CA1108358A

CA1108358A - Dispenser device

Info

Publication number: CA1108358A
Application number: CA279,357A
Authority: CA
Inventors: Walter Meyer; Anton J. Bara
Original assignee: Trisa Buerstenfabrik AG Triengen
Current assignee: Trisa Buerstenfabrik AG Triengen
Priority date: 1976-06-08
Filing date: 1977-05-27
Publication date: 1981-09-08
Also published as: SU1041042A3; DD131617A5; ES459155A1; JPS5757344B2; FI771729A; SE439726B; CS209439B2; NO146799C; IL52153A; NO146799L; SE7706443L; ATA386577A; US4236651A; AU505429B2; BR7605205A; PT66549B; US4068974A; NO146799B; GR63214B; PT66549A

Abstract

ABSTRACT OF THE DISCLOSURE

A dispenser device comprising a reservoir for a flowable or fluent filled material as well as a piston pump equipped with a valve arrangement. The valve arrangement is coaxially dispositioned with regard to the pump and possesses parts connected with the piston and parts connected with the cylinder of the piston pump.

Description

BACKGROUND OF T~IE _NVENTION
The yresent invention relates to a new and improved constmction of dispenser device of the type comprising a reservoir for a fluent or flow-able filled material i.e. a material which is to be dispensed as well as containing a piston pump equipped with a valve arrangement.
Dispenser devices of this type are known to the art in numerous constructional embodiments. They are typically quite complicated in con-struction and accordingly expensive. Furthermore, they simultaneously markedly inhibit the free construction or design of the apparatus with which such dispenser devices are employed. Thus, it is for instance difficult to construct the reservoir as a cartridge, since for the purpose of connecting the same with the pump there is required a detachable conduit connection.
Moreover, the valve arrangement of the state~of-the-art dispenser devices employ automatically activated or even better stated pressure-activated valves, since the positive actuation of the valves requires a complicated valve mechanism which cannot really be employed already for spatial, cost or also fuDctlonal reasons.

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The present invention provides a dispenser device for dosed dispensing of a fluent material, comprising:- a reservoir containing the fluent material, a piston pump having a cylinder part and a piston part which are movable relative to one another, a valve arrangement having an inlet valve and an outlet valve, one valve of which being arranged in the piston part and the other valve being arranged in the cyli.nder part, each valve having a closure member the two closure members being connected with one another by a valve stem for common ackuation in ~he same direction, and forming a valve body, each closure member coacting with a valve seat arranged at the cylinder part and the piston par~, respectively, said valve body being slidably coupled with the pump part provided with the outlet valve, spring means arranged between the closure member of the inlet valve and the pump part provided with the outlet valve and bearing at one end against said closure member, and at the other end against said pump part, said spring means being unsupported between its ends and in the rest condition of the piston pump, maintaining said outlet valve closed, and being loaded only after closing of the inlet valve to keep the latter closed, and resilient return means acting between ~he cylinder part and the piston part, said return means being loaded during the delivery stroke of the ~ 20 piston pùmp and causing a relative movement between the pump parts during the suction stroke of the pump.

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33~8 The invention also provides a brush, in particular a toothbrush, having a bristle carrier carrying a bristle set and having a dispenser device for dosed dispensing of a fluent material as a~oresaid.
With such construction the abrication of the dispenser device is particularly simple, since the aforementioned parts of the valve arrange-ment c~m be already formed by appropriate construction of the pump parts or components.
; Fur~hermore, the relative movement of the pump parts can be designed such that they can be accomplished practically without any additional complications concerning the positive valve actuation. In addition to the functional reliability which is ob~ained there is also ~;
increased the dosing accuracy and the dispensing action can he rendered extensively independent of the viscosity of the filLed materîal. Further-more, the reservoir can be readily constructed as a cartridge~ since with the previously discuss0d construction the piston pump and the pump cylinder can form a detachable conduit `' ' .
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83~i8 connection which is situated between the inlet and the outlet of the valve arrangement~ This allows installing the cartridge in the handle of the related device and to use such as the actual actuation element bokh for the pump as well as also for the valve arrangement.
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The foregoing design provides a dispenser device which is constructed exceedingly simply, but however, exhibits maximum functional integrity or reliability, and this is so even to the extent that there is prevented in any event any undesired flowing out of the material to be dispensed, but the dispensing thereof however is ensured for in a reliable mannex and with the desired dosage. In particular, the one pump part or component can be e~uipped with a valve body which can be displaced against sprlng force. At the end of the pumping stroke ;
this valve body closes off an opening conn~cting the cylinder chamber or space with the reservoir and again frees such opening during the return stroke of the pump, so that even relatively viscous filled material can easily be delivered into the cylinder compartment. The relevant pump part or component which is equipped with the valve body furthermore can support the one part or component of the outlet valve, for instance, the seat of such outlet valve, against which there sealingly comes to bear an associat~d valve head during the return stroke of the piston. During the forward stroke of the relevant pump part the :~
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valve head is lifted from its seat b~v the valve body and the outlet from the cylinder compartment is completely freed.

