# US 11,027,300 B2 · Fluid dispensing apparatus and method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,027,300 B2 - Document ID: US11027300B2 - Status: Granted - Kind: B2 - Application number: 16/799,140 - Filed: 2020-02-24 - Published: 2020-06-18 - Granted: 2021-06-08 - Earliest claimed: 2007-06-08 - Assignees: Diversey, Inc. - Applicants: Diversey, Inc. - Inventors: Garry W. Crossdale; Andrew Swain; Martin Cooper; Michael H. Bertucci; Barry Hague; Guy Thornhill - Web page: https://patentgrep.com/patent/US11027300B2 ## CPC - B05B 11/1007: {by adjusting or modifying the pump end-of-sucking-stroke position} - B05B 11/0056: {with an additional opening for filling or refilling} - B05B 11/0089: {Dispensing tubes} - B05B 11/0097: {Means for filling or refilling the sprayer (through additional openings in the container B05B11/0056)} - B05B 11/1005: {with means for adjusting or modifying pump stroke} - B05B 11/1015: {actuated without substantial movement of the nozzle in the direction of the pressure stroke (B05B11/1011 takes precedence)} - B05B 11/1052: {Actuation means (locking means therefor B05B11/1059; the dispensing stroke being affected by the stored energy of a spring B05B11/109)} - B05B 11/1059: {Means for locking a pump or its actuation means in a fixed position (B05B11/1091 takes precedence)} - B05B 11/106: {in a retracted position, e.g. in an end-of-dispensing-stroke position} - B67B 7/24: {Hole-piercing devices} - B67D 7/0227: {by an ejection plunger (B67D7/0238 takes precedence)} - G01F 11/028: {the dosing device being provided with a dip tube and fitted to a container, e.g. to a bottleneck} - B05B: SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES (spray-mixers with nozzles B01F25/72; processes for applying liquids or other fluent materials to surfaces by spraying B05D) - B67B: APPLYING CLOSURE MEMBERS TO BOTTLES JARS, OR SIMILAR CONTAINERS; OPENING CLOSED CONTAINERS (opening or closing devices attached to, or incorporated in, containers or container closures B65D) - B67D: DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR (cleaning pipes or tubes or systems of pipes or tubes B08B9/02; emptying or filling of bottles, jars, cans, casks, barrels, or similar containers, not otherwise provided for B67C; water supply E03; pipe systems F17D; domestic hot-water supply systems F24D; measuring volume, volume flow, mass flow or liquid level, metering by volume G01F; coin-freed or like apparatus G07F) - G01F: MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME ## Abstract A fluid dispenser including a body, a chamber coupled to or formed as part of the body and configured to contain a quantity of fluid, and a piston coupled to the body and rotatable within the chamber to different position. The piston is movable relative to the chamber in a first direction along an axis to draw fluid into the chamber, and the piston is movable relative to the chamber in a second direction opposite the first direction to discharge fluid from the chamber. The piston has stroke lengths that are selectable via the different rotational positions of the piston and that are associated with metered quantities of fluid to be drawn into the chamber. An anti-reversal feature is disposed between the piston and the body. The anti-reversal feature inhibits reversal of the piston during movement of the piston in the first direction or the second direction. ## Claims ### Claim 1 A fluid dispenser comprising: a body; a chamber coupled to or formed as part of the body and configured to contain a quantity of fluid; a piston coupled to the body and rotatable within the chamber to different positions, the piston movable relative to the chamber in a first direction along an axis to draw fluid into the chamber, and the piston movable relative to the chamber in a second direction opposite the first direction to discharge fluid from the chamber, the piston having stroke lengths selectable via the different rotational positions of the piston and associated with metered quantities of fluid to be drawn into the chamber; and an anti-reversal feature disposed between the piston and the body, the anti-reversal feature configured to inhibit reversal of the piston during movement of the piston in the first direction or the second direction. ### Claim 2 (depends on 1) The fluid dispenser of claim 1, wherein the anti-reversal feature is defined by a ratchet mechanism including teeth disposed on the piston, and wherein the teeth are engageable by a portion of the body to inhibit reversal of the piston as the piston moves in the first direction or the second direction. ### Claim 3 (depends on 2) The fluid dispenser of claim 2, wherein the portion of the body includes a pawl extending toward the piston and engageable with the teeth to inhibit reversal of the piston during movement of the piston. ### Claim 4 (depends on 3) The fluid dispenser of claim 3, wherein the pawl is pivotally coupled to the body. ### Claim 5 (depends on 3) The fluid dispenser of claim 3, wherein the pawl is resiliently deformable by movement of the piston. ### Claim 6 (depends on 3) The fluid dispenser of claim 3, further comprising a support positioned on the body to bias the pawl