EP3079834A1

EP3079834A1 - Dispenser

Info

Publication number: EP3079834A1
Application number: EP14824387.6A
Authority: EP
Inventors: Sabine Göttke
Original assignee: RPC Bramlage GmbH
Current assignee: RPC Bramlage GmbH
Priority date: 2013-12-10
Filing date: 2014-12-10
Publication date: 2016-10-19
Anticipated expiration: 2034-12-10
Also published as: US20160325297A1; ES2674376T3; EP3079834B1; BR112016013315A2; RU2016127584A; DE102013113791A1; CN105934281A; US10086395B2; RU2683116C1; WO2015086664A1; CN105934281B

Abstract

The invention relates to a dispenser (1) for dispensing compounds with a liquid to pasty consistency, comprising a dispenser head (2) which is movable in order to dispense compound (M), a reservoir (3) and a pump chamber (4) having an inlet valve (11) and an outlet valve (12), wherein a dispensing opening (5) is formed in the dispenser head (2) and a closure piston (6) is provided for closing or exposing the dispensing opening (5), said closure piston being movable in the direction of its longitudinal axis (L) and having a distal end assigned to the dispensing opening and a proximal end and being arranged in a compound chamber (9) of the dispenser head, wherein furthermore a connecting section (10) from the pump chamber (4) to the compound chamber (9) opens into the compound chamber (9) between the distal and proximal end of the closure piston (6), which connecting section has a central axis (A). In order to configure such a dispenser favourably with regard to initiating the dispensing operation, according to the invention the outlet valve of the pump chamber is rigidly coupled to the dispenser head (2) and, upon actuation in a first movement section of the dispenser head, in which an exposing of the closure opening (5) already takes place, a movement into the open position takes place, for example the outlet valve (12) moves into the pump chamber (4) without this leading in any way to a significant reduction in size of the pump chamber (4).

Description

donor

The invention relates to a dispenser for dispensing liquid to pasty masses, having a dispenser head movable for dispensing the mass against spring force, a storage chamber and a pumping chamber having an inlet valve and an outlet valve, wherein a dispensing opening is formed in the dispenser head and for closing or releasing the dispensing opening a closure piston which is movable in the direction of its longitudinal axis and has a distal end and a proximal end and is arranged in a fluid chamber of the dispenser head is provided, wherein a connecting section from the pumping chamber to the fluid chamber continues between the distal and proximal ends of the closure piston opens the mass space, which connecting portion has a central axis which extends in a given normal use of the dispenser vertical section at a right or acute angle to the longitudinal axis of the closure piston.

Such dispensers have already become known in various respects. Reference is made to DE-Ul-20 2008 011 730 and WO-Al-2012/126909, for example.

From EP-Bl-670275 it is known with regard to a pressure vessel to depress the dispenser head with an actuating lever, wherein rigidly coupled to the dispenser head, a valve closing the pressure chamber is thereby displaced into a release position and at the same time the closure piston is displaced into an open position.

On the basis of the initially cited prior art, the object of the invention is to provide a dispenser with a pumping chamber and a closure piston for dispensing liquid to pasty mass with regard to the initiation of the dispensing process. According to a first idea of the invention, a possible solution of the problem is given to a dispenser in which the outlet valve is designed to be rigidly coupled to the dispenser head and to actuate in a first movement section of the dispenser head in which a release of the dispenser head is already initiated Closure opening takes place, is placed in an open position, for example, enters the pumping chamber, without causing a reduction of the pumping chamber incidentally. Characterized in that the outlet valve is rigidly coupled to the dispenser head, it is directly coupled motion to a movement of the dispenser head. It can therefore take place at the same time with an opening of the closure opening, a movement of the outlet valve of the pumping chamber in the open position. The opening of the closure opening is accompanied by a corresponding displacement of the closure piston. By only preferably provided displacement of the exhaust valve in the pumping chamber, it comes only to a possibly slight mass displacement in the connecting portion and thus the mass space, which can be absorbed by the displacement of the closure piston, so that it does not yet escape to a mass the shutter opening comes.

