SECURING DEVICE FOR A REMOVAL FITTING

Abstract

The invention relates to a securing device for the placement of a tapping armature (10) on a tapping neck (11) formed integrally on a container wall (13) of a plastic container (12), the tapping armature (10) having an armature housing (20) comprising a screw flange (18) which has an internal thread (17) for being screwed to an external thread (16) formed on a threaded extension (15) of the tapping neck (11), a securing ring (28) being disposed between the container wall (13) and the screw flange (18), said securing ring (28) having locking protrusions (37) for forming a locking means (36) which are disposed on an inner circumference and directed radially inward and whose locking ends for locking with a stop means (48) formed on the container (12) are disposed on a locking circumference (53), whose diameter D is greater than the diameter d of the external thread (16) of the tapping neck (11) or equal to said diameter d.

Claims

1. A securing device for the placement of a tapping armature (10) on a tapping neck (11) formed integrally on a container wall (13) of a plastic container (12), the tapping armature (10) having an armature housing (20) comprising a screw flange (18) formed concentrically with a plastic inlet neck (19) on said inlet neck (19), the screw flange (18) having an internal thread (17) for being screwed to an external thread (16) formed on a threaded extension (15) of the tapping neck (11) in such a manner that the tapping neck (11) engages into an annular neck receiving space (33) formed between the inlet neck (19) and the screw flange (18), a securing ring (28) being disposed between the container wall (13) and the screw flange (18), the securing ring (28) adapted for connecting to the screw flange (18) and a lock (36) for connecting it to the container (12), the securing ring (28) having locking protrusions (37) for forming the lock (36) which are disposed on an inner circumference and directed radially inward and whose locking ends (52) for locking with a stop (48) formed on the container (12) are disposed on a locking circumference (53), whose diameter D is greater than the diameter d of the external thread (16) of the tapping neck (11) or equal to said diameter d.

2. The securing device according to claim 1, wherein an axial stop (34) for coming into contact with a front end (35) of the tapping neck (11) is formed in the neck receiving space (33).

3. The securing device according to claim 1, wherein the stop (48) is formed on a neck base (14) of the tapping neck (11) formed adjacent to the container wall (13).

4. The securing device according to claim 3, wherein the neck base (14) is realized as a collar formed in the area of transition from the container wall (13) to the threaded extension (15) of the tapping neck (11), said collar having latching protrusions distributed across its circumference, each latching protrusion having a latching surface (51) which extends substantially parallel to a longitudinal axis of the tapping armature (10).

5. The securing device according to claim 4, wherein the latching protrusions are realized as latching ramps (49) having a ramp surface (50) which rises from the circumference of the neck base (14) and which forms a latching shoulder with the latching surface (51).

6. The securing device according to claim 1, wherein the length of the tapping neck (11), the design of the external thread (16) on the tapping neck (11), and the distribution of the latching protrusions (43) at the circumference of the neck base (14) are selected such that when the axial stop (34) of the armature housing comes into contact with the front end (35) of the tapping neck (11) with a defined preload force, at least one locking protrusion (37) of the lock (36) of the securing ring (28) elastically latches behind the latching surface (51) of a latching protrusion (43).

7. The securing device according to claim 1, wherein in order to form a radially acting seal (55), a sealing space (59) is formed which has an inner sealing surface (56), which is formed by an outer wall (32) of the inlet neck (19), and an outer sealing surface (58), which is formed by an inner wall (57) of the tapping neck (11), and which is provided with an O-ring seal (30) accommodated in the sealing space (59) so as to come into contact with the inner sealing surface (56) and with the outer sealing surface (58).

8. The securing device according to claim 7, wherein for forming the sealing space (59), a circumferential recess (60) is formed at an inner opening edge at the front end (35) of the tapping neck (11) in such a manner that a limiting surface (62) which axially limits the sealing space (59) and which is axially recessed relative to a stop surface (61) which serves to come into contact with the axial stop (34) of the neck receiving space (33) is formed by the recess (60).