to a neutral position to permit reversal of the piston on movement of the piston the entirety of the selected stroke length. ### Claim 7 (depends on 3) The fluid dispenser of claim 3, wherein the piston has a toothless portion to permit reversal of the piston. ### Claim 8 (depends on 1) The fluid dispenser of claim 1, wherein the anti-reversal feature is engageable with the piston in each of the first direction and the second direction to inhibit reversal of the piston. ### Claim 9 (depends on 1) The fluid dispenser of claim 1, wherein the stroke lengths include a first stroke length and a second stroke length different from the first stroke length such that the piston is movable different distances in the first direction. ### Claim 10 (depends on 1) The fluid dispenser of claim 1, wherein the piston is configured to rotate to each of the rotational positions without axial movement in the first direction or the second direction. ### Claim 11 (depends on 1) The fluid dispenser of claim 1, wherein the piston is removable and replaceable relative to the body. ### Claim 12 (depends on 1) The fluid dispenser of claim 1, wherein at least a portion of the piston is changeable to provide a stroke length associated with another metered quantity of fluid to be drawn into the chamber. ### Claim 13 A fluid dispenser comprising: a body; a chamber coupled to or formed as part of the body and configured to contain a quantity of the fluid; a piston coupled to the body and rotatable within the chamber to different positions, the piston movable relative to the chamber in a first direction along an axis to draw fluid into the chamber, and the piston movable relative to the chamber in a second direction opposite the first direction to discharge fluid from the chamber, the piston having different stroke lengths selectable via the different rotational positions of the piston and associated with different metered quantities of fluid to be drawn into the chamber; and a mechanism disposed between the piston and the body and configured to control movement of the piston relative to the chamber, the mechanism having an anti-reversal state inhibiting reversal of the piston during movement of the piston in the first direction or the second direction along the selected stroke length, the mechanism further having a neutral state permitting reversal of the piston. ### Claim 14 (depends on 13) The fluid dispenser of claim 13, wherein the mechanism is defined by a ratchet mechanism including teeth disposed on the piston, and wherein the teeth are engageable by a pawl in the anti-reversal state to prevent reversal of the piston during movement of the piston. ### Claim 15 (depends on 14) The fluid dispenser of claim 14, further comprising a support positioned on the body, wherein the piston has a toothless portion, and wherein the support and the toothless portion adjust the ratchet mechanism to the neutral state. ### Claim 16 (depends on 13) The fluid dispenser of claim 13, wherein the mechanism is in the neutral state on movement of the piston the entirety of the selected stroke length. ### Claim 17 (depends on 16) The fluid dispenser of claim 16, wherein the piston is configured to rotate to each of the rotational positions without axial movement in the first direction or the second direction. ### Claim 18 A method of dispensing a metered quantity of fluid from a fluid dispenser, the fluid dispenser including a body, a chamber, and a piston, the method comprising: rotating the piston within the chamber to select a first rotational position of the piston from a plurality of rotational positions associated with different stroke lengths of the piston associated with different metered quantities of fluid to be drawn into the chamber, the piston movable in a first direction and a second direction along an axis in at least two of the plurality of rotational positions, and the first rotational position associated with a first stroke length to dispense a first metered quantity of fluid; inhibiting reversal of the piston via an anti-reversal feature positioned between the piston and the body during movement of the piston along the first stroke length; and permitting reversal of the piston for movement of the piston in the second direction via the anti-reversal feature on movement of the piston the entirety of the first stroke length. ### Claim 19 (depends on 18) The method of claim 18, further comprising inhibiting reversal of the piston via the anti-reversal feature during movement of the piston in the second direction along the first stroke length. ### Claim 20 (depends on 18) The method of claim 18, further comprising rotating the piston within the chamber to select a second rotational position of the piston from the plurality of rotational positions, the second rotational position associated with a second stroke length different from the first stroke length; inhibiting reversal of the piston via the anti-reversal feature during movement of the piston along the second stroke length; and permitting reversal of the piston for movement of the piston in the second direction via the anti-reversal feature on movement of the piston the entirety of the second stroke length.