DISCHARGE DEVICE WITH INTERMEDIATE PIECE

Abstract

A discharge device having an actuating handle, a first pump system for conveying a first medium and a second pump system for conveying a second medium. The actuating handle can be moved between an initial position and an end position. The first pump system includes a first pump chamber and a first piston arranged in a displaceable manner in the first pump chamber. The second pump system includes a second pump chamber and a second piston arranged in a displaceable manner in the second pump chamber. The first piston and the second piston can be displaced via the actuating handle in the direction of actuation, and the actuating handle and the first piston are coupled to each other such that the actuating handle and the first piston can be displaced relative to each other in a direction of actuation via a free travel.

Claims

1. A discharge device having an actuating handle, a first pump system for conveying a first medium and a second pump system for conveying a second medium, wherein the actuating handle is movable between a starting position and an end position, and wherein the first pump system and the second pump system are actuatable together by means of the actuating handle, wherein: the first pump system includes a first pump chamber and a first piston which is slidably arranged in the first pump chamber, wherein the first piston is displaceable in an actuating direction by means of the actuating handle relative to the first pump chamber, the second pump system includes a second pump chamber and a second piston which is slidably arranged in the second pump chamber, wherein the second piston is displaceable in an actuating direction by means of the actuating handle relative to the second pump chamber, the actuating handle and the first piston are coupled together in such a manner that the actuating handle and the first piston are displaceable relative to one another in the actuating direction over a first free travel, wherein the distance between the starting position and the end position is greater than the first free travel.

2. The discharge device as claimed in claim 1, wherein the actuating handle and the second piston are coupled together in such a manner that the actuating handle and the second piston are displaceable relative to one another in the actuating direction over a second free travel, wherein the distance between the starting position and the end position is greater than the second free travel.

3. The discharge device as claimed in claim 1, wherein the second piston is operatively connected to the actuating handle in a play-free manner.

4. The discharge device as claimed in claim 1, wherein an intermediate piece is provided between the first piston and the actuating handle, wherein the actuating handle and the first piston are coupled so as to be relatively movable over the first free travel by the intermediate piece.

5. The discharge device as claimed in claim 4, wherein the intermediate piece is designed in a sleeve-shaped manner, wherein the actuating handle and/or the first piston is guided slidably in the intermediate piece.

6. The discharge device as claimed in claim 4, wherein the intermediate piece is reversibly deformable, wherein the actuating handle or the first piston is produced integrally with the intermediate piece and/or is coupled with said intermediate piece in a substantially play-free manner.

7. The discharge device as claimed in claim 1, wherein a first force element is provided between the first piston and a housing of the first pump chamber, wherein the first piston is displaceable against a restoring force of the first force element for reducing a volume of the pump chamber.

8. The discharge device as claimed in claim 1, wherein a second force element, by means of which the first piston and the actuating handle are held at a distance, is provided between the first piston and the actuating handle.

9. The discharge device as claimed in claim 1, wherein, with the actuating handle in a starting position, the actuating handle and the first piston are arranged spaced apart from one another and when the actuating handle is actuated for a discharge, move to a stop after the first free travel for a movement transmission.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Further advantages of the invention proceed from the sub-claims and from the following description of exemplary embodiments of the invention which are shown schematically in the drawings. Uniform references are used for identical or similar components in the drawings. Features described or shown as part of one exemplary embodiment can also be used in another exemplary embodiment in order to obtain a further embodiment of the invention.

[0021] The drawings are as follows:

[0022] FIG. 1 shows part of a discharge device according to a first exemplary embodiment of the invention and

[0023] FIG. 2 shows part of a discharge device according to a second exemplary embodiment of the invention.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

[0024] FIGS. 1 and 2 show schematic representations in each case of an exemplary embodiment of a discharge device 1 having an actuating handle 2, a first pump system 3 for conveying a first medium and a second pump system 4 for conveying a second medium. The media, in this case, are stored in a first container 30 and a second container 40. The discharge devices 1 shown each include a housing 10 which is common to both pump systems 3, 4 and a cover 11 which is common to both pump system 3, 4.

