Patent Document

CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation of U.S. patent application Ser. No. 08/433,832, filed May 4, 1995 now abandoned. 
    
    
     BACKGROUND OF THE INVENTION 
     The invention relates to a discharge apparatus for one or more media, whereof at least one can be non-gaseous, e.g. liquid, pulverulent, etc. and/or at least one can be gaseous, e.g. air. Such discharge apparatuses can be formed solely by a discharge head for fixing to a pressure generator, such as a thrust piston pump, a compression or bellows pump, etc. or can form a constructional unit with such a pressure generator or an associated medium reservoir. 
     The discharge apparatus has one or more medium outlets, outlet channels, volume-variable chambers for manual pressure generation, valves or flow-varying control or adjusting bodies, etc., which guide the medium responsive to actuation. Actuation can occur by direct manual actuation which narrows the pressure chamber. Actuation can also occur by charging the pressure chamber to a delivery pressure and manually opening the outlet channel. 
     In such discharge apparatuses there is a need to influence the flow behavior in zones spaced upstream from close to or after the medium outlet. For example, the medium flow during the time of a single discharge process can be influenced for adapting to changes in the delivery pressure or can be influenced in order to obtain an optimum precise dosing of the discharge quantity per discharge process. 
     SUMMARY OF THE INVENTION 
     An object of the invention is to provide a discharge apparatus avoiding the disadvantages of known constructions or leading to advantages compared therewith for example in apparatus of the aforementioned type A simple construction permits a random influencing of the medium flow after leaving the pressure chamber at a random point between said pressure chamber and the medium outlet adjacent to the open environment. 
     According to the invention a core or other adjusting body for varying the medium flow is provided in such a way that with increasing delivery pressure, a narrowing or the like of a passage cross-section is possible. This modification of the passage cross-section can take place by separate manual actuation in such a way that the particular setting is maintained independently of the actuation or delivery pressure, and/or can be path dependent of the actuation or pressure-dependent, namely automatic as a consequence of said discharge actuation of the discharge apparatus. 
     If at least one medium outlet is formed by a relatively narrow nozzle of less than 8, 4 or 1 mm, and in particular by an atomizing nozzle, whose flow paths form a nozzle geometry influencing the flow behavior, then independently of the described construction, a control or adjusting body can be provided for varying said nozzle geometry in such a way that the passage cross-sections of the discharge nozzle are variable. The changes can always leave free passage cross-sections or completely close the outlet or discharge channel in such a way that at least one medium is blocked against access to the medium outlet. 
     The adjusting body can also be used for varying the flow geometry and therefore the flow-influencing action of a turbulence or whirling chamber, in which separate media are brought together for mixing or the like or transformed into turbulent or rotary flows. 
     In particular a control or adjusting body can have, following on to an inner and/or outer circumference, a substantially planar or at the most flat, obtuse-angled end or control face, which is movable through the adjusting movement with respect to a correspondingly constructed opposite face and with the latter defining a disk-shaped, flat, but variable passage gap. A longitudinal channel transversely connected to the outer circumference of this passage gap can remain substantially unmodified or can be modified by the adjusting movement with respect to its flow-influencing action or its passage cross-sections. 
     It is particularly appropriate to provide at least two passage cross-sections variable by the adjusting movement in spaced manner in the delivery direction, or in immediately succeeding form, and which are modified in opposition. If one passage cross-section is increased or leads to a more quiet flow, the other is appropriately decreased or brings about a more turbulent or faster flow and vice versa. Advantageously the arrangement is such that during the discharge feed, the first passage cross-section in the flow direction is increased and the second is decreased, or in that the return movement is given a reversed sequence. 
     The path of an adjusting body from the starting position to the end position can also be used for dosing or limiting the discharge quantity, or to end the discharge, despite the actuation of the discharge apparatus and the delivery pressure consequently prevailing in the pressure chamber, although e.g. a discharge valve opening in pressure-dependent manner is completely opened. For this purpose, between the valve seat and a narrow flow channel following onto the same in the flow direction, there is a widened, ring or disk-shaped, flat intermediate chamber into which the medium enters directly from the valve seat and which can also be penetrated by the valve or adjusting body. 
