DE202014102561U1 - Pressure cup for a spray gun, adapter for attaching such a pressure cup to a spray gun and spray gun with such a pressure cup - Google Patents

Abstract

Pressure cup (1) for a spray gun, comprising at least one cup neck (2), a cup body (3) and a base area (4), characterized in that the diameter of the cup body (3) is in an upper section (31) along a cup neck axis changes nonlinearly at least in some areas and that the bottom area (4) has at least one area (43) which is curved outwards.

Description

The present invention relates to a pressure cup for a spray gun according to the preamble of claim 1, an adapter for mounting a pressure cup on a spray gun according to the preamble of claim 28 and a spray gun according to the preamble of claim 32.

In order to protect cavities, for example of chassis or bodies, but also the underbody of motor vehicles from corrosion, rust inhibitors are applied to the surfaces in question. Preferably, the material to be applied, e.g. Cavity preservatives, oils, wax or greases, applied by pneumatic atomization. By this method, a rapid and uniform application of the material on the surface or in the cavity is possible.

Since the materials mentioned are usually highly viscous, sufficient atomization by means of the known flow or suction cup spray guns is not possible. When using a flow cup gun, i. In addition, due to the high viscosity of the material, a sufficient flow of material would not be achieved by means of a spray gun with paint cup attached to the top, in which the material to be sprayed is supplied to the gun by means of gravity. Furthermore, the injection pressure prevailing in conventional flow cup guns would not cause sufficiently fine atomization. The same applies when using suction cup guns, in which the paint cup is attached to the underside of the spray gun, and in which the material to be sprayed the gun is supplied by negative pressure of the atomizer nozzle.

For these reasons, special high pressure spray guns are used for cavity sealing and similar work. In this type of guns, the compressed air from the spray gun is directed into the pressure cup connected to the bottom of the gun. The cup is thereby subjected to a pressure of up to 10 bar. Because of this pressure, the medium to be sprayed in the cup is pressed into the material channel of the spray gun via a riser pipe, which is connected to the material channel in the interior of the spray gun and protrudes into the interior of the cup. In order to adapt the spray gun to different types of coating surfaces, in particular to differently shaped cavities, the spray gun can often be equipped with different probes, which can be attached to the front end of the spray gun. Depending on the intended use, these probes can be shaped differently, consist of flexible and rigid sections and have different oriented material outlets.

The material to be sprayed flows from the material duct of the spray gun into a mixing cap where the material is mixed with compressed air flowing from an air inlet of the gun via air passages into the mixing cap. The resulting aerosol is directed to the probe outlet, where it is released and applied to the surface to be coated.

Since the cup for the material to be sprayed must withstand high pressure, these cups are made according to the prior art of metal, especially aluminum. Such aluminum cups of conventional design must have a relatively large wall thickness, which increases the material requirements and thus the cost of the cup and its weight. In addition, there may be chemical reactions between the aluminum of the cup and some spray media, which adversely affects the consistency of the cup and the quality of the medium. By the standard cylindrical shape of the cup corners are formed, which deteriorates the cleanability of the cup. Furthermore, aluminum cups are usually made by deep drawing and pressing, which requires reworking of the cups. Moreover, the optical design of the cup, in particular the choice of color, hardly variable in a production of aluminum. If the cup is to have a different color, a logo or a pattern, these features must be applied separately after the actual production process.

Object of the present invention is therefore to provide a pressure cup for a spray gun, which is characterized by high pressure resistance, low weight, simple and inexpensive production, chemical resistance and good cleanability and is more flexible in terms of its optical design.

A further object of the present invention is to provide an adapter by means of which the attachment of a pressure cup with the above-mentioned properties to a spray gun is possible.

Another object of the present invention is to provide a spray gun with a pressure cup having the above-mentioned characteristics.

The first object is achieved by a pressure cup with the features of claim 1. The second object is achieved by an adapter with the features of claim 28. The third object is achieved by a spray gun with the features of claim 32. Advantageous embodiments are the subject of the dependent claims.

The pressure cup according to the invention has at least one cup neck, a cup body and a bottom region, wherein the diameter of the cup body changes at least partially non-linearly in an upper section along a cup neck axis and the bottom region has at least one outwardly curved region. The cup is thus not cylindrical, but the bottom is at least partially, preferably completely, rounded. Likewise, the edges of the cup in the upper area below the cup neck are at least partially rounded.

