Patent ID: 7735685

Claim:
A chemical feed system for a foam dispenser, comprising: a motor; a pump unit; a drive transmission system in line between said motor and pump unit, said drive transmission system comprising a magnetic coupling assembly having a first magnetic coupling member and a second magnetic coupling member and an intermediate shroud positioned between said first and second magnetic coupling members and sealing fluid within said pump unit wherein said shroud has a chemical reception cavity; and an isocyanate feed inlet port that feeds isocyanate to the chemical reception cavity, wherein said shroud has a side wall and an upper cover which together define a sealed chemical reception cavity in which one of said first and second magnetic coupling members is received, and wherein a reactant foam precursor chemical flows between an interior surface of said shroud and the magnetic coupling member which is positioned in the chemical reception cavity formed within said shroud and is coupled to said pump unit, and the other magnetic coupling member is driven by said motor and drives said second magnetic coupling member, wherein said drive transmission system includes a drive transmission shaft, and said pump unit includes an inlet pump manifold and an outlet pump manifold with said shroud fastened to said outlet pump manifold, and said outlet pump manifold includes a manifold reception cavity within which said drive transmission shaft axially extends, and said drive transmission shaft is supported by a first bearing device also received within the manifold reception cavity of said output pump manifold, and wherein said inlet pump manifold and outlet pump manifold are in a vertically stacked arrangement with said inlet manifold having a filter extending across a lower region of said inlet manifold such that an extension of a central axis of elongation of said drive shaft away from a free end of said drive shaft intercepts a filtering surface of said filter.