EP0901836A2 - Fluid dispenser - Google Patents

Abstract

The dispenser (1) has two manual dispenser units (2,3) with first/second main bodies (4,5), and define an actuating stroke with stroke direction and path. The unit has a pressure chamber (12) with walls (16) and an outlet channel (14) with medium outlet (15). To vary the volume of the pressure chamber, chamber walls and medium outlet are moved by the trigger at least partially over the actuating stroke. Alternatively, the second dispenser unit may contain a linear moveable guide body (53) for the medium.

Description

The invention relates to a donor. With it can flow or other media, for example liquid, pasty, powdered or gaseous media, stored, conveyed or delivered to a media outlet away from the donor can. The dispenser can be used by the user with a single Hand carried freely and with this hand at the same time be operated with one hand, with a force which is the medium promotes.

The donor can refill his print room with the Medium, for example from a media storage and suck in the medium on the return stroke. The donor can but also in the manner of a disposable dispenser for actuation only be determined via a single, rectified pump stroke. Then the entire stored media volume is from the start contained in its pressure chamber. This medium can then over a single stroke or over one another stroke-limited partial strokes are metered out of the pressure chamber become. The pressure chamber housing is expedient on the Unit provided which is movable or with the media outlet is movable.

The invention has for its object to a donor create the disadvantages of known training are avoided and that is particularly the case with more precise or changeable Dosage a tilt-free storage of his donor units, high tightness, one essentially smooth outer surface or high functional reliability guaranteed.

According to the invention there are provided: sling means for fixing a stroke or a mechanical positive control as actuating means for a flow or pressure compensation valve or combined into one assembly unit Connection elements for connecting the dispenser to a support body or engaging members for sealed engagement of the two dispenser units outside the pressure chamber or Medium for preventing contamination of the medium. Thereby can e.g. the discharge volume per stroke-limited working stroke or stroke distance can be precisely determined and possibly also changed; furthermore, the donor can be easily attached to the Attach carrier, for example a bottle, and can on different bottle shapes can be adapted; Furthermore media residues from the Media outlet back into the dispenser behind the valve seat an exhaust valve sucked back or the pressure chamber vented become; Finally, foreign objects can penetrate, like germs or dirt, in the dispenser in a simple way be avoided.

Means are expediently provided in the upside-down position in the Suck in the dispenser medium or discharge it with the dispenser medium. In the overhead position, the media outlet is down directed and it is below the pressure chamber or Memory. Means are also provided for the medium atomized from the media outlet in precisely pre-dosed quantities emerges as a drop and this drop then as a whole detaches from the media outlet, namely from its boundary edge tears off. Individual dispenser parts or fully assembled dispensers are designed so that they can be sterilized, if necessary cold can, for example, by exposure to gamma rays.

The flow valve can be separated from the lifting gear provided or connected to them, e.g. through sealed Guide a movable valve body on one of the Stop members. This stop member can together with the Valve body as a pre-assembled unit in the second base body or the discharge head inserted or with this Base body are formed in one piece. The first donor unit contains a free protruding driver, which via a snap clutch that only engages and disengages depending on the force is connected to the valve body and this positively in the desired valve position, for example the open position, transferred. After that the Coupling connection disconnected again depending on the force and the Valve body in its other valve position under spring force returned. In this way e.g. through the media outlet and the outlet duct air from the pressure chamber during only a first part of the return stroke of the dispenser.

The dispenser has a fastening body, such as an annular disk Flange for a Crimean ring or a cap for connecting it to a storage bottle. At the Inside of this mounting body are a free in the Storage projecting riser or suction pipe, a seal Fastener for positive engagement in the memory and / or a body delimiting the pressure chamber as Connecting members, of which at least two to all Links a pre-assembled or one-piece assembly unit for attachment to the accumulator or to the first body form. By changing this unit, the Donors to very different forms of storage or flow properties be adapted by media. As a pressure chamber limiter are e.g. a cylinder jacket and a piston are provided, each of which belongs to the assembly unit mentioned can. This delimiter can also be used for other media rooms limit and possibly the driver or a coupling member of the Form valve actuation. This is for overhead operation said riser pipe not provided, so that in the overhead position the medium through a gradient directly into the pressure chamber can flow regardless of the filling level of the storage.

The second dispenser unit provided as the actuation unit is useful with peripheral surfaces or the like Sliding surfaces, so sealed on the first storage unit led that interiors outside the pressure chamber the donor are sealed to the outside, especially in the Area of several, separate ring zones, which are interlinked lying, jacket-shaped projections are formed and radial spaced apart. This results in separate, nested and against each other in the starting position and / or annular spaces sealed over the stroke. An extreme one Coat can therefore have a window-like breakthrough be provided for guiding a cam or the like without Dirt over the next one, in this outermost coat Projection can penetrate inwards.

