# Patent

## Title
Milk conduit, and a milk conduit assembly

## Abstract

A milk conduit, that connects to a teatcup to be attached to a teat of an animal to be milked, includes a first end portion defining a first end and configured to be connected to the teatcup, a second end portion defining a second end, and a conduit portion located between the first end portion and the second end portion. The milk conduit defines a milk channel extending through the first end portion, the conduit portion and the second end portion. The first end portion is received in an opening extending through a bottom wall of the teatcup. The first end portion includes a first circumferential groove configured that engages in the bottom wall of the teatcup.

## Background
TECHNICAL FIELD OF THE INVENTION
The present invention refers generally to teatcups to be attached to the teats of an animal to be milked. More specifically, the present invention refers to a milk conduit according to claim 1 to be connected to a teatcup liner of a teatcup. Furthermore, the present invention refers to a milk conduit assembly according to claim 10.
BACKGROUND OF THE INVENTION AND PRIOR ART
Teatcups used today typically consist of two separate main parts, a shell and a teatcup liner mounted in the shell. The teatcup liner is an article of consumption that is subjected to wear, and thus has to be replaced on a regular basis. The replacement of the teatcup liner is a time-consuming and difficult work, requiring dismounting of the teatcup liner from the shell and mounting of a new teatcup liner in the shell.
Traditionally, the teatcup liner forms one single part together with the short milk conduit. In order to enable replacement of only the barrel of the teatcup liner, it is know to produce teatcup liners being separate from the milk conduit. Examples of such separate milk conduits are disclosed in U.S. Pat. No. 6,895,890 and U.S. Pat. No. 6,895,892.
U.S. Pat. No. 6,895,890 discloses a milk conduit configured to be connected to a teatcup liner of a teatcup to be attached to a teat of an animal to be milked. The milk conduit comprises a first end portion defining a first end and configured to be connected to the teatcup, a second end portion defining a second end, and a conduit portion between the first end portion and the second end portion. The milk conduit defines a milk channel extending through the first end portion, the conduit portion and the second end portion. The first end portion is configured to be received on a nipple extending downwardly from the teatcup.
Such a connection of the milk conduit to the teatcup is disadvantageous since it makes the dismounting and the mounting of the teatcup to the milk conduit difficult and time-consuming. Also the sealing between the milk conduit, the pulsation chamber and the surrounding environment may cause problems.
SUMMARY OF THE INVENTION
The object of the present invention is to overcome the problems discussed above, and to provide a milk conduit that enables a quick and secure attachment of the milk conduit to a teatcup.
This object is achieved the milk conduit initially defined characterised in that the first end portion is configured to be received in an opening extending through a bottom wall of the teatcup, and that the first end portion comprises a first circumferential groove configured to engage said bottom wall.
Such circumferential groove permits the milk conduit to be firmly mounted in the teatcup. The milk conduit may be easily mounted through a pulling movement through the opening from the teatcup side with the second end portion first. When the wall surrounding the opening during the pulling movement, reaches the circumferential groove the wall will snap into the circumferential groove so that the milk conduit is securely connected to the teatcup. The milk conduit may be easily dismounted from the teatcup by being bent downwards mainly in the direction of the pulling movement.
According to an embodiment of the invention, the first end portion has an external tapering shape from the first end to the conduit portion. Such a tapering such further facilitates the mounting of the milk conduit, especially the last distance of the pulling movement before the wall snaps into the circumferential groove. Advantageously, the first circumferential groove is positioned at a distance from the first end and at a distance from the conduit portion.
According to a further embodiment of the invention, the milk channel of the first end portion has an internal tapering shape from the first end towards the milk channel of the conduit portion. The internal tapering shape may provide a radial seal with the part of the teatcup introduced therein when the milk conduit is connected to the teatcup. The milk channel, from the inner space of the teatcup liner, will thus be securely sealed with respect to the surrounding environment and the pulsation chamber of the teatcup. Such a radial sealing, in contrast to an axial sealing, reduces the forces needed for mounting the milk conduit to the teatcup, and also facilitates the guiding of the teatcup and the milk conduit during the mounting. Furthermore, the internal tapering shape contributes to a proper laminar milk flow. The internal tapering shape may advantageously be conical or substantially conical. Advantageously, the first end may be defined by a plane, or substantially plane, end surface, from which the internal tapering shape extends.
According to a further embodiment of the invention, the second end portion comprises a second circumferential groove. Such a groove facilitates the mounting of the milk conduit to a milk-receiving or milk-collecting member, such as a claw. Advantageously, the second circumferential groove is positioned at a distance from the second end and at a distance from the conduit portion. Furthermore, the second end portion may have an external tapering shape from the second end to the conduit portion.
According to a further embodiment of the invention, the milk conduit is manufactured of a hose material having a relatively high elasticity. Such a hose material may be rubber, black rubber, silicone rubber or Thermoplastic Elastomers, TPE.
According to a further embodiment of the invention, the conduit portion comprises an bending area having a locally increased elasticity to provide a predetermined area for bending of the milk conduit. Advantageously, the bending area is formed by a locally decreased outer diameter of the conduit portion.
The object is also achieved by the milk conduit assembly initially defined which comprises a milk conduit and a connector configured to connect the milk conduit to the teatcup, wherein the connector comprises a casing, which defines a longitudinal centre axis and comprises

