Abstract:
The cartridge dispenser comprises a double cartridge having two cylindrical containers of different cross-sections, a drive for a dynamic mixer, and a housing base in which the drive shaft of the dynamic mixer is arranged in a longitudinally displaceable manner. The mixer drive shaft is guided in a laterally displaceable manner such that the driver of the mixer drive shaft is situated on the center axis of the mixer rotor independently of the cross-sectional ratio of the containers of the double cartridge. The mixer is located on the center axis which extends between the outlets of the containers. The mixer drive shaft is automatically forced to the correct position when a double cartridge is inserted. Consequently, the driver is always correctly aligned to the mixer rotor. Suitable means in the housing base always provide a correct location of the cartridges, and in a preferred embodiment, the mixer can be attached to the cartridge without the need of being previously oriented.

Description:
FIELD OF THE INVENTION 
     The present invention refers to a cartridge dispenser comprising a double cartridge with two containers of equal or different cross-sectional areas, a drive for a dynamic mixer, and a housing base in which the drive shaft of the mixer is arranged in a longitudinally displaceable manner. 
     It refers also to a cartridge dispenser comprising a double cartridge with two containers of equal or different cross-sectional areas, a drive for a dynamic mixer, and a housing base in which the double cartridge is arranged, and further to a dispensing or metering appliance comprising two containers of equal or different cross-sectional areas and a mixer, more particularly a dynamic mixer. 
     BACKGROUND OF THE INVENTION 
     A dispenser for a predetermined dispensing ratio is disclosed in European Patent No. 492,413, according to which the drive shaft of the mixer is manually displaceable in the axial direction in order to couple or uncouple the mixer. U.S. Pat. No. 4,981,241 discloses an appliance allowing to dispense cartridges of different dispensing ratios and accordingly of variable cartridge diameters in one and the same dispenser, which~is only designed for static mixers, however. 
     SUMMARY OF THE INVENTION 
     On the background of this prior art, it is a first object of the present invention to provide a double cartridge dispenser for dynamic mixers where the drive of the dynamic mixer operates with any combination of double cartridges of different dispensing ratios resp. container cross-sections. This object is attained by a dispenser wherein the mixer drive shaft is displaceably guided in such a manner that the tongue end of the mixer drive shaft is situated on the center axis of the mixer rotor independently of the cross-sectional ratio of the containers of the double cartridge. 
     A further object of the invention is to allow double cartridges having equal or different container cross-sections in a large range of e.g. 1:1 to 10:1 to be used in one and the same dispenser. This object is attained by a dispenser wherein locating means in the housing base and/or locating means on the double cartridges allow correct retaining positions of double cartridges having containers of different cross-sectional ratios of preferably 1:1 to 10:1. 
     A further object of the invention is to allow a mixer to be connected to one and the same dispensing or metering appliance comprising containers of equal or different cross-sections independently of its orientation with respect to the containers. 
     Further characteristic features and advantages are defined in the dependent claims. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention will be explained in more detail hereinafter-with reference to drawings of exemplary embodiments. 
     FIG. 1 shows a longitudinal section of an embodiment of the invention; 
     FIG. 2 shows the embodiment of FIG. 1 in a top view; 
     FIG. 3 shows an embodiment similar to FIG. 2, however with a double cartridge having equal cross-sections; 
     FIG. 4 shows a cross-section according to line IV—IV in FIG. 2; 
     FIG. 5 shows a cross-section according to line V—V in FIG. 3; 
     FIG. 6 shows a top view of an alternative embodiment of the cartridge of FIG. 4; 
     FIG. 7 shows a top view of an alternative embodiment of the cartridge of FIG. 5; 
     FIG. 8 shows a top view of another alternative embodiment of the cartridge of FIG. 4; 
     FIG. 9 shows a cross-section according to line IX—IX in FIG. 8; 
     FIG. 10 shows a top view of another alternative embodiment of the cartridge of FIG. 4; 
     FIG. 11 shows a cross-section according to line XI—XI in FIG.  10 ;, 
     FIG. 12 shows a cross-sectional view of the connection of a mixer to a 5:1 cartridge; and 
     FIG. 13 shows a cross-sectional view of the connection of a mixer to a 1:1 cartridge. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     FIG. 1 shows those elements which are important for the actuation of the mixer while the remaining parts, more particularly the drive of the dispensing plungers and their disposition in the housing, may be realized e.g. according to European Patent Publication No. 956,908. 
     FIG. 1 shows dispenser  1  with housing base  2 , double cartridge  3 , dynamic mixer  4 , and drive shaft  5  with tongue end  6  for the dynamic mixer. In order to ensure a minimum flow distance of the components, the mixer is located on the connecting line between the outlets of the cartridge containers and between the prolongation of the outlets respectively between the imaginary prolongation of the cartridge containers. Although this is the most advantageous position of the mixer, small deviations therefrom are also possible. It follows that the position of the mixer with respect to the housing base and to the axes of the dispensing plungers varies according to the cross-sectional ratio of the cartridge containers. 
