Switching device

Abstract

The invention relates to a switching device (1) for selectively connecting a first opening (2) with a second opening (3), comprising a piston (4) and a piston chamber (5) for accommodating the piston (4), the piston chamber (5) comprising at least the first opening (2), wherein the piston (4) comprises a sealing device (6), preferably a sealing disc, which is movable through the first opening (2), and the piston chamber (5) has a widening of the net inner dimensions, in particular the inner diameter (8), of the piston chamber (5) in a piston chamber section (7).

Description

TECHNICAL FIELD

[0001] The invention relates to a switching device for selectively connecting a first opening with a second opening, comprising a piston and a piston chamber for accommodating the piston, the piston chamber comprising at least the first opening, wherein the piston comprises a sealing device, preferably a sealing disc, which is movable through the first opening. BACKGROUND

[0002] Such a switching device can be used, for example, in a sanitary discharge fitting in which a common inlet can be selectively connected with a first outlet or a second outlet. Typically, the first outlet opens into a fixed flow outlet, for example in a bath tub, while the second outlet opens into a shower. Here, it is often switched between the two selectable connections. As a result, the components comprised by the switching device are subject to wear. SUMMARY

[0003] It is an object of the invention to reduce the wear caused by the use of the switching device and thus to prolong the service life of the switching device.

[0004] In order to achieve the stated object, advantageous features are proposed according to the invention. Thus, it is proposed according to the invention, in particular in a switching device of the type mentioned at the outset, that the piston chamber has a widening of the net inner dimension, in particular the inner diameter, of the piston chamber in a piston chamber section.

[0005] The invention is based on the recognition that by the movement of the sealing device within the piston chamber section, the sealing device and the inner wall of the piston chamber section are subject to frictional forces. As a result, wear occurs. By providing a widening of the net inner dimension, it can be achieved that the sealing device is in contact with the inner wall of the piston chamber section or rather in contact fulfilling the sealing function only in those sub-sections of the piston chamber section in which the sealing function is necessary for the function of the switching device. In other sub-sections, the sealing device is not in contact with the inner wall of the piston chamber section or rather not in contact fulfilling the sealing function when the sealing device is moved. As a result, the wear of the switching device is reduced and its service life is prolonged.

[0006] The net inner dimension can be given, for example, by the fact that it characterizes the dimension of the piston chamber transversely to the direction of movement of the piston. For example, the net inner dimension can be the net inner diameter, in particular the maximum, minimum or average inner diameter in the case of a non-circular cross-section, or the inner diameter in the case of a cylindrical piston chamber.

[0007] The switching device can have, for example, a third opening or even further openings, which can be selectively or jointly fluidically connected with the first opening and / or the second opening.

[0008] In an advantageous design it can be provided that the piston chamber section comprises a first opening. The net inner dimension in the region of the first opening is thus increased in order to reliably avoid contact of the sealing device with the first opening. The widening here preferably begins outside the first opening. The widening can for example be configured entirely outside the first opening or partially into the region of the first opening.

[0009] In an advantageous design it can be provided that the piston chamber section has a narrowing of the widened net inner dimension, wherein the first opening is preferably arranged between the widening and the narrowing. A sealing closure by the sealing device behind the first opening in the direction of movement is thus possible.

[0010] In an advantageous design it can be provided that the piston chamber has a net inner dimension before and after the piston chamber section. A sealing closure of the sealing device on the other side of the first opening is thus possible. In other words, the narrowing of the widened inner dimension is configured opposite to the widening of the inner dimension. The narrowing thus reverses or withdraws the widening.

[0011] Furthermore, the wear of the switching device, in particular of the sealing device, which occurs when the sealing device moves past the boundary of the first opening or the surrounding edge, is thus reduced, the wear forces and friction forces being particularly high at the boundary or at the surrounding edge.

[0012] In an advantageous design it can be provided that the sealing device comprises an elastic sealing ring, preferably an elastic O-ring.

[0013] The elastic sealing ring reduces the wear due to the friction forces between the inner wall of the piston chamber and the piston. Furthermore, the wear occurs mainly on the sealing ring due to the elasticity of the sealing ring. The sealing ring can be easily replaced. The service life of the switching device can thus be further extended.

[0014] In an advantageous design it can be provided that in the first position of the sealing device the first opening is fluidically separated from the second opening, while in the second position of the sealing device the first opening is fluidically connected to the second opening, and in the first position of the sealing device the first opening is fluidically connected to the third opening, while in the second position of the sealing device the first opening is fluidically separated from the third opening.

