초록 ▼

A dispenser pump is disclosed of the moveable-nozzle type, arranged for sealing a vent path in the extended position of the pump plunger. A pump body includes an internal collar formed at the lower end of a tubular insert, through which the vent path passes. This collar has a seal portion. The plung

A dispenser pump is disclosed of the moveable-nozzle type, arranged for sealing a vent path in the extended position of the pump plunger. A pump body includes an internal collar formed at the lower end of a tubular insert, through which the vent path passes. This collar has a seal portion. The plunger has a complementary seal portion which makes a guided and fitting engagement with the collar seal portion. One or both of the plunger seal portion and the collar seal portion is formed as an annular taper, so that the seal portions are guided into close engagement with one another. Plunger lock-down formations are constructed to engage at the bottom of the body insert and remain below the top opening of the body.

대표청구항 ▼

1. A dispenser pump for dispensing product from a container, said dispenser pump comprising: a pump body including a cylinder member, a collar insert assembled to said cylinder member and a retainer cap captured by combination of said collar insert and said cylinder member;a plunger received within

1. A dispenser pump for dispensing product from a container, said dispenser pump comprising: a pump body including a cylinder member, a collar insert assembled to said cylinder member and a retainer cap captured by combination of said collar insert and said cylinder member;a plunger received within said pump body, said plunger having an inner tubular portion and an outer wall;a seal member assembled to said collar insert and contacting said outer wall; andan air vent passage constructed and arranged for supplying make up air to said container, wherein said air vent passage includes an inlet defined by said seal member and said collar insert. 2. The dispenser pump of claim 1 wherein said air vent passage includes an outlet defined by said cylinder member. 3. The dispenser pump of claim 2 wherein said air vent passage includes a first portion which extends between said outer wall and said collar insert and a second portion which extends between said collar insert and said cylinder member. 4. A dispenser pump for dispensing product from a container, said dispenser pump comprising: a pump body including a cylinder member, a collar insert assembled to said cylinder member and a retainer cap captured by combination of said collar insert and said cylinder member;a plunger received within said pump body, said plunger having an inner tubular portion and an outer wall;a seal member assembled to said collar insert and contacting said outer wall; andan air vent passage constructed and arranged for supplying make up air to said container, wherein said collar insert includes a formation portion for plunger lock down, said outer wall including a cooperating formation portion, wherein when said plunger is in a locked-down condition, a portion of said air vent passage extends between the formation portion of said collar insert and the formation portion of said outer wall and is closed off by a sealed interface between inner tubular portion and said collar insert. 5. A dispenser pump for dispensing product from a container, said dispenser pump comprising: a pump body including a cylinder member, a collar insert assembled to said cylinder member and a retainer cap captured by combination of said collar insert and said cylinder member;a plunger received within said pump body, said plunger having an inner tubular portion and an outer wall;a seal member assembled to said collar insert and contacting said outer wall; andan air vent passage constructed and arranged for supplying make up air to said container, wherein said collar insert includes a seal portion and said inner tubular portion includes a cooperating seal portion for sealing off said air vent passage when said plunger is in an extended position. 6. A dispenser pump for dispensing product from a container, said dispenser pump comprising: a pump body including a cylinder member, a collar insert assembled to said cylinder member and a retainer cap captured between combination of said collar insert and said cylinder member;a plunger received within said pump body, said plunger having an inner tubular portion and an outer wall;an air vent passage between said inner tubular portion and said collar insert constructed and arranged for supplying make up air to said container; andwherein said collar insert includes a seal portion and said inner tubular portion includes a cooperating seal portion for sealing off said air vent passage when said plunger is in an extended position. 7. The dispenser pump of claim 6 wherein when said plunger is in a locked-down condition, a sealed interface is established by engagement between said inner tubular portion and said collar insert. 8. The dispenser pump of claim 7 wherein said sealed interface is established between the seal portion of said collar insert and a tapered surface of said inner tubular portion. 9. The dispenser pump of claim 6 which further includes a gas vent notch defined by a stem wall of said plunger and cooperating with said air vent passage. 10. The dispenser pump of claim 9 wherein said gas vent notch has a size which is dependent in part on product viscosity. 