Cartridge piston device for inserting into a cartridge, method for venting and closing a cartridge, and use of a cartridge piston device

Abstract

A cartridge piston device (1) for inserting into a cartridge (4) and for venting and rear-side closing of the cartridge (4) is illustrated and described, having a closure element (3) for inserting into the piston (2), and the closure element (3) or at least part of the closure element (3) inserted into the recess (11) is arranged so as to be guided adjustably in the insertion direction (18) from an open position fluidically opening up the channel structure (10) into a closed position fluidically closing the channel structure. In order to configure the cartridge piston device to be more user-friendly and to make it less prone to error and to improve the venting, it is provided that, in the open position, the closure element (3) for providing the open position: is held fixed, in particular with a force fit, in the recess (11) and / or strikes against the latter at least in the extraction direction (19).

Description

[0001] KDP12357WO September 27, 2023

[0002] Cartridge piston device for insertion into a cartridge, method for venting and closing a cartridge and use of a cartridge piston device

[0003] The present invention relates to a cartridge piston device with a piston for insertion into a cartridge and for venting and closing the back of the cartridge.

[0004] When closing a cartridge filled with a pasty product or cartridge contents - in particular an impression material for the dental sector - by inserting a cartridge piston device or a piston into the cartridge, which is open at the back, air pockets usually occur between the piston and the cartridge contents. For this purpose, it is known to provide the piston with a channel structure for venting. When the piston is inserted and further pushed into the cartridge, air can escape from the cartridge through the channel structure. To prevent the cartridge contents themselves from escaping from the cartridge through the channel structure, it is known from DE 200 10 417 U1 to generally close the channel structure and only release it, for example, when the piston is pushed in. It is also known from DE 200 10 417 U1 to dimension the channel structure sufficiently small so that the pasty cartridge contents cannot pass through the channel structure.Furthermore, the channel structure can alternatively be closed by a rotary closing movement of a separate part, such as a closure element, after the insertion of the piston in an additional working step.

[0005] A disadvantage of the conventional cartridge piston system is that venting the cartridge is not very user-friendly because additional tools are required. It can also lead to air pockets remaining in the cartridge if the channel structure is closed too early, or if venting is completely forgotten or poorly performed when the channel structure is released.

[0006] The object of the present invention is therefore to make the known cartridge piston device more user-friendly, to reduce the susceptibility to errors, and to improve venting. In particular, the process of closing the cartridge, including inserting the cartridge piston device, should be faster and more reliable.

[0007] The object is achieved by the features of claim 1, in a method with a cartridge piston device by the features of claim 12, a kit according to claim 12 and by the use according to claim 13. Preferred embodiments are each the subject matter of the subclaims and are disclosed in detail in the description.

[0008] According to the invention, a cartridge piston device is provided for insertion into a cartridge and for venting and closing the rear of the cartridge, comprising a piston, in particular an at least substantially cylindrical piston, and a closure element for insertion into the piston. The piston has: a front side, a rear side facing away from the front side, in particular opposite the front side, an outer side with a circumferential sealing groove and / or seal for circumferential sealing on an inner surface of the cartridge, a recess in the region of the front side for inserting the closure element in an insertion direction, a channel structure fluidically connecting the recess and the rear side for venting the cartridge, the insertion direction pointing at least substantially from the front side to the rear side, and an extraction direction opposite the insertion direction.The closure element inserted or insertable into the recess or at least a part of the closure element inserted into the recess is arranged or can be arranged so as to be adjustable in the insertion direction from an open position fluidically releasing the channel structure into a closed position fluidically closing the channel structure, wherein the piston has, in the direction of the front side, a support surface for the rear side of the closure element which is formed substantially perpendicular to the central axis of the piston and which lies opposite the end face of the closure element.

[0009] It is preferred if the piston has a recess on the front side with a support surface for the rear side of the closure element, said support surface being designed essentially perpendicular to the central axis of the piston. The recess is preferably cylindrical, conical, or tapered in the shape of a truncated cone. The recess preferably has a depth of 0.01 to 10 mm, in particular of 1 to 10 mm, wherein the surface of the recess is preferably essentially planar and in particular has the pre-channel structure. The rear side of the closure element is preferably designed as a positive side and the recess as a negative side with a larger circumference. Furthermore, the recess is preferably larger in circumference than the circumference of the rear side of the closure element, in particular the circumference of a cover on the rear side of the end face.According to an alternative, a circumferential groove is formed in the recess with the inserted closure element, which fluidically closes the groove in the closed position of the cartridge piston device, in particular by means of an auxiliary sealing element, in particular a protruding seal, on the head side, in particular the end face and / or rear side, of the closure element, a circumferential sealing lip on the head side of the closure element and / or a circumferential sealing lip or seal on the lid.

[0010] The head side of the closure element advantageously has a rear side which is opposite the front surface.

[0011] It is particularly advantageous that the closure element for providing the open position is held fixed in the recess, in particular in a force-locking manner, in the open position, and / or that the closure element for providing the open position abuts in the recess at least in the pull-out direction.

[0012] A support surface is considered to be substantially vertical if it is formed at an angle to the central axis of the piston of 80° to 100°, in particular of 85° to 95°, particularly preferably plus / minus 2°. Preferably, the support surface is flat or planar, and preferably the support surface has a pre-channel structure. The pre-channel structure can advantageously extend radially from the recess at least partially in the direction of the outer circumference of the piston. Optionally, the piston can have additional openings which extend from the front to the rear of the piston and can be closed by the closure element. The rear side of the closure element is preferably also flat or planar. The support surface can have a diameter of at least 11 mm, in particular of 11 to 23 mm, preferably of 17 mm, optionally + / - 2 mm, in particular + / - 1 mm.The rear side of the head side, in particular also the head side, of the closure element preferably has a diameter that is less than or equal to 2 mm, in particular less than or equal to 1 mm to 0.0001 mm, preferably less than or equal to 0.5 mm to 0 mm smaller than the bearing surface in order to enable the formation of a circumferential groove or at least one recess for fluid exchange.

[0013] According to a preferred embodiment of the piston, a pre-channel structure extends in the support surface up to the recess. Furthermore, it is preferred if alternative or additional openings are optionally provided in the support surface, which are fluidically connected to the rear side of the piston or toward the rear side of the piston.

[0014] The openings are advantageously arranged in the support surface and below the rear side which lies opposite the end face of the closure element. In particular, the support surface and the rear side are essentially planar and advantageously formed essentially perpendicular to the central axis of the closure element and / or to the central axis of the piston. The recess and the channel structure can be components of a particularly central vent bore of the piston. A pre-channel structure preferably runs radially from the recess in the direction of the outer circumference of the piston. Particularly preferably, the channel structure runs in the recess and the pre-channel structure runs radially from the recess at least partially outwards in the direction of the outer circumference of the piston, wherein the pre-channel structure is arranged in the support surface of the piston.In the closed position, the bearing surface of the piston comes into contact with the rear side of the closure element. Preferably, the rear side of the closure element rests on the bearing surface, preferably in a fluidically sealing manner. Both the bearing surface and / or the pre-channel structure are essentially planar. Furthermore, the bearing surface advantageously runs essentially perpendicular to the central axis of the piston. When the piston is inserted into the cartridge, the central axis of the piston lies essentially parallel to the central axis of the cartridge. The closure element, which is preferably designed as a plug, is essentially rotationally symmetrical and / or has a central axis, can be inserted into this venting bore. The closure element is preferably axially movable in the venting bore, or more precisely in the recess, at least by a means which does not fluidically close the channel structure oran open position which releases the channel structure, through to a closed position which closes the channel structure. In the installed state, that is to say at least when the cartridge has not yet been vented and when the closure element is in the open position, the closure element or the plug protrudes from the piston and keeps the vent hole in the piston free; this enables a fluid connection from the front to the back of the piston through the piston via the channel structure. When the piston is pushed forward or the piston is adjusted in the cartridge, the air from the cartridge can escape through the channel structure or the vent hole through the piston and out of the cartridge. As soon as the impression material filled in the cartridge comes into contact with the piston, in particular with the front and / or with the closure element, and in particular as soon as a sufficiently large axial force is exerted by the rather viscous orWhen the pasty impression material acts on the closure element, the closure element is pressed further into the piston. This closes the channel structure or the vent hole, preventing fluid passage through the piston, and only occurs once the cartridge is at least almost completely vented. This eliminates the need for a manual closing movement of the closure element on the piston.

[0015] A piston for a cartridge is typically inserted into the back of the cartridge, in particular into a piston opening, and closes it at least approximately, preferably airtight or fluid-tight. The piston usually has a front side facing the cartridge contents, in particular an approximately flat one, a rear side facing away from this, and an outer side with a circumferential sealing groove and / or seal for circumferential sealing on an inner surface of the cartridge. It is also possible for the rear side of the piston to face the cartridge contents. The cartridge piston device preferably has a planar surface at least in the region of the end face of the head side of the closure element in order to enable automatic closing by the application of force from the media. The front side is oriented towards the media side, i.e. towards the cartridge contents. The rear side is arranged on the apparatus side or conveyor side.

[0016] The sealing groove and / or seal is designed such that the piston is axially displaceable within the cartridge while still providing a fluidic seal in the area of ​​contact with the inner surface. Particularly when the cartridge is full or has no other (open) opening apart from the piston opening, the remaining volume between the piston and the space within the cartridge is reduced upon insertion of the piston, which may cause the pressure within the cartridge to rise. In other words, air would then be trapped and / or compressed within the cartridge, which would typically require venting. In any case, the cartridge contents are generally not intended to be in permanent contact with the air. For this purpose, a channel structure can be provided within the piston, which essentially fluidically connects the front and rear sides.Fluids are understood to be gases and liquids, so that gases and liquids can pass through a fluidic connection or a fluidic gap opening into the recess. Due to the channel structure, venting of the cartridge sealed by the piston can occur, provided the channel structure is not closed, at least temporarily.

[0017] The term recess is understood to mean a (through) bore, a material recess, a hole, a guide, a receptacle and / or a (fluidic) passage, in particular a (fluidic) passage from the front or rear side to the channel structure. The recess serves to receive or insert the closure element. The recess is preferably arranged centrally on the front side of the piston. In particular in the case of an approximately cylindrical or cylindrical-shaped piston, the recess can be arranged on the central axis of the piston, i.e. at least approximately centrally between the side surface of the piston. The central axis of the piston is understood to mean an axis which extends at least through the front and the rear side and is arranged at least approximately equally spaced from the side surface all the way around.The channel structure is understood to mean a bore, a material recess, a hole, a groove, a slot, and / or a (fluidic) passage, in particular a (fluidic) passage from the rear side to the front side and / or from the rear side or front side to the recess. The channel structure serves, at least essentially, for air transport or fluidic connection. The recess and the channel structure can have identical or similar features and / or can merge seamlessly into one another.