     Such an intermediate chamber or some other chamber can also be constructed as a pump or displacement chamber, volume-variable by an adjusting body, and from which the medium is displaced during movements of the adjusting body, so that as a result additional delivery energy is provided. As a result of this or also through other means, an adjusting body can ensure that the medium discharge starts suddenly, virtually with the maximum discharge energy and/or is suddenly ended, so that there is no slowly rising or falling discharge, but instead an intermediate medium discharge. This is particularly advantageous for a very finely atomized discharge, so as to also ensure a very fine atomization at the beginning and/or end of the discharge. The medium outlet can also be formed by a foam nozzle, in whose vicinity is foamed a foamable medium, e.g. accompanied by the supply of a gas, the foam formation being influenced by an adjusting or control body. 
     The adjusting body can be driven by a piston via an intermediate drive, but it is appropriately rigidly or integrally connected to said piston in such a way that it is necessarily, simultaneously or synchronously driven and there is a direct mechanical drive. The adjusting body can be formed by a piston and the piston by a valve body. 
     An adjusting body can have each of the said constructions and effects in random combination or it is possible to provide for the same separate adjusting bodies. It is particularly appropriate if the adjusting body forms a preinstalled subassembly with a mounting, a valve seat, a return spring, a piston or valve body, a closure for the pressure chamber, and the like, which can be subsequently installed on the casing forming the pressure chamber. A discharge head includes the medium outlet, etc. and can appropriately be fixed between the two latter subassemblies. 
     It is particularly advantageous to provide, in the vicinity of an adjusting body or in the flow direction following the same, a second medium flow supply or a supply of a second medium to the first medium flow, whereby said second medium can have a different aggregate state from the first medium, e.g. can be gaseous. This significantly improves the atomization or foaming or the supply of the second medium to the medium outlet or the like can begin before the corresponding supply of the first medium or can end after the end of the supply of the second medium. 
     A dispenser for discharging media to be used in conjunction with a pressure chamber, in accordance with an inventive arrangement, comprises: a medium outlet defined by a first duct end of a linear end duct including a second duct end remote from the first duct end; an outlet channel leading into the end duct, the outlet channel defining a medium flow with a flow direction toward the medium outlet during dispensing operation, the outlet channel having a channel portion directly connecting to the end duct, the channel portion including channel boundaries including an inner circumferential surface and a recessed end face directly connecting to the inner circumferential surface, the channel portion connecting to the pressure chamber and being operable for producing a delivery pressure in an increasing range between a relatively lower medium pressure and a relatively higher medium pressure, the channel portion determining passage cross-sections; a core body operatively bounding the channel portion opposite to the channel boundaries, the core body being operationally unidirectionally movable from an initial control position to a control end position in a first control direction defined by a first core motion for varying the medium flow and for modifying the medium flow together with the increasing medium pressure to thereby vary the passage cross-sections, wherein the core body has outer faces including an outer circumferential face and a free end face, the outer faces directly facing the channel boundaries, in the initial control position of the core body and of the dispenser, the outer faces and the channel boundaries commonly bounding an angular passage gap for passing the medium, the angular passage gap including an axial gap leg defining first flow cross-sections, the first flow cross-sections being constant during the first core motion and the dispensing operation, the passage gap including a transverse gap leg directly connecting to the axial gap leg at an angle and defining second flow cross-sections, the second flow cross-sections varying substantially continuously during the first core motion and the dispensing operation, the transverse gap leg being oriented transverse to the first control direction and being located downstream of the axial gap leg, the transverse gap leg being bounded by a groove. 
     A dispenser for discharging media to be used in conjunction with a pressure chamber, in accordance with another inventive arrangement comprises: a medium outlet defined by a first duct end of a linear end duct including a second duct end remote from the first duct end; an outlet channel leading into the end duct, the outlet channel defining a medium flow with a flow direction toward the medium outlet during dispensing operation, the outlet channel having a channel portion at a distance upstream from the medium outlet, the channel portion connecting to the pressure chamber and being operable for producing a delivery pressure in an increasing range from a relatively lower medium pressure to a relatively higher medium pressure, the outlet channel determining passage cross-sections; a core body operatively associated with the outlet channel and movable during the dispensing operation in a first control direction from an initial control position to a control end position by a first core motion for varying the medium flow, the core body being movable in the first core motion for modifying the medium flow together with the increasing delivery pressure to thereby vary at least one of the passage cross-sections; the core body having a circumferential face and an end face connecting to the circumferential face; and, the channel portion including at least one angular channel groove, the at least one angular channel groove including an axial groove leg located at the circumferential face and a transverse groove leg downstream angularly directly connecting to the axial groove leg, the transverse groove leg being oriented transverse to the first control direction and located at the end face. 
