Flexible Hose, more Particularly Vacuum Cleaner Hose, Method for Production of Same and Device Which can be Used Herefor

Abstract

A flexible hose (10), for a vacuum cleaner, has a wall (12), an inner side (14) of which delimiting a cavity (16) for conveying media and at least one outer side (18) of which having a profiling (20) which has, in section, seen along a longitudinal axis (22) of the hose, elevations (24) and depressions (26). On the outer side of the wall, at least one electrically conductive track (28) is provided which extends around the wall and is in electrical contact with at least one electrically conductive thread (30) which electrically connects ends of the hose facing away from one another. The electrically conductive thread is fastened to the outer side in a manner extending substantially along the longitudinal axis of the hose and transverse to the electrically conductive track.

Claims

1. A flexible hose (10), with a wall (12) which by an inner side (14) delimits a cavity (16) for the conveying of media and has at least at an outer side (18) a profiling (20) which as seen in section along a longitudinal axis (22) of the hose (10) has a wave shape with elevations (24) and depressions (26), wherein provided at the outer side (18) of the wall (12) is at least one electrically conductive track (28) which extends around the wall (12) and is in electrical contact with at least one electrically conductive thread (30) electrically connecting mutually remote ends (32, 34) of the hose (10), characterized in that the electrically conductive thread (30) extending substantially along the longitudinal axis (22) of the hose (10) and transversely to the electrically conductive track (28) is secured to the outer side (18) of the wall (12).

2. A flexible hose (10) according to claim 1, characterized in that the electrically conductive thread (30) is secured to the outer side (18) of the wall (12) by an adhesive strip (40).

3. A flexible hose (10) according to claim 2, characterized in that the adhesive strip (40) covers the electrically conductive thread (30) to both sides as seen in circumferential direction of the hose (10).

4. A flexible hose (10) according to claim 1, characterized in that the electrically conductive thread or the adhesive strip (40) covering the electrically conductive thread (30) is surrounded at the outer side (18) of the wall (12) by a braiding (42) of the hose (10).

5. A flexible hose (10) according to claim 1, characterized in that the electrically conductive track (28) on the outer side (18) of the wall (12) is formed near to or at the elevations (24) of the profiling (20).

6. A flexible hose (10) according to claim 1, characterized in that the hose (10) is provided at one or both of the mutually remote ends (32, 34) with a hose mounting member (44, 46) of an electrically conductive material.

7. A flexible hose (10) according to claim 6, characterized in that the profiling (20) of the hose (10) at the outer side is helical and the end (32) of the hose (10) is screwed by the helical profiling (20) into an associated internally threaded section (48) of the hose mounting member (44), wherein the electrically conductive thread (30) is clamped between the profiling (20) and the internally threaded section (48) with formation of an electrical contact.

8. A flexible hose (10) according to claim 6, characterized in that the end (34) of the hose (10) is plugged into an associated receiving section (50) of the hose mounting member (46) and glued to the hose mounting member (46) by an electrically conductive adhesive (52), into which the electrically conductive thread (30) extends with formation of an electrical contact.

9. A flexible hose (10) according to claim 1, characterized in that the wall (12) of the hose (10) is formed from a helically wound profile (36), wherein adjacent windings of the profile (36) are media-tightly connected together.

10. A flexible hose (10) according to claim 9, characterized in that the adjacent windings of the profile (36) are media-tightly connected together by a hot-melt adhesive (38).

11. A method of producing a flexible hose (10), particularly according to claim 1, characterized by the following method steps: a) forming a basic hose having a wall (12) which by an inner side (14) delimits a cavity (16) about a longitudinal axis (22) and has at least at an outer side (18) a profiling (20) which as seen in section has a wave shape with elevations (24) and depressions (26), wherein the wall (12) is formed from an electrically conductive material or at least one electrically conductive track (28) is formed at the outer side (18) of the wall (12) so that the electrically conductive track (28) extends around the wall (12), b) applying at least one electrically conductive thread (30) to the outer side (18) of the wall (12) so that the electrically conductive thread (30) extends substantially along the longitudinal axis (22) and transversely to the electrically conductive track (28) and c) securing the electrically conductive thread (30) to the outer side (18) of the wall (12) so that the electrically conductive thread (30) electrically contacts the electrically conductive track (28).

12. A method of producing a flexible hose (10) according to claim 11, characterized in that in step a) of forming the basic hose initially a profile (36) is extruded from an electrically conductive plastics material or co-extruded from two plastics materials of different electrical conductivity so that the profile (36) comprises at least one electrically conductive track (28), whereupon the profile (36) is helically wound to form the wall (12) of the basic hose, wherein adjacent windings of the profile (36) are media-tightly connected together.

13. A method of producing a flexible hose (10) according to claim 12, characterized in that the adjacent windings of the profile (36) are media-tightly connected together by a hot-melt adhesive (38).

