Two-component pressurized can

Abstract

A two-component pressurized can having a body, a dome, a valve arranged in the dome, an inwardly curved bottom, an upper chamber and a lower chamber for a first and a second component, which chamber are separated from one another by a separating element, and an opening device which is arranged in the bottom, can be activated from outside and, upon actuation, removes the separation between the chambers for the first and second component, wherein the separating element between the chambers is a piston which is mounted so as to be displaceable in the pressurized can and which has at least one opening closed by a closure element, and the opening device has an opening element which extends through a passage in the bottom and is suitable for separating the closure element from the at least one opening of the piston.

Claims

1. A two-component pressurized can having a body, a dome, a valve arranged in the dome, an inwardly curved bottom, an upper chamber and a lower chamber for a first and a second component, which chambers are separated from one another by a separating element, and an opening device which is arranged in the bottom, can be actuated from outside and, upon actuation, removes the separation between the chambers for the first and second component, wherein the separating element between the chambers is a piston which is mounted so as to be displaceable in the pressurized can and which has at least one opening closed by a closure element, and the opening device has an opening element which extends through a passage in the bottom and is suitable for separating the closure element from the at least one opening of the piston.

2. The pressurized can as claimed in claim 1, wherein the closure element is a membrane, a cover or a plug.

3. The pressurized can as claimed in claim 1, wherein the piston has a plurality of concentrically arranged openings.

4. The pressurized can as claimed in claim 1, wherein the closure element is a plug which is sealingly fitted into the at least one opening.

5. The pressurized can as claimed in claim 4, wherein the plug closes the at least one opening from the side facing toward the lower chamber.

6. The pressurized can as claimed in claim 1, wherein the opening element is a pull wire.

7. The pressurized can as claimed in claim 6, wherein the pull wire has two spaced-apart drivers, of which the lower one acts on the closure element and the upper one acts on the piston.

8. The pressurized can as claimed in claim 1, wherein the piston has, on the wall side, at least one flexible sealing lip.

9. The pressurized can as claimed in claim 8, wherein, as viewed in cross section, the piston has two dovetail-like sealing lips.

10. The pressurized can as claimed in claim 1, wherein the bottom has a crimped-in bottom plate with the passage for the opening element.

11. The pressurized can as claimed in claim 10, wherein the passage takes the form of a sleeve for the opening element and has at least one sealing element.

12. The pressurized can as claimed in claim 1, wherein the opening device has a pull wire with drivers for the closure element and for the piston, and a handle, wherein the handle is arranged outside the pressurized can and below the bottom.

13. The pressurized can as claimed in claim 1, wherein the piston has the form of an inverted cup whose interior is configured dimensionally such that it can receive within it the passage arranged on the bottom of the pressurized can.

Description

(1) The invention will be explained in more detail by means of the appended drawings, in which:

(2) FIG. 1 shows the lower part of a pressurized can according to the invention before activation; and

(3) FIG. 2 shows the pressurized can from FIG. 1 after activation.

(4) FIG. 1 is a longitudinal section showing the lower part of a pressurized can according to the invention with the piston and the opening device. The upper part (not shown) has a customary design and largely corresponds to the upper part of the pressurized can described in WO 85/00175 A. The pressurized can according to the invention differs from this prior art in that the second component is not accommodated in an inner sleeve on the can bottom, but in a second chamber below the movably arranged piston.

(5) The two-component pressurized can 1 according to the invention consists of a body 2, a dome (not shown), a valve (likewise not shown) arranged in the dome, an inwardly curved bottom 3 and an opening device 4 which can be actuated through the bottom from outside. The opening device 4 consists of a pull wire 5, a passage element 7 crimped into a bottom plate 6, a handle 8, which is arranged below the bottom 3 and is situated outside the pressurized can 1, and two drivers 9 and 10 which are situated in the upper region (valve-side region) of the pull wire 5. These drivers 9 and 10 are fixedly connected to the pull wire 5.

(6) Within the pressurized can 1 there is situated the piston 11 which subdivides the inner space of the pressurized can 1 into a lower chamber 12 and an upper chamber 13.

(7) The outer edge of the piston 11 is formed by 2 sealing elements 14a and 14b which bear tightly against the inner side of the can body 2. The sealing lips 14a and 14b are spread in dovetail fashion and are supported sealingly on the inner wall of the can body 2.