[0015] For example, the first position of the sealing device is located between the first opening and the second opening, while the second position of the sealing device is located between the first opening and the third opening. In order to switch between the connection of the first opening to the second opening and the connection of the first opening to the third opening, only the movement of the sealing device past the first opening is thus required. The wear of the sealing device remains small by the small movement of the sealing device, in particular when the piston chamber section comprises the first opening.

[0016] In an advantageous design it can be provided that the net inner dimension of the piston chamber varies uniformly, in particular continuously, within the piston chamber section.

[0017] Hereby an abrupt transition between the net inner dimension and the widened net inner dimension is prevented. At such a transition particularly high wear and friction forces can occur.

[0018] In an advantageous design it can be provided that the piston chamber comprises a first piston chamber part and a second piston chamber part which is or has been joined to the first piston chamber part.

[0019] In an advantageous design it can be provided that the first piston chamber part or the second piston chamber part at least partially comprises the piston chamber section, or that the first piston chamber part and the second piston chamber part each partially comprises the piston chamber section.

[0020] In an advantageous design it can be provided that the first piston chamber part or the second piston chamber part at least partially comprises the first opening, or that the first piston chamber part and the second piston chamber part each partially comprises the first opening.

[0021] By manufacturing two separate cylinder parts it is in particular possible to manufacture the transition between the net inner dimension and the widened net inner dimension with high precision and hereby to ensure small wear and friction forces between the piston and the piston chamber.

[0022] In a design of the application it can be provided that the widening is formed on the first piston chamber part. Here it is advantageous that the widening can be introduced without undercuts, which simplifies the manufacture.

[0023] Here it can be provided that the narrowing is formed on the second piston chamber part. Here it is advantageous that the narrowing can also be introduced without undercuts, which simplifies the manufacture.

[0024] It is therefore advantageous, in particular for the manufacture of the switching device, that the separation at which the first piston chamber part and the second piston chamber part are joined is located between the widening and the narrowing.

[0025] In an advantageous design it can be provided that the first piston chamber part comprises a sleeve for accommodating the second piston chamber part, in particular the sleeve defining the widening.

[0026] Here it can be provided in particular that the sleeve is guided through and / or opens at the third opening already mentioned and is embodied with a through opening. The insertion sleeve thus forms an outlet.

[0027] In an advantageous design it can be provided that the first piston chamber portion and the second piston chamber portion each comprise at least one connection element for connecting, in particular detachably connecting, the first piston chamber portion and the second piston chamber portion, wherein the at least one connection element is located outside the piston chamber section. In other words, the connection element is arranged outside the area defined by the widening and the narrowing.

[0028] This has the advantage that the first opening is configured spatially separate from the connection element. Thereby a particularly pressure-resistant connection can be established. Thereby it is ensured that the switching device withstands high pressures at the first opening which can be connected to the inlet. BRIEF DESCRIPTION OF DRAWINGS

[0029] The application is now described in more detail by means of embodiments, to which, however, the application is not limited. Further embodiments result from the individual or multiple features in combination with one another.

[0030] The drawings show schematically:

[0031] Figure 1 a bistable switching device according to a first embodiment, wherein the piston is in a first position,

[0032] Figure 2 a bistable switching device according to a first embodiment, wherein the piston is in a second position,

[0033] Figure 3 a switching system comprising a bistable switching device according to a first embodiment, wherein the piston is in a first position,

[0034] Figure 4 a switching system comprising a bistable switching device according to a first embodiment, wherein the piston is in a second position,

[0035] Figure 5 a spatial view and an exploded view of a switching device according to a first embodiment,

[0036] Figure 6 a monostable switching device according to a second embodiment, wherein the piston is in a first position,

[0037] Figure 7 a spatial view and an exploded view of a switching device according to a second embodiment,

[0038] Figure 8 a monostable switching device according to a third embodiment, wherein the piston is in a first position,

[0039] Figure 9 a spatial view and an exploded view of a switching device according to a third embodiment. DETAILED DESCRIPTION

[0040] Figure 1 A bistable switching device according to a first embodiment is shown designated with 1. The switching device 1 has a first opening 2 which can be connected to an inlet, for example. The switching device 1 has a second opening 3 which can be connected to a first outlet, for example. Furthermore, the switching device 1 has a third opening 10 which can be connected to a second outlet, for example. Alternatively, for example, the first opening 3 can be connected to an outlet, the second opening 3 can be connected to a first inlet, and the third opening 10 can be connected to a second inlet.