14. A method of producing a flexible hose (10) according to claim 11, characterized in that the steps b) of applying and c) of securing the electrically conductive thread (30) to the outer side (18) of the wall (12) are performed at the same time.

15. A method of producing a flexible hose (10) according to claim 11, characterized in that after the step c) of securing the electrically conductive thread (30) to the outer side (18) of the wall (12) a hose mounting member (44, 46) of an electrically conductive material, which electrically contacts the electrically conductive thread (30), is attached to one or both of the mutually remote ends (32, 34) of the hose (10) cut to length.

16. A device (54) for applying an electrically conductive thread (30) to an outer side (18) of a flexible hose (10) according to claim 1, wherein the outer side (18) of the hose (10) has a profiling (20) which as seen in section along a longitudinal axis (22) of the hose (10) has a wave shape with elevations (24) and depressions (26), characterized by an applicator (68) for the electrically conductive thread (30), the applicator having a rotatable applicator wheel (70) which is similar to a stock wheel or cell wheel and at the outer circumference of which the electrically conductive thread (30) can be fed, the applicator wheel being adapted to enter into interlocking engagement with the profiling (20) of the hose (10) placeable in a hose support (64) so that when the applicator wheel (70) is rotating a relative advance movement between hose (10) and applicator (68) takes place, in which the applicator wheel (70) applies the electrically conductive thread (30) to the profiling (20) of the hose (10) along the longitudinal axis (22) of the hose (10) to follow the elevations (24) and depressions (26).

17. A device (54) according to claim 16, characterized in that the applicator (68) comprises an applicator arm (82) on which the applicator wheel (70) is rotatably mounted and which is pivotable with respect to the hose support (64) about a selectively fixable pivot axis (84).

18. A device (54) according to claim 17, characterized in that the applicator arm (82) together with the applicator wheel (70) and the pivot axis (84) thereof is so arranged with respect to the hose support (64) that a torque about the pivot axis (84) arises in the direction of the hose support (64) and/or that the applicator arm (82) is resiliently biased about its pivot axis (84) in the direction of the hose support (64).

19. A device (54) according to claim 16, characterized by a frame (56) on which the hose support (64) is mounted in stationary position, wherein the applicator (68) comprises an applicator carriage (72) which carries the applicator wheel (70) and is guided at the frame (56) to be displaceable along the hose support (64).

20. Device (54) according to claim 16, characterized in that the applicator (68) comprises a feed device (94) for the electrically conductive thread (30) and a feed device (96) for an adhesive strip (40), wherein the electrically conductive thread (30) and the adhesive strip (40) can be fed from the feed devices (94, 96) to a pair of guide rollers (100, 102) which are adapted to combine the thread (30) and adhesive strip (40) before being passed on to the applicator wheel (70).

21. A device (54) according to claim 16, characterized in that the applicator wheel (70) has between two hub sections (134, 136) a plurality of axle pins (138) which are distributed uniformly over the circumference and which each rotatably mount a respective hollow-cylindrical sleeve (140) as pressing body for the electrically conductive thread (30).

22. A device (54) according to claim 16, characterized in that the applicator wheel (70) is drivably connected with a rotary drive (132).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The invention is explained in more detail in the following by way of preferred embodiments with reference to the accompanying, partly schematic, drawings, in which the same or corresponding parts or sections are provided with the same reference numerals, wherein in the drawings:

[0049] FIG. 1 shows a twice-interrupted side view of a flexible hose, namely a vacuum cleaner hose, according to a first embodiment of the invention, which is provided at both sides with a hose mounting member;

[0050] FIG. 2 shows a twice-interrupted longitudinal sectional view of the flexible hose according to FIG. 1;

[0051] FIG. 3 shows an illustration, which is enlarged in scale, of the detail III in FIG. 2 in a middle region of the flexible hose according to FIG. 1;

[0052] FIG. 4 shows an illustration, which is enlarged in scale, of the detail IV in FIG. 2 at the hose mounting member, which is on the left in FIGS. 1 and 2, of the flexible hose according to FIG. 1;

[0053] FIG. 5 shows an illustration, which is enlarged in scale, of the detail V in FIG. 2 at the hose mounting member, which is on the right in FIGS. 1 and 2, of the flexible hose according to FIG. 1;

[0054] FIG. 6 shows a broken-away plan view, which is enlarged in scale, of the flexible hose according to FIG. 1, with a viewing direction corresponding with the arrow VI in FIG. 1, wherein an electrically conductive thread, which is secured to an outer side of the hose by an adhesive strip, for conducting away electrostatic charges is illustrated by dashed line;

[0055] FIG. 7 shows a once-interrupted perspective view of a device according to the invention for application of the electrically conductive thread to the flexible hose according to FIG. 1 from obliquely above and laterally left, with a view of an applicator for the electrically conductive thread in a start position with respect to the hose;