     The transverse groove leg is recessed in the end face including a center chamber, the transverse groove guiding the medium flow radially inwardly into the center chamber. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     These and other features can be gathered from the claims, description and drawings and the individual features, either singly or in the form of subcombinations, and can be implemented in an embodiment of the invention and in other fields and can represent advantageous, independently protectable constructions for which protection is hereby claimed. Embodiments of the invention are described in greater detail hereinafter relative to the drawings. 
     FIG. 1 is a discharge apparatus according to the invention in axial section. 
     FIG. 2 is a detail of FIG. 1 on a much larger scale and in a modified construction. 
     FIG. 3 is a section through the arrangement according to FIG. 2 in a modified construction. 
     FIG. 4 is another embodiment in a representation corresponding to FIG. 2. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The discharge apparatus 1 has a body 2 and an insert member 3 supported thereon for fixing to the narrowed neck 5 of a container 4, whose container space serves as a medium reservoir for storing two separate media, e.g. a liquid and air. The container 4 is a resilient squeezing bottle with bending-elastic plastic walls resiliently elastic by external manual pressure on the casing and/or at least one end face. However, it can also be dimensionally rigid or contain a propellant, such as an aerosol producing the delivery pressure. 
     As a result of the compressibility, the container 4 forms a type of balloon pump, whose pressure chamber 3 formed by the storage space for the entire medium supply, is manually volume-modifiable. Within the pressure chamber 8 is a further, identically acting pump 7 for the second medium, for example air, whose pressure chamber 9 is formed by a film bag, which can be non-destructively folded together accompanied by complete emptying in such a way that its volume only roughly corresponds to the material volume of its walls. The pressure chamber 9 is so refilled from the outside with air that the pressure chamber 8, independently of its filling state, does not take up air and instead always remains completely full. The supply of the first medium from the pressure chamber 8, or the subsequent restoring or return of the container walls, leads to a corresponding enlargement of the pressure chamber 9, accompanied by a simultaneous air suction from the outside. 
     An outlet or discharge channel 11 passes from the pressure chamber 8 through the neck 5 and the bodies 2, 3. An outlet or discharge channel 12 substantially separate therefrom leads from the pressure chamber 9 in spaced manner from the neck 5 through the wall of the container 4 and the body 2. The outlet channels 11, 12 issue into a common medium outlet 13, but before this, the outlet channels are brought together, so that the two media pass in mixed form out of the medium outlet 13. outlet 13 is provided in an exposed outer surface of the body 2. The medium outlet 13 is formed by the outer end 16 of a nozzle or end channel 14, whose diameter is under 1/2 mm or is 1/10 mm. The cylindrical end channel 14 has, compared with its smallest width, an at the most 3 to 5 times greater length and is widened in funnel-shaped manner at both ends 15, 16 or passes through with a constant inside width up to at least one of said ends. 
     In the flow direction in the outlet channel 11 are successively provided three flow restrictors or valves 17, 18, 19, which act on the entire medium flow in the outlet channel 11, either for opening and closing the outlet channel or for only for increasing and decreasing the passage cross-sections. All the valves 17 to 19 are simultaneously operated by a single adjusting body 20, which has a core body 21 closer to the end channel 14 and a valve body 22 directly connected to the core body 21 in rigid or axially movable connection. On the side remote from the core body 21, the valve body 22 has a shaft 23 projecting into the neck 5 belonging to the pressure chamber 8 and which carries on the inner end a disk-shaped abutment 24 for a return spring 25. The spring 25 surrounding the shaft 23 is supported by one end on the abutment 24, with the other end on the inner end face of the insert member 3, roughly in the plane of the outer end face of the neck 5. 
     The ring disk-shaped insert member 3, optionally constructed in one piece with the body 2, forms a frustum-shaped valve seat 26 widened in approximately right-angled manner in the flow direction and provided as an inner circumference, serves for the closing engagement of a similar frustum-shaped closing face 27 on the outer circumference of the disk-shaped valve body 22. The valve seat 26 is formed by a frustum-shaped collar projecting into the neck 5 of the otherwise planar insert member 3, which is so fixed between the body 2 and the end of the neck 5 that it simultaneously forms the bottle closure or the seal between the container opening and the body 2. In the starting position, or with the pump 6 not operated, the valve 17 is tightly closed. The valve body 22 forms a control piston exposed to the pressure in the pressure chamber 8, and which in the case of an over-pressure in the pressure chamber 8, opens the valve 17, accompanied by a displacement of the adjusting body 20 in the flow direction, so that then between the surfaces 26, 27 is formed a passage gap for the medium extending over the circumference. 