The fields of application of such dispensing device are numerous. In order to more fully explain the different ~;
details thereof there will be considered hereinafter, only by way of illustration and not limitation, a toothbrush equipped with the previously described dispenser device of the invention and an appropriately constructed spray can.
': ' : BRIEF DE~SCRIPTION OF q~E DRAWINGS

The invention will be better understood and objects other than those set forth above, will become apparent when con-sideration is given to the following detailed description thereof. Such description makes reference to the annexed drawings wherein:

Figure 1 is an axial sectional view of a preferred embodiment of ountain toothbrush equipped with a bristle carrier having a handle and a replaceable cartridge not integral there-with and serving as a reservoir;
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Figure 2 is a cross-sectional view through th~

cartridge ~d tle gu.de sleeve surrourding it shown ln Pigure 1, 13~ ~

-taXen substantially along the line II-II thereof;

Figure 3 is a perspective view of the cartridge shown in Figure 1;

Figure 4 is an enlarged axial sectional view of the zone of the toothbrush in which the bristle carrier and the cartridge engage one another, wherein the cartridge i5 in a position in which it protrudes from the open end of the handle part of the bristle carrier;
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Figure 5 illustrates a similar axial sectional view as shown in Figure 4, but with the cartridge urged into the :
handle part of the bristle carrier;
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Flgure 6 is a perspective partial view of another exemplary embodiment of the conduit member provided in the bristle carrier;

Figure 7 is an axial sectional view of a~part of . the piston having inserted therein a part of the embodiment of : a conduit element as shown in Figure 6;
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: Figure 8 is an axial sectional view of a spray can :~
employing e teachings of the invention; and _ 7 _ ~
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~igure 9 is a modified version of spray can utilizing the inventive teachings.

DETAILED DESCRIPTION OF T~E PREFERRED E~BODIMENI'S
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Descxibing now the drawings, the exemplary embodi-ment,of dispenser device shown by way of example as a fountain -toothbrush in Figures 1 and 2 will be seen to comprise as its main parts or components a bristle carrier 3 which carries at its one forward end a set of bristles 4. This bristle carrier or support 3 possesses about the face or end surface 3a which faces away from the end caxrying the bristles 4 an extension in the form of a rigid-walled sleeve 5 which simultaneously serves as a handgrip or handle and is open at its rear end 5a. A cartridge 10 containing the filled material i.e. the material which is to be dispensed, in this case a liquid ox pasty dentifrice is inserted through the open handle end 5a. ¦
A duct or passageway 2 extends through the bristle carrier 3 from its rear end face 3a up to the region of the bristle-carryin end of such bristle caxrier 3 and opens by means of a lateral outlet channel or duct 2a between the bristles 4. Moreover, the cross-section or diameter of the duct or passageway 2 is structured at one location preferably in such a manner that it exerts a capillary accion on the dentifrice flowing therethrou~ ~h ~ 8 ~

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:- ~ 3~ 3 depending upon the vi.scosity of the latter. By ~irtue of these measures there is extensively avoided unintentional flow of dentifrice out of the outlet opening of the outlet duct or channel 2a when the dispenser device, in this case the fountain toothbrush, is in its non-actuating position~even when the fountain toothbrush is held with the bristles 4 pointing down-wards and is shaken or jarred or fllmg about.