[0056] FIG. 8 shows a once-interrupted perspective view, which corresponds with FIG. 7, of the device according to FIG. 7 obliquely from above and the left side, in which the applicator is disposed in a middle position over the flexible hose;

[0057] FIG. 9 shows a once-interrupted perspective view, which is again analogous to FIG. 7, of the device according to FIG. 7 obliquely from above and the left side, in which the applicator is disposed in an end position with respect to the flexible hose;

[0058] FIG. 10 shows an illustration, which is enlarged in scale, of the detail X in FIG. 8 for illustration of further details of the applicator of the device according to FIG. 7;

[0059] FIG. 11 shows a side view, which is broken away on both sides, of the device according to FIG. 7 with a view of the applicator disposed in the middle position in correspondence with FIG. 8;

[0060] FIG. 12 shows a front view of the device according to FIG. 7, with a viewing direction from the right in FIG. 11;

[0061] FIG. 13 shows a sectional view of the device according to FIG. 7 in correspondence with the offset section line XIII-XIII in FIG. 11;

[0062] FIG. 14 shows a side view, which is broken away on both sides, of the device according to FIG. 7 in correspondence with the section line XIV-XIV in FIG. 12;

[0063] FIG. 15 shows a side view, which is broken away on both sides, of a flexible hose, namely a vacuum cleaner hose, according to a second embodiment of the invention, in which the hose is provided on its outer side with a braiding;

[0064] FIG. 16 shows a longitudinal sectional view, which is broken away on both sides, of the flexible hose according to FIG. 15; and

[0065] FIG. 17 shows an illustration, which is enlarged in scale, of the detail XVII in FIG. 16 in a middle region of the flexible hose according to FIG. 15.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0066] A vacuum cleaner hose, as an example of a flexible hose, is denoted generally by the reference numeral 10 in the figures. According to, in particular, FIGS. 2 to 5 or 16 and 17 the hose 10 has a wall 12 which by an inner side 14 bounds a cavity 16 for the conveying of media. At an outer side, the wall 12 has a profiling 20 which as seen in section along a longitudinal axis 22 of the hose 10 has a wave shape with elevations 24 and depressions 26. As can be best seen in FIGS. 3 to 6 and 17, provided at the outer side 18 of the wall 12 is at least one electrically conductive track 28 which extends around the wall 12 and serves the purpose of collecting and passing on electrostatic charges. As explained in more detail in the following, the electrically conductive track 28 is in electrical contact with at least one electrically conductive thread 30, which electrically connects mutually remote ends 32, 34 of the hose 10 so as to conduct away the electrostatic charges thereat.

[0067] In that regard, according to, for example, FIG. 6 the electrically conductive thread 30 extends substantially along the longitudinal axis 22 of the hose 10 and transversely to the electrically conductive track 28 or crossing the latter, wherein the electrically conductive thread 30 is secured to the outer side 18 of the wall 12 as can be seen in, in particular, FIGS. 3 to 5 and 17. In this embodiment, the electrically conductive thread 30 follows the elevations 24 and depressions 26 of the profiling 20, wherein the thread 30 directly bears against the elevations 24 and—for producing an electrical contact—obviously against the electrically conductive track 28, whereas the thread 30 in the region of the depressions 26 has a certain spacing from the wall 12. By comparison with an equally possible “stretched out” course of the electrically conductive thread 30 it is thus possible, for example, to achieve a greater degree of flexibility of the hose 10.

[0068] In the illustrated embodiments the hose is a wound flexible hose 10, i.e. a hose 10 of which the wall 12 is formed from a profile 26 helically wound around the longitudinal axis 22, wherein adjacent windings of the profile 36 are connected together to be sealed relative to media. The profile 36 shown here by way of example has as seen in cross-section two regions, namely a region on the right in each of FIGS. 3 to 5 and 17, the cross-section of which has substantially the form of the letter U in “angular” style of writing and which at the wound hose 10 forms the depressions 26 of the profiling 20, and a region on the left in each of FIGS. 3 to 5 and 17, which as considered in cross-section has substantially the form of a letter C in horizontal position or tipped in clockwise sense through 90° and forms at the wound hose 10 the elevations 24 of the profile 20. As can be readily seen in FIGS. 3 to 5 and 17, the C-shaped region of a winding of the profile 36 is quasi “hooked” over the righthand limb of the U-shaped region of an adjacent winding of the profile 36 so that in each instance a short profile overlap along the longitudinal axis 22 arises thereat. In order to provide media-tight connection of the adjacent windings of the profile 36 there is provided in the region of this profile overlap, for example, a hot-melt adhesive 38 which forms the helically encircling seam shown in FIGS. 3 to 5 and 17.