[0025] In one exemplary embodiment, the first container 30 comprises a drag piston. In one exemplary embodiment, the second container 40 communicates with the surrounding area for pressure equalization. Said development allows a delicate medium to be stored in the first container 30 without contact with the surrounding area, whereas a second medium is stored in the second container 40 without any specific protective measures. The volumes of the two containers 30, 40 deviate from one another, a volume of the second container 30 being greater than that of the first container 40. The described and/or shown development, however, is simply as an example and numerous modifications are conceivable.

[0026] The actuation of both pump systems 3, 4 is effected by means of the common actuating handle 2. One or two or more outlet openings (not shown) for the first and the second medium is or are provided on the actuating handle 2.

[0027] The first medium is conveyed out of the container 30 to the outlet opening or openings (not shown) by means of the first pump system 3. The pump system 3 shown includes a first pump chamber 31 and a first piston 32 which is arranged so as to be slidable in the first pump chamber 31.

[0028] The first piston 32 is designed with multiple parts and includes a ring element 320 which is mounted in the first pump chamber 31, an actuator 322 and a valve slide 324. The valve slide 324 is coupled in a substantially play-free manner with the actuator 322 and by way of the actuator 322 is slidable by a valve stroke relative to the ring element 320 which functions as a valve seat. A thrust bearing 33 is non-movably mounted on a housing 310 of the pump chamber 31. The thrust bearing 33 serves as a stop for the piston 32 in a shown top end position of the piston 32. A force element 34, which is designed as a restoring spring, is provided between the piston 32, more precisely between the actuator 322 of the piston 32, and the thrust bearing 33.

[0029] The piston 32 is displaceable in a known manner from the shown top end position against a restoring force of the force element 34 for a reduction in a volume of the pump chamber 31. In this case, the actuator 322 is first of all displaced with the valve slide 324 relative to the ring element 320 such that an outlet valve 35, which is formed by the valve slide 324 and the ring element, opens. When the actuator 322 is displaced over a distance that exceeds the valve stroke, the actuator 322 moves to the stop with the ring element 320 and the movement of the actuator is transmitted to the ring element 320. As a result of displacing the piston 32, a medium that is present in the pump chamber 31 is displaced such that the medium passes out of the pump chamber 31 by means of the outlet valve 35 into an outlet channel 36 provided in the piston 32. The outlet channel 36 of the piston 32 communicates with a channel 20 in the actuating handle 2, said channel 20 communicating with the outlet opening (not shown). When the piston 32 is moved back into the end position shown on account of the restoring forces of the force element 34, the actuator 322 is first of all moved with the valve slide 324 relative to the ring element 320 such that the outlet valve 35 closes. On account of a negative pressure that is created in the pump chamber 31 during the return movement, the inlet valve 37, which is designed as a ball valve, opens such that medium is conveyed out of the container 30 into the pump chamber 31 for pressure equalization.

[0030] The piston 32 is moved out of the top end position shown by means of the actuating handle 2. In this case, the actuating handle 2 is coupled in such a manner with the first piston 32 that the actuating handle 2 is displaceable over a free travel L in the actuating direction relative to the piston 32.

[0031] In the exemplary embodiment shown in FIG. 1, a rigid intermediate piece 5 is provided for this purpose, the actuating handle 2 and the first piston 32 being coupled so as to be displaceable relative to one another over the free travel L in the actuating direction by means of the intermediate piece 5.

[0032] The intermediate piece 5 shown is developed as a separate, sleeve-shaped component. A component of this type is producible in a cost-efficient manner. The intermediate piece 5 shown is coupled in an at least substantially play-free manner with the piston 32, more precisely with actuator 322 of the piston 32, by means of a latching connection. In other developments, the intermediate piece 5 is produced integrally with the first piston 32, in particular with the actuator 322. In yet another development, the intermediate piece 5 is produced integrally with the actuating handle 2 and is coupled with the piston 32 so as to be slidable by the free travel L relative to the piston 32.

