EP4329575A1

EP4329575A1 - Flexible hose, in particular vacuum cleaner hose

Info

Publication number: EP4329575A1
Application number: EP22725502.3A
Authority: EP
Inventors: Marco Holst; Dirk SCHWAN
Original assignee: Truplast Kunststofftechnik GmbH
Current assignee: Truplast Kunststofftechnik GmbH
Priority date: 2021-04-27
Filing date: 2022-04-26
Publication date: 2024-03-06
Also published as: CN117177695A; WO2022229219A1; DE102021002202A1

Abstract

A flexible hose (10), in particular a vacuum cleaner hose, has a wavily profiled inner hose (12), which is surrounded by a substantially smooth sheathing (14) and is provided with a hollow connection piece (18) at at least one end (16). The inner hose with the sheathing extends into the connection piece, the sheathing being fastened to the inner hose there by means of a sheath securing means (20). Also attached to the inner hose is a retaining sleeve (24), which forms a first stop face (28) for the connection piece and has a second stop face (30) for a connection-piece securing means (32) which is fastened to the connection piece in order to fix the latter in a tension- and compression-resistant manner with regard to the inner hose via the retaining sleeve. In particular to simplify the assembly and improve the ease of repair, the sheathing terminates substantially flush with the end of the inner hose in the connection piece or protrudes only slightly therefrom. In addition, both the sheathing is attached form-fittingly to the outer circumference of the inner hose by means of the sheath securing means and the retaining sleeve is attached form-fittingly to the inner circumference of the inner hose.

Description

FLEXIBLE HOSE, ESPECIALLY VACUUM CLEANER HOSE

TECHNICAL AREA

The present invention relates to a flexible hose according to the preamble of claim 1. In particular, the invention relates to a flexible vacuum cleaner hose and its packaging, as it is used en masse in an industrial environment, in trade and in private households.

BACKGROUND OF THE INVENTION AND PRIOR ART

Standard vacuum cleaner hoses have a profiled surface, for example, in the form of alternating crests and troughs that are single-threaded or multi-threaded helically lined or ring-shaped on a blow-molded hose. During suction operation, this profiling means that the hose often gets caught as a result of the wave troughs while sliding over furniture, door, workpiece and body edges, which means that the operator has to exert more force during suction operation. As a result of strong entanglements, there can also be jerky interruptions in the operator's smooth movement sequence during suction operation, which leads to an additional impairment of suction comfort.

In addition, the frequent snagging on edges causes increasing damage both to the outer peripheral surface of the hose and to the outer surface of the friction partner, for example an outer surface of furniture. Another negative effect caused by snagging on edges is the resulting noise. The frequent impact of the hard outer peripheral surface of the hose on the floor, for example, also contributes to the generation of noise during suction operation. In order to (also) address these problems, it has already been proposed in the prior art (see, for example, publication EP 1 656 873 A2) to see an inner hose profiled as described above with a substantially smooth casing, which is preferably made of a fabric or braid exists. The state of the art includes, in particular, hoses braided with round monofilaments, flat monofilaments, plied monofilaments and multifilaments, in which case the monofilament or multifilament threads of the braiding can even be flocked with short fibers made from a thermoplastic material (cf. publication EP 2363 210 A2 ). When, in connection with the present invention, a sheathing of the inner hose is mentioned, such braidings of the inner hose are meant in particular.

In these known hoses, the braiding covers the depressions in the corrugated profile of the hose, as a result of which the hose has a smoothed outer peripheral surface. This results in better sliding behavior compared to conventional hoses. There are no longer multiple hose snags, which also reduces the effort required for suction operation.

Due to the supportive effect of the braid, braided hoses also have better mechanical properties than conventional hoses. For example, a braided hose will buckle later than a conventional hose. If the hose is not braided too tightly, it is more flexible than a conventional hose because it can be bent and twisted more easily until it buckles. In addition, in terms of improved appearance, braided hoses offer the possibility of a more flexible outer appearance compared to conventional hoses. In order for the flexibility of the hose to be enhanced by the supporting braid, rather than worsened, it is necessary for the braid to be loosely applied to the hose and not braided as tightly as possible. As a result, the braiding can be compressed while the hose is being bent until the edges of the threads running parallel to one another abut. Only then is a significant counterforce built up, which counteracts the bending movement. If, for example, the braiding is too tight and tightly woven, the braided hose no longer has much better flexibility than the standard hose, and can even be more rigid.

The braiding must therefore not be applied too tautly and tightly to the hose and/or compressed too much on the hose. The properties of the braiding vary depending on whether monofilaments, multifilaments or both threads are braided in a mixture. In the case of a hose that is only loosely braided with monofilaments, i.e. relatively thick individual fibers, there are inevitably gaps in the braiding. A maximum coverage of the hose circumference of approx. 80% can be achieved here. If a hose braided in this way is bent, the threads of the braid sliding on one another and thus also the overlapping gaps shift.

With a braid made of stretchable and compressible multifilaments, i.e. fiber bundles or a hybrid braid made of monofilaments and multifilaments, the circumference of the hose can be braided completely covered, so that a fabric-like surface is created. Due to the stretchable multifilaments, such braids attach to the outer radius of the bent hose when the hose is bent and compress to the inner radius of the bent hose without forming gaps. Excessive compression of the braid on the hose but also leads here to a possibly undesired hose stiffening or bulging.

Since such flexible hoses with a profiled inner hose and a surrounding, essentially smooth casing have two hose components that can basically be moved relative to each other, i.e. can be displaced or rotated, the end assembly of such hoses with connection pieces is more complex than with simple conventional, non-covered hoses. These connectors are used - often in the form of a hollow connecting sleeve - on the one hand to connect one end of the hose to a mobile vacuum cleaner or a stationary central vacuum cleaner, for example, and on the other hand to detachably connect the other end of the hose to a suction nozzle, a suction tube, a handle, a hand-held power tool or the like. In principle, however, the respective connection piece can also be part of the vacuum cleaner or the machine itself or, for example, be formed by the handle, the nozzle, etc.