The user can thus put the donor in a donation readiness position, without at the same time there is a loss of mass, at least no substantial loss of mass. It is preferred that in the first movement section of the dispenser head, a back suction effect occurs at the dispensing opening.

Further features of the invention are described below, also in the figure description and the drawing, often in their preferred assignment to the already explained above concept or illustrated, but they can also be assigned to only one or more individual Characteristics that are described or illustrated in the drawing, or that are independent or in another overall concept.

Thus, it is preferred that the closure piston has at its proximal end, seen from the distal end beyond the mouth of the connecting portion in the mass space, a sealing formation projecting radially with respect to the longitudinal axis of the closure piston and preferably at its distal end in the closed state Has closure opening retracted closure portion. The sealing formation can conveniently limit the mass space in the axial direction. The closure portion, which is retractable into the closure opening, additionally provides an effective seal of the dispenser in the unactuated resting state.

It is further preferred that the mass space formed between the sealing formation and the closure section, which is filled in any case after a first operation of the dispenser with mass, in which then also filled with mass connecting portion opens, in the first movement section of the dispenser head, in which the addressed displacement of the exhaust valve of the pumping chamber is carried out in the pumping chamber but is still no compression of the pumping chamber incidentally, has a greater volume increase than corresponds to the volume of the same time flowing through the connecting portion mass. As a result of this larger increase in volume, the dispensing opening, that is to say at the distal end of the closure piston, results in a return suction of mass, since the otherwise caused negative pressure can only be compensated by the closure opening. It comes to a "suck back" effect, so that the dispensing opening is exposed before then, for example, in the course of further depressing the dispenser head mass is brought to the application. It is also preferred that the closure portion is cylindrically shaped with respect to the longitudinal axis of the closure piston. The wall of the dispensing opening is preferably designed to be equally cylindrical. In the closed state, two cylinder bodies are in one another.

It is also preferred that the closure section has an extension section toward the proximal end of the closure piston, following a preferably cylindrically formed closure region to form a conical surface. The as indicated preferably cylindrically shaped closure region is correspondingly preferably a smaller-diameter part of the closure piston, so that the spring action in the closure position can also result in a comparatively large press-in force here. Thus, any leftovers or encrustations in the dispensing opening can be effectively overcome by the process of the closure piston into the closed position.

It is also preferred that the conical surface in the closed state also bears sealingly against a correspondingly shaped inner surface of the dispensing head. As a result, the total sealing surface is favorably increased. In addition, there is correspondingly a diverting area from the cylindrical area into the conical area with respect to the adjacent areas in the closed state. There is a labyrinth effect supporting the tightness.

It is also preferable for a continuation section to be formed on the closure piston subsequent to the extension section, the outer surface of which, in the normal state of use of the dispenser in the closed state, delimiting a part of the mass space. It closes at least partially, possibly with the exception of guide sections which abut against a corresponding guide wall of the mass space, mass space through which the mass is guided in the course of dispensing or which is erected in the course of non-use. is taken. The guide sections or an associated guide wall is preferably formed near the distal end of the closure piston.

As a result of this or other measures, it is preferably achieved that during a movement, in particular a movement in the first movement section, movement of the closure piston takes place from the distal end beyond the mouth of the connecting section into the mass area a larger increase in volume of the mass space than in that of the said mouth seen as the distal end of the closure piston associated Masseraum. In particular, it is preferred that, in the first movement section, a movement of, for example, 1 to 2 mm in a vertical direction downwards (with conventional use of the dispenser) of the dispenser head takes place. This can be achieved, for example, by a suitable slotted guide of the closure piston, as basically also known from the aforementioned WO-Al-2012/126909, to which reference is also made, achieved that about half of said path of the dispenser head in the first movement section is converted into a movement of the closure piston. Accordingly, the closure piston in this case perform a movement of about 0.5 to 1 mm.