     The rotor of dynamic mixer  4  is driven by a non-represented electric drive which actuates mixer drive shaft  5  via drive shaft  7 , gear wheels B, and a toothed belt  9 . The mixer drive shaft is pivotable on a yoke  10  having multiple bearings and on a pivoting lever  12  turning on the same axle  11 . Furthermore, the mixer is fastened to the cartridge outlet by a bayonet ring  75  which may also be a screw ring. 
     On the drive side, the mixer drive shaft is supported on a compression spring  13  and thereby kept in engagement with the rotor of the dynamic mixer. At the end of the return stroke, the mixer shaft may e.g. be manually retracted from the mixer according to European Patent No. 492,413, or automatically, as in the present example, by a connection  14  moving with the slide. 
     As will be described in more detail below, when double cartridges of different cross-sectional ratios are inserted after having exchanged the cartridge positioning guide strips, the mixer drive shaft is automatically pivoted to the correct position due to the curvature of the cartridge cylinders and fixed in detents  15 , and the dispenser is ready for use as the dynamic mixer is attached. 
     FIGS. 2 and 3 show the dispenser of FIG. 1 in a top view, and according to FIG. 2, a double cartridge  16  having two cylindrical containers  17  and  18  is inserted whose cross-sectional areas correspond to a ratio of 5:1. In FIG. 3, the same housing base  2  holds the double cartridge  3  of FIG. 1 which comprises equal containers  19  and  20  having a cross-sectional ratio of 1:1. The comparison of FIGS. 2 and 3 shows that on one hand, the distance A between the axes of the two dispensing plungers  21  and  22  is the same for all double cartridges in spite of different cross-sectional ratios while the end position of drive shaft  5  of the tongue end thereof varies according to the actual cross-sectional ratio. In the present embodiment, the displacement is provided by a pivoting movement in parallel to the longitudinal axes of the containers while the two end positions of the tongue end are located, in accordance with the center axis Z of the mixer or of the rotor, on the connecting line between the container outlets, as appears especially in FIGS. 4 and 5. 
     However, it is also possible instead of a pivoting movement to displace the mixer shaft by means of a parallel guidance, especially if more than two different double cartridges are used, or to provide a flexible mixer drive shaft, which also allows a displacement of the tongue end. However, the displacement of the drive shaft is always effected such that in its end position, the tongue end is located on the center axis Z of the mixer rotor in order to ensure a correct driving action. 
     If the same dispenser  1  is to be used for double cartridges having different cross-sections, i.e. different geometrical dimensions, it follows that the double cartridge and the dynamic mixer must be aligned to the plungers and to the mixer drive shaft. According to the invention,-the exact guidance and positioning of the cartridges and thus also of the dynamic mixer in one and the same dispenser and housing base is obtained by the application of a cartridge tray having exchangeable guide strips which are adapted to the different diameters of the cartridge containers and are inserted in the cartridge tray, or by locating means which are provided-on the cartridges. 
     In the present examples according to FIGS. 4 and 5, two double cartridges having cross-sectional ratios of 5:1 and 1:1 are described, but it is understood that the same applies to other cross-sectional ratios e.g. from 1:1 to 10:1. When comparing FIGS. 4 and 5, it appears that cartridge tray  23  on one of the sides, i.e. in this case on the right side,.has a curvature radius R24 which corresponds to the curvature of container  19 , i.e. of 1:1 cartridge  3 , and that curvature radius R25 on the left side of the cartridge tray corresponds to the larger container  18  of double cartridge  16 . 
     It follows that in all of the above-mentioned cross-sectional ratios, one container of the double cartridge is directly supported on the cartridge tray. The respective other container, in this case  17  or  20 , rests on a guide strip  26  or  27  respectively which is supported on the cartridge tray. 
     The cartridge tray is supported on the walls  30  and  31  of housing base  2  by two arms  28  and  29 , the cartridge tray comprising two longitudinal grooves  32 ,  33  in which corresponding shanks  34  and  35  of the guide strip engage. These shanks are so designed or coded that the guide strips cannot be inserted in the wrong position. The second shank  36  and  37  of guide strip  26  and  27  respectively rests on the curved portion of the cartridge tray. It is understood that the curvature radii R38 and R39 of the guide strips are the same as those of the containers they are intended to receive, i.e. in this case  17  and  20 . 
     Dispenser  1  further comprises a housing cover  52  whose upper wall  53  is internally provided with an aligning rib  54  which is disposed in the center area and comprises a sloped portion  55  and a horizontal portion  56 . These two portions serve the purpose of holding down and aligning either the connecting flange  49  of 5:1 cartridge  16 ,  116 , or  216 , see FIG. 4 or  9 , or connecting flange  51  of the 1:1 cartridge, see, FIG. 5 or  11 . 
     Instead of using guide strips, it is also possible to provide corresponding spacers on the cartridges. Such alternatives are illustrated in FIGS. 6 to  11 ,. the spacers being arranged on the container walls and/or on the outlets or on the flanges. 