A piston 7 having an axial passage or passageway 17 is pressed with a tight fit into the widened end region or throughflow end 2b of the duct or passageway 2. The dentifrice-containing cartridge 10 is inserted in the sleeve 5 forming the handle and possesses at its end wall lOb directed towards the interior of the sleeve 5 a throughflow chamber or a cylinder sleeve part or connection 8. The cylinder sleeve part or con-nection 8 has an internal chamber or passage 9 which flow communicates with the internal space or chamber lOa of the cartridge 10 by means of an opening 11. The cylinder sleeve part 8 is arranged in the inner end wall lOb of the cartridge 10 in such a manner, and its diameter is designed such,.that upon insertion of the cartridge 10 the piston 7 enters the cylinder ..
sleeve part 8 and can seallngly slide therein. ~he cylinder sleev part or connection 8 thus forms a p~p cylinder which is associated with the piston 7. Prior to its insertion into the sleeve 5, a new, dentifrice-filled cartridge 10: i5 sealed .

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b~ a membrane-like closure llb across the opening 11~ as best ::
seen by referring to Figure 3. The path of inserti.on of the cartridge 10 is limited by a nose or nose member lOc provided on the outer cartridge wall, this nose member being snapped into a groove or recess 5b of the wall of this sleeve 5, and also is limited by impact of the nose lOc against the end wall of the groove 5b which is displaced forwards in axial direction, i.e. towards the bristles 4.

A recess 13 provided in a part of the rear end wall 3a of the bristle carrier 3 and located internally of the sleeve 5 defining the handle and anothex recess 14 provided at an oppositely situated front end wall lOb of the cartridge 10 facing towards the brlstles4 a~ alignedwith one another and re-ceive therein, respectively, the opposite ends of a compression spring 15 which serves as a return spring for urging the bristle carrier 3 and the cartridgs 10 asunder. The displacement of the cartridge 10, due to the action of the compression spring 15, outwardly of the open rear end of the sleeve 5 is limited by the abutment of nose lOc of the cartridge 10 against the -transverse rear end wall of the groove Sb. Consequently, cartridge 10 is prevented from dropping out of the handle formed by the sleeve 5. On the other hand, when pulling more intensely on the rear end of the cartridge 10 protrudin~ from the open end of the sleev~

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5, the somewhat flexible nose lOc can be forced to slip out of the groove 5b, and thus for instance it is possible to remove an empty cartridge from the sleeve 5 and to replace the same by a new, full cartridge. Instead of constructing the nose lOc to be flexible or resilient, it is equally possible to also design the wall of the cartridge lO to be somewhat flexible or resilient, especially in the vicinity of the nose lOc in order to serve the same purpose.

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Now if instead of the groove 5b there is provided a window as shown in Figure 1, then the nose lOc can be pressed slightly inwardly e.g. with a fingertip and at the same time can be disengaged or dislodged from the groove 5b by simply pushing it outwardly, whereupon the cartridge lO can be easily pulled out of the sleeve 5. For this purpose, the windo~ 5b also can be located near the other end of the sleeve 5 e.g. towards its centxal or middle region. A pin 19 which projects outward of the end face or side 7a of the piston 7 which is located opposite the cartridge lO serves to rupture the previously discussed cartridge membrane lla when the cartridge lO is inserted far enough into the sleeve 5. Pre~erably this occurs at the same time as the nose lOc snaps into the groove or window 5b, or however shortly beforehand.

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~835~3 During the manufacture of the bristle carrier 3 together with the sleeve 5 of the previously described fountain toothbrush, difficulties are associated with the manufacture of the narrow, long duct or passageway 2, because the required long, thin cord needle used during injection mo.l.ding can easily break or become bent. Hence, the passageway or duct

2 is manufac~ured of a larger diameter than is desirable fcr a controlled outflow of the material to be dispensed, here the dentifrice. Thus, in the wide passageway or duct 2 there can be fixedly inserted a conduit element 32, preferably in the form of a hollow needle having a narrow axial channel 33 there-through. In the widened region or zone 2b of the passageway or duct 2 which is situated towards the bristle carrier-end wall 3a there is fixedly seated or otherwise fixedly connected, upon the end 32a of the conduit element 32 which protrudes out ~:
of the region.2b of such duct 2, the open end 7c of the piston 7 which confronts the bristle carrier 3.
~ : , : At the end surface or face 7a confronting the : cartridge lO the piston 7 is equipped with a circumferential ~ elastic seal1ng rim or edge 7b. This sealing rim or edge 7b :~ sealingly bears against and is guided at the inner wall 8a of .. the cylinder chamber 9 of the cylinder sleeve part or connection ~.

