WO2009040295A1

WO2009040295A1 - Internal tubal dosing feeder having piston and valve

Info

Publication number: WO2009040295A1
Application number: PCT/EP2008/062475
Authority: WO
Inventors: Elvira Ahrens; Hans-Joachim Ahrens; Stephan Ahrens; Janet Ahrens; Michael Raeth
Original assignee: Krallmann Kunststoffverarbeitungs Gmbh
Priority date: 2007-09-21
Filing date: 2008-09-18
Publication date: 2009-04-02
Also published as: EP2190754A1; DE102007045406A1; EP2190754B1; ATE542752T1

Abstract

The invention relates to an internal tubal dosing feeder having a piston that can also be inserted in the neck of bottles made of plastic for dispensing a very particular, defined amount of creme when a tube is squeezed, wherein the creme or paste can be cosmetic, medical, technical, or other types. To this end, a dosing sleeve (4) is disposed in the neck (1) of a tube (2) or bottle (3), an outer transverse opening (6) being made in the front end (5) thereof and opening in a ring chamber (7, 31) between the dosing sleeve (4) and the neck (1). At least one internal transverse opening (10) is made in the rear end (9) of the dosing sleeve (4), extending into the internal space (11) of the tube (2) or bottle (3). An external piston (12) having a piston rod (13) directed toward the internal space (11) and displaceable by a compression and/or tension spring (19) is displaceably disposed in the dosing sleeve (4). The bore (14) of an internal piston (15) is displaceable back and forth on the piston rod (13') between two stops (16, 17), up to a defined distance (A=H) to each other, thereby exactly defining the dosing volume.

Description

Internal tube dispenser with piston and valve description

The invention relates to an internal Tubendosierer with piston and valve for tubes made of aluminum or plastic, which can also be used in the neck of plastic bottles to donate a very specific, defined amount of cream when pressing a tube or a bottle, where it is to trade cosmetic, medical, technical and other creams and pastes. For example, you want to dose hormone creams for the skin for treatment in the climacteric very accurately, otherwise there is a risk of the development of cancer.

Known dosers for tubes are usually pump feeders, as they are known from soap dispensers ago. Their dosing accuracy is insufficient for medical purposes.

For example, tube dispensers for two components according to EP 0 561 719 B1 are known, in which, however, no doses of certain strand lengths of cream take place. Furthermore, a tube dispenser according to EP 0 508 168 B1 is known, however, which is concerned with the geometry of the tube shoulder and the back suction effect of cream. Finally, dosers are known according to US 2006/0169716 A1, which deal with the squeezing of residual toothpaste from tubes.

For consumer applications, such as for hair dyes, it is troublesome to do the activation of the dosing system with screwing on the cap,

The aim of this invention is to find a solution that makes it possible to dose very accurately in the range of 1 to + - 5%. Activation of the dosing device should be very easy and automatic after each dosing. The technique should as far as possible be placed in the neck of the tube and barely or invisibly for the user. The task is solved according to the main claim and its ancillary claims. For this purpose, a metering sleeve is fitted or formed in the neck of a tube or Ffasche, in the front end of an outer transverse opening is introduced, which opens into an annular space between the metering and the neck. In the rear end of this dosing sleeve, an inner transverse opening is introduced with any cross-section, which is connected to the interior of the tube or bottle, as is set by the elevations on the Dosierhüise a radial distance to the neck of the tube.

In the dosing two dependent movable within defined limits, mechanically controlled and coupled pistons are mounted. First, an outer piston is movably arranged therein with a piston rod directed towards the inner space.

Secondly, an internal piston with its bore should move between two stops up to a defined distance from each other on the piston rod.

In order to convey the pistons automatically back to the starting position after dispensing, two solutions are proposed according to the invention:

1. Between the bottom and the outer piston, a compression spring is inserted.

2. A tension and / or compression spring which is supported on the inner end of the dosing sleeve is fastened to the inner end of the piston rod

Depending on the design of the tube dispenser according to the invention, such a compression spring, the tension spring or a tension compression spring made of a stainless metal, be made of a plastic or of an elastomer. As plastic, especially POM and PA are eligible.

The compression or tension spring triggers practically the first cycle of dosing, it manufactures readiness for work. It pushes or locks the outer piston behind the inner transverse opening to an inner stop in the dosing sleeve. The spring can, as I said made of stainless metal, but also made of plastic or an elastomer. The dosing itself has outside in the area between the outer

Transverse opening and the inner transverse opening one or more elevations in the form of a mounting sleeve, webs or the like, so that the

Dosierhüise can be kept in the larger inner diameter of the neck and an annulus can arise in the front area.