[0041] The switching device 1 comprises a piston 4. The piston 4 is accommodated in a piston chamber 5. The piston chamber 5 comprises the first, second and third openings 2, 3 and 10. The piston chamber 5 is, for example, a piston cylinder having a circular base surface. The base surface of the piston chamber can likewise be designed, for example, as an oval or a polygon.

[0042] The piston 4 is movable within the piston chamber 5. The piston 4 is movable in translatory motion along a longitudinal axis of the piston chamber 5. The movement of the piston 4 within the piston chamber 5 is limited by an upper side wall and a lower side wall and by a piston chamber housing. The piston 4 can only be moved along the longitudinal axis, in particular from a first position into a second position. Figure 1 The piston 4 is shown in the first position. Figure 2 The piston is shown in the second position.

[0043] The piston 4 comprises a sealing device 6 which can be configured as a sealing disc or a sealing ring around the longitudinal axis of the piston 4. The sealing device 6 comprises an elastic sealing ring 9. The sealing device 6 or the sealing ring 9 is configured, for example, circular, oval or polygonal. The elastic sealing ring 9 is in contact with the inner wall of the piston or with the piston chamber housing in the shown first position of the piston 4. This is in particular because the outer dimension, here the outer diameter, of the elastic sealing ring 9 comprised by the sealing device 6 is greater than the net inner dimension, here the net inner diameter 8, of the piston chamber 5. By the contact fulfilling the sealing function, the elastic sealing ring 9 is deformed and / or compressed.

[0044] The piston chamber 5 comprises a piston chamber section 7 which has a widening 26 of the inner dimension. Furthermore, the piston chamber section 7 has a narrowing 27 of the widened inner dimension. The widening 26 and the narrowing 27 can be configured as a step-like or uniformly extending widening or narrowing. The narrowing 27 is configured opposite the widening 26. The narrowing 27 reverses or retracts the widening 26. The sealing device 6, in particular the elastic sealing ring 9, is movable on the widening 26 and on the narrowing 27, in particular on the piston chamber section 7.

[0045] In the embodiment shown, the widened inner dimension between the widening 26 and the narrowing 27 is constant. In this way, the piston cavity section 7 comprises a widened section in which the net inner dimension of the piston section 7 remains essentially unchanged, that is to say, is constant.

[0046] In other words: The piston cavity 5 comprises a first sub-section and a second sub-section, wherein the first sub-section is arranged before and / or after the second sub-section and the second sub-section is arranged between the widening 26 and the narrowing 27, and the first sub-section has an essentially constant first net inner dimension and the second sub-section has an essentially constant second net inner dimension, and the first net inner dimension is smaller than the second net inner dimension.

[0047] In other words again: The piston section 7 comprises two transition sections which are formed on the edge of the piston section 7, wherein the inner dimension, in particular the inner diameter, of the transition sections from the net inner dimension of the piston section 7 to the net inner dimension of the piston cavity 5 or vice versa changes continuously. Alternatively, the net inner dimension of the piston section 7 can continuously change from a minimum value to a maximum value and vice versa, in particular without the piston section 7 having a widened section with a constant net inner dimension.

[0048] The piston cavity section 7 comprises the first opening 2 in the switching device 1 shown. The first opening 2 originates from the widened section of the piston cavity section 7. Likewise, the widening 26 and / or the narrowing 27 can project into the opening or be arranged in front of or behind the opening in the movement direction of the piston 4.

[0049] If the sealing device 6 moves past the first opening 2, for example the piston 4 is moved into the second position (see Figure 2 As long as the resilient sealing ring is located in the piston cavity section 7, in particular at the height of the widened net inner dimension of the piston section 7, the resilient sealing ring 9 is less strongly deformed and / or compressed. The widened net inner dimension in the piston section 7 can be greater than the outer dimension, here the outer diameter, of the resilient sealing ring 9 comprised by the sealing device 6. In this way, the resilient sealing ring 9 does not come into contact or comes into contact only weakly with the inner wall of the piston cavity 5 at least in sections of the piston section 7. Thus, the resilient sealing ring 9 slides or "flies" past the piston section 7, in particular the first opening 2, without or almost without friction occurring between the sealing ring 9 and the inner wall of the piston cavity 5.