There is no lack of proposals in the prior art as to how a suitable connection between the hose components and the connecting pieces of such a flexible hose is to be designed. For example, the publication DE 102013 020 687 A1 discloses a suction hose for a vacuum cleaner in which a wound suction channel hose body with ribs on the outer circumference is accommodated in a flexible, essentially smooth hose jacket encasing the suction channel hose body. For connection to the vacuum cleaner or to a hand-held power tool, there are connecting sockets on the suction hose at the longitudinal ends. The connection sockets each comprise a base body on which a connection element is attached for plugging into the hand-held power tool or for plugging into the connection of the vacuum cleaner. A hose receptacle is provided on the respective base body of the connecting sleeve, which has a ribbing on its inside, into which the ribs on the outer circumference of the hose body engage, so that it is held in a rotationally fixed and tension-resistant manner. The base body includes a Rohrab section, in which the hose holder is provided, and a support flange for rotatably supporting the connection element. Hook projections of a hook arrangement are provided on an outer circumference of the pipe section next to the support flange, which serve to hold the hose casing in a torsion-proof and tension-proof manner. The latter is shorter than the hose body and has hook receptacles on its longitudinal ends of the hose jacket, into which the hook projections engage, with a securing ring being arranged over the hook projections in order to fix the connection between the hose jacket and the base body.

The hose jacket is therefore not held on the hose body but on the base body of the connection sleeve.

A disadvantage of this prior art is seen in the fact that such a suction hose can only be repaired with considerable effort - if at all - if only because cutting the hose body and hose jacket to length means that the hook receptacles have to be redesigned in a predetermined size and at a predetermined point would require the hose jacket, which is not easily possible in particular with a braided hose jacket.

From the document WO 2019/011591 A1, which forms the preamble of patent claim 1, a suction hose for a vacuum cleaner, in particular for operation with a hand-held power tool, is also known, with a hose section which has a flexible dust removal hose body and a flexible jacket Has hose body, in which the dust removal hose body is arranged. In this case, between the longitudinal ends of the hose section, a hose extends through a hose jacket of the Dust removal hose body limited suction flow channel for Füh ren a suction flow to the vacuum cleaner.

A connection piece for connection to the hand-held power tool or the vacuum cleaner is arranged on at least one longitudinal end of the hose section, with the jacket hose body and the dust removal hose body extending into an interior space of a hose receptacle of the connection piece, so that the dust removal hose body extends up to the hose holder is covered by the jacket hose body. Special features of this solution are that in the hose holder a mounting section of the dust removal hose body protrudes in front of the jacket hose body, with a holding element in the form of an adhesive tape or the like on an outer lateral surface of the jacket hose body. is attached, which covers a pers to the mounting section of the dust removal hose body free end face of the jacket hose body and which rests on an inner surface of the hose receptacle.

To assemble such a suction hose with the (or the) connection piece(s), either the hose body on the dust removal hose body must be cut to length, which entails the risk of damage to the dust removal hose body, or the hose body is opposite to the dust removal Withdraw the hose body axially and hold it before the holding element is attached, which is already associated with a certain amount of effort, which is undesirable in mass production. When a jacketed hose body is pulled back from a braiding in relation to the dust removal hose body, there is also the risk that the braiding behind the connecting piece will experience excessive compression or bulging, as already described in general above, so that the suction hose at this point is in an undesirable position Way is stiffened or thickened. Furthermore, the publication EP 2614 762 A2 discloses a hose system for a working machine with an attached suction device, which flexibly connects the working machine and the suction device and has a suction hose on which a supply line, in particular a power cable, is arranged on the outside. The power cable can be a conventional power cable that has, for example, three individual conductors, each with a cross section of 2.5 mm ² . The suction hose and the power cable are surrounded by an outer hose which can be a textile hose.

At the ends of this tube system has a two-part cuff, a first part of the cuff having an inner socket which is corrugated or wavy on its outside and onto which one end of the suction hose is attached. The suction hose can be a conventional bellows hose, with a tight fit of the end of the suction hose on the inner socket being achieved by means of a clamping ring placed on the outside. The outer hose also ends in the cuff, specifically in front of the end of the suction hose, and is covered by the second part of the cuff. The power cable coming from the outer tube is led out through an opening on the second part of the cuff. To fix the outer tube, a press fit can be provided on the suction tube and the inner connector. Alternatively, gluing or attachment with another clamping ring can be provided. Finally, in order to cover the connection area and to form a uniform component, the two sleeve parts are pushed together or connected to one another, possibly glued. However, the assembly problems described above for the generic state of the art also exist with this hose system. TASK

Compared to the state of the art described, the invention is based on the task of designing a flexible hose, in particular a vacuum cleaner hose, with an inner hose, a jacket and at least one connecting piece at the end in such a way that the problems mentioned above with regard to the state of the art are addressed and in particular the assembly and, if necessary, the repair of such a hose are simplified.

PRESENTATION OF THE INVENTION

This problem is solved by a flexible hose, in particular a vacuum cleaner hose, having the features of patent claim 1 . Advantageous configurations of the invention are the subject matter of the dependent patent claims.

In the case of a flexible hose, in particular a vacuum cleaner hose, which comprises an inner hose with a corrugated profile, which is surrounded by a substantially smooth casing and is provided at least at one end with a hollow connection piece, into which the inner hose with the casing extends and in which the sheathing is attached to the inner hose by means of a jacket retainer, with a retaining sleeve being attached to the inner hose, which forms a first stop surface for the connecting piece and has a second stop surface for a connecting piece retainer, which is fastened to the connecting piece in order to secure the connecting piece via the retaining sleeve set tensile and pressure-resistant with respect to the inner tube; according to the invention, the casing in the connection piece closes essentially flush with the end of the inner hose or protrudes only slightly axially beyond the end of the inner hose, the casing securing means positively locking the casing on the outer circumference of the inner hose. sets, while the holding sleeve is positively attached to the inner circumference of the inner tube.

Due to the fact that the sheathing in the connection piece ends in the area of the end of the inner hose - and not significantly before the end of the inner hose, e.g. to enable the sheathing to be attached to the inner hose by means of an adhesive tape, as in the generic prior art - the inner hose and Sheathing at the same time, or the sheathing can be easily cut to length on an inner tube of a previously measured length, e.g. by cutting with scissors, a blade or hot. Here, since the cover is not shorter than the inner tube, there is no fear that the inner tube will be damaged in a used area of the finished tube.

In the case of a—here preferred—sheathing in the form of a braiding of monofilament and/or multifilament plastic threads, there is also no need to move the sheathing axially on the inner hose, in particular to pull it back in order to fix the sheathing to the inner hose. There is thus also no risk, as described above with regard to the prior art, of the braiding being compressed, strengthened and/or bulging in an undesired manner during the assembly of the hose.

Both the casing and the holding sleeve for the connecting piece are fixed or fastened in a particularly long-lasting or permanent manner by means of a form fit with the inner hose, the corrugated profile already present on the inner hose being used on the outside and inside circumference. This advantageously allows a minimization of the stock parts/components/aids required for this definition or attachment and the work steps required for this. This low installation effort also reduces the Number of possible sources of error in the assembly of the hose and allows their automation for the mass production of flexible hoses.

