Claims
- 1. A pump comprising:a pump body; a moving member that is movable relative to said body, wherein said moving member has a piston that co-operates with the pump body to define a pump chamber of variable volume; and an elastically deformable membrane configured to return the moving member into an initial position after a stroke of said moving member for delivering a substance, the membrane comprising a sealing skirt, wherein said sealing skirt has a first surface bearing, at rest, in leakproof manner against a corresponding surface of the moving member, wherein said sealing skirt is suitable for moving away from said corresponding surface of the moving member when a suction is applied to a second surface of the sealing skirt opposite to said first surface, in such a manner as to form an air intake passage between the sealing skirt and the moving member.
- 2. A pump according to claim 1, wherein said air intake passage communicates with a receptacle in which a product is sucked by the pump.
- 3. A pump according to claim 1, wherein the moving member has an annular rib and said membrane is secured to said rib.
- 4. A pump according to claim 3, wherein said rib is provided with at least one slot and said air intake passage communicates with said slot.
- 5. A pump according to claim 1, wherein the moving member comprises a rod provided with an internal passage for delivering a substance contained in the pump chamber, the internal passage opening out into the pump chamber via at least one orifice; andwherein the piston is movable relative to the rod between a pre-compression position in which it closes said at least one orifice and a delivery position in which the piston releases said at least one orifice, the piston being moved from the pre-compression position to the delivery position under the effect of the pressure of the substance inside the pump chamber.
- 6. A pump according to claim 5, wherein the piston is configured to deform elastically so as to release the at least one orifice.
- 7. A pump according to claim 6, wherein the piston has an annular sealing wall suitable for bearing against the pump body and against the rod so as to isolate the at least one orifice while the chamber is being filled, and an elastically deformable return wall bearing against the rod and suitable for deforming elastically to enable the annular sealing wall to be moved and to enable communication to be established between said at least one orifice and the pump chamber while delivering a quantity of substance.
- 8. A pump according to claim 7, wherein said return wall is deformed under the effect of the pressure of the substance inside the pump chamber.
- 9. A pump according to claim 8, wherein an axial section of the piston is generally λ-shaped.
- 10. A pump according to claim 8, wherein an axial section of the piston is generally Σ-shaped.
- 11. A pump according to claim 8, wherein an axial section of the piston is generally X-shaped.
- 12. A pump according to claim 8, wherein the return wall of the piston bears against a shoulder on the rod.
- 13. A pump according to claim 5, wherein the piston is urged into the pre-compression position by a spring.
- 14. A pump according to claim 1, wherein the piston is fitted on a rod of the moving member.
- 15. A pump according to claim 1, wherein the pump chamber communicates with a receptacle via a duct; andwherein said moving member is configured to close said duct during part of a stroke for delivering a quantity of substance.
- 16. A pump according to claim 15, wherein the moving member is configured to engage in leakproof manner in said duct during part of said stroke.
- 17. A pump according to claim 1, wherein said pump body has an air intake hole;wherein said air intake hole is isolated from a space inside said pump body above the piston by the piston when the moving member is in said initial position; and wherein the piston is configured to enable communication to take place between the air intake hole and said space when the moving member has moved over a predetermined stroke inside the pump body to reduce the volume of the pump chamber.
- 18. A pump according to claim 1, wherein the moving member has an end snap-fastened in an opening of the pump body.
- 19. A pump according to claim 1, wherein the membrane is made of a material selected from nitrile elastomer, silicone elastomer, BUNA™, vulcanized elastomer, and thermoplastic elastomer.
- 20. A pump according to claim 1, wherein the piston is made of a material selected from LDPE, EVA, EMA, and SANTOPRENE™.
- 21. A receptacle fitted with a pump as defined in claim 1.
- 22. A pump according to claim 1, wherein said membrane is outside the pump chamber such that a substance to be pumped does not contact any portion of the membrane.
- 23. A pump comprising:a pump body; a moving member that is movable relative to said pump body, wherein said moving member has a piston that co-operates with the pump body to define a pump chamber of variable volume; and an elastically deformable membrane outside the pump chamber such that a substance to be pumped does not contact any portion of the membrane and arranged to return the moving member into an initial position after a stroke of said moving member for delivering a substance, said membrane being configured to elongate when the volume of the pump chamber decreases, wherein said pump has a duct through which said pump chamber communicates with a receptacle, said duct and said moving member being configured so that said duct is closed by the moving member during part of said stroke.
- 24. A pump according to claim 23, wherein said pump body has a bottom wall; andwherein said duct has a cylindrical wall connected to a face of said bottom wall.
- 25. A pump according to claim 23, wherein the membrane comprises a sealing skirt that, at rest, bears in leakproof manner via a first surface against a corresponding surface of the moving member to close an air intake passage between the membrane and the moving member, said sealing skirt being suitable for moving away from said surface when suction is applied to a second surface opposite to said first surface in such a manner as to enable air to enter into the receptacle via said air intake passage.
- 26. A pump according to claim 25, wherein the moving member has an annular rib to which the membrane is secured, said rib being provided with at least one slot.
- 27. A pump according to claim 23, wherein the moving member comprises a rod possessing an internal passage for delivering the substance contained in the pump chamber, the internal passage opening out into the pump chamber via at least one orifice; andwherein the piston is movable relative to the rod between a pre-compression position in which the piston closes said at least one orifice, the piston being moved from the pre-compression position to a delivery position under the effect of the pressure of substance inside the pump chamber.
- 28. A pump according to claim 27, wherein the piston is arranged to deform elastically so as to release the at least one orifice when the piston is in said delivery position.
- 29. A pump according to claim 28, wherein the piston has an annular sealing wall suitable for bearing against the pump body and against the rod so as to close the at least one orifice while the chamber is being filled, and an elastically deformable return wall bearing against the rod and suitable for deforming elastically to enable the annular sealing wall to be moved and to enable communication to be established between said at least one orifice and the pump chamber while delivering a quantity of substance.
- 30. A pump according to claim 29, wherein said return wall is deformed under the effect of the pressure of the substance inside the pump chamber.
- 31. A pump according to claim 29, wherein an axial section of the piston is generally λ-shaped.
- 32. A pump according to claim 29, wherein an axial section of the piston is generally Σ-shaped.
- 33. A pump according to claim 29, wherein an axial section of the piston is generally X-shaped.
- 34. A pump according to claim 29, wherein the return wall of the piston bears against a shoulder on the rod.
- 35. A pump according to claim 27, wherein the piston is urged into the pre-compression position by a spring.
- 36. A pump according to claim 23, wherein the piston is fitted on a rod of said moving member.
- 37. A pump according to claim 23, wherein the membrane is made of a material selected from nitrile elastomer, silicone elastomer, BUNA™, vulcanized elastomer, and thermoplastic elastomer.
- 38. A pump according to claim 23, wherein the piston is made of a material selected from LDPE, EVA, EMA, and SANTOPRENE™.
- 39. A receptacle fitted with a pump as defined in claim 23.
- 40. A pump according to claim 23, wherein the moving member is configured to engage in leakproof manner in said duct.
Priority Claims (1)
Number |
Date |
Country |
Kind |
99 13346 |
Oct 1999 |
FR |
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Parent Case Info
This is a Division of application Ser. No. 09/694,352 filed Oct. 24, 2000. The entire disclosure of the prior application(s) is hereby incorporated by reference herein in its entirety.
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