When the cap is screwed on, press a wall or a collar onto it

Ring valve.

When dosing, the outer bulb is pressurized

Cream that flows into the inner cross hole, towards the

Pushed exit opening. It draws after overcoming the maximum

Hubes of the inner piston, the distance between the two stops on the

Piston rod corresponds, the inner stop the inner piston against the

Spring force of the pressure and / or tension spring in the direction of the outlet opening with.

That is already the dosing process itself, since now the inner piston presses against the cream which has previously flowed into the dosing chamber and thus predosed, and the same over the outer transverse opening of the dosing sleeve and the

Annulus in the mixing chamber and then flows over a resiliently outwardly curved ring valve to the outside. The molded on it, so-called

Valve shield springs from the outside of the dosing sleeve towards the front during dispensing and thus releases a ring clamp.

The outer piston was previously pressed in the direction of the outer stop. His forward movement stops when he has largely compressed the compression spring, which is in the main

Embodiment is supported on the bottom of the dosing sleeve.

Exactly then, the cream flows out in fractions of a second, because the inner piston is pushed forwards. He has a hole and possibly even a small piston sleeve for better sealing on the

After the dosing by the further advance of the inner

Koibens emptied forward, the latter presses against the outer stop on the piston rod in the direction of the outer Koibens. The later described in more detail, soft-elastic ring valve springs from the

Mixing chamber away. However, it should be seen again at the beginning of the dosing process:

The inner piston remains at the beginning of the dosing process in its final position in the inner end of the dosing sleeve, since the pressure of the cream presses on the inner side and the inner transverse bore on the outer side of the piston crown at the same time so that the pressures cancel. A very flat raised, a snap ring or Schapppunkte within the dosing sleeve, located approximately on the outer side of the inner piston leaves him there in the initial phase safely. In addition, a stop collar inside the dosing sleeve secures the inner piston in its end position and prevents it from slipping into the interior. The pressure of the cream now acts on the inner side of the outer piston via the inner transverse opening until it has reached the outer stop. The inner piston should have to seal against the thinner portion of the piston rod directed towards the interior, a small cuff. The inner piston could also be made of an elastomer such as TPE or TPV, so it would be perfectly elastic and tight. The inner piston now migrates to the outer stop on the piston rod, whereby the exactly defined by the stroke volume is donated and was pressed through the annular gap between dosing sleeve and neck in an annulus, in a so-called mixing chamber. In order to donate the cream without any residue at the mouth properly dosed out of the tube, a special mixing nozzle with a sleeve-shaped or disc-shaped, flat or wavy ring valve has been thought: In a first embodiment, this mixing nozzle is tightly attached to the front of the dosing , on whose front side in turn a perforated Ventiibeibe, a so-called ring valve with a valve screen made of an elastic material is molded or attached. The softer ring valve should preferably be molded in the two-component injection molding of the harder sleeve of the mixing nozzle. However, the mixing nozzle can also be made in one piece with the ring valve made of a soft plastic, for example TPE, TPV or silicone. Instead of the ring valve and the front part of the mixing sleeve may be made of a soft elastic material. For this or for the ring valve is a

TPE, TPV or a silicone provided.

Its installation can be done directly on the dosing sleeve or by a

Clamping ring supported at the end of this soft-elastic

Mixing nozzle is formed.

The dosing sleeve has on the outside at least one locking collar, which does not allow the cream to flow through the annular gap between the neck and the dosing sleeve.

When pressure on the tube or Fiasche springs the opening of the ring valve or its valve shield from the outside of the dosing and gives a

Ring gap free.

The front outlet opening of the ring valve is closed after dispensing, when the pressure on the tube has decreased, by the valve sleeve of the ring valve, which springs back inwards onto the dosing sleeve.

Thus, all conditions of sterility of a donor for medical

Creams, such as for testosterone or estrogen creams or eye ointments.

In addition, there is no so-called with this technique

"Suction effect", no germ-laden cream that was already on the skin was sucked back into the dispenser - one of the most important requirements of pharmaceutical manufacturers.

It is particularly advantageous that the user does not have to perform any manipulations, such as the actuation of adjusting rings, etc., due to the automatically recoiling pistons, the handling is simple and self-explanatory. This is especially important for older, tough people.