The distance of the cup wall to the cup neck axis is not constant in this upper portion of the cup body along this cup axis and not linearly increasing or decreasing, but the cup wall is a curve with respect to the Cup neck axis and along the Cup neck axis. The cup neck axis is the axis that passes centrally through the cup neck. The cup bottom is at least partially, preferably completely convex. Also, the upper portion of the cup body can be regarded as arched outwards.

The upper portion of the cup body is the cup neck facing the part of the cup body. The upper portion, in which the diameter of the cup body along a cup axis at least partially changes non-linearly does not have to be directly at the upper end of the cup body, i. be formed directly below the cup neck. The cup neck and said upper portion may rather be separated by inwardly curved and / or flat areas. Due to the aforementioned curves or vaults, a very good pressure distribution can be ensured. The stresses caused by the internal pressure in the cup can be dissipated via radii. Due to the inventive design of the cup can withstand a higher pressure compared to a cylindrical cup according to the prior art with the same wall thickness. Optionally, with the same pressure resistance, a smaller wall thickness and thus a lower material use with resulting weight savings, and lower material costs can be achieved.

Preferably, the diameter of the cup body along the cup neck axis increases in the direction of the bottom region at least partially. This means that the cup from the cup neck in the direction of the cup bottom at least partially continues. This expansion can increase the volume of the cup and therefore the amount of absorbable material. Particularly preferably, the diameter of the cup body in the direction of the bottom region in the vicinity of the cup neck increases to a relatively high degree, wherein the increase of the diameter decreases in the direction of the bottom portion.

Preferably, the cup neck axis is equal to the cup longitudinal axis. Particularly preferably, the cup is rotationally symmetrical with respect to the cup neck axis and / or the cup longitudinal axis. The connection means, e.g. a thread on the cup neck and manufacturing-related features, such as injection points, sprues, welds or closure points, lines or lips, or other additional features may differ from the rotational symmetry.

Preferably, the pressure cup according to the invention consists of plastic, in particular polyethylene or a polyethylene mixture or alloy. It particularly preferably consists of HDPE. As a result, the cup has a higher chemical resistance than an aluminum cup. The plastic is not or not as much attacked by reactive media as aluminum, which makes the plastic cup for a long time storable and transportable. Due to the lower density of most plastics compared to aluminum, the plastic cup has a lower weight. Due to the inventive design of the cup still has a high mechanical stability. Furthermore, a cup made of plastic is easier, faster and cheaper to produce than aluminum cup according to the prior art. For example, the cup according to the invention can be produced by means of injection molding or tubular blowing. Compared to aluminum cups, plastic cups offer more options in terms of optical design. For example, the color of the cup can be influenced by the choice of plastic with the desired color. Logos or other markings can be introduced more easily into the cup surface than would be possible with aluminum forming processes. The corresponding number plate only has to be inserted into the injection molding or tubular blow mold. The attachment of scales or labels can be integrated directly into the manufacturing process, for example, such additional elements can be molded directly, or they can be part of the surface structure by appropriate design of the tool. Another advantage of plastic over aluminum is the lower material price. In addition to the use of HDPE, the use of other, in particular thermoplastic, plastics is conceivable, as is the use of fiber-reinforced plastics.

Particularly preferably, the convex portion of the cup bottom extends substantially over its entire lower course. This means that the soil, preferably both the inner and the outer surface of the soil, has no flat area, in particular no horizontal flat area. This gives a further optimized pressure distribution at the bottom of the cup. If the bottom had a flat area, there would be stress peaks in the cup under pressure, which could lead to deformation and, in the worst case, bursting of the cup. This could cause serious injury to the user. Manufacturing-related features, such as, for example, injection points, sprues, welds or closure points, lines or lips, or other additional features may be present. At sufficiently low pressures, however, a flattening, in particular a horizontal flattening in the middle of the bottom, can be provided in order to ensure an independent state of the cup can.

Preferably, the radius of the outwardly arched region is substantially constant over the entire lower course of the bottom region. The entire lower portion of the bottom thus has the shape of a spherical cap. Alternatively, the lower portion of the bottom may be composed of different radii and / or circle segments having different centers. In particular, the lower region of the bottom along a first direction may follow the course of one or more circle segments and along a second direction, which may be, for example, perpendicular to the first direction, the course of one or more further circle segments. The circle segments can have different radii. In particular, the floor may have the shape of a part of an ellipsoid. However, the lower part of the floor can also be composed of different free-form surfaces.

