Pump and dispenser for dispensing a fluid

Abstract

The invention relates to a pump for a dispenser for dispensing a fluid and to a dispenser having a pump, wherein a side wall of a pump housing of the pump has a ventilation opening.

Description

[0001] Pump and dispenser for dispensing a fluid

[0002] The present invention relates to a pump for a dispenser for dispensing a fluid according to the preamble of claim 1 or 7 and a dispenser.

[0003] Pumps of this type are generally known in the prior art.

[0004] Typically, pumps or dispensers of this type are equipped with a dispensing head. Pressing down on the dispensing head activates the pump, drawing fluid, particularly from a reservoir within the dispenser, and dispensing it through the dispensing head. The fluid is preferably a cleaning or cosmetic product, such as a bathroom or glass cleaner, shower gel, shampoo, cream, perfume, lotion, or the like.

[0005] To equalize pressure or prevent a vacuum from forming in the container, the pump or dispenser typically has a vent through which air can enter the container from the outside during pumping. The vent can be located, for example, in a side wall of the pump housing, as shown in EP 0806249 B1.

[0006] At the same time, it should be prevented that product or fluid contained in the container escapes to the outside through the ventilation opening.

[0007] This is particularly difficult with pumps where the dispensing head can be locked in a lower or activated position. Locking in the lower or activated position offers the advantage of requiring less space, especially in retail or on shelves, but usually comes with the problem that product can leak out if the dispenser is tilted, particularly through an unsealed vent.

[0008] The present invention addresses this problem.

[0009] It is therefore an object of the present invention to avoid the aforementioned disadvantages of the prior art and / or to provide a pump or dispenser with an improved seal and / or to provide a pump or dispenser in which an unwanted leakage of product, in particular

[0010] VR26-4018-2 is prevented in a locked state and / or when the dispensing head is in a lower, retracted, or actuated position.

[0011] The above problem is solved by a pump according to claim 1 or 7 or a dispenser according to claim 21. Advantageous further developments are the subject of the dependent claims.

[0012] The pump according to the invention is designed for use in or with a dispenser for dispensing a fluid. The dispenser preferably has a container for receiving the fluid and the pump, so that the fluid can be pumped from the container and then dispensed by the dispenser, in particular by means of a dispensing head.

[0013] The pump has a pump housing with an upper end, a lower end, and a preferably cylindrical side wall between the upper and lower ends. The pump housing encloses a pump chamber.

[0014] The side wall of the pump housing has a ventilation opening, which is specifically designed for venting a container. This container is, in particular, a container connected or connectable to the pump, in which the fluid to be pumped is held or can be received.

[0015] Preferably, the pump has a piston that is movable linearly along an axis between an upper position and a lower position within the pump housing or pump chamber. The piston divides the pump chamber into an upper section and a lower section, with the upper section being located between the piston and the upper end of the pump housing and the lower section being located between the piston and the lower end of the pump housing.

[0016] Alternatively or additionally to the piston, the pump has a pump shaft partially located within the pump housing or pump chamber and a discharge head located outside the pump housing at one end of the pump shaft, wherein the discharge head and the pump shaft are jointly movable linearly along an axis between an extended position and a retracted position. The pump chamber has a radially spaced

[0017] VR26-4018-2 the space between the side wall and the pump shaft.

[0018] According to a first aspect, the pump, in particular the piston, has a seal by means of which, at least in the lower position of the piston, preferably in both the lower position and the upper position of the piston, the passage of fluid from the vent opening into the upper section is prevented.

[0019] According to another aspect, which can also be implemented independently, the piston has at least one seal for sealing contact with the side wall, wherein the seal seal is in sealing contact between the ventilation opening and the upper section of the side wall at least in the lower position of the piston, preferably both in the lower position and in the upper position of the piston.

[0020] According to another aspect, which can also be implemented independently, the piston has an upper seal for sealing contact with the side wall and a lower seal for sealing contact with the side wall, wherein in the lower position the ventilation opening is arranged between the upper seal and the lower seal and / or the upper seal is arranged between the upper section and the ventilation opening, preferably wherein in the upper position of the piston at least the upper seal, in particular the upper seal and the lower seal, is / are arranged between the ventilation opening and the upper section.

[0021] According to another aspect, which can also be implemented independently, the pump has a seal by means of which, at least in the retracted position, and preferably in both the retracted and extended positions, fluid is prevented from passing from the vent opening into the space between the pump and the pump.

