Washable, modular pump

1. A washable pump dispenser comprising:

a dispensing tube including a plunger stem at one end of the dispensing tube;

a closure having a cylindrical body coaxially receiving the plunger stem so as to accommodate reciprocal motion of the dispensing tube;

a housing having an inlet valve member positioned proximate to an inlet end of the housing, said housing coupled to the closure;

a piston having a central aperture contained within the housing wherein, in response to force applied by the plunger stem, the piston is movable toward the inlet end so as to vary a sealed volume of a pump chamber defined by the housing, the inlet valve member, the piston, and the central aperture;

a insert having a tubular body with a web extending radially inward, said insert: detachably coupled to the piston or detachably held proximate to a terminal end of the piston;

an outlet valve member held between the central aperture of the piston and the web of the insert so that, when the insert is detached from the piston or the terminal end, the outlet valve member may be removed and cleaned;

a biasing member urging the piston away from the first end; and

wherein the closure includes a chaplet positioned above and partially within the cylindrical body, said chaplet attached to the housing and forming a stopper to restrict the upward movement of the piston by abutting a top edge of an outlet valve insert formed on the piston.

2. The dispenser of claim 1 wherein the dispensing tube has a substantially L-, J-, or C-shape.

3. The dispenser of claim 2 wherein a dispensing head disposed at an opposing end of the dispensing tube in comparison to the plunger stem comprises a detachable shroud coupled to a portion of the dispensing tube above the closure.

4. The dispenser of claim 3 wherein the portion of the dispensing tube includes a skeleton and the detachable shroud is coupled to the skeleton.

5. A washable pump dispenser comprising:

a dispensing tube including a plunger stem at one end of the dispensing tube;

a closure having a cylindrical body coaxially receiving the plunger stem so as to accommodate reciprocal motion of the dispensing tube;

a housing having an inlet valve member positioned proximate to an inlet end of the housing, said housing coupled to the closure;

a piston having a central aperture contained within the housing wherein, in response to force applied by the plunger stem, the piston is movable toward the inlet end so as to vary a sealed volume of a pump chamber defined by the housing, the inlet valve member, the piston, and the central aperture;

a insert having a tubular body with a web extending radially inward, said insert: detachably coupled to the piston or detachably held proximate to a terminal end of the piston;

an outlet valve member held between the central aperture of the piston and the web of the insert so that, when the insert is detached from the piston or the terminal end, the outlet valve member may be removed and cleaned;

a biasing member urging the piston away from the first end; and

wherein the piston comprises a disc-shaped body oriented orthogonally to an inner sidewall of the housing, said disc-shaped body having: (i) a central aperture in which the outlet valve member rests in a sealing relationship, (ii) a cylindrical wall encircling the central aperture on a top facing of the disc, and (iii) a peripheral flange extending above and/or below the disc-shaped body, said peripheral flange sealingly engaging the inner sidewall.

6. A washable pump dispenser comprising:

a dispensing tube including a plunger stem at one end of the dispensing tube;

a closure having a cylindrical body coaxially receiving the plunger stem so as to accommodate reciprocal motion of the dispensing tube;

a housing having an inlet valve member positioned proximate to an inlet end of the housing, said housing coupled to the closure;

a piston having a central aperture contained within the housing wherein, in response to force applied by the plunger stem, the piston is movable toward the inlet end so as to vary a sealed volume of a pump chamber defined by the housing, the inlet valve member, the piston, and the central aperture;

a insert having a tubular body with a web extending radially inward, said insert: detachably coupled to the piston or detachably held proximate to a terminal end of the piston;

an outlet valve member held between the central aperture of the piston and the web of the insert so that, when the insert is detached from the piston or the terminal end, the outlet valve member may be removed and cleaned;

a biasing member urging the piston away from the first end; and

wherein the insert is detachably coupled to a cylindrical wall defining a portion of the plunger stem and wherein the piston includes a plurality of outlet valve restraining members positioned around the central aperture.

7. The dispenser of claim 1 wherein piston includes an outlet valve insert with a top portion having a larger diameter in comparison to a bottom portion.

8. The dispenser of claim 1 wherein the dispensing tube is formed from a single unitary tubular member defining an uninterrupted internal flow path from the plunger stem to an outlet formed at a second end of the dispensing tube.

9. The dispenser of claim 1 wherein the biasing member is confined within the pump chamber.

10. The dispenser of claim 1 wherein the insert is detachably held to the terminal end.

11. The dispenser of claim 1 wherein the inlet end includes a plurality of inlet valve restraining members positioned around an inlet aperture formed at the inlet end.

12. The dispenser of claim 1 wherein, when the housing is detached from the closure, the piston, the outlet valve member, the biasing member, the inlet valve member, and the dispensing tube may be individually separated and cleaned.

13. The dispenser of claim 1 wherein the web extends inward a sufficient distance to restrain movement of the outlet valve member as the dispenser is actuated.

14. The dispenser of claim 5 wherein the dispensing tube is formed from a single unitary tubular member defining an uninterrupted internal flow path from the plunger stem to an outlet formed at a second end of the dispensing tube.

15. The dispenser of claim 5 wherein the biasing member is confined within the pump chamber.

16. The dispenser of claim 5 wherein, when the housing is detached from the closure, the piston, the outlet valve member, the biasing member, the inlet valve member, and the dispensing tube may be individually separated and cleaned.

17. The dispenser of claim 5 wherein the dispensing tube has a substantially L-, J-, or C-shape.

18. The dispenser of claim 5 wherein the insert is detachably held to the terminal end.