(8) The piston 11 itself consists, in its central part, of a cup-shaped structure 15 with a roof 16 and a laterally extending edge or collar 17 which terminates in the sealing lips 14a and 14b. Within the roof 16 there are arranged openings or apertures 18, of which two are illustrated. Further ones can extend concentrically around the piston middle.

(9) In the nontriggered (nonactivated) state of the pressurized can, the openings 18 are closed by a plug 19 which projects into the piston 11 from below and which has a plurality of prongs 20. A prong 20 is provided for each opening 18. These prongs 20 are sealingly fitted to the openings 18, with the result that a passage of the first component contained in the upper chamber 13 into the lower chamber 12 or of the second component contained in the lower chamber 12 into the upper chamber 13 is ruled out.

(10) The pull wire 5 is led, on the one hand, through the cover 19 and, on the other hand, through the roof 16 of the piston 11. Here, in each case, the leadthrough through the roof 16 is of sealing design, with the result that, here too, an exchange of the components contained in the two chambers can not take place. Where the components contained in the chambers are reactive with one another, sealing is brought about in any case by contact of the components in the region of the leadthrough through the roof 16.

(11) The pull wire 5 has the drivers 9 and 10 spaced apart from one another with the upper driver 9 being situated in the upper chamber 13 and the lower driver 10 situated in the lower chamber 12, but above the plug 19 in a recess. The spacing between the drivers 9 and 10 is such that, upon triggering the pressurized can by way of the pull wire, first of all the cover 19 is pulled away from the openings 18, with the result that the path between the two chambers 12 and 13 becomes free. Only in a second step, with the pull wire 5 pulled out further, does the piston 11 move in the direction of the can bottom 3. As a result, the volume of the lower chamber 12 is reduced in favor of the upper chamber 13, which forces the content of the lower chamber 12 into the upper chamber 13. The multiplicity of the openings 18 brings about good distribution and mixing in the upper chamber 13 of the second component contained in the lower chamber 12.

(12) The cup-shaped configuration of the piston 11 takes account of the configuration of the passage 7 which is arranged in the can bottom 3, of the opening device 4. This ensures substantial residual emptying of the lower component into the upper chamber 13.

(13) The passage 7 of the opening device 4 is crimped into a bottom plate 6, which in turn is crimped with the bottom 3 of the pressurized can 1. It goes without saying that the passage contains at least one sealing element 21 which prevents liquid escaping from the lower chamber 12 to the outside. This sealing element can be present for example in the form of a rubber plug 21 which has a central bore and tightly encloses the pull wire 5.

(14) On the valve side, the passage 7 has a spring element 22 which, after triggering the pressurized can, is intended to resiliently cushion the pulled-down cover/piston.

(15) The body 2 of the can 1 can be manufactured from aluminum and, in this case, has no seam. In that case, no sealing problem arises between the piston and body. In the case of welded cans, however, unevennesses can occur in the region of the weld seam, and therefore, in this case, an inner coating of the can that is known in and of itself may be expedient.

(16) In the nonactivated state, the pressurized can according to the invention can be stored over a long time, because the two components in the chambers 12 and 13 are hermetically enclosed therein. It is only by triggering that the pressurized can is activated. For this purpose, the pull wire 5 is pulled downward with the aid of the handle 8, which releases the plug 19 in a first step and, in a second step, moves the piston 11 by way of the driver 9 toward the bottom 3 of the can 1.

(17) FIG. 2 shows the pressurized can 1 corresponding to FIG. 1 after triggering. The piston 11 has been pulled in the direction of the can bottom 3 with the aid of the guide wire 5 and the driver 9 and is situated in its lowermost bottom-side position. The driver 9 lies directly on the piston roof 16. The lower chamber 12 has been reduced apart from a residual volume in the region of the piston cup 15, and the content of the lower chamber 12 flows (arrows) into the upper chamber 13. The cover 19 has been separated from the piston roof 16 and has freed the openings 18. The sealing lips 14a and 14b are likewise situated in their lowermost bottom-side position; this time, however, they no longer have a function. However, the lower sealing lip 14b ensures, by way of its abutment on the lower end of the body 2 or on the can bottom 3, that the piston cup 15 does not touch the opening device.