[0022] The aforementioned aspects prevent the unintentional release of product or fluid contained in the container, especially when the piston is in the lower position and / or the dispensing head is in the retracted position or locked in this position.

[0023] VR26-4018-2 The passage of fluid from the vent opening into the upper section or intermediate space is preferably prevented by the seal in such a way that the seal is in a tight seal against the side wall, particularly when the piston is in the lower and / or upper position and / or when the pump shaft or discharge head is in the retracted and / or extended position. This effectively prevents unwanted fluid leakage.

[0024] Preferably, the ventilation opening is arranged such that it is located below the lower seal in the upper position of the piston or the extended position of the dispensing head.

[0025] Preferably, the side wall has a ventilation channel on its inside, in particular wherein the ventilation channel is arranged such that when the piston moves between the upper position and the lower position and / or when the dispensing head or pump shaft moves between the extended position and the retracted position, the ventilation channel is swept over by the piston or the seal, or the piston or the seal is moved past the ventilation channel.

[0026] The ventilation opening and the ventilation channel are preferably arranged such that during a movement of the piston between the upper position and the lower position and / or during a movement of the dispensing head or pump shaft between the extended position and the retracted position, air can pass from the space or upper section through the ventilation channel to the ventilation opening.

[0027] Preferably, the ventilation opening and the ventilation channel are arranged such that during a movement of the piston between the upper position and the lower position and / or a movement of the dispensing head or pump shaft between the extended position and the retracted position, the ventilation opening is arranged below the seal, in particular the upper seal, and / or between the seals, and at the same time the seal, in particular the upper seal, is arranged in the area of ​​the ventilation channel, in particular wherein the inside of the side wall in the area of ​​the ventilation channel is spaced away from the seal and / or so that air can pass through the ventilation channel and / or between the side wall and the seal.

[0028] VR26-4018-2 Preferably, air can pass from the ventilation opening through the ventilation channel past the piston into the upper section or space if the (upper) seal is located at the level of the ventilation channel.

[0029] The design and / or arrangement of the ventilation opening and / or ventilation channel enables or achieves ventilation of the container during pump operation. This prevents the formation of a vacuum in the container when pumping or transferring fluid from the container.

[0030] The ventilation channel is preferably formed by an unevenness on the inside of the side wall and / or between two projections on the inside. This is technically easy to implement, thus enabling simple manufacturing and effective ventilation.

[0031] The piston is preferably coupled to the pump shaft and / or the discharge head, particularly wherein the piston is arranged at an end of the pump shaft opposite the discharge head. Fluid pumped by the pump can be discharged from the pump via the discharge head.

[0032] Preferably, in the extended position of the dispensing head or pump shaft, the piston is arranged in the upper position and / or in the retracted position of the dispensing head or pump shaft, the piston is arranged in the lower position.

[0033] The piston is preferably movable relative to the pump shaft, in particular linearly along the axis. This enables, in particular, automatic and / or pressure-controlled opening and / or closing of a pump outlet valve.

[0034] It is preferred that the piston has two seals, in particular an upper seal and a lower seal. This enables, on the one hand, reliable sealing or prevention of unwanted fluid leakage and, on the other hand, ventilation, especially during a pumping process or movement of the piston.

[0035] The dispensing head is preferably lockable in the retracted position and / or in the extended position, so that in the locked state (in each case) movement of the dispensing head along the axis is blocked. Locking allows

[0036] VR26-4018-2 prevents unwanted operation. Furthermore, the locking mechanism in the retracted position reduces the space required for storage and / or transport.

[0037] The ventilation opening is preferably a radial opening in the side wall.

[0038] According to a further aspect, which can also be implemented independently, the present invention relates to a dispenser for dispensing a fluid, wherein the dispenser has a pump designed as described herein. In addition to the pump, the dispenser preferably has a container for the fluid.

[0039] The advantages of the pump explained above are achieved accordingly by the dispenser.

[0040] The aspects and features mentioned above, as well as other aspects and features arising from the requirements and the following description, can be implemented independently of each other and in various combinations.