     In the starting position, the valve 18 or 19 is maximally opened. In the maximally opened position of the valve 17, valve 18 or 19 is maximally narrowed or completely closed. The circular, planar valve seat 28 of the valve 18 in the starting position of the larger, diskshaped, planar end face of the valve body 22 has a gap spacing with respect thereto and is formed by a circular depression on an inner end face of the body 2. The closing surface 29 of the valve 18 is formed by the said end face of the valve body 22, the valve seat 28 having a larger external width. Thus, the valve seat 26 is directly connected to the ring disk-shaped gap 34 between the valve surfaces 28, 29, which is also traversed by the core body 21. The greatest width of the valve seat 26 is smaller than the greatest width of the valve seat 28. The greatest width of the valve seat 26 can also correspond to the greatest width of the valve seat 28. 
     In FIG. 2, end channel 14 is provided with a conical inner end 15 and a conical outer end 16. Inner end 15 opens into valve 19, shown in larger scale in FIG. 2. Valve 19 has much narrower valve faces 30, 31, namely, on the body 2 a valve seat 30, and facing the valve face 30, a closing face 31, which is formed by the outermost end face of the core body 21 remote from the valve body 22. The valve faces 30, 31 are also substantially planar and circular. The valve seat 30 surrounds the inner end 15 of the end channel 14, which traverses a one-piece end wall 37 of the body 2. In the starting position, between the valve faces 30, 31, a further, ring disk-shaped passage gap 35 is defined, which is traversed by no component within its outermost circumference and whose axial gap width, as a function of requirements, can be the same, larger or smaller than that of the passage gap 34. In the case of a smaller width of the passage gap 35, the closing face 31 strikes against the valve seat 30, so that the gap 34 with the narrowest passage cross-section remains open despite the possibly closed valve 19. With a larger gap width, the closing face 29 impacts, whereas the gap 35 of the valve 19 remains open in the narrowest state. For the same gap width, or same stop spacing, both valves 18, 19 close simultaneously by stop limitation, but means can be provided in order to keep free a minimum passage cross-section through the particular valve 18, 19. One to all the valves or constrictors, the faces thereof, the end channel 14, the medium outlet 13, the neck 5 and the adjusting body 20 are appropriately located substantially in a single central axis 10, with respect to which the container 4 can be equiaxial or eccentric. 
     The core body 21 has a cylindrical circumferential surface 32, which continues over its entire length and is connected to the end face 31. Surface 32 faces an opposite surface 33 formed by an inner circumferential surface of the body 2 connected to the end faces 28, 30. Between the faces 32, 33, according to FIG. I can be provided an envelope gap 38 passing over the circumference and connecting the gaps 34, 35. According to FIG. 2, the faces 32, 33 can be substantially tight or engage in sliding manner on one another. The length of the envelope gap 38 or the engagement of the core body 21 in the associated depression on the inside of the body 2 in the starting position is greater than the gap width of the gaps 34, 35, so that the core body 21 always engages in the depression. Axial adjusting movements of the core body 21 may have no influence on the passage cross-section of the channel portion 38 connecting the channel portions 34, 35, or can increase or decrease the passage cross-section as a function of the desired discharge behavior. 
     Chambers 34 and 35 simultaneously form volume-variable pressure or pump chambers, which with increasing delivery pressure, are constricted by the members 22, 21 acting in thrust piston-like manner, and consequently discharge the medium towards the medium outlet 13. The effective piston face of the piston 21 formed by the end face 31 is smaller than the effective piston face 29 or 27. The piston face 27, used for opening, can be larger than the piston face acting in the opposite direction or can be roughly the same size. The openings 12 to 16, 35, 38, the faces 30, 33 and the wall 37 can also be provided on a separate nozzle cap with an approximately constant wall thickness, inserted in fixed manner in the body 2 or movably inserted for performing the adjusting movements, the core body 21 then engaging therein. 