    
    
        a bottom wall and an inner surface defining a connection space,
        an inlet opening to the connection space, and
        an outlet opening extending through the bottom wall and receiving and holding the milk conduit.
    
    


The milk conduit fits properly in such a connector by means of which the teatcup may be quickly and securely connected to the milk conduit.
According to a further embodiment of the invention, the bottom wall engages the first circumferential groove. Advantageously, the bottom wall may be is plane, or substantially plane. Furthermore, the bottom wall may extend perpendicularly to the longitudinal centre axis. The end surface of the first end portion of the milk conduit may, when the milk conduit is mounted in the connector, be perpendicular to the longitudinal axis.
According to a further embodiment of the invention, the casing is made of a shell material having a relatively high stiffness, and thus a relatively low elasticity, especially in comparison with the elasticity of the milk conduit.



BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be explained more closely by means of a description of various embodiments and with reference to the drawings attached hereto.
FIG. 1 discloses a longitudinal section of a teatcup comprising or connected to a milk conduit.
FIG. 2 discloses an exploded longitudinal section of a cartridge of the teatcup in FIG. 1.
FIG. 3 discloses a section of the milk conduit in FIG. 1.
FIG. 4 discloses a section of a connector of the teatcup in FIG. 1.
FIG. 5 discloses a section of a pulse conduit of the teatcup in FIG. 1.