It is further preferred that in the second movement section, the dispenser head performs a movement of 2 to 4 mm, but only a small part of this movement is then converted into a further movement of the closure piston in the direction of its proximal end along the longitudinal axis. For example, the proportion of the motion, which is then reacted in the second movement section in a movement of the closure piston, ^1/25 to V io amount of movement of the dispenser head in this second movement section. Reverse conditions arise accordingly in a return movement of the dispenser head from the most depressed position back to the starting position. In this case, a movement of only the dispenser head initially takes place, with the outlet valve coupled thereto, which is accordingly moved into the closure position without the pump piston being moved or the pump chamber being increased again, at least not significantly. This is correspondingly associated with a movement of the closure piston in the direction of its longitudinal axis and in the direction of the distal end by a portion of the amount that the closure piston (only) has performed in the second movement section, with the same amount of partial movement (relative to the second movement section ) of the dispenser head to vertically above. Then follows a fourth movement section of the dispenser head, in which the vertical dimension of the remaining part of the second movement section and the measure of the first movement section in the reverse direction is passed through by the dispenser head.

The invention also relates, as a further subject matter, to a dispenser, in particular according to the features of the preamble of claim 1, but where, for example, it is not necessary, although preferred, for the connecting section to be at an acute angle to a longitudinal axis of the closure piston, it being preferred to provide in that the closure piston is arranged in a receiving part and a pump piston forming the pumping chamber is arranged to be movable in a limited manner relative to the receiving part.

Furthermore, it can alternatively or additionally be provided that a pipe part having the flow-through opening is plug-connected to the receiving part. Also, the pipe part may enforce the pump piston preferably centrally. Furthermore, the tube part can form a valve plate and / or a flow-through opening. the. In addition, the tube part can form a driving projection. It can further be provided that the pipe part is formed integrally with the valve plate and / or the flow openings and / or a driving projection.

Furthermore, one or more of the further described features can be realized in this article.

It is also preferred that an outer wall of the closure piston to form the mass space is surrounded by a mass area wall of the dispensing head over the length of the closure piston with a different radial distance. The mass space preferably does not have the same radial extent over the entire length. Rather, this can be different. It may also be different in relation to a vertical section with respect to a region above the closure piston or in the upper region of the closure piston and a region below the closure piston or in the lower region of the closure piston.

In the following, the invention will be explained further with reference to the accompanying drawing, which, however, represents only one embodiment of the invention. Hereby shows:

Figure l shows a cross section through the dispenser, in the upper region, in the unactuated state.

Fig. 2 is a view according to Figure 1, after passing through a first

Movement section of the dispenser head;

FIG. 3 shows an enlargement from FIG. 2 in the region of the dispensing opening; FIG. 4 shows an illustration of the dispenser according to FIG. 1 after passing through a second movement section of the dispenser head during depression;

5 shows an illustration according to FIG. 1 or FIG. 4 after initiation of a return movement of the dispensing head and passing through a third movement section; and

Fig. 6 is a view according to Figure 1, the end of the return movement, with the inlet valve still open.

Shown and described is a dispenser 1, which is shown only in the upper area.

The dispenser serves to dispense liquid to pasty masses. For example, creams.

The dispenser has a dispenser head 2, a storage chamber 3 and a pumping chamber 4.

In the dispenser head 2, a dispensing opening 5 is formed, which can be closed by a closure piston 6 or released for donations. The closure piston 6 has a distal end 7 and a proximal end 8.

In the dispenser head 2, a mass chamber 9 is further formed, in which mass the closure piston 6 surrounds and is held ready for dispensing. The mass space 9 is connected to the pumping chamber 4 via a connecting section 10, which may also be designated as a connecting line. The pumping chamber 4 is bounded on the one hand by an inlet valve 11 which separates the pumping chamber 4 from the reservoir 3, and on the other hand by an outlet valve 12. The outlet valve 12 is rigidly coupled to the dispenser head 2, so that it can be moved in a relative movement of the dispenser head 2 to a fixed part of the dispenser, for example, the guide member 13, in an open position or a closed position.