[0018] It should not go unmentioned that several, for example two, three, four or more, recesses can be provided on the front. Alternatively or additionally, a recess can also be provided on the rear, or two, three, four or more recesses can be provided on the rear. Independently of this or dependently, several channel structures can also be provided. Several channel structures can run, at least essentially, parallel and / or be connected to one another between the front and the rear. A recess which - deviating from the rule - is provided on the rear can be connected to the same channel structure to which a recess on the front, in particular one located opposite, is also connected.Overall, one or more of the aforementioned features can improve the venting, operability and reliability of the cartridge piston device.

[0019] The closure element can be inserted into one of the recesses to close the channel structure and can be adjusted from the open position to the closed position, and back again if necessary. In the open position, the channel structure is fluidically released, which means that fluid passage through the channel structure is possible, at least approximately unhindered. In the closed position, the channel structure is fluidically sealed, which means that fluid passage through the channel structure is only possible with hindrance or not possible at all. In particular, highly viscous fluids or pasty cartridge contents can no longer pass through the channel structure if the cross-section is suitably reduced in the area of ​​the channel structure, so that a certain cross-section reduction can also fall under the term closed position because a fluid in orHighly viscous contents of the cartridge that are stationary at the channel structure can ultimately effectively prevent the passage of the remaining cartridge contents and / or air through the channel structure.

[0020] Typically, the front side faces the cartridge or cartridge contents. The closure element inserted into the recess also faces the cartridge contents and can come into contact with them. Exceptions to this are also possible for the rear side to face the cartridge or cartridge contents; in this case, the recess on the front of the piston is accessible from the outside or from the back of the cartridge when the piston is inserted into the cartridge, allowing the closure element to be closed from the outside and / or manually.

[0021] In the open position, the closure element is, for example, non-positively secured or clamped against displacement in and / or against the insertion direction, such that the closure element is secured against falling out of the recess and / or against further insertion or adjustment. However, if a sufficiently high force is applied to the closure element in the axial direction or in the insertion direction, the closure element can be pushed further axially (and / or pulled out again). It is advantageous and preferred that the closure element is fixed in the open position and / or strikes, in particular strikes in the withdrawal direction, but that fluid passage past the closure element is not impeded.

[0022] In the closed position, the locking element is, for example, positively and / or non-positively secured or clamped against displacement / adjustment in the insertion direction and / or in the extraction direction.

[0023] Preferably, a clamping force acts between the piston and the closure element, particularly at least in the closed position. The clamping force can hold the closure element in its position, particularly because the clamping force can be directed transversely to the central axis and / or to the insertion or extension direction.

[0024] Alternatively or additionally, a locking connection and / or a snap connection is preferably provided between the closure element and the piston or the recess. The closed position—but also the open position—can be blocked or secured in such a form-fitting manner that pulling out in the extension direction is only possible with considerable force or is not possible at all, for example, caused by the locking connection and / or the snap connection, particularly by means of a snap ring.

[0025] According to a preferred embodiment of the invention, the closure element has a head side with an end face. The head side is understood to be a section of the closure element—preferably located on the outside along the center axis of the closure element—while the end face is understood to be a surface of the head side, or the outwardly facing surface. In particular, the head side is an at least substantially piston-shaped, cylindrical, and / or cylinder-shaped section on the closure element. The head side can preferably be designed as a lid, in particular as a planar lid.

[0026] The front face provides an engagement surface for applying force to the closure element as a whole, allowing it to be adjusted from the open to the closed position. The force can be applied either by the cartridge contents or manually. The front face is preferably arranged, at least substantially, parallel to the front and / or rear sides and / or transverse to the insertion or withdrawal direction to ensure user-friendly operation.

[0027] When the piston is pushed into the cartridge, the trapped air can initially escape through the piston (because the open position is then preferably achieved). It then depends on whether the front (case 1) or the back (case 2) is facing the cartridge contents. In the first case, when the front comes into contact with the cartridge contents, a force is exerted on the end face in the direction of insertion; then the closed position in particular - e.g. during venting and / or at the end of venting - is brought about by the closure element being pushed into the piston by means of force applied to the end face, while the piston is being pushed into the cartridge in the opposite direction. In the second caseIn this case, the closure element will not simply be adjusted, but rather the piston will only come to a standstill when the pressure in the ultimately vented cartridge increases; the closure element must ultimately be adjusted into the closed position manually, i.e. by hand and / or by means of a device which, for example, already inserts the piston. In one embodiment, it can be provided that the closure element is pushed into the piston by means of force application at the end face, and optionally, if complete closure in the closed position does not occur, the closure element can be moved into the closed position manually, e.g. at the base side. Alternatively, a combination of the first case and the third case can be provided.In this embodiment, the closure element is closed by applying force to the end face of the piston and the end face of the closure element. Optionally, an additional closure element can be provided on the piston, which allows renewed venting of the piston contents in this position. Preferably, the end face protrudes from the front, at least in the open position. It is then easily recognizable whether the open position is present or whether the open position is incorrectly set, particularly if the closed position does not involve such a pronounced protrusion of the end face or involves a different pronounced protrusion.

[0028] Alternatively or additionally, it is possible for a gap, particularly as part of a pre-channel structure, to be formed between the end face, in particular the head side, and the piston, in particular a recess of the piston, at least in the open position, which fluidically opens into the recess. A reliable venting function is provided via the gap, which just as reliably prevents fluid passage when the gap is closed in the closed position and / or is at least approximately closed.

[0029] Furthermore, alternatively or additionally, it is provided that, at least in the closed position, the end face is at least substantially flush with the front side or is recessed into the front side. Preferably, the head side can also be recessed further, at least in the closed position, than in the open position.

[0030] Each of these above options is intended to ensure that the closed position is clearly visible to the operator in order to avoid further operating errors, e.g. the erroneous insertion of the piston with the locking element in the closed position.

[0031] According to a further preferred embodiment of the invention, the head side and / or the end face and / or the rear side are designed to be at least substantially round and / or to correspond to a, in particular and / or at least substantially cylindrical, countersink in the recess. In particular, if the closure element corresponds, at least in sections, to the piston, for example, to the recess and / or to the countersink in the piston, the closure element can be inserted into the piston easily and with little risk of error, for example, to achieve the open and closed positions.

[0032] In preferred embodiments, particularly with sealing surfaces in the recess, the recess has a fluidic connection from the front of the piston to the rear of the piston, in particular the recess extends from the front of the piston to the rear of the piston. In particular with sealing surfaces provided inside the recess, which can be conical and / or cylindrical, for example, and interact with corresponding sealing surfaces of the closure element. The corresponding surfaces of the closure element can be designed as a sealing element, cone, taper, truncated cone, truncated cone section, cylindrical, or comprise polygonal surfaces. In an alternative embodiment, the recess can be designed as a blind hole, for example if the closure element has a rear side formed opposite the end face and the rear side acts as a sealing element.In particular, the end face and rear side of the head are designed as a cover, preferably as a planar cover. The plane of the cover of the closure element is preferably formed substantially perpendicular to the central axis of the closure element. The cover is preferably substantially planar, particularly at the end face and / or at the rear side. In a particularly preferred embodiment, the rear side acts as a sealing element in the closed position for sealing openings that fluidically correspond to the rear side of the piston.

[0033] It is helpful if the closure element, in particular the head and / or the end face, and / or the piston, in particular the recess and / or the countersink, are round and / or designed to correspond to one another and / or to be insertable into one another. This can prevent errors during use, e.g., incorrect insertion of the closure element.

[0034] The ratio of the end face of the closure element to the area of ​​the front side of the piston - without the portion of the end face of the closure element - is preferably from 1:5 to 1:20, more preferably 1:5 to 1:10. It is further particularly preferred if the end face of the closure element is essentially flat or planar. It is particularly preferably the case that the end face of the closure element does not deviate from a planar plane by more than plus / minus 0.1 to 5 mm. Furthermore, it is preferred if an imaginary plane, in particular a planar plane, in the end face, in particular a substantially planar end face, of the closure element is essentially perpendicular to the central axis of the piston. In the present case, essentially perpendicular is understood to mean angles of 81° to 90°, in particular of 85° to 90°.

[0035] The press-in force of the closure element with an end face, in particular with a planar end face, preferably with an end face of 0.3 to 5 cm or alternatively with a ratio of 1:5 to 1:20 of the end face of the closure element to the front of the piston, is preferably greater than 5 N, particularly preferably from 200 N to 500 N, preferably from 200 N to 300 N. Corresponding preferably means that at least in sections there is a geometric positive of one part / section and a geometric negative of the other part / section. If sections or parts correspond to one another, ie in particular the closure element to the recess and / or the head side to the countersink, narrow gaps can be realized if required and support for sealing or closing the channel structure can be made possible.

[0036] It is also possible for the countersink to have projections, for example on the edge. Alternatively or additionally, the projections of the countersink can correspond to recesses, for example on the edge, on the head side. Alternatively or additionally, it is possible for the countersink to have recesses and / or for the head side to have projections. The projections or recesses can be partially circular or semicircular, preferably with the corresponding central axis of the partial circle or semicircle being arranged parallel to the central axis of the piston and / or closure element. The projections and recesses can engage with one another in the manner of a toothing. In this way, the fluidic closure in the closed position can be further improved.This can also lead to simplified operation, particularly because less force may be required to adjust the closure element, and / or because incorrect insertion and / or incorrect adjustment of the closure element is made more difficult. One, two, three, four, or more projections or recesses can be provided, in particular arranged circumferentially.

[0037] In a further preferred embodiment, the closure element has a sealing element, in particular a cone, for sealing on a sealing surface of the recess. The sealing element is in particular a conical or truncated cone-shaped section of the closure element, preferably convex and / or circumferential. This ensures a secure and precise contact of the parts. A cone, a conical shape, or a truncated cone shape are particularly well suited for a flat and thus sealing contact between the parts, provided that at least one part or material involved has sufficient elasticity.

[0038] Alternatively or additionally, the sealing element comprises a sealing ring (e.g., an O-ring or sealing ring) or is formed by a sealing ring. In particular, the sealing ring can only bear against the closure element in the open position, and in the closed position—for fluidic sealing—can bear against both the closure element and the piston, in particular the recess, particularly preferably circumferentially on the closure element and piston.

[0039] In particular, the recess has a sealing surface. The sealing surface of the recess can be a conical or frustoconical section of the piston, preferably concave and / or circumferential. The sealing surface can also be, at least approximately and / or partially, cylindrical.

[0040] In the closed position, in particular around the central axis of the closure element, the sealing surface and the sealing element can be pressed and / or clamped and / or jammed against one another, in particular in such a way that a fluidic closure or sealing is present, that the channel structure is fluidically closed and / or that an adjustment of the closure element from the closed position in the extension direction is difficult or, at least approximately, impossible.

[0041] The sealing surface and the sealing element can be spaced apart from one another in the open position, in particular such that there is no fluidic closure or sealing and / or that the channel structure is not fluidically closed and / or that the channel structure is fluidically released.

[0042] In a further preferred embodiment, the closure element has a sealing auxiliary element, in particular a sealing lip, for contact with a further sealing surface of the recess, preferably wherein the sealing auxiliary element is arranged on the head side, in particular the end face and / or rear side, and / or circumferentially around the head side, in particular the end face and / or the rear side - in particular around the central axis of the closure element.

