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.

Pumps and dispensers having dosage control and various methods for actuating a pump or piston allow users to deliver a product from a container to be used by the user.

A system releases spray fluid in different mass flow rates. The system includes an actuator having a first area and a second area, a stem connected to the actuator and having a first orifice and a second orifice, a gasket covering the first orifice and the second orifice in a non-actuated position, and a biased member biasing the stem to the non-actuated position. When the first area of the actuator is pressed, the stem moves a first distance relative to the gasket to uncover the second orifice and compressing the biased member to spray fluid with a first mass flow rate. When the second area of the actuator is pressed, the stem moves a second distance relative to the gasket to uncover the first orifice and the second orifice to spray fluid with a second mass flow rate greater than the first mass flow rate.

A fluid dispenser for containing and dispensing metered amounts of fluid that includes a reservoir for containing fluid and a chamber positioned substantially within the reservoir for containing a quantity of the fluid. The fluid dispenser additionally includes a piston that is moveable within the chamber to draw fluid into the chamber when the piston is moved in a first direction with respect to the chamber, and to discharge fluid from the chamber when the piston is moved in a second direction opposite the first direction. Further, the fluid dispenser includes a user-manipulatable control coupled to the piston and rotatable about an axis to select one of at least two different metered quantities of fluid to be dispensed. The user-manipulatable control is further movable to move the piston relative to the chamber along the axis to selectively dispense the selected metered quantity of fluid.

A pump dispenser for metered removal of a liquid from a container includes a housing for placement on the container to form a metering chamber, a rising tube connected to the metering chamber, and a pump head movable relative to the housing along a longitudinal axis of the dispenser to carry out a pump stroke. The pump dispenser has a piston secured to the pump head that is movable in the metering chamber to convey the liquid, a dispenser opening is connected to the metering chamber through which metered liquid can leave the pump dispenser, a spring that resets the pump head relative to the housing, and a valve that defines a conveying direction of the liquid from the rising tube into the dispenser opening and that blocks a conveying process in the opposite direction. The spring has a plurality of rings connected by respective connecting webs.

A spray system has a pump with a double-action reciprocating plunger balanced to receive equal up-stroke and down-stroke assist from a pre-pressurized supply. The reciprocating plunger has identical working surface area on opposite first and second axial faces. A pumping system has a double-action reciprocating plunger with upward- and downward-facing spacers. The plunger travels axially within a proportioning cylinder with first inlet and outlet ports at a first axial end, and second inlet and outlet ports at an opposite second axial end. When the plunger is at its top-most position, the upward-facing plunger occludes the first inlet and outlet ports without blocking flow. When the plunger is at its bottom-most position, the downward-facing plunger occludes the second inlet and outlet ports without blocking flow.

A fluid dispenser for containing and dispensing metered amounts of fluid that includes a reservoir for containing fluid and a chamber positioned substantially within the reservoir for containing a quantity of the fluid. The fluid dispenser additionally includes a piston that is moveable within the chamber to draw fluid into the chamber when the piston is moved in a first direction with respect to the chamber, and to discharge fluid from the chamber when the piston is moved in a second direction opposite the first direction. Further, the fluid dispenser includes a user-manipulatable control coupled to the piston and rotatable about an axis to select one of at least two different metered quantities of fluid to be dispensed. The user-manipulatable control is further movable to move the piston relative to the chamber along the axis to selectively dispense the selected metered quantity of fluid.

A trigger pump dispenser comprises a body, an outlet nozzle, a pump chamber, a piston for defining a variable volume in the pump chamber, a trigger coupled with the piston by interconnection means, and biasing means for biasing the trigger to a retracted position. The trigger is movable to cause the piston to pump liquid into and out of the pump chamber for dispensing through the outlet nozzle. The piston is interchangeably associatable with the trigger and the pump chamber so that different length pistons are usable to determine different maximum fill volumes of the pump chamber.

The present application discloses liquid dispensers, refill units for liquid dispensers, liquid pumps, lost motion devices, and methods for installing a refill unit and lost motion device. In certain embodiments, a liquid dispenser of the present application comprises a container for holding a liquid, a pump housing connected to the container, a liquid or air chamber, and a piston movable in the liquid or air chamber. A connector is linked to the piston. The connector has a flexible portion for connecting to the piston and an attachment portion for attaching to an actuator of the dispenser. A restrictor is positioned between the flexible portion of the connector and the piston. Movement of the connector a first distance in a first direction results in lost motion between the actuator and the piston and continued movement of the connector a second distance in the first direction moves the piston with the actuator.

A stroke adjuster and an associated dispenser are provided. An example embodiment provides a dispenser configured to dispense a fluid or foam and comprising a housing and a stroke adjuster. The housing comprises at least one housing engagement surface and defines an adjuster receiving area. The adjuster receiving area is configured to receive the stroke adjuster in one of either a first orientation or a second orientation. When the stroke adjuster is oriented within the dispenser in the first orientation a first surface is oriented upward and, when the dispenser is activated, a lower pump engagement surface of the pump is engaged by the first surface of the stroke adjuster. When the stroke adjuster is oriented within the dispenser in the second position a second surface is oriented upward and, when the dispenser is activated, the lower pump engagement surface is engaged by the housing engagement surface.