According to the invention are also means for venting the media rooms, especially the pressure chamber, the media outlet and all media rooms connected between them. This way, these media rooms can be used the first time of the donor quickly filled with medium by priming become. The valve actuation described is suitable for this purpose, which the exhaust valve over a first part of the return stroke keeps open so that the compressed air can easily escape can without the valve spring also the exhaust valve to have to keep open. The ventilation of the media storage for Pressure equalization for the amount of media removed in each case can can also be achieved via a further valve that with the manual operation is opened or closed. E.g. it can be closed and in the initial position of the donor be open in all other stroke positions. The the valve penetrating ventilation path can then be completely separate be provided by the media rooms.

Fig. 1

einen erfindungsgemäßen Spender, teilweise in Ansicht, teilweise im Axialschnitt und in Ausgangsstellung der Austragbetätigung,

Fig. 2

einen Ausschnitt der Fig. 1 in vergrößerter Darstellung sowie kurz nach dem Beginn des Rückhubes und

Fig. 3

eine weitere Ausführungsform des Speicheranschlusses.

These and further features of the invention are also apparent from the description and the drawings, the individual features being realized individually or in groups in the form of sub-combinations in one embodiment of the invention and in other fields and representing advantageous and protectable designs for which protection is claimed here. Embodiments of the invention are shown in the drawings and are explained in more detail below. The drawings show:

Fig. 1

a dispenser according to the invention, partly in view, partly in axial section and in the starting position of the discharge actuation,

Fig. 2

a section of FIG. 1 in an enlarged view and shortly after the start of the return stroke and

Fig. 3

a further embodiment of the memory connection.

The dispenser 1 has two linear and axial against each other movable dispenser units 2, 3, each with a one-piece Base body 4, 5 and is for attachment to one Carrier or media storage 6 determines which is then a component the first unit 2 or the first base body 4 forms and be formed in one piece with the latter can.

The second base body 5 of the second unit 3 comprises one Discharge head 7, which is also in one piece with the Base body 5 can be formed, but here a separate, elongated cap-shaped component. Completely encapsulated within the body 4, 5 is a media pump 8, namely a thrust piston pump, provided with which the Medium from the memory 6 abruptly on its return stroke is sucked in and then discharged during the working stroke. Fig. 1 shows the discharge device in the starting or rest position, from which the units 2, 3 against each other manually over the working stroke up to the stroke end position Spring force are to be moved so that the dispenser 1 is shortened becomes. The parts mentioned lie in a central dispenser axis 9. If necessary Except for springs, such as return springs all components of the dispenser 1 made of plastic, being as Injection molded parts can be made.

Stop and valve means 10 serve the amount of through the medium of the respective working stroke to be determined. The end of the working stroke is limited and by changing the length of the stroke, the discharged media quantity can be changed. The each Subsequent stroke can be rectified to the end Connect the previous working stroke if there is no return stroke or no return spring is provided or at the end of each The dispenser 1 can also move to its stroke-limited stroke Starting position returned and only then be operated again via the subsequent working stroke.

The means 10 are completely in the unit 3 or in Base body 5 so that the unit 2 is simply replaced can be.

From the memory 6 to a media outlet 15 adjoining range Media paths or media rooms that the Push units 2, 3 inside symmetrically to axis 9. An inlet duct 11a according to FIG. 3 protrude freely into the memory 6 against the direction of flow and with an annular channel section into an annular Pressure or pump chamber 12 of the metering pump 8 open. According to Fig. 1 limits for the overhead operation of the storage neck Inlet channel 11 from which the medium through the neck opening flows directly into the body 4, 5. Chamber 12 includes an axial section with larger passage cross sections and in the flow direction immediately afterwards one Axial section 13 with smaller passage cross sections than Connecting channel. Follow this in the direction of flow a narrowed axial section is provided, which in the area of a duct closure in the direction of flow an outlet channel 14 connects. This outlet channel 14 is only through a nozzle channel of a drop or atomizer nozzle formed, which with its downstream End forms the media outlet 15, is limited in one piece and only penetrates one end or end wall of the head 7. Of the Outlet duct 14 is therefore extremely short. It has a length the maximum two or three times larger than its largest Vastness is.

