CA1165741A

CA1165741A - Pressure can

Info

Publication number: CA1165741A
Application number: CA000376297A
Authority: CA
Inventors: Werner Wobmann
Original assignee: POLYFILL AG fur DICHTUNGSTECHNIKEN
Current assignee: POLYFILL AG fur DICHTUNGSTECHNIKEN
Priority date: 1980-05-12
Filing date: 1981-04-27
Publication date: 1984-04-17
Also published as: WO1981003318A1; IT1137590B; EP0051618A1; CH646390A5; IT8121647A0; BE888368A

Abstract

ABSTRACT OF THE DISCLOSURE
In order to avoid changes of mixtures or compounds in the course of time, at least one component is kept separately and added only when used. In a pressure can one component is enclosed in a container and stored at a location in the range of motion of a dosing valve. For this purpose a sleeve is secured to the valve disk. The sleeve is provided with a shoulder as the support for the container and has an orifice. On pressing the valve in the direction of the container the latter is broken or opened so that the component can be mixed with the component in the can. The valve is first actuated by attaching a removable seal, which is removed after combining the components, whereupon the mixture is ready for processing. This arrangement permits the contents of the can to be stored for any length of time while the readiness for processing is obtained in a very simple manner and the product can be processed by means of the pressure can in a manner which is just as simple.

Description

1 16574 }
The present invention relates to a pressure can compri-sing a container and a dosing valve disposed in an opening of the container and intended for separately receiving components of a mixture.or compound to be dispensed from the pressure can.
The properties of mixturesor compounds may be subject to change or degradation as a function of time. The change or the degradation can be such that the product can be no longer used.
In order to maintain the properties over a long period, the com-ponents causing the change or degradation are stored separately from the other components and they are combined only when the mix-ture or compound is to be used.
The separation of the components is also desireable when they develop special properties, such as forming a foam, on being combined. For this kind of mixture or compound, the components may be stored separately and combined only upon use. For example, polyurethane foams are used in many fields. They consist substan-tially of two fundamental components and small amounts of addi-tives, which are mixed with one of the two components. When the components are combined and thoroughly mixed, the polyurethane foam is formed.
Various systems for dispensing small amounts of these foams available are known. Apart from the simplest system, in which the two components are kept in separate packages, poured to-gether, and mixed for use, a system which causes problems for un-trained personnel since one of the two components requires speci-al precautions to be taken, asystem with one package is known. In ~; this one-package system, the two components are separated by a diaphragm which must be pierced prior to use. Debris from the dia-phragm frequently obstructs the mixing process, impairing the qua-lity of the end product. Furthermore, this system can be emptied only with the aid of an additional device.

All known systems have draw-backs associated either with B :~ ~
, l 16~74 l their handling or storage.
~, According to the present invention there is provided a pressure can for dispensing a mixture or a compound, components of which are stored separately prior to activation, comprising a first container containing one component of said mixture or com-pound, a dosing valve mounted in an opening of the first contain-er, said dosing valve having a tubular extension through which the mixture or compound passes, extending into the first container, a movable valve member, and at least one frangible second contain-er containing another component of said mixture or compound as-sociated with said tubular extension and located such that actua-tion of said valve member causes destruction of said at least one frangible second container to release the contents thereof into the first container.
The present invention will be further described, by way of example only, with reference to the accompanying drawings, in which:-Figure 1 is a diagrammatic longitudinal section of a top portion of a pressure can having a dosing valve for opening a container containing a component of a mixture or compound, the container being located in the paths of the dosing valve;
Figure 2 is a diagrammatic longitudianl section of a container support according to a further embodiment of the pre-sent invention;
Figure 3 is a lateral view of the support shown in Fi-gure 2;
Figure 4 is a diagrammatic longitudinal section of a con-tainer support according to another embodiment of the present in-vention;
Figure 5 is a diagrammatic longitudinal section of a container support according to a still further embodiment of the present invention; and B