In a preferred embodiment of the present invention, the bottom portion has at least one cylindrical portion. This can be formed in particular between the lower region of the bottom and the cup body. The transition between the lower portion and the cylindrical portion of the bottom may be rounded or bevelled. Such a cylindrical region can serve to receive and / or support a stand ring described below. The extent of the cylindrical area in the direction of the cup longitudinal axis and / or the cup neck axis is preferably smaller than the extent of the lower area of the floor.

Preferably, the outer diameter of the bottom portion of the cup at its largest point is smaller than the outer diameter of the cup body at its largest position. In particular, the above-mentioned cylindrical portion of the bottom may have a smaller outer diameter than the portion of the cup body located above it. The two parts can be separated by a depression. If the difference between the outer diameters is equal to twice the wall thickness of a stationary ring described below, an almost step-free and edge-free transition between the stationary ring and the cup body is provided.

Preferably, the bottom region and the cup body are at least partially separated from one another via a depression, in particular a groove. This may preferably be configured circumferentially and have a rectangular, part-circular or trapezoidal cross-section. Particularly preferably, two sides of the groove form an angle of approximately 90 ° with one another, while two other sides form a larger angle, in particular an angle of approximately 120 °. One side of the groove may be shorter than another side. However, the depression can also be configured differently. Such a groove or recess can serve to receive a lower ring described below.

Preferably, the cup wall in the upper section along the cup neck axis at least partially follows a curve with at least two different radii. Here, the radius of the cup cross section, i. of the circle around the cup longitudinal axis. Rather, the cup wall follows in longitudinal section of the cup a curve composed of at least two different radii, i. the cup wall is arched to different degrees. For example, the upper part of the curvature may have a smaller radius than the lower part. The cup wall can be curved both inwards and outwards. The parts can flow smoothly into each other. A composition of areas with three or more different radii is conceivable. As a result, a further optimization of the stress distribution can be possible.

In a preferred embodiment of the pressure cup according to the invention, at least one radius of the upper portion of the cup body and a radius of the outwardly curved portion of the cup bottom are between 50 mm and 100 mm, in particular between 73 mm and 80 mm. Another radius of the upper portion of the cup body is preferably between 25 mm and 35 mm.

Preferably, the wall thickness of the cup body is at least partially between 2 mm and 6 mm and the wall thickness of the bottom portion at least partially between 3 mm and 6 mm. This wall thickness is sufficient in inventive design of the cup, so that the cup can withstand a pressure of at least 10 bar. The bottom area comprises the lower arched area, the cylindrical area and at least part of the above-mentioned depression between the bottom region and the cup body.

Particularly preferably, the cup has at least one stiffening rib. This may or may be located, for example, on the floor, in particular at the lower area of the floor and / or on the cup body. Particularly preferred is a plurality, for example, ten to 14 stiffening ribs distributed over the circumference of the cup body at the height of the arched upper portion of the cup body. The stiffening ribs are preferably arranged on the outside of the cup, but may also be formed on the inside. They can be designed as embossing inwards or outwards, or as attached webs.

Preferably, the cup neck has at least one connecting means for connecting the pressure cup to a spray gun or an adapter. Particularly preferably, the at least one connecting means at least partially a thread, in particular an interrupted by at least one section external thread. Such a broken external thread is easy to manufacture with the known forming process, in particular for plastic, for example injection molding and blow molding, since the thread is free of undercuts. At the same time it is possible to design the thread despite the interruption so that it can be easily connected to a mating thread, even with a continuous mating thread. Preferably, the thread is a saw thread, in which a flank, in particular the flank, is substantially perpendicular to the cup neck. The second flank forms with the cup neck an angle of more than 90 °, in particular 120 °. However, other types of threads, in particular trapezoidal thread or metric thread can be used. The thread can be cut off along two mutually parallel imaginary planes that are parallel to the cup longitudinal axis. For example, these planes may be tangent to the outside or inside of the cup neck, or through the wall or inside of the cup neck. Through such sections of the external thread arise two opposing thread segments. Of course, however, the thread may be continuous, or truncated along three or more imaginary planes. In a section along three imaginary planes they are preferably at an angle of 60 ° to each other. In such a case, there are three thread segments. Particularly preferably, the thread is a coarse thread with a pitch of 4 mm to 6 mm. Such a coarse thread is, in particular by conventional plastic forming easier to produce than a fine thread. Furthermore, fewer turns are needed to screw the cup to the spray gun or adapter.