DETAILED DESCRIPTION OF VARIOUS EMBODIMENTS OF THE INVENTION
FIG. 1 discloses a teatcup to be attached to a teat of an animal to be milked. The teatcup comprises a cartridge 1 and a connector 2. The teatcup may also comprise a lip member 3. In addition, the teatcup may comprise or be connected to a milk conduit 4, such as a short milk conduit. Moreover, the teatcup may comprise or be connected to a pulse conduit 5.
A longitudinal centre axis x extends through and along the teatcup, i.e. the cartridge 1, the connector 2 and the lip member 3. The longitudinal centre axis x also extends through and along the milk conduit 4 when it is in a rest state as disclosed in FIG. 1.
The cartridge 1, see also FIG. 2, comprises a sleeve 6 having an upper end 6a and a lower end 6b, and a teatcup liner 7 mounted in the sleeve 6. In FIGS. 1 and 2, the cartridge is shown in a mounted state, i.e. the teatcup liner 7 is mounted in the sleeve 6. The teatcup liner 7 has or forms an inner space 8 for receiving the teat. A pulsation chamber 9 is provided or formed between an inner side of the sleeve 6 and an outer side of the teatcup liner 7.
The teatcup liner 7 comprises an upper end portion 7a located at the upper end 6a of the sleeve 6, a barrel portion 7c and a lower end portion 7b located at the lower end of the sleeve 6. The barrel portion 7c is an intermediate tubular portion provided between and adjoining the upper end portion 7a and the lower end portion 7b. The barrel portion 7c is the main part of the teatcup liner 7 and is in contact with the teat of the animal during milking.
The lower end portion 7b extends from a position within the sleeve 6 away from and beyond the lower end 6b of the sleeve 6. The lower end portion 7b forms an end nozzle 10. The end nozzle 10 is the part of the lower end portion 7b that extends beyond the lower end 6b of the sleeve 6. The end nozzle 10 forms an outlet from the inner space 8.
The end nozzle 10 has a tapering external shape configured to be received in the milk conduit 4 for transporting the milk from the inner space 8 to the milk conduit 4. The end nozzle 10 also has a tapering internal shape forming a tapering outlet for the milk from the inner space 8 of the teatcup liner 7.
The barrel portion 7c of the teatcup liner 7 is made of a first material having a relatively high elasticity. The lower end portion 7b of the teatcup liner 7 is made of a second material, which is different from the first material and has a different composition. The second material has a relatively low elasticity in comparison with the relatively high elasticity of the first material of the barrel portion 7c. 
The first material may consist of or comprise rubber, black rubber, silicone rubber, elastic polymers, such as Thermoplastic Elastomers, TPE, or any other suitable elastic material.
The second material may consist of or comprise a suitable polymer with low elasticity, such as polyeten, polypropene, etc.
The upper end portion 7a is made in a third material having a relatively low elasticity in comparison with the relatively high elasticity of the first material of the barrel portion 7c. The third material may be a material having similar or the same composition and/or properties as the second material of the lower end portion 7b. 
The barrel portion 7c is attached to the lower end portion 7b by a lower permanent joint 11. Such a permanent joint 11 may be formed by a melt joint, a weld joint or a chemical bonding between the first material and the second material.
The barrel portion 7c is also attached to the upper end portion 7a by an upper permanent joint 12. Such a permanent joint 12 may be formed by a melt joint, a weld joint or a chemical bonding between the first material and the third material.
The lower and/or upper permanent joints 11, 12 my be formed by melting of at least one of the first material and the second material at the permanent joint. The lower and/or upper permanent joints 11, 12 may also be obtained through vulcanisation.
Alternatively, the barrel portion 7c and the lower end portion 7b and/or the upper end portion 7a are made of the same material, for instance in one single piece, preferably through injection moulding.
The sleeve 6 is made of a fourth material having a relatively low elasticity. The fourth material may be a material having similar or the same composition and/or properties as the same material as the second material.