1 16$7~

Figure 6 is a diagrammatic longitudinal section of a container support according to another embodiment of the present invention.
In Figure 1, a top portion 1 of a pressure can 2 has a valve disk 4 secured to its edge 3. Both the pressure can 2 and the valve disk 4 are thin-walled parts of metal or plastics.
The valve disk 4 is secured to the edge 3 of the pres sure can 2 by means of a disk edge 5. The disk edge S merges into a short feed pipe 6, boundedby a shoulder 7, which in turn merges into a pipe~like extension part 10, whose diameter is smaller than the diameter of the short feed pipe 6. However, the extension part 10 can also form part of the short feed pipe 6, in which case it has the same diameter. The extension part 10 has a rim bead 11 enabllng a tubular and sleeve-like connecting part 15 to be relia-bly sècured thereto. However, the rim bead 11 can also be con-structed as a thread so that tubular and sleeve-like connecting parts 15 can be screwed to the valve disk 4.
The extension part 10 is bounded by an inwardly directed flange 12, which has an opening 16 and serves for securing a valve 20. The valve 20 is suitably a tilting valve. The valve 20 has a valve body 21 extending through the opening 16 and having an inside valve seat body 22. The valve body 21 also has a spring or guide bearing 23, in which a valve shaft 24 with an axial duct 25 is disposed. The valve shaft 24 has a collar 26, against which the spring or guide bearing 23 of the valve body 21 abuts. The valve shaft 24 also has an inside flange cut-off 27, whose outer edge, together with the valve body 22, seals the valve. Directly at the flange cut-off 27 outlets 28 are disposed in the valve shaft 24. When the valve shaft 24 is tilted, the flange cut-off 27 is lifted from the valve seat body 22 on one side and the contents of the can pass through the outlets 28 into the axial duct 25 and then to the outside. It will be noted that a moving part of the E~

valve 20, in Figure 1 the valve shaft 24 with the valve cut-off 27, projects into the inside of the can 2.
In Figure 1 connecti,pg part 15 is a sleeve 35, whose o~e end has an inwardly drawn-in shoulder 36, forming an orifice 37. The other end of the sleeve 35 is disposed on the ex-tension part 10 and thus retains the sleeve 35 in its position.
However, sleeve 35 may be in the form of a truncated cone, corres-ponding to the dash-and-dot line 38, which is clamped between the edge 3 of the pressure can 2 and the disk edge 5 in order to retain the sleeve 35 in its position in this manner.
A frangible container 40, abuting the shoulder 36, is disposed on the inside of the sleeve 35. The container 40 contains a component of the mixture or compound. It is also possible for the sleeve 35 to extend into more than one container 40. The con-tainer 40 consists of glass or some other material which can be broken or opened, for example, at a rated breaking point. When the valve 20 "';

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is o~ened, the valYe sha~t 2~ is pressed a~ainst the container 40 and the container ~,Qr containerS~ 40 is broken or opened by the flan~e 27. The contents of the eontainer or containers 40 are discharged through the oxifice 37 and combined with the component in the can 2. The container contents can be homo-geneously distributed in the can by shaking to form the desired mixture or compound.
In Figure 2, the connecting part 15 is also a sleeve 35, but in its cylindrical or conical portion it has a double 10 bead 41 anda concavely curved shoulder 36, to which a short feed pipe 42 is connected. A plurality of slots43 are provided in the shoulder 36.
A container 40 is disposed on the seat 44 formed by the short feed pipe 42. In this~case also, several containers 40 can be disposed on the seat. A moving member 45, which, in Figure 2, is a plate 46 havingan opening 47, serves for transmitting the motion of the flange cutof 27 of the valve shaft 24. However, the plate 46 can also have a different shape, for example, it can be cross-shaped or wheel-shaped.
The openings in the moving member 45 serve for the passage of the mixture or compound when the valve 20 is actuated.
When the valve shaft 24 is actuated the plate 46 is pressed agalnst the container 40, which thus is broken or opened. The component passes into the concave portion of the shoulder 36 and, via the openings 43, it combines with the component in the can 2, The slots 43 usuall~ are closed or only slightly opened so that a pressure balance between the can and the inside spa,ce of the sleeYe 35 c~n be attained. When the plate 3Q 46 ~s moyed onto the douhle head 41, the sleeve 35 is defor,med in the ~Qwer re~ion s~ that the slots 43 ,a,re opened. The plate 46 is thus ~etained ~n the bead 41. When the valve shaft 24 1 16574~

is ~u~thex depressed, the pla~te 46 cQ~es to rest on the se~t 44 and is held below the double bead 41.
The adyantage o the stxucture according ta ~igures