Furthermore, the repair of such a flexible hose is also particularly easy if the hose is damaged or leaks, for example in the area of the inner hose or the casing. Disassembly and reassembly of the connecting piece and retaining sleeve are easy to do thanks to the form-fitting connections that are present, in contrast to what would be the case with adhesive connections, for example. The (re) cropping of the casing and the inner hose does not raise any particular difficulties when repairing the flexible hose according to the invention, because no different lengths of casing and inner hose have to be taken into account.

In addition to the high level of repairability in the design of the flexible hose according to the invention, the ease with which it can be used on existing systems is also worth mentioning. In this case, the inner hose, the sheathing, the connecting piece and the connecting piece safety device of the flexible hose do not have to be changed in principle. In this respect, the hose concept according to the invention is also suitable as a retrofit solution.

In a preferred development of the flexible hose, the retaining sleeve is designed in the form of a collar sleeve, with a sleeve section that can be joined to the inner circumference of the inner hose and an adjoining collar section that forms the first and second stop surfaces. Such a part can be produced in a simple manner from a suitable plastic by injection molding. Compared to also conceivable individual webs that protrude at the end of a sleeve portion in radia LER direction, the aforementioned collar portion has the Advantage that no additional measures have to be taken to seal the hose.

In the simplest embodiment, at least one projection extending in the radial direction can be provided on the outer circumference of the sleeve section of the retaining sleeve for positive engagement with the wavy profile of the inner tube. Such a configuration with individual projections is appropriate, for example, when the retaining sleeve is to be latched to a blow-molded hose which has a cross-sectional profile with alternating wave crests and wave troughs, which are formed in a ring shape one behind the other. In such a case, several protrusions in the form of a circumferential sawtooth profile or the like can also extend in the radial direction. be provided.

However, a contour that is complementary to the corrugated profile of the inner tube, in particular that is circumferential, can also be formed on the outer circumference of the sleeve section of the holding sleeve. In the case of a sheathed, flexible hose, for example, in which the wavy profile of the inner hose has alternating crests and troughs, which run in a linear manner as seen in the circumferential direction of the inner hose in a single or multi-threaded manner, the contour on the outer circumference of the inner hose that is complementary to the wavy profile of the inner hose Sleeve section of the holding sleeve act around a Schraubkon structure. Such a holding sleeve is particularly easy to add to the inner circumference of the inner tube.

In principle, it is possible for the jacket fuse to be attached completely independently of the holding sleeve, approximately axially in front of the holding sleeve, on the outer circumference of the casing in order to nevertheless fix the casing in a form-fitting manner within the connecting piece on the inner tube. In contrast, it is preferred if the casing fuse is attached axially in the region of the retaining sleeve. is arranged so that the retaining sleeve forms an abutment for the inner tube when the sheathing is fastened to the inner tube by means of the sheath fuse, because this way the tube cross-section can be reliably prevented from being pressed together.

In an embodiment that is preferred, particularly for flexible hoses with a braiding of the inner hose, which is formed from small monofilament ribbons, the jacket retainer can have a spring steel ring that can be attached to the outer circumference of the jacket and that positively secures the jacket to the wavy profile on the outer circumference of the inner hose. Instead of a spring steel ring, an injection molded part that can be snapped onto the casing, e.g. a slotted plastic ring, can also be used here, or a flexible part, such as a cord, although this is less preferred with regard to the simplest possible design and attachment of the casing fuse is.

With regard to a cost-reducing reduction in the number of construction parts and the simplest possible assembly of the casing fuse, it is also preferred if the casing fuse is designed in one piece with the retaining sleeve.

As a further advantageous alternative to the spring steel ring mentioned above, the casing fuse can comprise at least one retaining element which can be placed on the outer circumference of the casing and which, in the simplest configuration, has at least one projection on its side facing the casing, which secures the casing to the wavy profile on the outer circumference of the inside tube firmly fixed.

In an advantageous further development of this embodiment, the casing fuse can comprise at least two shell-shaped holding elements which are hinged on the collar section of the holding sleeve are hinged. Advantageously, only one part has to be handled during the assembly of the holding sleeve and jacket fuse. In a particularly inexpensive solution that is easy to manufacture by injection molding, the shell-shaped retaining elements can be attached to the collar section of the retaining sleeve via film hinges.

In order to ensure that the shell-shaped holding elements are additionally secured with little effort, the shell-shaped holding elements can also be designed such that they can be latched to the collar section of the holding sleeve by means of a snap-in connection.

A particularly pull-out-resistant jacket fuse is obtained with a preferred embodiment of the flexible hose, in which the or each holding element has a plurality of projections on its side facing the jacket, which are designed like webs or thorns to claw into the jacket when joining or to pierce them towards the inner tube. If the projections are preferably inclined toward the end of the inner tube, this simplifies assembly with a tilting of the respective holding element with respect to the outer circumference of the casing, in which axially spaced projections can successively engage with the casing.

In a particularly preferred embodiment for a dissipative, flexible hose, the connection piece, the holding sleeve and the holding element(s) with its or their projections can consist of an electrically conductive material, with at least one electrically conductive path on the outer circumference of the inner hose can be provided, which runs around the inner hose, and wherein the aforementioned projections make electrical contact with the electrically conductive path. The jacket fuse thus advantageously has an additional, electrically grounding function. As an alternative or in addition to this, in a hose configuration in which the electrically conductive web is in electrical contact with at least one electrically conductive thread, which electrically connects the opposite ends of the inner hose and essentially along a longitudinal axis of the inner hose and transverse to the elec trically conductive path running on the outer circumference of the inner tube is fixed, the projections electrically contact the electrically conductive thread.

Finally, a particularly simple and cost-effective design of the flexible hose is conducive if the connector lock has a retaining ring that can be fastened to the connector and is supported by a spacer against the second stop surface of the retaining sleeve, which is supported by a separate spacer sleeve or the shell-shaped retaining elements of the Jacket fuse is formed. Other features, properties and advantages of the flexible hose according to the invention will become apparent to those skilled in the art from the following description of preferred exemplary embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS

In the following, the invention is explained in more detail using preferred embodiment examples with reference to the accompanying, partially schematic drawings, in which identical or corresponding parts or sections with the same reference signs are chen - possibly supplemented by a prime (') to identify the second embodiment - are provided. In the drawings show:

Fig. 1 is a side view broken off to the left of a flexible hose, namely a vacuum cleaner hose, according to a first embodiment of the invention, with a corrugated profiled inner hose which is surrounded by a sheathing in the form of a braiding - illustrated in detail in FIG. 1 , shown broken away to the left to show details of the inner tube;

FIG. 2 is a sectional view, also broken off to the left, of the hose shown in FIG. 1 broken open in the area of the casing, corresponding to the section line II-II in FIG.