The lower end portion 7b of the teatcup liner 7 comprises a lower engagement member 14, which engages the sleeve 6 in such a manner that the barrel portion 7c of the teatcup liner 7 is maintained in a stretched state in the sleeve 6. The lower engagement member 14 comprises, or is formed as, an annular flange extending outwardly at least beyond an inner diameter of an end surface of the lower end 6b of the sleeve 6. The annular flange of the lower end portion 7b may extend radially or substantially radially outwardly with respect to the longitudinal centre axis x. The annular flange of the lower end portion 7b extends beyond and abuts the end surface of the lower end 6b of the sleeve 6.
The upper end portion 7a of the teatcup liner 7 comprises an upper engagement member 15, which engages the sleeve 6 at the upper end 6a of the sleeve 6. The upper engagement member 15 comprises, or is formed as, an upper annular flange extending outwardly at least beyond an inner diameter of an end surface of the upper end 6a of the sleeve 6. The annular flange of the upper engagement member 15 may extend radially or substantially radially outwardly with respect to the longitudinal centre axis x. In the embodiment disclose, the annular flange of the upper engagement member 15 of the upper end portion 7a abuts an outwardly bent part of the first material of the barrel portion 7c, which in turn abuts the end surface of the upper end 6a of the sleeve 6.
The sleeve 6 comprises a sealing ring 17 extending around an outer surface of the sleeve 6. The sealing ring 17 is configured to engage a surface, especially an end surface, of the connector 2, as will be described below.
Moreover, the sleeve 6 comprises a hole 18 through the sleeve 6, or through the wall of the sleeve 6. The hole 18 permits a pulsating vacuum to be applied in the pulsation chamber 9. The hole 18 is provided between the sealing ring 17 and the lower end 6b of the sleeve 6.
The lip member 3 is in the embodiment disclosed attached to the upper end portion 7a of the teatcup liner 7, as can be seen in FIGS. 1 and 2. The lip member 3 is preferably detachably attached to the cartridge 1 by a snap connection 19. In FIG. 2 the lip member 3 is shown in a detached state with respect to the teatcup liner 7 and the cartridge 1. Alternatively, the lip member 3 may be detachably attached to the sleeve 6.
The lip member 3 comprises or forms a lip 20, which surrounds and defines an opening 21 for the teat to the inner space 8. The lip 20 is also made of a relatively elastic material, possibly a material having similar or the same composition and/or properties as the first material of the barrel portion 7c. 
It is to be noted that the lip member or the lip 20 as an alternative may form an integrated part of the teatcup liner 7, preferably by being permanently joined to the upper end portion 7a, or being manufactured in one single piece with the upper end portion 7a or with the teatcup liner 7.
The connector 2, see also FIG. 4, comprises a casing 24, which has a bottom wall 25 and a surrounding wall 26 having an inner surface. The casing 24 defines a connection space 27. The bottom wall 25 is plane or substantially plane.
The connector 2, or the casing 24, comprises an inlet opening 28 for the cartridge 1 to the connection space 27, and an outlet opening 29 for the milk conduit 4. The outlet opening 29 extends through the bottom wall 25 and is configured to receive and hold the milk conduit 4. In the embodiment disclosed, the longitudinal centre axis x extends concentrically through the casing 24 and through the inlet opening 28 and the outlet opening 29, wherein the bottom wall 25 extends perpendicularly, or substantially perpendicularly to the longitudinal centre axis x.
The connector 2 is connected to the cartridge 1 by means of locking means. The locking means is provided on the inner surface of the surrounding wall 26. Corresponding locking means is provided on the outer side of the sleeve 6. The corresponding locking means is provided between the sealing ring 17 and the lower end 6b of the sleeve 6. The locking means may comprise on or more outer bayonet coupling parts 31 on the inner surface of the casing 24. The corresponding locking means may comprise one or more inner bayonet coupling parts 32 on the outer surface of the sleeve 6 of the cartridge 1. The outer bayonet coupling parts 31 and the inner bayonet coupling parts 32 form a bayonet coupling permitting secure locking of the cartridge 1 in the connector 2.