When actuated, the dispenser head 2 first passes through a first movement section which leads to a movement by the amount a, cf. Figures 1 and 2, leads. This first movement section is characterized in that, although the outlet valve 12 of the pumping chamber 4 is moved into an open position, in which it is immersed in the pumping chamber 4, as apparent from a comparison of Figures 1 and 2, but the pumping chamber 4, moreover, not yet is reduced. The dispenser head 2 passes through an idle stroke, in which only the outlet valve and the closure piston are acted upon.

In the exemplary embodiment, the pump chamber 4 is bounded on the one hand by a preferably fixed bottom part 14 and on the other hand by a pump piston 15 which can be moved by the dispenser head 2. The pump piston 15 is guided in a manner known per se by means of vertically spaced sealing lips on a stationary pump chamber wall of the dispenser.

On a second movement section, which results from a comparison of FIGS. 2 and 4, and in which the dispenser head 2 is subsequently connected to the amount a by the amount b, cf. 4, is moved, the pump piston 15 - based on a conventional lineup of the dispenser in a dispensing operation - further moved vertically down, with the outlet valve 12 still open, so that the pumping chamber 4 is reduced and mass M is discharged from the dispensing opening 5 , see. about figure 4. A transition from the first to the second Motion section is also tactile for a user. The compression of the pumping chamber is associated with a noticeably higher resistance.

The dispenser head 2 consists in a further detail of a cap 34, in which the upper side of an actuating recess 16, for supporting about a finger of an actuating hand, is formed.

Within the dispenser head is fixedly arranged and formed in accordance with this movable a receiving part 17, in which the closure piston 6 is received to form the mass chamber 9. Further, in the preferably integrally formed receiving part 17 and the connecting portion 10 is formed.

The receiving part 17 has for the closure piston 6 guide portions, of which in the illustration a guide portion 18 can be seen.

In the receiving part 17, the outlet valve 12 of the pumping chamber 4 is further accommodated or connected to the pumping chamber side, preferably plug-retained.

In a third movement section, cf. FIGS. 4 and 5, the dispenser head 2 again moves so far that the outlet valve closes. The degree of movement corresponds to the measure a. In further detail, the outlet valve 12 has a tubular plug-in portion 19, which in the following, where it does not depend on the plug-in function, but this may be given, is also referred to as a tube part, the pumping chamber side is limited by a valve effect providing the closure plate 20. The closure plate 20 is further preferably pump chamber side provided with driving projections 21. The driving projections 21 allow it, the pump piston 15 in a fourth movement section, which is just traversed in the illustration of Figure 6, mitzuschleppen from the position of Figure 5 in the position of Figure 6. The outlet valve 12 further preferably has on the head side of the closure plate 20 one or more passage openings 22, through which in the opening state of the outlet valve 12 when reducing the pumping chamber 4 mass M from the pumping chamber 4 in the connecting portion 10, from there into the mass chamber 9 and finally to the outlet from the dispensing opening 5 is conveyed.

The passage openings 22 are preferably also formed in the, more preferably tubular, plug-in section 19. Upon actuation of the dispenser head 2 corresponding to the first movement section, see also FIG. 2, they enter the management position, so that starting from this position of the outlet valve 12 further depression of the dispenser head 2 mass M from the pumping chamber 4 in the manner described can flow into the connecting portion 10.

The receiving part 17 is guided in the already mentioned, in the assembled state housing-fixed guide member 13. For this purpose, the guide part 13 has a preferably central and more preferably cylindrical guide opening 23, into which the receiving part 17, depending on the actuation state and the movement section passed through, has different depths with a plug-in section adapted thereto.

The receiving part 17 is further supported against a bottom portion 24 of the guide member 13 via a return spring 25. The return spring 25 is compressed when passing through said movement sections of the dispenser head 2 or ensures the return of the dispenser head 2 into the starting position according to FIG. 1. The receiving part 17 forms, preferably in its retracted into the guide member 13 area, on the one hand a larger diameter abutment portion 26 for the return spring 25 and further preferably on the other hand a diameter smaller, but more preferably a total cylindrical insertion portion 27, in a guide portion 28 of the guide member 13 is received and is vertically movable therein.