Fig. 3 is a scale compared to Figs. 1 and 2 enlarged te representation of detail III in Fig. 2 to Veran illustrative of details on how the Ummante treatment of the hose according to FIG. 1 by means of a jacket fuse on the inner hose in a hollow connection piece of the hose is attached, which in turn is laid firmly over a retaining sleeve attached to the inner hose in terms of tension and pressure with respect to the inner hose; Fig. 4 is a perspective exploded view of the hose according to Fig. 1 from diagonally above/front left, with - from left to right - a retaining ring of a connecting piece safety device, a spacer sleeve, the jacket safety device in the form of a spring steel ring, the inner hose shown broken off to the left with the the casing shown open on the left, the holding sleeve and the connecting piece;

5 shows a side view broken off to the left of the inner hose of the hose according to FIG. 1, with the casing shown broken open to the left, which is positively fastened to the outer circumference of the inner hose by means of the casing fastener, and the retaining sleeve positively fastened to the inner circumference of the inner hose, in a state before the fitting is attached to the inner tube via the holding sleeve by means of the fitting retainer;

6 shows a perspective view broken off to the left of the hose according to FIG. 1 from diagonally above/front left, with the casing shown broken away, after which, starting from the state according to FIG became;

FIG. 7 shows a perspective view of the retaining ring of the connection piece securing device of the hose according to FIG. 1 obliquely from above/front left;

FIG. 8 shows a side view of the retaining ring according to FIG. 7; Fig. 9 is a sectional view of the retaining ring of Figure 7 accordingly the section line IX-IX in Fig. 8..; 10 shows a side view broken off to the right of a flexible hose, namely a vacuum cleaner hose, according to a second embodiment of the invention, with an inner hose with a corrugated profile, which is surrounded by a sheathing in the form of a braid, which is broken open to the right to illustrate details on the inner hose Darge is provided, the view of an adhesive tape being released, by means of which an electrically conductive thread is attached to the outer circumference of the inner tube;

11 is a sectional view, also broken off to the right, of the hose according to FIG. 10, which has been broken open in the area of the casing, according to the section line XI-XI in FIG. 10;

12 shows a representation of detail XII in FIG. 11, enlarged on the scale compared to FIGS. 10 and 11, to illustrate details of how the sheathing of the hose according to FIG of the hose, which in turn is secured against tension and pressure with respect to the inner hose by a holding sleeve attached to the inner hose, with it being illustrated in particular how the coat fuse also serves to secure at least one electrically conductive track provided on the outer circumference of the inner hose to contact electrically;

13 is a perspective exploded view of the hose according to FIG. Broken inner hose with the casing shown broken open to the right, the holding sleeve on which two cup-shaped holding elements of the coat fuse are articulated, of which the upper holding element is shown in a pivoted-up state in front of its assembled end position, and the connecting piece;

14 is a perspective view of the hose according to FIG. 10, broken off to the right, from diagonally above/rear right, with the casing shown broken open, after starting from the state according to FIG the sheathing was attached to the outer circumference of the inner tube by means of the sheath lock and finally the connecting piece was attached to the inner tube by means of the connecting piece lock via the retaining sleeve; and

15 to 17, side views broken off to the right of the hose according to FIG. 10, which was rotated by 90° about its longitudinal axis compared to the position shown in FIG. 10, each with the casing shown broken open to the right, with the side views being different Illustrate the states of assembly of the sheath lock and the connection piece lock on the inner hose DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

In Figures 1 to 4 and 6, a vacuum cleaner hose is generally numbered with the reference sign 10 as an example of a flexible hose. Only one end of the hose 10 is shown here, which can be one to several meters long, for example, depending on the intended use. The other end of the hose 10 can - but does not have to - be designed accordingly, which is not important for understanding the present invention.

The hose 10 generally has an inner hose 12 with a corrugated profile, which is surrounded by a substantially smooth casing 14 and is provided at least at one end 16 with a hollow connecting piece 18 into which the inner hose 12 with the casing 14 extends. As will be described in more detail after the following, the casing 14 is fixed to the inner tube 12 by means of a jacket fuse 20 in the connecting piece 18, which catch the casing 14 on the outer circumference 22 of the inner tube 12 positively defines.

Furthermore, as will also be explained in detail below, a retaining sleeve 24 is attached to the inner tube 12, more precisely attached to the inner circumference 26 of the inner tube 12 in a form-fitting manner, which forms a first stop surface 28 for the connector 18 and a second stop surface 30 for securing the connector 32 has. The connecting piece fuse 32 is fastened to the connecting piece 18 and is used in conjunction with the retaining sleeve 24 in a manner that will be described in more detail later to secure the connecting piece 18 via the retaining sleeve 24 in a tensile and pressure-resistant manner with respect to the inner tube 12 .

According to another important feature, the casing 14 in the connecting piece 18 ends essentially axially flush with the end 16 of the inner hose 12 or is only slightly axially beyond the end 16 of the inner tube 12 - the latter is not shown in the figures, however.

According to FIGS. 2 and 3 in particular, the inner hose 12 has a wall 34 which, with its inner circumference 26, delimits a cavity 36 for conveying media. On the outer circumference 22, the wall 34 has a wavy profile, i.e. it has a profile 38 which, viewed in section along a longitudinal axis 40 of the hose 10, has a wavy shape with alternating elevations or crests 42 and depressions or troughs 44. In the illustrated embodiment, the crests 42 and troughs 44 run in the circumferential direction of the inner tube 12 as a single thread—or alternatively multiple threads, not shown here—helically. This can be explained by the fact that it is a wound inner tube 12, i.e. an inner tube 12 whose wall 34 is formed from a profile wound helically around the longitudinal axis 40, with adjacent turns of the profile being connected to one another in a media-tight manner.

The profile of the inner hose 12 shown here as an example has two areas when viewed in cross section, namely an area on the left in Fig. 3, the cross section of which essentially has the shape of an upside-down letter U in "angular" notation and forms the wave troughs 44 of the profiling 38, and an area on the right in Fig. 3 which, viewed in cross section, essentially has the shape of a horizontal letter C or a letter C tilted counterclockwise by about 90° and the wave crests 42 on the wound inner hose 12 the profiling 38 forms. As can be seen clearly in FIG. 3, the C-shaped area of a turn of the profile is “hooked” over the left leg of the U-shaped area of an adjacent turn of the profile, so that there is a short profile overlap along it the longitudinal axis 40 results. In the area In this profile overlap, a hot-melt adhesive 46, for example, is provided for the media-tight connection of the adjacent windings of the profile, which forms a helical circumferential seam.