[0043] The auxiliary sealing element can open a gap between the piston and the closure element in the open position and / or close or seal it in the closed position. When the piston is in use in a cartridge, the auxiliary sealing element can reduce the pressure acting on the sealing element in the closed position, allowing the piston and closure element to absorb a higher overall pressure when the closure element is in the closed position. This can further improve reliability.

[0044] In a further preferred embodiment, the closure element has a securing portion for securing the closure element relative to the piston, in particular by means of a securing means of the piston, particularly preferably a snap ring of the piston. The securing portion and the securing means are preferably designed to correspond to one another, for example in the form of a clamping, play-related, and / or latching connection between the piston and closure element in the insertion or withdrawal direction. It is advantageous that the axial play between the securing portion and the securing means can provide adjustability between the open and closed positions and / or can ensure that the closure element cannot be pulled further out of the piston in the withdrawal direction in the open position.This prevents the closure element from being lost, especially when inserting the piston into the cartridge.

[0045] In particular, the securing section can be designed to run around the central axis of the closure element and / or as a recess, projection and / or locking lug and / or have this.

[0046] The securing means is, in particular, a part and / or section of the piston, for example, in the region of the recess and / or the channel structure. The securing means can be designed as and / or comprise a snap ring or retaining ring, a locking lug, and / or a projection.

[0047] A snap ring is present, for example, as an annular, circumferential projection in a recess of a component or on a circumferential outer surface of a component—whereby this component can be the piston and / or the closure element—and has radial mobility relative to the central axis of the component. This mobility is preferably achieved by elastic deformation of the snap ring itself. The snap ring is preferably formed by an annular, i.e., at least substantially circumferential, body that can be expanded and / or compressed.

[0048] The circumferential projection can, for example, be briefly widened and finally snap into the securing section in sections when the closure element is inserted into the recess and reaches the open position, and preferably remain in the securing section in the positions between the open position and the closed position. This then results, for example, in a positive connection between the piston and the closure element, acting in the insertion direction or withdrawal direction. In one alternative, the closure element is particularly preferably designed symmetrically about its central axis. Furthermore, the closure element comprises a head side, in particular a cylindrical head side, with a preferably flat end face, a sealing element, a guide section and optionally a taper. The end face can be arranged transversely, in particular perpendicularly, to the central axis of the closure element.An auxiliary sealing element can be arranged circumferentially around the head side, adjacent to the end face. This auxiliary sealing element is advantageously designed as a seal, sealing lip, or sealing lip with openings for fluid passage immediately before the closed position. The auxiliary sealing element preferably seals a circumferential groove around the head side of the closure element in the piston. The auxiliary sealing element is designed to seal the recess all the way around in the closed position, in particular. A sealing element can be adjacent to the rear side, opposite the end face of the head side. A sealing element designed as a cone or cylinder, optionally with at least one circumferential groove and / or circumferential sealing ring, can be adjacent to the rear side, opposite the end face.

[0049] The end face advantageously has a rear side that is opposite the end face of the closure element. Alternatively, the end face of the closure element has a rear side of the closure element that is opposite the end face of the closure element.

[0050] The closure element preferably has a securing section which is designed as a recess running around the central axis or as a projection running around the central axis. A securing means or a snap ring or also a retaining ring can engage in the recess and abut axially. Conversely, the projection running around the central axis can engage in a recess in the recess as a securing means. The guide section can be adjacent to the securing section. Advantageously, the guide section is designed to be circumferential and preferably at least partially cylindrical around the central axis. A taper can be connected to the guide section. The closure element is advantageously designed to be substantially complementary to the recess and countersink in the cartridge piston device. The recess is designed as a channel from the front side to the rear side, wherein the front side is on the media side orfacing the cartridge interior and optionally filled cartridge contents, and the rear side is arranged on the apparatus side or the delivery side. A further preferred embodiment of the invention provides that the closure element and / or the piston, in particular in the region of the recess and / or along the insertion direction or withdrawal direction, has a venting option, in particular comprising groove(s) or slot(s). The venting option can enable fluidic exchange between the front and rear sides of the piston, preferably when the closure element is in the open position.The venting option, for example, fluidically connects the recess to the channel structure when the closure element is in the open position; furthermore, preferably no fluidic exchange can take place via the venting option when the closure element is in the closed position, in particular because the venting option can, for example, be partially covered.

[0051] The venting option, in particular the groove or slot or also the grooves or slots, can extend on the closure element from the sealing element to an axial point on the closure element further away from the sealing element. If multiple grooves or slots are provided for the venting option, this applies to the individual grooves or slots. Alternatively or additionally, the venting option can extend from the sealing surface to a point further away from the sealing surface and / or towards the rear of the piston. In any case, the venting option does not have to be directly connected to the sealing surface or sealing element at one of its two ends, but can overlap or be spaced from the sealing surface or sealing element.

[0052] In particular, the closure element, at least in the open position, essentially blocks the cross-section of the recess, while the venting option provides a certain fluidic connection—e.g., for venting—along the closure element. In particular, the venting option provides a fluidic connection between the recess and the channel structure, particularly in the region where the cross-section of the recess is essentially blocked by the closure element.

[0053] A preferred embodiment of the invention is characterized in that the piston has a pre-channel structure on the front and / or rear side. A pre-channel structure is preferably understood to mean a further channel structure which is fluidically connected upstream and / or downstream of the channel structure - in particular directly or indirectly. The pre-channel structure particularly improves the venting function in that the air to be discharged can be taken up over a large cross-section and / or in a plurality of areas rather than just in the immediate area of ​​the recess and can be discharged or tapped off via the piston. Without a pre-channel structure, the area where air can be discharged at all would only be directly in the area of ​​the closure element and would therefore be comparatively small.

[0054] In particular, the pre-channel structure extends transversely, i.e., at least substantially perpendicularly, to the insertion direction or extension direction and / or to the central axis of the piston. Alternatively or additionally, the pre-channel structure at least substantially covers the front and / or the rear side and / or extends over the front and / or the rear side at least substantially flatly and / or in a star shape and / or is distributed particularly uniformly around the central axis.

[0055] The pre-channel structure can fluidically connect the front side and / or sections of the front side to the recess, the channel structure, and / or the rear side. Alternatively or additionally, the pre-channel structure can fluidically connect the rear side and / or sections of the rear side to the channel structure and / or the recess.

[0056] A further preferred embodiment is characterized in that the pre-channel structure, in particular on the piston, has recesses that are open to the outside and / or towards the cartridge and / or in the form of grooves, preferably wherein the recesses are arranged on or within the front side and / or the rear side, at least approximately, in a surface-covering and / or distributed manner.

[0057] The particularly constant width of the pre-channel structure can be in the range of 0.01 mm to 1 mm, preferably in the range of 0.1 to 0.5 mm, and particularly preferably the width is 0.2 mm + / - 10%. This is a sufficiently narrow value so that pasty cartridge contents, in particular, can penetrate the pre-channel structure only with difficulty or not at all.

[0058] The depth of the pre-channel structure or a recess in the pre-channel structure, in particular measured from a plane on the front side in the insertion direction and / or along the center axis of the piston, is in particular in the range of 0 to 10 mm, preferably 0.1 to 5 mm, in particular 2 to 4 mm. In particular, the pre-channel structure is less deep further away from the center axis than close to the center axis. The pre-channel structure can open into an edge recess near the outer side—in particular in a stepless manner—with the same, similar, or completely different depth.

[0059] In particular, the pre-channel structure faces or is open to the cartridge contents. If the pre-channel structure fluidically connects more than just the area of ​​the recess on the front side, preferably the central area on the front side of the piston, with the rear side - directly or indirectly - then even peripheral areas of the front side can be effectively vented.

[0060] A circumferential edge recess can be provided on the front and / or the rear, in particular on the respective side, in particular into which the pre-channel structure tapers gently or opens seamlessly. The edge recess improves venting because otherwise air can become trapped in the edge region without an edge recess when the cartridge is vented. The edge region preferably has an inner diameter and an outer diameter. The outer diameter corresponds in particular to the diameter of the piston. An edge region comprises, in particular without a wiper and / or without a recess, the inner diameter and the outer diameter. The pre-channel structure preferably opens at the inner diameter of the edge region, in particular as explained above in the edge recess. The edge recess can correspond to a venting groove.It may be further preferred if the edge recess extends at least partially to completely radially from the inner diameter to the outer diameter of the edge region and extends partially to completely, in particular circularly or with interruptions, in particular between the recesses of the pre-channel structure.

[0061] The diameter of the head side of the closure element is preferably at least 8 mm, preferably at least 10 mm. Furthermore, it is preferred if the diameter of the piston is greater than or equal to 20 mm and optionally less than or equal to 150 mm, in particular greater than or equal to 22 mm and optionally less than or equal to 100 mm. Further preferably, the front side of the piston has a diameter of greater than or equal to 20 mm, in particular greater than or equal to 22 mm and optionally less than or equal to 150 mm. Particularly preferably, the inner diameter of the edge region of the front side of the piston has a diameter of greater than or equal to 20 mm, in particular greater than or equal to 22 mm and optionally less than or equal to 150 mm, in particular less than or equal to 100 mm.

[0062] The ratio of the diameter of the head side of the closure element to the diameter of the piston, in particular the diameter of the front side of the piston, more preferably the inner diameter of the edge region of the piston is from 1:2 to 1:10, preferably from 1:3 to 1:7, particularly preferably 1:5, in particular with plus / minus 25%, in particular plus / minus 10%, preferably plus / minus 5%. A particularly preferred ratio of the diameter of the closure element, in particular the diameter of the cover of the head side, to the diameter of the edge recess, in particular to the inner diameter, is 1:5, in particular with a standard deviation of plus / minus 5%. The head side of the closure element, in particular the cover of the closure element, can have a surface, in particular end face, of 39 to 80 mm 2 preferably from 45 to 55 mm 2 , particularly preferably 50 mm 2, in particular a circular end face, preferably with a deviation of plus / minus 15%, preferably 5%.

[0063] The front of the piston may preferably have a surface area of ​​greater than or equal to 200 to 300 mm 2 , preferably from 220 to 270 mm 2 , particularly preferably 250 mm 2 in particular as a circular surface, preferably with a deviation of plus / minus 15%, preferably 5%.

[0064] The front side of the piston is preferably a maximum of five times larger, in particular at least a factor of 1.5 to 5, preferably a factor of 3 to 5, preferably 4 to 5, than the surface of the head side of the closure element, in particular the surface of the lid of the closure element. Preferably, the front side of the piston, particularly preferably the area of ​​the front side within the inner diameter of the edge region, is preferably a maximum of five times larger, in particular a factor of 1.5 to 5, preferably a factor of 3 to 5, preferably 4 to 5, than the surface of the head side of the closure element, in particular the surface of the lid of the closure element.

