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 and an opening device which is arranged in the bottom and can be actuated through the bottom from the outside, in which the can body has a peripheral necking to which there is secured a separating disk which divides the can into a lower chamber and an upper chamber, wherein the separating disk has a central opening which is closed by a closure element, and wherein the opening device can be moved against the closure element via the triggering member in order to detach the closure element from the separating disk.

Claims

1. A two-component pressurized can having a body, a dome, a valve arranged in the dome, an inwardly curved bottom, and an opening device which is arranged in the bottom and can be actuated from the outside, wherein the can body has a peripheral necking to which there is secured a separating disk which divides the can into a lower chamber and an upper chamber, the separating disk has a central opening which is closed by a closure element, and the opening device can be moved against the closure element via a triggering member in order to detach the closure element from the separating disk.

2. The pressurized can as claimed in claim 1, wherein the separating disk is curved into the upper chamber.

3. The pressurized can as claimed in claim 1, wherein the separating disk has a collar which delimits the central opening.

4. The pressurized can as claimed in claim 1, wherein the central opening is circular in form.

5. The pressurized can as claimed in claim 1, wherein the separating disk has a peripherally extending groove which interacts with the necking.

6. The pressurized can as claimed claim 1, wherein the separating disk consists of a pressure-resistant plastic.

7. The pressurized can as claimed in claim 1, wherein the closure element takes the form of a membrane, plug, or cover and is applied in the upper space to the central opening.

8. The pressurized can as claimed in claim 7, wherein the membrane is adhesively bonded or welded to the separating disk or else is integrally formed with the separating disk.

9. The pressurized can as claimed in claim 8, wherein the membrane is integrally formed with the separating disk and has predetermined breaking points.

10. The pressurized can as claimed in claim 7, wherein the plug is fitted sealingly into the central opening.

11. The pressurized can as claimed in claim 10, wherein, for sealing purposes, the plug has a peripheral O-ring.

12. The pressurized can as claimed in claim 1, wherein the opening device has a plunger which, upon triggering of the opening device, acts against the closure element.

13. The pressurized can as claimed in claim 12, wherein the opening device has a triggering pin which is resiliently mounted in a spring cage arranged centrally in the bottom, can be actuated by the triggering member, and is suitable for displacing the plunger vertically against the closure element.

14. The pressurized can as claimed in claim 1, wherein the opening device has a screw rod which is mounted in a thread and extends through the inwardly curved bottom.

15. The pressurized can as claimed in claim 14, wherein a threaded block is arranged in the bottom of the pressurized can.

16. The pressurized can as claimed in claim 14, wherein the closure element has a threaded block into which the threaded rod is screwed such that, upon actuation of the threaded rod, the closure element is separated from the central opening of the separating disk.

17. The pressurized can as claimed in claim 16, wherein the closure element is a plug which is prevented from rotating in the central opening by an arresting means.

Description

(1) The invention will be explained in more detail by the appended drawings. Identical reference signs designate elements having the same function. In the drawings:

(2) FIG. 1 shows a pressurized can with inner sleeve according to WO 85/00157 A;

(3) FIG. 2 shows a portion of a pressurized can according to the invention with the relevant features;

(4) FIG. 3 shows a spring cage as can be used according to the invention;

(5) FIG. 4 shows the lower part of the pressurized can according to the invention from FIG. 2;

(6) FIG. 5 shows a second variant of an opening device according to the invention with closure element; and

(7) FIG. 6 shows a variant of the separating disk according to the invention.

(8) FIG. 1 shows a pressurized can according to WO 85/00157 A having a body 2, which is closed at the upper end by a dome 3. The dome 3 has a flanged edge which connects the dome and body to one another and simultaneously produces a sealed connection of the parts. The dome 3 is produced from a round plate and a shaped part which is cut from sheet metal and which has acquired the curved shape visible from the drawing by forming. The inner edge of the dome 3 is for its part flanged and receives a valve disk with a valve 4.

(9) The bottom 5 is likewise connected to the body 2 via a flanged edge and has in is its center a bottom plate 6 above which the inner sleeve 7 is situated. The inner sleeve 7 has a cover 8 which can be ejected. Within the inner sleeve 7 there is situated a plunger 9 whose end is guided out of the pressurized can through a sealing element 10 at the bottom. On both sides of the sealing element 10, the plunger has boundary elements, both of which act against the sealing element 10 and delimit the free displacement length of the plunger 9 within the inner container 7. Ejection of the cover 8 from the inner container 7 occurs by the plunger 9 being pressed in by striking the can bottom onto a firm surface and being moved in an upward motion. The rubber-elastic sealing element 10 absorbs this upward motion and, after the cover 8 has been ejected, returns the plunger 9 into its starting position.