[0041] Further advantages, features, properties and aspects of the present invention will become apparent from the claims and the following description of preferred embodiments with reference to the drawing. It shows:

[0042] Fig. 1 shows a section of a dispenser according to the invention with a pump according to the invention in a first, in particular unactuated, state;

[0043] Fig. 2 shows a section of the dispenser from Fig. 1 in a second, in particular activated, state;

[0044] Fig. 3 shows a section of the dispenser from Fig. 1 in a first intermediate state during an actuation;

[0045] Fig. 4 shows a section of the dispenser from Fig. 1 in a second intermediate state during an actuation;

[0046] Fig. 5 shows a section of the pump according to the invention, wherein the section plane of Fig. 3 is perpendicular to the section plane of Figs. 1 and 2; and

[0047] VR26-4018-2Fig. 6 shows a section along the section line Vl-Vl from Fig. 5.

[0048] In the figures, which are sometimes not to scale and only schematic, the same reference symbols are used for identical or similar parts, whereby corresponding or comparable properties and advantages can be achieved even if a repeated description is omitted.

[0049] Figure 1 shows a schematic representation of a pump 1 and a dispenser 2. In this example, the pump 1 is part of the dispenser 2 or is located within the dispenser 2. However, the pump 1 can also be implemented independently of the dispenser 2.

[0050] The dispenser 2 has a container 3 for receiving a schematically indicated fluid F. The container 3 preferably has or encloses an interior 3A.

[0051] Fluid F is preferably a cosmetic product, a medical product, a hygiene product, a cleaning product or the like, for example a deodorant, a perfume, a cream, a lotion, a shaving foam, a shower gel, a shampoo, a hair gel, a hairspray, a bathroom cleaner, a dishwashing liquid, an oven cleaner or the like.

[0052] The dispenser 2 or the pump 1 preferably has a dispensing head 4.

[0053] The fluid F is preferably contained in the dispenser 2 or container 3. The fluid F can be pumped from the container 3 via the pump 1 or the dispensing head 4 and / or dispensed from the dispenser 2 or to a user (not shown). For this purpose, the dispensing head 4 has at least one channel and a dispensing opening through which the fluid can flow from the pump 1 or the interior 8C of the pump shaft 8 (described below) into the dispensing head and be dispensed from the dispensing head 4. The channel and the dispensing opening are not shown in the schematic figures.

[0054] The pump 1 or the dispenser 2 is actuated in particular by pressing down the dispensing head 4, whereby the fluid F is preferably dispensed by means of the

[0055] VR26-4018-2 Pump 1 pumps from container 3 and delivers from dispensing head 4.

[0056] The dispenser 2 or dispensing head 4 is preferably designed to dispense the fluid F in its unchanged form. However, other solutions are also possible. For example, the dispenser 2 or dispensing head 4 can be designed to dispense the fluid F as a spray or aerosol, or as a foam.

[0057] The pump 1 and / or the dispenser 2 preferably has a central or longitudinal axis A. The central or longitudinal axis A is hereinafter referred to simply as axis A. Terms such as "axial" and "radial" preferably refer to axis A. Accordingly, an axial direction or extension is preferably a direction, extension, or movement that runs along or parallel to axis A. A radial direction is accordingly a direction that runs radially to axis A.

[0058] Furthermore, relative designations or location specifications such as "top", "bottom" and the like refer to the position of the pump 1 or the dispenser 2 shown in Figs. 1 and 2, which in particular represents the usual position of the pump 1 or the dispenser 2 during non-use and / or storage.

[0059] The pump 1 has a pump housing 5. The pump housing 5 has an upper end 5A, a lower end 5B, and a side wall 6. The side wall is, in particular, at least substantially and / or partially cylindrical and / or is located between the upper end 5A and the lower end 5B.

[0060] The pump housing 5 encloses a pump chamber 7.

[0061] The pump 1 preferably has a pump shaft 8 and / or a piston 9. The pump shaft 8 is preferably partially arranged in the pump housing 5 or the pump chamber 7. One end 8A, in particular the upper end 8A, of the pump shaft 8 is preferably arranged outside the pump chamber 7 and / or the pump housing 5.

[0062] The pump shaft 8 is preferably movable linearly and / or along axis A, or reciprocally, in particular between an extended position and a retracted position. The extended position is shown in Fig. 1.

[0063] VR26-4018-2 and the retracted position are shown in Fig. 2. In the extended position, the pump shaft 8 preferably protrudes further from the pump chamber 7 or the pump housing 5 than in the retracted position.

[0064] The dispensing head 4 is preferably arranged or attached to the pump shaft 8, in particular to the (upper) end 8A. The dispensing head 4 is preferably movable together with the pump shaft 8, or movable back and forth, in particular between an extended position and a retracted position. In particular, the extended position of the pump shaft 8 corresponds to the extended position of the dispensing head 4 and the retracted position of the pump shaft 8 corresponds to the retracted position of the dispensing head 4.

