The present invention provides a dispenser for dispensing a fluid which has an anti-drip feature. To achieve this anti-drip feature, the dispenser is provided with a suck back mechanism which is separate and independent from a pump in the dispenser. The suck back mechanism uses a resilient member ca
The present invention provides a dispenser for dispensing a fluid which has an anti-drip feature. To achieve this anti-drip feature, the dispenser is provided with a suck back mechanism which is separate and independent from a pump in the dispenser. The suck back mechanism uses a resilient member capable of storing fluid.
대표청구항▼
1. A dispenser for dispensing a fluid said dispenser comprising: a reservoir for holding a fluid;a pump in communication with the reservoir, the pump comprises an inlet, an outlet and a recovery means, wherein the pump has an idle stage, a discharging stage in which a shot of the fluid is expelled f
1. A dispenser for dispensing a fluid said dispenser comprising: a reservoir for holding a fluid;a pump in communication with the reservoir, the pump comprises an inlet, an outlet and a recovery means, wherein the pump has an idle stage, a discharging stage in which a shot of the fluid is expelled from the pump through the outlet; a charging stage in which a shot of the fluid is drawn from the reservoir through the inlet into the pump and the recovery means returns the pump to the idle stage from the discharging stage and through the charging stage;a suck back mechanism which is separate from the pump, said suck back mechanism comprising a resilient member capable of storing fluid, a first opening and a second opening, the first opening being connected to the second opening by a passageway, and at least one vent is located in the passageway, said vent allows a fluid to leave the passageway and enter the resilient member capable of storing fluid, wherein the resilient member capable of storing fluid is positioned between the first opening and the second opening and the first opening of the suck back mechanism is connected to the outlet of the pump; anda dispensing end for dispensing the fluid from the dispenser, the dispensing end being connected to the second opening of the suck back mechanism,whereby at the end of the discharging stage of the pump, undispensed fluid remains between the dispensing end and the second opening of the suck back mechanism and a portion of the undispensed fluid is drawn into the resilient member capable of storing fluid. 2. The dispenser according to claim 1, wherein the recovery means of the pump is a compressible member. 3. The dispenser according to claim 2, wherein the compressible member comprises a spring. 4. The dispenser according to claim 1, wherein during the pump's discharging stage, an external force is applied to the resilient member, the external force compresses the resilient member causing the portion of fluid present in the resilient member to be discharged from the resilient member into the passageway, thereby refilling the dispenser between the second opening of the suck back mechanism and the dispensing end while the shot of fluid present in the pump is expelled through the outlet of the pump. 5. The dispenser according to claim 1, wherein the drawing of the portion of the fluid located between the dispensing end and the second opening of the suck back mechanism into the resilient member occurs simultaneously with the charging stage of the pump. 6. The dispenser according to claim 1, further comprising a pump outlet tube, the pump outlet tube connects the pump outlet to the first opening of the suck back mechanism. 7. The dispenser according to claim 1, wherein the resilient member capable of storing fluid is prepared from an elastomeric material. 8. The dispenser according to claim 7, wherein the resilient member capable of storing fluid has a corrugated shape or a truncated cone shape. 9. The dispenser according to claim 1, wherein the suck back mechanism comprises a single resilient member. 10. The dispenser according to claim 1, wherein the resilient member capable of storing fluid is a hollow member, the hollow portion of the hollow member is capable of holding a fluid. 11. A dispenser for dispensing a fluid said dispenser comprising: a reservoir for holding a fluid;a pump in communication with the reservoir, the pump comprises an inlet, an outlet and a recovery means, wherein the pump has an idle stage, a discharging stage in which a shot of the fluid is expelled from the pump through the outlet; a charging stage in which a shot of the fluid is drawn from the reservoir through the inlet into the pump and the recovery means returns the pump to the idle stage from the discharging stage and through the charging stage;a suck back mechanism which is separate from the pump, said suck back mechanism comprising a resilient member capable of storing fluid, a body comprising the first opening, the second opening, a primary fluid passageway between the first and second opening, the primary passageway connecting the first and second openings to one another, and at least one secondary passageway having a first end and a second end, the resilient member being located at the second end of the secondary passageway and the first end of the secondary pathway being located along primary fluid pathway such that the fluid can be drawn into the resilient member capable of storing a fluid from the primary passageway and through the secondary passageway wherein the first opening of the suck back mechanism is connected to the outlet of the pump; anda dispensing end for dispensing the fluid from the dispenser, the dispensing end being connected to the second opening of the suck back mechanism, whereby at the end of the discharging stage of the pump, undispensed fluid remains between the dispensing end and the second opening of the suck back mechanism and a portion of the undispensed fluid is drawn into the resilient member capable of storing fluid. 12. The dispenser according to claim 11, wherein the suck back mechanism comprises a plurality of resilient members capable of storing fluid. 13. The dispenser according to claim 12, wherein the suck back mechanism comprises two resilient members. 14. The dispenser according to claim 11, wherein there are two secondary pathways and a resilient member capable of storing fluid is located at the second end of each of the secondary pathways. 15. The dispenser according to claim 11, wherein the pump further comprises a housing having a fluid chamber comprising an interior wall, a piston positioned within the fluid chamber and the piston being telescopingly movable within the fluid chamber, said piston creating a seal with the interior wall of the fluid chamber, an inlet valve located at or near the inlet of the pump, and an outlet valve located at or near the outlet of the pump. 16. The dispenser according to claim 15, wherein the housing further forms a second chamber having an interior wall, the piston is telescopingly movable within the second chamber and creates a seal with the interior wall of the second chamber, said second chamber having a second inlet and a second outlet, wherein the second outlet is located at or near the outlet of the pump and the second inlet is positioned within the pump such that it is on a side of the pump which does not come into contact with the fluid within the reservoir. 17. The dispenser according to claim 16, wherein the second inlet of the pump is an air inlet, which is adapted to allow atmospheric air to enter the second chamber of the pump, but will not allow atmospheric air in the second chamber to escape through the second inlet. 18. The dispenser according to claim 11, wherein the recovery means comprises a spring;during the pump's discharging stage, an external force is applied to the resilient member, the external force compresses the resilient member causing the portion of fluid present in the resilient member to be discharged from the resilient member thereby refilling the dispenser between the second opening in the suck back mechanism and the dispensing end while the shot of fluid present in the pump is expelled through the outlet of the pump;the drawing of the portion of the fluid located between the dispensing end and the second opening of the suck back mechanism occurs simultaneously with the charging stage of the pump;the pump further comprises a housing which has a fluid chamber comprising an interior wall, a piston positioned within the fluid chamber and the piston being telescopingly movable within the fluid chamber, said piston creating a seal with the interior wall of the fluid chamber, an inlet valve located at or near the inlet of the pump, and an outlet valve located at or near the outlet of the pump. 19. The dispenser according to claim 18, wherein there are two secondary passageways and a resilient member is located at the second end of each of the secondary passageways. 20. The dispenser according to claim 19, wherein the resilient member capable of storing fluid has a truncated cone shape. 21. The dispenser according to claim 11, wherein the resilient member capable of storing fluid is a hollow member, the hollow portion of the hollow member is capable of holding a fluid.
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이 특허에 인용된 특허 (27)
Heiner Ophardt CA; Ali Mirbach DE, Apparatus for making and dispensing foam.
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