Device for connecting a discharge tube and a return tube to a bung of a liquid container

ES 2 201 404 T3

DESCRIPTION

Device for connecting a discharge tube and a return tube to a screw cap of a container for liquid.

The invention refers to a device for connecting at least one discharge tube and one return tube to a connection in the lid of a container for liquids and the like, said connection being incorporated with an internal thread, the device of which consists of:

- a threaded cylindrical insert piece arranged on the outer wall of the cylinder and acting jointly with the cover, in addition to a base provided with at least two openings;

- a cover that connects a tube to be placed with the lower surface on this base and provided with passages for the discharge tube and the return tube aligned with these openings; Y

- a clamping piece to fix the connection cover on the cylindrical piece inserted by means of connections, where projections are arranged in a certain shape and cavities to receive these projections.

Such a device has already been described in the applicant's Dutch patent application 9400563 or in document US 4699298A.

Such a connection device serves to discharge liquid from the container, where it is recommended to code the connection of the cap so that it only fits in a container with a predetermined liquid. Used for this purpose are the projections and cavities that co-operate with these projections which ensure that only a certain connection device fits over a certain container insert. The insert is fitted by the supplier of the liquid.

The drawback of the existing device is that different components are arranged independently of each other, which in practice can lead to errors.

The object of the invention is to overcome the aforementioned drawback and provides for this purpose a device that is distinguished in that the clamping piece is connected in such a way that it cannot slide in the axial direction with the cap but that it can rotate freely relative to it, where the connection means in the insert are arranged at a distance from the base in order to form a chamber, the cavities are positioned above the chamber in the insert and the projections are in a downwardly extending portion of the clamping piece and at a distance below the connecting means.

Due to the fact that the connection of the clamping piece can rotate with respect to the cap, where axial movement is not possible, and to the particular arrangement of the projections and the cavities that act together with them, the possible wrong connection above is avoided. mentioned. The cap with cap connections can, however, rotate freely relative to the insert.

An embodiment of the invention is further explained in the figure description below in more detail. The attached figure shows the device in perspective with the parts partially torn away and separated.

Designated with the number 1 is the liquid container, of which only the upper wall is shown schematically. In a cavity of the upper wall there is an opening 2 into which a cover hole 3 provided with a thread is connected. An insert 4 which is provided with a jointly acting thread 5 is placed in this cover hole.

The insert is made with a through opening 6 and a second hole 7, of which its operation and function will be explained later. In the inner cylindrical part there is a thread 9 at a distance from the base 8 of the insert, such that between the thread 9 and the base there is a free space 10 that forms a chamber, the object of which is explained later.

On the insert 4 there is placed a cover 11 provided with a connection 12 for a discharge tube and a hole 13 running from the top to the base.

The lid 11 has a channel-shaped cavity 14 on its outer peripheral surface.

At the bottom end there is furthermore a flange 15 pointing outwards.

Around the cover 11 a clamping piece 16 has been placed that carries an annular flange 17 in the annular lower part, which fits into the annular channel 14 of the cover 11. The distance between the annular flange 17 and the lower side of the The cylindrical part 19 of the clamping piece 16 is such that the latter ends directly above the projecting flange 15 of the lid.

Due to the connection formed by the channel 14 and the projecting flange 17, the clamping piece 16 can rotate in the direction of the arrow P1 relative to the cover 11 but cannot slide in the axial direction. Once assembled, the clamping piece 16 remains fixed on the cover 11.

According to the invention, projection means 20, 21, which are located on the outer cylindrical wall of the clamping piece 16, are arranged under the thread 22 arranged therein.

Also arranged on the inside of the insert 4, near the thread 9, are two cavities 23, 24, the distance between them corresponding to the distance between the projection means 20, 21. The width of the recesses 23, 24 it also corresponds to the relevant widths of the projections 20, 21.

To position the cap 11 on the insert 4, the assembly of the cap 11 and the clamp 16 is inserted into the cylindrical opening of the insert 4. For this purpose the clamp 16 is rotated in the direction of the arrow P1 by means of the clamping ring 25 directed upwards, in such a way that the projections 20, 21, face the cavities 23, 24. The assembly can then be moved downwards in the direction of the arrow P2, where the projections 20, 21 move under the thread 9 in the space 10 of the insert 4. The clamping piece 16 can therefore rotate freely relative to the cap 11 and relative to the insert 4. Another twist can occur such that the thread 22 enters the thread 9, where then the clamping piece 16 can be firmly screwed into the insert 4. The lid 11 is thus fixedly tightened in the discharge hole of the liquid container 1.

Before being fully tightened, the cap can continue to rotate freely, so no reaction or torsional forces are generated in the discharge tube attached to the cap connection.

A later option is a check valve 30 in the passage of the connection 12 of the cover 11.

A pressure spring 31 presses the valve 30 downwards and closes the opening of the cover 12 in the direction

ES 2 201 404 T3 down. During placement, the rear piece 33 of the valve 30 will go up against a stop 34 in the passage 6 of the insert 4, where the valve is lifted from its seat by the placement of the cap 11.

It has been noted that in order to purge, the opening 13 in the lid 11 communicates with the hole 7 through an annular chamber 34 in the insert 4.

Coupling gaskets 35 ensure a separation between the liquid passage and the purge through the cover.

It should also be noted that other embodiments are possible within the scope of the invention. The placement of the projections 20, 21 and associated cavities 23, 24, of course, serve as an example only and a completely different coding can be used with a different location and width of the projections 20, 21.