DE29807448U1 - Sanitary hose - Google Patents

Description

Dlpl.-Ing. Josef Boclehornl, Munich J * . . *

Dipl.-Phys. Dr. Frank Schorr, Munich · · . ·

Oldoplast plastic profiles
GmbH & Co. KG.
Hülsbergstrasse 255

45772 Mari

Herne

20.04.1998

(Bo/Rü/Ra)

Sanitary hose

The invention relates to a sanitary hose with a molded-on connector made of plastic, which has a radial flange coaxial to the hose, with which the hose is connected to a fitting by means of a union nut.

The preferred application area of the invention is sanitary hoses that are used to connect a hand shower to a bathroom fitting. Simple hoses and those with a multi-layered structure made of plastic are known, the latter being reinforced with a fabric insert.

With such plastic hoses, a plastic sleeve is inserted into the inside of the hose at each end, for example, which has a radial flange that protrudes beyond the outside of the hose. To attach the plastic sleeve, a chrome-plated sheet metal sleeve, for example, is inserted into the outer casing of the hose, which is pulled onto the plastic hose, which is slightly expanded by the inserted plastic sleeve, and thus sits firmly on the end section of the hose.

Forstenrieder Allee 59 Schaefersfrasse 18 Hainstrasse 20/24 Paseo Explanada De Espana No.3

D-8147&oacgr; Munich D-44623 Heme D-04109 Leipzig ES-03002 Alicante

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The attachment to a fitting is then carried out by means of a sleeve-shaped union nut, also e.g. chrome-plated, which is provided with an internal thread and can be screwed onto the water connection or hand shower, which has a corresponding external thread, and which, in its fastening position, rests with its inner shoulder on the radial flange of the plastic sleeve.

These well-known plastic hoses are useful in themselves because they are relatively light and flexible, but the known connecting parts are not leak-proof in the long term because the connecting parts are subjected to a great deal of stress due to the temperature changes on the one hand and the different materials (metal/plastic) reacting differently to them on the other hand, which is further increased by the constant tensile stress during use.

In addition, there are also mostly chrome-plated metal hoses, where a metal sleeve with a tight fit and a radial flange is attached to the end of the hose as a connecting part. Here too, the union nut rests on this radial flange, which holds the metal hose to the water connection. With metal hoses, it has also been shown that the fastening method cannot satisfactorily withstand the stresses that occur during use.

Furthermore, another variant of fastening the connecting parts is known, namely, these are attached to the ends of both plastic and metal hoses by injection molding from moldable plastic.

For example, DE-OS 26 54 377 discloses a plastic hose that has spiral-shaped cavities in its wall into which the material of the connecting part is injected. However, this attachment of the connecting part can lead to leaks after a relatively short period of use, since the cavity can expand when the connecting part is injected.

Furthermore, DE-PS 30 49 501 discloses a plastic sanitary hose with an injection-molded plastic connector, in which a firm connection between the hose and the connector is achieved by means of a positive connection. To this end, several extensions formed as one piece with the connector engage in corresponding recesses in the hose, with the recesses being expediently formed by blind holes distributed around the circumference of the hose end. This design of the connector has proven itself in practice, as it largely eliminates the risk of tearing due to tensile stress.

Based on the prior art shown, the invention is based on the object of creating a sanitary hose with a connecting part that can be produced inexpensively as a mass-produced item, but is nevertheless reliable in terms of tightness and tear resistance with regard to the connecting part.

The invention solves this problem by means of a radial flange which is essentially welded integrally to the front side of the sanitary hose.

In addition, in the case of a sanitary hose that has a multi-layer structure and is reinforced by a central fabric insert, it is advantageous that the radial flange is held or interlocked by plastic that has penetrated into the fabric insert at the front when the connecting part is molded on.

It is also advantageously possible for the radial flange to be additionally held by a thin-walled overlap that is integral with it over the inner and/or outer circumference of the hose, whereby it may be sufficient if the overlap is only partially provided on the inner and/or outer circumference of the hose.

In the case of a metal hose that has spiral grooves on its outer casing and in which a plastic hose is loosely inserted, it is expedient according to the invention to additionally provide the radial flange with a sleeve-like overlap

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which then engages positively with the metal hose, whereby it is additionally possible that the radial flange is also held by a thin-walled overlap, which is integral with the radial flange, over the inner circumference of the · ^! inserted plastic hose.

As a particularly advantageous measure, the invention provides that flexible, radially protruding noses are provided on the outer circumference of each radial flange, the ends of which lie in an enveloping circle whose diameter corresponds approximately to the inner thread diameter of the sleeve-shaped union nuts. In this case, it is quite sufficient for each radial flange to have only two noses, which are arranged diametrically.

The molded-on noses have the great advantage that when the union nut and connecting part are put together, they engage or snap into the threads of the union nut, which ensures that the union nut and the radial flange are held together in a detachable manner. This means that the union nuts are offered ready for assembly and do not get lost during storage and transport. This also simplifies packaging, i.e. there is a sales unit in which parts that belong together are fixed together in a way that is suitable for transport and storage.

