DE102007044180A1 - Self-closing dispensing head - Google Patents

Abstract

The invention relates to a self-closing dispensing head 1 for a pressure vessel with a dispensing valve for dispensing media, in particular viscous, self-foaming and / or gelatinous products, wherein the dispensing head a closable by a closing element discharge opening 3, an opening mechanism through which in the assembled state Dispensing valve of the pressure vessel can be opened and has an opening into the discharge port 3 channel for the medium, wherein the channel has a first channel section 4 and a second channel section 5 and wherein actuated by pressure on an actuating element 7, both the opening mechanism and the closing element and the second channel section 5 are moved relative to each other such that the dispensing opening is releasable. In order to close the discharge opening safely without the risk that a remnant medium to be dispensed there remains, it is provided that the closing element is designed as a movable closing piston with on its piston skirt surface spaced apart and movable with the closing piston 6 Zentrieransätzen 6.2, wherein between individual Zentrierätzen 6.2 flow-through 6.3 are provided for the medium.

Description

The The invention relates to a self-closing dispensing head for a pressure vessel with a dispensing valve for dispensing media, in particular viscous, self-foaming and / or gel-like products, wherein the dispensing head by a a closing element closable dispensing opening, an opening mechanism through which mounted in Condition the discharge valve of the pressure vessel open and opening into the dispensing opening Channel for the medium, wherein the channel has a first Channel portion and a second channel portion and wherein by pressing on an actuator both the opening mechanism operated as well as the closing element and the second Channel section relative to each other are moved so that the discharge opening is releasable.

pressure vessel with dispensing heads for z. B. shaving foams and gels of conventional design usually have a non-closable dispensing opening so that it often comes after use, that despite no more activated actuators nachfließt the medium or nachschäumt, resulting in unsightly residues in the field the dispensing opening leads to dry out and when reused, the newly applied, fresh medium contaminate. In addition, the discharge opening often clogged due to dried up and clogged residual medium.

To avoid these disadvantages is out of the EP 1 295 812 A1 a self-closing dispensing head for a pressure vessel of the type mentioned, in which the dispensing opening can be closed and opened via a closing element. When pressure is applied to an actuating element, both the opening mechanism are actuated and the closing element and the second channel section are moved relative to one another. Thus, on the one hand, the dispensing valve is opened, so that the pressurized medium can flow into the channel. There, however, it can only exit via the dispensing opening when the closing element has released the second channel section. By spring means, z. B. by a partially elastically deformable shaped housing of the dispensing head, the respective elements with decreasing pressure on the actuator can be brought back into their original position relative to each other and to the pressure vessel, so that both the dispensing valve and the dispensing opening are closed again. In order for a Nachfließen or Nachschäumen is effectively met.

adversely In this case, however, that in the region of the discharge opening Remaining residual amounts of the medium to be dispensed remain. Of Further, the safe closing of the dispensing opening prepares problems.

As a result, It is an object of the present invention, a self-closing Dispensing head for a pressure vessel of the beginning so-called type such that remaining amounts of the effectively avoid dispensing material and the dispensing opening are safe to close.

to Solution of this task is the self-closing Dispensing head for a pressure vessel of the beginning mentioned type characterized in that the closing element as a movable closing piston with on its piston skirt surface provided at a distance from each other and with the closing piston is formed movable centering approaches, wherein between individual centering approaches throughflow chambers intended for the medium.

In order to is a self-closing dispensing head for one Pressure vessel created, with the very clean a medium is to be delivered. This is particularly due to that due to the provided centering approaches, located in the second channel section on the inner surfaces during the entire movement of the closing piston both at transfer to its open position as well as when transferred to its closed position support, relative positional deviations of the closing piston are safely avoided over housing parts, which causes that compared to the previously known State of the art no position inaccuracies during the closing process occur in the region of the outlet opening, so that the Locking piston reproducible and accurate in its opening and its closed position are transferred can. This causes that still in the exit opening Remaining residues safely into the first channel section at transfer of the closing piston from its open position in the closed position can be returned. This remains at the outer region of the discharge opening the output head at best only small remnants of the output Medium that can be used by the user with simple means, eg. B. by simple Wipe off with your finger or rinse off. The risk of clogging the discharge opening is so certainly encountered.

