EP0791404B1 - Manual discharge device for a double cartridge - Google Patents

Description

The present invention relates to a hand-operated Dispenser for a double discharge cartridge according to the preamble of claim 1.

Such a device is from EP-A-615 787 of the same Known to the applicant. This previously known device is facing certain advantages of the prior art known at the time, by the simultaneous intervention of several Teeth made from inexpensive plastic parts is. However, it has been found that this device that in particular can still be significantly improved by a linear latching movement of the driver in the Guides caused jamming problems with large ones Discharge forces adversely affect the operation and high Additional moments arise from the driver via an additional slider opposite the housing must be carried out that its pull tab on cartridges with storage cylinder with the same or not strong diameters deviating from one another unfavorably below the force application center line is arranged and that the lateral force application point with cartridges different, in particular very different Cylinder diameter in an unfavorable place. from that in all cases there is a considerable loss of efficiency.

A discharge device is known from US-A-5 314 092, in which the push rods acting on the pistons Storage cylinders with different diameters are not are arranged symmetrically, but to the side with the larger reaction forces are offset, but the Drive completely different from that according to the present invention is formed and none Has compensation tab.

It is a task based on this prior art the present invention to provide a discharge device that both for cartridges with storage cylinders with the same as even with widely differing diameters has higher mechanical efficiency and its Feed elements are less susceptible to contamination. In addition, an even more cost-effective production of this Handheld device can be guaranteed.

This task is done with a hand-operated discharge device solved according to independent claim 1. More and preferred designs, especially for cartridges with storage cylinders with a diameter ratio of 4: 1 to 10: 1 are defined in the dependent claims.

Figur 1

zeigt ein erfindungsgemässes Austraggerät im Längsschnitt,

Figur 2

zeigt das Austraggerät von Figur 1 in einem Schnitt gemass der Linie II-II,

Figur 3

zeigt ein Detail des Vorschuborgans,

Figur 4

zeigt eine Ausschnittvergrösserung von Fig. 2,

Figur 5A

zeigt das Austraggerät von Fig. 1 von vorne,

Figur 5B

zeigt eine Variante zur Figur 5A,

die Figuren 6A und 6B

zeigen eine Ausführungsvariante zum Austraggerät gemäss Figur 1 in zwei Stellungen,

Figur 7

zeigt ein zweites Ausführungsbeispiel eines erfindungsgemässen Austraggerätes im Längsschnitt,

Figur 8

zeigt das Austraggerät von Figur 7 in einem Schnitt gemäss der Linie VIII-VIII,

Figur 9

zeigt ein Detail des Vorschuborgans in Fig. 7,

Figur 10

zeigt eine Variante zum Austraggerät gemäss Fig. 7 im Längsschnitt, und

Figur 11

zeigt das Austraggerät von Figur 10 in einem Schnitt gemäss der Linie XI-XI.

The invention is explained in more detail below with reference to drawings of exemplary embodiments.

Figure 1

shows a discharge device according to the invention in longitudinal section,

Figure 2

shows the discharge device of Figure 1 in a section along the line II-II,

Figure 3

shows a detail of the feed element,

Figure 4

shows an enlarged detail of Fig. 2,

Figure 5A

shows the discharge device of Fig. 1 from the front,

Figure 5B

shows a variant of Figure 5A,

Figures 6A and 6B

1 show an embodiment variant of the discharge device according to FIG. 1 in two positions,

Figure 7

shows a second embodiment of a discharge device according to the invention in longitudinal section,

Figure 8

shows the discharge device of Figure 7 in a section along the line VIII-VIII,

Figure 9

shows a detail of the feed member in Fig. 7,

Figure 10

shows a variant of the discharge device according to FIG. 7 in longitudinal section, and

Figure 11

shows the discharge device of Figure 10 in a section along the line XI-XI.

By definition is in this description and in the Drawing the side with the handle 2 with the bottom and the opposite side, with the securing flap 27, with Denoted above, see Figure 1.