[0050] In this way, the wear of the sealing ring 9 and / or the piston cavity 5 caused by friction is reduced. Furthermore, the movement of the sealing device 6 over the piston section 7, in particular from the first position to the second position of the piston 4 and vice versa, can be achieved with less force expenditure by the reduced friction. Thus, the switching device 1 is more durable on the one hand and more easy to handle on the other hand.

[0051] Figure 2 The switching device is shown in Figure 1 . Identical features are provided with identical reference signs. In Figure 2 , the switching device 1 is shown with the piston 4 in the second position. The above-mentioned first and second positions of the piston 4 are in particular first and second stop positions, wherein the first stop position is defined by a boundary of the piston cavity 5 on a first side of the piston cavity 5 extending perpendicular to the longitudinal axis of the piston cavity 5, and the second stop position is defined by a second boundary of the piston cavity 5 on the side of the piston cavity 5 opposite the first boundary.

[0052] The piston cavity portion:

[0053] As shown in Figure 1 and Figure 2 , the piston cavity 5 is composed of a first piston cavity portion 11 and a second piston cavity portion 12. The first piston cavity portion 11 and the second piston cavity portion 12 can be connected, for example, by means of a force-locked, form-locked or material-locked connection, in particular by means of a (non-destructively) releasable connection element to one another. In the embodiment shown in Figure 2 , the first piston cavity portion 11 and the second piston cavity portion 12 are connected by means of a first connection element 13 comprised by the first piston cavity portion 11 and a second connection element 14 comprised by the second piston cavity portion 12. The intermeshing connection elements 13 and 14 are each formed in the form of a barb and form a snap connection, thereby ensuring a secure and reliable connection which is at the same time releasable and reconnectable. The connection elements 13 and 14 can likewise be formed as a thread and form a threaded connection.

[0054] The first piston cavity portion 11 or the second piston cavity portion 12 can comprise the piston cavity section 7. Alternatively, the first piston cavity portion 11 and the second piston cavity portion 12 can each partially comprise the piston cavity section 7. In particular, the first piston cavity portion 11 can comprise a widening 26 and the second piston cavity portion 12 can comprise a narrowing 27.

[0055] Likewise, the first piston cavity portion 11 or the second piston cavity portion 12 can comprise the circumferential edge defining the first opening. Alternatively, the first piston cavity portion 11 and the second piston cavity portion 12 can each partially comprise the circumferential edge and, after engagement of the first piston cavity portion 11 and the second piston cavity portion 12, each partially comprise or form the first opening.

[0056] In particular, the first connection element 13 and the second connection element 14 can be as in Figure 2The piston cavity 5 is comprised of the piston cavity sections 7 as shown in the middle. Furthermore, the connecting element 13 or the connecting element 14 can comprise a surrounding edge defining the first opening. Alternatively, the first connecting element 13 and the second connecting element 14 can each partially comprise a surrounding edge and, after the connecting elements 13 and 14 are joined, partially comprise or form the first opening, respectively.

[0057] The bipartite division of the piston cavity 5 provides the possibility of widening 26 and narrowing 27 of the net inner dimension of the piston cavity 5 with high precision. This is especially true when the piston cavity section 7 or a part of the piston cavity section 7 is located on the outer edge of at least one of the piston cavity sections 11 and 12. Thereby, it is ensured that the piston cavity sections 11 and 12 and thus the piston cavity 5 are simplified and precisely manufactured.

[0058] In one embodiment (not shown), the piston cavity 5 can comprise a plurality of piston sections 7 in which the piston cavity 5 has a widening 26 of the net inner dimension and a narrowing 27 of the widened net inner dimension, respectively. In particular, the plurality of piston sections 7 can each comprise one opening in the piston cavity, for example one of the first opening 2, the second opening 3 and the second opening 3, respectively. The opening in the piston cavity 5 is here in particular the opening in the piston cavity housing.

[0059] The piston 4 is movable from the first position into the second position by means of a handling device 15 and is lockable in the second position. The piston 4 is movable from the second position into the first position by means of a reset device 16. The reset device 16 is for example a spring element.

[0060] Figure 3 The switching device 1 shown in Figure 1 and 2 is shown in a switching system comprising a channel system 18 for accommodating the switching device 1. The switching device 1 is fixedly connected or connectable with the channel system 18, in particular by means of a force-locking, form-locking or material-locking.

