EP1815914A1 - Metering device with lock - Google Patents

Abstract

The device has a pump (5) that can be operated with a pumping movement (18) to transport the medium and an associated dosing head (1) with an actuator (10) that is movably coupled to the pump to initiate the pumping movement. At least one section of the dosing head, especially the actuator, has an integrated dosing channel (11) for transporting the medium from the pump to a dosing opening (12) and is movable between a rest position and an operating position to lock or release the actuator for the pumping movement.

Description

The invention relates to a metering device for manual, in particular one-handed metering of a medium, with a pumping device which is operable for conveying the medium by means of a pumping movement and which is associated with a dosing, having an actuating device which is movable to initiate the pumping movement with the pumping device is coupled.

From the DE 101 34 796 A1 a discharge device for a medium is known, which has an actuatable for a discharge dosing and a carrier unit which is associated with the dosing. The carrier unit can be fastened to an outlet region of a storage container for the medium. The dosing is locked by two in the form of locking tabs on opposite sides of a security part locking means in a blocking position and not operable in this position. For this purpose, the locking tabs in the region of an inner end edge each have a locking cam on, on the dosing each associated with a corresponding locking recess.

The object of the invention is to provide a metering device which realizes a simple, reliable and easy to handle against unwanted use.

This object is achieved by a metering device of the type mentioned, in which at least a portion of the metering head, in particular the actuating device, an integrated metering channel for transporting the pumped medium from the pumping device to a metering and between a rest position and a functional position is movable to to cause a blocking or release of the actuator for the pumping movement.

The dosing head can have a plurality of mutually relatively movable sections. Typically, at least a portion of the dosing head is rigidly connected to the pumping device or to a medium reservoir and thereby allows a guide, in particular a sliding and / or rotating guide, at least one further, relatively movable portion of the dosing head. This further section may in particular be designed as an actuating device for the pump device and serve as a finger rest for one or more fingers of a user. By means of the finger rest, a compressive force can be applied to the actuating device and thus to the pumping device in order to cause a pumping movement. The pump device can be designed in particular as a piston pump and allows the promotion of a predeterminable amount of the medium.

In a relatively movable executed section of the dosing a Dosierkanal, that is a preferably elongated, at least in each case open end cavity is provided, of an outlet opening the pumping device extends to a metering opening. The outlet opening of the pumping device is provided for an ejection, that is to say a delivery of a quantity of medium conveyed when a pumping movement is carried out. The metering opening is provided for delivery of the conveyed medium amount to an environment. The medium channel and the metering opening may be adapted to a viscosity of the medium in terms of a profile cross-section and an opening cross-section, in order to enable a reproducible medium metering. In this case, the profile cross-section of the metering channel is designed in the manner of a capillary and the metering opening is designed in particular as a narrowed nozzle opening with a nozzle profile for atomizing the medium or for delivering the medium in a spray jet. The medium may in particular be a higher-viscosity, gel-like or cream-like cosmetic or pharmaceutical substance which is metered in the manner of a paste or cream strand, such as from a toothpaste tube or a cream tube. For this case, the profile cross-section of the metering channel is preferably selected to be cylindrical and the metering orifice has at most a slight widening towards the outlet. The metering channel can be realized in one piece in a section of the metering head, a multi-part design of the metering channel, for example with a nozzle insert adapted to the medium in the region of the metering opening and / or with a plurality of metering channel sections is also conceivable. The medium may also be an aqueous solution of one or more pharmaceutical substances.

Due to the mobility of at least one section of the dosing head relative to other sections of the dosing head between the rest position and the functional position, the blocking or release of the actuating device is effected. In a blocking of the actuator can despite initiation of an actuating force, for example on the finger rest, no pumping movement or at least only a small pumping movement, which does not lead to any relevant medium leads to be caused. This can be avoided during transport of the metering that medium exits through an unwanted introduction of force on the metering device and possibly leads to contamination. An undesired introduction of force can occur, in particular, during transport of the metering device in a lady's handbag or a bag in which the metering device is transported together with other objects.

After a movement of the corresponding portion of the dosing from the rest position to the functional position, the introduction of an actuating force on the actuator leads to a pumping operation and thus to a medium dosage. In a preferred embodiment of the invention, it is provided that, in addition to the mobility in the direction of the pumping movement, the actuating device also has a further degree of freedom of movement in order to be able to assume a rest position or a functional position. This allows a one-handed operation of the metering device, since the actuator can be transferred by applying an unlocking force from the rest position to the functional position. Subsequently, an actuating force can be applied to the actuating device to perform a pumping stroke and to convey medium from a medium reservoir through the pumping device and the metering channel into an environment. After performing the pumping movement, the actuating device can be brought in a compressed or in an expanded position of the pumping device by applying a locking force in the rest position, so that an unintentional actuation of the metering device has no medium discharge result.

