EP1955779B1 - Double chamber cartridge - Google Patents

Abstract

The two chamber cartridge (1) has a cartridge pipe (2), which contains a forward front wall (3) on one end and a mouth piece molded on it forming an outlet channel. An axially sliding piston is arranged in the inner space of the cartridge and seals the inner space of the cartridge from outside. A ring piston (10) is floatingly arranged in the inner space of the cartridge by which a body located between the ring piston and the piston is subjected to pressure and moves in the direction of the mouth piece.

Description

The invention relates to a two-chamber cartridge for two separate plastic masses a and b with a cartridge tube having at one end a front end wall and a molded thereon, an outlet channel forming mouthpiece, arranged in the cartridge interior, axially displaceable, the cartridge interior after Outside sealing piston, with an inner tube located in the outlet, which extends axially inwardly beyond the end wall in the cartridge interior, with an annular piston which is arranged in the cartridge interior between the piston and the end wall and provided with a bore, in which the Inner tube protrudes, and divides the cartridge interior in a front, in communication with the outlet passage for the interior of the mass b and a rear, in communication with the inner tube associated rear interior for the mass a in a sealing manner.

In the construction trade, it is common today to offer various building materials and plastic materials, such as silicones, adhesives and the like packed in a cartridge on the market. These building materials are then expressed on site using a pistol standard pistol from the cartridge and processed. As a classic case for that one can call the filled with silicone cartridges.

For many applications, it is now necessary to use two components, which should only react with each other on site. This applies, for example, to 2-component injection mortars. For example, one of these components is a reaction resin type, while the other component is the required hardener.

These components must be stored separately from each other in the cartridge before processing. This is served by the two-chamber cartridge in question here.

Various types of such two-chamber cartridges are already known. This includes, for example, the so-called tubular film cartridge. The 2-component tubular film cartridge can be processed like a silicone cartridge in a standard 1-component pistol (hereafter referred to as a standard pistol). The tubular film used in this case has two separate chambers, which are each filled with only one component. This tubular film is compressed when the standard gun is actuated. The two components are pressed out of the cartridge.

A disadvantage of this system is the effort that must be operated to fill the 2-chamber tubular film with the two components and thus produce.

Furthermore, so-called side-by-side cartridges are known, which are constructed from two cylindrical tubes, which are arranged next to one another and connected to one another and open into a coaxially formed head piece. One component is located in a tube, while the other component is in the other tube.

A disadvantage of this system is that special extrusion guns are required whose dimensions must be matched to the diameter and the volume of the 2-component cartridge.

Further, so-called. Coaxial cartridges are known, which are constructed of a cylindrical outer tube and a cylindrical inner tube located therein, so that two separate chambers in a "tube-in-tube" arrangement are present. In this case, the outer tube is filled with a component and the inner tube with the other component.

Also for this type of cartridge, a special Auspresspistole is required, the dimensions of which must be matched to the diameter and the volume of the cartridge.

There are already known two-chamber cartridges with axially one behind the other chambers. A typical representative is in the EP-0 624 403 A1 described.

Other two-chamber cartridges for two-component plastic masses with chambers arranged axially one behind the other are in the DE 10 2005 000 757 A1 and DE10 2004 042 665 A1 explained.

The object of the present invention is to provide a two-chamber cartridge which can be pressed out with a standard gun and which has a simple structure and can therefore be produced cost-effectively.

This object is achieved by a two-chamber cartridge according to the teaching of the claims.

The cartridge according to the invention has a cartridge interior, which is divided into two axially one behind the other lying interior spaces, wherein an interior serves to receive the mass a or is filled with the mass a, while the other interior serves to accommodate the mass b or with this Mass b is filled.

Between these two masses or between the two inner chambers, an annular piston is arranged floating in the interior of the cartridge, which subdivides the cartridge interior into the two said internal spaces. This annular piston has a bore into which an inner tube protrudes, which extends from the mouthpiece of the cartridge into the cartridge interior. This inner tube serves to guide the annular piston. In addition, of course, the bore in the annular piston should be matched in shape and dimensions to the shape and dimensions of the inner tube, so that the annular piston seals the front interior of the rear interior. Of course, the annular piston must also perform its sealing function on its periphery relative to the inner circumferential surface of the cartridge tube. Otherwise, however, the ring piston is mechanically connected to the office in no other way. This situation is referred to in the context of the present application as "pending".

The latter of course also applies to the piston which seals the cartridge interior to the outside and against which the punch of the standard gun comes into abutment.

If the cartridge according to the invention is inserted into a standard pistol and the latter is actuated, then the piston presses the mass a in the rear interior in the axial direction in the direction of the mouthpiece and thus also in the direction of the ring piston, which in turn moves the mass b located in the front interior in the axial direction and squeezed out of the mouthpiece.

The annular piston is thus acted upon only by the mass a and therefore indirectly with pressure. The acted upon by the standard pistol with pressure piston thus acts not directly, but only indirectly via the mass b on the annular piston.