As an alternative or in addition to the thread, the cup neck as connection means can also comprise a bayonet connection, a latching mechanism, a plug-in mechanism, a sliding mechanism and / or some other device which is suitable for connecting the pressure cup to a spray gun or an adapter or the connection means itself be designed as such device.

In a preferred embodiment of the pressure cup according to the invention, this has a closure element for closing at least one cup opening. Such a cup opening may, for example, be the upper opening of the cup neck. Particularly preferably, the closure element is a lid, a stopper, a sealing foil or a screw cap. However, a cork or a crown cap can serve as a closure element. Such a closure element makes it possible to fill the pressure cup with a spiky medium, to seal and filled to transport and / or sell. Particularly suitable for this purpose is a single-use closure element, such as e.g. a sealing foil. This can be removed before attaching the cup, or it is pierced when connecting the cup to a spray gun with the riser of the spray gun. If the medium in the pressure cup is not completely used up, then in both cases another closure element, in particular a screw cap, can be provided, through which the cup can be closed in order to prevent the medium in the cup from drying out. Conveniently, the above-mentioned connecting means for connecting the pressure cup to a spray gun or an adapter is used to close the cup. Thus, e.g. an external thread on the cup neck serve both for connection to a spray gun or an adapter, as well as a counter-element for a screw cap with internal thread. However, it can also be used as a closure element, a self-closing membrane used, which can be pierced by the riser of the spray gun, and after pulling out of the riser, the resulting opening closes again by itself.

Particularly preferably, the pressure cup for receiving a holding means is configured or has such a holding means. This holding means may in particular have the purpose of holding the pressure cup in an upright position. The holding means is advantageous for the pressure cup according to the invention, since due to the curved cup bottom no secure state of the cup is ensured. The Holding means may comprise the circumference of the pressure cup and protrude down over the bottom. The holding means may for example be in the form of a stand ring and at least approximately and / or partially have the shape of a hollow cylinder or a hollow truncated cone. However, the holding means may also have a different shape, in particular it may have a square cross-section and / or be made of a non-hollow solid part. The holding means may be made of plastic and / or metal. It can be designed such that it has a particularly high weight, whereby it provides the mug a safer stand. Before use, the retainer can be removed from the cup to reduce the weight hanging on the gun. Alternatively, the holding means may be configured as a framework.

Advantageously, the holding means by means of locking, screw, plug, press, bayonet, rivet or adhesive connection is attached or attachable to the cup. For example, the holding means on its inside, in particular at the upper end, have a projection whose shape corresponds at least approximately with a depression in the pressure cup. Both the projection on the base ring and the recess in the cup are preferably configured circumferentially. Particularly preferably, the depression in the cup is the above-mentioned depression which separates the bottom region and the cup body from one another. However, the holding means can also be attached to the cup by means of other detachable or non-detachable connections.

The holding means advantageously has, at least in some areas, a coating, in particular an anti-slip coating. This is preferably designed as a rubber coating on the underside of the holding means and reduces or prevents the sliding of the cup with attached holding means on the stand surface. However, the anti-slip coating can also be arranged in the contact area between the holding means and the pressure cup in order to reduce the movement between the holding means and the cup. Further, the anti-slip coating may be disposed on the outer surface of the retaining means to facilitate removal of the base ring from the cup by the user. The anti-slip coating may also be applied to the outer surface of the pressure cup according to the invention to improve its grip and to prevent the cup from slipping out of the hand of the user.

Particularly preferably, the pressure cup according to the invention has an adapter for attaching the cup to a spray gun. By means of such an adapter, it is possible, pressure cup according to the invention with different connecting means, i. Connections to attach to a spray gun. Frequently known high-pressure spray guns, in particular cavity preserving guns, have a cup connection with an inner diameter of about 35 mm to 45 mm and a fine thread with a pitch of about 1 mm to 3 mm. Matching external threads are to be realized with the preferred method for the production of the cup according to the invention method only with increased effort, while other connection means, in particular the preferred segmented coarse thread, are easier to produce. The adapter, however, can be configured as a rotationally symmetric element and thus as a rotating part, whereby the introduction of a fine thread is possible without problems. The adapter may for example be made of plastic, in particular hard plastic, or of metal, in particular of aluminum. The adapter may also be an injection molded part or otherwise manufactured. At at least one end, the adapter has a region corresponding to the cup connection of the spray gun, in particular an external fine thread. At at least one other end, the adapter has a region corresponding to the connecting means on the pressure cup, in particular an internal coarse thread. However, the adapter may also have other connection means, e.g. at least one bayonet, latching, sliding or plug connection or an alternative screw mechanism.