In an embodiment of the invention it is provided that the at least one portion of the dosing head, in particular the actuating device, along a movement path linearly movable between the rest position and the functional position is displaceable, wherein the movement path is aligned non-parallel, in particular orthogonal, to the pumping movement axis. By a displacement of the actuating device along a movement path, a convenient transfer of the actuating device from the rest position to the functional position and back can be achieved. A trajectory describes a rectilinear or curvilinear movement of the actuating device between the rest position and the functional position and can be realized in particular by a sliding guide or a sliding guide of the actuating device relative to a further portion of the dosing head or the pumping device. The movement path is not aligned parallel to the pumping movement axis, so that a decoupling between the movement for unlocking and locking the actuating element and the pumping movement is ensured. Thus, inadvertent actuation of the pumping device can be prevented. In the case of a curved trajectory, it is provided that at least one track section in the region of the rest position of the actuating device is aligned non-parallel to the pumping movement axis. In a preferred embodiment of the invention, it is provided that the entire movement path is aligned at least substantially orthogonally to the pumping movement axis, so that a decoupling between the locking and unlocking movement for the actuating device and the pumping movement which is easy to understand for an operator is realized. For example, the pumping movement axis can be aligned in parallel, in particular coaxially to a central longitudinal axis of the metering device, while the movement path for the actuating element is oriented orthogonally to the central longitudinal axis.

In a further embodiment of the invention, it is provided that the at least one section of the dosing head, in particular the actuating device, pivotably about a pivot axis, in particular orthogonal to the pumping movement axis between the rest position and the functional position is movable. With a pivoting movement, an easy to be performed locking and unlocking the actuator can be realized. The pivot axis of the actuating device may preferably be oriented orthogonally to the pumping movement axis. For locking and unlocking of the actuating device, a tilting about the pivot axis is provided, which in the case of unlocking a pumping movement in the orthogonal direction to the pivot axis follows. By a schenkbewegbare actuator also a clear visual and haptic, so good to see and easy to feel distinction between the locked and the unlocked position of the actuator can be realized because the actuator can be designed so that it protrudes obliquely in the functional position of the dosing and thus signaling readiness for operation. In one embodiment of the invention, the actuating device is pivotable both along a movement path and about at least one pivot axis, so that in the release position, an individual adjustment of the position of the metering opening relative to the other metering device can be selected.

In a further embodiment of the invention, it is provided that the metering channel is designed to be telescopic in order to allow a displacement of the metering opening along the path of movement. By displacing the metering opening, a compact design of the metering device can be realized in the inoperative position, while the metering device preferably provided in the actuating device projects in the functional position from the metering device in the manner of a beak or snout. This results in significant advantages in automated operations such as in particular the filling or assembly of the dosing. This is a recording of a particular high-viscosity, so cream or paste-like medium, as a compact and in particular contiguous medium strand of the Dispensing is dispensed, for example, on a palm, relieved. To ensure that the medium despite the displacement of the metering can be transported without interruption of the metering from the pumping device to the metering, the metering is telescopic, so variable in length and thus allows a relative movement of the metering relative to the pumping device. For this purpose, the metering channel can be provided, for example, with a flexible element, in particular with an elastic channel section or a bellows-shaped channel section, whereby a change in length is made possible by elastic deformation.

In a further embodiment of the invention, it is provided that the metering channel has a first and at least one second Dosierkanalabschnitt, wherein the second Dosierkanalabschnitt is received at least partially slidingly movable in the first Dosierkanalabschnitt. By means of an at least two-part design of the metering channel with coordinated metering channel sections which can be pushed into one another, a metering channel which can be produced in particular in plastic injection molding technology and is easy to install can be realized. The Dosierkanalabschnitte may in particular have a round or polygonal cross-section, wherein an outer contour of a Dosierkanalabschnitts is adapted to an inner contour of the other Dosierkanalabschnitts so that the Dosierkanalabschnitte telescopically and in particular medium can be pushed into each other. This allows the displacement of the metering and the change in length of the metering over a range of several millimeters to centimeters.