[0069] It is also evident from FIGS. 3 to 5 and 17 that the electrically conductive track 28 of the hose 10 is formed on the outer side 18 of the wall 12 near to or at the elevations 24 of the profiling 20 and, in particular, as a sub-region of the profile 36, which in the wound state of the profile 36 similarly extends helically around the longitudinal axis 22.

[0070] In the illustrated embodiments the profile 36 is co-extruded from two plastics materials of different electrical conductivity so that the profile 36 includes the electrically conductive track 28. In that regard, a principal part of the profile 36 can consist of a non-conductive plastics material such as, for example, polyethylene (PE), polypropylene (PP) or an ethylene vinyl acetate copolymer (EVAC), whereas the electrically conductive track 28 is formed from a conductive plastics material. The latter can be, for example, a PE, PP or EVAC basic material which is rendered conductive by addition of conductive components such as, for example, carbon particles.

[0071] However, in the alternative it is also possible in correspondence with the respective electrical dissipation requirements to co-extrude the profile 36 entirely from such electrically conductive plastics materials and, in a given case, to even extrude with material uniformity. In such a case the profile overall forms the electrically conductive track by its outer surface.

[0072] As far as the hot-melt adhesive 38 is concerned this can similarly consist of a plastics material such as, for example, PE or EVAC, which is either non-conductive or is made conductive.

[0073] By the term “electrically conductive thread” 30 generally used here there is to be understood on the one hand a metalized thread, cord or yarn, for example an elastic yarn of a plastics material such as polyamide (PA), which is provided with, for example, a silver coating or a coating of copper, gold or platinum promising very good conductivity, or, however, a track or a (adhesive) strip of a plastics material or synthetic resin made electrically conductive in suitable manner, but also on the other hand pure metallic conductors such as wires or strands of copper or the like, wherein the actual realization of the electrically conductive thread 30 depends on which demands are placed on the hose 10 with respect to, in particular, the electrical and mechanical properties thereof. Thus, for example, in the case of a flexible hose 10 which is subject in use to greater degrees of alternating bending loads or tension loads it has to be ensured that the electrically conductive thread 30 does not break or tear or do so prematurely, which tends to exclude metallic conductors, which may be liable to work-harden, from such a case of use. With respect to electrical conductivity, a specification with respect thereto can be, for example, that the entire hose has to have only a predetermined resistive impedance able to be achieved, for example, by suitable selection of the electrically conductive thread 30.

[0074] As already mentioned further above, at least one electrically conductive thread 30 is provided, i.e. in correspondence with the respective requirements it is also possible to provide several electrically conductive threads in order to, for example, reduce the electrical resistance in an overall arrangement and/or provide a—optionally multiple—redundant overall arrangement. In that regard, the electrically conductive threads 30 can run adjacent to one another or at least partly cross or intersect under electrical contact with one another. In such a case the electrical connection of the mutually remote ends 32, 34 of the hose 10 and the electrical contacting of the electrically conducting track 28 is achieved by the overall arrangement of electrically conductive threads 30. In other words, it is in principle possible that none of the electrically conductive threads 30 of such an overall arrangement by itself bridges the entire path between the mutually remote ends 32, 34 of the hose 10, but the overall arrangement and/or only a part or one of the electrically conductive threads 30 of such an overall arrangement contacts the electrically conductive track 28.

[0075] As, moreover, FIGS. 3 to 6 and 17, in particular, show, the at least one electrically conductive thread 30 in the illustrated embodiments is secured to the outer side 18 of the wall 12 by an adhesive strip 40. According to FIG. 6 the adhesive strip 40 can in that case cover the electrically conductive thread 30 to both sides as seen in circumferential direction of the hose 10. The adhesive strip 40 is then designed so that its adhesive side reliably adheres to the plastics material of the wall 12 or of the profile 36. Possible backings for the adhesive strip 40 are foils, non-woven fabrics or textiles of a synthetic material such as, for example, PE, PP, polyvinylchloride (PVC), polyethylene terephthalate (PET), polyimide (PI) or polyurethane (PUR), according to the respective field of use of the hose 10.

[0076] In the embodiment according to FIGS. 15 to 17 there is an additional feature that the adhesive strip 40 covering the electrically conductive thread 30 is surrounded at the outer side 18 of the wall 12 of the hose 10 by a braiding 42. The braiding 42 can consist of monofilamentary and/or multifilamentary threads of a thermoplastic plastics material such as, for example, PA or PE. The multifilamentary threads during bending of the hose 10 lay flatly against the hose 10 on the tension side and compress on the compression side of the hose 10 transversely to the thread and thus also towards the wall 12 of the hose 10, so that the braiding 42 always bears against the wall 12. In a particularly advantageous mixture ratio of 50% multifilamentary threads to 50% monofilamentary threads the braided surface of the hose 10 in addition always remains closed. The electrically conductive thread in an embodiment, which is not illustrated here, can thus be held in position at the wall by the braiding even without the adhesive strip covering it, wherein in fact through suitable placing of the electrically conductive track at the elevations of the profiling it is ensured that the electrically conductive thread crosses the electrically conductive track under contact and thus makes electrical contact.