The adapter according to the invention is characterized in that it is designed for attaching an above-mentioned pressure cup to a spray gun, in particular to a cavity preserving gun. The above-mentioned features concerning an adapter can also be used in the adapter according to the invention. In particular, it may have at least one internal thread and one external thread, wherein the internal thread is preferably a coarse thread with a pitch of 4 mm to 6 mm and the external thread is a fine thread with a pitch of 1 mm to 3 mm.

Furthermore, the adapter can have at least one sealing element. This can be arranged, for example, in the area of contact between pressure cup and adapter and / or in the area of contact between adapter and spray gun. Thereby, an unwanted escape of compressed air and / or the spray medium can be prevented at the transition areas. The sealing element may be configured as a sealing ring, as a lip or in some other way. It can be inserted into a groove or pressed or molded on a surface, glued or attached in some other way detachable or non-detachable. Alternatively or additionally, a sealing means may be provided on the pressure cup and / or on the spray gun, advantageously also in areas of contact between different components. Thus, for example, a sealant may be arranged on the cup neck, in particular on its upper edge. That's the gun Sealant preferably mounted in the area of the cup connection. Above mentioned forms of the sealant can also find application here.

The spray gun according to the invention, in particular pressure cup gun for spraying highly viscous material, is characterized in that it has a pressure cup mentioned above or can accommodate such a pressure cup and operated with it. The recording can be done either directly or by means of an adapter, in particular by means of an adapter described above. Particularly preferably, the spray gun according to the invention such an adapter or such an adapter can be attached to the spray gun.

A preferred embodiment of the spray gun according to the invention has at least one riser, a pressure relief valve and a one-way valve, in particular a check valve on. Furthermore, the spray gun according to the invention may have a device for connecting probes to the spray gun. Particularly preferably, the device for connecting probes is designed as a quick coupling. This allows quick attachment and removal and thus a quick change of probes.

Hereinafter, an embodiment of the pressure cup according to the invention, the adapter according to the invention and the spray gun according to the invention will be explained in more detail with reference to 6 drawings. Showing:

1 a side view of an embodiment of the pressure cup according to the invention,

2 a perspective view of an embodiment of a holding means for a pressure cup in the form of a stand,

3 a perspective view of an embodiment of the spray gun according to the invention without pressure cup,

4 a perspective view of an embodiment of the adapter according to the invention,

5 a perspective view of the embodiment of the pressure cup according to the invention from 1 , of the embodiment of the holding means 2 and the embodiment of the adapter according to the invention 4 in assembled condition,

6 a perspective view of the components 5 with the embodiment of the spray gun according to the invention 4 ,

1 shows an embodiment of a pressure cup according to the invention 1 with a cup neck 2 , a cup body 3 and a floor area 4 , In his upper section 31 the diameter of the cup body changes along a cup axis at least partially non-linear, the pressure cup 1 here has a first outwardly arched area. The floor area 4 has a second outwardly arched area 43 on. At the in 1 illustrated pressure cup 1 is the arched area in the upper section 31 of the pressure cup 1 directly below the cup neck 2 educated. Only a short concave section separates the two areas. However, this concave area can also be made longer or shorter and with a smaller or larger radius. Also, the cup neck 3 and the arched upper section 31 be separated by a kink or by a different shaped area. Also, the cup neck may be shaped differently, in particular it may be longer or shorter than in 1 shown. The arched upper section 31 of in 1 shown embodiment of the cup according to the invention 1 is made of two differently curved areas with different radii R1 and R2. Towards the cup bottom follows the arched upper section 31 a straight section 33 whose diameter increases towards the bottom. In the transition area between the arched upper section 31 and the straight section 33 are several reinforcing or stiffening ribs 32 arranged. These are advantageously uniform over the circumference of the cup 1 distributed and arranged at the same height. Ribs 32 can be configured as a thickening of the cup wall or as imprints in the cup wall. Ribs 32 can be designed inwardly, outwardly as well as in both directions simultaneously protruding or mixed. They may have the shape of flat pins which are raised at their upper end from the adjacent surface and at their lower end in the outer surface of the cup body 3 pass. However, they can also be shaped differently or in a different location of the cup 1 be arranged.