Since there are flow-through spaces between the individual centering approaches, the delivery of the medium is not hindered. The same applies to the return of a medium after decreasing pressure on the actuator and a movement of the closing piston in its closed position. In order to have an evenly distributed over the circumference centering, the centering lugs are preferably distributed over a peripheral portion evenly distributed on the closing piston. It has been found that z. B. four Zentrieransät ze, which are evenly distributed over the circumference, allow a positionally accurate movement and centering of the closing piston. It should be ensured hereby that during the entire closing movement no tilting moments are possible over the length of the closing piston, so that the centering elements on the closing piston extend near its front end. For this purpose, the front end may also have a cross-sectional widening, which extends over the circumference of the closing piston, so that it has an enlarged peripheral portion there, on which the centering elements are arranged. This also means that there is an increase in the flow rate of the medium to be dispensed.

Especially preferred is at the front end, d. H. the end of the closing piston, which faces the discharge opening, a sealing element molded, preferably via an inner central supply channel within the closing piston and perpendicular thereto, opening into the lateral surface of the closing piston Supply lines. Such a sealing material exists z. B. from a plastic soft material such. B. TPE, silicone. The closing piston can z. B. from ABS, PP or POM material, each plastic hard materials exist.

Around Furthermore, the return of tax material to favor the second channel section has a valve seat, in the closing piston with the sealing element in his Fully closed position is complete. With a slight oblique orientation of the closing piston to the horizontal is taking a position, with an upper Area of the output side end of the closing piston with but spaced apart from the discharge port end otherwise not more about the case of the Dispensing head protrudes in the region of the dispensing opening. Prefers takes the closing piston a position in the valve seat, that its front End flush with the outer surface of the housing completes so that product remains easily removed can be. This can be very clean there still adherent Material over the seal and the valve seat in the side channel section be returned.

Further advantageous embodiments of the invention will become apparent from further Subclaims, the following description and the Drawing. In the drawing show:

1 an embodiment of an output head (schematically with insight into the interior) in the closed state of the closing piston;

2 one too 1 analogue representation with opened closing piston;

3 Enlarged section of a cross-sectional view of the dispensing head of the embodiment according to 1 in the region of the discharge end and the closing piston;

4 one too 3 analogue representation with opened closing piston;

5 the representation after 3 with alignment of the closing piston;

6 a cross-sectional view according to the cross-sectional line VI / VI in 5 ;

7 increases the discharge opening facing away from the end of the closing piston with spring element and actuator;

8th a single representation of a closing piston (cut open), with inner channel for injection molding of the front seal and the spring element.

In the drawing, basically equivalent parts are provided with matching reference numerals. General with 1 is the dispensing head numbered, which is preferably formed integrally with the pressure vessel, not shown. This one has a housing 2 and a dispensing valve not shown in detail for dispensing media, such as viscous, self-foaming and / or gelatinous products. This dispensing valve is associated with the inner container space in which the medium is filled, and can be operated by an opening mechanism.

The dispensing head has a dispensing opening which extends over a first channel section 4 and a second channel section 5 is in flow communication. The second channel portion is associated with the locking element designed as a closing piston, which is the discharge opening 3 controlled. This closing piston is relatively movable within the channel section 5 arranged so that it from its closed position ( 1 ) in its open position ( 2 ) can be moved.

To perform this movement is an actuator 7 provided from his / her rest position ( 1 ) Can be pressed into the operating position and thus can be pivoted. This actuator 7 simultaneously actuates the opening mechanism with which the dispensing valve can be opened.

As in particular closer from the 3 . 4 . 5 . 6 and 8th are apparent in the front region of the closing piston 6 at a section 6.1 Centering projections 6.2 formed on the inner circumferential surfaces of the second Kanalab -section 5 support in the housing. In the embodiment shown, a total of four centering approaches 6.2 evenly distributed over the circumference. In the front area of the second channel section 5 ie in its end area, which is in the exit opening 3 opens, in the housing is a valve seat 3.1 educated. This valve seat is the front area of the closing piston 6 associated with a molded plastic soft material seal 8th is provided. The front head section 6.4 of the closing piston 6 has one of the conical shape of the valve seat following congruent trained design and is to fully contribute to the valve seat, as closer 3 shows. It takes in the 3 apparent upper part a distance to the exit opening 3 (whose front end) a. Nevertheless, he is a total sunk arranged in the closed state, so that any remaining amounts of the spent medium are wiped with a finger prick and then with a simple rinsing and the still accessible from the outside valve rinse off. This is certainly avoided that residual amounts that can dry out and clump, in the output port 3 remain. By the return movement of the closing piston out of his 4 apparent opening position in the closed position in 3 results in that even remaining residues with in the inner channel section 5 be returned.