[0065] The piston 9 is preferably arranged in the pump housing 5 or the pump chamber 7. The piston 9 is preferably movable between an upper position and a lower position, in particular movable back and forth. The upper position of the piston is shown in Fig. 1 and the lower position of the piston 9 is shown in Fig. 2. In the upper position, the piston 9 is preferably further away from the lower end 5B of the pump housing 5 or the pump chamber 7 than in the lower position.

[0066] The piston 9 is preferably movable relative to the pump shaft 8 and / or discharge head 4, in particular linearly and / or along the axis A. This is particularly evident from a comparison of the relative position of the piston 9 with respect to the pump shaft 8 in Figs. 1 and 2.

[0067] The pump chamber 7 is preferably divided into an upper section 7A and a lower section 7B by means of the piston 9. The upper section 7A is preferably located between the piston 9 and the upper end 5A of the pump housing 5. The lower section 7B is preferably located between the piston 9 and the lower end 5B of the pump housing 5.

[0068] A space 7C is preferably formed between the pump shaft 8 and the side wall 6. The space 7C is preferably arranged radially between the pump shaft 8 and the side wall 6. The space 7C is preferably a part or section of the pump chamber 7, in particular the upper section 7A. The space 7C is preferably identical to the upper section 7A or forms at least a part of it.

[0069] VR26-4018-2 The volume of the pump chamber 7 is preferably constant or unchanging. In particular, the volume of the pump chamber 7 does not change when the pump shaft 8 or piston 9 moves.

[0070] In other words, the movement of the pump shaft 8 or piston 9 merely results in the volumes of the upper section 7A or intermediate space 7C and the lower section 7B changing during the movement of the pump shaft 8 or piston 9, in particular since the piston 9 divides the pump chamber 7, while the overall volume of the pump chamber 7 remains constant.

[0071] Furthermore, the pump 1 preferably has an inlet 10, an outlet 11, an inlet valve 12 and / or an outlet valve 13.

[0072] The pump 1 can draw fluid F from the container 3 of the dispenser 2 and dispense it via the dispensing head 4. The piston 9 is axially movable to pump the fluid F through the inlet 10 into the pump chamber 7 and from the pump chamber 7 to the outlet 11.

[0073] The outlet 11 is preferably formed by a through-opening 8B in the pump shaft 8. The through-opening 8B is preferably formed at least substantially radially and / or arranged near a lower end of the pump shaft 8.

[0074] The outlet valve 13 is preferably formed by a seal 19 or a sealing lip 19, which bears against the pump shaft 8 or an outer surface of the pump shaft 8. The seal / sealing lip 19 is preferably formed integrally with the piston 9 and / or arranged on an inner surface of the piston 9.

[0075] In the unactuated position of the pump 1 shown in Fig. 1, or in the extended position of the pump shaft 8, the outlet valve 13 is preferably closed, with the seal / sealing lip in a sealing position against the pump shaft 8, particularly below the outlet 11 or the through-opening 8B. This prevents fluid F from the pump chamber 7 or the lower section 7B from reaching the through-opening 8B or the outlet 11.

[0076] VR26-4018-2 In the position of the pump 1 shown or actuated in Fig. 2 or in the extended position of the pump shaft 8, the outlet valve 13 is preferably open, in particular by the fact that the piston 9 has been moved relative to the pump shaft 8, so that at least a part of the through-opening 8B or the outlet 11 is released or is arranged below the seal, so that fluid F from the pump chamber 7 or the lower section 7B can reach the through-opening 8B or the outlet.

[0077] The previously mentioned mobility of the piston 9 relative to the pump shaft 8 thus enables, in particular, the (automatic) opening of the outlet valve 13, which is controlled especially by a fluid pressure in the pump chamber 7 or its lower section 7B. The outlet valve 13 preferably opens when a certain pressure is reached in the pump chamber 7 or the lower section 7B, which causes a displacement of the piston 9 relative to the pump shaft 8.

[0078] The outlet valve 13 is preferably (automatically) closed when the dispensing head 4 or pump shaft 8 moves into or reaches the extended position, in particular by the piston 9 moving against a stop shortly before reaching the extended position, so that the piston 9 is no longer moved before reaching the extended position and the pump shaft 8 moves relative to the piston or the seal / sealing lip 19, so that the outlet valve 13 is closed.