In the embodiment shown, the profile of the inner tube 12 is extruded from a plastic material such as polyethylene (PE), polypropylene (PP) or an ethylene vinyl acetate copolymer (EVAC). As for the hot melt adhesive 46, it can also be made of a plastic material such as PE or EVAC.

As the detail above in Fig. 1 illustrates, in the exemplary embodiment shown, the sheathing 14 of the hose 10 is a braiding 48 of the inner hose 12 made of monofilament and/or multifilament plastic threads, e.g. made of a thermoplastic material such as polyamide (PA). or PE. When the hose 10 is bent, the multifilament threads lie flat against the inner hose 12 on the tension side and compress on the pressure side of the inner hose 12 transversely to the thread and thus also towards the wall 34 of the inner hose 12, so that the braiding 48 is always connected the wall 34 is present. With a particularly advantageous mixing ratio of 50% multifilament threads to 50% monofilament threads, the braided surface of the hose 10 also always remains closed.

Details of the casing fuse 20 in the first exemplary embodiment can be found in particular in FIGS. 3 to 5. Accordingly, the casing fuse 20 has a device on the outer circumference 50 of the Umman 14 attachable spring steel ring 52, which defines the Ummante treatment 14 on the wavy profile 38 on the outer circumference 22 of the inner tube 12 in a form-fitting manner. As shown in Fig. 3, the casing 14 is "pulled" into a corrugation 44 of the profile 38 of the inner hose 12 by the spring steel ring 52 resting on the outer circumference 50 of the casing 14, so that the casing 14 is pulled on both axial sides, i.e. in Fig . 3 is held positively to the left and right on mutually opposite flanks of the profiling 38 of the inner tube 12 . As can be seen in FIG. 4, the spring steel ring 52 is in the form of a helical spring, with a complete winding of slightly more than 360°, for example 400°, around the longitudinal axis 40. The wire diameter of the spring steel ring 52 is selected to be somewhat smaller as the clear distance between the opposing flanks of the profile 38 of the inner tube 12 in the area of the corresponding wave trough 44.

As far as the tensile and pressure-resistant fixing of the connection piece 18 on the inner hose 12 provided with the casing 14 is concerned, it can first be seen in FIGS Inner circumference 26 of the inner tube 12 joinable sleeve section 54 and a subsequent ßenden it in the axial direction collar portion 56, which according to FIGS. 2, 4 and 5, the first and second stop surfaces 28, 30 is formed. For the form-fitting attachment of the holding sleeve 24 to the inner circumference 26 of the inner hose 12, a contour 60 complementary to the wavy profile 38 of the inner hose 12 is formed on the outer circumference 58 of the sleeve section 54 of the holding sleeve 24 in the exemplary embodiment shown. To be more precise, the contour 60 that is complementary to the wavy profile 38 of the inner tube 12 is a screw contour formed on the outer circumference 58 of the holding sleeve 24, as can best be seen in FIG.

The outer diameter of the sleeve section 54 of the retaining sleeve 24 with the screw contour 60 formed thereon is matched to the inner circumference 26 of the inner hose 12 with its profile 38 in such a way that the retaining sleeve 24 can be screwed into the inner hose 12 like a screw so that the retaining sleeve 24 with its sleeve portion 54 over two - or more - threads of the screw contour 60 positively on the Profiling 38 on the inner circumference 26 of the inner tube 12 can be fixed, as can be seen clearly in FIG.

According to FIG. 4 in particular, the collar section 56 of the retaining sleeve 24, which is injection-molded from a suitable plastic, is reinforced in relation to the sleeve section 54 by a plurality of webs 62 distributed evenly over the circumference. The outer diameter of the collar section 56 of the retaining sleeve 24 is matched to the outer diameter of the inner hose 12 provided with the casing 14 in such a way that the collar section 56 protrudes radially beyond the casing 14 of the inner hose 12, as can best be seen in FIG. 3 . With this radial overhang, the collar portion 56 of the retaining sleeve 24 forms the annular second stop surface 30 on the hose side. On the side of the holding sleeve 24 facing away from the hose, however, its collar section 56 has an annular projection 64 which forms the annular first stop surface 28 whose radial dimensions essentially correspond to the radial dimensions of the sleeve section 54 of the holding sleeve 24 .

The hollow connecting piece 18 shown as an example in FIGS. 1, 2, 4 and 6 is also injection molded from a suitable plastic. This connecting piece 18 has a stepped design, with a hose-side sleeve section 66 of smaller diameter and a sleeve section 68 of larger diameter facing away from the hose, which are separated axially by an annular partition 70 . The partition wall 70 has an inside diameter that roughly corresponds to the inside diameter of the collar section 56 of the retaining sleeve 24, so that the connecting piece 18 can strike with its partition wall 70 against the annular projection 64 of the retaining sleeve 24, i.e. against its first stop surface 28, in order to the connection piece 18 over the holding sleeve 24 with respect to the inner tube 12 festzu lay pressure-tight. In order to also fix the connection piece 18 with respect to the inner tube 12 with regard to tensile strength via the retaining sleeve 24 , the connection piece fuse 32 has a retaining ring 72 which is known per se and which can be fastened to the connection piece 18 . For this purpose, a locking connection 74 is provided between the connection piece 18 and the retaining ring 72, formed by spring arms 76 with locking lugs 78 on the retaining ring 72 (see in particular FIGS. 7 to 9) and associated locking windows 80 on the connection piece 18. In the connection piece with the connection piece 18 When the retaining ring 72 is in the locked state, the retaining ring 72, with its annular end face 82 facing the connecting piece 18, forms a counter bearing for a spacer, here in the form of a separate hollow-cylindrical spacer sleeve 84, which in turn is located on the second stop surface 30 on the collar section 56 of the Retaining sleeve 24 can support zen.