[0077] The afore-described hose 10 can in principle be produced as a roll product at the hose manufacturer and, for example, be supplied to the manufacturer of relevant terminal equipment such as, for example, vacuum cleaners, where further making-up of the hose 10 is then carried out, which usually comprises cutting the hose 10 to length and providing the hose 10 at the ends with use-specific end members. However, it is also possible—and frequently the case—that the hose manufacturer further makes up the hose 10.

[0078] In the embodiment in FIGS. 1 and 2 the hose 10 is cut to length and provided at the two mutually remote ends 32, 34 with a hose mounting member 44, 46 of an electrically conductive material, by way of which a desired conducting away of electrostatic charges to, for example, terminal equipment and the grounding thereof can take place. Two different forms of hose mounting members 44, 46 are illustrated by way of example at one and the same hose 10 in FIGS. 1, 2, 4 and 5. These hose mounting members 44, 46 can optionally be connected or provided with a further use-specific end piece (not shown) so as to provide, for example, a connection geometry adapted to the specific use, but often also so as to provide a possibility of relative rotation between hose mounting member and end piece. Such hose mounting members and end pieces are familiar to the expert so that there shall be only brief discussion in the following of how the respective hose mounting member 44, 46 is secured to the wall 12 of the hose 10 and in that case an electrical contact between the electrically conductive thread 30 and the respective hose mounting member 44, 46 is effected.

[0079] In the hose mounting member 44, which is on the left in FIGS. 1 and 2 and the outer-side profiling 20 of which is helical as previously described, of the hose 10 the end 32 of the hose 10 is screwed together with the helical profile 20 in an associated internally threaded section 48 of the annular hose mounting member 44. A screw connection of that kind—which is reversible—has the advantage that in the case of, for example, a damaged hose 10 the hose mounting member 44 can be unscrewed, the hose 10 can be newly cut to length with removal of the defective hose region and then newly made up to finished state without problems by screwing back on the hose mounting member 44. In this form of securing, the electrically conductive thread 30 is clamped between the profiling 20 and the internally threaded section 48 with formation of an electrical contact. This is illustrated by way of example on the left in FIG. 4, where an end 49, which projects beyond the adhesive strip 40, of the electrically conductive thread 30 undergoes clamping of that kind.

[0080] On the other hand, in the case of the hose mounting member 46, which is on the right in FIGS. 1 and 2, of the hose 10 the end 34 of the hose 10 is plugged into an associated—here substantially hollow-cylindrical—receiving section 50 of the annular hose mounting member 46 and glued to the hose mounting member 46 by an electrically conductive adhesive 52. As indicated in FIG. 5 on the right by a dashed line, the electrically conductive thread 30 extends by an end 53, which protrudes beyond the adhesive strip 40, into the electrically conductive adhesive 52 with formation of an electrical contact.

[0081] A method of producing the flexible hose 10 sofar as described comprises in general the following three method steps a) to c): In a first step a), formation is carried out of a basic hose comprising the wall 12 which by its inner side 14 delimits the cavity 16 about the longitudinal axis 22 and has at least at its outer side 19 the profiling 20 which as seen in section has the wave shape with elevations 24 and depressions 26, wherein the wall 12 in its entirety is formed from an electrically conductive material or at least the electrically conductive track 28 at the outer side 18 of the wall 12, so that the electrically conductive track 28 extends around the wall 12. The basic hose produced to that extent is in principle already capable of use, i.e. no specific requirements with respect to the capability of dissipating electrostatic charges are imposed thereon, thus this basic hose can already be made up by cutting to length and providing it with suitable end pieces.

[0082] Only in a following step b) is the application now carried out, in the case of higher demands on the hose 10 with respect to capability of conducting away electrostatic charges, of the at least one electrically conductive thread 30 to the outer side 18 of the wall 12, so that the electrically conductive thread 30 extends substantially along the longitudinal axis 22 and transversely to the electrically conductive track 28. In other words, in this step the encircling electrically conductive track 28 is short-circuited or at least prepared for that purpose by the electrically conductive thread 30.

[0083] In order, finally, to maintain this electrical state in further processing and in later use of the hose 10 or bring about that state for that purpose, securing of the at least one electrically conductive thread 30 to the outer side 18 of the wall 12 is carried out in a further step c) so that the electrically conductive thread 30—permanently—electrically contacts the electrically conductive track 28. This securing can, as already mentioned above, be effected by attaching or applying the adhesive strip 40 and/or the braiding 42 to the outer side 18 of the wall 12 of the hose 10.