In the case of the two-chamber cartridges in question, it is often necessary for the two masses stored therein to be released in different amounts or in different volumes and combined with one another. Depending on the choice and configuration of the components that are to react with one another, the volumes of the front interior and the rear interior of the cartridge according to the invention must be selected.

This is possible by choosing the length of the inner tube accordingly.

If the volumes of the two delivered components should be approximately the same, then one chooses the length of the inner tube (more precisely, the length of the inner tube in the interior of the cartridge) in such a way that that the inner tube extends only over approximately half the length of the entire cartridge interior. If, on the other hand, one wishes, for example, a ratio of 10 parts by volume of mass a and 1 part by volume of mass b, then the length of the inner tube is selected to be correspondingly shorter and approximately so long that it corresponds to 1/10 of the total length of the cartridge interior.

Incidentally, the cartridge tube may have any shape and may have a quadrangular or polygonal cross-sectional shape, for example. The outlet channel can also be arranged eccentrically to the longitudinal center axis of the cartridge tube. Preferably, however, the cartridge tube is a hollow cylinder tube. Further preferably, the outlet channel is arranged centrically and coaxially with the hollow cylindrical cartridge tube. In this way, the cartridge according to the invention can be processed easily and simply with a standard gun.

The inner tube of the cartridge according to the invention can be guided at any point in the interior of the outlet channel. For example, it is possible to guide the inner tube parallel to the longitudinal central axis of the cartridge tube, but eccentrically to it. Preferably, however, the inner tube is arranged centric and coaxial with the outlet channel and thus extends centrally in this.

The inner tube opens freely in the cartridge interior (more precisely: in the rear interior) and preferably extends from the mouthpiece or the end wall maximally to the center of the cartridge interior.

Incidentally, the inner tube is fastened in the cartridge in such a way that the mass b located in the front interior can escape from the cartridge through the space between the outer lateral surface of the inner tube and the inner lateral surface of the mouthpiece. In the preferred embodiment, both the outlet channel and the inner tube are cylindrical are emerging from the inner tube, originating from the rear interior mass a quasi ring surrounded by the originating from the front interior mass b.

According to a further preferred embodiment, the ratio of the cross-sectional area of the inner tube to the cross-sectional area of the outlet channel corresponds to the quantitative ratio in which the mass a and the mass b are to be dispensed from the cartridge.

If the ratio of a: b is, for example, 10: 1, then the ratio of the cross-sectional area of the inner tube to the cross-sectional area of the outlet channel also corresponds approximately to 10: 1. In this way it is achieved that the masses a and b emerge from the mouthpiece at approximately the same speed. If, on the other hand, it is desired that the masses emerge at different speeds in the longitudinal direction or in the axial direction, then this ratio must be changed accordingly.

Incidentally, the cross-sectional area of the outlet channel is formed by the area delimited by the inner wall of the outlet channel, from which, of course, the cross-sectional area of the inner tube located in this outlet channel (relative to the outer lateral surface) is to be subtracted.

The mouthpiece is expediently provided on the outside with an external thread on which a nozzle can be screwed with an internal thread into which a conventional static spiral mixer can be used.

According to a further preferred embodiment, the piston has an open towards the inner tube blind hole into which the axially inwardly facing end of the inner tube can protrude when the cartridge is squeezed and thus the annular piston and the piston come to lie next to each other. In this way, the remaining dead volume of the cartridge according to the invention is reduced.

Fig. 1

eine Längsschnittansicht einer erfindungsgemäßen Zweikammerkartusche entlang A-A der Figur 3,

Fig. 2

eine Längsschnittansicht der in der Figur 1 gezeigten Kartusche entlang B-B der Figur 3

Fig. 3

eine Aufsicht auf die vordere Stirnseite der in den Figuren gezeigten Kartusche.

The invention is explained in more detail in the following drawings, which illustrate a preferred embodiment. Show

Fig. 1

a longitudinal sectional view of a two-chamber cartridge according to the invention along AA FIG. 3 .

Fig. 2

a longitudinal sectional view of the in FIG. 1 shown cartridge along the BB FIG. 3

Fig. 3

a plan view of the front end of the cartridge shown in the figures.

The in the FIG. 1 shown two-chamber cartridge (is often referred to in the context of the present documents only as a cartridge) has a cylindrical cartridge tube 2 with a front end wall 3 and a molded, hollow cylindrical mouthpiece 4, which has an external thread 5. At the opposite end of the mouthpiece 4, the cartridge tube 2 is open and closed by a piston 6.

The mouthpiece 4 and the outlet channel 9 located therein are arranged coaxially with the cartridge tube 2. Centered therein and thus also coaxial with the cartridge tube 2, an inner tube 7 extends into the cartridge interior 8 inside. The inner tube 7 represents a cylinder tube, which is fastened with the aid of struts 20 on the cartridge tube 2 or on the end wall 3. On the inner tube 7, an annular piston 10 is placed, which has a through hole 11 into which the inner tube 7 protrudes or protrudes.