The pump 8 has a cylinder 16 and a piston unit 17 with a piston 18 that can be moved and sealed in the cylinder 16 on. The cylinder 16 is stuck or in one piece with the Base body 5 connected and protrudes against the flow direction freely into the body 4. The piston 17 can be fixed or be integrally connected to the body 4 so that the piston unit 17 free in the direction of flow and in the body 5 protrudes into it. The unit 17 can upstream from Piston 18 in the area of only a single end face on Body 4 attached and axially supported. Unit 17 can also be formed by a separate component, the stuck in or against the direction of flow in the body 4 is inserted.

The mentioned channel closure is dependent on the pressure opening and closing exhaust valve 19 formed up to whose valve seat can reach the pressure chamber 12 valve-free. The valve seat is through the inner surface of the above End wall of the head 7 is formed and is located at the inner end of the nozzle or Outlet duct 14. In addition to the pressure-dependent Valve actuation means 20 are provided, around the valve 19 at the beginning of the return stroke or positively open and during the rest Close part of the return stroke by spring force. Air can pass through the channel 14, 15 during this valve opening flow out of rooms 12, 13 into the open during the Piston 18 tightly closes the chamber 12. Are the Media rooms 12 to 14 then completely with non-compressible Medium filled, the valve opening is used for sucking back of medium from channel 14, 15 into the dispenser, thereby Media residues and possibly a small amount of air behind the Closure 19 are placed in chamber 12 and the channel 14, 15 is completely emptied.

The body 4 forms a mounting flange or a cap 21 with an end wall 22 and a jacket 23, in which the narrowed neck of the memory 6 axially stuck and braced intervenes. From the inside of the end wall 22 can counter Direction of flow of a riser pipe 24 according to FIG. 3 in the Memory 6 project freely, which is the upstream End part of the channel 11a from its inlet opening to Wall 22 limited in one piece. The line 24 can be in one piece with the body 4 or be a separate component, which is inserted linearly into the cap 21 in the direction of flow and is supported directly on the end wall 22, over which it does not protrude in the direction of flow. At this Inside the end wall 22 is also an annular disc Seal 25, which between the end wall 22 and the End face of the storage neck axially clamped and possibly in one piece is formed with the tube 24. 1 is for the Overhead operation no tube 24 is provided so that the liquid in the overhead position outside the memory 6 immediately the inside of the wall 22 is present.

On the inner circumference of the jacket 23 is a radially inward protruding fastener 26 provided, for example a screw thread, a ring-shaped snap cam or the like, that for mutual bracing of the bodies 4, 6 in one Counter link on the outer circumference of the storage neck with a positive fit engages and at a distance from both ends of the jacket 23 can lie. The link 26 is integral with the body 4 here 3, but can also be in one piece with the Tube 24 or the seal 25 may be formed. The outer circumference of the part 24, 25a then goes in the opposite flow direction directed jacket 23 over which on the inner circumference of the jacket 23 of the cap 21 (Fig. 1) and with this axially stuck via a resilient snap connection 26a connected is. The snap cam of this connection 26a can projecting radially inwards on the jacket 23a and / or on The outer circumference of the inner jacket 23 may be provided and engages each in a snap recess of the opposite Circumferential surface in a form-fitting manner. With the inner jacket 23 can the dispenser 1 or the cap 21 on a storage neck o. Like. With screw thread and without inner jacket 23 on one Storage neck with snap link are placed in the then the snap member of the jacket 23a engages tightly. The Wall 22 can also be designed as a ring flange without jacket 23 or be attached to the storage neck with a crimp ring. Furthermore, the snap member on the jacket 23 and the thread 26 be provided on the jacket 23a.

From the inside of the end wall 22 reaches into the storage neck, 3 also in the channel 11a, against the direction of flow a core or guide body 27 projects freely, over the length of the storage opening 11 or the channel 11a is annular. The body 27 is opposite to the direction of flow tapered at an acute angle and the jacket of the tube 24 can flow in the same direction in this area Cone angle should be expanded, being between the farthest end and the body 25 is formed a passage which the Seal 25 penetrates. 3 in Flow direction along the extension 27 and up to Chamber 12 expanded passage cross-sections of the channel 11a 1 continuously narrowed to approximately the wall 22 Flow cross sections. Form the parts 24, 25a, 23, 26, 61 a pre-assembled unit 30 which is attached to the body 4 fasten and secure axially with the snap connection 26a is. This unit 30 can also, if necessary in one piece, the Unit 17 belong, which makes for a very simple training results. 1, the extension 27 limits with the cylindrical inner circumference 11 of the storage neck in the direction of flow an initially narrowing channel section and then and up to wall 22 a much shorter widening channel section. From donor 1 only protrudes Extension 27 in the memory 6.