     The outlet channel 12 terminates in a mouthpiece 36, which is connected approximately radially or tangentially to the outer circumference of one or more of the gaps 34, 35, 38, and appropriately with the core body 21, in the starting position, is directed only against its circumferential surface 32 or is located roughly in the center of the length of the circumferential surface 33. By means of an admission valve 39 opening in pressure-dependent manner, and through a portion of the outlet channel 12, air is sucked from the outside. In the flow direction following the one-way valve 39, closing under overpressure in the chamber 9, an outlet or discharge valve 40 is provided in the outlet channel 12. Outlet or discharge valve 40, e.g. a spring-loaded one-way or overpressure valve, opens when there is overpressure in the chamber 9, so that air appears at the mouthpiece 36 with a correspondingly high pressure. For any position of the core body 21, the mouthpiece 36 can be opened to the same or different extent or in one of the positions, e.g. one or both end positions, such as the starting position, can be closed. The particular chamber or gap into which the mouthpiece 36 issues, simultaneously forms a mixing chamber, in which and as from which the two media are uniformly intermixed by whirling or turbulent action. 
     In order to further improve the discharge behavior or mixing appropriately, means 41 are provided for influencing the flow and in particular, for modifying the flow direction, speed, turbulence and rotation. For example, the particular chamber 34, 35, 38 can be constructed as a turbulence or whirling chamber, in which one or both media are made to flow-rotate about the central axis 10 in such a way that said rotation continues into the end channel 14, the medium outlet 13 and beyond the same, and consequently, at least one whirling device 42, 43 is formed. The particular whirling chamber 34, 35 can be provided on one or both ends 30, 31 or circumferential surfaces 32, 33 with guide faces of the means 41 or the whirling device 42 in such a way that a strong mixed turbulence or rotary flow is produced. 
     Along the circumferential surface 32 are provided axial, slotlike longitudinal channels 44 in the core body 21, which with their one ends in each position, are connected open to the channel portion 34, or in at least one position, particularly the end position, are closed by the valve 18. The other end of the longitudinal channel 44 passes in angular manner into a slot-like transverse channel 45 in the end face 31, whose radially inner end remote from the longitudinal channel 44 issues into a dish or cup-shaped depression 46, which is also provided in the end face 31. The bottom of the depression 36 can be located in the plane of the bottom face of the channel 45, or with respect thereto, can be displaced towards or away from the end channel 14. 
     The width of the depression 46 is greater than that of the channels 44, 45 and in each case one side of each channel 45 is tangentially connected to one end of a portion of the inner circumference of the depression 46, curved in a concave manner about the central axis 10. The passage cross-section of the channel 45 is continuously constricted in funnel-shaped manner towards the chamber 46, e.g. by acute-angled convergence of its facing sides. The length of the channels 44 or the core body 21 can be much the same as the external width thereof, or can be significantly smaller than it. The inside width of the chamber 46 is greater than that of the channel portions 14 or 16 or the inner circumference of the valve seat 30. The depressions 44 to 46 can be provided only in the core body 21 and are then closed or closable at its open slot or depression side by the depression-free faces 33, 30 of the body 2. However, this depression can also be provided exclusively in the surfaces 33, 30 and can be correspondingly closed or closable by the depression-free surfaces 32, 31 of the core body 21. The depression can also be provided in both associated surfaces. 
     In the embodiment according to FIG. 1 said channels or depressions are not provided, and therefore the valve 19 is closed in the operated end position of the core body 21. In the embodiments according to FIGS. 2 and 3, the valve 19 is not to be completely closed, and instead the line connection from the channels 44 to the medium outlet 13 always remains open. In the depression 46, the first medium, under centrifugal force, is given a right-rotating flow according to FIG. 3 along the inner circumference and around the jointly flowing air located in the center and simultaneously, the first medium passing longitudinally out of the channels 44 by rebounding on the surface 30, is passed back against the surface 31 and the depressions 45, 46, and also the resulting turbulent medium flow on approaching the surface 31 or the depressions 45, 46 on the end channel 14 passes into the latter. At the end of this process the supply of both media to the end channel 14 is abruptly broken off by closing the valves 18, 19, whereas in the embodiment according to FIGS. 2 and 3, only the supply of the first medium is abruptly broken off by closing the valve 18, whereas the second medium continues to flow out through the end channel 14 and can completely clean, with respect to the first medium, the outlet opening 13, channels 14 to 16, chamber 35 and depressions 44 to 46. 
