DISCHARGE HEAD FOR A METERING DISPENSER AND A METERING DISPENSER

Abstract

A metering dispenser for simultaneously or selectively discharging two media, including an outlet opening, a first reservoir for a first medium, a first metering-conveyor device for conveying the first medium from the first reservoir, a second reservoir for a second medium, a second metering-conveyor device for conveying the second medium from the second reservoir, a mixing chamber arranged upstream of the outlet opening and in which the first medium, conveyed by the first metering-conveyor device, and/or second medium, conveyed by the second metering-conveyor device, is stored temporarily, and an output-conveyor device for conveying the medium or media from the mixing chamber to the outlet opening. The first metering-conveyor device has the form of a metering-pump device with a variable-volume metering chamber, an inlet fluidically connected to the first reservoir and having an inlet valve, and an outlet fluidically connected to the mixing chamber and having an outlet valve.

Claims

1. A metering dispenser for the simultaneous or selective discharge of two fluid, gel-like or paste-like media comprising an outlet opening, a first storage chamber for storing a first medium, a first metering/conveying device for conveying the first medium from the first storage chamber, a second storage chamber for storing a second medium, a second metering/conveying device for conveying the second medium from the second storage chamber, a mixing chamber which is arranged upstream of the outlet opening, wherein the first medium which is conveyed by means of the first metering/conveying device and/or the second medium which is conveyed by means of the second metering/conveying device can be temporarily stored in the mixing chamber, and a discharge/conveying device for conveying the medium or the media from the mixing chamber to the outlet opening, wherein at least the first metering/conveying device is constructed as a metering/pump device comprising a metering chamber having a variable volume, an inlet which is connected in fluid terms to the first storage chamber and which has an inlet valve and an outlet which is connected in fluid terms to the mixing chamber and which has an outlet valve.

2. The metering dispenser as claimed in claim 1, wherein there is provided a discharge head which can be connected to the first storage chamber and the second storage chamber and which comprises at least the outlet opening, the first metering/conveying device which is constructed as a metering/pump device and the discharge/conveying device.

3. The metering dispenser as claimed in claim 2, wherein the discharge head comprises a housing which at least partially delimits the mixing chamber, the metering chamber of the metering/pump device and/or a first supply channel which is provided between the mixing chamber and the metering chamber.

4. The metering dispenser as claimed in claim 3, wherein the housing comprises a base plate and at least one peripheral wall which protrudes from the base plate and which at least partially delimits the mixing chamber or the metering chamber.

5. The metering dispenser as claimed in claim 1, wherein the metering/pump device has a piston which is adjustably supported in the metering chamber and which is adjustably supported in the axial direction of the metering dispenser, wherein the metering pump device further has an actuation handle by means of which the piston can be adjusted counter to the force of a restoring spring in order to reduce the volume of the metering chamber.

6. The metering dispenser as claimed in claim 5, wherein the inlet and the outlet of the metering/pump device are provided at an end of the metering chamber opposite the piston.

7. The metering dispenser as claimed in claim 1, wherein the inlet valve and the outlet valve are constructed as non-return valves.

8. The metering dispenser as claimed in claim 1, wherein the outlet has a channel piece which protrudes into the metering chamber and the inlet is provided on an annular channel which surrounds the channel piece.

9. The metering dispenser as claimed in claim 1, wherein the metering/pump device comprises a valve element which has the inlet valve and the outlet valve.

10. The metering dispenser as claimed in claim 1, wherein the mixing chamber has a variable volume, wherein the volume can be increased in a passive manner by incoming medium or incoming media and can be reduced by means of the discharge/conveying device in order to discharge the medium or the media.

11. The metering dispenser as claimed in claim 9, wherein the discharge conveying device has a piston which can be displaced in the mixing chamber and an outlet channel which is connected in fluid terms to the outlet opening, wherein the discharge conveying device preferably further has an actuation handle by which the piston can be adjusted in order to reduce the volume of the mixing chamber.

12. The metering dispenser as claimed in claim 11, wherein the outlet opening is provided on the actuation handle and the outlet channel extends through the piston.

13. The metering dispenser as claimed in claim 12, wherein a static mixing system for redirecting the flow is provided in the outlet channel.

14. The metering dispenser as claimed in claim 13, wherein the mixing system has a mandrel which protrudes into the outlet channel, wherein a helical path is provided on a wall of the outlet channel and/or a wall of the mandrel.