The device 1 has a handle 2 with trigger 3, the acts on a drive on a double push rod 4 that in turn on the squeeze-out piston 32 of a double cartridge 25 acts to discharge the two components. The handle 2 is made in one piece with the housing 5, the Housing 5 different guides, ribs and a cover 33, as from the following description will emerge better.

The trigger 3 is an upper pin 6, which is the lever's point of force application, with one end a compensation tab 13 connected to her other End connected via a bolt 8 to a feed member 7 is, pin 8 is the pivot point of the feed member 7th forms. The trigger 3 rotates around one in the housing 5 stored bolt 14, which is slightly below the upper Bolt 6 is arranged. The feed member 7 is with a Pressurized spring applied to a nose 16 of the Compensating bracket 13 supports.

It can be seen from FIG. 1 that the force application point 6 the trigger and the fulcrum 8 of the feed element 7 between the two parts of the toothed double push rod and at the level of the teeth 18 of the double push rod 4 are arranged, whereby tilting, or Tipping moments in the vertical direction or plane avoided become. Ideally, the teeth should be on the level the cartridge longitudinal axis or as close as possible to it lie.

The trigger 3 is also acted upon by a spring 9, which is guided on an axis 10, and on a rib 11 on Trigger lever and a rib 12 on the handle. The Feed member 7 has an overhead in the discharge direction Tooth 17 on the toothing 18 of the double push rod combs. As indicated in Figure 2, the Compensation tab 13 laterally in a slot 34 in trigger 3 and on the other hand, as dashed lines in figure 1 indicated, guided in a slot in the feed member 7, thereby preventing the compensation tab from tilting.

The feed member 7, the slide and pawl-shaped is executed and has two arms 19, the top with Teeth 17 are provided, is on side guides 35 in Housing guided, see Fig. 4, which is tilting or Prevent canting. As can be seen from Figure 1, this is Feed member 7 also in grooves 22 and 23 in Housing guided, the top 20 and the bottom 21 of the feed member are formed in a circular arc, so that it does perform a slight swivel motion, however cannot move up or down and sideways. As a result, the feed element performs a linear feed and Withdrawal movement. The feed member 7 also has one integrally formed lever 24 to the teeth 17 of the Feed member from teeth 18 on the double push rod uncoupling, and thus retracting the double push rod to enable.

From the description and the figures it appears that the Actuate the trigger 3 this around the in the housing stored bolt 14 rotates and the compensation tab 13 over the upper bolt 6 to the front, in the discharge direction, entraining. The compensation tab 13 pulls over the bolt 8 the feed member 7, the teeth 17 in the teeth 18 of the Intervene double push rod, to the left in Figure 1, and takes the double push rod in the discharge direction. The Teeth of the feed element are without during the feed Relative movement with the teeth of the double push rod in the Engagement, which is arranged over the bolt 8 Compression spring 15 on the nose 16 of the compensation tab supports and causes the meshing between Feed element 7 and double push rod 4 after Follow-up of the feed element is guaranteed. Furthermore limits a stop 36 on the feed member 7 den Swivel angle of the feed element. The lever 24 enables a pivoting of the feed element and thus the withdrawal the double push rod 4.

By using a compensation bracket attached to the two bolts 6 and 8, in the plane of the teeth 17 and 18, is rotatably attached and a linearly guided Feeding element, which, however, when following up or for the Ram retraction can perform small swiveling movements, is achieved that during the power transmission by the Trigger lever 3 no relative movement between the teeth of the Feed element and the teeth of the ram are formed, which gives the possibility of several at the same time Meshing teeth.

This is for an exact tooth mesh and a low one specific surface pressure during the entire discharge stroke crucial, and since several teeth are engaged at the same time the shear forces per tooth are lower. For a differentiated follow-up, it may be advantageous to small Teeth to use. On the other hand, the term "Tooth" also include a single tooth.

Since the driving pins 6 and 8 and the teeth 17 and 18 all lie approximately in the same plane, it follows that the total frictional forces of the device compared to prior art are much lower. The hereby improved efficiency has the consequence that the Load on the individual parts is lower and that on Trigger lever much smaller hand forces are required.