Further embodiments can be found in the following examples and Figures 1 to 23. Showing:

Figure 1 to 3 - A Tubendosierer, cap closed, Figure 4 to 6 - A Tubendosierer without cap, Druckferder before the outer bulb, immediately "before donating",

Figure 7 to 9 - A Tubendosierer whose outer piston was pushed slightly forward: "fill dosing"

FIGS. 10 to 12 show a tube dispenser whose outer piston has been pushed maximally to the outer boundary, whereby the inner piston has been pulled along: "dosing chamber filled",

Figure 13 to 15 - A Tubendosierer whose inner piston

Pushing forward: "Donating"

FIGS. 16 to 18 show a tube dispenser whose outer piston has been pressed maximally to the outer boundary, wherein the inner piston was pressed against the outer stop of the piston rod at the end of the dispensing process: "dispensing process completed"

FIGS. 19 to 20 show a ring valve and a metering sleeve individually;

Figure 21 to 23 - A Tubendosierer with a tension-compression spring on

End of the piston rod, whose outer piston was pushed forward slightly: "Fill dosing chamber"

Figure 1 shows an illustration of a Tubendosierers with screwed cap 18 on a tube 2 in the side view

FIGS. 2 to 3 show two sections through this tube dispenser with tube 2 with the cap 18 screwed on. A ring valve 40 can be seen at the outlet opening 8 of the mixing nozzle 30, which is designed as an annular space 7 or as a mixing chamber 31. The outer piston 12 and the inner, entrained piston 15 are through a at the bottom 20 of a dosing sleeve 4 supporting pressure spring 19 completely inwards to an inner

Stop collar 47 pushed in the dosing sleeve 4.

In the neck 1 of a tube 2, the dosing sleeve 4 with its webs 24 with two

Sperrbunden 36 has been pressed so tight that the annular space 7 results, which is partially crossed by the webs 24.

In the front region 5 of the dosing 4 are two outer

Transverse openings 6, 6 'introduced in an annular space 7 between the

Dosing sleeve 4 and the mixing nozzle 30 open, which at a radial distance

B to the sleeve 46 of the mixing chamber 31 represents.

On the end face 37 of the mixing nozzle 30, a disk-shaped ring valve 40 made of a TPV of the Shore A hardness 30 with a planar valve screen 44 with the central outlet opening 8 is formed in the 2K process.

In the rear end 9 of the Dosierhüise 4 are two inner transverse openings 10,

10 'introduced with a rectangular, rounded cross section, which protrude into the interior 11 of the tube 2 in or over the inwardly open

Webs 24 have a connection there.

In the dosing sleeve 4 two, in the defined limits H depending movable piston 12 and 15 are mounted. First, inside is an outer piston

12 arranged with a directed towards the interior 11 towards the piston rod 13, 13 'movable. The sleeve 12 'points in the same direction.

Second, moves on the slightly thinner portion of the piston rod 13 ', the bore 14 of an inner piston 15 between two stops 16 and

17 to a defined distance A = H to each other.

The compression spring 19 triggers after unscrewing the cap 18 practically the first cycle of dosing, it establishes the willingness to work. It pushes the outer piston 12 inwards, which in turn with the outer

Stop 16 at its piston rod 13 behind the inner piston 15, a very small, located behind the inner transverse opening 1O ₁ 10 '

Increasing 21 is locked in the dosing sleeve 4. It is also important, only a few tenths of a millimeter high, inner stop collar 47, so that the inner

Piston 15 can not slide into the interior 11.

The dosing sleeve 4 itself has in the region 23 between the outer

Transverse opening 6 and the inner transverse opening 10, 10 'an increase 24 in the

Form of a mounting sleeve 24, so that the dosing sleeve 4 in the larger Inner diameter of the neck 1 can be maintained and necessary for the function annulus 7 can arise in the front area. When cap 18 is screwed on, its inside 25 presses against ring valve 40 to ensure perfect sealing.

Figures 4 to 6 show a Tubendosierer with removed cap 18 and with the two pistons 12 and 15, which are positioned in their final position to the left and right of the inner transverse openings 10, 10 '. If one presses on the tube 2, according to the figures 7 to 9, the cream in the two inner transverse openings 10, 10 'is pressed. As a result, the inner piston 15 is pressurized from both sides, whereby the pressures cancel and he stops in its final position. This process is supported by four very small snap points 21 in the metering sleeve 4 between the inner transverse bore 10 and the inner piston 15. In contrast, the cream now presses on the inside of the outer piston 12 and this leaves him first by the path length of his stroke H to the outside migrate, see Figure 10 to 12.