In a further embodiment of the invention it is provided that between the first and the second Dosierkanalabschnitt a sealing device is formed, which arranged for a seal of the slide-movable Dosierkanalabschnitte is provided for preventing a medium outlet between the Dosierkanabschnitten. In order to avoid that between the coordinated Dosierkanalabschnitten a high friction occurs, which could lead to an uncomfortable operation of the actuator, a sealing device is provided between the Dosierkanalabschnitten. The sealing device allows a local sealing of the Dosierkanalabschnitte and thus ensures a low friction between the Dosierkanalabschnitten. The sealing device can be designed as a separate component, for example as an O-ring, which is received in an inwardly or outwardly facing groove of a Dosierkanalabschnitts and can slide with a particular annular, sealingly acting contact line on a substantially smooth surface of the corresponding Dosierkanalabschnitts , In a preferred embodiment of the invention, the sealing device is designed as an integrally formed on a Dosierkanalabschnitt, circumferential, in particular ring-like sealing edge or sealing lip, which can be formed during the preparation of the Dosierkanalabschnitts with and thus requires no assembly work.

In a further embodiment of the invention it is provided that the at least one portion of the dosing head, in particular the actuating device, locking means are assigned, which are designed to prevent inadvertent pumping movement in the rest position. The locking means allow the recording of operating forces that may occur in an unintentional actuation of the metering device and that could otherwise lead to an unwanted medium discharge. The locking means are provided on the dosing that they prevent force in the rest position of the actuator on the pumping device and cause a closed power flow between the actuator, the dosing and possibly a medium storage. This comes there is no relevant relative movement of the actuating device in the direction of the pumping movement axis. The locking means may be provided for a linearly movable, for a pivotable or for a linear and pivotable actuator and in the functional position allow movement of the actuator along a movement path or about a movement axis, while in the rest position blocking of the actuator is ensured.

In a further embodiment of the invention, it is provided that the locking means are designed as a closure means for the metering channel to cause a blocking effect for the actuating device as a hydraulic shut-off valve. With an embodiment of the locking device as a hydraulic check valve, a double function of the locking means can be realized. By blocking, that is by sealing the metering channel, an actuation of the pumping device is already prevented by the incompressibility of the medium. In the case of a blocked metering channel, the medium enclosed in the pumping device and in the blocked region of the metering channel, which typically can not be compressed, can not escape despite an increase in internal pressure due to external actuating forces and thus prevents the medium from being discharged from the pumping device into the medium channel. The locking means thus fulfill the blocking function for the actuator and prevent unwanted medium discharge in the presence of external forces on the actuator. In addition, due to the blocking of the metering channel in the rest position, leakage or outflow of medium remaining in the metering channel is reduced or prevented so that contamination of an outer surface of the metering device or an environment of the metering device can be avoided.

In a further embodiment of the invention, it is provided that the hydraulic shut-off valve is formed between the first and the second Dosierkanalabschnitt and is provided for blocking the Dosierkanals in the rest position. The hydraulic check valve is provided for a closure of the metering channel to prevent unwanted leakage of medium from the metering channel. Preferably, the hydraulic check valve is designed as an axially or radially acting valve, in particular as an axially acting conical valve or as a radially acting slide valve and is driven by the substantially linear movement of the actuator. In the case of an axially acting valve, the metering channel is blocked in its longitudinal extension during the transition from the functional position to the rest position. In the case of a radially acting valve, the axial movement of the actuating device into the rest position results in the blockage of a channel section projecting essentially orthogonally from the metering channel, which can be provided, for example, for connection to the pumping device or the metering opening. It is preferably provided in the case of a radial valve that the telescoping metering channel sections are moved linearly relative to one another and thereby an opening in a wall region of the first metering channel section can be closed or released by the second metering channel section, for example provided with a continuous wall. A radial valve can also be controlled by a pivoting movement of the actuator. An axially acting valve can be made more compact, while with a radially acting valve, a longer actuation travel can be realized with low valve forces and a simpler seal.

In a further embodiment of the invention, it is provided that the locking means are designed for a pivotable actuating device as a blocking arm, which is aligned in the rest position at least almost parallel to a Pumpbewegungsachse and a corresponding Support surface is assigned to block a pumping movement. By means of the blocking arm, the greatest possible distance, that is to say a large lever arm between the pivot axis and the bearing surface provided in particular on the dosing head, can be realized for an advantageous operation of the locking device, so that a release of the locking means and thus a feasibility is achieved even with a small pivoting movement of the actuating device the pumping movement is ensured. The blocking arm may in particular be provided on the actuating device in such a way that, upon pivotal movement of the actuating device from the rest position into the functional position, it is pivoted out of an inner wall region of the dosing head in the direction of the central longitudinal axis of the dosing head. With such an arrangement of the blocking arm ensures that when exercising an actuating force at befindlichem in rest position actuator self-locking is ensured by the blocking arm, which can only be lifted by a targeted pivotal movement of the actuator about the pivot axis.