It is clear to a person skilled in the art that compressive forces applied to the connecting piece 18 in the direction of the inner tube 12 are introduced via the partition 70 of the connecting piece 18 into the first stop surface 28 on the annular projection 64 of the collar section 56 of the holding sleeve 24 and thus into the holding sleeve 24. The retaining sleeve 24 is supported here with its Schraubkon structure 60 on the outer circumference 58 of the sleeve portion 54 axially on the wavy profiled wall 34 of the inner tube 12 from. If, on the other hand, tensile forces are applied to the connecting piece 18 from the direction of the inner hose 12, these pull via the latching connection 74 on the retaining ring 72, which in turn pulls the spacer sleeve 84 against the second stop surface 30 on the collar section 56 of the retaining sleeve 24 via its end face 82.

The forces are again in the holding sleeve 24 einlei tet, which is again supported with its screw contour 60 on the outer circumference 58 of the sleeve portion 54 axially on the wavy profiled wall 34 of the inner tube 12, this time however, in the opposite direction, ie in the direction away from the inner tube 12.

Finally, particularly in Fig. 3, it can also be seen that in the exemplary embodiment shown here, the casing retainer 20 is arranged axially in the region of the retaining sleeve 24, so that the retaining sleeve 24, when the casing 14 is fastened to the inner hose 12, by means of the casing retainer 20, more precisely the Spring steel ring 52 of the casing fuse 20 also forms a radial abutment for the inner tube 12 . The arrangement is made here in a spatially very compact manner so that according to FIG. When the connection piece 18 is installed, the spacer sleeve 84 of the connection piece fuse 32 covers the spring steel ring 52 of the casing fuse 20, so that the spring steel ring 52 cannot move radially outwards out of its positive fit with the casing 14 and profile 38 on the inner hose 12.

The flexible hose 10 described above can be manufactured as follows, for example: First, the profiled inner hose 12 is cut to a predetermined length and braided with monofilament and/or multifilament plastic threads to form the essentially smooth sheathing 14 . The ends of the casing 14 are then trimmed axially in front of or at the ends 16 of the inner hose 12 such that the casing 14 terminates at the ends 16 of the inner hose 12 at least flush with the ends 16 of the inner hose 12 . This condition is shown for one end of the tube 10 in FIG.

To assemble the (respective) connector 18, the retaining ring 72 and the spacer sleeve 84 of the connector fuse 32 and against the spring force in the radial Direction expanded spring steel ring 52 of the jacket fuse 20 pushed over the end 16 of the ver with the cut to length jacket 14 provided inner tube 12. The holding sleeve 24 is then screwed with its sleeve section 54, more precisely the screw contour 60 formed thereon, into the profiled inner hose 12 until the end 16 of the profiled inner hose 12 is in the immediate vicinity of the collar section 56 of the holding sleeve 24 (cf. Fig. 3 ). The spring steel ring 52 of the casing fuse 20 is then positioned axially in the direction of the collar portion 56 over the sleeve portion 54 of the retaining sleeve 24 and relaxed in such a way that the spring steel ring 52 pulls the casing 14 into the profile 38 of the inner hose 12 . This state is shown in FIG. It is clear that when attaching this jacket lock 20 a relative displacement or twisting between the jacket 14 and the inner hose 12 is not necessary or does not take place, so that the jacketed hose in front of the connecting piece 18 is not changed in any way.

The spacer sleeve 84 and the retaining ring 72 of the connecting piece retainer 32 are then pushed in the direction of the collar section 56 of the retaining sleeve 24 until the end of the spacer sleeve 84 facing the collar section 56 abuts against the second stop surface 30 on the collar section 56 and the retaining ring 72 with its end face 82 comes to rest on the end of the spacer sleeve 84 facing away from the collar section 56 .

The connecting piece 18 can now be pushed with its sleeve section 66 first over the collar section 56 of the retaining sleeve 24 and positioned in the circumferential direction about the longitudinal axis 40 until the reference numeral 74 in Fig the associated locking windows 80 in the connecting piece 18 takes place. A dismantling of the connector 18 and the connector fuse 32 can be done for repair work on the hose 10 in reverse order, including the spring arms 76 must be deflected on the retaining ring 72 in the radial direction to release the locking connection 74. If the holding sleeve 24 is then exposed, as shown in FIG. 5, the holding sleeve 24 can be screwed out of the profiled inner hose 12 with its screw contour 60 . Now the removal of the spring steel ring 52 of the jacket fuse 20 from the jacketed inner hose 12 is also simple. The casing 14 and the inner hose 12 can then be cut to length again as desired before the hose 10 is reassembled as described above by attaching the retaining sleeve 24 to the inner circumference 26 of the inner hose 12, the casing retainer 20 to the outer circumference 50 of the casing 14 and the connecting piece 18 is completed by means of the connection piece fuse 32 on the holding sleeve 24 .

10 to 17, the second exemplary embodiment of the flexible hose 10' will only be described insofar as it differs significantly from the above-described first exemplary embodiment of the hose 10. In this case, the same reference symbols, supplemented by a prime (′), denote components or groups of the second exemplary embodiment which are the same as or correspond to those of the first exemplary embodiment.

First of all, the inner tube 12' of the flexible tube 10' according to the second exemplary embodiment is designed differently than in the first exemplary embodiment. Namely, as best seen in FIGS. 12-14, on the outside of wall 34' there is at least one electrically conductive trace 86' which extends around wall 34' and serves to collect electrostatic charges and forward. The electrically conductive trace 86' is in electrical contact with at least one electrically conductive thread 88', which electrically connects opposite ends 16' of the inner tube 12' in order to divert the electrostatic charges there. The electrically conductive thread 88' runs essentially along it as shown in FIGS longitudinal axis 40' of tube 10' and transverse to or crossing electrically conductive path 86'. The electrically conductive filament 88' is attached to the outer periphery 22' of the wall 34', as can be seen particularly in Figures 12-14. More precisely, the at least one electrically conductive thread 88' is attached to the outside of the wall 34' in this exemplary embodiment by means of an adhesive tape 90', which covers the electrically conductive thread 88' on both sides, viewed in the circumferential direction of the inner tube 12'.

Such a dissipative hose 10 'or inner hose 12' is the subject of the earlier German patent application DE 102020 006 493.0 of the same applicant, to which at this point clearly the further, more precise structure, the function of the hose and its production to avoid repetitions expressly be referred.

As shown in particular in FIGS. 10, 13 and 14, the sheathing 14', which is fundamentally unchanged compared to the first exemplary embodiment, covers the electrically conductive web 86', the electrically conductive thread 88' and the adhesive tape 90' on the inner tube 12'. With regard to the sheathing, it should also be noted at this point that the sheath securing device described in more detail below for the second exemplary embodiment is, in the case of a braiding, more suitable for sheathings that consist at least of a mix of monofilament and multifilament plastic threads. In the case of braids made from purely monofilament plastic threads, the jacket fuse described for the first exemplary embodiment is preferred. While the connecting piece 18' and the retaining ring 72' of the connecting piece fuse 32' are of identical design to the first exemplary embodiment, there are differences in the jacket fuse 20', the retaining sleeve 24' and the further structure of the connecting piece fuse 32'. In particular, the man telsicherung 20 'in one piece with the retaining sleeve 24' is formed here, as will be described below.