     In FIG. 6, double cartridge  116  corresponds to double cartridge  16  of FIG.  4  and comprises the two containers  117  and  18 . Larger container  18  is the same as in FIG. 4, while the wall of container  117  of smaller diameter comprises two spacers  44  and  45  which are intended to rest on cartridge tray  23  and correspond to guide strip  26 . It is also possible to provide spacers on the container having the larger diameter. 
     In FIG. 7, double cartridge  103 , which corresponds to double cartridge  3  of FIG. 5, includes two identical containers  19  and  120 , the wall of container  120  comprising two spacers  46  and  47  which correspond to guide strip  27  and are intended to rest on cartridge tray  23 . If the cartridge tray is differently designed,.e.g. for more than two different cartridges, it is also possible to provide spacers on both containers. 
     FIGS. 4-7 further show and double cartridge  16 ,  116  with outlets  40  and  41 , e.g. of different outlet diameters, as well as double cartridge  3 ,  103  with the two outlets  42  and  43  of the same diameter, and mixer drive shaft  5 . When comparing FIGS. 4 and 5, it appears that the axis of drive shaft  5  is displaced as it is always located between the two cartridge containers, i.e. between the two outlets. The mixer and therefore also the tongue end lie on an axis Z which is situated on the connecting line of the two outlets and between the imaginary prolongation of the two containers. In the present example, the outlets lie on the connecting line between the two container center axis. 
     In FIGS. 8,  9  and  10 ,  11 , it shown that the cartridge may also be held in the dispenser by supporting it on the housing base in such a manner that the cartridge containers are always inseted and maintained in the correct position independently of the ratio of thair sizes. 
     In FIGS. 8 and 9, a 5:1 cartridge inserted in the dispenser is illustrated similarly to FIGS. 2 and 4. The cartridge includes two containers  17  and  18 . Container  17  comprises an outlet  57  and container  18  an outlet  58 , outlet  57  being provided with spacers  59 ,  60  and outlet  58  with spacers  61 ,  62  whose function is similar to that of spacers  44 - 47 . Spacers  59 - 62  rest on a recess  63  in wall  64  of housing base  2  facing the mixer, and their dimensions are adapted to the recess. A crosspiece  71  is arranged in the area on the plunger side of the cartridge, which is so designed that the cartridge is supported on mixer drive shaft  5 . 
     In analogy to FIGS. 8 and 9, an inserted 1:1 cartridge is illustrated in FIGS. 10 and 11. Cartridge  203  includes the two containers  19  and  20  with outlets  65  and  66 . The outlets are provided with spacers  67 ,  68  resp.  69 ,  70  which rest on recess  63 . The cartridge further comprises crosspiece  72 . 
     In the embodiments according to FIGS. 6-11, the cartridge tray is not necessary for supporting the cartridges and in this case only serves as a collecting basin. 
     In the cross-sections of FIGS. 12 and 13, it appears that the inlets  73  and  74  of mixer  4  have equal dimensions while in the case of cartridges having a ratio other than 1:1, outlets  40 ,  57  of containers  17 ,  117  of smaller cross-section have a smaller diameter than outlets  41 ,  58  of containers  18  of larger cross-section. The different dimensioning of the outlets serves as an adaptation to the different mixing ratios. 
     The diameters of the cartridge outlets are so dimensioned that the inlets of the mixer are either always insertable into the outlets of the containers of 1:1 cartridges, or that one of the inlets is insertable into the outlet of the container of larger cross-section and the other inlet is capable of being slid on the outlet of the container of smaller cross-section. In this manner, the mixer can be attached to any suitable cartridge or to any suitable metering or dispensing appliance in one position or another rotated by 180°, i.e. without the need of previously orienting it. Moreover, this combination of mixer inlets and dispenser outlets is not limited to dynamic mixers. 
     If a change of the dispensing ratio requires a lateral displacement of the mixer shaft, this is automatically effected due to the shape of the containers of the newly inserted cartridge, the mixer shaft being simultaneously fixed in one of detents  15 . The displacement is ensured by the wedge action of one of the walls of each container. A recess  48 ,  50  in the connecting flange  49 ,  51  on the outlet side of the cartridge serves as a passage and possibly for a fine adjustment of the mixer drive shaft. Also, toothed belt drive  9  of mixer drive shaft  5  is forcibly pivoted at the same time. 
     Although in the present example, the small distance between the cartridge containers allows the passage of the mixer drive shaft, there is no space for its drive. Therefore, the drive is located in the rear of the dispenser outside the cartridge and slide area. 
     It is understood that in the same manner as described here for cross-sectional ratios of 1:1 and 5: 1, the dispensers can be dimensioned for any other ratios as well. For example, if a ratio of 2:1 were required, a different cartridge tray or two guide strips, and corresponding spacers would be necessary while the remaining parts of the dispenser would be identical to the represented 1:1/5:1 dispenser. 
     In the present examples, double cartridges have been described which must be discarded after use. The same dispenser with the same parts can alternatively be used for supporting cartridges containing tubular bags, the supporting cartridges comprising the same spacers as the double cartridges.