The straight section 33 of the mug 1 is terminated by a step that goes into a recess 41 that leads into 1 is designed as a circumferential groove. In this depression 41 can be a head start 56 one in 2 shown stand ring 5 snap into place and the stand ring 5 so with the cup 1 connect. The bottom of the depression 41 in the Cup 1 is preferably parallel to the cup longitudinal axis, the upper wall of the recess 41 is preferably perpendicular to this. The under wall of the depression 41 forms with the bottom of the depression 41 preferably an angle of more than 90 °, in particular an angle of about 120 °. This can be the lead 56 of the stand ring 5 easier from the depression 41 come out and the Standring 5 lighter from the mug 1 subtracted from. The depression 41 However, it may also have a different shape, arranged at a different position of the cup and / or not be circumferential. The depression 41 follows another straight, especially cylindrical section 42 , the floor area 4 of the mug 1 can be assigned. The diameter of this section 42 in the present embodiment is smaller than the diameter of the cup body 3 above the depression 41 , This makes it possible for the cup 1 and the stand ring 5 in such a way that their outer surfaces merge into each other nearly infinitely. The cylindrical section 42 may serve a holding agent on the cup 1 to stabilize and prevent wobbling of the holding means. The floor area 4 of the mug 1 has, preferably on its underside, a second outwardly arched area 43 , This is at the in 1 shown embodiment of the cup over the entire bottom equally curved. 1 shows in the middle of the vault 43 a rib 45 that may be due to the manufacturing process or may be a stiffening rib.

2 shows a holding means, in particular a stand ring 5 for a pressure cup according to the invention, in particular for the in 1 shown embodiment of the cup 1 , The stand ring 5 has substantially the shape of a hollow truncated cone, ie, a downwardly expanding hollow cylinder, and has an already mentioned projection 56 for attaching the stand ring 5 on the pressure cup 1 on. The inner surface of the projection 56 is preferably parallel to the longitudinal axis of the base ring 5 and perpendicular to the top edge. The sides of the projection 56 are advantageously at least partially bevelled to the attachment and removal of the base ring 5 on or from the cup 1 to facilitate. The inner diameter of the base ring 5 in the area of the projection 56 is slightly smaller than the outside diameter of the cup 1 in the area below the depression 41 , This will make the stand ring 5 when pressing it on the cup 1 slightly deformed. The lead 56 can in the depression 41 in the Cup 1 snap in and can only be released from it with a certain amount of effort. Both the lead 56 as well as the depression 41 can also be designed differently. In particular, they may have a different shape and / or not be circumferential. Also, the depression can 41 circumferential, the projection, however, be present only in segments. Also, the holding means, in particular the stand ring 5 , a depression and the cup 1 have one or more projections. The in 2 shown stand ring 5 has a coating 54 , in particular a rubber anti-slip coating. The stand ring 5 also has stiffeners 52 which also improves the grip of the foot ring 5 can serve to make it easier from the mug 1 to be able to solve. The stand ring 5 can also have horizontal projections or ribbing for this purpose. For attachment to a pressure cup, the base ring 5 also have a thread, advantageously an internal thread, by means of which the stand ring 5 to a thread corresponding to this thread, in particular external thread, on the cup 1 can be screwed.

3 shows a spray gun according to the invention 6 without pressure cup. The spray gun 6 in particular has an upper gun body 6a , a grip area 6b , a hanging hook 61 , a trigger guard 62 and a cup connection 63 with internal thread and a sealing surface 63a on. At the bottom of the grip area 6b is a compressed air connection 66 arranged, from which a part of the compressed air via compressed air holes in the interior of the gun body in a mixing chamber 64a is directed. Another part of the compressed air, also via compressed air holes in the gun body, to a one-way valve, in particular a check valve 65 directed, from which the compressed air in the at the gun 6 connected pressure cup flows and this is pressurized. Due to this pressure, the medium in the cup is via a riser 67 also in the mixing chamber 64a pressed. There we mix the medium with the compressed air. Downstream of the mixing chamber 64a is a configured in the present embodiment as a quick coupling device 64b for connecting probes to the gun 6 arranged. Depending on the purpose of the pistol 6 There may be different probes or nozzles, such as a door probe, a nylon probe, a hook probe, a Venturi hook probe or a broad-jet nozzle can be attached. The gun 6 Also has means for closing compressed air holes, which in the present embodiment as a ball 68 and screw 69 are formed. However, the gun may also be designed differently and still be suitable for use with a pressure cup according to the invention. In particular, the one-way valve may be a duckbill valve or the like instead of a check valve.