In a further embodiment of the invention, it is provided that the metering channel is arranged in the pivotable actuating device such that in the functional position there is a communicating connection between the pumping device and metering opening, and that the metering channel is closed in the rest position. Thus, a double protection against unwanted medium discharge can be realized, provided that the actuator is also provided with a blocking arm. The pivoting actuator is thus blocked in the rest position both hydraulically and mechanically.

In a further embodiment of the invention, it is provided that the locking means for a forced movement of the actuating device against a pump actuating direction are designed so that in the rest position, a discharge of the pumping device and / or a closure of a ventilation duct for a medium storage is ensured. The pumping operation direction identifies that direction of movement along the pumping movement axis in which a medium discharge can be caused by the pumping movement. In the rest position not only a medium discharge is to be prevented by the pumping device, but in addition to ensure that the medium present in the pumping device and in the metering is under the lowest possible pressure. As a result, a continuous load of the sealing devices can be reduced and unwanted escape of the medium can be prevented. For this purpose, the actuating device is forcibly moved against the pump actuating direction when the rest position is taken along the movement path and / or during the pivoting movement by the locking means. Thus, a volume of a pumping device provided in the pumping chamber can be increased, which leads to a reduction of an internal pressure in the pumping device and thus to the desired pressure relief. Alternatively or additionally, by means of this forced movement, a ventilation channel provided for the ventilation of the pumping device can also be closed. The ventilation channel allows in particular during return of the pumping device against the pump actuating direction ventilation of the medium reservoir. This ventilation is provided to ensure a balance of the extracted by the pumping device from the medium reservoir media volume. The closure of the ventilation channel in the rest position of the movement device, an escape of gaseous, especially evaporated media components during disuse of the metering device can be prevented. This can be ensured in a simple manner, a long-term stability and a constant concentration of the active ingredients contained in the medium.

In a further embodiment of the invention it is provided that the locking means is associated with a guide, which are designed for a superposition of a forced movement of the actuating device against the pump actuating direction when taking the rest position along the path of movement. By means of a guide, which may also be designed as a substantially oblique or curved surface, the actuating device is forcibly moved in the manner of a wedge when taking the rest position against the pumping operation. Thus, the desired relief of the pumping device and the closure of the medium channel can be effected. Advantageously, this management tolerances such as height tolerances or the like can be compensated.

In a further embodiment of the invention, it is provided that a production of the dosing head is provided in multi-component injection molding, wherein each other relatively movable components can be produced in successive operations. With the multicomponent injection molding process, the different sections of the dosing head, including the movable actuating device, can be manufactured in a single injection mold in a sequence of several injection molding processes, without any subsequent assembly work to be carried out. For multicomponent injection molding it is provided that initially a first section of the dosing head is produced with a preferably higher-melting plastic material in the injection mold. Subsequently, a second portion of the dosing is made with a preferably lower melting material, that is, a plastic material with a lower melting point in the same injection mold after actuation of one or more mold slides. Further injection molding operations, each with lower melting plastic materials can be provided. Also conceivable is the production of elastic sealing devices which are molded directly onto the sections of the dosing head formed of a harder plastic material.

In a further embodiment of the invention, it is provided that the dosing is assigned a particular arranged on the actuator return suction, so that in the rest position of the actuator, a medium surplus in the dosing can be avoided. By means of the return suction device, the medium received in the metering channel can be at least partially withdrawn from the metering opening during the transfer of the actuating device from the functional position to the rest position, so that leakage of medium in the rest position can be avoided, since the medium is at least partially discharged from the metering opening a storage chamber of the Rücksaugeinrichtung is sucked. This is of particular interest in a medium which poses a danger of contamination or dehydration for the metering device and its surroundings, as may be the case, for example, with creams or gels. The back suction device is used in particular in a telescoping dosing channel whose channel volume is reduced during the transfer to the rest position by the telescopic operation, whereby the recorded medium in the dosing would escape through the dosing. The back suction prevents this leakage by at least the volume difference between the telescoped and the retracted dosing is sucked by a negative pressure in the Rücksaugeinrichtung.