In the first exemplary embodiment according to FIGS. 1-5 this device has a tappet reverse brake in the form of a Have friction brake, such as the initially mentioned device according to EP-A-615 787 is disclosed. This friction brake can also be used as an omega-shaped spring 37 be formed, as shown in Fig. 2.

To positively secure the double push rod against reverse or to allow only a limited return, it can instead of the aforementioned friction brake by a Reverse brake can be locked with a locking slide, as can be seen from FIGS. 6A, 6B, in FIG. 6A the locked and shown in Figure 6B the unlocked position becomes.

The automatic return brake 70 from the discharge device 82 includes a gate valve 71 and one thereon acting unlocking lever 72. The unlocking lever 72 consists of an operating lever 73 and a nose 74 and a stop 75 and pivots about axis 76. The nose 74 is acted upon by a leg spring 77, which the Release lever 70 via stop 75 on cover 33 strikes. A compression spring 79 presses the locking slide 71 in a free tooth space of the teeth 18 of the double push rod 4, whereby this is not or only limited can recede.

To retract the double push rod both Feed element 78 decoupled as well as the locking slide 71st be unlocked, i.e. from the area of engagement of the Tooth 18 are pulled. This is done by the fact that the unlocking lever 72 on its operating lever 73 is pivoted manually about axis 76. The presses Leg 73 of the unlocking lever 72 on the projection 80 of the feed element 78 and thereby decouples its teeth 17 from the teeth 18 of the double push rod 4. Das Feed element 78 is identical to feed element 7, with Except for the molded lever 24, which is by the projection 80 is replaced.

Furthermore, the locking slide 71 by the on it attacking nose 74 of the release lever 73 down pushed. One connected to the release lever and cooperating with the projection 80 of the control member 78 Control curve 81 causes feed element 78 first and only then can the locking slide 71 be released. This ensures that restoring forces which are caused by the pressurized cartridge over the push rod 4 are never transmitted from the feed element 78 but only from the Locking slide 79 are added. This will Prevents jamming, and the release of the Release lever 70 is facilitated.

Whether a friction brake or a gate valve is used depends on the intended use. With the friction brake the double push rod can be relieved by one recede larger amount, which the reflow of the medium to be discharged largely prevented. at The double push rod is used using a locking slide blocked by means of the toothing, whereby the pressure build-up in the cartridge is largely preserved, and one Maximizing the discharge stroke, i.e. the discharge quantity per stroke.

The reflow can be done by manually operating the Unlocking lever can be prevented, causing the double push rod is released and thus the discharge of the Cartridge pressure only low friction values conflict.

When using cartridges with different Cross sections of the cartridge cylinders, for example 2: 1, different reaction forces occur, the horizontal Cause tilting or canting moments. Around You can avoid moments entirely or for the most part Point of attack for the propulsive force, i.e. the upper part 41 of the trigger, or the compensation tab 13 the reaction forces accordingly to the side with the larger ones Reaction forces, i.e. with the larger cartridge diameter, be arranged offset. It can also mean only parts of the trigger or the whole Trigger lever together with the handle can be arranged offset.

For cartridges with very different cross sections the cartridge cylinder, for example 10: 1 is in the Figures 1 and 2 arrangement not optimal, since the desired lateral displacement of the point of attack for the Propulsive force has the result that the tooth width of the Ram side of the larger cartridge cylinder too strong is reduced. The exemplary embodiments according to the figures 7-11 take this into account by the Drive elements by the smallest possible amount below the Gearing can be arranged. This means that for large Differences in the cartridge discharge ratio such as B. 10: 1 necessary lateral displacement carried out as required without reducing the width of the gearing to have to.

By lowering the feed elements arise Forces in the vertical direction on the feed elements, which cause additional friction losses this with very different cartridge discharge ratios significantly less than that avoided friction losses caused by the strong different ram reaction forces caused horizontal moments would have been generated because of the Force attack on the side as shown on the optimal Value can be offset. This results overall seen smaller canting moments and consequently lower frictional forces on all device organs, what the efficiency continues to be optimized and a lower one Parts.