[0061] The channel system 18 comprises an inlet 19, a first outlet 20 and a second outlet 21. The switching device 1 is connected with the channel system 18 in such a way that the first opening 2 of the switching device 1 is fluidically connected with the inlet 19, the second opening 3 of the switching device 1 is fluidically connected with the first outlet 20 and the third opening 10 of the switching device 1 is fluidically connected with the second outlet 21. Thus, in the shown first position of the piston 4 or of the sealing device 6, the inlet 19 is fluidically separated from the first outlet 20 and is fluidically connected with the second outlet 21 in space. In an analogous manner, in the second position of the piston 4 or of the sealing device 6 (see Figure 4 ), the inlet 19 is fluidically separated from the second outlet 21 and is fluidically connected with the first outlet 20.

[0062] Figure 4 a switching system as indicated with 17 in Figure 3 , wherein the piston 4 is in the second position. Identical features are provided with identical reference numerals.

[0063] Figure 5 a switching device as indicated with 1 in Figure 1 and 2 , in a spatial view and in an exploded view. Identical features are provided with identical reference numerals.

[0064] Figure 6 a switching device as indicated with 22 in accordance with a second embodiment is shown. The switching device 22 is similar to the switching device 1. In this regard, reference is made to the above description. Identical or similar features are provided with identical reference numerals. The switching device 22 differs from the switching device 1 in that the switching device 22 has a first piston cavity portion 11a and a second piston cavity portion 12a, wherein the first piston cavity portion 11a comprises a sleeve 24 in order to accommodate the second piston cavity portion 12a.

[0065] The first and second piston cavity portions 11a and 12a are connectable or connected by a threaded connection. The first piston cavity portion 11a comprises a first connection element 13a, here a screw thread. The sleeve 24 of the second piston cavity portion 12a comprises a second connection element 14a, here a sleeve thread. The first and second connection elements 13a and 14a are arranged outside the piston cavity section 7, in particular outside the widened section.

[0066] The sleeve 24 extends from the connection element 14a up to the widened section of the piston cavity section 7. The first piston cavity portion 11a comprises the widened section, which is delimited by the sleeve 24. The first and second piston cavity sections 11a and 12a comprise a widening 26 or a narrowing 27, respectively, of the inner dimension of the piston cavity 5. In the shown embodiment, the first piston cavity portion 11a comprises the widening 26 and the second piston cavity portion 12a comprises the narrowing 27. The first piston cavity portion 11a comprises the widened section in the piston cavity section 7, the first opening 2 and the second opening 3. The first and second piston cavity portions 11a and 12a comprise the third opening 10.

[0067] Corresponding to the third opening 10, the sleeve 24 has a through opening 25 in order to form an outlet or an inlet.

[0068] Figure 7 a switching device as indicated with 22 in Figure 6 , in a spatial view and in an exploded view. Identical features are provided with identical reference numerals.

[0069] Figure 8A single-stable switching device according to the third embodiment is shown designated with 23. The switching device 23 is similar to the switching device 22 and the switching device 1. In this regard, reference is made to the above description. Identical or similar features are provided with identical reference numerals. The switching device 23 has a first piston cavity portion 1 1 b and a second piston cavity portion 12b, wherein the first piston cavity portion 1 1 b comprises a sleeve 24 for accommodating the second piston cavity portion 12b.

[0070] The difference to the switching device 22 is that the first and second piston cavity portions 1 1 b and 12b are connectable or connected by a snap connection. The first piston cavity portion 1 1 b comprises a first connecting element 13b and the sleeve 24 of the second piston cavity portion 12b comprises a second connecting element 14b. The first connecting element 13b comprises a snap hook which snaps into a recess, in particular an undercut, of the second connecting element 14b in the connected state of the piston cavity portions 1 1 b and 12b. The first and second connecting elements 13b and 14b are arranged outside the piston cavity section 7, in particular outside the widened section.

[0071] Figure 9 A space view and an exploded view of the switching device according to the third embodiment is shown designated with 23 in Fig. 10. Identical features are provided with identical reference numerals. Figure 6

[0072] List of reference numerals

[0073] 1 bistable switching device according to the first embodiment

[0074] 2 first opening

[0075] 3 second opening

[0076] 4 piston of the bistable switching device according to the first embodiment

[0077] 4a piston of the single-stable switching device according to the second and third embodiment