The body 5 also forms a cap 28 for receiving the downstream end of the body 4. This cap 28 has an end wall 29 and of this only against the direction of flow freely protruding a jacket 31 in which the body 4 engages permanently tightly enclosed. Of the End wall 22 are only three projections in the direction of flow or shells 32, 33, 34 in front, the radial distances from each other have and are coaxial. The sleeve-shaped Shells 32 to 34 are formed in one piece with the body 4. From the inner circumference of the jacket 32 to the cylindrical outer circumference of the piston 18 is the wall 22 of inlet openings 45 enforced, which directly to the channel 11 or 11a are connected.

From the end wall 29 are only opposite to the direction of flow three projections or sleeve-shaped coats in front, which also have radial distances from each other and coaxially with each other lie. The innermost jacket is through the cylinder 16 and outermost jacket formed by the cap jacket 31. Between these coats 16, 31, the jacket 35 is provided. All Shells 16, 31, 35 are formed in one piece with the body 5. The middle jacket 33 stands from the jackets 32 to 34 farthest and outermost jacket 34 least wide axially in front. Of the coats 16, 31, 35 is in the opposite Direction of the middle jacket 33 farthest and the outermost jacket 34 least axially forward. The coat 34 can have the same outside and inside width as the jacket 23.

The nozzle 7 is located in the direction of flow from the end wall 29 so that the wall 29 above him only on two opposite one another Protrudes radially outwards on all sides or on all sides. The jacket 39 of the head 7 can with one of the coats 16, 31, 35 are aligned. The outside forms around the jacket 39 the wall 29 is a pressure handle 36. It can move radially protrude outside the jacket 31 or only up to the jacket 31 or 39 are enough. Furthermore, it can the links 20, 41 to 44, 46, 49, 52, 53 and 58 surround.

The upstream end of the head 7 forms the most Inner and outer circumference cylindrical, sleeve-shaped jacket 39, which engages permanently in the wall 29 and is stuck or in one piece with the end wall of the Head 7 is formed. The bodies 4, 5, 7 overlap Guide or sealing means 40 are thus permanently movable into one another a that except through the channel 11 or the opening 15th no air can penetrate into the media rooms 12, 13, however a bypass path completely bypassing the media rooms 11 to 15 is created, through which through the body 4, 5 of outside atmospheric air in the constant volume storage 6 can flow in.

The bodies 5, 7 are axial and with a snap connection 41 radially clamped to one another, their circumference distributed snap links in one piece with the end of the jacket 39 are formed and their counterparts as separate Snap openings through wall 29. The head 7 can non-destructive by resilient narrowing of the jacket 39 the snap connection 41 can be released and removed. Of the Head 7 is to the exit or lying in the axis 9 Nozzle opening 15 conically tapered and suitable at an acute angle, inserted into a body or nasal opening or for delivery of a medical treatment medium in the open eye to be used, then the dispenser 1 in the upside down position is created.

The sling means 10 have two parallel to the axis 9 interlockingly adjustable against each other Stop members 42, 43 on each other about the axis 9 can be rotatable or non-rotatable. The opposite of the Piston raceway of the cylinder 16 is narrowed stop member 42 formed by the unit 17 and therefore axially stuck with connected to the body 4. The stop member 43 is by a formed by the head 7 or jacket 39 separate body, however axially as well as around the axis 9 with the jacket 39 connected, with which it could also be formed in one piece. The link 43 forms an annular disk shape radially inwards protruding wall through which the channel 13 narrows again goes through and then into an expanded calming chamber flows.

The unit 2, 4 forms close to the downstream end the unit 17, 42 an annular stroke stop 47, which on Body 5, 7 and 43 an annular counter-stop 48 so is assigned that by abutting the shoulder surfaces 47, 48th the maximum stroke distance or the stroke length of the working stroke is set. The surfaces 47, 48 lie in the axis 9 or only within the body 5, 7 and permanently in the Area or upstream of wall 29. Areas 47, 48 are in the pressure chamber 12, namely immediately downstream to channel 13 and her mutual Resting distance can be axially adjustable with adjusting means. At such a dispenser could be used instead of one Fine thread have a steep thread or a stepped backdrop, around the total stroke into individual, stroke-limited Subdivide stroke sections.

The stop member 43 extends on the outer circumference Ring collar 44 over which is stuck in the inner circumference of the Coat 39 or the wall 29 engages and in one piece with the Wall 29 is formed. From the upstream end of the sleeve-shaped stop member 43 may have a projection or a sleeve if necessary through the wall 29 in the jacket 16 freely against protrude the piston 18, the end face of the end face of the Piston 18 is permanently directly opposite, but also does not hit the piston at the end of the stroke. The all the way 48 graded narrowed inner peripheral surface of the sleeve 16 limits channel 13.