11. The dispenser pump of claim 6 which further includes a seal member assembled to said collar insert and contacting said outer wall. 12. A dispenser pump for dispensing product from a container, the dispenser pump comprising a pump body having a pump cylinder portion;a plunger which has a head, a stem and a piston, the plunger being reciprocable relative to the pump body;a pump outlet structure providing a discharge passage extending from a pump chamber to a discharge opening of the pump;an air vent path for admitting make-up air into said container, said vent path being defined through said pump from a vent inlet through a clearance between the plunger stem and pump body to a vent outlet defined by a cylinder wall of said pump body;said pump body comprising a collar portion and the vent path leading through a vent gap defined between the collar portion and the stem of the plunger;the collar portion includes a seal portion and the plunger stem includes a cooperating seal portion for sealing off said vent path when said plunger is in an extended position; andthe pump body comprising a cylinder body member and an insert housing, the cylinder body member having a lower portion defining said pump chamber and the insert housing being tubular with a generally cylindrical side wall, the plunger stem being inside the insert housing with clearance between them, the tubular insert housing having a floor with a central opening through which the plunger stem passes and which comprises said collar portion and collar seal portion, part of said vent path before said vent gap being provided by said clearance between the plunger stem and the insert housing and part of said vent path after said vent gap being provided by clearance between the outside of the insert housing and the inside of the wall of the cylinder body member. 13. A dispenser pump according to claim 12 in which one or both of the plunger stem seal portion and the collar seal portion are tapered to guide said seal portions into fitting engagement with one another. 14. A dispenser pump according to claim 13 in which one of the plunger stem seal portion and the collar seal portion has a taper surface and the other of the plunger stem seal portion and the collar seal portion has a corner edge which meets a mid-region of said taper surface to make the sealing engagement as a line of engagement. 15. A dispenser pump according to claim 13 in which each of the plunger stem seal portion and the collar seal portion has a respective taper surface. 16. A dispenser pump according to claim 12 in which both the plunger stem seal portion and the collar seal portion are annular. 17. A dispenser pump according to claim 12 in which the plunger stem seal portion is formed as a taper on the plunger stem. 18. A dispenser pump according to claim 12 in which the plunger stem seal portion is formed as a taper at a transition from the stem to the piston. 19. A dispenser pump according to claim 12 in which said clearance between the outside of the insert housing and the inside of the wall of the cylinder body member, providing a part of said vent path after said vent gap, is an annular clearance. 20. A dispenser pump according to claim 12 comprising respective lock-down formations on the pump body and plunger which can be engaged with one another to hold the plunger in the retracted position relative to the body. 21. A dispenser pump according to claim 12 in which the tubular insert housing projects down inside the cylinder body member below the vent outlet defined by the cylinder wall. 22. A dispenser pump according to claim 12 in which the discharge passage has an outlet valve, and the outlet valve comprises a valve member, a valve seat and a spring urging the valve member against the valve seat. 23. A dispenser pump according to claim 12 in which the pump is a movable-nozzle pump having the discharge channel and discharge opening comprised in the plunger, and comprises a pump spring urging the plunger towards the extended position relative to the pump body a lower end of the insert housing providing a support for a lower end of said pump spring. 24. A dispenser pump according to claim 12 in which one or both of said plunger seal portion and collar seal portion has a slot or groove to allow gas venting past the vent path seal. 25. A dispenser pump for dispensing product from a container, the dispenser pump comprising a pump body having a pump cylinder portion;a plunger which has a head, a stem and a piston, the plunger being reciprocable relative to the pump body;a pump outlet structure providing a discharge passage extending from a pump chamber to a discharge opening of the pump;an air vent path for admitting make-up air into said container, said vent path being defined through said pump from a vent inlet through a clearance between the plunger stem and pump body to a vent outlet defined by a cylinder wall of said pump body;said pump body comprising a collar portion and the vent path leading through a vent gap defined between the collar portion and the stem of the plunger;the collar portion includes a seal portion and the plunger stem includes a cooperating seal portion for sealing off said vent path when said plunger is in an extended position;the pump body comprising a cylinder body member and an insert housing, the cylinder body member having a lower portion defining said pump chamber and the insert housing being tubular, with the plunger stem inside the insert housing and with clearance between them, the insert housing having a floor with a central opening through which the plunger stem passes and which comprises said collar portion and collar seal portion, part of said vent path before said vent gap being provided by said clearance between the plunger stem and the insert housing; andthe dispenser pump further comprising respective lock-down formations on the pump body and plunger which can be engaged with one another to hold the plunger in the retracted position relative to the body, and in which the plunger stem has a downwardly-directed seal element and the pump body has a corresponding upwardly-directed seal element which seal elements co-operate to block the vent path in the retracted position of the plunger relative to the body. 26. A dispenser pump according to claim 25 in which the upwardly-directed seal element of the pump body is on said collar portion of the insert housing. 