Furthermore, the connector 2 comprises an outer shell 34 extending beyond the inlet opening 28 of the casing 24. The outer shell 34 is tubular and attached to an end portion 24a of the casing 24. The purpose of the outer shell 34 is to protect the cartridge 1. The outer shell 34 may be made of a relatively rigid material, for instance as plastics or metal, such as stainless steel.
The casing 24 also comprises an aperture 35 extending through the casing 24 into the connection space 27. Furthermore, the connector 2 or the casing 24 comprises a holding member 36 configured to hold the pulse conduit 5 in a flow communication with the aperture 35 and the pulsating chamber 9 via the hole 18 for communicating a pulsating vacuum to the connection space 27 and to the pulsating chamber 9. The holding member defines a holding space, which is partly defined by a side wall 37 and a bottom wall 38. An opening 39 extends through the bottom wall 38.
The milk conduit 4, or short milk conduit, see also FIG. 3, is tubular and comprises a first end portion 4a defining a first end, a second end portion 4b defining a second end, and a conduit portion 4c between the first end portion 4a and the second end portion 4b. The milk conduit 4 defines a milk channel 40 extending through the first end portion 4a, the conduit portion 4c and the second end portion 4b. 
The first end of the milk conduit 4 may be defined or formed by a plane, or substantially plane, end surface from which the milk channel 40 extends.
The first end portion 4a of the milk conduit 4 has an external tapering shape from the first end to the conduit portion 4c. The milk conduit 4 thus has a greater outer diameter at the first end compared to the outer diameter at the conduit portion 4c. 
The first end portion 4a is configured to be received in the outlet opening 29 extending through the bottom wall 25 of the connector 2 of the teatcup. The first end portion 4a comprises a first circumferential groove 41 configured to engage the bottom wall 25, see FIG. 1. The first circumferential groove 41 is positioned at a distance from the first end and at a distance from the conduit portion 4c. 
The milk channel 40 of the first end portion 4a has an internal tapering shape from the first end towards the milk channel 40 of the conduit portion 4c. 
The second end portion 4b comprises a second circumferential groove 42, which is configured to be received in any suitable milk-receiving member or milk-collecting member, such as a claw, not disclosed. The second circumferential groove 42 is positioned at a distance from the second end and at a distance from the conduit portion 4c. Also the second end portion 4b has an external tapering shape from the second end to the conduit portion 4c. 
The milk conduit 4 is made of a hose material having a relatively high elasticity in the order of the elasticity of the first material of the barrel portion. For instance, the milk conduit 4 may be manufactured of natural rubber, black rubber, silicone rubber or Thermoplastic Elastomers, TPE. The conduit portion 4c comprises an bending area 43 having a locally decreased outer diameter, and thus a locally increased elasticity to provide a predetermined area for bending of the milk conduit 4.
Also the pulse conduit 5, see also FIG. 5, may be made of a hose material having a relatively high elasticity, possibly the same hose material as the material of the milk conduit 4. The pulse conduit 5 has a attachment end portion 5a to be engaged by the holding member 36. The pulse conduit 5 defines or encloses a pulse channel 51 extending along the pulse conduit 5 through the attachment end portion 5a. The attachment end portion 5a defines an opening 52 of the pulse channel 51. When the pulse conduit 5 is engaged by the holding member 36, the opening 52 is positioned opposite to the opening 35 through the casing 24.
The attachment end portion 5a is configured to be received in an opening extending through the bottom wall 38 of the holding member 36. The attachment end portion 51 has a bottom surface 53 configured to abut the bottom wall 38, see FIG. 1, when the pulse conduit 5 is mounted in the connector 2.