Finally, in a further embodiment, the invention proposes that the front end of the hose adjacent to the radial flange be designed in a compressed manner, whereby the molded-on connecting part engages behind this compression in a form-fitting manner. This increases the strength against tensile stress in particular.

Further details and advantages of the invention are explained and described in more detail below by means of embodiments based on the drawing. It shows.

Fig.1 the hose end of a plastic hose, partially cut open in the area of a connection part, with the upper half opposite the lower

Half another variant for fixing a radial flange
illustrated, ;

Fig.2 a section through the hose end of a plastic hose with

multi-layer structure and part of a sleeve-like union nut; and

Fig.3 the hose end of a metal hose, partially cut open in the ·.:..· area of a connecting part, where the radial flange is provided with lugs. \. ^: . ^:

In Fig.1, a sanitary hose made of plastic, in particular PVC, is generally shown at 1, to the end of which a connecting part 2, which is also made of plastic, is welded internally by injection molding. Such a sanitary hose is used, for example, as a shower hose, with the connecting part 2 being connected, for example, to a water connection together with a sleeve-like union nut (not shown in this figure). For this purpose, the connecting part 2 has a radial flange 3 which is arranged coaxially to the hose 1. The radial flange 3 is welded integrally to the front side of the plastic hose 1 during the injection molding process, which is indicated in the lower half of Fig.1 at 10. In addition to this fixation, a thin overlap 4 or 4' can also be provided, which is formed integrally with the radial flange 3 during the injection molding process. In Fig. 1, an over-grip 4 extends over the inner circumference and an over-grip 4' extends over the outer circumference of the sanitary hose 1. It must be noted that the thickness of these over-grips 4, 4' may only be relatively thin (approximately the thickness of a film), since the over-grip 4 in the inner circumference in particular may not noticeably narrow the clear passage of the hose.

In the upper part of Fig. 1, a further variant is illustrated how a fixation of the connecting part 2 can be improved in such a way that this

is particularly resistant to additional loads. For this purpose, the front end of the hose 1 adjacent to the radial flange 3, designated 23,

formed in a compressed manner so that the molded-on connecting part 2 positively engages behind this compression marked 24.

Fig. 2 shows an alternative embodiment to Fig. 1, which is a plastic hose 1' with a multi-layer structure. Here, 5 designates an inner hose made of PVC, on which a fabric insert 8 is arranged. This can be formed from diagonally arranged fabric threads and longitudinal threads, with a middle layer 6 and an outer layer 7 adjoining them.

Analogous to Fig. 1, a connecting part 2' is again welded to the end of the hose, namely by injection molding, the connecting part 2' being expediently made of polyurethane. The connecting part 2' is manufactured in production by placing the hose V with the inner hose 5 on a mandrel, after which a mold is closed which overlaps the end of the hose from the outside, into which the liquid plastic material, here polyurethane, is then injected by injection molding and the connecting part 2' is thus formed. In this case, an integral welding with the radial flange 3' takes place, in particular on the end faces 10' of the inner hose 5, the middle and outer layers 6, 7, as already explained in connection with Fig.1, whereby a further fixation of the radial flange 3' to the end of the sanitary hose V used as a shower hose, for example, is achieved by the polyurethane material penetrating the fabric insert 8, indicated at 9, which creates a kind of interlocking. This results in a very close connection between the connection part 2' and the hose end, which gives the sanitary hose a relatively long service life.

In Fig.2, flexible, radially protruding noses (11) are also shown on the outer circumference of the radial surface 3', the ends of which lie in an enveloping circle 22, the diameter of which corresponds approximately to the inner thread diameter, designated 13, of the partially shown

sleeve-shaped union nut, designated 12. These lugs 11 snap into the radial flange 3 1 when the union nut 12 is placed on the radial flange 3 ¹ .

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Internal thread 13 of the union nut 12 and serve advantageously as a holder for a prepared assembly and as a kind of transport packaging, so that the union nut is not lost during transport and storage.

It should be remembered that such sanitary hoses as shower hoses are usually passed on to the end user via wholesalers or hardware stores, so that the complete unit consisting of hose and union nuts held at the ends comes into circulation, which is why the fixation with the lugs 11 described above represents a real advantage.

Finally, in Fig. 2, 14 indicates another attached sleeve, which is provided solely for optical reasons and which, when assembled, also rests with its flange on the radial flange 3'. This sleeve 14, which serves purely optical purposes, is pushed onto the outer casing 7. This sleeve 14 is normally required for a conventional plug-type nipple, because it generates the necessary counterpressure for the nipple used. However, it has been shown that consumers are used to these attached sleeves, so that in the case of the injection-molded or welded connection part, these sleeves can be used purely out of habit, but are dispensable from a technical point of view.

Furthermore, the choice of polyurethane material for the connecting part makes it possible to dispense with conventional sealing rings, which represents a further advantage for the end user.