[0079] The pump 1, in particular the side wall 6, has a ventilation opening 14. The ventilation opening 14 preferably connects the pump chamber 7 with the interior 3A of the container 3, in particular so that air from outside or from the pump chamber 7 can enter the interior 3A.

[0080] The ventilation opening 14 is preferably a, in particular radial, opening in the side wall 6. The ventilation opening 14 enables, in particular, ventilation of the container 3, especially during a pumping process or movement of the piston 9, especially from the upper position to the lower position and / or vice versa, and / or movement of the pump shaft 8 and / or dispensing head 4, especially from the extended position to the retracted position and / or vice versa. Ventilation preferably therefore occurs (only)

[0081] VR26-4018-2 during a movement of piston 9 between the upper position and the lower position.

[0082] The pump 1 can have several ventilation openings 14, in particular arranged at the same height and / or distributed circumferentially across the side wall 6. This allows the ventilation or ventilation rate to be increased as required.

[0083] The pump 1 preferably has a return device 15, in particular a return spring, for pre-tensioning and / or returning the pump shaft 8 and / or discharge head 4 to the extended position.

[0084] The dispensing head 4 is preferably arranged or attached to the pump shaft 8, in particular such that the pump shaft 8 and the actuator 4 move axially together, especially when the dispensing head 4 is actuated or pushed down from the extended position shown in Fig. 1 towards the container 2 and / or moved back into the extended position, in particular by means of the reset device 15.

[0085] The pump 1, in particular the piston 9, preferably has at least one seal 16. The seal 16 is preferably designed to form a sealing contact with the side wall 6 or its inner surface 6A and / or is arranged on the outside of the piston 9.

[0086] Preferably, the pump 1 or the piston 9 has two seals 16, in particular an upper seal 16A and a lower seal 16B. The upper seal 16A and the lower seal 16B are each a seal 16.

[0087] The upper seal 16A and the lower seal 16B are preferably formed in one piece and / or by an upper sealing lip and a lower sealing lip of the piston 9. The piston 9 is preferably spaced apart from the side wall 6 or its inner surface 6A between the seals 16A, 16B or sealing lips.

[0088] The seal 16, 16A, in particular the upper seal 16A, preferably prevents the passage of fluid F from the ventilation opening 14 into the upper section 7A or space 7C, in particular by sealing against the side wall 6 or its inner side 6A, especially preferably in the lower

[0089] VR26-4018-2 and / or upper position of the piston 9 and / or in the retracted and / or extended position of the pump shaft 8 and / or delivery head 4.

[0090] In other words, preferably at least one of the seals 16, in particular the upper seal 16A, is arranged between the vent opening 14 and the upper section 7A or space 7C when the piston 9 is in the lower position, when the piston 9 is in the upper position, when the pump shaft 8 and / or dispensing head 4 is / are in the retracted position, and / or when the pump shaft 8 and / or dispensing head 4 is / are in the retracted position. Preferably, the (upper) seal 16, 16A bears in a sealing position against the side wall 6 or its inner surface 6A.

[0091] When the piston 9 is in the lower position and / or when the pump shaft 8 and / or discharge head 4 is / are in the retracted position, the vent opening 14 is preferably arranged between the upper seal 16A and the lower seal 16B. The seals 16A and 16B are in a sealing position against the side wall 6 and its inner surface 6A, respectively.

[0092] When the piston 9 is in the upper position and / or when the pump shaft 8 and / or discharge head 4 is / are in the extended position, both seals 16A, 16B are preferably arranged above the vent opening 14 and / or between the vent opening 14 and the upper section 7A and / or the space 7C. The seals 16A, 16B are in a sealing position against the side wall 6 and its inner surface 6A, respectively.

[0093] In particular, the ventilation opening 14 is arranged such that it is located below the lower seal 16, 16B in the upper position of the piston 9 or the extended position of the dispensing head 4.

[0094] The pump housing 5, in particular the side wall 6, and especially preferably its inner surface 6A, preferably has a ventilation channel 17. The ventilation channel 17 is preferably spaced apart from and / or separate from the ventilation opening 14. The ventilation channel 17 is preferably arranged above the ventilation opening 14. The ventilation channel 17 preferably extends at least substantially parallel to axis A.

