US 12,440,072 B2
Sequentially activated multi-diaphragm foam pumps, refill units and dispenser systems
Donald R. Harris, Mogadore, OH (US); John J. McNulty, Broadview Heights, OH (US); Aaron D. Marshall, Uniontown, OH (US); Daniel M. Willis, Clinton, OH (US); and Nick E. Ciavarella, Seven Hills, OH (US)
Assigned to GOJO Industries, Inc., Akron, OH (US)
Filed by GOJO Industries, Inc., Akron, OH (US)
Filed on Feb. 15, 2023, as Appl. No. 18/169,309.
Application 18/169,309 is a continuation of application No. 17/159,441, filed on Jan. 27, 2021, granted, now 11,596,273.
Application 17/159,441 is a continuation of application No. 16/008,183, filed on Jun. 14, 2018, granted, now 10,912,426, issued on Feb. 9, 2021.
Application 16/008,183 is a continuation in part of application No. 15/480,711, filed on Apr. 6, 2017, granted, now 10,143,339, issued on Dec. 4, 2018.
Application 15/480,711 is a continuation in part of application No. 15/429,389, filed on Feb. 10, 2017, granted, now 10,441,115, issued on Oct. 15, 2019.
Application 15/480,711 is a continuation in part of application No. 15/369,007, filed on Dec. 5, 2016, granted, now 10,080,468, issued on Sep. 25, 2018.
Application 15/480,711 is a continuation in part of application No. 15/356,795, filed on Nov. 21, 2016, granted, now 10,080,467, issued on Sep. 25, 2018.
Application 15/480,711 is a continuation in part of application No. 15/355,112, filed on Nov. 18, 2016, granted, now 10,080,466, issued on Sep. 25, 2018.
Application 15/480,711 is a continuation in part of application No. 15/350,190, filed on Nov. 14, 2016, granted, now 10,065,199, issued on Sep. 4, 2018.
Claims priority of provisional application 62/319,061, filed on Apr. 6, 2016.
Prior Publication US 2023/0190049 A1, Jun. 22, 2023
Int. Cl. A47K 5/14 (2006.01); A47K 5/12 (2006.01); A47K 5/16 (2006.01); F04B 13/02 (2006.01); F04B 19/06 (2006.01); F04B 23/02 (2006.01); F04B 23/06 (2006.01); F04B 43/02 (2006.01); F04B 43/04 (2006.01); F04B 45/04 (2006.01); F04B 45/047 (2006.01); F04B 49/06 (2006.01)
CPC A47K 5/14 (2013.01) [A47K 5/1208 (2013.01); A47K 5/1211 (2013.01); A47K 5/1217 (2013.01); A47K 5/16 (2013.01); F04B 13/02 (2013.01); F04B 19/06 (2013.01); F04B 23/02 (2013.01); F04B 23/06 (2013.01); F04B 43/02 (2013.01); F04B 43/025 (2013.01); F04B 43/026 (2013.01); F04B 43/04 (2013.01); F04B 45/04 (2013.01); F04B 45/043 (2013.01); F04B 45/047 (2013.01); F04B 49/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A foam dispenser comprising:
a housing;
a container for holding fluid;
a drive motor;
a foam pump coupled to the drive motor;
the foam pump having
a liquid pump diaphragm having a liquid pump stem; and
two or more air pump chambers each having an air pump stem;
wherein the length of the liquid pump stem is a different length than each of the air pump stems;
the liquid pump diaphragm has a liquid pump chamber depth; and
the one or more air pump diaphragms have an air pump chamber depth;
wherein the air pump chamber depth is greater than the liquid pump chamber depth;
and
one or more outlet valves;
a mixing chamber downstream of the one or more outlet valves for mixing foamable liquid from the liquid pump chamber with air from each of the two or more air pump chambers;
an outlet for dispensing foam wherein the outlet is in fluid communication with mixing chamber; and
an actuator for sequentially actuating the liquid pump diaphragm and the two or more air pump diaphragms to dispense foam.