9. The securing device according to claim 7, wherein the inner sealing surface (56) and/or the outer sealing surface (58) conically taper in the axial direction in such a manner that the height of the of the sealing space (59) decreases in the direction of the tapping neck (11).

10. The securing device according to claim 1, wherein the the securing ring (28) includes a driver pocket (29) formed at a front side (40) of the securing ring (28), said front side (40) facing the screw flange (18), said driver pocket (29) serving to be engaged by a driver tab (27), which is formed on the screw flange (18), in such a manner that the tapping armature (10) and the securing ring (28) are disposed coaxially when driver tab (27) is engaged in the driver pocket (29) in a form-fitting manner.

11. The securing device according to claim 10, wherein in addition to the driver pocket (29), the securing ring (28) has at least one other driver element (41) which allows a torque to be transmitted from the screw flange (18) to the securing ring (28) in the mounting direction (39) only.

12. The securing device according to claim 11, wherein the driver element (41) has a radial stop surface (45) serving to come into contact with a web flank (46) of a driver web (47) which is formed on the screw flange (18) and which extends in the axial direction.

13. The securing device according to claim 12, wherein the driver element (41) has a latching protrusion (43) for axially latching on a mating latching element (44) formed on the screw flange (18) so as to fix the securing ring (28) to the screw flange (18) in a coaxial mounting position.

14. The securing device according to claim 1, wherein the driver pocket (29) is configured as a tamper-evident element in such a manner that a visible wall (64) connected to a base wall (64) formed on the securing ring (28) via a predetermined break (66, 67) is provided, a receiving space (65) for the driver tab (27) of the screw flange (18) being formed between the base wall (63) and the visible wall (64) so as to form the driver pocket (29).

15. The securing device according to claim 14, wherein the visible wall (64) has at least two visible-wall portions (69, 70) connected to the base wall (63) via the predetermined break (66, 67), the front visible-wall portion (69) in the dismounting direction (38) of the screw flange (18) having a stop edge (71) for the driver tab (27) and the rear visible-wall portion (70) in the dismounting direction (38) having a stop edge (78) for a following driver web (47) of the screw flange (18) in the dismounting direction (38).

Description

[0026] Hereinafter, a preferred embodiment of the securing device is explained in more detail based on the drawing.

[0027] FIG. 1 shows an isometric view of a tapping armature mounted on a tapping neck of a container;

[0028] FIG. 2 shows another view of the tapping armature illustrated in FIG. 1;

[0029] FIG. 3 shows the tapping armature as illustrated in FIGS. 1 and 2 in a mounting configuration with a securing ring placed on a screw flange;

[0030] FIG. 4 shows the tapping armature as illustrated in FIG. 2 in a partial section view according to section line IV-IV in FIG. 2;

[0031] FIG. 5 shows an enlarged part of FIG. 4;

[0032] FIG. 6 shows a securing ring placed on the tapping neck of the container;

[0033] FIG. 7 shows a top view of the securing ring illustrated in FIG. 6;

[0034] FIG. 8 shows an isolated view of the securing ring illustrated in FIG. 6;

[0035] FIG. 9 shows an isometric illustration of the securing ring illustrated in FIG. 8.

[0036] In FIGS. 1, 2 and 4, a tapping armature 10 mounted on a tapping neck 11 of a plastic container 12 is illustrated. Plastic containers 12 of this kind are used in particular as inner containers of intermediate bulk containers (IBCs), the plastic containers 12 in this case being accommodated in a protective shell which is fixed on a transport pallet and often configured as a cage.

[0037] As shown in FIG. 3, in particular, the tapping neck 11 is located at a container wall 13 of the plastic container 12 and has, directly adjacent to the container wall 13, a collar-shaped neck base 14, adjacent to which a threaded extension 15 is formed, said threaded extension 15 having an external thread 16 which serves to be screwed to an internal thread 17 of a screw flange 18 which is formed on an inlet neck 19 of an armature housing 20 of the tapping armature 10.