[0084] Preferred sub-steps of the step a) of forming the basic hose comprise, as already similarly discussed above, initially a sub-step in which the profile 36 is extruded from an electrically conductive plastics material or co-extruded from two plastics materials of different electrical conductivity so that the profile 36 has at least the electrically conductive track 28 even if not fully electrically conductive. In a further sub-step the profile 36 is thereupon helically wound for formation of the wall 12 of the basic hose, wherein adjacent windings of the profile 36 are media-tightly connected together by, for example, the hot-melt adhesive 38, as is known per se.

[0085] With respect to rapid and efficient mass production of hoses 10 it is particularly preferred if the steps b) of applying and c) of securing the electrically conductive thread 30 to the outer side 18 of the wall 12 are performed at the same time. A device which can be used for that purpose is described further below.

[0086] Finally, after the step c) of securing the electrically conductive thread 30 to the outer side 18 of the wall 12 the afore-described hose mounting member 44, 46 of an electrically conductive material can, for example, be attached to one or both of the mutually remote ends 32, 34 of the hose 10, which is cut to length as desired or necessary, and electrically contacts the electrically conductive thread 30.

[0087] Details of a device 54 for application of an electrically conductive thread 30 (or several electrically conductive threads 30) to the outer side 18 of, for example, the afore-described flexible hose 10, can be inferred from FIGS. 7 to 14. The device 54 has a frame 56, which in the illustrated embodiment is assembled from aluminum sections and at which the individual components or subassemblies of the device 54 are arranged. As FIGS. 7 to 9, in particular, show, the frame 56 is constructed in the manner of a ladder frame with two longitudinal profile members 58 fixedly connected together by a plurality of transverse profile members 60.

[0088] A hose rest 64 consisting of an elongate angle profile member with a V-shaped cross-section is erected on the transverse profile members 60 of the frame 56—see, in particular, FIGS. 7 and 8 on the lefthand side and FIG. 9 on the righthand side—by way of mounting profile members 62, the angle profile member being secured to the mounting profile members 62 by way of securing straps 66. As FIGS. 7 to 13 show, the hose support 64 serves for reception of the hose 10, which is to be equipped with the electrically conductive thread 30 and which automatically moves into a stable, lower end position in the hose support 64 by virtue of the V-shape of the hose support 64.

[0089] A core component of the device 34 is an applicator 68 for the electrically conductive thread 30, which—as described in more detail in the following—has a rotatable applicator wheel 70 similar to a stock wheel or cell wheel (see FIGS. 10 and 12 to 14), the electrically conductive thread 30 being fed to the outer circumference of the applicator wheel and the applicator wheel being adapted to enter into interlocking engagement with the profiling 20 of the hose laid in the hose support 64. As a result, when rotation of the applicator wheel takes place there is a relative advance movement between hose 10 and applicator 68 in which the applicator wheel 70 applies the electrically conductive thread 30 to the profiling 20 of the hose 10 along the longitudinal axis 22 of the hose 10 while following the elevations 24 and depressions 26.

[0090] In the illustrated embodiment the arrangement is such that the hose support 64 is mounted in stationary position at the frame 56, whereas the applicator 68 comprises an applicator carriage 72 which carries the applicator wheel 70 in a manner still to be described and—as can be clearly seen in a comparison of FIGS. 7 to 9—is guided at the frame 56 to be displaceable along the hose support 64 (cf. also the double arrow 74 for the longitudinal movement in FIGS. 10, 11 and 14). For that purpose, the longitudinal profile members 58 of the frame 56 are each provided at the upper side thereof with a respective continuous guide groove 76 in which on each side of the frame 56 a pair of profile sliders 78 engage to be capable of sliding, the sliders for their part being fixedly connected with the applicator carriage 72. The applicator carriage 72 itself is, in the illustrated embodiment according to, in particular, FIGS. 10 to 14, again assembled from a plurality of aluminum profile sections, of which one profile section extends as cross member 80 over the hose support 64.

[0091] The applicator 68 further comprises an applicator arm 82, on which the applicator wheel 70 is rotatably mounted in a manner still to be described and which is pivotable with respect to the hose support 68 about a selectively definable pivot axis 84, which can be best seen in FIGS. 11 and 14 (cf. also the double arrow 86 for the pivot movement in these figures). For that purpose, the applicator arm 82 is pivotably coupled to the cross member of the applicator carriage 72 with the assistance of a joint 88 with a clamping lever 90. If the clamping lever 90 is fixed, then the applicator arm 82 is fixed in its respective angular position about the pivot axis 84. Thereagainst, when the clamping lever 90 is released, the applicator arm 82 can pivot about the pivot axis 84.