In a further embodiment of the invention it is provided that the Rücksauginrichtung is designed as a piston pump with a cylinder and a piston for the return suction of medium, wherein the piston is controlled by a movement of the actuating device along the movement path. In order for an effective and easy to build back suction device can be realized. With suitable dimensioning the Rücksaugeinrichtung allows the suction of a medium volume that is at least as large as the reduction in volume of the telescopic dosing channel during the transfer from the functional position to the rest position. Preferably, the back suction device can suck in a medium volume which is greater than the volume reduction of the dosing channel caused by the telescoping, so that the medium remaining in the medium channel is withdrawn from the dosing opening and can not lead to contamination. When transferring the actuating device from the rest position to the functional position, the medium is ejected from the rear-suction device and pushed in the direction of the metering opening, so that during a pumping movement the medium can be discharged directly from the metering opening.

Fig. 1

einen Dosierkopf mit einer linearbeweglichen Betätigungseinrichtung und einem radialen Ventil in einer Ruhestellung,

Fig. 2

den Dosierkopf der Fig. 1 in einer Funktionsstellung,

Fig. 3

eine weitere Ausführungsform eines Dosierkopfs in der Funktionsstellung,

Fig. 4

eine weitere Ausführungsform eines Dosierkopfs mit einem axialen Ventil in der Funktionsstellung,

Fig. 5

eine weitere Ausführungsform eines Dosierkopfs mit einer schwenkbaren Betätigungseinrichtung und einem radialen Ventil in der Ruhestellung,

Fig. 6

den Dosierkopf gemäß der Fig. 5 in der Funktionsstellung,

Fig. 7

eine Abwandlung des Dosierkopfs gemäß der Fig. 5 und 6 mit einem Blockierarm in der Ruhestellung.

Further advantages and features emerge from the claims and the following description of preferred embodiments, which are illustrated with reference to the drawings. Showing:

Fig. 1

a dosing head with a linearly movable actuating device and a radial valve in a rest position,

Fig. 2

the dosing head of FIG. 1 in a functional position,

Fig. 3

a further embodiment of a dosing head in the functional position,

Fig. 4

a further embodiment of a dosing head with an axial valve in the functional position,

Fig. 5

a further embodiment of a dosing head with a pivotable actuator and a radial valve in the rest position,

Fig. 6

the dosing head according to FIG. 5 in the functional position,

Fig. 7

a modification of the dosing according to FIGS. 5 and 6 with a blocking arm in the rest position.

A dosing head 1 for a dosing device, not shown, has a first section designed as a sleeve-shaped housing 2 and a second section designed as an actuating device 3. The sleeve-shaped housing 2 encloses a screw cap 4, which is provided with an integrated pumping device 5 and which is provided for screwing onto a medium storage, not shown. The pumping device 5 is designed as a piston pump, not shown, and has an upwardly projecting, linear along a pumping movement axis 6 movable pump tappet 7. The pump plunger 7 has a concentrically arranged to a central longitudinal axis 22 of the pumping device 5, not shown outlet opening, which allows a discharge of conveyed medium from the pumping device 5. The pump plunger 7 is coupled to a pump piston, not shown, which is movably received in a pumping chamber of the pumping device 5. On the pump plunger 7, a first Dosierkanalabschnitt 8 is attached, which is shown in section and which is designed substantially as a T-piece of pipe. In the first Dosierkanalabschnitt 8 a second, tubular shaped Dosierkanalabschnitt 9 is slidably received, which is integrally connected to a designed as a finger pad 10 actuator. On an outer surface of the finger rest 10 of the Dosierkanalabschnitten 8, 9 limited metering channel 11 opens into a metering opening 12, which is designed in this case cylindrical.

The metering channel sections 8, 9 are matched to one another in such a way that they can be displaced in a slidingly displaceable manner relative to each other in a sliding manner. In order to achieve a seal between the metering channel sections 8, 9, the outer contour of the second metering channel section 9 matched to the inner contour of the Dosierkanalabschnitts 8 such that touch the Dosierkanalabschnitte on a non-illustrated circumferential contact line. Thus, the medium can only slightly into a gap between the Dosierkanalabschnitten 8, 9 occur and penetrate only to the line of contact. In addition, circumferential sealing means D, in particular at least one circumferential, integrally molded sealing ring, between the Dosierkanalabschnitten 8 and 9 are provided.