[0095] VR26-4018-2 The ventilation channel 17 is shown in particular in Figures 3 to 6. Fig. 5 shows a section of the pump 1 or the pump housing 5, with the pump shaft 8 and the piston 9 omitted in order to clearly see the ventilation opening 14 and the ventilation channel 17.

[0096] The ventilation channel 17 is preferably formed by an unevenness 18 of the inner surface 6A, in particular between two preferably symmetrical sections 18A, 18B of an unevenness 18. The unevenness 18 or the sections 18A, 18B are preferably a projection or projections of the inner surface 6A.

[0097] In other words, the ventilation channel 17 is preferably formed as a channel between two protrusions on the inner surface 6A. This is particularly evident in Fig. 6, which shows a cross-section of the pump housing 5 or the side wall 6 perpendicular to axis A.

[0098] However, it is also possible that the unevenness 18 is a depression or that the ventilation channel 17 is formed by a depression in the inside 6A.

[0099] When the piston 9 is moved from the upper position to the lower position or vice versa, and / or when the pump shaft 8 and / or dispensing head 4 is moved from the extended position to the retracted position or vice versa, the piston 9 preferably moves past the ventilation channel 17 and / or sweeps over the ventilation channel 17. This particularly enables ventilation during movement of the piston 9, pump shaft 8 and / or dispensing head 4, or ventilation during a pumping operation.

[0100] In particular, at least one of the seals 16, especially the upper seal 16A, is moved over the vent channel 17 and / or the unevenness 18 during movement of the piston 9 between the upper and lower positions and / or during movement of the pump shaft 8 and / or discharge head 4 between the extended and retracted positions. This causes, in particular, a local lifting of the seal 16, 16A from the inner surface 6A or the opening of a passage between the seal 16, 16A and the inner surface 6A. In this way, air can enter the container 3 during the movement and / or pass from the upper section 7A or the space 7C to the vent opening 14 and from there, in particular, into the interior 3A of the container 3.

[0101] VR26-4018-2 Figures 3 and 4 show different positions of the piston 9 during its movement between the upper and lower positions, in which the upper seal 16, 16A is located at the level of the ventilation channel 17 and the ventilation opening 14 is located below the (upper) seal 16, 16A, above the (lower) seal 16, 16B and / or between the upper seal 16A and the lower seal 16B. In particular, one of Figures 3 and 4 represents the beginning of a ventilation process during a pumping operation or a movement of the piston 9, pump shaft 8 and / or piston 4, and the other of Figures 3 and 4 represents the end of this ventilation.

[0102] The ventilation channel 17 is preferably arranged such that it is located between the upper seal 16A and the lower seal 16B when the piston 9 is in the upper position or the dispensing head 4 is in the extended position, and / or that it is located above the upper seal 16A when the piston 9 is in the lower position or the dispensing head 4 is in the retracted position.

[0103] The dispensing head 4 is preferably lockable in the retracted position and / or in the extended position. Particularly preferably, the dispensing head 4 is lockable in both the retracted and extended positions. When the dispensing head 4 is locked, axial movement of the dispensing head 4 is preferably blocked. A locked state of the dispensing head 4 is therefore preferably a state in which the dispensing head 4 cannot be moved axially.

[0104] Preferably, the dispensing head 4 can be locked or moved into a locked state by means of a rotation about the axis A.

[0105] The pump 1 is actuated, in particular, by pressing down the discharge head 4 or by moving the discharge head 4 from the extended position, which is shown in particular in Fig. 1, to the retracted position, which is shown in particular in Fig. 2. Here, the pump shaft 8 preferably moves relative to the piston 9, in particular such that the displacement of the piston 9 relative to the pump shaft 8 releases a passage opening 8B of the pump shaft 8, which is arranged in particular near a lower end of the pump shaft 8, or opens the outlet valve 13, in particular as already explained above. In the extended position, the outlet valve is preferably

[0106] VR26-4018-213 closed or the passage opening 8B covered or sealed by means of the piston 9, in particular so that no fluid F can pass from the pump chamber 7 or its lower section 7A to the passage opening 8B or into an interior 8C of the pump shaft 8.

[0107] Thus, the fluid F can enter the interior 8C of the pump shaft 8 during its movement and be discharged from there via the discharge head 4. During the movement of the pump shaft 8, ventilation occurs in particular via the ventilation channel 17 and the ventilation opening 14, as explained above.

