Charcoal filter arrangement

Claim 1

A carbon filter for removing gaseous contaminants comprising: a flow-through housing having inlet and outlet connections in flow communication with the interior thereof; a filter assembly, located within said flow-through housing having a plurality of geometrically shaped flow-through axially extending exit chambers and a plurality of geometrically shaped flow-through axially extending entrance chambers, said entrance chambers being in flow communication with said inlet connection and said exit chambers being in flow communication with said outlet connection, said filter assembly being cylindrical and comprises said plurality of flow-through axially extending exit and entrance chambers positioned equidistant from each other in alternating fashion such that each flow-through entrance chamber is adjacent at least two flow-through exit chambers and each flow exit chamber is adjacent at least two flow-through entrance chambers, said cylindrical filter assembly located within said cylindrical housing additionally comprises a peripheral skirt extending from one end thereof which is sealingly attached to one end of said housing, circumscribing said inlet connection of said housing, to form an inlet plenum in flow communication with said connection and the entrance chamber of said filter assembly; granulated activated charcoal disposed within the space between said entrance chambers and said exit chambers to form a loosely packed granular charcoal filter bed of uniform flow-through thickness; and forced-feed charcoal reservoir means extending through the walls of said housing to allow access to said reservoir from outside said housing, said reservoir means containing flowable particulate activated charcoal in flow communication with said charcoal filter bed to keep said bed continuously filled, said forced feed charcoal reservoir means comprises an elongated cylindrical container filled with flowable particulate activated charcoal in flow communication with the filter bed of said filter assembly, said cylindrical container having a removable screw cap, flat solid plate means concentrically positioned therein contactijng said flowable particulate activated charcoal, and spring means abutting said screw cap and biasing said solid plate means against said charcoal in said reservoir to keep constant pressure on said charcoal filter bed of the filter assembly.