For a blocking of the metering channel 11 in the rest position according to FIG. 1, a connecting bore 13 is mounted in a wall region of the second metering channel section 9 such that it is closed in the rest position by a wall section of the first metering channel section. In the functional position shown in FIG. 2, the connecting bore 13 is arranged opposite the first metering channel section 8 such that a communicating connection between the outlet opening and the metering opening 12 is realized. Thus, the two Dosierkanalabschnitte 8 and 9 form a listed as a radial valve hydraulic check valve, which can be controlled by a linear displacement of Dosierkanalabschnitte 8, 9 to each other. The design of the metering channel sections 8, 9 according to FIGS. 1, 2 and 3 is a first embodiment of a metering channel 11 in which, despite a relative movement of the metering channel sections 8, 9, no change in volume occurs in the metering channel 11. Thus, in this embodiment, the problem of unwanted medium discharge when transferring the finger rest 10 from the functional position in the rest position greatly reduced or not available. A variable volume telescoping metering channel 11 will be described below for the embodiment shown in FIG.

A blocking of the finger rest 10 against an unwanted pumping movement is in addition to the hydraulic locking function by the radial valve in the dosing head 1 according to FIGS. 1 and 2 by the after below projecting front and rear tongues 14, 15 ensures that rest in the rest position on support surfaces 16, 17 of the first portion of the dosing head 1 and thereby prevent movement of the finger rest 10 in the direction of the pumping device 5. Due to the linear displacement of the finger rest 10 between the rest position according to FIG. 1 and the functional position according to FIG. 2, the tongues 14, 15 are also removed from the bearing surfaces 16, 17 and thus allow a pumping movement. The pumping movement takes place along the pumping movement axis 6 in the pumping movement direction 18 and leads to a metering of the medium from the pumping device 5 in the metering 11 and the metering port 12. The pumping device 5 is provided with a return spring, not shown, the finger pad 10 in the in Fig. 2 illustrated initial position resets and thus also allows a purely translational displacement of the actuator back to the rest position.

In the linear displacement of the finger rest 10 between the rest position and the functional position shown in FIGS. 1 and 2, which can also be described as movement along a substantially rectilinear trajectory 29, an additional, designed as a control link 19 guide device is driven. The control link 19, which is shown in the detail enlargements A and B of FIGS. 1 and 2 in the rest position and in the functional position, is connected to the finger rest 10 and is thus carried along by the movement along the path of movement. The control link 19 is disposed adjacent to a housing 2 attached to the support pin 20 and, depending on the position of the finger rest 10 with the support pin 20 in operative connection. The control link 19 is provided with an inclined surface 21, so a kind of slanted plane which is aligned at an angle to the movement path and the transfer of the finger rest 10 from the functional position to the rest position, a translational forced movement of the finger rest against the pumping direction 18th causes. Thus, the pump piston, not shown, in addition to a restoring force that can be exerted by a spring device, not shown, pulled up against the pumping direction 18, so that on the one hand, a volume of the pumping chamber is increased and a pressure relief of the recorded in the pumping chamber medium takes place. On the other hand, can be closed by this movement and the pumping means 5 associated, not shown ventilation device to prevent escape of gaseous or nebulized media components during disuse of the metering device.

It can be provided in particular that the venting valve of the pump direction 5 is closed immediately at the beginning of the transfer of the finger rest 10 from the functional position to the rest position, that is, upon deactivation of the metering device. In this way, a negative pressure in the pump chamber can be built up by the subsequent forced movement of the finger rest 10 against the pump movement direction 18, which is accompanied by the enlargement of the volume enclosed by the pump chamber and the pump piston, caused by the control cam 19 and the support pin 20. The negative pressure leads to at least a slight recirculation of medium in the pumping chamber and thus prevents leakage of medium from the metering orifice 12 during or after deactivation of the metering device.

In the embodiment according to FIG. 3, which has the same reference numerals as the embodiment according to FIGS. 1 and 2 for functionally identical components, instead of the control link 19 in each case an inclined surface 21a at the front and rear tongues 14a, 15a and corresponding to provided the support surfaces 16a and 17a of the housing 2, so that the forced movement of the finger rest 10 alone is caused by the operative connection of the tongues 14a, 15a with the bearing surfaces 16a, 17a.