[0078] 5 piston cavity

[0079] 6 sealing device

[0080] 7 piston cavity section

[0081] 8 net inner diameter of the piston cavity

[0082] 9 elastic sealing ring

[0083] 10 third opening

[0084] 1 1 first piston cavity portion according to the first embodiment

[0085] 1 1 a first piston cavity portion according to the second embodiment ​

[0086] 11b First piston chamber part according to third embodiment

[0087] 12 Second piston chamber part according to first embodiment

[0088] 12a Second piston chamber part according to second embodiment

[0089] 12b Second piston chamber part according to third embodiment

[0090] 13 First connecting element according to first embodiment

[0091] 13a First connecting element according to second embodiment

[0092] 13b First connecting element according to third embodiment

[0093] 14 Second connecting element according to first embodiment

[0094] 14a Second connecting element according to second embodiment

[0095] 14b Second connecting element according to third embodiment

[0096] 15 Operating device

[0097] 16 Reset device

[0098] 17 Switching system

[0099] 18 Channel system

[0100] 19 Inlet

[0101] 20 First outlet

[0102] 21 Second outlet

[0103] 22 Monostable switching device according to second embodiment

[0104] 23 Monostable switching device according to third embodiment

[0105] 24 Sleeve

[0106] 25 Passage opening

[0107] 26 Widening

[0108] 27 Narrowing

Claims

1. A switching device (1) for selectively connecting a first opening (2) to a second opening (3), the switching device (1) comprising a piston (4) and a piston chamber (5) for receiving the piston (4), the piston chamber (5) including at least the first opening (2), wherein, The piston (4) includes a sealing device (6), which includes a resilient sealing ring (9) and is movable through the first opening (2). The piston chamber (5) has a widened portion (26) with a net inner dimension of the piston chamber (5) and a narrowed portion with a widened net inner dimension in a piston chamber section (7), wherein the sealing device (6) is movable on the widened portion (26) and the narrowed portion (27) with its elastic sealing ring (9), the piston chamber (5) includes a first piston chamber portion (11) and a second piston chamber portion (12) that can engage with the first piston chamber portion (11), wherein the widened portion (26) is formed on the first piston chamber portion (11) and the narrowed portion is formed on the second piston chamber portion (12), and the first piston chamber portion (11) and the second piston chamber portion (12) each partially include the piston chamber section (7). The characteristic feature is that, in the first position of the sealing device (6), the first opening (2) and the second opening (3) are fluidly separated, while in the second position of the sealing device (6), the first opening (2) and the second opening (3) are fluidly connected, and In the first position of the sealing device (6), the first opening (2) is fluidly connected to the third opening (10), while in the second position of the sealing device (6), the first opening (2) is fluidly separated from the third opening (10).

2. The switching device according to claim 1, characterized in that, The piston chamber section (7) includes the first opening (2).

3. The switching device according to claim 1, characterized in that, The first opening is arranged between the widened portion (26) and the narrowed portion (27).

4. The switching device according to any one of claims 1 to 3, characterized in that, The piston chamber (5) has a net internal dimension before and after the piston chamber section (7).

5. The switching device according to any one of claims 1 to 3, characterized in that, The sealing device (6) includes an elastic O-ring.

6. The switching device according to any one of claims 1 to 3, characterized in that, The net internal dimensions of the piston cavity (5) vary uniformly within the piston cavity section (7).

7. The switching device according to claim 6, characterized in that, The net internal dimensions of the piston cavity (5) vary continuously within the piston cavity section (7).

8. The switching device according to any one of claims 1 to 3, characterized in that, The first piston chamber portion (11) or the second piston chamber portion (12) at least partially includes the first opening (2), or the first piston chamber portion (11) and the second piston chamber portion (12) each partially include the first opening (2).

9. The switching device according to any one of claims 1 to 3, characterized in that, The first piston chamber portion (11) includes a sleeve (24) for receiving the second piston chamber portion (12).

10. The switching device according to claim 9, characterized in that, The sleeve (24) defines the widened portion (26) and / or the narrowed portion (27).

11. The switching device according to any one of claims 1 to 3, characterized in that, The first piston chamber portion (11) includes a first connecting element (13a), and the second piston chamber portion (12) includes a second connecting element (14a) for connecting the first piston chamber portion (11) and the second piston chamber portion (12), wherein the first connecting element (13a) and the second connecting element (14a) are arranged outside the piston chamber section (7).

12. The switching device according to claim 11, characterized in that, The first connecting element (13a) and the second connecting element (14a) are used to detachably connect the first piston chamber portion (11) to the second piston chamber portion (12).

13. The switching device according to claim 1, characterized in that, The net internal dimension is the inner diameter (8).

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