In the figures of the following exemplary embodiments the unchanged parts are the same as for the referred to previous embodiments and numbered so that only the new or changed parts received new digits.

The device 45 according to FIG. 7 is similar to the device 1 according to FIG Figure 1 constructed and has the same handle 2 that with a trigger lever 47 adapted in the upper part 46 which is via a drive on the double push rod 4 acts, which in turn on the ejection piston 32 one Double cartridge 25 acts on the two components unsubscribe. This handle 2 is also in one piece with the Housing 5 made, the housing 5 different Guides, ribs and a lid 33 which can also be fastened with screws 42.

The trigger lever 47 is over the upper pin 6 with a End of the compensation tab 48 connected to her the other end via a bolt 49 with the feed member 50 connected, which is drawn in detail in FIG. The Bolt 49 forms the fulcrum of the feed element 50. The Trigger lever 47 rotates about the bolt 14 mounted in the housing, which is arranged slightly below the upper pin 6. The compensation tab 48, which is used as a sheet compensation tab serves is acted upon by a tension spring 51 which on the one hand on a nose 52 on the feed element 50 and on the other hand, on a nose 53 on the compensation tab 48 attacks. The tension spring 51 is in contrast to the embodiment shown in Figure 1 below the two Bolts 6 and 49, the function of the tension spring being the same is like the function of the compression spring 15 according to FIG. 1.

By arranging the feed member 50 below the Tooth 18 of the double push rod 4 must vertical tilting or tilting moments accepted will, however, the full lateral displacement of the force attack allows what is strong different discharge ratios to minimize the horizontal moments is a great advantage.

The trigger lever 47 is articulated immediately and with the spring 9 acts like that in Figure 1. The feed member 50th has an upper toothing 54 in the discharge direction on, which in turn with the teeth 18 of the double push rod 4 combs. The guide of the compensation tab 48 8, is the same as in FIG. 2 shown.

The slide and pawl-shaped feed member 50 has Contrary to the two arms 19 in Fig. 1 only one, but continuous boom 55, the top with the Teeth 54 is provided, and is performed in the same way as that Embodiment according to Figure 4. In deviation from Embodiment according to Figure 1 is the rest of the Feed member guided on the bolt 49, which on a corresponding guide surface 57 slides in the housing, see Figure 7. The feed member 50 also has the lever 24 to the teeth 54 of the feed member 50 against the train the spring 51 from the teeth 18 on the double push rod uncouple so that the double push rod is retracted can be.

Due to the wide support in the horizontal direction and Guide the bolt 49 or feed member 50 between the upper guide surface 58 and lower guide surface 56 becomes tilting of the feed element in vertical Avoided direction.

In the embodiment variant according to FIGS. 10 and 11 the pin is guided by two sliding blocks 59, which are placed on a bolt 60. Like from the Figures 10 and 11 shows the sliding blocks 59 above and below in guides 61 and 62 between the housing and Lid guided. The device 63 according to the variant Figures 10 and 11 are identical in the remaining parts with those of FIGS. 7 to 9.

By storing and guiding the feed element by means of the bolt or sliding blocks on the bolt can not dodge up or down. That on the bolt stored feed element is also laterally in the housing aligned with guides 65, making it a discharge performs linear feed and retract movement when Follow up and for the ram retraction, however, by bolt 49; 60 is pivoted.

The operation of the embodiments according to the Figures 7 to 11 is the same as that of the first Embodiment. The difference lies in particular in that the pin 49 or 60 of the feed member 50 is below the toothing plane of the push rod and it is thus possible, as can be seen in particular from FIGS. 7 and 10 emerges, the teeth 54 on the thrust member as desired to be arranged on the width of the double push rod and further also the lateral force application by trigger and Optimally lay tab, which ensures that a sufficient tooth width even when there is a large gap between them different discharge ratios e.g. from 10: 1 to Available and also the smallest possible horizontal Moments from different push rod reaction forces arise. As a result, maximum efficiency can also be achieved for extreme discharge conditions can, while by lowering the force application point increased vertical tilting moments in this regard have relatively little influence.