[0065] Furthermore, it may be preferred if the edge recess, in particular as a venting groove, has a width of 0.2 mm to 1 mm, preferably from 0.2 mm to less than or equal to 0.6 mm and / or a depth of less than or equal to 2 mm, in particular from 0.001 mm to less than or equal to 2 mm.

[0066] The pre-channel structure advantageously has a width of less than or equal to 0.6 mm, in particular from 0.001 to 0.6 mm, preferably from 0.2 to 0.6 mm and / or a depth of less than or equal to 2 mm, in particular from 0.001 mm to 2 mm, preferably from 0.01 to 2 mm. The pre-channel structure is preferably designed as a groove-shaped depression, in particular as an open groove-shaped depression. The pre-channel structure comprising the depressions, in particular groove-shaped depressions, can run from the center of the front side, in particular the recess and / or the countersink, into the edge region and open in particular into the edge depression of the edge region. The edge depression can be designed as a venting groove into which the depressions of the pre-channel structure open.It is further preferred if the total area of ​​the openings in the pre-channel structure, in particular the depressions in the pre-channel structure, and optionally the opening of the edge depression, in relation to the total surface area of ​​the piston, in particular the front side of the piston, preferably the total surface area of ​​the piston with edge region and optionally with edge depression, particularly preferably up to the outer diameter of the edge region, is less than or equal to 6%, preferably from 0.0001 to 6%, preferably from 0.01 to 6%, more preferably from 0.01 to 5%. In particular, the pre-channel structure is designed in such a way that a typical cartridge content can penetrate into the pre-channel structure only with difficulty or not at all, and in such a way that air can penetrate into the pre-channel structure. This is preferably achieved by sufficiently narrow channel-shaped, slot-shaped and / or groove-shaped geometric elements in the pre-channel structure, into which a fluid or liquid that is too viscous can flow.a pasty cartridge content can penetrate only with difficulty or not at all. Therefore, slot-shaped or groove-shaped recesses are particularly advantageous for venting the cartridge, especially as a pre-channel structure, but if necessary also or alternatively as a channel structure.

[0067] The pre-channel structure(s), in particular comprising recesses, can be arranged in a star shape on the front and / or rear of the piston. This means that the individual components of the pre-channel structure point outward approximately from the center axis of the piston or the center of the front / rear sides and are evenly distributed around the center axis or the center.

[0068] It is preferred if radially, in particular spoke-shaped or star-shaped from the center of the front side, in particular from the recess and / or from the countersink, at least two, preferably at least four, particularly preferably two to fifty outwardly open, in particular open towards the cartridge, groove-shaped depressions are formed, which form the pre-channel structure and in particular extend to the edge region, and open in the edge region, in particular in the present case in an edge depression running around the front side of the piston.

[0069] The same applies to the venting option(s), in particular comprising grooves or slots, which can be arranged in a star-shaped manner around the central axis, particularly in the channel structure. It can be assumed that the grooves or slots particularly preferably have the same structural design as recesses.

[0070] In a further preferred embodiment of the invention, the closure element and / or the piston is formed from one or more of the following materials: thermoplastic, elastomer, thermoplastic elastomer, or thermoset. The piston is preferably made from a thermoplastic, such as polypropylene (PP), polyethylene (PE), mixtures of PP and PE, or corresponding thermoplastics filled with inorganic fillers. The closure element can be made from a thermoplastic, preferably from a thermoplastic elastomer (TPE), and / or comprises this material. Typical thermoplastic elastomers include PP, PE, or mixtures thereof with latex or silicone.Examples include TPA (TPE-A), such as thermoplastic polyamide elastomers; TPC (TPE-E), such as thermoplastic copolyester elastomers; TPO (TPE-O), such as thermoplastic elastomers based on olefins, such as PP (EPDM); TPS (TPE-S), such as thermoplastic styrene block copolymers; and TPU (TPE-U), thermoplastic elastomers based on urethane. The aforementioned polymers can exist as homopolymers, copolymers, or block copolymers, as well as blends of these.

[0071] In particular, if the closure element is made of a softer or more elastic material than the piston, the sealing function in the closed position can be well achieved, and the locking or jamming of the closure element, especially in the closed position, can be further improved. Any configuration of the three features: "pre-channel structure," "channel structure," and "venting option" can be applied to any other feature of the three features mentioned.

[0072] The venting option and / or the pre-channel structure can, alternatively or additionally, be a component of the channel structure or the recess, or be a component of both. Therefore, when referring to the channel structure and / or the recess, reference can also be made to the venting option or the pre-channel structure. In other words, there may be a fluid transition or a not clearly defined transition between the recess (including the recess), the channel structure, the pre-channel structure, and / or the venting option.

[0073] According to an alternative, the closure element can be designed to be, at least essentially, rigid or inflexible. In particular, rigid or inflexible means that there is no essential and / or design-related elastic deformability of the closure element. Rigid or inflexible also implicitly and in particular means that the closure element, at least essentially, always has approximately identical functionality regardless of the material, provided the material used has closed pores. The closure element can therefore be made of metal, plastic or ceramic. This material-related idea arises from the fact that the materials listed, which differ greatly in their properties (density, hardness, modulus of elasticity, notch impact energy, etc.), are designed to be compatible purely on the basis of their geometry and not on the basis of their rigidity or flexibility resulting from these properties.Flexibility, can function as a closure element. According to likewise preferred embodiments, the closure element can have a core made of a rigid material and a coating over the core made of flexible material. In a further alternative, the closure element is formed integrally from an elastic, thermoplastic material, such as TPE. Preferably, all sealing surfaces of the closure element and / or the piston are formed from elastic, thermoplastic material or are coated therewith. Thus, a guide section, which simultaneously functions as a seal, can also be made of an elastic, thermoplastic material.

[0074] The closure element and / or the piston can each be manufactured as one, in particular one-piece component, preferably an injection-molded component.

[0075] In particular, the closure element can have a guide section. The guide section can be a section that is separate from other sections or parts of the closure element and / or runs around the central axis. However, the guide section can also be formed by a plurality of non-circumferential sections or locations on the closure element. In particular, the guide section can be located at least substantially opposite the head side and / or end face. The guide section can in particular border on a taper of the reinforcing element, which facilitates insertion into the recess. The guide section of the closure element can be rigid or elastic. According to a preferred alternative, the closure element is formed in one piece from a thermoplastic elastomer. In a further alternative, the closure element can be designed in several parts and, for example,a rigid core and optionally a rigid core in the head side, which is covered by elastic material, in particular an elastic thermoplastic.

[0076] A clamping force, particularly in the closed position, between the piston and the closure element can result from the closure element being oversized relative to the recess, particularly at the guide section. This oversize results, for example, in static friction between the piston and the closure element when the closure element is inserted into the recess, particularly in the area of ​​the guide section, which must be overcome when adjusting the closure element.

[0077] A wiper can be provided around one or the edge of the front and / or rear side and / or on the outside for contact and sealing against an inner surface of a cartridge. The wiper can wipe from the inner surface of the cartridge. Multiple wipers can also be provided. A sealing lip can also be provided as a wiper. The sealing lip can face the front or rear side. In particular, the wiper can run, at least substantially, parallel to and / or adjacent to the sealing groove or seal.

[0078] A further proposal is that a particularly unfilled cartridge, preferably having a piston opening for a cartridge piston device, is provided together with a cartridge piston device. This allows a user to benefit from the advantages of the invention mentioned in the application, for example, by only needing to fill the cartridge and / or insert the provided piston with the closure element in the open position.

[0079] Due to the simple and reliable venting function of the proposed cartridge piston device or the cartridge, even very sensitive cartridge contents or impression materials can be stored in a cartridge because venting can be carried out particularly easily and quickly.

[0080] Each feature mentioned in the singular can also be used in a plurality and produce synergistic advantages; likewise, features mentioned in the plural can advantageously be provided in the singular; this need not be explicitly referred to in individual cases. In particular—to provide a non-exhaustive list—single or multiple: venting options, pre-channel structures, channel structures, recesses, sealing surfaces, countersinks, closure elements, end faces, head sides, rear sides, securing sections, guide sections, sealing elements, tapers, and so on, can be provided. Particular reference is made here to the list of reference symbols.

[0081] The invention further relates to a method for venting and closing a cartridge with a cartridge piston device. The cartridge piston device can have a piston having a channel structure and a closure element for closing the channel structure by inserting the closure element into a recess in the region of the front of the piston, which can be transferred into a closed position by adjusting the closure element or can be designed according to the preamble of claim 1 or can be designed according to one of the remaining claims. The method can comprise the following method steps: a. Providing a cartridge, in particular a cartridge filled with cartridge contents, with a piston opening, b. Providing the cartridge piston device, in particular with the closure element inserted into the recess and / or in an open position, c.Inserting the cartridge piston device into the piston opening, wherein an / the open position is present, d. Venting the cartridge by pushing in the cartridge piston device, wherein the closure element is held fixed by the recess and / or can be or can strike in the pull-out direction, and, preferably, in particular venting the cartridge by pushing in the cartridge piston device until the front comes into contact with a cartridge content, preferably further pushing in the cartridge piston until there is essentially no more air-filled volume between the piston content and the front of the cartridge piston, wherein preferably the pushing in of the cartridge piston takes place until the closure element is moved into the closed position by the cartridge content, in particular by the pressure building up of the cartridge content, on the closure element, e.Closing the cartridge by moving the closure element into the closed position by contact of the cartridge contents with the closure element and / or by applying force to the closure element, preferably during or after step d, in particular automatic or self-closing, and optionally f. preferably maintaining the closed position of the cartridge piston device.

[0082] In step e, the closing preferably takes place automatically or independently, in that the cartridge piston device is pushed into the cartridge filled with cartridge contents by a drive shaft in the direction of the medium and the closure element is pushed into the piston automatically by the force exerted by the cartridge contents (on the media side).

[0083] Individual features of the cartridge piston device or the cartridge are applicable accordingly to the aforementioned method and use. The advantages apply accordingly.

[0084] The invention further relates to a kit comprising a cartridge and at least one cartridge piston device, in particular comprising one or two cartridge piston devices and a single-chamber or double-chamber cartridge. The invention also relates to a closure element for use with a piston, wherein in particular a piston with an inserted closure element forms a cartridge piston device, wherein the closure element has a head side with an end face, a rear side opposite the end face, and a sealing element. The head side is preferably designed as a lid, in particular as a lid with a planar rear side opposite the end face of the head side. The closure element comprises a head side, at least one sealing element, optionally a securing section, optionally a guide section, and optionally a taper and optionally a second guide section.

[0085] According to an alternative embodiment, the closure element has an opening on its head side, which extends from the end face to the back of the head side and is optionally guided through the closure element to the opposite end of the closure element, wherein in particular the opening on the back of the closure element opposite the end face has at least three elements, each having at least one sealing surface, preferably at least two sealing surfaces, which are formed from the outer circumference of the elements towards the opening and by external force acting on the outer surfaces of the elements, the sealing surfaces of the elements come to lie on one another and thereby close the opening on the side of the closure element facing away from the end face.