     According to FIG. 1, the mouthpiece 36 is radially or tangentially directed with radial spacing in each position against the circumferential surface of the core body 21. According to FIG. 2 the mouthpiece 36 in the starting position is radially directed against the transition area between the two channels 44, 45, so that air flows directly from it roughly radially or linearly into the transverse channel 45 and then enters the depression 46. In the other end position, the mouthpiece 46 is directed to almost its full width against the bottom face of the longitudinal channel 44. According to FIG. 3, the opening 36 of the outlet channel 12 issues tangentially onto the circumference 32 or 33, which can have a circumferential channel 47 linking the longitudinal or transverse channels 44, 45, so that the second medium is given a rotary flow on said circumference and roughly simultaneously enters two or more channels 44, 45. The rotary flow in the circumferential channel 47 can be directed in the same or opposite directions to the rotary flow in the depression 46 about the central axis 10. Moreover, the slot depression forming the circumferential channel 47, as described relative to the depressions 44 to 46, can be exclusively provided in the surface 32 or the surface 33 or in both surfaces according to FIG. 3 and can be closed on the open depression side. The channel 47 may only be provided in the vicinity of the longitudinal channels 44, only in the vicinity of the transverse channels 45 or in the transition area between both channels 44, 45. The passage cross-section of the channel 47 can be roughly the same or smaller than that of the outlet channel 12. 
     In the embodiment of FIG. 4 the core body 21a is directly formed by the body of the valve 17a which, unlike in FIGS. 1 to 3, does not carry the core projection on its widest end face 29a, and instead, is continuously planar or provided with depressions. The chamber 34a is separated by an intermediate wall 49 from the chamber 35a, having a larger axial extension and one side thereof forming the end face 28a of the valve 18a. The other side of the wall 49 facing the end channel 14a carries a projection 48, projecting freely into the chamber 35a and forming a nozzle 50 located in the central axis 10a. The projection 48 tapers in frustum-shaped manner in the flow direction on the outer circumference, is internally traversed by a linear nozzle channel 51 of a roughly constant width and forms at the free end a nozzle opening 53 located in the axis 10a, and which in spaced manner, faces the inner end 15a or end face 30a, said spacing being roughly the same or smaller than half the axial extension of the chamber 35a or the width of the nozzle opening 53. On the circumference, the nozzle opening 53 is bounded by a cross-sectionally acute-angled sharp tear-off or ring edge 52, which is bounded on the inner circumference by the channel 51 and on the outer circumference by the conical outer face of the projections 48. 
     The end channel 14a is widened in frustum-shaped manner from the inner to the outer end 16a and the width of its inner end 15a is greater than the width of the equiaxial, upstream spaced nozzle opening 53. The preatomizing nozzle 50, constructed like the end channel 14a in one piece with the body 2a, assumes in any operating state the same position with respect to the end channel 14a. The intake end of the channel 51 remote from the nozzle opening 53 issues into the valve seat 28a. In the case of an overpressure in the pressure chamber 8a, the valve 17a increasingly opens, while simultaneously the valve 18a associated with the nozzle 50 increasingly closes. Approximately over the entire axial extension, the outlet channel 12a issues radially and/or tangentially in the described way into the chamber 35a, so that the second medium is given a circular rotary flow around the projection 48. The chamber is entered by the first medium sprayed into the center from the opening 53, namely in the gap region formed between the faces 30a, 52 and which brings about a strong flow acceleration. On leaving the opening 53, the first medium can have the same or oppositely directed rotary flow. 
     As from the vicinity of the opening 53, the media mix are strongly whirled up again on flowing along the inner, acute-angled, sharply flanked ring edge of the inner end 15a and pass out at the medium outlet 13a as a more strongly atomized spray cone. Due to the fact that with the nozzle 50 only the first medium is atomized in a first stage, and in particular accompanied by the supply of the second medium, and then both media are jointly atomized with the nozzle 14a in a second, separate stage, extremely small atomized particles uniformly distributed over the spray jet cross-section are obtained. There is a high constancy with respect to these characteristics from the start to finish of the discharge process. 
     The pressure chamber for the outlet channel 12a can also be formed by the cylinder chamber of a manually operable thrust piston pump, which is to be repeatedly filled during the return stroke from a separate medium reservoir or from the atmosphere by subsequent suction by means of an admission valve. In this connection, two e.g. equiaxial, separate pumps or pressure chambers can be simultaneously operated with a common handle. During the return of the core body 21a counter to the flow direction, the volume of the chamber 34a or 35a is increased again and as a result of the underpressure formed, the supply of the first medium to the end channel 14a is suddenly broken off or said medium is sucked back. 
     Each feature of each of the embodiments can be provided in each of the other embodiments. The indicated characteristics, such as sizes, relative positions, actions or the like can be provided precisely as described, in slightly diverging manner, substantially as described or varying therefrom to a greater or lesser extent, depending on the discharge characteristics required or the characteristics, particularly flow characteristics, of the first and/or second medium.

Technology Category: 7