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The axial piston passage 17 which extends through the piston 7 opens at one end at the center of the piston end or frontal face 7a and is provided at the middle or central zone of the piston 7 with a con.icall~ bevelled ring or stepped shoulder 16. This ring shoulder 16 serves as a valve seat and merges with the throughpassage region or passage zone 17b of wider diameter, and which zone extends from the ring shoulder 16 to the pass~ge opening or throughpassage opening 17a facing ~:
towards the bristles 4.

In the throughpassage 17 ~here is housed a valve bodv 18 possessing a sealing portion 18a of larger diameter and a sealing disc or gasket 20. The latter can sealingly bear at the inner surace of the transverse wall lla separatiny the interior of the cylinder chamber 9 from the interior lOa of the reservoir in the cartridge 10, thereby obturating the opening 11 ].ocated in such transversewall lla. At the abutting :~
or sealing disc 20 there is provided pin 1.9 which protrudes into the opening 11 and by means of the latter into the interior or inner space lOa of the cartridge 10. The diameter of the pin 19 is slightlv smaller than that of the opening 11. ~::
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: The underside 18b of the sealing ring portion 18a, ~:~

: which underside confronts the bristles 4, can be brought into.

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abutting contact with the end face or wall 7a of the piston 7 and carries a valve stem 21 which protrudes into the piston passa~e 17 past the valve seat 16 in the direction of the bristle~s 4. The valve s~em 21 isenlarged at its one end in the form of a head 22 and possesses a-t the side of the head which faces away from its end a preferably conlcally bevelled valve sealing surface or face 22a. The latter is constructed such that it can sealingl~ bear upon the valve seat 16.
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: The spacing between the contact surface of the : abutting sealing disc 20 at the opening 11 and the valve sealing surface 22a of the head 22 of the valve body 18, on the one handr and the spacing between the end surface 7a and .~ the valve seat 16, on the other hand, are dimensioned such that when the piston 7 sealingly bears with its end wall or ~ face 7a at the underside 18b of the sealing ring portion or part ;.: 18a and, when the outer face or surface of the abutting sealing disc 20 sealinglybears at the transverse wall l].a of the cylinder sleeve part or cylinder chamber 8, and which transverse wall lla contains the opening 1~ the valve head 22 is lifted from ., . the valve seat 16. This occurs against the force of a valve resetting spring 23 which is arranged between the underside of the abutting sealing disc 20 directed towards the piston 7 . and the end wall 7a of the piston 7 and strives to sealingly . .

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~ press the valve head 22 ayainst the valve seat 16.
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In lieu of a single central -throughflow channel 33 there can be provided in the outer wall of the conduit element 32 also two or moxe, :Eor instance four longitudinal grooves 33a, as best seen by referring to ~igures 6 and 7. In the end region 32a of the conduit element 32 these longitudinal grooves 33a are covered by the inner wall of the passage 17 .in the open end region 7c o the p.iston 7 and downstre~n thereof are covered by the inner wall of the duct or passageway 2 in the bristle carrier 3 and~ thus, form a multiplicity of through~
flow channels whose individual cross-sectional areas can be held so small by providing correspondingly flatter or narrower :~
cross-sections of the grooves 33a that they strive to carry out a desired capillary effect on the liquid dentifrice.
~ -Having now had the benefit of the foregoing ~ description of the exemplary embodiment of dispensin~ or - dispenser unit in the fonn of a fountain toothbrush the same is used in practice in the following manner:.
. ~' Initially during introduction of the cartridge 10 into the handle formed by the sleeve 5, while piercing the membrane llb closing the opening 11 by means of the pin 19 .

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which is held in position relative to the cartridge 10 owing to the abutment of the sealing part 18a at the base portion 7a of the piston ~, the bristle carrier 3 and the cartridge 10 assume the position depicted in Figure 5. In this position the abutting gasket disc 10 closes the opening 11 against which it has already been pressed approximately prior to reaching the position of Figure 5 by means of the compressed valve ~:
compression spring 23. Now if under the action of the stronger return or restoring spring 15 the cartridge 10 is moved wi-thin the sleeve 5 away from the end suxface or face 3a of the bristle carrier 3, then such cartridge also moves relative to the piston 7 which thus sea.Lingly bears in contact with the sealing rim .
7b at the inner wall 8a of the cylinder chamber 9 until it has reached the position shown in Figure 4. During this movement the abutting gasket disc 20 initially still retains the opening 11 closed in that the spring 23 is not completely untensioned, even when the valve head 22 has already reached ,, the valve seat 16.
' l During further displacement of the cartridge 10 by ~. thecompression spring 15 the valve body 18 is fixedly held :: by means of-the valve sealing surface 22a at the valve seat 16 and the sealing disc 20 frees the opening 11. Consequently, :~
when the toothbrush is held with the bristles 4 directed down waxd even a viscous dentifrice or other material to be dispensed ~ ~'1:3~3~ ~