[0108] If, subsequently, particularly after the dispensing head 4 / pump shaft 8 has reached the retracted position and / or fluid F has been dispensed, the dispensing head 4 / pump shaft 8 preferably moves automatically back to the extended position, particularly due to the restoring force of the restoring device 15. In this process, the piston 9 preferably moves again over the through-opening 8B, so that the movement of the pump shaft 8 and / or piston 9 creates a negative pressure in the pump chamber 7 or the lower section 7B, which leads to the opening of the inlet valve 12 and the drawing in of fluid F from the interior 3A of the container 3 into the pump chamber 7 or the lower section 7B.

[0109] Individual features and aspects of the present invention can be implemented independently of one another, but also in any combination.

[0110] VR26-4018-2 Reference number list:

[0111] Pump 9 Piston Dispenser 10 Inlet Reservoir 11 Outlet Dispensing Head 12 Inlet Valve Pump Housing 13 Outlet Valve A upper end of 5 14 Venting Opening B lower end of 5 15 Reset Device Side Wall 16 Seal

[0112] A Inside of 6 16A (upper) seal Pump chamber 16B (lower) seal A upper section of 7 17 ventilation channel B lower section of 7 18 unevenness C gap 18A section of 18 pump shaft 18B section of 18 A (upper) end of 8 19 seal / sealing lip B passage opening of 8

[0113] C Interior of 8

[0114] D Outside of 8 A axis

[0115] E (lower) end of 8 F Fluid

[0116] VR26-4018-2

Claims

Patent claims:

1. Pump (1 ) for a dispenser (2) for dispensing a fluid (F), wherein the pump (1) has a pump housing (5) with an upper end (5A), a lower end (5B) and a preferably cylindrical side wall (6) between the upper end (5A) and the lower end (5B), wherein the pump housing (5) encloses a pump chamber (7), wherein the pump (1) has a piston (9) which is movable linearly along an axis (A) between an upper position and a lower position in the pump housing (5) or the pump chamber (7), wherein the pump chamber (7) is divided by the piston (9) into an upper section (7A) and a lower section (7B), wherein the upper section (7A) is arranged between the piston (9) and the upper end (5A) and the lower section (7B) is arranged between the piston (9) and the lower end (5B), wherein the side wall (6) of the pump housing (5) has a ventilation opening (14), characterized by that the pump (1), in particular the piston (9), has a seal (16, 16A) by means of which, at least in the lower position, the passage of fluid (F) from the vent opening into the upper section (7A) is prevented, and / or that the piston (9) has at least one seal (16, 16A) for sealing contact with the side wall (6), wherein the seal (16, 16A) seals against the side wall (6) at least in the lower position between the ventilation opening (14) and the upper section (7A), and / or that the piston (9) has an upper seal (16, 16A) for sealing contact with the side wall (6) and a lower seal (16, 16B) for sealing contact with the side wall (6), wherein in the lower position the ventilation opening (14) is located between the upper seal (16, 16A) and the lower seal (16, 16B) VR26-4018-2 is arranged and / or the upper seal (16, 16A) is arranged between the upper section (7A) and the ventilation opening (14).

2. Pump according to claim 1, characterized in that in both the lower position and the upper position, the passage of fluid (F) from the vent opening into the upper section (7A) is prevented.

3. Pump according to claim 1 or 2, characterized in that the seal (16, 16A) is in a sealing position between the ventilation opening (14) and the upper section (7A) on the side wall (6) in both the lower position and the upper position.

4. Pump according to one of the preceding claims, characterized in that in the upper position at least the upper seal (16, 16A) is arranged between the vent opening (14) and the upper section (7A).

5. Pump according to one of the preceding claims, characterized in that in the upper position the upper seal (16, 16A) and the lower seal (16, 16A) are arranged between the vent opening (14) and the upper section (7A).

6. Pump according to one of the preceding claims, characterized in that the vent opening (14) is arranged such that it is located below the lower seal (16, 16B) in the upper position of the piston (9).

7. Pump (1) for a dispenser (2) for dispensing a fluid (F), wherein the pump (1) has a pump housing (5) with an upper end (5A), a lower end (5B) and a preferably cylindrical side wall (6) between the upper end (5A) and the lower end (5B), wherein the pump housing (5) encloses a pump chamber (7), wherein the pump (1) has a pump shaft (8) partially arranged in the pump housing (5) or the pump chamber (7) and a discharge head (4) arranged outside the pump housing (5) at one end (8A) of the pump shaft (8), wherein the discharge head (4) and the pump shaft (8) are jointly linear VR26-4018-2 are movable along an axis (A) between an extended position and a retracted position, wherein the pump chamber (7) has a space (7C) arranged or formed radially between the side wall (6) and the pump shaft (8), wherein the side wall (6) of the pump housing (5) has a ventilation opening (14), characterized by that the pump (1) has a seal (16, 16A) by means of which, at least in the retracted position, preferably both in the retracted position and in the extended position, the passage of fluid (F) from the vent opening (14) into the space (7C) is prevented.

