DE2804251A1 - HOSE, IN PARTICULAR VACUUM CLEANER HOSE AND PROCESS FOR ITS MANUFACTURING - Google Patents

Description

Patent attorney

January 31, 1978 FiFs t Street
, Ohio, 45401

UNITED STATES.

DavcQ CorDoration

333 W. Plist Street

Dayton, Ohio, 454oi A36 Oll whw

Hose, in particular vacuum cleaner hose and process for its manufacture

The invention relates to a reinforced, flexible, outside wrapped and inside smooth hose, in particular a vacuum cleaner hose and a method for its manufacture.

Flexible, elastomeric hose constructions with smooth inside are widely used in industry, particularly for pumping various types of fluids. For many of the types of application mentioned here often require special hose constructions. So are for example For use in conjunction with vacuum cleaners, flexible vacuum hoses are required, which have a smooth, twisted shape have free inside to avoid air turbulence as well to avoid such as the settling and accumulation of dust and dirt on the inside windings. At the same time these are But hoses are provided with twisted outer sides in order to obtain a compression reinforcement in this way and at the same time also the sliding properties of the hose over the respective To improve flooring, for example carpet.

Many of the previously known vacuum cleaner hoses are made from helically wound strips in order to in this way to achieve maximum flexibility of the hose. Each of the hoses constructed and manufactured in this way shows zv / angläne but an inner surface that has countless turns

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which cause turbulence and promote the settling of dust as mentioned above. Other Although vacuum cleaner hoses have a smooth inner surface, they are relatively thick-walled. This inevitably leads reduced flexibility. Other other known hose constructions are far too expensive to to be used in practice at all. All in all the known hose constructions can therefore not yet meet the requirements placed on them.

The invention is accordingly based on the object of providing a hose, in particular a vacuum cleaner hose create, which is simple and economical to manufacture in terms of its structural design and thus avoids the aforementioned powers. The invention is also intended to provide a corresponding pier setting method be recorded.

With a view to solving this problem is a erfindungsgernäßer Hose of the type mentioned above characterized by a thermoplastic inner hose, the Inside of the hose forming the inner surface is smooth, and reinforcements, which are helically wound around and are arranged against the inner tube without being in it to be embedded, with the reinforcements at least partially consist of thermoplastic material, and form the outer winding of the hose, with the inner hose a wall thickness ensuring the flexibility of the hose to v / one and the reinforcement without restriction the flexibility of the key with regard to essential

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borrowed pressure differences between that transported through the hose Fluid and the environment is designed.

Further details and features of the invention emerge from the claims and the following description in which the invention is explained in more detail using exemplary embodiments. Show it:

Figure 1 is a schematic representation, on the basis of which the inventive Process for the production of a hose according to the invention with the typical comparisons in this regard. procedural steps is explained,

FIG. 2 shows a tube piece of a tube according to the invention, partly in view, partly in section, the hose shown being made by a method according to FIG is made

Figure 3 shows a further embodiment of a hose according to the invention, again in cross section through a Hose section,

FIG Λ in the Figure 3 section corresponding to a wall portion of another erfindungsgemnßen hose construction, and

Figure 5 in the Figure 4 illustration corresponding ei na more Ausführungsf orm an erf indunq.'sgenuiß au i 'th job au ski Auches.

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Figure 2 shows a first embodiment of the invention constructed hose 20 in its details. The hose 20 is more common and known using it Method steps produced, a method 21 according to FIG. 1 preferably being used for its production finds. The hose 20 is reinforced, comparatively very flexible and has a large number of outer surfaces with a smooth inside and outwardly extending coils 23.

The hose 20 is preferably made of one or more elastomeric materials Materials, in particular thermoplastics produced and includes a thermoplastic inner tube 24, the Inner surface of the entire tube 20 forming the inner surface is smooth. The hose 20 further comprises reinforcements 25, which are arranged helically coiled on and against the inner tube 24 without being embedded in it be, as this is particularly visible in some places designated by 26. How to arrange the reinforcements in order to optimally reinforce the tube 20 without being embedded in the inner tube 24, the following Description still clarified.

The inner tube 24 has a comparatively small wall thickness in relation to its inner diameter, from which it can be seen favorable conditions for the flexibility of the overall hose result. They also allow the reinforcements 25 the transport of fluid through the entire hose 20, without restricting its flexibility, even with significant pressure differences between the conveyed fluid and the environment. Accordingly, through the hose

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both fluids, such as air under negative pressure, as well as fluids transported under overpressure. In addition to gas, liquids or mixtures can also be used as fluids of liquids and gases in question.