[0086] Wherein the at least three elements, in particular in the initial position or the open position in the piston, have an approximately cylindrical circumference, and in particular in the closed position after insertion into a conical recess of the piston, the sealing surfaces of the elements come to rest on one another and close the opening in a fluid-tight manner, in particular in the closed position.

[0087] In this embodiment, the piston has a cylindrical recess extending from the front to the interior of the piston and from there at least partially conically to the rear. The protruding closure element can be inserted into this recess and, when inserted into this recess, closes the recess and the opening of the closure element for fluid passage, in particular, the closed position is reached.

[0088] The invention also relates to a piston for insertion into a cartridge, which has a front side, a rear side facing away from the front side, an outer side with a circumferential sealing groove and / or seal for circumferential sealing on an inner surface of the cartridge, with a recess in the region of the front side for inserting a closure element in an insertion direction, and optionally a channel structure fluidically connecting the recess and the rear side for venting the cartridge, and the piston in the direction of the front side has a support surface formed substantially perpendicular to the central axis of the piston, in particular in a recess on the front side of the piston, for the rear side of the closure element, which is opposite the end face of the closure element.

[0089] Furthermore, the object is achieved by using a cartridge piston device for insertion into a cartridge and closing the rear of this cartridge. The cartridge piston device comprises a piston having a channel structure and a closure element for closing the channel structure by inserting the closure element into a recess in the piston and by adjusting the closure element to a closed position, or is particularly designed according to the preamble of claim 1 or according to one of claims 1 to 10. Closing the cartridge involves adjusting the closure element to the closed position, wherein the adjustment occurs through contact of one and / or the cartridge contents with the closure element and / or through the introduction of force onto the closure element.

[0090] The invention will be explained below by way of example with reference to the accompanying drawings using preferred embodiments, wherein the features presented below can represent an aspect of the invention both individually and in combination. They show:

[0091] Fig. 1A-C: a cartridge piston device inserted into a cartridge filled with cartridge contents before venting in an open position (Fig. 1 A), during venting (Fig. 1 B) and after venting in a closed position (Fig. 1C) in a partially sectioned side view,

[0092] Fig. 2: a closure element in a side view,

[0093] Fig. 3A: a piston in a plan view,

[0094] Fig. 3B: another piston in a partial plan view, Fig. 4A: the cartridge piston device, consisting of the closure element and the piston of Fig. 2 and Fig. 3A, with the closure element inserted into a piston in an open position in a partially sectioned side view,

[0095] Fig. 4B: the cartridge piston device of Fig. 4A with the closure element in a closed position in a partially sectioned side view, and

[0096] Fig. 5A-C another cartridge piston device according to the invention in a view from the rear (Fig. 5A), from the outside (Fig. 5B) and from the front (Fig. 5C).

[0097] Fig. 1A-C show a cartridge piston device 1 with a piston 2 and a closure element 3, which is inserted or pushed into a cartridge 4. The cartridge 4 is filled with cartridge contents 5, a highly viscous or pasty mass, and is at least substantially cylindrical. One or the front side 7 of the piston 2 faces the cartridge contents 5, with one or the opposite rear side 8 of the piston facing away from the cartridge contents 5. Not shown, but also possible, for the rear side 8 of the piston 2 to face the cartridge contents 5 or come into contact with the cartridge contents 5.

[0098] The piston 2 seals at the contact points with an inner surface 6 of the cartridge 5 in the region of the outer side 9 of the piston 2 by means of a seal 13 designed as an O-ring which is inserted into a sealing groove 12. Furthermore, wipers 14 which are in contact with the inner surface 6 ensure that no - or at least essentially no - cartridge contents 5 come into contact with the seal 13. The closure element 3 is shown in Fig. 1A in an open position relative to the piston 2 and axially guided and received in a recess 11 of the piston 2, whereby a fluidic connection is possible via the recess 11 via a channel structure 10 in the piston from the front side 7 facing the cartridge contents 5 to the rear side 8 facing away from the cartridge contents. The fluidic connection present in the open position can be used to vent any remaining cavity 34 during displacement orAdjustment of the piston 2 with the closure element 3 along a central axis 15 in the cartridge, in particular as long as the closure element 3 is not in contact with the cartridge contents 5.

[0099] In Fig. 1B, the closure element 3 is in contact with the cartridge contents 5 via its head side 17, which has an end face 16, and is still in the open position. In this position, any further adjustment of the cartridge piston device 1 along the central axis 15 (see Fig. 4A) of the cartridge 4 in the direction of the cartridge contents 5 causes a force to be applied to the closure element 3 in the axial direction or in an insertion direction 18 of the closure element 3 relative to the piston, since the cartridge contents 5 resist the penetration of the closure element 3.Since the force on the cartridge piston device 1 for inserting the cartridge piston device 1 into the cartridge 4 is typically applied to the rear side 8 of the piston 2, the gradual application of force to the closure element 3 from the cartridge contents 5 can lead to a pressure increase in the region of the cartridge contents 5 and to a displacement of the closure element 3. The closure element 3 can then be adjusted from the open position shown in Fig. 1B to a closed position shown in Fig. 1C, particularly if the force application is large enough.

[0100] Because adjusting the closure element 3 in the piston 2 or in the recess 11 requires a certain amount of force to be applied (because the closure element is guided and held fixed or clamped by a guide section 20), further venting of the cartridge 4 will initially take place before the closure element 3 can at least approximately reach the closed position. Thus, in the transition from the state in Fig. 1B to Fig. 1C, both flow and deformation of the pasty cartridge contents 5 will occur, in particular around the closure element 3 or the head side 17 (see Fig. 1A) and / or on the front side 7, and a subsequent adjustment of the closure element 3 into the closed position will take place. The closure element 3 in the closed position, as shown in Fig. 1C, causes the cartridge contents 5 orFluid passage from the front side 7 to the rear side 8 of the piston is no longer possible because the channel structure 10 in the piston is fluidically sealed by sealing the closure element 3 in the piston or in the recess 11. The closure element 3 is immersed in a recess 21 in the piston 2 and still protrudes slightly from the front side 7.

[0101] Fig. 2 shows an individual closure element 3 of a further cartridge piston device 1 according to the invention. The closure element 3 is designed symmetrically about its central axis 22. A cylindrical head side 17 with a flat end face 16 is arranged on an outer side of the closure element 3 along the central axis 22. The end face 16 is arranged transversely, or more precisely perpendicularly in this case, to the central axis 22. A sealing auxiliary element 23, which in this case is designed as a sealing lip 23, is arranged circumferentially around the head side 17, adjacent to the end face 16. The sealing auxiliary element 23 can seal circumferentially, for example in a recess 21. A sealing element 24 designed as a cone 24 adjoins the rear side 49, opposite the end face 16 of the head side 17. The sealing element 24 is circumferential around the central axis 22 and is optionally convex.The sealing element 24 is reminiscent of the shape of a countersunk head. Not shown is a sealing element 24 that is at least substantially circumferential and cylindrical (here: instead of conical) and / or has at least one sealing ring or O-ring.

[0102] Furthermore, the closure element 3 has a securing portion 25, which is designed as a recess 25 extending around the central axis. A securing means 26 (see Fig. 4A) or a snap ring 26 (see Fig. 4A) or even a retaining ring can engage and axially engage the recess 25.

[0103] The closure element 3 has a guide section 20, which in this case adjoins the securing section 25. The guide section 20 is designed such that it can be inserted into a recess 11 and is suitable for guiding the entire closure element 33 (see Fig. 4A), for example, along the central axis 22. For this purpose, the guide section 20 is circumferential and preferably at least partially cylindrical around the central axis 22.

[0104] Not shown is that one or more guide sections 20 can alternatively or additionally be arranged at a different axial location on the central axis 22 (a different location than, for example, in Fig. 2) of the closure element 3. For example, the guide section 20 can also be adjacent to the sealing element 24 or to the head side 17. Not shown, but also possible, is the provision of multiple guide sections 20.

[0105] The closure element 3 has a taper 27, which in this case is frustoconical or frustoconical-segment-shaped (i.e., as a truncated cone or truncated cone segment). The taper 27 assists in inserting the closure element 3 into a corresponding recess 11 (not shown in Fig. 2) for the closure element 3. Because the taper 27 and optionally a second guide section 58 in this case adjoin the guide section 20 and essentially form the end of the closure element 3 opposite the head side 17, the closure element 3 can be inserted into the corresponding recess 11 with the taper 27 first and brought into a guided position directly via the guide section 20. The corresponding recess 11 (not shown in Fig. 2) has in at least one section a radius 28 which at least substantially corresponds to the radius 30 of the guide section or is minimally smaller (ieby up to 0.1%, 1%, or 5%) than this. The rear side 49 of the head side 17, opposite the end face 16, can also act as a sealing surface. A second guide section 58 can be connected to the taper 27, which can serve to center the closure element in the insertion direction.

[0106] The illustrated and, in this respect, preferred closure element 3 is preferably designed as an injection-molded component, which has been produced, for example, using a (not illustrated) at least two-part injection molding tool. The at least two-part injection molding tool can open and close transversely to the central axis 22 of the closure element 3, in particular because the contour of the closure element 3 has no undercut along the central axis 22 and / or is rotationally symmetrical about the central axis 22.

[0107] Fig. 3A shows a piston 2 according to the invention with a recess 11 in the region of a front side 7 for inserting the closure element 3 in the insertion direction 18 (into the plane •). The piston 2 is round and essentially cylindrical, wherein the recess 11 is arranged centrally on a central axis 32 of the piston 2. The insertion direction 18 lies on the central axis 32 and points into the plane shown or is perpendicular to it. The recess 11 is basically formed by a bore in the piston 2 with different diameters in some sections. The recess 11 has a conical sealing surface 33 which corresponds to the sealing element 24, designed as a cone 24, of the closure element 3 in Fig. 2. Furthermore, the recess 11 has an essentially cylindrical countersink 21. The recess 21 corresponds to the end face 16 of the closure element 3 of Fig. 2.

[0108] From the center of the front side 7, recesses, in particular sixteen recesses 35, of a pre-channel structure 35 extend in a star shape to the edge region 36 of the piston, where the recesses 35 open into a circumferential edge recess 37. The recesses 35 are slot-shaped or groove-shaped, i.e., designed as slots and / or grooves. In this case, the recesses 35 are each several times deeper (into the plane shown) than the recesses 35 are wide, in particular by two to twenty or even thirty times, or any multiple in between.

[0109] In the present case, the depressions 35 near the central axis 32 are also deeper than those further away from the central axis 32. Adjacent to the countersink 21, an individual depression 35 is twice as deep (there is a depth 38) as at its end facing away from the central axis, where the depression 35 has the greater depth 39. In the present case, the depth 38, 39 of the depression 35 increases from the edge region 36 up to the recess 11. The depths 38, 39 are to be measured at least approximately adjacent to one end of an individual depression 35, for example, a maximum of 10%, 5%, or 2% from the end relative to the total length of the individual depression 35.