In the embodiment according to FIG. 4, which has the same reference numerals for the functionally identical components as the embodiments described above, the difference to the embodiments of FIGS. 1 to 3 lies in the design of the metering channel sections 8b, 9b. The Dosierkanalabschnitt 8b is designed substantially L-shaped and is provided with a diaphragm 23b, which is designed as a valve seat for an axial valve. The second metering channel section 9b has a sleeve-shaped configuration and is provided with a valve plug 24b at an end facing the first metering channel section 8b. The valve plug 24b is adapted to the diaphragm 23b in terms of its geometric configuration and can be sealingly received in the opening of the diaphragm 23b. On the side of the valve plug 24b, a through-opening 25b is provided, which ensures a communicating connection between the metering duct sections 8b and 9b and thus between the outlet opening and the metering opening 12 in the illustrated functional position. The axial valve formed by the diaphragm 23b and the valve plug 24b can be opened and closed by a linear movement of the finger pad 10 between the rest position and the functional position and acts as a hydraulic shut-off valve, which in the closed state due to the incompressibility of the medium actuation of the pumping device fifth can prevent.

In order to prevent unwanted medium discharge in the transfer of the finger rest 10 from the illustrated functional position to the rest position, which is accompanied by a reduction of the volume defined by the metering channel 11 b, a return suction device 26 shown only schematically in FIG. 4 can be provided. The back suction device 26b is a piston pump with a cylinder 27b and a piston 28b formed for Rücksaugung of medium. The cylinder 27b is connected in a manner not shown with the housing 2. The piston 28b is controllable by a movement of the finger rest 10 along the movement path 29 and increases a cylinder 27b and piston 28b enclosed volume in the transfer of the finger rest 10 from the functional position to the rest position. Since the cylinder 27b is connected to the metering channel 11b via a suction line 30b, a complete suction of the medium volume displaced by the telescoping of the metering channel can be effected with suitable dimensioning of the return suction device 26b.

In the embodiment according to FIGS. 5, 6 and 7, which have the same reference numerals as the embodiments described above for functionally identical components, the difference to the embodiments described above lies in the design of the finger rest 10c and the metering channel sections 8c and 9c. The finger rest 10c is pivotable about a pivot axis 31c projecting into the plane of representation and has a second metering channel section 9c designed in the manner of a spherical segment. The Dosierkanalabschnitt 9c is sealingly received in the first, designed as a ball socket Dosierkanalabschnitt 8c, wherein the pivot axis 31 c extends through centers of the Dosierkanalabschnitte 8c and 9c. The Dosierkanalabschnitt 9c is provided with a substantially L-shaped bore which is pivoted in the rest position according to FIG. 5 relative to the Dosierkanalabschnitt 8c such that a blockage of the metering channel 11 c is present. A beak-shaped end portion 32c of the Dosierkanalabschnitts 9c, on which the metering opening 12 is arranged, is in the rest position on a screw 4c associated web 33c, which serves as a locking device and prevents movement of the finger pad 10 in the pumping direction 18, as long as the finger rest 10 in that shown in Fig. 5 Rest position is located. By blocking the metering channel 11 c, a hydraulic blocking function is effected in addition to the mechanical blocking by the web 33 c.

By tilting the finger rest 10 c about the pivot axis 31 c of the dosing channel 11 c is released and provides a communicating connection between the pumping device 5 and the metering 12 safe. In addition, due to the pivoting movement, the end region 32c is removed from the web 33c, so that a blocking effect is released and a pumping movement along the pumping movement axis 6 becomes possible.

In the embodiment according to FIG. 7, an additional locking device designed as blocking arm 34 is provided. The blocking arm 34 c is attached to the second Dosierkanalabschnitt 9 c and projects obliquely inwards from the central longitudinal axis 22. On the housing 2, a radially inwardly projecting projection 35c is provided, which is provided for a power transmission from the finger pad 10 via the blocking arm 34c on the housing 2 and thus in the rest position shown in Fig. 7, a blocking of the pumping movement when external Ensures forces exerted in the pumping direction 18 ensures. The spacing and the oblique course of the blocking arm 34c relative to the projection 35c in the rest position is selected such that when the finger rest 10 is tilted about the pivot axis 31c, the blocking arm 34c does not touch the projection 35c and thus does not block the tilting.