The assembling of the teatcup is now to be described. One assembling step is to produce the cartridge 1, wherein the teatcup liner 7 is mounted in the sleeve 6. This mounting may be made in advance in connection with the manufacturing of the teatcup. The teatcup liner 7 is then pulled through the sleeve 6, wherein the lower end portion 7b is introduced at the upper end 6a of the sleeve and pushed and pulled downwardly so that the lower end portion 7b passes the lower end 6b until the lower engagement member 14 snaps outwardly to abutment against the end surface of the lower end 6 of the sleeve 6. Thanks to the upper engagement member 15, the upper end portion 7a will not pass through the upper end 6a of the sleeve 6, but the engagement members 14 and 15 secure that the teatcup liner 7 and its barrel portion 7c is retained in a stretched state in the sleeve 6. In the stretched state, the teatcup liner 7 is prolonged in comparison with a rest state, in which the teatcup liner 7 is not subjected to any external forces, i.e. before the teatcup liner 7 is mounted in the shell 6.
Thereafter the lip member 3 may be attached to the cartridge 1, wherein the lip member 3 is pressed onto the upper end 6a of the sleeve 6 so that the snap connection 19 locks the lip member 3 in a detachable manner on the cartridge 1.
The cartridge 1 is a replaceable component, together with or without the lip member 3, depending on the wear of the lip 21. The cartridge 1 and the lip member 3 are the components of the teatcup that are subjected to significant wear.
A further assembling step is the assembling of the connector 1. The outer shell 34 may be mounted to the casing 24 in advance or after mounting of the milk conduit 5 and the pulse conduit 5. The milk conduit 4 is mounted to the connector 2 by the introduction of the second end portion 4b through the inlet opening 28 and then through the outlet opening 29. The milk conduit 4 is then pulled through the connector 2 until the lower wall 25 of the casing 24 snaps into the first circumferential groove 41. The tapering shape of the first end portion 4a facilitates the pulling of the milk conduit 4 into the snapping-in engagement.
In a similar manner, the pulse conduit 5 is mounted to the connector 2 by being pulled through the holding member 36 until the bottom surface 53 comes to abutment against the bottom wall 38, wherein the opening 52 of the pulse channel 51 is opposite to the opening 35 through the casing 24.
The teatcup is then present as two main components, namely the cartridge 1 together with the lip member 3, and the connector 2 together with the milk conduit 4 and the pulse conduit 5. The milk conduit 4 and the pulse conduit 5 may be mounted to their respective components of the remaining milking equipment in any suitable manner. The milk conduit 4 may for instance be mounted by engagement of the second circumferential groove 42.
Finally, these two main components are connected to each other. The cartridge 1, with or without the lip member 3, is then introduced into the connection space 27 of the connector 2 until the end nozzle 10 penetrates the milk channel 40 at the first end portion 41, and abuts tightly the wall of the milk channel 40. Thanks to the shape of the end nozzle 19 and to the relatively low elasticity of the end nozzle 10 in combination with the relatively high elasticity of the milk conduit 4 a tight connection is achieved.
In this position of the cartridge 1 vis-à-vis the connector 2, the end surface of the casing 24 will abut the sealing ring 17 so that the space formed between the sleeve 6 and the casing 24 is tightly sealed, thereby permitting proper communication of the pulsating vacuum. It is to be noted that the sealing ring 17 alternatively may be provided on the connector 2, especially on the casing 24.
When the cartridge 1 has reach this position vis-à-vis the milk conduit, the cartridge is locked in the connector 2, by means of the bayonet coupling, i.e. the coupling of the outer bayonet coupling part 31 and the inner bayonet coupling part 32. This coupling may be achieved through a turning of the cartridge 1 in relation to the connector 2. It is to be noted that the coupling and locking of the cartridge 1 to the connector 2 may also be achieved by other locking means, e.g. a thread connection.
The present invention is not limited to the embodiments disclosed but may be varied and modified within the scope of the following claims.
The terms “upper” and “lower” used in the description and the claims refer to the orientation disclosed in the figures and the approximate orientation when the teatcup is attached to the teat of an animal.
LIST OF REFERENCE SIGNS