[0110] In the edge region 36 of the piston 2, at the end of the recesses 35 facing away from the central axis 32 or near the outer side 9, the peripheral edge recess 37 is provided on the front side 7, into which the recess 35 also tapers gently or opens seamlessly. The width 40 of the pre-channel structure 35 or recess 35 is at least approximately constant in each case.

[0111] From the center of the front side, 7 grooves or slots 41 of a venting option 41 extend in a star shape from the recess 11 or also from a channel structure 10 of the piston 2 adjacent to the recess 11 at a lower level. Eight grooves or slots 41 are provided. The components of the venting option 41 are designed as slots 41 and / or grooves 41 and run at least substantially parallel to the recess 11 and the channel structure 10, i.e., into the plane shown. In the present case, the venting option 41 has a depth 42 and width 43 that are at least substantially similar or identical to the pre-channel structure 35.

[0112] Not shown are the following preferred design options for the venting option 41 for good fluidic permeability with regard to venting and the poorest possible fluidic permeability of, in particular, pasty cartridge contents 5. The depth 42 and / or width 43 is preferably selected to be constant, wherein an inlet or outlet with different depths 42 and widths 43 can be provided at the end of the venting option 41. For example, the depth 42 can be selected in the range from 0.1 mm to 5 mm or in the range from 0.5 mm to 3 mm, in particular in the range from 1 mm to 2 mm. The width 43 can be selected in the range from 0.01 to 2 mm or in the range from 0.05 to 1 mm, in particular in the range from 0.1 mm to 0.5 mm.

[0113] In Fig. 3A (but also Figs. 1A-C and 4A-B), a wiper 14 designed as a sealing lip is provided on the piston, running all the way around the edge of the front side 7 and the rear side 8, which wiper can wipe cartridge contents 5 from an inner surface 6 of a cartridge 4 because it has an at least circumferentially linear end face and can lie tightly against an inner surface 6 or can even be pressed against it. The wiper 14 can be pressed in slightly in a resilient manner in the direction of the central axis 32, running all the way around the central axis 32. The wiper 14 on the front side 7 points towards the front side 7 and away from the rear side 8. The wiper 14 on the rear side 8 points towards the rear side 8 and away from the front side 7. The piston 2 shown in Fig. 3B is further developed compared to the piston 2 of Fig. 3A in that four edge-side projections 49 are provided on the edge of the recess 21.The projections 49 can correspond to corresponding (not shown) recesses 23 on the closure element 3 or on its head side 17. The recesses 23 can be provided, for example, at the location / in the region of the auxiliary sealing element 23 and / or as the auxiliary sealing element 23 and / or in addition to the auxiliary sealing element 23 on the closure element 3. The recesses 23 can be provided circumferentially and / or distributed on the head side 17 and / or correspond to the projections 49.

[0114] Not visible in Fig. 3A-B, but present, is a rear side 8 of the piston 2, which faces away from the illustrated front side 7 of the piston and is arranged parallel to the front side 7. An outer side 9 of the piston 2 is provided circumferentially around the front side 7 and the rear side 8. The outer side 9 is intended in particular for circumferential sealing against an inner surface 6 (not shown) of a cartridge 4 and, for this purpose, has a sealing groove 12 (not visible) with a seal 13.

[0115] In Fig. 4A, the closure element 2 of Fig. 2 is shown inserted into the piston of Fig. 3A, thus completing or assembling the cartridge piston device 1. The cartridge piston device 1 is further inserted into a cartridge 4 filled with cartridge contents 5, wherein the front side 7 of the piston 2 faces the cartridge contents 5 and is spaced from the cartridge contents 5, so that an air-filled cavity 34 remains. The recess 11 has the present cylindrical countersink 21 with a further sealing surface 47, the conical sealing surface 33, and the securing means 26 designed as a snap ring 26. There is a smooth transition from the recess 11 to a channel structure 10 fluidically connected to the recess 11 because the channel structure 10 has, at least substantially, the same radius 29 or diameter or cross section as a section of the recess 11 as radius 28 or diameter.

[0116] In this case, the closure element 3 in Fig. 4A is in an open position relative to the piston 2, wherein the cross-section of the channel structure 10 is essentially fluidically blocked due to the guide section 20, but the venting option 41 designed as a groove 41 ensures a fluidic passage past the closure element 3. In the illustrated open position, the closure element 3 is adjustably guided into a closed position that fluidically closes the channel structure 10 because the closure element 3 is displaceable relative to the piston to the right (along the central axes 15, 22, 32 and in the insertion direction 18) in Fig. 4A.

[0117] To provide the open position, the closure element 3 of Fig. 4A-B can abut against a securing means 26 designed as a snap ring 26 with the securing portion 25 in the extension direction 19 in the recess 11 in the open position. The securing means 26 is inserted into a groove circumferentially extending around the central axis in the region of the recess 11.

[0118] To provide the open position, the closure element 3 of Fig. 4A-B is held fixed in the recess 11 by clamping in the region of the guide section 20 in the open position. A force in the insertion direction 18 can be applied to the closure element 3 via the end face 16 of the closure element 3, which is oriented transversely to the central axes 22, 32 of the piston 2 and the closure element 3. The insertion direction 18 points toward the rear side 8 of the piston 2 and, in this case, runs parallel to the central axes 15, 22, 32.

[0119] An extraction direction 19 is arranged opposite to the insertion direction 18. When the closure element 3 is moved in the insertion direction 18 relative to the piston 2, the head side 17 dips into the recess 21, and the auxiliary sealing element 23 comes into contact with the edge of the recess 21, on which a further circumferential sealing surface 47 is arranged, and seals there. Furthermore, a gap 44 between the head side 17 and the bottom of the recess 21 narrows, via which a fluid passage to the recess 11 and to the channel structure 10 for venting is ensured.

[0120] In Fig. 4A-B it can be seen that the pre-channel structure 35 is less deep near the outer side 9 or in the edge region 36 than near the recess 21. This improves the venting function and the manufacturability because the pre-channel structure 35 can clog less quickly and because an averagely lower aspect ratio (depth / width) of grooves is generally easier to manufacture.

[0121] The outer side 9 is provided with a sealing groove 12 running around the outer side and a seal 13 contained in the sealing groove 12. The seal 13 is in this case an O-ring 13. Wipers 14 are provided on the outer side 9 in the edge regions 36, which are intended to prevent cartridge contents 5 from escaping by wiping against the inner surface 6 of the cartridge 4, in particular by the wipers 14 being in continuous, circumferential contact with the inner surface 6. The piston 2 has a diameter 45 of 60 mm + / - 6 mm in this case. Not shown, but diameters 45 in the range from 10 mm to 200 mm or any whole number of diameters 45 in between are also possible. The diameter is usually selected depending on the diameter of a corresponding cartridge 4.

[0122] The piston has a thickness 46 of 15 mm + / - 1.5 mm in this case. Not shown, but also possible, are thicknesses 46 in the range from 5 mm to 100 mm, or any single integer value of the thickness 46 in between. The selected thickness 46 depends largely on the material used, the diameter 45 used, and the resistance to deformation of the cartridge contents 5.

[0123] The pre-channel structures 35 have a width 40 of 0.2 + / - 0.15 mm in this case. The depth 38, 39 of the pre-channel structures 35, measured along the central axis 32 of the piston 2 and measured from the plane of the front side 7 of the piston 2, measures at one end from 4 mm + / - 1 mm as depth 39 in the edge region 36 or near the outer side or the edge recess 37, to 2 mm + / - 0.5 mm at the other end, i.e., near the recess 21, as depth 38.

[0124] Fig. 4B shows the cartridge piston device 1 of Fig. 4A in a closed position, wherein the cartridge contents 5 have pressed the closure element 3 into the closed position. The closure element 3 is inserted along the central axes 15, 22, 32 in the insertion direction 18 until the rear side of the head side 17 abuts the bottom of the recess 21 and until the sealing element 24 abuts the sealing surface 33. The sealing element 24 seals on the sealing surface 33 against fluid passage along the closure element through the recess and through the channel structure. In addition, the auxiliary sealing element 23 or the sealing lip 23 in the recess 21 seals circumferentially around the end face 16 in the recess 21 at a further circumferential sealing surface 47. The annular gap 44 between the head side 17 and the bottom of the recess 21 is closed or (temporarily) not present.The securing means 26 is located in the securing section 25, but does not strike against the securing section 25, but in this position is only designed or capable of striking against the securing section 25 in the extension direction 19.

[0125] Fig. 4B also shows the cartridge contents 5, which pressed or adjusted the closure element 3 into the closed position in the recess 11 via the end face 16 when the cartridge piston device 1 was pushed in (with the adjustment element 3 originally in the open position, not shown). This resulted in the venting of the cartridge 4 or an escape of air from the cavity 34 of the cartridge 4 by means of the pre-channel structure 35, via the gap 44, via the venting option 41 past the closure element 3 and out of the channel structure 10 of the piston 2 at the rear side 8, until finally - as shown - the closed position was or is present.

[0126] What is remarkable about Fig. 4B is that the cartridge contents 5 penetrated into the pre-channel structures 35 despite its high viscosity and despite the narrow width or high aspect ratio of the pre-channel structures 35. Advantageously, the penetration also occurred from the outside to the inside due to the depth 38, 39 of the pre-channel structures 35 increasing from the outside to the inside, so that the air to be discharged from the cavity 34 was gradually and completely discharged.

[0127] Not shown is an embodiment of a cartridge piston device 1 in which no pre-channel structures 35 are provided, in particular none on the front side 7.

[0128] In Figs. 1A-C and 4A-B, the cartridge 4 shown has a piston opening 48 on the rear side, into which the cartridge piston device 1 can be axially inserted and inserted. On the side opposite the piston opening 48 (front side), but particularly at the remaining locations of the cartridge apart from the piston opening 48, no further piston opening is shown, although this is typically provided.

[0129] As shown in Fig. 1 AC, the cartridge 4 further comprises a front valve 49 as a further piston opening, in particular for removing the cartridge contents 5.

[0130] In particular, a further piston opening and / or a valve 49 are / is generally arranged, in particular on the front side of the cartridge 4 and / or are provided for use of the filled, vented and closed cartridge 4, typically because the cartridge contents 5 are to be pressed out of the cartridge upon further insertion of the cartridge piston device 1 or the piston 2.

[0131] 5A-C show various views of a further embodiment of a cartridge piston device 1 according to the invention. The head side 17 of the closure element 3 is designed as a lid 17B, in particular with the diameter 17A of the head side of the closure element. The cartridge piston device 1 shown in Fig. 5A-C is designed for insertion into a cartridge 4 and for venting and closing the rear of the cartridge 4. Fig. 5A shows a piston 2 from its rear side 8, wherein a closure element 3 is inserted into a recess 11 in the region of the front side 7 (see Fig. 5C) on a front side 7 facing away from the rear side 8 (see Fig. 5C) and is visible through a channel structure 10 located centrally on a central axis 22, 32. More precisely, a taper 27 of the closure element 3 can be seen, which in the present case is designed as a truncated cone section 27.The closure element 3 is in an open position, allowing a fluidic passage or a fluidic connection, particularly for venting a cartridge 2, from the rear side 8 through the channel structure 10 past the closure element 3 to the front side 7. The rear side 8 (or also the front side 7, which is not visible) is encircled or surrounded by an outer side 9; in other words, the outer side 9 encircles the rear side 8 as well as the front side 7 (see Fig. 5C).