In the direction of flow is a projection or from the collar 44, 29 a sleeve 46 without contact in the tapered portion of the Jacket 39 in front, which like the sleeve 16 with respect to it Outside width is longer. Sections 16, 43, 44, 46 are axially fixed together or in one piece educated. Axial ribs can be on the outer circumference of the sleeve 46 or the like. Provided for centering the sleeve 46 evenly distributed on the inner circumference of the jacket 39 and tense.

For brief opening and automatic closing of the Valve 19, a driver 49 is provided on the unit 5, 17 and through the downstream end of unit 17 educated. The driver 49 is completely in the starting position within the sleeve 16 in the starting position of the units 2, 3 as the core body within the expanded Section of the chamber 12, which he only upstream in the center bounded in a ring by link 49. The driver 49 has a barb-like snap member 51 of a driver or Snap coupling 50, the second coupling or Snap member 52 on the axially reciprocable Valve body 53 of the valve 19 is provided.

The valve body 53 has two axially spaced apart lying sealing or piston lips 54, 55 on the opposite protrude freely and are ring-shaped. The upstream and directed lip 54 limits the called calming chamber and slides permanently sealed on the inner circumference of the sleeve 46. The downstream and directed lip 55 glides permanently sealed on the inner circumference of the jacket 39 and delimited another, expanded Calming chamber. The end wall of the lip 55 can one Form stop, which is at the valve opening on the end face the sleeve 46 strikes and thereby the maximum Opening path of the valve 19 is determined.

The upstream end of body 53 includes one sleeve-shaped mandrel 56 which is upstream of the lips 54, 55 against the flow direction freely against the member 43 as well as the driver 49 and this is permanently immediate opposite with the snap member 52. That link 52 stands as an annular cam radially inwards over the Inner circumference of the mandrel 56 in front and is resilient with this spreadable. The link 52 is immediately adjacent to the End wall 43, which is between the bodies 16, 46 and 47, 52 lies and their upstream from the member 52 lying end face within the collar 44 the stop 48 forms. The wall 43 is of a narrowed passage opening interspersed, which from link 49, 51 again when passing is narrowed. The driver 49 is not included until the pump stroke its snap member 51 closely fitted in and through this Passage opening moved through until the dimensionally stable snap member 51 first clicks into the link 52. As soon as the Strike surfaces 47, 48 together, close them as otherwise always open valve 37 the upstream Section of the pressure chamber 12, the volume of which is thereby reduced is, so that the valve 19 closes immediately.

At the beginning of the return stroke, the driving member 51 leads one short empty path opposite link 52, after which it is only on Link 52 strikes, the body 53 against the direction of flow takes along and thereby opens the valve 19 until it stops. After that and after the smaller part of the return stroke the link 51 is characterized by the axial restoring forces the link 52 torn out by this resiliently expanding. The valve body 53 is also released after being released by the link 51 a spring 58 moved back in the flow direction, whereby the Valve 19 closes.

The restoring forces for units 2, 3 are determined by a Spring 59, such as a coil or compression spring, which causes is completely outside of media rooms 11 to 15 and engages between the coats 33, 34 and 31, 35, so that their ends are supported directly on the walls 22, 29. The spring 59 could also be in one piece with at least one of the Links 16, 17, 32, 58 may be formed. The screw or Compression spring 58 surrounds the axially slotted mandrel 56 and the link 52 so that they are on the inner end wall 43 with one end and inside lip 54 with the other end permanently prestressed. The spring 58 protects the Links 52, 56 before too large expansion and can also be in one piece with the links 38, 53, 54, 55, 56, 57 made of plastic or Like. Be trained. This allows the donor to only have four Components 4, 5, 7, 53 exist.

Downstream of lip 55, body 53 faces one the lip 55 slimmer mandrel 38, which in the direction of flow protrudes freely within the jacket 39 and at the end merges into an even slimmer mandrel or end section 57, which forms the movable closing surface of the valve 19. This ring-shaped closing surface is sharp-angled as an edge from the cylindrical peripheral surface and the flat end surface flanked by the mandrel 57. The movable closing surface is in Closed position only in a linear shape on the valve seat, the through the inner surface of the end wall of the head 7 is formed.