Claims (16)

Dosing device for manual, in particular one-handed dosing of a medium, with a pumping device (5), which is operable for conveying the medium by means of a pumping movement (18) and a dosing head (1) is assigned, having an actuating device (10, 10c) , which is coupled to the pumping device (5) for the introduction of the pumping movement (18), characterized in that at least a portion of the dosing head (1), in particular the actuating device (10, 10c), an integrated dosing channel (11, 11 b, 11 c) for transporting the conveyed medium from the pumping device (5) to a metering orifice (12) and is movable between a rest position and a functional position to cause a blocking or release of the actuating device (10, 10c) for the pumping movement. Dosing device according to claim 1, characterized in that the at least one section of the dosing head (1), in particular the actuating device (10, 10c), along a movement path (29) is linearly movable between the rest position and the functional position, wherein the movement path (29) is aligned non-parallel, in particular orthogonal, to the Pumpbewegungsachse (6). Dosing device according to claim 1 or 2, characterized in that the at least one portion of the dosing head (1), in particular the actuating device (10, 10c), pivotally about a particular orthogonal to the pumping movement axis (6) aligned pivot axis (31 c) between the rest position and the functional position is movable. Dosing device according to claim 2 or 3, characterized in that the metering channel (11, 11 b, 11 c) is designed to be telescopic, in order to allow a displacement of the metering opening (12) along the movement path (29). Dosing device according to claim 4, characterized in that the dosing channel (11, 11 b, 11 c) has a first (8, 8 b, 8 c) and at least a second (9, 9 b, 9 c) Dosierkanalabschnitt, wherein the second Dosierkanalabschnitt (8, 8b, 8c) is at least partially slidably movable in the first Dosierkanalabschnitt (89, 9b, 9c) is added. Dosing device according to claim 5, characterized in that between the first (8, 8b, 8c) and the second (9, 9b, 9c) Dosierkanalabschnitt a sealing device is formed, which is suitable for sealing the sliding movably arranged Dosierkanalabschnitte (8, 8b, 8c, 9, 9b, 9c) for preventing a medium outlet between the Dosierkanalabschnitten (8, 8b, 8c, 9, 9b, 9c) is provided. Dosing device according to one of the preceding claims, characterized in that the at least one portion of the dosing head (1), in particular of the actuating device (10), locking means (13, 14, 14a, 15, 15a, 16, 16a, 17, 17a, 19, 20, 24b, 25b, 34c, 35c) which are designed to prevent inadvertent pumping movement in the rest position Dosing device according to one of the preceding claims, characterized in that the locking means as a closure means (13, 24b, 25b) for the metering channel (11, 11 b, 11 c) are designed to serve as a hydraulic shut-off valve are to cause as a hydraulic check valve, a blocking action for the actuator (10). Dosing device according to claim 8, characterized in that the hydraulic shut-off valve between the first (8, 8b, 8c) and the second (9, 9b, 9c) Dosierkanalabschnitt is formed and for blocking the Dosierkanals (11, 11 b, 11 c) is provided in the rest position. Dosing device according to claim 8, characterized in that the locking means for a pivotable actuating device (10c) as a blocking arm (34c) are executed, which is aligned in the rest position at least almost parallel to a Pumpbewegungsachse (6) and a corresponding bearing surface (35c) Blocking a pumping movement (6) is assigned. Dosing device according to claim 8 or 10, characterized in that the metering channel (11, 11 b, 11 c) is arranged in such a manner in the pivotable actuating device (10, 10 c), that in the functional position a communicating connection between pumping device (5) and metering ( 12) is present, and that the metering channel (11, 11 b, 11 c) is closed in the rest position. Dosing device according to claim 8, characterized in that the locking means (14a, 15a, 16a, 17a, 20, 21, 21 a) for a forced movement of the actuating device (10) are designed counter to a pump actuating direction (18), so that in the rest position a Relief of the pumping device (5) and / or a closure of a ventilation duct for a medium storage is ensured. Dosing device according to claim 12, characterized in that the locking means (14a, 15a, 16a, 17a, 20, 21, 21a) is associated with at least one guide, which is for a superposition of a forced movement of the actuating device (10) against the pumping operation direction (18). when taking the rest position along the path of movement (29) are designed. Dosing device according to one of the preceding claims, characterized in that a production of the dosing head (1) is provided in the multi-component injection molding, wherein each other relatively movable components can be produced in successive operations. Dosing device according to one of the preceding claims, characterized in that the dosing channel (11, 11 b, 11 c) is associated with a return device (26 b) arranged in particular on the actuating device (10, 10c), so that in the inoperative position of the actuating device (10, 10c) a medium surplus in the metering channel (11, 11b, 11c) can be avoided. Dosing device according to claim 15, characterized in that the Rücksauginrichtung is designed as a piston pump with a cylinder (27b) and a piston (28b) for the return suction of medium, wherein the piston (28b) by a movement of the actuating device (10, 10c) along the Movement path (29) is controllable.

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