US 12,186,771 B2
Foam pump utilizing a compression spring assembly
Stephan Thiede, Waalwijk (DE); and Marc Tepas, Alkmaar (NL)
Assigned to SILGAN DISPENSING SYSTEMS CORPORATION
Filed by SILGAN DISPENSING SYSTEMS CORPORATION, Grandview, MO (US)
Filed on Jan. 24, 2023, as Appl. No. 18/100,856.
Prior Publication US 2024/0246097 A1, Jul. 25, 2024
Int. Cl. B05B 7/00 (2006.01); A47K 5/14 (2006.01); B05B 11/10 (2023.01)
CPC B05B 7/0062 (2013.01) [A47K 5/14 (2013.01); B05B 11/1014 (2023.01); B05B 11/105 (2023.01); B05B 11/1087 (2023.01)] 18 Claims
OG exemplary drawing
 
1. A foam dispenser, comprising:
an accumulator, comprising:
a liquid chamber;
an air chamber; and
an accumulator spring cone;
an air piston, comprising:
an air piston wall;
an air piston seal seated against an interior wall of the air chamber;
at least one air inlet through the air piston wall;
a restrictor seat;
an air valve seat;
an air piston constriction; and
a head connection extending from the air piston constriction away from the air chamber;
a piston rod, comprising:
a fluid intake end positioned in a portion of the liquid chamber;
a fluid opening in the fluid intake end;
a fluid output end opposite the fluid intake end, comprising:
a piston rod spring cone;
a flange extending outward of the piston rod spring cone and sealed against an interior wall of the air piston; and
at least one air passage through the flange;
a fluid flow path on an interior of the piston rod between the fluid intake end and the fluid output end;
a liquid piston attached to the fluid intake end of the piston rod and seated in the liquid chamber, comprising:
an exterior chevron;
a central seal flange extending off an internal surface of the exterior chevron;
an upper chevron extending off of the central seal; and
a lower chevron extending off the central seal in a direction opposite the upper chevron;
a spring seated between the piston rod spring cone and the accumulator spring cone;
a restrictor seated in the restrictor seat and connected to the piston rod, comprising:
at least one restrictor liquid inlet in communication with the fluid flow path; and
at least one restrictor liquid outlet in communication with the at least one restrictor liquid inlets;
an air valve seated in the air valve seat, comprising:
a wall;
an air inlet flange extending off an exterior surface of the wall; and
an air outlet flange extending off an interior surface of the wall;
a dispenser head connected to the head connection; and
a mesh holder seated in the dispenser head.