In the guide section 28, a guide projection 29 of the pumping piston 15 is also received, which is likewise vertically movable therein. The guide projection 29 is also guided on the plug-in section 19.

After passing through the first movement section, as shown in Figure 2, an end face of the engagement section 27 comes to rest on a corresponding surface of the guide projection 29 of the pump piston 15 and thus pushes the pump piston 15 when passing through the second movement section vertically downwards, whereby the volume the pumping chamber 4 is reduced accordingly. The dimension a thus preferably corresponds to a distance between the inflow section 27 (lower end face) given in the unactuated state of the dispenser and the associated surface of the pump piston, here in particular the guide projection 29.

The end face of the entry section 27 and / or the corresponding surface of the guide projection 29 of the pump piston 15 is preferably V-shaped in cross-section, widening radially outward with respect to a central axis A of the connection section 10.

The inlet valve 11 of the pumping chamber 4 is formed in the embodiment as a check valve. In detail, a plug part 30 is provided, which is seated in a plug-in opening 31 of the bottom area of the bottom part 14. ambient For this purpose, one or more passage openings 32 are formed which are covered by a membrane part 33 enclosed between the bottom area of the bottom part 14 and the plug part 30. In the course of a return movement of the pump piston 15 into the starting position, ie approximately from the position of FIG. 5 into the position of FIG. 6, mass M is sucked out of the storage space 3 through the inlet valve 11, lifting the membrane 33 away from the passage openings 32 FIG. 6 shows the state of the dispenser at the end of this return movement. Merely for clarity, the inlet valve 11 is still shown in the open state.

The guide projection 29 of the pump piston 15 is visible on the one hand, radially outward, guided on the inner surface of a guide wall of the guide member 13, on the other hand, on the inside, on an outer surface of the plug portion 19. A guide on one of these parts may also be sufficient.

With reference to FIG. 3, the geometric configuration of the closure piston 6 can be seen in its detail in its distal end region. The foremost part, the closure section 37, preferably has a cylindrical closure region 42. This is adjoined by a conical surface 38, with which the closure plug widens conically starting from the closure region 42. The conical surface 38 is followed by a continuation section 40. The continuation portion 40 is provided in the opening and closing state over its circumference with different radial distance to the Masseraumwandung 41 extending. Im - in relation to a usual utilization position - the upper area is obviously given a very small distance, in the lower area, however, a larger. The cone surface 38 is in the closed state at an associated donor head surface 39.

As can also be seen, for example, in FIG. 4, the connecting portion 10 opens into the mass space 9 at the mouth 35. The closure piston 6 has at its proximal end a radially protruding sealing formation 36 which cooperates sealingly with the surrounding mass space wall 41. A central axis A of the connecting section 10 encloses an acute angle α with a longitudinal axis L of the closing piston 6 (cf., for example, FIG. The angle α can be, for example, 10 ° to 85 °, wherein all mean values, in particular in whole degrees, are also included here in the disclosure.

The above explanations serve to explain the inventions as a whole covered by the application, which independently further develop the state of the art, at least by the following combinations of features, namely:

A dispenser, which is characterized in that the outlet valve 12 of the pumping chamber 4 is rigidly coupled to the dispenser head 2 and when actuated in a first movement section of the dispenser head 2, in which already a release of the closure opening 5, a movement into the open position takes place, for example, the exhaust valve 12 enters the pumping chamber 4, without causing a, in any case no significant, reduction of the pumping chamber 4 incidentally.

A dispenser, which is characterized in that the closure piston 6 at its proximal end, as seen from the distal end beyond the Münch- Extension 35 of the connecting portion 10, a radially with respect to the longitudinal axis L of the closure piston 6 projecting Dichtausformung 36 and at its distal end has a retracted in the closed state in the dispensing opening 5 closure portion 37.