27. The dispenser pump of claim 25 which further includes a seal member assembled to said collar portion and contacting said plunger. 28. A dispenser pump for dispensing product from a container, the dispenser pump comprising a pump body which has a top opening and comprises a pump cylinder portion defining a pump chamber and an inlet to the pump chamber, said pump body including a collar insert;a plunger which has a head, a stem and a piston, the piston being at a lower end of the stem and in said pump chamber;a pump outlet structure providing a discharge channel extending from the pump chamber to a discharge opening of the pump;the structure of said pump also defining a vent path for admitting air into a said container to compensate for the volume of product dispensed in use, said vent path being defined through said pump from an exterior vent opening, where air is admitted, to a clearance between the collar insert and pump body outside the pump chamber, and thence to an interior vent opening, said interior vent opening being defined through or around an edge of a cylinder wall of said pump body to lead to the interior of said container;the dispenser pump further comprising respective lock-down formations on the pump body and plunger which can be engaged with one another to hold the plunger in the retracted position relative to the body, and the pump body has a seal member around the top opening thereof, said seal member acting against the outer surface of the plunger stem. 29. A dispenser pump according to claim 28 in which the pump body comprises a cylinder body member, the cylinder body member having a lower portion defining said pump chamber and the insert housing being tubular and projecting down inside the cylinder body member so as to occupy an upper portion thereof. 30. A dispenser pump according to claim 29 in which the pump is a movable-nozzle pump having the discharge channel and discharge opening comprised in the plunger, and comprises a pump spring urging the plunger towards the extended position relative to the pump body. 31. A dispenser pump for dispensing product from a container, said dispenser pump comprising: a pump body including a cylinder member, a collar insert assembled to said cylinder member and a retainer cap captured by combination of said collar insert and said cylinder member;a plunger received within said pump body, said plunger having an inner tubular portion and an outer wall;a seal member assembled to said collar insert and contacting said outer wall; andan air vent passage constructed and arranged for supplying make up air to said container, wherein said air vent passage includes an inlet which is defined by said collar insert and said seal member, wherein said inlet begins at the radially outer surface of said seal member. 32. A dispenser pump for dispensing product from a container, said dispenser pump comprising: a pump body including a cylinder member, a collar insert assembled to said cylinder member and a retainer cap captured by combination of said collar insert and said cylinder member;a plunger received within said pump body, said plunger having an inner tubular portion and an outer wall;a seal member assembled to said collar insert and contacting said outer wall;an air vent passage constructed and arranged for supplying make up air to said container; anda spring positioned between said inner tubular portion and said outer wall, wherein said spring is isolated from contact with said product. 33. A dispenser pump for dispensing product from a container, said dispenser pump comprising: a pump body including a cylinder member, a collar insert assembled to said cylinder member and a retainer cap captured by combination of said collar insert and said cylinder member;a plunger received within said pump body, said plunger having an inner tubular portion and an outer wall;a seal member assembled to said collar insert and contacting said outer wall; andan air vent passage constructed and arranged for supplying make up air to said container, wherein when said plunger is in a locked-down condition, a sealed interface is established by engagement between said inner tubular portion and said collar insert. 34. A dispenser pump for dispensing product from a container, said dispenser pump comprising: a pump body including a collar insert;a plunger received within said pump body, said plunger including a plunger stem with a stem wall, said plunger being constructed and arranged for reciprocating movement within said pump body;a vent passage defined between said collar insert and said plunger for venting of internal gas; anda gas vent notch defined by said stem wall and cooperating with said vent passage. 35. The dispenser pump of claim 34 wherein said gas vent notch has a size which is dependent in part on product viscosity.