That of the dispensing opening 3 opposite end of the closing piston has a spring element 9 made of a plastic soft material that is the actuating element 7 out with a head piece 10 is provided, which has a rounded sliding surface 10.1 having. The spring element 9 is at the same time a sealing element, so that the product mass can not leave the container there. The actuating element has a correspondingly congruent contact surface 7.1 in the course of the operation, ie depression of the actuating element 7 on this surface 10.1 slides. Due to the rounding there are only relatively low frictional forces, which also means that no tilting moments are transmitted to the closing piston as in the prior art. Furthermore, the desired near-horizontal position of the closing piston can be realized, although it is acted perpendicular to the actuating element. Due to the low frictional forces, the reduced tilting moments and the provided centering lugs 6.2 is the closing piston very precise position in the respective open or closed position to transfer, which leads to an optimized sealing behavior and taking the closed position with superimposed return of the medium. In 8th is the inner channel 6.5 seen in the transverse channels 6.6 for injecting the seal 8th and the spring element 9 lead.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - EP 1295812 A1 [0003]

Claims (8)

Self-closing dispensing head ( 1 ) for a pressure vessel with a dispensing valve for dispensing media, in particular viscous, self-foaming and / or gel-like products, wherein the dispensing head has a dispensing opening closable by a closing element (US Pat. 3 ), an opening mechanism through which in the assembled state, the discharge valve of the pressure vessel can be opened, and one in the discharge opening ( 3 ) channel for the medium, wherein the channel at least a first channel section ( 4 ) and a second channel section ( 5 ) and wherein by pressure on an actuating element ( 7 ) actuates both the opening mechanism and the closing element and the second channel section ( 5 ) are moved relative to each other such that the discharge opening ( 3 ) is releasable, characterized in that the closing element as a movable closing piston ( 6 ) provided with on its piston skirt surface at a distance from each other and with the closing piston ( 6 ) movable Zentrieransät zen ( 6.2 ) is formed, wherein between individual centering inserts ( 6.2 ) Flow chambers ( 6.3 ) are provided for the medium. Self-closing dispensing head according to claim 1, characterized in that the centering lugs ( 6.2 ) evenly over the circumference of the closing piston ( 6 ) are provided distributed on the lateral surface thereof. Self-closing dispensing head according to claim 1 or 2, characterized in that the longitudinal central axis of the closing piston ( 6 ) is oriented so that it has an angle α of <15 ° to the horizontal. Self-closing dispensing head according to one of claims 1 to 3, characterized in that at the dispensing opening ( 3 ) facing away from the end of the closing piston ( 6 ) an elastic spring area ( 9 ) is provided, the end of one with the actuating element ( 7 ) related head piece ( 10 ) is limited. Self-closing dispensing head according to claim 4, characterized in that the head piece ( 10 ) has a rounded cross-sectional shape. Self-closing dispensing head according to claim 5, characterized in that the actuating element ( 7 ) during the opening and closing movement of the closing piston ( 6 ) on the rounded head piece ( 10 ) slides in the open or closed position, wherein the rounding of the head piece ( 10 ) to the movement path of the actuating element ( 7 ) is adjusted. Self-closing dispensing head according to one of claims 1 to 6, characterized in that the closing piston ( 6 ) one with a molded seal ( 8th ) has a header made of a plastic material and the second channel section ( 5 ) a valve seat ( 3.1 ), in which the closing piston ( 6 ) with the sealing element ( 8th ) for taking the closed position completely or at least a partial distance from the front output end of the discharge opening ( 3 ) is insertable. Self-closing dispensing head according to claim 6 or 7, characterized in that the closing piston ( 6 ) a central line and in the region of the sealing element to be provided with the outer surface of the closing piston ( 6 ) aligned, opening into the central opening channel branch lines for injecting the soft seal element ( 8th ) is provided.