back region with a vertically extending slit which can be tightly closed by a zipper. Inside the garment, two protective skirts are respectively fastened along opposite portions of the slit; these are mutually connected by auxiliary protective portions situated at the opposite ends of the slit. The protective skirts are provided with respective gripping handles adapted to bring them, together with the auxiliary portions, from a rest position in which they are enclosed within the garment, to an operative position in which they are reversed astride the corresponding edges of the slit.

Abstract: A commutator feeding device for a demand valve, comprising a transducer adapted for controlling the movement of a shutter element for feeding predetermined quantities of air into a chamber of said demand valve in response to a pressure variation taking place inside said chamber, said transducer being activated following the shifting of a deformable membrane. The device comprises a spring, disposed inside a small piston, adapted for resting on said membrane, said small piston being provided with radial stakes or spokes, each one of which is adapted to rest on the active surface of a corresponding helicoidal profile cam, with manually operable actuating means being predisposed for controlling the rotation of said small piston around its own axis, and hence the axial shifting of the small piston itself in the spring-compressing sense.