A dispenser, which is characterized in that the mass space 9 formed between the sealing formation 36 and the closure portion 37, which is filled in any case after a first actuation of the dispenser 1 with mass M, in which the then also filled with mass M connecting portion 10 opens, in the first movement section of the dispenser head 2 has a larger increase in volume than corresponds to the volume of the mass M flowing simultaneously through the connecting section 10.

A dispenser, which is characterized in that the closure section 37 has a closure region 42 which is cylindrically shaped with respect to the longitudinal axis L of the closure piston 6.

A dispenser which is characterized in that the closure section 37 has an extension section toward the proximal end of the closure piston 6, subsequently to the closure region 42, forming a conical surface 38.

A dispenser, which is characterized in that the conical surface 38 in the closed state likewise bears sealingly against a correspondingly shaped dispenser head surface 39.

A dispenser, which is characterized in that subsequent to the extension section on the closure piston 6, a continuation section is formed whose outer surface delimits a part of the mass space 9 during normal dispenser use in the closed state. A dispenser, which is characterized in that an outer surface of the closure piston 6 for forming the mass space 9 is surrounded by a Masseraumwandung 41 of the dispensing head over the length of the closure piston 6 with a different radial distance.

A dispenser, which is characterized in that an outer surface of the closure piston 6 for forming the mass space 9 is surrounded by a Masseraumwandung 41 of the dispensing head over the circumference of the closure piston 6 with a different radial distance.

A dispenser, which is characterized in that the pump piston 15 is arranged relative to the receiving part 17 limited movement. A dispenser, characterized in that the connection is given by means of a pipe part.

A dispenser which is characterized in that the pipe part having a flow-through opening is plugged into the receiving part 17.

A dispenser, which is characterized in that the tubular part passes through the pump piston.

A dispenser, which is characterized in that the tube part passes through the pumping piston centrally.

A dispenser characterized in that the pipe part forms a valve plate. A dispenser, which is characterized in that the pipe part forms flow openings.

A dispenser, which is characterized in that the tubular part forms a driving projection 21.

A dispenser, characterized in that the tube part is formed integrally with the valve plate. Dispenser according to one of the preceding claims, characterized in that the tubular part is formed integrally with the flow-through openings.

A dispenser, which is characterized in that the tubular part is formed integrally with a driving projection 21.

A dispenser, which is characterized in that the closure part is designed as a closure piston 6.

LIST OF REFERENCE NUMBERS

1 dispenser 26 counter bearing area

2 dispenser head 27 access section

3 storage space 28 guide section

4 pumping chamber 29 guiding projection

5 Dispensing opening 30 Plug part

6 locking piston 31 insertion opening

7 distal end 32 passage opening

8 proximal end 33 membrane part

9 mass space 34 cap

10 connecting portion 35 mouth

11 inlet valve 36 Dichtausformung

12 outlet valve 37 closure section

13 guide part 38 conical surface

14 bottom part 39 donor head surface

15 pumping piston 40 continuation section

16 actuating recess 41 Masseraumwandung

17 receiving part 42 closure section

18 leadership section

19 plug-in section a amount

20 closure plate b amount

21 Driving projection α Angle

22 passage opening A central axis

23 Guide opening L Longitudinal axis

24 floor area M mass

25 return spring

Claims

1. dispenser (1) for dispensing liquid to pasty masses, with a dispensing of mass (M) against spring force movable dispenser head (2), a storage space (3) and an inlet valve (11) and an outlet valve (12) having pumping chamber (4), wherein in the dispenser head (2) a dispensing opening (5) is formed and for closing or releasing the dispensing opening (5) in the direction of its longitudinal axis (L) movable, one of the dispensing opening (5) associated distal and a proximal end is provided, wherein further between the distal and proximal end of the closure piston (6) a connecting portion (10) from the pumping chamber (4) to the mass space (9 ), which connecting portion (10) has a central axis (A), in a given normal use of the donor (1) vertical section at a right or acute angle (a) to the Längsachs e) of the closing piston (6), characterized in that the outlet valve (12) of the pumping chamber (4) is rigidly coupled to the dispensing head (2) and is actuated in a first movement section of the dispensing head (2), in a release of the closure opening (5) already takes place, a movement in the open position takes place, for example, the outlet valve (12) enters the pumping chamber (4), without causing a, in any case, no significant, reduction of the pumping chamber (4) otherwise comes.