The reinforcements 25 of the hose 20 are designed as untensioned reinforcing elements 31 which are helical are arranged coiled over and against the outside 32 of the inner tube. The reinforcing elements 31 in turn are wrapped helically by means of a strip 33 and held firmly against the inner tube 24 via this. The reinforcement element 31 and the strip 33 are arranged so that neither the reinforcing element nor the strip in the Inner tube 24 is embedded, but the arrangement of these parts is such that a bulging of the inner tube is excluded. The reinforcements 25, which are formed by the reinforcement element 31 and the strip 33, determine the outer coiled configuration of the overall tube 20.

The reinforcing element 31 used in this exemplary embodiment is a wire or stranded wire, in particular a metallic one Wire 34 formed. A sheath part 35, in particular made of thermoplastic material, surrounds the wire 34 The thermoplastic material of the envelope part 35 is compatible with the thermoplastic material from which the inner tube is made 24 is made. The reinforcing element 31 can thus be positioned against the inner tube 24 by the action of heat fused or connected via adhesive, whereby the corresponding connections (fusing, gluing)

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between the envelope part 35 and the inner tube 24 at some selected points 36 are shown.

The strip 33 is preferably made of thermoplastic material as an elastomeric strip. The strip 33 has a width 37 which allows any helical Winding of the strip two directly adjacent bonds of the reinforcement element 31 covered.

The reinforcing element 31 is preformed into a spiral and designed so that the resulting helical V / endel has an inner diameter which is essentially the outer diameter 40 of the inner tube 24 corresponds. The inner tube 24 is a heat-set tube and the sections of the reinforcement element 31 and the strip 33, which are heat-set, are also heat-set. Accordingly, the preformed Reinforcing element 31, which mainly cooperates with the heat-set inner tube 24, the retention the smooth inside of the overall hose 20. The smooth, The inside formed by the inside surface 22 is free of inwardly directed bulges and inside turns, so that an unhindered, non-turbulent flow of the respective fluid is guaranteed.

As already explained earlier, the turns 23 of the overall hose 20 are determined by the reinforcing element 31 and the cooperating strips 33. The inner tube 24 has a minimum wall thickness 30, which is about

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corresponds to the maximum thickness of the reinforcing element 31 and is approximately the same in the present exemplary embodiment to the diameter of the envelope part 35 is. The hose 20 is preferably using that illustrated at 21 in FIG Process produced, this process running continuously. In this process, a number straight mandrels - indicated schematically by the arrows 43 - of relatively great length, namely with Lengths of about 15 m or more moved continuously through the various stations. Every mandrel runs in detail 43 first through a cross-head extruder 44 of known construction and it is in this the thin-walled inner tube 24 produced, whereby it is extruded as a seamless tube over the can, so that following station 44 a mandrel 45 covered by the hose results.

The mandrel covered by the tube 24 is then cooled in the area 46 and then runs into a wire winding station 47, in which the reinforcing element 31 forms a spiral is prewound, the inner diameter of which corresponds essentially to the outer diameter 40 of the inner tube 24. use you can find the devices known for this purpose here. Such a device is used that Reinforcing element to be continuously applied to the mandrel 45 covered by the hose, so that the reinforcing element comes to rest against the outside 32 of the hose 24 without being embedded therein.

The mandrel 45 covered by the hose with the

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The next reinforcement element is then moved into the winding station 50 where the strip 43 is wound thereon. Even for this purpose known. ', related.' Devices Find use. There is now a complete hose as shown in FIG. 2, and this hose emerges from the winding station 50 at 52.

The entire hose 20 is then continuously brought into an oven 54, specifically for heat-setting the hose, with this takes place in particular in such a way that the substance of the inner tube hardens and has a smooth, winding, Indentations or the like free inner surface 24 is given. Simultaneously with the heat setting in the oven 54, the Heat fusion of the envelope part 35 with the outside 32 of the inner tube 24 is achieved, as indicated at 36 is. In addition, there is also the bond between the strip 33 and the outside 32.

The entire hose 20, which is now heat-set, is then cooled in the cooling station 55, so that now the entire hose construction 20 is determined. The entire length of the hose extends over several mandrels, and the hose is now cut to length at the opposite ends of a mandrel 43, so that the finished length of a piece of hose corresponds to the length of a mandrel. The mandrels 43 are then then removed from the respective hose pieces 20, using the techniques known for this purpose. The mandrels removed from the hose are in turn grounded, as illustrated by arrow 56, in front of the cross-head extruder 44 returned, so that the process described can run again.