4 shows an embodiment of an adapter according to the invention for mounting the pressure cup 1 out 1 at the spray gun 6 out 3 , The in 4 shown adapter 8th consists essentially of a hollow cylindrical part whose outer surface at least partially with an external thread 81 is provided, and a hollow truncated cone or also hollow cylindrical part with a larger diameter, the at least partially an internal thread 83 having. The two parts are separated by a step, wherein at least one surface of the step, in particular the inner surface of the step, preferably is substantially perpendicular to the adapter longitudinal axis. This inner surface preferably has a circumferential groove in which a sealing element, in particular a sealing ring 85 can be arranged. This sealing ring 85 prevents air from the cup from undesirably leaking beyond the contact area between the adapter and the cup, thereby causing a pressure drop in the cup. Alternatively or additionally, the outer surface of the step can be provided on the adapter with a groove and a sealing element, in particular a sealing ring. In this case, a better seal of the contact area between adapters 8th and pistol 6 be guaranteed. The adapter 8th can have any shape which allows to connect the pressure cup according to the invention to a spray gun. Instead of threads, other connecting means come into question.

5 shows an assembly consisting of cups 1 , Adapter 8th and stand ring 4 in particular the upper portion of the adapter 8th is more apparent than in 4 ,

6 shows the assembly 5 mounted on the spray gun 6 out 3 , In the present drawing, in particular, a further closure means for a compressed air bore in the form of a screw 70 and a pressure relief valve 72 at the spray gun 6 recognizable. The pressure relief valve 72 is through a through hole in the gun body with the inside of the cup 1 connected. Once a certain pressure in the cup 1 are reached, for example, 10 bar, opens the valve. This ensures that the pressure in the cup does not rise above a critical level, which could damage the cup. The pressure relief valve 72 can be configured such that the response pressure is adjustable. The manufacturer of the spray gun and / or the cup can thereby set the permissible pressure for his product. Thereafter, the adjustment mechanism of the valve may be disabled, for example, sealed, to prevent the allowable maximum pressure from being changed by third parties. Alternatively, the pressure relief valve can be designed such that the user can set the set pressure and thus the pressure prevailing in the cup itself. Advantageously, the valve is designed in this case such that the adjustment is possible only within a certain scope.

It should finally be noted that the described embodiments describe only a limited selection of possible embodiments and thus represent no limitation of the present invention.

Claims (36)