15. A discharge head for a metering dispenser as claimed in claim 1, having a first storage chamber for storing a first medium and a second storage chamber for storing a second medium, the discharge head comprising an outlet opening, a first metering/pump device for conveying the first medium from the first storage chamber, wherein the first metering/pump device has a metering chamber having a variable volume, an inlet having an inlet valve and an outlet having an outlet valve, a second metering/pump device for conveying the second medium from the second storage chamber, wherein the second metering/pump device has a metering chamber having a variable volume, an inlet having an inlet valve and an outlet having an outlet valve, a mixing chamber which is arranged upstream of the outlet opening, wherein the first medium which is conveyed by means of the first metering/pump device and/or the second medium which is conveyed by means of the second metering/pump device can be temporarily stored in the mixing chamber, and a discharge/conveying device for conveying the medium or the media from the mixing chamber to the outlet opening.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other advantages and aspects of the invention will be appreciated from the claims and from the following description of a preferred embodiment of the invention which is explained below with reference to the Figures. In the schematic drawings:

[0026] FIG. 1 is a perspective illustration of a metering dispenser;

[0027] FIG. 2 is a plan view of the metering dispenser according to FIG. 1;

[0028] FIG. 3 is a sectioned view of the metering dispenser along a plane of section III-III according to FIG. 2;

[0029] FIG. 4 is a sectioned view of the metering dispenser along a plane of section IV-IV according to FIG. 2; and

[0030] FIG. 5 shows a discharge head of the metering dispenser before a medium is discharged.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] FIGS. 1 to 5 are various views of a metering dispenser 1 for the simultaneous or selective discharge of two fluid, gel-like or paste-like media.

[0032] The metering dispenser 1 illustrated comprises a housing 10, a discharge head 11, a first storage chamber 12 for storing a first medium and a second storage chamber 13 for storing a second medium. In the embodiment illustrated, the storage chambers 12, 13 are produced in the housing 10, which to this end has the partition wall 14 which can be seen in the sectioned views according to FIGS. 3 and 4. For a discharge of the media, the metering dispenser 1 has an outlet opening 15.

[0033] The metering dispenser 1, more precisely the discharge head 11 thereof, comprises a first metering/conveying device which is constructed as a first metering/pump device 2 and a second metering/conveying device which is constructed as a second metering/pump device 3. The metering/pump devices 2, 3 each have a metering chamber 20, 30, a piston 21, 31 which is displaceably supported in the metering chamber 20, 30, a restoring spring 22, 32, an inlet 23, an outlet 24, 34 and an actuation handle 28, 38. The inlet 23 and the outlet 24 are arranged on the metering chambers 20, 30 at an end opposite the associated actuation handles 28, 38.

[0034] As can best be seen in the detailed view according to FIG. 5, an inlet valve 25 is associated in each case with the inlet 23 and an outlet valve 26 is associated in each case with the outlet 24. In the embodiment illustrated, the inlet valve 25 and the outlet valve 26 are produced as a common component, which is supported by means of a sleeve-like bearing element 27 on a channel piece 29 which protrudes into the metering chambers 20, 30. The channel piece 29 delimits an outlet 24 which is located at the inner side of the channel piece 29. An associated inlet 23 is provided in an annular channel formed between a wall 112 of the metering chamber 20 and the channel piece 29.

[0035] The outlets 24, 34 are connected in fluid terms to a mixing chamber 40 by means of two supply channels 5, wherein in the views illustrated only one supply channel 5 can be seen. The mixing chamber 40 illustrated has a variable volume, wherein the volume can be increased in a passive manner by means of incoming medium or media, as illustrated schematically in FIGS. 4 and 5. FIG. 4 shows in this instance the metering dispenser 1 after a medium discharge or before initial operation. FIG. 5 shows the discharge head 11 of the metering dispenser 1 after a medium or a plurality of media have been conveyed into the mixing chamber 40 with the volume being increased.

[0036] The metering dispenser 1 further comprises a discharge/conveying device 4 having a piston 41 and an actuation handle 48 for conveying the medium or the media from the mixing chamber 40 to the outlet opening 15. The mixing chamber 40 has one or two inlet(s) 43 which is/are opposite the actuation handle 48 and in which the supply channels 5 open. A medium is conveyed with a displacement of the piston 41 from the mixing chamber 40 via an outlet channel 44 to the outlet opening 15. The outlet channel 44 comprises in the embodiment illustrated a first channel portion which extends in the actuation direction through the piston 41 and the actuation handle 48 and a second channel portion which extends radially relative to the actuation direction through the actuation handle 48, wherein the outlet opening 15 is provided at a free end of the second channel portion on the actuation handle 48. A corresponding arrangement has been found to be advantageous for dispensing viscous products onto a hand of a user. However, other embodiments are also conceivable.

[0037] The discharge/conveying device 4 illustrated further has a static mixing system 49 which is constructed as a helical spindle. The mixing system 49 illustrated comprises a mandrel 490 which is arranged in a fixed manner on the housing of the discharge head 11 and which protrudes into the outlet channel 44, wherein in the region of the piston 41 a helical path 491, for example, in the form of an inner thread, is incorporated in a covering face of the outlet channel 44. Alternatively, it is conceivable for the mandrel 490 to be constructed as a spindle-like journal. In yet other embodiments, no mixing system is provided.