(10) The operating principle of the pressurized can shown in FIG. 1 also applies to the pressurized can according to the invention, with the rubber-elastic sealing element 10 being replaced by a spring cage and the inner sleeve being replaced by the separated-off space below the separating disk. However, in principle, the use of a plunger 9 together with a rubber-elastic sealing element 10 is also possible according to the invention.

(11) FIG. 2 shows the lower part of a pressurized can according to the invention in longitudinal section with the body 2, the bottom 5 and the bottom plate 6. The body 2 has a peripheral necking 15 which serves as retention for the separating disk 14. The separating disk 14 separates the can interior into a lower chamber 11 and an upper chamber 12.

(12) The separating disk 14 is curved into the upper chamber 12. Since the upper chamber 12 generally has a higher pressure than the lower chamber 11, the inward curvature serves to increase the pressure resistance.

(13) The separating disk 14 has in its edge region 41 a thickening into which a groove 42 is incorporated. This groove 42 serves to receive the necking 15, with it being possible for a flat seal or an O-ring (not shown) to be placed between the upper chamber 12 and the lower chamber 11 in order to increase the sealing tightness.

(14) The separating disk 14 has a central opening which is circular as a rule. Along is the opening there is situated a collar 43 which runs around and, on the one hand, serves for reinforcement and stiffening in the region of the opening and, on the other hand, increases the contact area for the plug 8. The plug 8 is fitted into the central opening and, for sealing purposes, has a peripheral O-ring 81 which acts against the inner edge of the separating disk 14.

(15) The plug 8 itself has a central bore or receptacle 82 into which the valve-side end of the plunger 9 projects. The plunger 9 itself is in contact with the triggering pin 91, which is arranged substantially within the spring cage 16 and projects out of the bottom by its bottom-side end 92. A triggering member 93 engages around the bottom-side end 92 of the triggering pin 91 in such a way that, upon forceful striking of the can onto the bottom, the pin is pressed inwardly, and the force is transmitted to the plunger 9, which releases the plug 8 from its retention in the opening of the separating disk 14. The triggering member 93 takes the form of a knob whose receptacle for the end 92 of the triggering pin 91 is dimensioned in such a way that it limits the pressing-in of the triggering pin 91 to a defined length.

(16) The spring cage 16 itself is anchored in the bottom plate 6, with the bottom part 6 being crimped with the can bottom 5 and the can bottom 5 being crimped with the body 2. The spring cage 16 itself is illustrated in one possible variant in FIG. 3.

(17) FIG. 3 shows in detail the bottom plate 6 together with the crimped-in spring cage 16, with spring elements 17 arranged therein and with the triggering pin 91.

(18) The bottom plate 6 has peripherally a crimp projection 6a and centrally a formation 19 which is oriented toward the outside of the can and within which the spring cage 16 is crimped in. In this formation 19, which has a central aperture, there is situated a sealing disk 20 against which the bottom-side end 31 of the spring cage 16 acts. The spring cage 16 has, at its valve-side end, a membrane 24 and the projection 21 which runs around on the inside and against which the helical spring 17 acts.

(19) The membrane 24 is adhesively bonded to the spring cage 16. Alternatively, an overcoat can also be stretched over the valve-side end of the spring cage 16.

(20) Within the spring cage 16 and the helical spring 17 there is arranged the triggering pin 91 whose valve-side end 29 is arranged directly below the membrane 24. The helical spring 17 is supported, at its valve-side end, on the projection 21 of the spring cage 16 and, at its bottom-side end, on the projection 22 of the triggering pin 91. Within this projection there is situated the seal 26, an O-ring, which acts against the inner wall of the spring cage 16. The triggering pin 91 acts by way of the peripheral projection 23 against the bottom seal 20 which for its part is supported on an inwardly projecting part of the bottom plate 6. The bottom-side end 14 of the triggering pin 91 projects through the central opening of the bottom plate 6 out of the pressurized can and can be correspondingly actuated from outside, for example by the triggering member 93.