Subsequently, the inner stop 17 takes on the inner portion 13 'of the piston rod 13, which extends through the bore 14 of the inner piston 15, selbigen in the direction of the outer transverse opening 6, until the outer piston 12 has arrived at the now compressed compression spring 19. The dosing 26 has been previously filled with cream. As a result, was pushed completely into the technical system of these two coupled pistons 12 and 15 with the incompressible cream in the middle, namely in the metering chamber 26, to the outside. The further applied pressure of the cream on the inner piston 15 ensures that it is pressed according to the figures 13 to 15 in the direction of the outer piston 12. Its bore 14 seals against the thinner portion 13 'by means of a small sleeve 15 ^! perfect. In this case, the ring valve 40 springs from the outside 42 of the metering and thus releases an annular gap 49 from the mixing nozzle 30 to the outside. After the pressure on the tube 2 subsides, the ring valve 40 again compresses the mixing chamber 31 in a sealing manner on the outside 42 of the dosing sleeve 4 and thus prevents a sucking back of contaminated cream. In FIGS. 16 to 18, the inner piston 15 is up to the outer

Stop 16 of the piston rod 13 has been pressed, whereby the metered

Amount of cream over the outer transverse opening 6 and the annular space 7 in the

Mixing chamber 31 was pressed out of the outlet opening 8, which corresponds exactly to the stroke H multiplied by the fourth part of the square of the inner diameter of the dosing sleeve 4. The

Dosage accuracy is therefore extremely high.

On the front side 27, on the front portion 28 of the dosing sleeve 4 or on or on the blind thread 35, a mixing nozzle 30 is tightly secured, the lateral outlet openings 6, 6 'of the radial outlet B at a radial distance

Dosierhüise 4 surrounds and at an axial distance C to the outside 42 of the dosing sleeve 4 forms a mixing chamber 31 having a coaxial to the main axis 32, the front outlet opening 8.

The discharge opening 8 of the ring valve 40 is sealed after donation by the re-inwardly sprung valve screen 44 of the ring valve 40.

The compression spring 19 ensures that the piston pair 12, 15 back in

Direction of the interior 11 is pressed.

In Figure 19, a single annular valve 40 is shown, the disc-shaped Ventiischirm 44 is shown in the sprung position.

FIG. 20 shows the dosing sleeve 4 with its two locking collars 36, which prevent the cream from being pressed over this area. The webs 24 center the dosing sleeve 4 in the neck 1 of the tube 2.

In the position: "fill metering chamber" Figures 21 to 23 a

Tubendosierer with a train compression spring 19 at the end 17 of Kolbestange

13 '. Here is a very different suspension of the train compression spring 19 as shown in the previous figures.

However, the work phases are absolutely comparable to those of the previous ones,

The compression spring 19 is first pressed to the center thereof and then pulled outward by itself. The outer piston 12 has already been pressed slightly forward in this position. LIST OF REFERENCES:

1 neck

2 tubes

3 bottle

4 dosing cases

5 front end

6 outer transverse opening 66 '' ääußeerre transverse opening

7 annulus

8 outlet opening 88 '' AAußensseen side

9 back end

10 Inner transverse opening 1100 '' iinnnneerree cross opening

11 interior

12 outer piston 1122 '' MMaannsscchette

13 piston rod 1133 '' innnneerreer area

14 hole

15 inner piston 1155 '' kklleeiinnee cuff

16 outer stop

17 inner stroke

18 cap

19 compression spring and / or tension spring

20 bottom of dosing sleeve

21 increase, snap ring, snap point

22 inside

23 area

24 elevation, mounting sleeve, bars

25 inside of the cap

26 dosing space

27 front side of the neck

28 Front section of dosing sleeve

29 Front side of the kobenanschlag

30 mixing nozzle

31 mixing chamber, elastic or rigid

32 main axis. 33

34 bottom of the outer bulb

35 blind threads

36 locking collar on the dosing unit

37 end face of the mixing chamber

38 increase for the outer piston

40 ring valve, sleeve valve

41 inside of the ring valve

42 Outside of dosing sleeve

43 Outside of the ring vent

44 valve screen

45 clamping ring for mixing nozzle

46 Sleeve of the mixing nozzle, rigid or elastic

47 stop collar in the dosing hoist

48 stop in the cap

A distance

H stroke

B radial distance

C axial distance

D distance

Claims

Internal Tubendosierer with piston and spring claims

1. Internal tube dispenser with piston and spring, which can also be used in the neck of plastic bottles to donate a very specific, defined amount of cream pressing a tube, which are cosmetic, medical, technical and other creams and pastes handein can, characterized

• that in the neck (1) of a tube (2) or bottle (3) a dosing sleeve (4) with a bottom (20) to the outside (8 ¹ ) is arranged out in the front end (5) at least one outer transverse opening (6, 6 ¹ ) is introduced, which open in an annular space (7, 31) between the dosing sleeve (4) and a mixing nozzle (30),