will be suctioned into the pumping space defined by the cylinder ch~nber 9. Any air whi.ch is present in the pumping space of the cylinder chamber 9 ascends in the form of bubbles to the outer, upper end lOa of the cartridge 10 (Figure 4)~

Now if duriny application of pressure upon the pro-truding end lOa of the cartridge 10 the piston 7 is again shifted in the cylinder chamber 9 into the position shown in Figure 5, then initially the opening 11 is closed due to abutment of the abutting disc 20 and then during the further course of the cartridge- and piston movement, respectively, the spring 23 is com pressed and thus the valve seat 16 is moved away from the valve head 22. During progressive penetration of the piston 17 into the pumping or cylinder chamber 9 liquid is expressed between the valve seat 16 and the valve head 22 and pressed into the through~
flow channel 33 until the end face or wall 7a abuts against the underside or stepped portion 18b of the ring-shaped or annular part 18a.

Upon release of the cartridge the cylinder chamber forming sleeve part 8 and the piston 7 again return from the position shown in Figure 5 back into the position shown in Figure 4 and the fountain toothbrush is again ready for dispensing a new dose of li~uid dentifrice to the bristles 4.
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A fountain toothbrush having a piston part introducibl~
lnto a rigid-walled rearwardly closed reservoir and a valve mounted in the frontal wall of the piston part has been described in United States patellt 3,227,165 to Constanza. However, with this prior art fountain toothbrush~ the valve consists of a slotted rubber valve which does not allow for any dosed dispensing of the liquid dentifrice to the bristles.
~' Good closure oP the opening ll of the cartridge 10 is of decisive importance for the positive functioning, especially also for the exact dosed delivery of liquid for the fountain toothbrush of the prasent invention. To this end there is required a sufficiently strong spring 23 and a sufficient ly narrow intermediate space between the valve stem 21 and the inner wall 17b of the axial piston passage 17.

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In order to demonstrate the manifold possible fields of application of the described dispenser device, there will hereinafter be considered a number of other applications.
The handle of the illustrated fountain toothbrush wit.h the valve arranyement housed therein and the cartridge can be used, for instance, directly as the bristle carrier for a hand brush or the like. Such handle or handgrip furthermore could possess a particular aesthetic construction, wherein the cartridge can conta n cosmetics or the like. In the same manner it is however also ~ 11LfD8~S~I ~

possible to use the dispenser device for the dispensing of medication, by virtue of the dosage accuracy. The particular characteristics or aspects of the invention come fully into play especially when using the same in the environment of a fountain toothbrush, since such device often is carried in a pocket book or the pocket of a jacket or the like, so that there'must be present both positive operational reliability in conjunction with absolute lac~ of leakage of the material to be dispensed. It has been found in practice that in the case of a fountain toothbrush, as previously described, these requirements are totally fulfilled.

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What has been explained heretofore is analagously applicable with regard to the embodiments of spray cans shown in Figures 8 and 9. As a matter of simplicity the same or slightly modified reference characters have been conveniently employed for the same components, so that further detailed explanations are not believed to be necessary beyond what is stated hereinafter. The pump isaccommodated in a container cap or closure 50 which is attached at the reservoir or cartridge, possibly so as to be exchangeable. The piston 7 engages by means of its piston rod 60 into an actuation part or component 51. A hose 53 merges with the opening 11.
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83~i8 ' With the embodiment of Figure 9 the closure 50 is provided at the end o the cartridge or reservoir 10 which faces away from the actuation part ~1. Instead of using the hose 53, : in this case there are provided the connection channels 53a~
The piston 7 is connected with the actuation part by means of a tube 54.
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The narrow passage moreover forms an especially .
effective throttle location or throttle means~ also upon release of the cartridge, and which prevenks sucking-up of undesirable amounts of air. The negative pressure which prevails in the cylinder compartment due to the throttling action can bring about lifting o~ the valve plate or sealing disc 20 from its seat before the valve head 22 will be seated upon its seat 16.