[0132] Fig. 5B shows the cartridge piston device 1 from the side or outer side 9. Located around the outer side 9 is a sealing groove 12 and therein a seal 13 or an O-ring 13 for circumferential sealing against a cartridge wall (not shown) or an inner surface 6 of a cartridge 4. The seal 13 protrudes radially from the outer side 9. In addition, two wipers 14 are arranged around the outer side 9, which can rest against a cartridge wall or inner surface 6 of a cartridge 4 and can be elastically pressed in radially. The two wipers 14 are located in the area of ​​the outer side 9 located at the front side 7 and face the front side 7 or point in the direction of the front side 7; opposite or in the area located at the rear side 8, the outer side 9 is at least substantially cylindrical.The closure element 3 protrudes from the front side 7 because it is arranged in the open position. The closure element 3 is adjustably guided in an insertion direction 18, which points from the front side 7 to the rear side 8, into a closed position that fluidically seals the channel structure 10. To provide the open position, the closure element 3 is held non-positively fixed in the recess 11 by clamping it by means of its guide section 20 (not visible). Furthermore, in the extension direction 19, the closure element 3 abuts against a securing means 26 in the recess 11 by means of its securing section 25 (not visible in Fig. 5A-C).

[0133] Fig. 5C shows the cartridge piston device 1 viewed from the front side 7, with the closure element 3 inserted in the recess 11 and in the open position. A flat, round end face 16 is located on the closure element 3 and at least substantially parallel to the front side 7; the end face 16 is part of a cylindrical head side 17 of the closure element 3. Between the head side 17 and a round recess 21 arranged centrally on the front side 7, which is cylindrical and corresponds to the head side 17, in particular the end face 16 and / or the rear side (the recess 21 is completely covered by the head side 17 in the illustration in Fig. 5C), a gap 44 is formed in the illustrated open position, which is at least substantially parallel to the front side 7 (and is also covered).Furthermore, an auxiliary sealing element 23, designed as a sealing lip 23, is arranged circumferentially around the head side 17, adjacent to the end face 26. The auxiliary sealing element 23 can provide a circumferential seal in the recess 21, particularly in a closed position of the closure element 3 (not shown).

[0134] In the closed position (not shown), the gap 44 is closed or no longer present. In the closed position, in an alternative, the closure element 3, in particular the head side 17, does not protrude from the front side 7 and is flush with the front side 7 or is recessed into the front side, in particular because the closure element 3 has been pressed into the piston 2 along the insertion direction 18.

[0135] Radially, in particular spoke-shaped or star-shaped, from the center of the front side 7, in particular from the recess 11 and / or from the countersink 21, at least two, preferably at least four, particularly preferably two to fifty outwardly open, groove-shaped depressions 35 open towards the cartridge 4 (not shown) extend and form the pre-channel structures 35 up to the edge region 36, and in particular in the present case open into an edge depression 37 running around the front side 7. Radially, in particular spoke-shaped or star-shaped, from the center of the front side 7, in particular from the recess 11 and / or from the countersink 21, twenty-four outwardly open, groove-shaped depressions 35 or pre-channel structures 35 open towards the cartridge 4 (not shown) extend in Fig. 5C up to the edge region 36 and thus in the present case open into an edge depression 37 running around the front side 7.In principle, the depressions 35 can also run from the center of the front side 7, in particular the recess 11 and / or the countersink 21, into the edge region 36 and have any desired shape, such as, for example, serrated, jagged, ladder-shaped and / or herringbone pattern, etc. The depressions 35 are arranged at least approximately across the entire surface and distributed over the front side 7, so that ventilation can be carried out over a large area. In the vicinity of the edge region 36 of the front side 7, the pre-channel structures 35 are twice as deep (depth 39 is 4 mm there) as in the vicinity of the countersink 21 (depth 38 is 2 mm there). The pre-channel structures 35 have a width 40 of 0.2 mm, in particular from 0.2 mm to 1 mm, preferably less than or equal to 0.6 mm. One of the wipers 14 can be seen surrounding the front side 7. The pre-channel structures 35 are located on the front side 7 in the present case, although an arrangement on the rear side 8 is also possible as an alternative or in addition.The pre-channel structures 35 fluidically connect the front side 7 with the recess 11, with the channel structure 10 and with the rear side 8.

[0136] The piston 2 of Fig. 5A-C is at least substantially cylindrical (“at least substantially” because the wipers 14 and the circumferential sealing groove 12 or seal 13 cause the outer contour to deviate from a cylindrical shape).

[0137] The piston 2 and the closure element 3 of Figs. 5A-C are parts manufactured by injection molding. The closure element 3 is made of a softer material (in particular a polymeric material) than the material of the piston 2 (in particular a polymeric material). In this case, the closure element 3 is made of a thermoplastic elastomer and the piston 2 is made of a polyethylene, although polypropylene (or another plastic) is also possible as an alternative or additional material. These or other polymers or plastics are suitable as materials for all parts mentioned in this application.

[0138] The cartridge piston assembly of Figs. 6A.1 to 6C is shown in the open position in Fig. 6A and in the closed position in Fig. 6B. The closure element 3 is inserted into the piston 2. In the open position, the head end 17 protrudes from the front of the piston, Figs. 6A.1 and 6A.2. The delivery-side rear end 8 of the piston 2 is shown in Figs. 6A.1 and 6A.2. The piston has openings 53 for venting in the support surface 51 for the rear end 49 of the head end of the closure element.

[0139] The head side of the closure element is designed as a cover 50. The cover has an end face designed as a seal 56 and a rear side 49, which is also designed to seal the openings 53 (see Fig. 6C), in that the rear side can close the support surface 51 for the rear side in a fluid-tight manner. The support surface 51 can be designed as a sealing surface 33. Due to the diameter of the head side of the closure element, it can be closed automatically by the application of force from the media, in that a drive shaft of a mixer conveys a medium on the conveying side. In the open position, the groove 52, which runs at least partially to completely around the head side, is fluidically permeable and the air can escape through the openings 53 and optionally the channel structure. In the closed position, the groove 52 is fluidically closed by the seal 56, Fig. 6B.1.The piston also has a sealing lip 55 running around its outer periphery. Fig. 6C shows a top view of the piston's support surface 51, which represents the openings 53 and the pre-channel structure 35, as well as a centering 54 toward the rear of the piston.

[0140] The cartridge piston assembly of Fig. 7A to 7E is shown in the open position in Fig. 7A and in the closed position in Fig. 7B. The closure element 3 is inserted into the piston 2. In the open position, the head side protrudes from the front of the piston, Fig. 7A. The delivery-side rear side 8 of the piston 2 is shown in Fig. 7A. The piston has the support surface 51, as shown in Fig. 7C, for the rear of the head side of the closure element. The closure element has a taper as a securing section 25 and a guide section 20. The sealing surface in the recess of the piston 33 is shown in Fig. 7A. The sealing surfaces 33 and the conical seal 24 abut one another in the closed position and seal the cartridge piston assembly in a fluid-tight manner. The head side 17 of the closure element 3 is designed as a cover 17B.Due to the diameter 17A of the head side of the closure element, this can be closed automatically by the application of force on the media side, in that a drive shaft of a mixer conveys a medium on the conveying side. In the open position, the groove 52, which runs at least partially to completely around the head side, is fluidically permeable and the air can escape along the closure element through the channel structure 10. In the closed position, the channel structure 10 is fluidically closed by the sealing element in the form of a conical seal 24, Fig. 7B. The piston also has a sealing lip 55 running around the outer circumference. The base side is shown as 62. Fig. 7C shows the piston in a plan view of the contact surface of the rear side 51, which represents the pre-channel structure 35 and a centering 54 in the direction of the rear side of the piston.

[0141] Figures 7D and 7E show the open and closed positions of the cartridge piston assembly comprising a piston 2 and a closure element 3 (7D open, 7E closed). Furthermore, the figures show air inlet elements or radial grooves 57 located on the outside of the piston around the head side of the closure element.

[0142] The channel structure (not shown) with pre-channel structure 35 (Fig. 7C) preferably runs radially from the recess in the direction of the outer circumference of the piston. Particularly preferably, the channel structure comprising a pre-channel structure runs radially from the recess at least partially outwards in the direction of the outer circumference of the piston, wherein the pre-channel structure is arranged in the support surface 51 of the piston. In the closed position, the support surface of the piston comes into contact with the rear side of the closure element; preferably, the rear side of the closure element rests on the support surface, preferably in a fluidly sealed manner. The cartridge piston device of Figs. 8A to 8C is shown in the open position in Fig. 8A and in the closed position in Fig. 8B. In the closed position, the head side of the closure element is substantially pushed into the piston. The closure element 3 is inserted into the piston.In the open position, the head side protrudes from the front of the piston, Fig. 8A.1, 8A.2. The delivery-side rear side 8 of the piston is shown in Fig. 8A. The piston has the support surface 51, as shown in Figure 8C, for the rear of the head side of the closure element. The closure element has a taper as a securing section 25 and a guide section 20. The sealing surface in the recess of the piston 33 is shown in Fig. 7A. In the closed position, the sealing surfaces 33 and the cylindrical seal 24 abut one another and seal the cartridge piston device in a fluid-tight manner. The head side 17 of the closure element is designed as a cover 17B. Due to the diameter 17A of the head side of the closure element, it can be closed automatically by the application of force on the media side, by a drive shaft of a mixer conveying a medium on the delivery side.In the open position, the groove 52, which runs at least partially to completely around the head side, is fluidically permeable and the air can escape along the closure element through the channel structure 10. In the closed position, the channel structure 10 is fluidically closed by the sealing element in the form of the cylindrical seal 24, Fig. 8B. The piston also has a sealing lip 55 running around the outer circumference. In Figs. 7B and 7C, the piston is shown in a plan view of the support surface of the rear side 51, which represents the pre-channel structure 35 and a centering 54 towards the rear side of the piston. Figures 8A.2 and 8B.2 show the open and closed positions of the cartridge piston device comprising a piston and a closure element 3 (8A.2 open, 8B.2 closed). The figures also show air inlet elements or radial grooves 57, which are located on the outside of the piston around the head side of the closure element.

[0143] Figures 9a to 9c show an alternative embodiment of a closure element 3 in a piston 2, in which the closure element 3 has an opening 61 on its head side. The opening 61 extends from the end face to the rear of the head side and is guided through the closure element to the opposite end of the closure element, in particular to the base side 62 of the closure element. On the rear side opposite the end face, the closure element has at least three elements 59; 4 to 6 or more elements are also possible, each of which has at least one sealing surface 60, preferably two sealing surfaces 60, formed from the outer circumference of the elements 59 to the opening 61. Due to the application of external force to the outer surfaces of the elements 59, the sealing surfaces 60 of two adjacent elements 59 come to rest on one another and close the opening 61 of the closure element on the side facing away from the end face.The opening in the closure element preferably lies on and / or parallel to the longitudinal center axis of the closure element. This embodiment corresponds to a closure element with conical gaps, which is formed by the elements with sealing surfaces.