That in the rear end (9) of the dosing sleeve (4) at least one inner transverse opening (10, 10 ') is introduced, which is connected to the inner space (11) of the tube (2) or bottle (3),

That an outer piston (12) with a piston rod (13) directed towards the inner space (11) or with a flexible band (13 ") is arranged movably in the dosing sleeve (4),

That an inner piston (15) is movable up to a defined distance (A) from the outer piston (12) on the piston rod (13, 13 '),

That either between the bottom (20) and the outer piston (12) a compression spring (19) or at the inner end (9) of the dosing sleeve (4) supporting the tension and / or compression spring (19 ¹ ) at the inner end ( 17) of the piston rod (13) is attached, That when dosing the outer piston (12) of the pressurized cream, which has flowed into the inner transverse opening (10, 10 ') is pushed in the direction of the outlet opening (8), wherein after overcoming the stroke (H), the corresponds to the distance (A), the inner stop (17) has pulled the inner piston (15) in the direction of the outlet opening (8),

• that after dosing the outer piston (12) with its bottom (34) to the outer bottom (20) or to the compressed compression spring (19) pressed in the dosing sleeve (4) and the inner piston (15) to the outer transverse bore (6, 6 ^J ) and / or pushed to the outer stop (16) of the piston rod (13, 13 '),

That on the front portion (28) of the dosing sleeve (4), on the front side (27) of the neck (1) and / or on or on the blind thread (35) a mixing nozzle (30) is tightly secured in a radial distance (B) surrounds the lateral outlet openings (6, 6 ') of the dosing sleeve (4), wherein at least on the end face (37) of the mixing chamber (31) a soft-elastic, disc-shaped ring valve (40) with a Ventüschirm facing towards the main axis ( 44) is fastened or formed, which has a main axis (32) coaxial, front outlet opening (8),

• that after donating the inside (41) of the ring valve (40) sealingly on the outside (42) of

Dosing sleeve (4) is sprung and

• that the dispensing opening (8) after dispensing from the forward pressed outer bottom (34) of the outer piston (12) is closed.

2. Internal Tubendosierer according to claim 1, characterized in that in the version in which the outer piston (12) has a piston rod (13), the inner piston (15) a Has bore (14) therefor, wherein the inner piston (15) between two stops (16 and 17) is movable.

3. Internal Tubendosierer according to claim 1 and 2, characterized in that the front outlet opening (8) after donating from the pushed forward outer bottom (34) of the outer piston (12) flush with the outer side (43) of the ring valve (40) is closed.

4. Internal Tubendosierer according to claim 1, 2 or 3, characterized in that the mixing nozzle (30) together with the

Ring valve (40) is made in one piece from a soft plastic or silicone.

5. Internal Tubendosierer according to claim 1, 2 or 3 and 4, characterized in that the mixing nozzle (30) is made together with the annular valve (40) in one piece from a soft plastic or silicone and clamped with bias on the increase (24) ,

6. Internal Tubendosierer according to any one of the preceding claims, characterized in that the mixing nozzle (30) together with the Ringventi! (40) is made in one piece from a soft plastic or silicone, wherein at the end of a clamping ring (45) is integrally formed.

7. Internal Tubendosierer according to any one of the preceding claims, characterized in that when pressure on the tube (2) or the bottle (3), the opening (44) of the annular valve (40) from the outer edges (42) of the dosing sleeve (4) weggefedert is.

8. internal tube dispenser according to one of the preceding claims, characterized in that the inner piston (15) for sealing against the thinner region (13 ') of the Piston rod (13) has a to the interior (11) directed towards cuff (15 ').

9. Internal tube dispenser according to one of the preceding claims, characterized in that on the dosing sleeve (4) approximately in the region (23) behind the transverse opening (6) at a distance (D) to elevations (24) in the form of a mounting sleeve, from Webs or the like are formed, which pinch in the neck (1).

10. Internal Tubendosierer according to any one of the preceding claims, characterized in that the compression spring (19) or the tension spring (19) or a tension compression spring (19) is made of a stainless metal.

11. internal tube dispenser according to one of the preceding claims, characterized in that the compression spring (19) or the tension spring (19) or a tension compression spring (19) made of a plastic or an elastomer is made.

12. Internal tube dispenser according to one of the preceding claims, characterized in that the inner piston (15) is made of an elastomer such as TPE or TPV or of a silicone.

13. A process for the production of an internal tube dispenser according to one of the preceding claims, characterized in that the ring valve (40) is formed in the two-component injection molding process to the mixing nozzle (30).

Internal cream dispenser with collars and spring