[0038] The armature housing 20 is provided with a valve which, in the case at hand, is realized as a flap valve 21 and which has a valve flap 23 disposed on a valve shaft 22, said valve flap 23 having a valve handle 24 at its end protruding from the armature housing 20 in such a manner that the valve flap 23 can be displaced from the closed position illustrated in FIG. 3 into an open position (not illustrated) by pivoting the valve shaft 22 by means of the valve handle 24. An outlet neck 25 of the armature housing 20 is provided with a screw cap 26 to protect the tapping armature 11 against dirt.

[0039] FIG. 3 shows the tapping armature 10 in a mounting configuration in which the screw flange 18, which is formed integrally on the armature housing 20 and made of the same material as the inlet neck 19, is connected to a securing ring 28 via a driver tab 27 radially projecting from the screw flange 18. To connect the securing ring 28 to the driver tab 27 of the screw flange 18, the securing ring 28 has a driver pocket 29 into which the driver tab 27 form-fittingly engages, which means that during mounting, the securing ring 28 together with the tapping armature 10 is coaxially aligned relative to the tapping neck 11 and forms a mounting unit with the tapping armature 10 which can be screwed onto the tapping neck 11.

[0040] As FIG. 3 further shows, when the tapping armature 10 is in the mounting configuration on the inlet neck 19, the armature housing 20 is provided with an O-ring seal 30 which is disposed on an outer wall 32 of the inlet neck 19, said outer wall 32 conically tapering toward a neck end 31, and which thus forms another component of the mounting unit.

[0041] FIG. 4 shows the tapping armature 10 after having been mounted on the tapping neck 11 in a use configuration connected to the plastic container 12, in which the screw flange 18 is screwed on far enough for an axial stop 34 formed at the bottom of an annular neck receiving space 33 formed between the inlet neck 19 and the screw flange 18 to come into contact with a front end 35 of the tapping neck 11 until the desired mounting preload force is achieved.

[0042] As can be seen from a combined view of FIGS. 8 and 9, the securing ring 28 is provided with a locking means 36 at its inner circumference, said locking means 36 having a plurality of locking protrusions 37 which are directed radially inward and which, in the embodiment example illustrated here, additionally have an orientation inclined at a latching angle relative to the radius r in the in the dismounting direction 38. Furthermore, at its front side 40 facing the screw flange 18 in the mounting position illustrated in FIG. 3, the securing ring 28 has two driver elements 41 which are oriented axially and each of which has, at a driver end 42, a latching protrusion 43 which, as shown in FIG. 2 in particular, serves to latch with a web edge 44 of the screw flange 18.

[0043] Moreover, the driver elements 41 have a radial stop surface 45 which serves to come into contact with a web flank 46 of a driver web 47 which is formed on the screw flange 18 and which extends in the axial direction.

[0044] In the mounting configuration of the tapping armature 10 as illustrated in FIG. 3, the securing ring 28 is fixed in both its radial and axial relative position relative to the screw flange 18 by the driver tab 27 of the screw flange 18 being received in the driver pocket 29 of the securing ring 28 and by the driver elements 41 being latched, as also illustrated in FIG. 2. This results in a corresponding coaxial alignment of the securing ring 28 with the tapping armature 10, which means that the tapping armature 10 can be screwed onto the tapping neck 11 together with the securing ring 28 and with the O-ring seal 30 mounted on the inlet neck 19 of the armature housing 20 in the neck receiving space 33 as a mounting unit.

[0045] As shown in FIG. 3, the neck base 14 of the tapping neck 11 is provided with a stop means 48 which, in the case at hand, has four latching protrusions which are distributed across the circumference of the neck base 14 and realized as latching ramps 49. The latching ramps 49 have a ramp surface 50 which rises from the circumference of the neck base 14 and ends with a latching surface 51 at a latching shoulder.