    1 cartridge
    2 connector
    3 lip member
    4 milk conduit
    4a first end portion
    4b second end portion
    4c conduit portion
    5 pulse conduit
    5a attachment end portion
    6 sleeve
    6a upper end
    6b lower end
    7 teatcup liner
    7a upper end portion
    7b lower end portion
    7c barrel portion
    8 inner space
    9 pulsation chamber
    10 end nozzle
    11 lower permanent joint
    12 upper permanent joint
    14 lower engagement member
    15 upper engagement member
    17 sealing ring
    18 hole
    19 snap connection
    20 lip
    21 opening
    24 casing
    25 bottom wall
    26 surrounding wall
    27 connection space
    28 inlet opening
    29 outlet opening
    31 outer bayonet coupling part
    32 inner bayonet coupling part
    34 outer shell
    35 aperture
    36 holding member
    37 side wall
    38 bottom wall
    40 milk channel
    41 first circumferential groove
    42 second circumferential groove
    43 bending area
    51 pulse channel
    52 opening
    53 attachment circumferential groove

## Claims

1. A teatcup assembly, comprising:
i) a cartridge (1) comprising a sleeve (6) and a teatcup liner (7) mounted in the sleeve (6) thereby defining a) an inner space (8) for receiving the teat, and b) a pulsation chamber (9) between an inner side of the sleeve (6) and an outer side of the teatcup liner (7),
the sleeve (6) having an upper end (6a) and a lower end (6b),
the teatcup liner (7) comprising an upper end portion (7a) located at the upper end (6a) of the sleeve (6), a barrel portion (7c), and a lower end portion (7b) located at the lower end (6b) of the sleeve (6),
the barrel portion (7c) being an intermediate tubular portion provided between and adjoining the upper end portion (7a) and the lower end portion (7b) and being a main part of the teatcup liner (7) that is in contact with the teat of the animal during milking,
the lower end portion (7b) extending from a position within the sleeve (6) and including an end nozzle (10) that extends away from and beyond the lower end (6b) of the sleeve (6), the end nozzle (10) defining an outlet from the inner space (8), the end nozzle (10) having a decreasing tapered external shape and a decreasing tapered internal shape forming a decreasing tapered outlet for the milk from the inner space (8) of the teatcup liner (7);
ii) a connector (2) having an outer wall, and a bottom wall (25) with an outlet opening (29) extending through the bottom wall (25),
the sleeve (6) of the cartridge (1) being releasably locked to the connector (2), via a locking unit located on a) an inner surface of the connector (2) and b) an outer surface of the sleeve (6),
the teatcup having a longitudinal center axis (x) that extends through and along a longitudinal length of the teatcup including the cartridge and the connector; and
iii) a milk conduit (4) that transports milk received from the end nozzle (10), the milk conduit (4) comprising
a) a first end portion (4a) defining a first end connected to the connector (2), the first end portion (4a) comprising an outward facing first circumferential groove (41) snap fit onto and engaging an inward facing edge of the bottom wall (25) that defines the outlet opening (29) such that the outlet opening (29) receives the outward facing first circumferential groove (41) and holds the milk conduit (4) extending through the outlet opening (29),
b) a second end portion (4b) defining a second end, and
c) a conduit portion (4c) located between the first end portion (4a) and the second end portion (4b),
wherein the milk conduit (4) defines a milk channel (40) extending through the first end portion (4a), the conduit portion (4c), and the second end portion (4b),
wherein the first end portion (4a) further includes
i) an external surface with a decreasing tapered external shape from the first end toward the conduit portion (4c), the first circumferential groove (41) being located along the decreasing tapered external shape of the external surface, wherein the decreasing tapered external shape of the external surface facilitates mounting of the milk conduit by a pulling movement to snap fit the first circumferential groove (41) onto and engaging the edge of the bottom wall (25) at the outlet opening (29), and
ii) an internal surface with a decreasing tapered internal shape from the first end towards the conduit portion (4c),
wherein the first circumferential groove (41) is located, in a cross section of the first end portion, surrounding internal surface with the decreasing tapered internal shape,
wherein the decreasing tapered external shape of the end nozzle (10) is received in the internal surface with the decreasing tapered internal shape of the first end portion (4a) of the milk conduit (4), and
wherein internal surface with the decreasing tapered internal shape of the first end portion (4a) provides a radial seal with the decreasing tapered external shape of the end nozzle (10) received therein with the decreasing tapered external shape of the end nozzle (10) penetrating in tight abutment with the internal surface with the decreasing tapered internal shape of the first end portion (4a) of the milk conduit (4).