[0144] List of reference symbols

[0145] 1 cartridge piston device

[0146] 2 pistons

[0147] 3 locking element

[0148] 4 cartridges

[0149] 5 Cartridge contents

[0150] 6 Inner surface (of the cartridge)

[0151] 7 Front (of the piston), cartridge side

[0152] 8 Rear side (of the piston), discharge side

[0153] 9 Outside (of the piston)

[0154] 10 Channel structure

[0155] 11 Recess

[0156] 12 Sealing groove

[0157] 13 Seal, O-ring

[0158] 14 scrapers

[0159] 15 Central axis (of the cartridge)

[0160] 16 Front face, cartridge or media side

[0161] 17 Header

[0162] 17A Diameter of the head side of the closure element 3

[0163] 17B Lid, in particular with diameter 17A of the head side 17 of the closure element

[0164] 18 Insertion direction

[0165] 19 Extension direction

[0166] 20 guide section

[0167] 21 Countersinking (of the recess)

[0168] 22 Central axis (of the closure element)

[0169] 23 Sealing auxiliary element, sealing lip

[0170] 24 Sealing element (of the closure element), cone

[0171] 25 Security section, tapering

[0172] 26 securing devices, snap ring

[0173] 27 Tapering, truncated cone, truncated cone section Radius (of the recess) Radius (of the channel structure) Radius (of the guide section) Diameter (of the guide section) Central axis (of the piston) Sealing surface (of the recess) Cavity Pre-channel structure Edge area (of the piston) A inner diameter Edge area, especially without edge recess B outer diameter Edge area Edge recess (of the piston), circumferential edge recess (of the piston) Depth (of the pre-channel structure) Depth (of the pre-channel structure) Width (of the pre-channel structure) Venting option, groove, slot Depth (of the venting option) Width (of the venting option) Gap Diameter (of the piston) Thickness (of the piston) Further sealing surface (at the countersink) Piston opening Rear side opposite the end face Cover Contact surface Rear side Groove Openings Centering Sealing lip(s) Auxiliary sealing element, seal,protruding sealing lip air inlet element or radial groove second guide section elements with at least two sealing surfaces (60) sealing surfaces opening of the closure element foot side,

Claims

Claims Cartridge piston device (1) for insertion into a cartridge (4) and for venting and closing the back of the cartridge (4), with a piston (2), and with a closure element (3) for insertion into the piston (2), wherein the piston (2) has - a front side (7), - a rear side (8) facing away from the front, - an outer side (9) with a circumferential sealing groove (12) and / or seal (13) for circumferential sealing on an inner surface (6) of the cartridge (2), characterized in that - the piston has a recess (11) in the region of the front side (7) for inserting the closure element (3) in an insertion direction (18), and - a channel structure (10) fluidically connecting the recess (11) and the rear side (8) for venting the cartridge (2), and - an insertion direction (18) pointing at least substantially from the front side (7) to the rear side (8) and a withdrawal direction (19) opposite the insertion direction (18), in particular for the closure element, wherein the closure element (3) insertable into the recess (11) or at least a part of the closure element (3) insertable into the recess (11) can be arranged so as to be adjustably guided in the insertion direction (18) from an open position fluidically releasing the channel structure (10) into a closed position fluidically closing the channel structure, wherein the closure element has a head side (17) with an end face (16) and a sealing element, wherein the closure element (3) can be fixed in the open position in the recess (11) to provide the open position and / or abuts at least in the withdrawal direction (19),and the piston has, in the direction of the front side, a support surface for the rear side (49) of the closure element, which support surface is formed substantially perpendicular to the central axis of the piston and is opposite the end face (16) of the closure element. A cartridge piston device according to claim 1, characterized in that, in the direction of the front side, the piston has, in a recess formed on the front side, a support surface for the rear side of the closure element, which support surface is formed substantially perpendicular to the central axis of the piston and is opposite the end face of the closure element. Cartridge piston device according to claim 1 or 2, characterized in that the closure element (3) has a head side (17) having an end face (16), and, preferably, wherein - at least in the open position, the end face (16) protrudes from the front side (7), and / or between the head side (17), in particular the rear side (49), and the piston (2), in particular a recess (21) of the piston, a gap (44) is formed fluidically opening into the recess (11), and / or - at least in the closed position, the end face (16) is at least substantially flush with the front face (7) or is recessed in the front face (7), in particular wherein the head face (17) is recessed further than in the open position. Cartridge piston device according to claim 3, characterized in that the head face (17) and / or the end face (16) is / are designed to be at least substantially round and / or corresponding to a, in particular and / or at least substantially cylindrical, recess (21) in the recess (11). Cartridge piston device according to one of claims 1 to 4, characterized in that the closure element (3) has a sealing element (24), in particular a cone (24), for sealing against a sealing surface (33) of the recess (11).Cartridge piston device according to one of claims 1 to 5, characterized in that the closure element (3) has an auxiliary sealing element (23), in particular a sealing lip (23), for contact with a further sealing surface (47) of the recess (21), preferably wherein the auxiliary sealing element (23) is arranged on the end face (16), on the head side (17) and / or circumferentially around the head side (17), end face (16) and / or the rear side (49). Cartridge piston device according to one of claims 1 to 6, characterized in that the closure element (3) has a securing section (25) for securing the closure element (3) relative to the piston (2), in particular by means of a securing means (26) of the piston (2), particularly preferably a snap ring (26) of the piston (2). Cartridge piston device according to one of claims 1 to 7, characterized in that the closure element (3) and / or the piston (2), in particular in the region of the recess (11) and / or along the insertion direction (18) or withdrawal direction (19), has a venting possibility (41), in particular comprising grooves or slots (41). Cartridge piston device according to one of claims 1 to 8, characterized in that the piston (2) has a pre-channel structure (35) on the front side (7) and / or on the rear side (8), preferably wherein the pre-channel structure (35): - fluidically connects the front side (7) to the recess (11), the channel structure (10) and / or the rear side (8), and / or - fluidically connects the rear side (8) to the channel structure (10) and / or the recess (11). Cartridge piston device according to claim 9, characterized in that the pre-channel structure (35), in particular on the piston (2), has recesses that are open to the outside and / or toward the cartridge (4) and / or are groove-shaped, preferably wherein the recesses are arranged on or within the front side (7) and / or the rear side (8), at least approximately, over the entire surface and / or in a distributed manner.Cartridge piston device according to claim 9 or 10, characterized in that the pre-channel structure (35) on the piston (2) has open and / or groove-shaped depressions towards the outside and / or towards the cartridge (4), wherein the depressions run within the front side (7) from the center of the front side (7), in particular from the recess (11) and / or from the countersink (21) to the edge region (36), and in particular open in the edge region, preferably open in an edge depression (37) running around the front side (7) in the edge region, particularly preferably the depressions run radially, preferably spoke-shaped or star-shaped.Cartridge piston device according to one of claims 1 to 11, characterized in that the ratio of the diameter of the head side of the closure element (3) to the diameter of the piston (2), in particular the diameter of the front side (7) of the piston, more preferably the inner diameter (36A) of the edge region (36) of the piston is from 1:2 to 1:

10. Preferably from 1:3 to 1:7, particularly preferably 1:5, in particular with plus / minus 25%, in particular plus / minus 10%, preferably plus / minus 5%. Cartridge piston device according to one of claims 1 to 12, characterized in that the closure element (3) and / or the piston (2) is made of and / or comprises one or more of: thermoplastic, elastomer, thermoset, polypropylene (PP), polyethylene (PE), and / or a thermoplastic elastomer (TPE). Method for venting and closing a cartridge (4) with a cartridge piston device (1), the cartridge piston device (1) - comprising a piston (2) having a channel structure (10) and a closure element (3) for closing the channel structure (10) by inserting the closure element (3) into a recess (11) of the piston (2) in the region of the front side and by adjusting the closure element (3) into a closed position, or - designed according to the preamble of claim 1 or according to one of the preceding claims, wherein the method is characterized by the following method steps a. providing a cartridge, in particular a cartridge (4) filled with cartridge contents, with a piston opening (48), b. providing the cartridge piston device (1), in particular with the closure element (3) inserted into the recess (11) and / or in an open position, c. inserting the cartridge piston device (1) into the piston opening (48), wherein an open position is present, d. venting the cartridge (4) by pushing in the cartridge piston device, wherein the closure element (3) is held fixed by the recess (11) and / or is or can be struck in the pull-out direction (19), and, preferably, e.Closing the cartridge (4) by adjusting the closure element (3) into the closed position by contact of the cartridge contents (5) with the closure element (3) and / or by introducing force onto the closure element (3), preferably during or after step d. Closure element (3) for use with a piston (2), wherein in particular a piston with inserted closure element (3) forms a cartridge piston device (1). wherein the closure element (3) has a head side (17) with an end face (16) and with a rear side which is opposite the end face (16), and a sealing element.Closure element according to claim 15, characterized in that the closure element has an opening on its end face (16) of the head side (17), which opening extends from the end face to the back of the head side and is optionally guided through the closure element to the opposite end of the closure element, in particular to the foot side (62), wherein in particular the opening on the back of the closure element opposite the end face has at least three elements (59), which each have at least two sealing surfaces (60) which are formed from the outer circumference of the elements to the opening (61), and through the application of external force to the outer surfaces of the elements, the sealing surfaces of the elements come to rest on one another and thereby close the opening (61) on the side of the closure element facing away from the end face.Piston (2) for insertion into a cartridge, characterized in that it has a front side (7), a rear side (8) facing away from the front side, an outer side (9) with a circumferential sealing groove (12) and / or seal (13) for circumferential sealing on an inner surface (6) of the cartridge (4), with a recess (11) in the region of the front side (7) for inserting a closure element (3) in an insertion direction (18), and optionally a channel structure (10) fluidically connecting the recess (11) and the rear side (8) for venting the cartridge (4), and the piston (2) has, in the direction of the front side, a support surface for the rear side of the closure element, which support surface is formed substantially perpendicular to the central axis of the piston and lies opposite the end face of the closure element. Kit comprising at least one cartridge piston device according to one of claims 1 to 13 and a cartridge, in particular a single-chamber or double-chamber cartridge.Use of a cartridge piston device (1) for insertion into a cartridge and closing the back of the cartridge (4), wherein the cartridge piston device (1) comprises. - a piston (2) having a channel structure (10) and a closure element (3) for closing the channel structure (10) by inserting the closure element (3) into a recess (11) of the piston (2) and by adjusting the closure element (3) into a closed position, or - designed according to the preamble of claim 1 or according to one of the preceding claims; characterized in that the closing of the cartridge (4) involves adjusting the closure element (3) into the closed position, which is brought about by contact of one or more of the cartridge contents (5) with the closure element (3) and / or by applying force to the closure element (3).

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