Generally speaking, the casing fuse 20' in the second exemplary embodiment comprises at least one holding element 92' that can be placed on the outer circumference 50' of the casing 14' and that has at least one projection 94' on its side facing the casing 14' of the wave-shaped profiling 38' on the outer circumference 22' of the inner tube 12' in a form-fitting manner. More precisely, the jacket fuse 20 'in this case includes two - or more - holding elements 92', which are shell-shaped and can be applied to the outer circumference 22 'of the inner tube 12' to bring about the addressed form fit.

In the illustrated embodiment, these retaining members 92' are hinged to the collar portion 56' of the retaining sleeve 24', as best seen in FIG. In a configuration that is technically simple in terms of injection molding, the shell-shaped retaining elements 92' are connected here via film hinges 96' to the collar section 56' of the retaining sleeve 24', specifically on the side of the sleeve section 54' of the retaining sleeve 24'. It can also be seen in particular from FIGS. 15 and 16 that the shell-shaped holding elements 92' can be latched to the collar section 56' of the holding sleeve 24' by means of a latching connection 98'. For this purpose, a latching lug 100' is provided on each holding element 92', which can be latched with an associated latching recess 102' in the collar section 56' of the holding sleeve 24'. 2 and 3 of the first embodiment with, in particular, FIGS. 11, 13 and 16 for the second embodiment example - are also functional components of the connection piece securing device 32', which serve to absorb a tensile force applied to the connection piece 18' and directed away from the hose 10', which is applied via the retaining ring 72' latched to the connection piece 18' to the retaining elements 92' trained second stop surface 30 'act to transfer to the holding sleeve 24', so that they can be supported by means of the screw contour 60 'of the holding sleeve 24' on the profile 38 'of the inner tube 12'.

As can also be seen in FIGS. 12 and 13, each of the holding elements 92' on its side facing the casing 14' has a plurality of projections 94' which are designed in the manner of webs or thorns to engage in the casing when joined 14' or to pierce this toward the inner tube 12', as shown in FIG. The projections 94' are advantageously inclined toward the end 16' of the inner hose 12', as can be seen in FIG. because when the retaining members 92' are folded closed, the protrusions 94' impact the shroud 14' substantially normally so that they do not bend over, and then bias the shroud 14' toward the collar portion 56' of the retaining sleeve 24'.

In the exemplary embodiment shown, it is also provided that the connection piece 18' and the holding sleeve 24' with the holding elements 92' together with the projections 94' are made of an electrically conductive material, as is described in the earlier patent application above. In this case, a electrical contacting of the electrically conductive track 86' provided on the outer circumference 22' of the inner tube 12' by the projections 94', as shown in FIG. Alternatively or in addition to this, the projections 94' can also make electrical contact with the electrically conductive thread(s) 88' as a result of the piercing of the casing 14'.

The above-described flexible hose 10' according to the second exemplary embodiment can, for example, be made up as follows: First, the profiled inner hose 12' is cut to a predetermined length and braided with monofilament and/or multifilament plastic threads to form the essentially smooth sheathing 14' . The ends of the casing 14' are then cut in such a way that the casing 14' is at least flush with the ends 16' of the inner hose 12. The electrically conductive thread 88′ with the adhesive tape 90′ can remain projecting beyond the casing 14′, so that it can be folded back onto the outer circumference 50′ of the casing 14′, as shown in FIG. 13 .

To assemble the connector 18', the retaining ring 72' of the connector retainer 32' is first pushed over the end of the flexible hose 10'. The holding sleeve 24' is then screwed with its sleeve section 54' into the profiled inner hose 12' by means of the screw contour 60' formed thereon, until the end 16' of the profiled inner hose 12' is closely opposite or on the collar section 56' of the holding sleeve 24' this abuts, as shown in Fig. 15.

The shell-shaped holding elements 92' connected via the film hinges 96' are then folded together until the outer edges of the shell-shaped holding elements 92', which extend in the direction of the longitudinal axis 40' in the closed state, rest against one another. Here, the thorn-like projections 94' pierce the casing 14', possibly under electrical force Contacting of the electrically conductive web 86' and/or the electrically conductive thread(s) 88'. At the end of this pivoting movement, the latching lugs 100' latch on the retaining elements 92' with the associated latching recesses 102' on the collar section 56' of the holding sleeve 24'. This state is shown in FIG.

The joining of the retaining ring 72 'of the connection piece fuse 32' to the connection piece 18 'can now be done as described for the first game Ausführungsbei to the connection piece 18' on the retaining sleeve 24 'also tensile strength on the inner tube 12' set.

Finally, the state as shown in FIG. 17 results. The connecting piece 18' and the retaining sleeve 24' can be dismantled, for example for repair purposes on the hose 10', in the reverse order.

A flexible hose, in particular a vacuum cleaner hose, has an inner hose with a corrugated profile, which is surrounded by a substantially smooth casing and is provided with a hollow connection piece at at least one end. The inner hose with the sheath extends into the connection piece, which is attached to the inner hose there by means of a sheath retainer. A retaining sleeve is also attached to the inner hose, which forms a first stop surface for the connection piece and has a second stop surface for a connection piece safety device, which is fastened to the connection piece in order to secure it over the retaining sleeve in a tensile and pressure-resistant manner with regard to the inner hose. In particular, to simplify assembly and improve the ease of repair, the sheathing in the connection piece ends essentially flush with the end of the inner tube or protrudes only slightly beyond it. In addition, both the sheathing are attached to the outer circumference of the inner hose by means of the sheath securing device and the retaining sleeve is attached to the inner circumference of the inner hose in a form-fitting manner. LIST OF REFERENCE NUMBERS , 10' hose , 12' inner hose , 14' jacket , 16' end , 18' fitting , 20' jacket fuse , 22' outer circumference , 24' retaining sleeve , 26' inner circumference , 28' first abutment surface , 30' second abutment surface , 32' Connection piece securing, 34' wall, 36' cavity, 38' profiling, 40' longitudinal axis, 42' wave crest, 44' wave trough, 46' hot-melt adhesive

