reference will now be made in detail to the preferred embodiment of the invention , an example of which is illustrated in the accompanying drawing . it should be noted that the term fluid means every movable medium , which may accomplish the function to be described in connection with the device to be described or similar devices . obviously , the device may be applied to fluids of widely varying viscosities . in the drawing reference numeral 1 designates a container which , as mentioned , may consist of a plastic bag that after having been filled may be closed , such as by folding the upper portion of the bag , and which may thus be used several times . the container or bag 1 has an outlet opening 2 in the lower portion thereof , according to fig1 a portion 2 &# 39 ; of an adapter having the general designation 3 is connected to the wall portion surrounding the outlet opening 2 . in the embodiment shown the adapter has an upper flange 4 , a tubular portion 5 projecting downwardly therefrom and having a second flange 6 located intermediate the ends of said tubular portion as seen in fig1 . the tubular portion 5 has a circumferential bead 7 in the lower end thereof , for a purpose to be disclosed . reference numeral 8 generally designates a metering chamber preferably made from a resilient plastic material having a thickened portion in the upper portion thereof and defining an upper flange 9 . an annular , relatively deep groove 10 is made in the upper end surface thereof and a circumferential groove 11 is made in one of the walls surrounding said groove 10 . the groove 11 has substantially the same profile as the bead 7 of the adapter . further , the flange has a central through opening 12 . a tubular , thin - walled portion 13 projects downwardly from the thickened portion or flange 9 and the lower open end thereof is connected to a self - closing closure 14 . the self - closing closure , known per se , comprises two members connected to each other along the outer edge portions thereof and one of said members has a relatively rigid , annular portion 15 , to be fixedly and sealingly secured to the tubular portion 13 for instance by means of a plastic welding process . the portion 15 is integrally made with a central , axially projecting pin 18 by means of number of radial spokes 17 or a perforated portion . the second member of the closure is designated by numeral 19 and has a portion 20 surrounding the annular portion 15 and preferably secured to the annular portion 15 or some portion attached thereto and a thin walled portion 21 serving as a diaphragm projects therefrom and has a central outlet opening 22 . as seen in fig1 the diaphragm 21 normally inclines somewhat inwardly and is biassed so that it is resiliently pressed against the pin 18 which thereby sealingly closes the outlet opening 22 . a floating body generally designated by 23 is freely movable in a vertical direction of the metering chamber 8 defined by the tubular portion 13 , flange 9 , and the closure 14 . in the embodiment shown said floating body comprises a cylindrical body conically shaped 24 in the upper end thereof to define a valve cone and which is hollow by a bore or a recess 25 and closed by a plug 26 . the floating body 23 is made from a relatively rigid material , for a purpose to be disclosed . the diameter thereof is somewhat less than the inner diameter of the tube 13 , so that an annular space 27 is defined between the tube 13 and the floating body . also , an annular space 28 is defined between the lower portion of the floating body 23 and the self - closing closure , whereby it is ensured that the interior of the self - closing closure communicates with the interior of the tubular portion 13 . as may be seen in fig1 the adapter serves to releasably connect the portion of the device forming the metering chamber 8 to the container . by making the metering chamber from an elastically yieldable material it is understood , that the portion of the tubular member of the adapter located below the flange 6 , may be pressed into the groove 10 and that a durable and sealed connection is obtained when the bead 7 snaps into the groove 11 . this occurs when the flange 6 contacts said flange 9 . when the container and the metering chamber 8 are filled with fluid the floating body is held in sealing contact with the opening 12 , serving as a valve seat , via the valve cone 24 due to the floating force thereof . similarly , the self - closing closure is closed in the starting position according to fig1 . if the user with one hand seizes the tubular portion 13 and squeezes the hand , the wall 13 will be deformed and the fluid in the metering chamber 8 will be exposed to a pressure which is capable of opening the self - closing closure 14 . thereby , an amount of fluid , proportional to the extent of squeezage made by the manual compression of wall 13 , is pressed out through the outlet opening 22 of the self - closing closure 14 . when the pressure is released , and the hand is removed from wall 13 said wall will return to the initial shape thereof , and the floating body moves towards the idle position thereof , shown in fig2 . now fresh fluid can flow into the chamber 8 from the storage container . the floating body then rises in step with the flowing of the fluid into the metering chamber and when said chamber 8 is filled with fluid , the floating body has reached the operative position thereof shown in fig1 where it seals off the communication between the metering chamber 8 and the storage container . the device is then in its initial position shown in fig1 and ready for new dispensing operations . thus , the function of the structure is very simple . the diameter of the floating body is only slightly less than the inner diameter 13 of the tube 13 , which results in the space 27 being relatively narrow . this results in two advantages . primarily , the pressure which the fluid may exert in the idle position upon the self - closing closure is reduced and , secondly , the maximal deformation of the wall 13 is limited to a preselected value , which is of importance for the proper function of the self - closing closure as it has been shown that the attachment of the diaphragm is of the greatest importance for the operation of the self - closing closure . it is a very thin - walled and resilient member and the slightest irregularity in the shape or tension results in risks for a less efficient operation of the self - closing closure . in case the wall 13 should be permitted to be deformed without limits , this would result in such tensions in the portion of the device to which the diaphragm is attached , that the operation would be hazardous but , also the tube would thereby lose the capacity of returning to the initial shape thereof . however , by the limited deformation according to the present invention , such a risk is eliminated .
a device for dispensing fluid from a container has a tubular and flexible metering chamber , intended to be squeezed by a hand . the metering chamber is closed by means of a self - closing closure , which however opens in response to a predetermined pressure upon the fluid . a floating body housed in said metering chamber limits the squeezing of the metering chamber and breaks , when floating in a sufficient amount of fluid in the metering chamber , the communication between the container and said metering chamber .