8. Pump according to claim 7, characterized in that the pump (1) is designed according to one of claims 1 to 6.

9. Pump according to one of the preceding claims, characterized in that the passage of fluid (F) from the vent opening (14) into the upper section (7A) or intermediate space (7C) by means of the seal (16, 16A) is prevented by the seal (16, 16A, 16B) sealingly against the side wall (6), in particular when the piston (9) is in the lower and / or upper position and / or when the pump shaft (8) or discharge head (4) is in the retracted and / or extended position.

10. Pump according to one of the preceding claims, characterized in that the side wall (6) has a ventilation channel (17) on its inside, in particular wherein the ventilation channel (17) is arranged such that when the piston (9) moves between the upper position and the lower position and / or when the discharge head (4) or pump shaft (8) moves between the extended position and the retracted position, the ventilation channel (17) is swept over by the piston (9) or the seal (16, 16A) or the piston (9) or the seal (16, 16A) is moved past the ventilation channel (17). VR26-4018-211. Pump according to claim 10, characterized in that the vent opening (14) and the vent channel (17) are arranged such that during a movement of the piston (9) between the upper position and the lower position and / or during a movement of the discharge head (4) or pump shaft (8) between the extended position and the retracted position, air can pass from the intermediate space (7C) or upper section (7A) through the vent channel (17) to the vent opening (14).

12. Pump according to claim 10 or 11, characterized in that the vent opening (14) and the vent channel (17) are arranged such that, during movement of the piston (9) between the upper and lower positions and / or movement of the discharge head (4) or pump shaft (8) between the extended and retracted positions, the vent opening (14) is located below the seal (16, 16A, 16B), in particular the upper seal (16A), and / or between the seals (16, 16A, 16B), and simultaneously the seal (16, 16A, 16B), in particular the upper seal (16A), is located in the area of ​​the vent channel (17), in particular wherein the inner side (6A) of the side wall (6) in the area of ​​the vent channel (17) is spaced apart from the seal (16, 16A, 16B) and / or so that air can pass through the vent channel. (17) and / or between the side wall (6) and the seal (16, 16A, 16B).

13. Pump according to one of claims 10 to 12, characterized in that air can pass from the vent opening (14) via the vent channel (17) past the piston (9) into the upper section (7A) or intermediate space (7C) when the seal (16, 16A, 16B) or upper seal (16A) is at the level of the vent channel (17).

14. Pump according to one of claims 10 to 13, characterized in that the ventilation channel (17) is formed by an unevenness (18, 18A, 18B) of the inside (6A) of the side wall (6) and / or that the ventilation channel (17) is formed between two projections (18A, 18B) of the inside (6A).

15. Pump according to one of the preceding claims, characterized in that the piston (9) is coupled to the pump shaft (8) and / or the discharge head (4), in particular wherein the piston (9) is arranged at an end of the pump shaft (8) opposite the discharge head (4). VR26-4018-216. Pump according to one of the preceding claims, characterized in that in the extended position of the discharge head (4) or pump shaft (8) the piston (9) is arranged in the upper position and / or that in the retracted position of the discharge head (4) or pump shaft (8) the piston (9) is arranged in the lower position.

17. Pump according to one of the preceding claims, characterized in that the piston (9) is movable relative to the pump shaft (8), in particular linearly along the axis (A).

18. Pump according to one of the preceding claims, characterized in that the piston (9) has two seals (16, 16A, 16B), in particular an upper seal (16A) and a lower seal (16B).

19. Pump according to one of the preceding claims, characterized in that the dispensing head (4) can be locked in the retracted position and / or in the extended position, so that in the locked state a movement of the dispensing head (4) along the axis (A) is blocked.

20. Pump according to one of the preceding claims, characterized in that the ventilation opening (14) is a particularly radial opening in the side wall (6).

21. Dispenser (2) for dispensing a fluid (F), wherein the dispenser (2) comprises a pump (1) designed according to one of the preceding claims. VR26-4018-2

Images