[0033] In the exemplary embodiment shown, a journal 22, which comprises the channel 20 and is slidingly guided in the intermediate piece 5 which is designed as a sleeve, is provided on the actuating handle 2. In the exemplary embodiment shown, the actuating handle 2 and the first piston 32, with the actuating handle 2 in a shown starting position, are arranged spaced apart from one another. A second force element 6, by means of which the first piston 32 and the actuating handle 2 are held at a distance, is provided between the first piston 32 and the actuating handle 2. A maximum distance, in this case, is delimited by stops. The second force element 6, in this case, also serves for stabilizing a relative movement such that jamming or the like is avoided.

[0034] The restoring forces of the first force element 34 and of the second force element 6 are chosen, for example, in such a manner that when the actuating handle 2 is actuated for a discharge, the actuating handle 2 is first of all moved relative to the piston 32 into its starting position without movement transmission to the piston 32. The movement is effected against the restoring force of the second force element 6. After a movement over a distance that corresponds to the free travel L, the actuating handle 2, more precisely the journal 22, moves to the stop with the piston 32 such that when the actuating handle 2 is moved further, a movement is transmitted onto the piston 32.

[0035] Where an actuating force is omitted, the first force element 32 causes the piston 32 to move back into the shown end position of the piston 32. In addition, the actuating handle 2 is moved relative to the piston 32 on account of the restoring forces of the second force element 6. By means of said relative movement, an additional back suction effect is obtained, by means of which a medium that has remained at the outlet opening (not shown) is sucked into the channel 20 and/or the outlet channel 36. As a result, the risk of a product drying and consequently of a blockage in the region of the outlet opening is prevented or at least reduced.

[0036] FIG. 2 shows an alternative development. In contrast to the development according to FIG. 1, an at least partially reversibly deformable intermediate piece 105 is provided, in the case of said development too, the actuating handle 2 and the first piston 32 being coupled by means of the intermediate piece 105 so as to be displaceable relative to one another over the free travel L in the actuating direction. The reversibly deformable intermediate piece 105 is, for example, produced from an elastically deformable material and/or is designed as bellows.

[0037] The intermediate piece 105 shown in FIG. 2 is also designed as a separate component which is coupled with the piston 32, more precisely with the actuator 322 of the piston 32, and with the actuating handle, more precisely with the journal 22 of the actuating handle. A connection is effected in a non-positive or materially bonding manner. In other developments, the intermediate piece 105 is produced integrally, for example as a two-component injection molding part with the actuator 322 or the actuating handle 2.

[0038] In the case of the embodiment shown in FIG. 2, the elastically deformable intermediate piece 105 also assumes the function of the force element 6 according to FIG. 1. In other developments an additional force element is provided.

[0039] As mentioned, a second pump system 4 is provided in both exemplary embodiments shown in FIGS. 1 and 2. The second pump system 4 includes a second piston 42 which is guided in a second pump chamber 41. The second piston 42 is also developed with multiple parts and includes a ring element 420 which is mounted in the second pump chamber 42 and an actuator 422. The second piston 42 includes a thrust bearing 424 for a force element 44 which is arranged in the pump chamber 41.

[0040] In the exemplary embodiment shown, the piston 42, more precisely the actuator 422 of the piston 42, is coupled in at least substantially play-free manner with the actuating handle 2 such that movement is transmitted immediately from the actuating handle 2 to the piston 42.

[0041] The pump systems 3, 4 are actuated together by means of the actuating handle for a discharge. In the exemplary embodiment shown, a metering volume of the second pump system 4, however, is greater than that of the first pump system 3 such that a longer stroke is necessary for a complete discharge. In the exemplary embodiment shown, equalization is created by means of the distance between the actuating handle 2 and the piston 32, the stroke of the first piston 32 being shorter than that of the second piston 42 by a length which corresponds to the free travel L.