Braid , 50' outer circumference

Spring steel ring, 54' sleeve section, 56' collar section, 58' outer circumference, 60' complementary contour, screw contour, 62' bar, 64' annular projection, 66' sleeve section, 68' sleeve section, 70' annular partition, 72' retaining ring, 74' latching connection , 76' spring arms , 78' detent , 80' detent window , 82' face

spacer sleeve electrically conductive web electrically conductive thread ’ adhesive tape ’ retaining element ’ protrusion ’ film hinge ’ snap-in connection

detent

notch

Claims

PATENT CLAIMS :

1. Flexible hose (10, 10'), in particular a vacuum cleaner hose, with an inner hose (12, 12') with a wavy profile, which is surrounded by a substantially smooth casing

(14, 14') and is provided on at least one end (16, 16') with a hollow connection piece (18, 18') into which the inner hose (12, 12') with the casing (14, 14') ) and in which the casing (14, 14') is fastened to the inner hose (12, 12') by means of a casing retainer (20, 20'), a holding sleeve (24, 24') being attached to the inner hose (12, 12') is attached, which forms a first stop surface (28, 28') for the connection piece (18, 18') and a second stop surface (30, 30') for a connection piece safety device (32, 32') which is attached to the connection piece (18, 18') in order to fix the connecting piece (18, 18') via the retaining sleeve (24, 24') in a manner that is resistant to tension and pressure with respect to the inner tube (12, 12'), characterized in that the casing ( 14, 14') in the fitting (18, 18') substantially flush with the end

(16, 16 ') of the inner tube (12, 12') terminates or single Lich slightly axially beyond the end (16, 16 ') of the inner tube (12, 12') protrudes, the jacket fuse (20, 20 ') the Casing (14, 14') on the outer circumference (22, 22') of the inner hose (12, 12') in a form-fitting manner, while the retaining sleeve (24, 24') on the inner circumference (26, 26') of the inner hose (12, 12 ') is fixed in a form-fitting manner.

2. Flexible hose (10, 10') according to claim 1, characterized in that the holding sleeve (24, 24') is designed in the form of a collar sleeve, with an inner circumference (26, 26') of the inner hose (12, 12') joinable sleeve section (54, 54') and an adjoining collar section (56, 56'), which forms the first and second stop surfaces (28, 28'; 30, 30').

3. Flexible hose (10, 10') according to claim 2, characterized in that on the outer circumference (58, 58') of the sleeve section (54, 54') of the holding sleeve (24, 24') there is at least one extending in the radial direction Projection for form-fitting engagement with the wavy profile (38, 38') of the inner tube (12, 12') or a contour (60, 60 ') is trained.

4. Flexible hose (10, 10') according to claim 3, characterized in that the wavy profile (38, 38') of the inner hose (12, 12') has alternating crests (42, 42') and troughs (44, 44 ') which, viewed in the circumferential direction of the inner hose (12, 12'), run in a single or multiple-thread helical manner, with the contour (60, 60') on the outer circumference (58, 58') of the sleeve section (54, 54') of the holding sleeve (24, 24') is a screw contour.

5. Flexible hose (10, 10 ') according to any one of the preceding claims, characterized in that the jacket fuse

(20, 20 ') is arranged axially in the region of the holding sleeve (24, 24'), so that the holding sleeve (24, 24 ') when fastening the casing (14, 14') on the inner tube (12, 12 ') by means the

Jacket fuse (20, 20 ') forms an abutment for the inner tube (12, 12').

6. Flexible hose (10) according to one of the preceding claims, characterized in that the jacket fuse (20) has a spring steel ring (52) which can be attached to the outer circumference (50) of the jacket (14) and which holds the jacket (14) to the corrugated Profiling (38) on the outer circumference (22) of the inner tube (12) positively defines.

7. Flexible hose (10') according to any one of claims 1 to 5, characterized in that the jacket fuse (20') is formed in one piece with the retaining sleeve (24').

8. Flexible hose (10') according to one of Claims 1 to 5 and 7, characterized in that the casing fuse (20') comprises at least one holding element (92') which can be placed on the outer circumference (50') of the casing (14'). , which has at least one projection (94') on its side facing the casing (14'), which filtrate the casing (14') on the wavy profile (38') on the outer circumference (22') of the inner tube (12'). positively defined.

9. Flexible hose (10′) according to claim 8, characterized in that the jacket fuse (20′) comprises at least two shell-shaped holding elements (92′) which are hinged to the collar section (56′) of the holding sleeve (24′). .

10. Flexible hose (10′) according to claim 9, characterized in that the shell-shaped holding elements (92′) are connected to the collar section (56′) of the holding sleeve (24′) via film hinges (96′).

11. Flexible hose (10') according to claim 9 or 10, characterized in that the shell-shaped holding elements (92') can be latched to the collar section (56') of the holding sleeve (24') by means of a latching connection (98').

12. Flexible hose (10 ') according to any one of claims 8 to 11, characterized in that the or each holding element (92') on its side facing the casing (14 ') a

Having a plurality of projections (94') which are designed like webs or thorns to claw into the casing (14') during joining or to pierce it towards the inner hose (12').

13. Flexible hose (10') according to claim 12, characterized in that the projections (94') are inclined towards the end (16') of the inner hose (12').

14. Flexible hose (10') according to claim 12 or 13, characterized in that the connecting piece (18'), the holding sleeve (24') and the holding element(s) (92') with its or their projections (94 ') consist of an electrically conductive material and at least one electrically conductive track (86') is provided on the outer circumference (22') of the inner tube (12'), which runs around the inner tube (12'), the projections ( 94') make electrical contact with the electrically conductive track (86').

15. Flexible hose (10') according to claim 14, characterized in that the electrically conductive path (86') is in electrical contact with at least one electrically conductive thread (88') which connects the ends (16') facing away from one another. ) of the inner tube (12') and is attached to the outer circumference (22') of the inner tube (12') essentially along a longitudinal axis (40') of the inner tube (12') and transversely to the electrically conductive path (86'). , wherein the projections (94') electrically contact the electrically conductive thread (88').

16. Flexible hose (10, 10') according to any one of the preceding

Claims, characterized in that the connecting piece safeguard (32, 32') has a retaining ring (72, 72') which can be fastened to the connecting piece (18, 18') and which is opposite the second stop surface (30, 30') of the holding sleeve ( 24, 24') via a spacer, which is formed by a separate spacer sleeve (84) or the shell-shaped holding elements (92') of the jacket fuse (20').

17. Flexible hose (10, 10') according to any one of the preceding

Claims, characterized in that the sheathing (14, 14') is a braiding of monofilament and/or multifilament plastic threads.