# US 8,783,517 B2 · Foam dispenser nozzle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,783,517 B2 - Document ID: US8783517B2 - Status: Granted - Kind: B2 - Application number: 13/042,480 - Filed: 2011-03-08 - Published: 2011-06-30 - Granted: 2014-07-22 - Earliest claimed: 2004-03-29 - Assignees: P G United States Israel Ltd. - Applicants: Moshe Malik; Shalom Levin; Shlomo Nevo - Inventors: Moshe Malik; Shalom Levin; Shlomo Nevo - Web page: https://patentgrep.com/patent/US8783517B2 ## CPC - B01F 25/23: Mixing by intersecting jets - B01F 33/5011: {portable during use, e.g. hand-held} - B01F 33/50112: {of the syringe or cartridge type} - B01F 33/50114: {of the hand-held gun type} - B01F 35/513: Flexible receptacles, e.g. bags supported by rigid containers - B01F 35/522: {comprising compartments keeping the materials to be mixed separated until the mixing is initiated (containers or packages for packaging two or more different materials which must be maintained separate prior to use in admixture B65D81/32)} - B01F 35/714: {for feeding predetermined amounts (B01F35/88 takes precedence)} - B01F 35/7164: {the containers being placed in parallel before contacting the contents} - B01F 35/7174: {using pistons, plungers or syringes} - B01F 35/717611: {Peristaltic pumps} - B01F 35/831: {using one or more pump or other dispensing mechanisms for feeding the flows in predetermined proportion, e.g. one of the pumps being driven by one of the flows (B01F35/832 takes precedence)} - B29B 7/7447: {including means for feeding the components} - B29B 7/7452: {for mixing components by spraying them into each other; for mixing by intersecting sheets} - B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06) - B29B: PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS ## Abstract A chemical mixing device. The device includes a flow generator operative to provide at least two streams of chemicals and a mixing chamber, including at least two inlets adapted to receive the at least two streams of chemicals and an outlet through which a mixture of the streams of chemicals is ejected from the mixing device. The mixing chamber has an open state in which the chemicals are mixed and a closed state in which the volume of the mixing chamber is less than a fifth of the open state volume. ## Claims ### Claim 1 A foam dispensing device, comprising: two input tubes, each input tube receiving a different chemical; a mixing chamber having at least one elastic wall; and a flow generator adapted to induce flow of the chemicals received from the input tubes into the mixing chamber, wherein the mixing chamber has a first substantially zero volume corresponding to a closed state, and a second larger volume corresponding to an open state in which the flow of chemicals is mixed when the flow generator induces the flow of chemicals into the mixing chamber, and wherein the mixing chamber remains in the closed state in absence of the flow of chemicals. ### Claim 2 (depends on 1) The foam dispensing device of claim 1 wherein the mixing chamber includes two inlets, each inlet receiving a different one of the flow of chemicals and an outlet through which a mixture of the flow of chemicals is ejected from the foam dispensing device. ### Claim 3 (depends on 2) The foam dispensing device of claim 2, wherein the at least one elastic wall of the mixing chamber is biased in the closed state. ### Claim 4 (depends on 3) The foam dispensing device of claim 3, wherein the at least one elastic wall of the mixing chamber is biased in the closed state by a pressure greater than required to keep the mixing chamber in the closed state. ### Claim 5 (depends on 2) The foam dispensing device of claim 2, wherein the mixing chamber has a volume smaller than a cubic millimeter in the closed state. ### Claim 6 (depends on 2) The foam dispensing device of claim 2, wherein the mixing chamber has a volume of less than 20 cubic millimeters in the open state. ### Claim 7 (depends on 2) The foam dispensing device of claim 2, wherein the mixing chamber is made of a flexible material. ### Claim 8 (depends on 7) The foam dispensing device of claim 7, wherein the mixing chamber is made of a compressible material. ### Claim 9 (depends on 7) The foam dispensing device of claim 7, wherein the mixing chamber material has a hardness of less than 60 shore A. ### Claim 10 (depends on 7) The foam dispensing device of claim 7, further comprising a pressure unit which controllably applies a closing pressure on the mixing chamber when the mixing chamber is in the closed state, but does not apply the closing pressure when the mixing chamber is in the open state. ### Claim 11 (depends on 2) The foam dispensing device of claim 2, wherein the flow generator and the mixing chamber are connected to each other and are adapted to be replaced together. ### Claim 12 (depends on 2) The foam dispensing device of claim 2, wherein the mixing chamber is part of a nozzle of the foam dispensing device, and the nozzle outputs the mixed flow of chemicals. ### Claim 13 (depends on 12) The foam dispensing device of claim 12, wherein the nozzle further comprises at least two channels leading the flow of chemicals to the mixing chamber, wherein the at least two channels have a cross-section decreasing in direction of the mixing chamber. ### Claim 14 (depends on 13) The foam dispensing device of claim 13, wherein one or more of the at least two channels have a cross-section which decreases by at least a factor of 2, from the flow generator to the mixing chamber. ### Claim 15 (depends on 13) The foam dispensing device of claim 13, wherein one of the at least two channels has a cross-section of less than 3 square millimeters in the proximity of the mixing chamber. ### Claim 16 (depends on 13) The foam dispensing device of claim 13, wherein at least a portion of the at least two channels is held in a closed state when the flow generator does not operate. ### Claim 17 (depends on 1) The foam dispensing device of claim 1, wherein the mixing chamber is not longer than 15 millimeters. ### Claim 18 (depends on 12) The foam dispensing device of claim 12, wherein the flow generator provides the flow of chemicals at a sufficient pressure to force the mixing chamber into the open state. ### Claim 19 (depends on 18) The foam dispensing device of claim 18, further comprising a pressure valve between the flow generator and the nozzle to prevent the flow of chemicals from reaching the nozzle until the flow of chemicals reaches a pressure above 3 bar. ### Claim 20 (depends on 1) The foam dispensing device of claim 1, wherein the mixing chamber is made of a material which does not stick to polyurethane foam. ### Claim 21 (depends on 1) The foam dispensing device of claim 1, wherein the mixing chamber has an average cross section area of less than 10 square millimeters. ### Claim 22 (depends on 1) The foam dispensing device of claim 1, wherein the mixing chamber is configured to push out any remnant chemicals therein when the flow of chemicals is stopped. ### Claim 23 (depends on 1) The foam dispensing device of claim 1, wherein the flow generator comprises a pump. ### Claim 24 (depends on 23) The foam dispensing device of claim 23, wherein the pump comprises a gear pump. ### Claim 25 (depends on 1) The foam dispensing device of claim 1, further comprising an elastic ring which continuously applies a closing force to the mixing chamber.