Pressure cup ( 1 ) for a spray gun, comprising at least one cup neck ( 2 ), a cup body ( 3 ) and a floor area ( 4 ), characterized in that the diameter of the cup body ( 3 ) in an upper section ( 31 ) along a cup axis at least partially non-linearly changes and that the bottom area ( 4 ) at least one outwardly curved region ( 43 ) having. Pressure cup ( 1 ) according to claim 1, characterized in that the diameter of the cup body ( 3 ) along the cup neck axis toward the bottom area ( 4 ) at least partially enlarged. Pressure cup ( 1 ) according to one of the preceding claims, characterized in that the cup neck axis is equal to the cup longitudinal axis. Pressure cup ( 1 ) according to one of the preceding claims, characterized in that it is rotationally symmetrical with respect to the cup neck axis and / or the cup longitudinal axis. Pressure cup ( 1 ) according to one of the preceding claims, characterized in that it consists of plastic, in particular polyethylene or a polyethylene mixture or alloy. Pressure cup ( 1 ) according to one of the preceding claims, characterized in that the outwardly arched area ( 43 ) substantially over the entire lower course of the floor area ( 4 ) runs. Pressure cup ( 1 ) according to one of the preceding claims, characterized in that the radius (R3) of the outwardly curved region (R3) 43 ) substantially over the entire lower course of the floor area ( 4 ) is constant. Pressure cup ( 1 ) according to one of the preceding claims, characterized in that the floor area ( 4 ) at least one cylindrical region ( 42 ) having. Pressure cup ( 1 ) according to one of the preceding claims, characterized in that the outer diameter of the bottom region ( 4 ) is smaller at its largest point than the outer diameter of the cup body ( 3 ) in its largest place. Pressure cup ( 1 ) according to one of the preceding claims, characterized in that the floor area ( 4 ) and the cup body ( 3 ) at least in some areas via a depression ( 41 ) are separated from each other. Pressure cup ( 1 ) according to claim 10, characterized in that the recess ( 41 ) is circumferential. Pressure cup ( 1 ) according to one of the preceding claims, characterized in that the cup wall in the upper section ( 31 ) along the cup neck axis at least partially follows a curve with at least two different radii (R1, R2). Pressure cup ( 1 ) according to one of the preceding claims, characterized in that at least one radius (R1, R2) of the upper section ( 31 ) and a radius (R3) of the arched area ( 43 ) of the cup soil ( 4 ) between 50 mm and 100 mm, in particular between 73 mm and 80 mm. Pressure cup ( 1 ) according to one of the preceding claims, characterized in that at least one radius (R1, R2) of the upper section ( 31 ) is between 25 mm and 35 mm. Pressure cup ( 1 ) according to one of the preceding claims, characterized in that the wall thickness of the cup body ( 3 ) at least partially between 2 mm and 6 mm and the wall thickness of the bottom area ( 4 ) is at least partially between 3 mm and 6 mm. Pressure cup ( 1 ) according to one of the preceding claims, characterized in that it comprises at least one stiffening rib ( 32 ) having. Pressure cup ( 1 ) according to one of the preceding claims, characterized in that the cup neck ( 2 ) at least one connecting means for connecting the pressure cup ( 1 ) to a spray gun ( 6 ) or an adapter ( 8th ) having. Pressure cup ( 1 ) according to claim 17, characterized in that the at least one connecting means at least partially a thread, in particular by at least one section ( 22 ) interrupted external thread ( 21 ). Pressure cup ( 1 ) according to claim 18, characterized in that the thread ( 21 ) is a coarse thread with a pitch of 4 mm to 6 mm. Pressure cup ( 1 ) according to one of claims 17 to 19, characterized in that the connecting means comprises a bayonet connection, a latching mechanism, a plug-in mechanism or a sliding mechanism. Pressure cup ( 1 ) according to one of the preceding claims, characterized in that it comprises a closure element for closing at least one cup opening. Pressure cup ( 1 ) according to claim 21, characterized in that the closure element is a lid, a stopper, a sealing foil or a screw cap. Pressure cup ( 1 ) according to one of the preceding claims, characterized in that it is suitable for receiving a holding means ( 5 ) is configured. Pressure cup ( 1 ) according to claim 23, characterized in that the holding means ( 5 ) by means of latching, screwing, plugging, pressing, bayonet, rivet or adhesive connection on the cup ( 1 ) is attached or attachable. Pressure cup ( 1 ) according to claim 23 or 24, characterized in that the holding means ( 5 ) a lead ( 56 ) whose shape at least approximately with a depression ( 41 ) in the pressure cup ( 1 ) corresponds. Pressure cup ( 1 ) according to one of claims 23 to 25, characterized in that the holding means ( 5 ) at least partially a coating, in particular an anti-slip coating ( 54 ) having. Pressure cup ( 1 ) according to one of the preceding claims, characterized in that it comprises an adapter ( 8th ) for attaching the cup ( 1 ) on a spray gun ( 6 ) having. Adapter ( 8th ), characterized in that it is used for attaching a pressure cup ( 1 ) according to one of claims 1 to 27 on a spray gun ( 6 ) is configured. Adapter ( 8th ) according to claim 28, characterized in that it has at least one internal thread ( 83 ) and an external thread ( 81 ) having. Adapter ( 8th ) according to claim 29, characterized in that the internal thread has a coarse thread ( 83 ) with a pitch of 4 mm to 6 mm and the external thread a fine thread ( 81 ) with a pitch of 1 mm to 3 mm. Adapter ( 8th ) according to one of claims 28 to 30, characterized in that it comprises at least one sealing element ( 85 ) having. Spray gun ( 6 ), in particular pressure cup gun, characterized in that it comprises a pressure cup ( 1 ) according to one of claims 1 to 27. Spray gun ( 6 ) according to claim 32, characterized in that it comprises an adapter ( 8th ) according to any one of claims 28 to 31. Spray gun ( 6 ) according to claim 32 or 33, characterized in that they at least one Riser ( 67 ), a pressure relief valve ( 72 ) and a one-way valve ( 65 ), in particular a check valve. Spray gun ( 6 ) according to one of claims 32 to 34, characterized in that it comprises a device ( 64b ) for connecting probes to the spray gun ( 6 ) having. Spray gun ( 6 ) according to claim 35, characterized in that the device ( 64b ) is designed for connecting probes as a quick coupling.

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