In Figure 1, a cartridge 25 is located, the Device in a holder 26 with a securing flap 27 is introduced and secured. Safety flaps are in the EP-B-543 776 by the same applicant is described in detail. In the device according to FIG. 1, the securing flap 27 is on articulated to an axis 28, as can also be seen in FIG. 2, during the transfer of the holding forces, however directly on the housing and not on the axis of rotation 28 he follows. The securing flap 27 has a cross section U-shaped part, the first leg 38 of the flange 29 engages behind the cartridge and its second leg 39 abuts a shoulder 40 on the housing. This way trained locking flap causes the flange 29th is gripped on all sides of the cartridge and therefore less sagging and further that the holding forces directly be transferred to the housing and the storage of the Flap is relieved.

With different cartridge discharge ratios or it may be necessary to connect a coded mixer the cartridges are always aligned in the device insert so that there is a coding between Cartridge and discharge device proves to be advantageous. A such coding can, for example, with a lead or cams 30 on the device and a corresponding notch 31 be achieved on the cartridge, with this Measure is achieved that a cartridge either not inserted incorrectly, or incorrectly inserted Cartridge cannot be discharged. Also leads this measure to improve the orientation of the Cartridge flange in the discharge device.

A further coding results from different ones Diameters of the cartridge cylinders, the cartridge flange similar to the cartridge 25 according to the figures 5A and 7 and the bracket on the device accordingly the is the same as the bracket 26 with the difference that due to the different cylinder diameters Cartridge can only be inserted if the match the corresponding parts.

A further coding results according to FIG. 5B, in which the cylinders 83, 84 with different diameters lead an asymmetrical cartridge flange 85, the Outline serves as coding. Accordingly, the Bracket 86 of the device shaped so that the cartridge inserted and locked in only one position can be. The remaining parts of the device and the flap are the same as in the example according to FIGS. 5A and 7, without cams and notch.

Such encodings are not just for that described Device applicable, but more generally for insertion from cartridges to discharge devices if a defined one Orientation is required.

Claims (20)