[0092] According to FIG. 14 the pivot axis 84 and the applicator wheel 70 are disposed at mutually remote ends of the applicator arm 82. As can be further seen particularly in FIGS. 10 and 14, the applicator arm 82 together with the applicator wheel 70 and its pivot axis 84 is so arranged with respect to the hose support 64 that a torque about the pivot axis 84 in the direction of the hose support 64 results and, in particular, due to the intrinsic weight of the applicator arm 82 and the components or subassemblies mounted thereon. As a consequence of this torque the applicator wheel 70 is pressed against a hose 10, which is placed in or at the hose support 64, and kept in engagement with the profiling 20 thereof.

[0093] If need be, the applicator arm 82 can also be manually pushed in the direction of the hose 10 and then fixed in this pressing position by fixing the clamping lever 90. In a variant, which is not illustrated in the figures, the applicator arm 82 can in addition also be resiliently biased about its pivot axis 84 in the direction of the hose support 64, for example by a tension spring, which is arranged to be effective in terms of actuation between the applicator arm 82 and lower part of the applicator carriage 72.

[0094] It will be evident to the expert that by these measures the applicator wheel 70 can be reliably held in engagement with the profiling 20 of the hose 10 resting on the hose support 64. In that case, hoses 10 with different diameters and shapes (for example substantially cylindrical or conical) can be processed, i.e. provided with an electrically conductive thread 30.

[0095] As, moreover, can be best inferred from FIGS. 10, 11 and 14, the applicator arm 82 has a head part 92 consisting of an aluminum profile section, on which further components or subassemblies of the applicator 68 are mounted as described in the following. These components and subassemblies are in detail a feed device 94 for the electrically conductive thread 30, a feed device 96 for the adhesive strip 40, a guide roller arrangement 96 with a pair of guide rollers 100, 102 for combining the electrically conductive thread 30 with the adhesive strip 40 before transfer to the applicator wheel 70 takes place, and a mounting and drive arrangement 104 for the applicator wheel 70.

[0096] According to FIGS. 10, 11 and 14 initially the guide roller arrangement 98 is mounted by a mounting profile section 106 at the top on the head part 92 of the applicator arm 82 so that the guide rollers 100, 102 are disposed above the applicator wheel 70 in a position aligned with respect to the applicator wheel 70, as can be clearly seen in FIGS. 12 and 13. The guide rollers 100, 102 are in that case rotatably mounted in cantilever manner on the mounting profile section 106 in a suitable way.

[0097] In addition, a roll holder 108, at the free end of which an adhesive strip roll 110 is rotatably mounted and, in particular, similarly in cantilever manner, of the feed device 96 is mounted on the side of the head part 92 and the mounting profile section 106 remote from the pivot axis 84. According to, in particular, FIGS. 12 and 13 the adhesive strip roll 110, which is arranged with the axis of rotation thereof above the guide roller arrangement 98, is similarly disposed in alignment with the guide rollers 100, 102.

[0098] Moreover, a spool holder 112, which in the illustrated embodiment carries four spools 114 with electrically conductive threads 30, the spools being rotatably plugged onto parallel axle pins (not illustrated), of the feed device 94 is mounted at the top on the mounting profile section 106. A fastening angle member 116 for an end of a hose 118, the other end of which is secured by a bracket 120 laterally to the mounting profile section 106, is mounted on the end of the spool holder 112 remote from the adhesive strip roll 110. Finally, this bracket 120 also holds a tubelet 122 for the feed, more precisely guidance of the electrically conductive threads 30 to the guide roller arrangement 98.

[0099] In this respect it is apparent that the adhesive strip 40 can be unrolled from the adhesive strip roll 110 of the feed device 96 and fed to the guide roller arrangement 98. At the same time electrically conductive threads 30 can be unspooled from the spools 114, collected by way of the hose 118 and—guided through the tubelet 122—fed to the guide roller arrangement 98, where the electrically conductive threads 30 are combined with the adhesive strip 40.

[0100] Moreover, a mounting block 124 of the mounting and drive arrangement 104 for the applicator wheel 70 is mounted below the head part 92 of the applicator arm 82. In the illustrated embodiment the mounting block 124 is of two-part construction, with a part which is on the left in FIG. 13 and in which a drive shaft 126 for the applicator wheel 70 is rotatably mounted by way of two roller bearings, and a part which is on the right in FIG. 13 and on which an axle pin 128 for mounting of the applicator wheel 70 is mounted by way of a roller bearing at the wheel side. In addition, a preferably electrically rotary drive 132, which is in driving connection with the applicator wheel 70 by way of the drive shaft 126, is flange-mounted on the side, which is at the left in FIGS. 12 and 13, of the mounting block 124 by way of a mounting flange 130.

