Pump device for a container for liquid, pasty or foamable cleansing and skin care preparations

Abstract

The subject matter of the invention is a pump device for a container for liquid, pasty or foamable skin care preparations, e.g. for liquid soaps, disinfectants, skin protection pastes or creams, wherein the pump device comprises a conically tapering bellows, wherein the bellows exhibits several bellows elements each having a different diameter, wherein at least one smaller bellows element can be pushed into an adjacent larger bellows element.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority of German Patent Applications DE 10 2011 014 169.3-16 filed Mar. 16, 2011; DE 20 2011 100 895.2 filed May 19, 2011; and DE 20 2011 105 790.2 filed Sep. 16, 2011, the contents of which are incorporated herein by reference.FIELD OF THE INVENTION[0002]The invention relates to a pump device for a container for liquid, pasty or foamable skin care preparations, e.g. for liquid soaps, disinfectants, skin protection pastes or creams, wherein the pump device comprises a conically tapering bellows, wherein the bellows exhibits several bellows elements each having a different diameter. The skin cleansing preparations can in this connection also contain abrasive bodies.BACKGROUND OF THE INVENTION[0003]Pump devices of the type initially mentioned are sufficiently well known from the prior art. These pump devices are also referred to as suction pumps and in particular as bellows pumps. They are arranged on a container, ...

AI Technical Summary

Benefits of technology

[0010]In order to prevent the bellows elements of the bellows from getting out of control, i.e. to prevent a pushing in of the individual bellows elements beyond their dead center position, provision is made that the base element and / or the wall element are constructed diamond-shaped, square or rectangular in cross-section. In particular in this connection the film hinge in extended state of the bellows connects the base and wall element via the shortest distance between base and wall element. It is additionally advantageous in this connection if the cross-section of the annular base element corresponds approximately to the radial distance between two wall elements, thus in particular the cross-section is not smaller, but rather larger; this measure likewise prevents the “bellows elements of the bellows from getting out of control.” During compression the following then happens: The respective annular base element swivels by circa 90° and abuts with one of its surfaces the upper and lower wall element. The individual bellows element remains in this position, but it can be transferred back to the extended position with a minimum expenditure of force. In this connection there is no risk that the bellows elements will be compressed beyond their dead center position with normal expenditure of force, because this could result in damage to the film hinges.

[0013]In this respect the bellows can for example be completely compressed, which in addition to the actual pumping operation if applicable also offers advantages in the case of transportation, to be precise insofar as then the pump device only takes up relatively little space, or it is compressed in the state in which it is placed on the container by precisely the amount which is necessary to facilitate the insertion of the container together with the pump device into the dispensing device in simple fashion, as has already been described.

[0018]According to a second embodiment the outlet valve is constructed as a disk valve and arranged liquid-tight in the outlet connector of the bellows. This disk valve in particular features a valve body, wherein the valve body receives a valve disk through a neck at a distance from the valve body, said valve disk abutting on the outlet connector in radially moveable fashion. From this it is clear that when the bellows is compressed the valve disk forms a radial distance to the outlet connector for the passage for example of the liquid soap. In this connection in addition in particular provision is made that the valve disk exhibits a circumferential rotating sealing lip which is arranged on the neck running in the direction of the neck. That means that the sealing lip of the valve disk runs obliquely, in particular at an angle of circa 45° cm to the connection nozzle. Through the selection of the inclination of the sealing lip consequently the selection of the work angle of the sealing lip to the wall of the connection nozzle support, the force necessary so that in the compression of the bellows the sealing lip swivels radially inward, thus to the neck can be influenced, and hence offers a passage for the medium located in the bellows chamber. It also turns out that in the oblique alignment of the sealing lip to the inside wall of the connection nozzle in the initial state of the bellows the sealing lip abuts with a sufficiently high pressure on the inside wall of the connection nozzle in order to prevent an unintended overrun of the medium located in the bellows chamber of the bellows, for example a liquid soap.

[0019]In this connection it turns out to be advantageous if in the transition from the neck to the valve disk a tangential circumferential groove is provided in order to facilitate the swiveling of the sealing lips for release of the passage for e.g. a hand wash paste.

[0023]It has already been pointed out elsewhere that the container holds liquid, pasty or also foamable cleansing and skin care preparations. In particular in the case of the pasty masses in the container, that e.g. skin protection pastes or creams a decomposition of the solid from the liquid portion of the pasty mass was detected in the pumping. In the course of such investigations it turns out that the reason for this lies in too low of vacuum in the pumping operation. To increase the vacuum according to a special feature of the invention it is in this respect proposed that the valve cover exhibit a valve ceiling which receives the inlet valve and which in the direction of the bellows is discharged in cascading manner into the bellows chamber formed by the bellows. Through the minimization of the dead space the vacuum is increased in the pumping operation.

Problems solved by technology

In this connection there is no risk that the bellows elements will be compressed beyond their dead center position with normal expenditure of force, because this could result in damage to the film hinges.

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