1. Manually operated dispensing appliance for a double dispensing cartridge for two-component substances, comprising a double thrust ram (4) and a drive means jointly acting on the double thrust ram and actuated by a trigger lever, the drive means including a thrust member which, by means of a toothing (17; 54) acts upon a thoothing (18) of the double thrust ram, and an arc compensating element arranged between the thrust member and the trigger lever, characterised in that the thrust member (7, 78; 50) is guided in such a manner that it is incapable of a tilting movement or any movement transversely to the advance direction during the advance stroke but capable of a pivoting motion for its disengagement from the double thrust ram during the return stroke and for unlocking the double thrust (4) ram prior to its re-engagement, the arc compensating element for the trigger lever (3, 47) being a compensating link (13, 48) one end of which is connected by a pivot (6, 49) to the trigger lever (3, 47) and the other end of which is rotationally connected by a pivot (8) to the thrust member (7, 78; 50).
2. Dispensing appliance according to claim 1, characterised in that the point of impact (6) of the force of the trigger lever (3) as well as the pivot (8) of the thrust member (7, 78) are located between the two parts of the toothed double thrust ram (4) and at the height of the toothing (18) of the double thrust ram (4).
3. Dispensing appliance according to claim 1 or 2, characterised in that in the case of different cross-sectional areas of the cylinders (25; 80, 81) of the double dispensing cartridge, the trigger lever (3, 47) or portions (41, 46) thereof and the compensating link (13, 48) are offset proportionately to the reaction forces towards the side of the greater reaction forces, resp. towards the cylinder having the larger cross-sectional area.
4. Dispensing appliance according to one of claims 1 to 3, characterised in that the rear end of the compensating link (13; 48) is under the action of a compression or tension spring (15; 51) acting upon the toothed arms (19; 55) of the thrust member (7, 78; 50) through the pivot (8; 49, 60) connected to the thrust member (7, 78; 50) in order to maintain the toothing (17; 54) of the latter in engagement with the toothing (18) of the double thrust ram (4) during the advance movement.
5. Dispensing appliance according to one of claims 1 to 4, characterised in that the rear portion of the latch and slide shaped thrust member (7) comprises upper and lower surfaces (20, 21) rounded in a circle arc shape and its end opposite the toothing (17) is provided with an integrally formed lever (24) whose actuation allows to disengage the toothing (17) of the thrust member from the toothing (18) of the double thrust ram (4).
6. Dispensing appliance according to one of claims 1 to 4, characterised in that the rear portion of the latch and slide shaped thrust member (7) comprises upper and lower surfaces (20, 21) rounded in a circle arc shape and an independent unlocking lever (72) is provided whose actuation allows to disengage the toothing (17) of the thrust member from the toothing (18) of the double thrust ram (4).
7. Dispensing appliance according to claim 1 or 3, characterised in that the force impact point (6) of the trigger lever as well as the pivot (49, 60) of the thrust member (50) are located below the toothing of the double thrust ram (4).
8. Dispensing appliance according to claim 7, characterised in that the latch and slide shaped thrust member (50) is guided within the housing by the pivot (49, 60) connecting the thrust member and the compensating link (48), and in that its end opposite the toothing (54) is provided with an integrally formed lever (24) whose actuation allows to disengage the toothing (54) of the thrust member from the toothing (18) of the double thrust ram (4).
9. Dispensing appliance according to claim 8, characterised in that sliding blocks (59) are journalled on each end of the pivot (60) and guided between upper and lower guide surfaces (61, 62) of the cover and of the housing, respectively.
10. Dispensing appliance according to one of claims 1 to 9, characterised in that it comprises a friction brake (37) acting upon the double thrust ram (4).
11. Dispensing appliance according to claim 10, characterised in that the friction brake is an omega-shaped spring (37).
12. Manually operated dispensing appliance according to one of claims 1 to 11, characterised in that the dispensing appliance (82) comprises a nonreturn brake (70) including a locking slider (71) acting upon the toothing (18) of the double thrust ram (4).
13. Dispensing appliance according to claim 12, characterised in that the nonreturn brake (70) comprises an unlocking lever (72) acting on the locking slider and designed in such a manner that the thrust member (78) is disengaged from the toothing (18) of the double thrust ram (4) first and then the locking slider (71).
14. Dispensing appliance according to one of claims 1 to 13, characterised in that the toothing (54) of the thrust member (50) is freely positioned with respect to the width of the double thrust ram (4).
15. Dispensing appliance according to one of claims 1 to 14, characterised in that the double dispensing cartridge (25; 83, 84) is held in a holder (26; 86) and secured by a retaining flap (27), the retaining flap being hinged to the housing and designed to positively retain the flange (29; 85) of the cartridge.
16. Dispensing appliance according to claim 15, characterised in that the retaining flap (27), seen in cross-section, comprises a U-shaped portion whose first leg (38) engages behind the cartridge flange (29, 82) and whose second leg (39) rests on a stepped portion (40) of the housing (5) such that the retaining forces are directly transmitted to the housing.
17. Dispensing appliance according to one of claims 1 to 16, characterised in that the dispensing appliance and the cartridge are coded such that the cartridge can be inserted in the holder in a particular orientation only.
18. Dispensing appliance according to claim 17, characterised in that the coding means consist of a projection (30) on the dispensing appliance and of a notch (31) in the cartridge, or vice versa.
19. Dispensing appliance according to claim 18, wherein the coding means consist of the different diameters of the cartridge cylinders (83, 84).
20. Dispensing appliance according to claim 18, characterised in that the coding means consist of a holder (86) and of an asymmetric cartridge flange (85) whose shape essentially follows the outline of the different diameters.

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