The annular piston 10 divides the cartridge interior 8 in a front interior 12 which is filled with a mass b, and a rear interior 13 which is filled with a mass a. These masses a and b are indicated by different shading.

The bore 11 of the annular piston 10 is enclosed by a cylinder tube section 14, the inner lateral surface slides on the outer circumferential surface of the inner tube 7 during displacement of the annular piston 10, whereby on the one hand a seal and on the other hand, the annular piston 10 is guided, so that tilting of the annular piston 10 is prevented becomes. The annular piston 10 is also also formed at its peripheral edge as a cylinder tube portion 15, the outer circumferential surface bears against the inner circumferential surface of the cartridge tube 2 in a sealing manner and can slide along it. Between these sections 14 and 15 of the annular piston 10 is formed approximately in the form of an annular disc.

The piston 6 has a cylinder tube section 16 which corresponds approximately to the cylinder tube section 15 of the annular piston 10. Also, the piston 6 has a further cylinder tube portion 17, which, however, is closed axially outwardly from a bottom 18 and a blind hole 19, in which the axially inwardly directed end of the inner tube 7 can come to rest when the piston 6 almost completely in Direction of the mouthpiece 4 is pushed. Between the sections 16 and 17 of the piston 6 is formed approximately annular disk-shaped.

A cartridge 1 as shown in the figures can be readily inserted into a standard pistol. Upon actuation of this gun, the thrust plate of the gun comes against the piston 6 into abutment and pushes it in the further Auspressschüben in the direction of the mouthpiece 4. Thus, the located in the rear interior 13 mass a with pressure in the direction of the annular piston 10 is applied, which in turn, the mass b located in the front interior 12 is pressurized and can escape from the mouthpiece 4 or the outlet channel 9 together with the mass a.

The cartridge tube 2 and the end wall 3 and the mouthpiece 4 and the piston 6 and the annular piston 10 may be made be made of such materials that are commonly used for the cartridges in question here, for example plastic and / or aluminum. Conveniently, these parts are injection molded parts.

LIST OF REFERENCE NUMBERS

1

Two-chamber cartridge

2

cartridge tube

3

bulkhead

4

mouthpiece

5

external thread

6

piston

7

inner tube

8th

Cartridge interior

9

exhaust port

10

annular piston

11

drilling

12

front interior

13

rear interior

14

Cylinder pipe section

15

Cylinder pipe section

16

Cylinder pipe section

17

Cylinder pipe section

18

ground

19

blind

20

pursuit

Claims (7)

1. Dual-chamber cartridge (1) for two separated plastics masses a and b
   with one cartridge tube (2) which has at one end a front end wall (3) and a mouthpiece (4) moulded thereon forming an outlet channel (9),
   with an axially displaceable piston (6) mounted in the cartridge interior space (8) and sealing this interior space (8) from the outside,
   with an inner tube (7) which is located in the outlet channel (9) to extend axially inwards beyond the end wall (3) into the cartridge interior space (8) and which opens there,
   with a ring piston (10) which is mounted in the cartridge interior space (8) between the piston (6) and the end wall (3) and is provided with a bore (11) into which the inner tube (7) projects, and which divides in sealing manner the cartridge interior space (8) into a front interior space (12) communicating with the outlet channel for the mass b and a rear interior space (13) communicating with the inner tube (7) for the mass a
   characterised in that the ring piston (10) is mounted floating in the cartridge interior space (8) and can be impinged with pressure and moved in the direction of the mouthpiece (4) through the mass a located between the ring piston (10) and the piston (6).
2. Dual-chamber cartridge (1) according to claim 1 characterised in that the cartridge tube (2) represents a hollow cylindrical tube and the outlet channel (9) is mounted centrally and coaxially relative to the cartridge tube (2).
3. Dual-chamber cartridge (1) according to claim 1 or 2 characterised in that the inner tube (7) is mounted centrally and coaxially relative to the outlet channel (9).
4. Dual-chamber cartridge according to one of the preceding claims characterised in that the ratio of the cross-sectional area of the inner tube (7) to the cross-sectional area of the outlet channel (9) corresponds to the quantitative ratio in which the mass a and the mass b are to be dispensed from the cartridge (1).
5. Dual-chamber cartridge according to one of the preceding claims characterised in that the ratio of the length of the inner tube (7) extending inside the cartridge interior space (8) to the overall length of the cartridge interior space (8) corresponds approximately to the dispensing ratio of the mass b in the front interior space (12) to the mass a in the rear interior space (13).
6. Dual-chamber cartridge according to one of the preceding claims characterised in that the piston (6) has a blind hole (19) open towards the inner tube (7) and into which the axially inwardly pointing end of the inner tube (7) can project when in the pressed-out state.
7. Dual-chamber cartridge according to one of the preceding claims characterised in that the inner tube (7) extends from the front end wall (3) into the cartridge interior space (8) a maximum only to the centre, in relation to the length of this cartridge interior space (8).

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