Fig.3 shows a sanitary hose 1", in particular a shower hose, which is formed from an outer metal hose 16 provided with spiral grooves, inside which a plastic hose 17, in particular made of PVC, is loosely and movably arranged. Metal hose 16 and plastic hose 17 inserted or inserted into it are not connected to each other over the circumference, whereby the

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Flexibility is ensured despite the different choice of material, while the hose is pressure-resistant and kink-free. However, the connection is made at both ends of the shower hose via a connector 2" welded or cast on by injection molding, which protrudes with the radial flange 3" beyond the outer circumference of the metal hose 16. On the outer circumference, as can be seen from Fig. 3, two oppositely arranged lugs 11" are formed, which also serve to hold a sleeve-like union nut placed on the ends of the shower hose, which is not shown in Fig. 3. Of course, the opposite arrangement and the selection of just two lugs is purely exemplary, without the invention being restricted to this.

As can be seen from Fig. 3, left illustration, the connecting part 2" extends a short distance like a sleeve at 18 over the metal hose 16, whereby the injection molding ensures a bonding with the metal hose, but in particular also a positive connection 21 through engagement of the plastic material in the spiral grooves of the metal hose 16. In the area of the inner plastic hose 17, a very thin-walled overlap over the inner circumference of the inner hose 17 results at 19, without a significant reduction in diameter compared to the inner diameter of the inner hose 17 in the area of the end of the shower hose. This results in an overlap or chambering of the hose, so that in particular in combination with the positive connection, a good fixation of the parts 16 and 17 at the shower hose ends is provided, whereby the front side is also welded at 10". The overlap 19 can be dispensed with if necessary. because the extrusion process and the injection molding process can be coupled in such a way that a material bond is created between the radial flange 3" and the inner hose 17. The parts that overlap the hose jacket are narrow and only need to have foil or film thickness, so that no actual thickness is applied, i.e. the hose inner diameter is practically not reduced. In the inner area, however, there is no bond between the jacket surface of the inner plastic hose 17 and the metal hose 16 around it, so that

good flexibility of the hose is guaranteed. Despite the use of different materials, namely metal for the hose 16, primarily made of chrome-plated brass, and PVC for the inner hose 17, the cast or welded connection part 2" results in a perfect and reliable as well as inexpensive connection of the elements, whereby at the same time the further use of sealing disks for the connection to the shower or the fitting can be dispensed with. The welded connection part 2" thus serves on the one hand to hold the two hose elements, namely metal hose 16 and inner hose 17 made of different materials, as a sealing element and at the same time, via the integrally formed noses 11", as an assembly-friendly and
Packaging-like holder for the attached sleeve-shaped union nuts for connection to the shower or the fitting. Here too, the 2" connecting part is conveniently made of polyurethane.

Claims (9)

RiäVSoraJionSdeiäin.ungLittigi ] iensctatsifn j« Protection claims: 1. Sanitary hose with an injection-molded plastic connector which has a radial flange coaxial with the hose, with which the hose is connected to a fitting by means of a union nut, characterized in that the radial flange (3,3',3") is essentially integrally welded to the end face (10,10', 10") of the sanitary hose (1,1',1"). 2. Sanitary hose according to claim 1, with a multi-layer structure which is reinforced by a fabric insert, characterized in that the radial flange (3') is additionally held or interlocked by plastic (9) which has penetrated into the fabric insert (8) on the front side during injection molding of the connecting part (2'). 3. Sanitary hose according to claim 1 or 2, characterized in that the radial flange (3) is additionally held by a thin-walled and integral overlap over the inner (4) and/or outer circumference (4 ¹ ) of the hose (1). 4. Sanitary hose according to claim 3, characterized in that the overlap (4,4') is only partially provided on the inner and/or outer circumference of the hose (1). ungsiftta, 5. Sanitary hose according to claim 4, characterized in that the overlap (4) on the inner circumference of the hose (1) is provided opposite the overlap (4') on the outer circumference. 6. Sanitary hose according to one of claims 1-5, made of an outer metal hose provided with spiral grooves and a plastic hose loosely inserted into this, characterized in that the radial flange (3") is additionally held over the metal hose (16) by a sleeve-like overlap (18) integral therewith, the sleeve-like overlap (18) being in positive engagement (21) with the metal hose (16). 7. Sanitary hose according to claim 6, characterized in that the radial flange (3") is additionally held by a thin-walled overlap (19) integral with it over the inner circumference of the inserted plastic hose (17). 8. Sanitary hose according to one of claims 1-7, characterized in that flexible, radially projecting noses (11,11") are provided on the outer circumference of the radial flange (3,3',3"). 9. Sanitary hose according to claim 8, characterized in that the nose ends (11, 11") lie in an enveloping circle (22) whose diameter corresponds approximately to the inner thread diameter (13) of the sleeve-shaped union nut (12). lO.Sanitary hose according to claim 9, characterized in that the radial flange (3") has a flexible nose (11") diametrically. Sanitary hose according to one of the preceding claims, characterized in that the front end (23) of the hose (1) adjacent to the radial flange (3) is designed to be compressed and the molded-on connecting part (2) engages behind this compression (24) in a form-fitting manner.