. While there are shown and described present preferred embodiments of the invention~ it is to be distinc~ly understood that the invention is not limited thereto, but may be--otherwise variously embodied and practiced within th~ scope of the following clalms. ~~ ~ ~ ~ --~-~- -::
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Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A dispenser device for dosed dispensing of a fluent material, comprising:- a reservoir containing the fluent material, a piston pump having a cylinder part and a piston part which are movable relative to one another, a valve arrangement having an inlet valve and an outlet valve, one valve of which being arranged in the piston part and the other valve being arranged in the cylinder part, each valve having a closure member the two closure members being connected with one another by a valve stem for common actuation in the same direction, and forming a valve body, each closure member coacting with a valve seat arranged at the cylinder part and the piston part, respectively, said valve body being slidably coupled with the pump part provided with the outlet valve, spring means arranged between the closure member of the inlet valve and the pump part provided with the outlet valve and bearing at one end against said closure member, and at the other end against said pump part, said spring means being unsupported be-tween its ends and in the rest condition of the piston pump, maintaining said outlet valve closed, and being loaded only after closing of the inlet valve to keep the latter closed, and resilient return means acting between the cylinder part and the piston part, said return means being loaded during the delivery stroke of the piston pump and causing a relative movement be-tween the pump parts during the suction stroke of the pump.

2. The dispenser device according to claim 1, characterized in that the reservoir has an outlet opening forming the valve seat of the inlet valve.

3. The dispenser device according to claim 2, characterized in that the cylinder part of the piston pump is connected with the reservoir and has a cylinder chamber connected with said outlet opening and that the valve body is coupled with the piston part of the piston pump and displaceable relative thereto against the pressure of said spring means.

4. The dispenser device according to claim 1, characterized in that the valve body is limited in its movement against said spring means by stops.

5. The dispenser device according to claim 4, characterized in that the stops are formed by a shoulder of the valve body and by the base of the piston part.

6. The dispenser device according to claim 3, characterized in that the cylinder part is formed by a connection surrounding the opening and which connection is attached at the reservoir.

7. The dispenser device according to claim 2, characterized in that the piston part is provided with an axial passageway provided with the valve seat and into which axial passageway extends the valve stem.

8. The dispenser device as defined in claim 7, characterized in that the valve seat and/or the closure member of the outlet valve are elastically deformable so that the closure element can be inserted through the valve seat.

9. The dispenser device according to claim 3, characterized in that a throttle location is provided between the outlet valve and the cylinder chamber.

10. A dispenser device according to claim 1, characterized in that the reservoir is constructed as an exchangable cartridge.

11. The dispenser device according to claim 3, characterized in that the outlet opening of the reservoir is closed by a releasable closure element.

12. The dispenser device according to claim 11, characterized in that the valve body has a mandrel pin confronting the opening.

13. A brush, in particular a toothbrush, having a bristle carrier carrying a bristle set and having a dispenser device according to claim 1.

14. The brush according to claim 13, characterized in that the reservoir has an outlet opening forming the valve seat of the inlet valve.

15. The brush according to claim 13, characterized in that the cylinder part of the piston pump is connected with the reservoir and has a cylinder chamber connected with said outlet opening and that the valve body is coupled with the piston part of the piston pump and displaceable relative thereto against the pressure of said spring means.

16. The brush according to claim 13, characterized in that the valve body is limited in its movement against the spring means by stops.

17. The brush according to claim 16, characterized in that the stops are formed by a shoulder of the valve body and by the base of the piston part.

18. The brush according to claim 15, characterized in that the cylinder part is formed by a connection surrounding the opening and which connection is attached at the reservoir.

19. The brush according to claim 14, characterized in that the piston part is provided with an axial passageway provided with the valve seat and into which axial passageway extends the valve stem.

20. The brush as defined in claim 19, characterized in that the valve seat and/or the closure member of the outlet valve are elastically deformable so that the closure element can be inserted through the valve seat.

21. The brush according to claim 15, characterized in that a throttle location is provided between the outlet valve and the cylinder chamber.

22. A brush according to claim 13, characterized in that the reservoir is constructed as an exchangable cartridge.

23. The brush according to claim 15, characterized in that the outlet opening of the reservoir is closed by a releasable closure element.

24. The brush according to claim 23, characterized in that the valve body has a mandrel pin confronting the opening.