The sections 54 to 57 are axially fixed to each other connected and can be made in one piece with the valve body 53 be trained. The flow path of the medium penetrates the Valve body 53 axially and inside the lip 55 then exits radially into the interior of lip 55 from where it is further along the outer circumference of the mandrel 38 to the valve seat leads. This section of the flow path is from the outer circumference of the mandrel 38 and limited by the inner circumference of the jacket 39. Immediately upstream of the valve seat can a flow calming or a swirl or Vortex device with a calming or swirl chamber be provided. This device demonstrates radially inside leading channels leading into the central chamber on which like the chamber from the annular face of the mandrel 38, the circumference of the mandrel 57, the jacket 39 and the inside of the end wall of the head 7 are limited. By the swirl device can atomize the medium can be reached at the exit from the opening 15. For the Discharge in the form of drops is in place of the swirl chamber Calming chamber provided, which is opposite the upstream and downstream channel sections has much larger passage cross sections. For enlargement the chamber only needs to extend the mandrel 57 or the mandrel 38 can be shortened. After removing the head 7 in the direction of flow the bodies 46, 53 are freely accessible.

For securing the units 2, 3 or the body 4, 5 and also to secure them against each other Axial separation means 60 are provided, the securing members on the jackets 23, 34 and 31 directly are arranged. This keeps the rotational position of the Unit 3 is always the same compared to the memory 6, and it is only by means of this fuse 60 positively prevented that the unit 3 is subtracted from the unit 2 in the direction of flow can be. Against pulling off the head 7 of units 2, 3, only connection 41 secures form-fitting. The head 7 can therefore by the unit 3 through axial pulling off completely, e.g. to get through the Cylinder 16 to fill the reservoir 6 with medium.

The piston 18 has a single one, free in the direction of flow protruding, annular piston lip 62, which seals runs on the inner circumference of the cylinder 16, in the starting position but lifted from this inner circumference without contact is because the inner circumference ends up counter to the flow direction is widened at an acute angle. Within and over the Piston lip 62 is cylindrical in the direction of flow Mandrel 63 of the unit 17 freely in front, which with its outer circumference the media rooms 12, 13 delimited and downstream lying end of the stop member 43 and the reduced Carrier 49 carries. The driver 49 stands from the end face 47 of the mandrel 63 with a slimmer mandrel section free in front, which at the end has an enlarged, conical head has as a coupling member 51. Parts 18, 27, 43, 63, 49, 51 are axially fixed together and can be formed in one piece with each other. Parts 43, 63 go from surface 47 to lip 62 with constant Outside cross sections through.

Forms at the transition between the piston 18 and the body 27 the unit 17 a ring shoulder, which in the level of Inside of the wall 22 lies and the extended end of the annular portion of the channel 11 and 11a partially covers, so that a narrow or throttling point is formed here is. 3, the tube 24 forms here in the direction of flow funnel end 61 extended at an acute angle, opposite which the unit 17 can be non-contact. That upstream lying end of the piston 18 can also at least one of the bodies 4, 22, 24, 25, 32 with snap members be attached, which are distributed over its circumference and which Inlet opening 45 and ventilation opening 69 in wall 22 limit. The piston 18 can also be made in one piece with the Coat 32 may be formed.

Through the annular lip 62 and the inner circumference of the cylinder 16 an inlet valve 64 is formed, which in the starting position open and closed after a first partial stroke of the working stroke is because then the lip 62 on the conical Section of the cylinder 16 accumulates. Closes upstream an annular suction chamber 65 on this valve seat, which is limited by the piston 18 and the jacket 32. The Pre-suction chamber 65 passes through with its inlet end 45 as that Sheath 32 the end wall 22 and closes immediately upstream to the annular end of the channel 11 or 11a. After closing the valve 64, the Medium in chamber 12 to the control room within the Lip 55 compressed. So is when a limit pressure is exceeded the valve body 53 is displaced against the spring 58 and discharged the medium through the open valve 19 until the mechanically or manually positively actuated valve 37 on End of stroke closes.

The free end of the jacket 16 forms an opposite flow direction freely protruding, ring-shaped piston or sealing lip 66, which slides on the inner circumference of the jacket 32 and with the inner circumference of the chamber 65 is limited. The sealing lip 66 is permanently upstream of the piston lip 62. The sealing pressure or expansion of the lips 54, 55, 62, 66 takes along increasing media pressure within media rooms 11 to 14 to, so that a high tightness is guaranteed. The Sealing lip 66 is formed in one piece with the jacket 16.

The jacket 35 could also have a similar sealing lip have sealed guide on the inner circumference of the jacket 33. The coats 33, 35 also overlap like the coats 34, 31 each other permanently.