[0101] Finally, further details with respect to the applicator wheel 70 can be inferred from FIGS. 10 and 12 to 14. Accordingly, the applicator wheel 70 has between two hub sections 134, 136 a plurality—in the illustrated embodiment five (see FIG. 14)—of axle pins 138 uniformly distributed over the circumference. The axle pins 138 each rotatably mount a respective hollow-cylindrical sleeve 140 as pressing body for the electrically conductive thread 30. It can also be inferred from FIG. 13 that the hub section 134, which is at the left in this figure, of the applicator wheel 70 is connected with the drive shaft 126 in the manner of a coupling to be secure against relative rotation, whereas the hub section 136, which is on the right in this figure, of the applicator wheel 70 receives the roller bearing which co-operates with the axle pin 128 in the mounting block 124 of the applicator wheel to provide rotational mounting.

[0102] As, in particular, FIGS. 10 and 14 show, the adhesive strip 40 combined with the electrically conductive threads 30 is guided, starting from the guide roller arrangement 98, through a slot-like cut-out 142 in the head part 92 of the applicator arm 82 and in the mounting block 124, which is mounted thereon, to the applicator wheel 70, by way of which the electrically conductive threads 30 are applied and secured under the adhesive strip 40 to the outer side 18 of the hose 10. In that case the applicator wheel 70, the sleeves 140 of which engage in interlocking manner with the profiling 20 of the hose 10, roll along on the hose 10.

[0103] It will be apparent that through driving the applicator wheel 70 by the rotary drive 132 not only the electrically contacting application and securing of the electrically conductive threads 30 to the hose 10 thus take place, but also the advance movement between the applicator 68 and the hose 10, which rests on the hose support 64, is generated, in which the applicator carriage 72 as shown in FIGS. 7 to 9 moves over the hose support 64 fixed at the frame 56. At the end, the hose 10, the electrically conductive track 28 of which is through-plated or short-circuited by way of the applied electrically conductive threads 30, can be removed from the hose support 64 by the device 54 before the further making-up of the hose 10 is carried out by possible further cutting of the hose to length and attachment of the hose mounting members 44, 46.

[0104] A flexible hose, particularly vacuum cleaner hose, has a wall which by an inner side delimits a cavity for the conveying of media and has at least at an outer side a profiling which as seen in section along a longitudinal axis of the hose has elevations and depressions. At least one electrically conductive track, which extends around the wall and is in electrically contact with at least one electrically conductive thread which electrically connects mutually remote ends of the hose, is provided at the outer side of the wall. The electrically conductive thread, which extends substantially along the longitudinal axis of the hose and transversely to the electrically conductive track, is secured to the outer side of the wall, whereby the hose in the case of use of a comparatively small amount of electrically conductive materials has improved suitability for recycling. In addition, a method for producing such a hose and a device usable for that purpose are proposed.

REFERENCE NUMERAL LIST

[0105] 10 hose [0106] 12 wall [0107] 14 inner side [0108] 16 cavity [0109] 18 outer side [0110] 20 profiling [0111] 22 longitudinal axis [0112] 24 elevation [0113] 26 depression [0114] 28 electrically conductive track [0115] 30 electrically conductive thread [0116] 32 end [0117] 34 end [0118] 36 profile [0119] 38 hot-melt adhesive [0120] 40 adhesive strip [0121] 42 braiding [0122] 44 hose mounting member [0123] 46 hose mounting member [0124] 48 internally threaded section [0125] 49 end [0126] 50 receiving section [0127] 52 electrically conductive adhesive [0128] 53 end [0129] 54 device [0130] 56 frame [0131] 58 longitudinal profile member [0132] 60 transverse profile member [0133] 62 mounting profile member [0134] 64 hose support [0135] 66 securing strap [0136] 68 applicator [0137] 70 applicator wheel [0138] 72 applicator carriage [0139] 74 double arrow (axial movement) [0140] 76 guide groove [0141] 78 profile slider [0142] 80 cross member [0143] 82 applicator arm [0144] 84 pivot axis [0145] 86 double arrow (pivot movement) [0146] 88 joint [0147] 90 clamping lever [0148] 92 head part [0149] 94 feed device [0150] 96 feed device [0151] 98 guide roller arrangement [0152] 100 guide roller [0153] 102 guide roller [0154] 104 mounting and drive arrangement [0155] 106 mounting profile section [0156] 108 roll holder [0157] 110 adhesive strip roll [0158] 112 spool holder [0159] 114 spool [0160] 116 fastening angle member [0161] 118 hose [0162] 120 bracket [0163] 122 tubelet [0164] 124 mounting block [0165] 126 drive shaft [0166] 128 axle pin [0167] 130 mounting flange [0168] 132 rotary drive [0169] 134 hub section [0170] 136 hub section [0171] 138 axle pin [0172] 140 sleeve [0173] 142 slot-like cut-out