[0046] As can be seen from a combined view of FIGS. 6 and 7, which, in order to explain the interaction of the locking means 36 of the securing ring 28 with the stop means 48 formed on the tapping neck 11, show the securing ring 28 disposed on the tapping neck 11 in an illustration separate from the tapping armature 10, locking ends 52 of the locking protrusions 37 of the securing ring 28 are disposed on a locking circumference 53 whose diameter D is greater than the diameter d of the external thread 16 formed on the tapping neck 11. This allows the securing ring 28 mounted on the tapping armature 10 to form the mounting unit to be screwed onto the tapping neck 11 together with the tapping armature 10 without the locking protrusions 37 of the securing ring 28 colliding with a ridge 54 of the external thread 16 and thus potentially affecting the coaxial alignment of the tapping armature 10 with the tapping neck 11 as required for screwing.

[0047] As shown in FIG. 3, in the embodiment example illustrated, the stop means 48 has the latching ramps 49 positioned in such a manner that the distance between the stop means 48 and the front end 35 of the tapping neck 11 is substantially equal to the length 1 of the tapping neck 11. The length 1 of the tapping neck 11 and the design of the external thread 16, i.e. in particular the radial position of a start of the ridge 54 and the pitch of the ridge 54, and the position of the latching surfaces 51 of the stop means 48 in relation to the position of the locking ends 52 on the locking circumference 53 of the securing ring 28 are selected such that, as shown in FIG. 4, when the axial stop 34 of the armature housing 20 is in contact with the front end 35 of the tapping neck 11, the armature housing 20 is in contact with the tapping neck 11 with a defined preload force while the locking ends 52 of the locking means 36 of the securing ring 28 are elastically latched behind the latching surfaces 51.

[0048] Thus, it is ensured that once the securing ring 28 is latched with the stop means 48, a defined preload force is transmitted from the armature housing 20 to the tapping neck 11.

[0049] As can be seen from a combined view of FIGS. 4, 5 and 6, to form a radially acting sealing means 55, an inner sealing surface 56 formed by the outer wall 32 of the inlet neck 19 and an outer sealing surface 58 formed by the inner wall 57 of the tapping neck 11 are provided, which radially limit a sealing space 59. For axially limiting the sealing space 59, which serves to receive the O-ring seal 30, a circumferential recess 60 is formed on an inner opening edge at the front end 35 in such a manner that a limiting surface 62 which axially limits the sealing space 59 and which is axially recessed relative to a stop surface 61 formed at the front end 35 and serving to come into contact with the axial stop 34 of the neck receiving space 33 is formed by the recess 60.

[0050] In the case at hand, to support the radial sealing effect, the outer sealing surface 58 formed by the inner wall 57 of the tapping neck 11 tapers conically in the axial direction in such a manner that the height of the sealing space 59 decreases in the mounting direction 39 of the tapping armature 10.

[0051] As shown in FIG. 9 in particular, to configure the driver pocket 29 as a tamper-evident element, a base wall 63 formed on the securing ring 28 is connected to a visible wall 64 disposed opposite the base wall 63 via a first predetermined breaking means 66 and a second predetermined breaking means 67, a corresponding axial distance a being provided between the base wall 63 and the visible wall 64 in order to form a receiving space 65 of the driver pocket 29.

[0052] As FIG. 9 further shows, the visible wall 64 has two visible-wall portions 69, 70, which are connected to each other via another predetermined breaking means 68. As can best be gathered based on the illustration in FIG. 1, the driver tab 27, which is realized as a tamper-evident element, is destroyed if the tapping armature 10 is turned in the dismounting direction 38 because, first, a stop edge 71 formed on the front visible-wall portion 69 is caught by the driver tab 27, which penetrates a radial recess 72 of the driver pocket 29 when turned in the dismounting direction 38, and connecting webs 73, 74 of predetermined breaking means 66 and connecting webs 75, 76 of predetermined breaking means 68 are destroyed, the front visible-wall portion 69 thus being removed from the securing ring 28. If the tapping armature 10 continues to be turned in the dismounting direction 38, a stop edge 78 formed on the second visible-wall portion 69 is caught by the driver web 47 of the screw flange 18 following the driver tab 27, causing connecting webs 79, 80, 81 and 82 of the predetermined breaking means 66 to rip off and the second visible-wall portion 69 to be removed from the securing ring 28 as well.