To form ventilation means 70 for the memory 6 can between the coats 33, 35 but also air in the annular space between the coats 32, 33 and from there through the opening 69 or the wall 22 and the seal 25 in the memory 6 are supplied, the jackets 33, 35 in the starting position form a tight seal for this ventilation path can. The closure can be a valve which is only available in Starting position closed and at all other stroke positions is open, each with a valve member in one piece with the Jacket 33 and the other valve member in one piece with the jacket 35 is formed. The actuation stroke is in the ring-shaped Space between the coats 16, 32, 33, 35 the pressure slightly increases, resulting in an acting in the memory 6 Pump effect results. The opening 69 closes the outer circumference of the jacket 32.

The body 4 has on the outer circumference of the jackets 23, 34 and the Wall 22 on at least one radially projecting cam 67. The body 5 has in the jacket 31 distributed over the circumference Openings or windows 68, which from the wall 29 to close to the open cap end of cap 28 and the wall 29 Push through in a slit shape. One engages in each opening 68 the cam 67 a. This is a resilient snap connection with snap members 67, 68 which are displaceable relative to one another formed to connect the two bodies 4, 5. The snap connection forms the fuse 60 at the same time, since the Cam 67 at the end of the return stroke on the upstream Limit of the window 68 strikes. The opposite of the Axis 9 fixed cam 67 has an oblique shoulder, which runs up at the end of the cap of the body 5, spreads the jacket 31 resiliently and then into the opening 68 jumps. Components 5 to 7, 16 to 18, 21 to 24, 26 to 29, 31 to 39, 42 to 49, 53, 56, 57, 61, 63 and 67 own or be dimensionally stable. The head 7 stands over the wall 29 a length that is at least as large as its outside diameter or is several times larger.

The seal 41 closes with the free end faces of the Projections 37, 38 flush. Should the ventilation air for the Storage 6 are germ-free, so are filter media or germicidal Appropriately in the ventilation path or in the annulus arranged tightly between the coats 32, 33. E.g. can a flat disc or ring-shaped germ filter 71 radially braced on the coats 32, 33 and on the face of the Outside of the wall 22 abut, which following the Outside of the jacket 32 as well as the seal 25 from the Ventilation opening 69 is penetrated in the plane of the Wall 22 opens into the storage space and from link 71 is covered. The filter 71 is e.g. a membrane filter and can be semi-permeable or so designed that it is like a Seal no medium from the memory 6 passes.

All specified properties and effects can be precise or only essentially or approximately as described be provided and depending on the medium to be discharged also strong deviate from it. Partial body that as one piece with each other trained can also be described by separate Components formed and in their mutual transition or Connection area connected to one another with connecting links be, e.g. through a welded connection, a snap connection or the like. With the discharge device can also smallest dosing quantities, e.g. 5 µl are discharged exactly.

To incorporate the features and effects into the invention is on DE-PS 33 39 180, DE-OS 44 41 263, the German patent application 196 06 703.0, the German patent application 196 10 457.2 and the German utility model 296 22 983.0. The donor according to the invention, its memory 6 or rigid storage space limitation only a single storage opening, namely that for attaching the Unit 2, and has no trailing piston, can be used alone by adding the tube 24 to upright operation outlet 15 lying above the reservoir 6 can be switched over, because then the medium from the bottom area of the storage through the channel 11 is sucked directly into the chamber 65.

Claims (14)