2. The assembly according to claim 1, wherein the first circumferential groove (41) is positioned at a distance from the first end and at a distance from the conduit portion (4c) so that first circumferential groove (41) is located intermediate the first end and the conduit portion (4c).

3. The assembly according to claim 1, wherein the second end portion (4b) comprises a second circumferential groove (42).

4. The assembly according to claim 3, wherein the second circumferential groove (42) is positioned at a distance from the second end and at a distance from the conduit portion (4c).

5. The assembly according to claim 1, wherein the second end portion (4b) has an external tapered shape from the second end to the conduit portion (4c).

6. The assembly according to claim 1, wherein the milk conduit (4) is comprised of a hose material having a relatively high elasticity.

7. The assembly according to claim 6, wherein the conduit portion (4c) comprises a bending area (43) having a locally increased elasticity that defines a predetermined area for bending of the milk conduit (4).

8. The assembly according to claim 1, wherein,
the connector (2) further comprises a casing (24), which defines a longitudinal center axis (x) and comprises
i) the bottom wall (25),
ii) the inner surface, the inner surface being located above the bottom wall and defining a connection space (27),
iii) an inlet opening (28) located above and opening to the connection space (27), and
iv) the outlet opening (29) extending through the bottom wall (25) and receiving and holding the milk conduit (4).

9. The assembly according to claim 8, wherein the bottom wall (25) is a plane surface.

10. The assembly according to claim 8, wherein the bottom wall (25) extends perpendicularly to the longitudinal center axis (x).

11. The assembly according to claim 8, wherein the casing (24) is made of a shell material having a high stiffness relative to the teatcup liner, and a low elasticity relative to the teatcup liner.

12. The assembly according to claim 8, wherein,
the locking unit comprises i) outer bayonet coupling parts (31) located on the inner surface of the connector (2), and ii) inner bayonet coupling parts (32) located on the outer surface of the sleeve (6), the outer and inner bayonet coupling parts (31, 32) together forming a bayonet coupling that locks the inner surface of the connector (2) to the outer surface of the sleeve (6) of the cartridge (1).

13. The assembly according to claim 1, wherein,
the connector (2) further comprises
a casing (24), which defines a longitudinal center axis (x) and comprises i) the bottom wall (25), ii) the inner surface, the inner surface being located above the bottom wall and defining a connection space (27), iii) an inlet opening (28) located at a topmost edge of an end portion (24a) of the casing above and opening to the connection space (27), and iv) the outlet opening (29) extending through the bottom wall (25) and receiving and holding the milk conduit (4), and
an outer shell (34) extending beyond the inlet opening (28) of the casing (24), overlapping an outside part of the topmost edge of the casing (24), and attached to the end portion (24a) of the casing (24).

14. The assembly according to claim 13, wherein
the locking unit comprises outer bayonet coupling parts (31) located on the inner surface of the connector (2), and
the sleeve (6) comprises inner bayonet coupling parts (32) forming a bayonet coupling with the outer bayonet coupling parts (31) located on the inner surface of the connector (2).

15. The assembly according to claim 13, wherein the lower end portion (7b) of the teatcup liner (7) comprises a lower annular engagement member (14) extending outward and having an upper surface in abutment with a lowermost edge of the lower end (6b) of the sleeve (6) such that the barrel portion (7c) of the teatcup liner (7) is maintained in a stretched state in the sleeve (6).

16. The assembly according to claim 8, wherein the lower end portion (7b) of the teatcup liner (7) comprises a lower annular engagement member (14) extending outward and having an upper surface in abutment with a lowermost edge of the lower end (6b) of the sleeve (6) such that the barrel portion (7c) of the teatcup liner (7) is maintained in a stretched state in the sleeve (6).

17. The assembly according to claim 1, wherein the lower end portion (7b) extends beyond the lower end (6b) of the sleeve (6) into the outlet opening (29) extending through the bottom wall of the connector (2).