(21) FIG. 4 shows the lower part of the pressurized can according to the invention from FIG. 2 after the closure element 8 has been ejected. The plunger 9 and cover 8 have been omitted in the illustration, the arrows designating the outlet direction of the second component contained in the lower chamber 11. The lower chamber 11 is expediently filled pressurelessly with the second component to an extent of approximately 60 to 100%. This results in the fact that, after the cover has been ejected, on the one hand, gas—as a rule, air—contained in the lower chamber 11 rises into the upper chamber 12 and, on the other hand, liquid flows out of the upper chamber 12 into the lower chamber 11, also driven by the higher pressure prevailing there. This promotes the mixing of the two components. In addition, mixing-promoting elements can be present, for example balls or rods made of metal. The cover 8 released from its anchoring and also the plunger 9, neither being illustrated here, can move freely in the can space and contribute to the mixing of the two components upon shaking of the can.

(22) FIG. 4 shows the triggering pin 91 in its triggering position (plunger 9 not shown), that is to say it has been pressed out of the spring cage 16, by contrast with the illustration in FIG. 2. The triggering knob 93 has been is correspondingly pushed into the can bottom and impinges against the bottom plate 6 by the upper edge of its receptacle 94. The bottom plate 6 limits the insertion of the triggering member 93 into the bottom region of the pressurized can.

(23) FIG. 5 shows a second variant of an opening device according to the invention in the region of the separating disk 4. In this case, the opening device has a threaded rod 9 which is guided through the bottom into the lower chamber 11 and is screwed completely by its threaded part 95 into the receptacle 82 of the cover 8. The receptacle 82 is correspondingly provided with an internal thread.

(24) The threaded rod 9 is rotatably mounted within a receptacle which corresponds to the spring cage 16 of FIG. 2, but is fixed in its position. Sealing elements are provided in order to secure the sealing tightness to the outside.

(25) Rotating the threaded rod 9 by means of a handle or a transverse rod outside the can causes it to be rotated out of the receptacle 82 of the cover 8. Since the threaded rod 9 cannot change in its position itself, this leads to the cover 8 being detached from the separating disk 4.

(26) To ensure that the cover 8 cannot corotate with the threaded rod, the separating disk 4 has, in the region of the edge 43, a nose 44 which interacts with a corresponding notch of the cover 8 in the edge region. This prevents the cover 8 from corotating upon rotation of the threaded rod 9, with the result that the rotational movement of the threaded rod 9 is converted into an upward movement of the cover 8, which is released from its anchoring in the separating disk 4 and frees the opening into the upper chamber 12.

(27) It goes without saying that, apart from the forms of the cover that are illustrated here, numerous further variants are possible for the closure element, for example in the form of a membrane which is stretched over the opening of the separating disk 4 and which is secured in its position by a securing ring, in the form of a separating disk which is clamped into the opening and which is pressed out of its anchoring by the pressure of the plunger, or in the form of a thin plastic plate which is integrally formed with the separating disk 4 in the region of the opening and which is ejected by the plunger or is torn open along an annular weakening zone.

(28) Equally, the spring cage 16 can be replaced by a rubber plug, as described for example in WO 85/00157 A mentioned above.

(29) FIG. 6 shows a variant of the separating disk 4 according to the invention with the collar 43 for securing the plug (not shown). The edge region of the separating disk 4 is of asymmetrical design with a smaller upper branch 41 and a larger, reinforced lower branch 45 which improves the load transfer. The two branches 41 and 45 flank the peripheral groove 42 in which the necking 15 of the can body 2 engages.

(30) The necking 15 is step-shaped in form such that it forms a bearing surface pointing in the direction of the upper chamber. In this region, the necking extends substantially perpendicularly to the can axis. The underside of the upper branch 41 of the edge region of the separating disk 4 is adapted to the step-shaped profile of the necking 15, as is the lower branch 45 with its contact side to the necking 15. This improves the seating of the separating disk, which can be beneficial particularly in the case of relatively large pressure differences between the chambers.

(31) In principle, it may be expedient to stabilize the necking, irrespective of what shape it has, by a ring applied on the outside in order to counteract the internal pressure of the pressurized can. Such a ring inserted into the necking can consist of rubber, plastic or metal.

(32) It goes without saying that the embodiments shown in the drawings can be combined in any desired manner where this is technically expedient.