[0038] In the embodiment illustrated, the discharge head 11 comprises a housing 110 which is produced, for example, as an injection-molded component and which has a base plate 111 and three peripheral walls 112, 113, 114, which protrude from the base plate 111. The three walls 112, 113, 114 delimit in a peripheral direction the metering chambers 20, 30 and the mixing chamber 40. The mandrel 490 of the mixing system 49 and the channel piece 29 are also formed by means of portions of the housing 110 protruding from the base plate 111. An assembly of the additional components of the metering/pump devices 2, 3 and/or the discharge conveying device 4 is possible in a simple manner via an open end of the walls 112, 113, 114 opposite the base plate 111. In the embodiment illustrated, there are further provided on the housing 111 peripheral walls 115 which surround the restoring springs 22, 32 and which protrude concentrically relative to the walls 112, 113 of the metering chambers 20, 30 from the base plate 111. The housing 110 is closed by means of a cover 12, wherein the housing 110 has an annular web 116 for assembly of the cover 12.

[0039] At a lower side of the base plate 111 opposite the walls 112, 113, 114 there are provided grooves which delimit the supply channels 5. The supply channels 5 are closed by the housing 10 of the storage containers 12, 13.

[0040] For a discharge, the first metering/pump device 2 and/or the second metering/pump device 3 are first actuated. To this end, a force is applied to the actuation handle 28, 38 of the respective metering/pump device 2, 3 and, by means of the actuation handle 28, 38, the piston 21, 31 is moved counter to the force of the restoring spring 22, 32 so that a volume of the metering chamber 20, 30 of the metering/pump device 2, 3 is reduced. In the metering chamber 20, 30 air which is present in the delivery state or a product which is located therein is displaced. The inlet valves 25 are constructed in such a manner that they remain closed in spite of the increasing pressure in the associated metering chamber 20, 30. The outlet valves 26 are in contrast constructed in such a manner that they open as a result of the increasing pressure in the associated metering chamber 20, 30 so that the air which is displaced as a result of the reduction of the volume or the displaced product is conveyed via the supply channel 5 into the mixing chamber 40. In this instance, as a result of the incoming product, the piston 41 is moved upwards out of the lower rest position illustrated in FIG. 4.

[0041] When the force which is applied to the actuation handle 28, 38 of the first metering/pump device 2 and/or the second metering/pump device 3 is discontinued, the piston 21, 31 of the first metering/pump device 2 and/or the second metering/pump device 3 as a result of the restoring force of the restoring spring 22, 32 is moved into the initial position illustrated in FIG. 4 again. The outlet valves 26 are configured in such a manner that they remain closed in spite of a suction action in the associated metering chamber 20, 30 in the event of a backward movement. The associated inlet valve 25 is in contrast opened as a result of the suction action so that the product is conveyed out of the storage chamber 12, 13 which is connected in fluid terms into the metering chamber 20, 30.

[0042] This operation can be repeated if necessary until a maximum filling volume of the mixing chamber 40 is reached and/or until a desired quantity of product has been conveyed.

[0043] A discharge of the media which are temporarily stored in the mixing chamber 40 is carried out by means of a subsequent actuation of the discharge/conveying device 4. By applying a force to the actuation handle 48 of the discharge/conveying device 4, the actuation handle 48 is moved with the piston 41 so that the product is conveyed from the pump chamber 40 to the outlet channel 44. In this instance, the outlet valves 26 of the metering/pump devices 2, 3 prevent the medium or the media from being conveyed back into the metering chambers 20, 30. If two media have been conveyed by means of the two metering/pump devices 2, 3 into the mixing chamber 40, they are mixed during discharge. In the metering/pump devices 2, 3 and in the storage chambers 12, 13 the media are in contrast reliably separated from each other.

[0044] The mixing chamber 40 of the discharge/conveying device 4 is at least almost completely emptied by the actuation. After the actuation, the actuation handle 48 of the discharge/conveying device 4 remains in the lower rest position illustrated in FIG. 4. Only in the event of repeated conveying of the medium or the media into the mixing chamber 40 by means of actuation of the metering/pump devices 2, 3 is the actuation handle 48 moved with the piston 41 with the volume of the mixing chamber 40 being increased.

[0045] For a movement of the pistons 21, 31 of the metering/pump devices 2, 3 counter to the force of the restoring springs 22, 32, in the embodiment illustrated two actuation handles 28, 38 which can be used separately from each other are provided. In other embodiments, a common actuation handle is provided for both metering/pump devices 2, 3. In one embodiment, a metering stroke which can be brought about by the common actuation handle can be adjusted differently for the two metering/pump devices 2, 3 by means of suitably constructed actuation means in this instance.