2 and 3 lies in the fact that a riser 48 is secured to the short feed pipe 42. This has the result that the contents of the can 2 can be processed in any position. The fact that the plate 46 rests on the seat 44 ensures that no connection exists between the can space and the inside space of the sleeve 35.
A sleeve having a structure similar to that in Figure 2 and 3 is shown in Figure 4. The starting position of the plate 46 and of the container 40 is shown in dotted outline.
When the plate 46 is engaged in the double bead 41, the component flows from the broken or opened container 40 through the open-ings 43. A diaphragm 49 is provided so that the liquid cannot flow off through the short feed pipe 42. When the flow of the component through the opening 43 is completed, the plate 46 is brought into the position shown in Figure 4, i.e., below the double bead 41, in which it closes the openings 43.
When upon completion of the mixing of the components, the contents of the can 2 are processed, the diaphragm 49 is de-stroyed by the internal pressure of the can and the processing of the can contents can be carried out. It is self-evident that the container 40 is destroyed or opened with the dosing valve 20 closed, i.e., the outlet duct of the valve. In Figure 1, the axial duct 25 is closed by a removable seal (not shown in detail),. Onl~ when the mixing of the components is completed iS this se,a,l det,a,ched, whexeupon the diaphragm 49 iS de~t~o~e,d when the yalye is ope,ned, In Pl;gu~e 5 the c~nta,~nex 40 i~, a, holl~w ring~
3Q dispo,~ed ~n the peripher~ of the connecting part 15, On the inside ~ the connect~n~ paxt 15 the moving part 45 is a xoo~-shaped plate 51 provided with openings 5Q. Beads 52 and 53, against which the container 40 and the plate 51 abut, are provided on the connecting Rart 15 on the inside and on the periphery, ~hen the flange cutoff 27 of the valve shaft 24 is moved down~ards, the cylindrical connecting part 15 is spread apart, whereby the container 40 is bxoken for example, when it is made of glass, or opened. In the structure accordlng to Figure 5 it is also possible to arrange several containers 40 on the periphery of the connecting part 15. The advantage of this embodiment lies in the fact that the upper empty space 10 of the can 2 can be kept relatively small. The component flowing out of the container 40 can be mixed with the other component by shaking the can 2. In this structure (see Fig.
S) a r'iser 48 can also be used.
In Figure 6 the connecting part 15 comprises a roof-shaped plate 55 whose ends extend through openings 56 in the wall of the connecting part 15. When the flange cutoff 27 presses on the bar 55, the connecting part 15 is spread apart by cams 57, whereby the external container 40 is broken or opened.
The connecting part 15 is preferably made of a suitable plastic material, which is sufficiently non-deformable to cause the destruction or opening of the container 40.
However, it is possible to deform the connecting part 15 by means of the moving member 45 so that the container 40 can be broken or opened. The slots 43 can be opened with the aid of the double beads 41. The MoVing member 45 also is desirably made of plastics, while the container 4~ may be made fro~ ~l,a,s,,s oX pl~sticS.

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A pressure can for dispensing a mixture or a com-pound, components of which are stored separately prior to activa-tion, comprising a first container containing one component of said mixture or compound, a dosing valve mounted in an opening of the first container, said dosing valve having a tubular extension through which the mixture or compound passes, extending into the first container, a movable valve member, and at least one frangi-ble second container containing another component of said mixture or compound associated with said tubular extension and located such that actuation of said valve member causes destruction of said at least one frangible second container to release the con-tents thereof into the first container.

2. A pressure can according to claim l, wherein the tu-bular extension has a shoulder defining an opening which is ob-structed by the frangible second container and which is freed upon destruction thereof to allow passage of the mixture or compound therethrough.

3. A pressure can according to claim 2, comprising on the inside of the tubular extension a double bead for retaining a displaceable member for destroying the frangible second container.

4. A pressure can according to claim 3, in which open-ings are provided in the inside shoulder of said connecting part to allow the component in the frangible second container to pass therethrough into the first container upon destruction of the se-cond container.

5. A pressure can according to claim 1, in which the frangible second container is in the form of an annulas disposed on the external wall of the tubular extension.

6. A pressure can according to claim 1, comprising a movable plate having openings therein and provided in said tubular extension, which upon actuation of the movable valve member de-stroys the frangible second container.

7. A pressure can according to claim 5, in which a pitched roof-shaped member, which abuts the wall of the tubular extension in the region of the second container, is provided to destroy the second container upon actuation of the valve member.