초록 ▼

A filter canister for use with gas masks has telescoping top and bottom parts that are, in the assembled canister, sealed together. A filter for particulate material is molded in situ in the top part, while a separate adsorbent material cartridge is fitted into the bottom part. In manufacturing the

A filter canister for use with gas masks has telescoping top and bottom parts that are, in the assembled canister, sealed together. A filter for particulate material is molded in situ in the top part, while a separate adsorbent material cartridge is fitted into the bottom part. In manufacturing the canister, the cartridge is manufactured separately, apart from the remainder of the canister so that it can be kept in a controlled environment so as to avoid possible contaminating due to a humid atmosphere. The molding of the filter for particulate materials normally a pleated paper filter, in situ and away from the cartridge avoids the requirement for a long adhesive drying time during which the adsorbent material in the cartridge is exposed to humidity. The new canister also exhibits greater strength than the known canisters.

대표청구항 ▼

In a filter canister for use on a gas mask comprising a body with an inlet and an outlet, a filter for particulate material and an adsorbent material filter arranged in the body in sequence between the inlet and outlet, the improvement comprising: a body including a rigid, cup-shaped top part with t

In a filter canister for use on a gas mask comprising a body with an inlet and an outlet, a filter for particulate material and an adsorbent material filter arranged in the body in sequence between the inlet and outlet, the improvement comprising: a body including a rigid, cup-shaped top part with the inlet and a rigid, cup-shaped bottom part with the outlet, the two parts having respective cylindrical side walls engaged telescopically with one another and being sealed together with an adhesive sealant; a filter for particulate material sealed into the top part; and an absorbent filter comprising a separate cartridge with a bed of absorbent material housed in a rigid, cylindrical wall, the cartridge being fitted into the bottom part and sealed therein, whereby a double wall of rigid material is provided around the absorbent material bed.