Dispenser for media with a discharge operation, thereby characterized in that the discharge or the Dispenser (1) two manually movable first and second dispenser units (2, 3) with first or comprises second base bodies (4, 5) and an actuating stroke defined with a stroke direction and a stroke, that media rooms, such as a pressure chamber (12) a pressure chamber boundary (16) and an outlet channel (14) with a media outlet (15), are provided that especially for changing the volume of the pressure chamber (12) the boundary (16) together with the media outlet (15) by means of the discharge actuation in relation to a displacement body (18) at least partially over the actuation stroke is movable, or that completely within the second dispenser unit (3) e.g. linearly movable Guide body (53) is arranged for the medium. Dispenser according to claim 1, characterized in that upstream directly at the media outlet (15) then the outlet channel (14) from the pressure chamber (12) separating closure, such as a valve (19) with an inherently rigid, movable closure surface is provided is that in particular the closure surface Ring edge is in the direction of flow against the Inside of a wall penetrated by the media outlet (15) of the second base body (5) can be put on and that preferably the closure surface in the direction of flow is spring loaded. Dispenser according to claim 1 or 2, characterized in that that within the second base body (5) on this one leading projection protruding freely in the direction of flow (46) is provided, which is within a dimensionally stable Mantels (39) lies that in particular the lead projection (46) a narrowed and downstream at a distance from the Stroke of the displacer (18) connecting longitudinal section the pressure chamber (12) limits and that preferably the lead projection as a jacket projection (46) sealed guidance of the valve body (53) Guide body and / or for centering a spring (58) is provided. Dispenser according to one of the preceding claims, characterized characterized in that the media outlet (15) one of a handle (36) of the second base body (5) freely protruding, exposed and rigid exhaust port (7) interspersed, with a radial distance at least one inner body delimiting the media spaces, like the guide projection (46), the guide body (53) o. Like., Is that in particular the outlet port (7) through a separate, opposite the actuation stroke the base body (5) fixed component is formed and that preferably in the direction of flow essentially steadily tapered outlet connection (7) Flow direction used in the base body (5) and with a rotation lock, like a positive one Snap bracket (41) is attached. Dispenser according to one of the preceding claims, characterized characterized in that the donor units (2, 3) aeration means (70) for automatic ventilation of a Media storage (6) include that in particular a Connecting the outside atmosphere with the media store (6) Ventilation channel of means (40, 71) against intrusion active germs in the media memory (6) limited and that preferably the ventilation duct is opposite the displacer (18) fixed germ filter (71) enforced. Dispenser according to one of the preceding claims, characterized characterized in that the first donor unit (2) a Career for sealed guidance of the pressure chamber boundary (16), via which the second donor unit (3) permanent against the direction of flow presides that in particular the career by one of an end wall (22) protruding freely in the direction of flow Guide jacket (32) formed and the first Basic body (4) from one of a seal (71) covered opening (69) is penetrated and that preferably the semipermeable seal on the outer circumference of the Guide jacket (32) and / or the germ filter (71) forms. Dispenser according to one of the preceding claims, characterized characterized in that the displacer (18) Thrust piston with a sealing lip (62) over which in Direction of flow a guide projection (63) protrudes that in particular one provided on the displacer (18) Stroke stop (47) to limit the stroke separately from the Sealing lip (62) is provided and that preferably the Stroke stop (47) downstream of the sealing lip (62) on Guide approach (63) or the like is provided. Dispenser according to one of the preceding claims, characterized characterized in that the displacer (18) over its Length is approximately axially symmetrical that in particular the displacement body (18) with an extension (27) protrudes into the memory (6) and that preferably the displacer (18) by one of the first Base body (4) separate component is formed, the is secured by holding members, which on the displacer (18) and on the first base body (4) are. Dispenser according to one of the preceding claims, characterized characterized in that at least one of the base bodies (4, 5) three in the starting position in the other body (5, 4) engaging, inherently rigid and mutually radial has spaced jackets (32, 33, 34 or 16, 35, 31), that especially outside the four inner ones Coats (32, 33, 16, 35) of the two base bodies (4, 5) a spring (59) is arranged and that preferably two middle jackets (33, 35) radially outside the pressure chamber (12) limit a low pressure chamber. Dispenser according to one of the preceding claims, characterized characterized in that a fuse (60) against twisting the donor units (2, 3) is provided that in particular a fuse (60) against pulling the Dispenser units (2, 3) are provided and one on the first Basic body (4) provided securing member (67) upstream at a distance from the free end of the outer Jacket (33, 34) of the first base body (4) and that preferably the securing member (67) approximately in the Level of the end wall (22) of the first base body (4) lies. Dispenser according to the preamble of claim 1, characterized characterized in that an outlet valve (19) with a mandrel-shaped, movable valve body (38, 57) is provided which is permanently connected to the pressure chamber (12) wired, directly to the valve seat adjoining calming chamber for calming the flow of the medium limited and / or with a mechanical attacking driver (49) can be moved into the open position is. Dispenser according to claim 11, characterized in that the driver (49) with the valve body (38, 57) a snap coupling (50) can be connected, in particular the driver (49) has an enlarged flow direction freely projecting coupling head (51) of the Has snap coupling (50) and that preferably that downstream coupling member (52) of the snap coupling (50) a narrowed channel section of the pressure chamber (12) limited. Dispenser according to the preamble of claim 1, characterized characterized in that to connect the dispenser (1) with a media store (6) in the first base body (4) a separate component (30) with a fastening member (26) for the intervention in the memory (6) and with a Securing member (26a) for axially positive connection with the first base body (4) is provided. Dispenser according to claim 13, characterized in that the component (30) has a cap for gripping over one Storage neck of the media store (6) has that in particular the component (30) comprises a riser pipe (24) and that preferably the fastening member (26) on Inner circumference and the securing member (26a) on the outer circumference the cap jacket (23) of the component (30) is provided is.

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