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A pump for dispensing a fluid product from a product container, includes a unitary pump body defining an axis and including a pump chamber, a pump inlet and a pump outlet. The pump chamber is collapsible over an axially directed pumping stroke from an initial condition to a collapsed condition and i

A pump for dispensing a fluid product from a product container, includes a unitary pump body defining an axis and including a pump chamber, a pump inlet and a pump outlet. The pump chamber is collapsible over an axially directed pumping stroke from an initial condition to a collapsed condition and is biased to return to its initial condition in a return stroke. An axially compressible spring is arranged to at least partially support the pump body during its collapse.

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1. A pump for dispensing a fluid product from a product container, the pump comprising: a unitary pump body defining an axis A and comprising a pump chamber, a pump inlet and a pump outlet, the pump chamber being collapsible over an axially directed pumping stroke from an initial condition to a coll

1. A pump for dispensing a fluid product from a product container, the pump comprising: a unitary pump body defining an axis A and comprising a pump chamber, a pump inlet and a pump outlet, the pump chamber being collapsible over an axially directed pumping stroke from an initial condition to a collapsed condition and being biased to return to its initial condition in a return stroke;an inlet valve for allowing one way passage of fluid through the pump inlet and into the pump chamber;an outlet valve for allowing one way passage of fluid from the pump chamber through the pump outlet; andan axially compressible spring located inside the pump chamber and arranged to at least partially support the pump body during its collapse, the spring comprising a first end portion that engages within the pump inlet, a second end portion that engages within the pump outlet and a spring body therebetween, the spring body comprising a plurality of axially-aligned, leaf-spring sections, each of which can be compressed in the axial direction from an initial open condition to a compressed condition and is biased to subsequently expand to its open condition, whereby axial compression of the spring generates a restoring force, at least partially biasing the pump chamber to its initial condition. 2. The pump according to claim 1, wherein the spring, the pump body, or both comprises plastomer material. 3. The pump according to claim 1, wherein the spring at least partially supports against an internal surface of the pump chamber during its collapse. 4. The pump according to claim 1, wherein the inlet valve comprises a first valve element, integrally formed with the first end portion of the spring. 5. The pump according to claim 1, wherein the outlet valve comprises a second valve element, integrally formed with the second end portion of the spring. 6. The pump according to claim 1, wherein the pump inlet has an inner diameter greater than that of the pump outlet and the spring tapers from the first end portion to the second end portion. 7. The pump according to claim 1, wherein the pump body, the spring, or both comprises an ethylene alpha olefin copolymer. 8. The pump according to claim 1, wherein the pump body, the spring, or both comprises a material having a flexural modulus according to ASTM D-790 in the range of 15-80 MPa. 9. The pump according to claim 1, wherein the pump body, the spring, or both comprises a material having an ultimate tensile strength according to ASTM D-638 in the range of 3-11 MPa. 10. The pump according to claim 1, wherein the pump body, the spring, or both comprises a material having a melt flow index according to ISO standard 1133-1 of at least 10 dg/min. 11. The pump according to claim 1, wherein the pump chamber comprises a cylindrical wall that is relatively more flexible than the pump inlet and pump outlet. 12. The pump according to claim 11, wherein the cylindrical wall is arranged such that its collapse generates a restoring force tending to bias the pump chamber to the initial condition. 13. The pump according to claim 12, wherein the pump outlet has a diameter that is different from a diameter of the cylindrical wall and the cylindrical wall can collapse by inverting whereby the pump outlet is at least partially received within the pump chamber or vice-versa. 14. The pump according to claim 1, wherein the pump outlet defines a nozzle, integrally formed with a frangible closure element. 15. The pump according to claim 1, wherein the spring alone biases the pump chamber to return to its initial condition. 16. The pump according to claim 1, wherein the pump chamber and the spring together bias the pump chamber to return to its initial condition, whereby the spring provides a major biasing force at least during an initial part of the return stroke. 17. The pump according to claim 1, wherein the pump chamber and the spring together bias the pump chamber to return to its initial condition, whereby the pump chamber provides a greater biasing force over a final part of the return stroke than over an initial part of the return stroke. 18. The pump according to claim 1, wherein the pump body and the spring are injection molded of the same material. 19. The pump according to claim 1, wherein the pump body and the spring are injection molded of different materials. 20. The pump according to claim 1, consisting of only two components, namely the pump body and the spring, whereby the pump body and the spring comprise portions that interact to define a one-way inlet valve and a one-way outlet valve. 21. A pump assembly comprising: the pump according to claim 1; anda pair of sleeves, arranged to slidably interact to guide the pump during a pumping stroke, including a stationary sleeve engaged with the pump inlet and a sliding sleeve engaged with the pump outlet. 22. The pump assembly according to claim 21, wherein the stationary sleeve and sliding sleeve have mutually interacting detent surfaces that prevent their separation and define the pumping stroke. 23. The pump assembly according to claim 21, wherein the stationary sleeve comprises a socket having an axially extending male portion and the pump inlet has an outer diameter, dimensioned to engage within the socket and comprises a boot portion, rolled over on itself to receive the male portion. 24. A disposable fluid dispensing package, comprising: the pump according to claim 1 sealingly connected to a collapsible product container. 25. A method of dispensing a fluid from the pump according to claim 1, the method comprising: exerting an axial force on the pump body between the pump inlet and the pump outlet to overcome a bias force and cause the pump chamber to collapse during a pumping stroke from an initial condition to a collapsed condition, whereby fluid contained in the pump chamber is dispensed through the pump outlet; andreleasing the axial force, allowing the bias force to return the pump chamber to its initial condition in a return stroke, whereby fluid is drawn into the pump chamber through the pump inlet.