2. Dispenser according to claim 1, characterized in that the closure piston (6) at its proximal end, as seen from the distal end beyond the mouth (35) of the connecting portion (10), a radially with respect to the longitudinal axis (L) of the closure piston (6 ) has projecting Dichtausformung (36) and at its distal end in the Closing state in the dispensing opening (5) retracted closure portion (37).

Dispenser according to one of the preceding claims, characterized in that between the Dichtausformung (36) and the closure portion (37) formed mass space (9) which is filled in any case after a first operation of the dispenser (1) with mass (M), in which the then likewise filled with mass (M) connecting portion (10) opens, in the first movement section of the dispenser head (2) has a larger volume increase than the volume of the same at the same time by the connecting portion (10) nachströmenden mass (M).

Dispenser according to one of claims 2 or 3, characterized in that the closure portion (37) has a relative to the longitudinal axis (L) of the closure piston (6) cylindrically shaped closure region (42).

Dispenser according to Claim 4, characterized in that the closure section (37) has an extension section towards the proximal end of the closure piston (6), following the closure region (42), forming a conical surface (38).

Dispenser according to claim 5, characterized in that the conical surface (38) in the closed state also bears sealingly against a correspondingly shaped dispenser head surface (39).

Dispenser according to one of claims 5 or 6, characterized in that subsequent to the extension section on the closure piston (6) a continuation section is formed, the outer surface of which, with conventional dispenser use in the closed state, part of the mass flow. limited space (9).

8. Dispenser according to one of the preceding claims, characterized in that an outer surface of the closure piston (6) for forming the mass chamber (9) by a Masseraumwandung (41) of the dispensing head over the length of the closure piston (6) is surrounded with different radial distance.

Dispenser according to one of the preceding claims, characterized that an outer surface of the closure piston (6) for forming the

Mass space (9) of a Masseraumwandung (41) of the dispenser head over the circumference of the closure piston (6) is surrounded with different radial distance. 10. dispenser for dispensing liquid to pastöster masses with a for output of mass (M) movable against spring force dispenser head (2), a storage chamber (3) and a pumping chamber (4), wherein in the dispenser head (2) a dispensing opening (5) is formed and the pump piston (15) with a closure member receiving part (17) is connected, characterized in that the pump piston (15) relative to the

Receiving part (17) is arranged limited movable.

Dispenser according to claim 10, characterized in that the connection is given by means of a pipe part.

12. Dispenser according to claim 10 or 11, characterized in that the flow-through having a tubular part with the receiving part (17) is plug-connected.

13. Dispenser according to one of claims 11 or 12, characterized in that the tubular part passes through the pump piston.

14. Dispenser according to claim 13, characterized in that the tubular part passes through the pump piston centrally.

15. Dispenser according to one of claims 11 to 14, characterized in that the tubular part forms a valve plate. 16. Dispenser according to one of claims 11 to 15, characterized in that the pipe part forms flow openings.

17. Dispenser according to one of claims 11 to 16, characterized in that the tubular part forms a driving projection (21).

18. Dispenser according to one of claims 11 to 17, characterized in that the pipe part is formed integrally with the valve plate.

19. Dispenser according to one of claims 16 to 18, characterized in that the pipe part is formed integrally with the flow-through openings.

20. Dispenser according to one of claims 17 to 19, characterized in that the tubular part is formed integrally with a driving projection (21).

21. Dispenser according to one of claims 19 or 20, characterized in that the closure part is designed as a closure piston (6).