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Further embodiments of hoses designed according to the invention are shown in FIGS. 3, 4 and 5, and FIG these embodiments are basically quite similar to those already described. Therefore also find the for them FIGS. 3 to 5 use the reference numerals 20A, 20B and 20C respectively, hose constructions to be seen. Corresponding Indexed reference numerals are also used for the other parts, parts corresponding to one another having the same reference numerals so that a further detailed description is not necessary.

The overall hose 20A according to FIG. 3 has an inner hose 24A, a reinforcing element 31A and a strip 33A. The strip 33A is helically wound so that each turn thereof is over and against an associated corresponding one Winding of the reinforcing element is applied. The strip 33A has opposite side edges 60A, and the overall arrangement of the strip 33A is such that the side edges 60A of the turns are respectively attached to the corresponding Side edges of adjacent turns are in contact. The abutting edges that are formed are denoted by 61A. the outwardly protruding beads are in this construction by a reinforcing element 31A and the 'these overlapping individual layer of a strip 33A is formed, while in the exemplary embodiment according to FIG. 2, a double overlap was given in the area of the reinforcement elements. In the embodiment of the overall hose according to FIG. 3 20A, each strip 33A, when viewed in cross-section, has a U-shaped bulging central

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section 62A, to which leg 63A protruding laterally on both sides connect. The reinforcement member 31A is arranged within the U-shaped bulging central portion 62A.

In the exemplary embodiment according to FIG. 4, the overall hose 20B has an inner hose 24B, a reinforcing element 31B and a strip 33B. The strip 33B is designed as a preformed strip which, in cross section considered, an approximately semicircular central section 64B and thereon on opposite sides adjoining lateral, tapering legs 65B. The width of the legs 65B is dimensioned so that between successive ones over the length of the hose Turns of the strip 33B leave uncovered portions 66B.

In the hose construction 2OC according to FIG. 5, in addition to the inner hose 24C, reinforcements 25C in the form of a single lumpy element 67C is provided. Element 67C is helical over and around inner tube 24C wrapped. The element 67C comprises a strip 7OC which is rectangular in cross-section and which is in the central portion with a reinforcing, substantially semicircular bead 71C is provided. Element 67C is preferably all off thermoplastic material.

The strip 7OC has opposite side edges 72C. If an element 67C is wound in a helical

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arranged around the inner tube 24C, the edges 72C of successive turns of the strip 7OC come against each other to the plant. The strip 7OC, and in a corresponding manner also the element 67C, are on the outside 32C of the inner tube 24C, namely by hot melting or by gluing, as is at 73C. The semi-circular, outwardly protruding reinforcement bead 71C of the element 67C forms the outer annular beads of the entire tube when the strip 7OC is wound around the inner tube 24C 20C.

The hose constructions 20A, 20B and 20C are constructed similarly to one another and in comparison to the hose construction 2O and to be produced in each case by a method 21 according to FIG. 1. The reinforcement members 31A, 31B and 67C are preferably attached to the respective inner tube by hot bonding. In addition, however, it is also possible make the desired connection by adhesive, dissolving agent or the like and it is then the inner tube connected to the respective reinforcement element by gluing or cold welding.

In the hose constructions according to FIGS. 2 to 4 - hoses 20, 20A and 20B - there is a reinforcing element in each case 31, 31A or 31B use, which is provided centrally with a metallic wire, which is preferably a thermoplastic Enclosure - envelope part 35 - has. A simple wire can be used as the wire for the respective reinforcement element Find reinforcement wire use. It can, however, also be in the form of an electrical line which,

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what is not shown here is grounded for purposes known in this regard. Instead of a single wire that is arranged helically wound around the inner tube, but can also have a plurality of electrical conductors, thus, for example, a double-core cable can be used, the wires in a corresponding manner are isolated. Such a reinforcing element formed by a multi-core cable is also helical wound then arranged on the inner tube and connected to it, so that the cable at the same time a reinforcement for the inner tube.

The strips covering the reinforcing elements 31, 31A or 31B can also be made of thermoplastic material exist, and they can also be held in their respective positions by hot melting or suitable adhesives be.

In each of the described embodiments, the inventive Hose maximum flexibility, a smooth inner surface free of turns or indentations and a Inner tube that has a minimal thickness with regard to the desired maximum overall flexibility of the tube Has. Due to the fact that the inner tube has a helical shape wound reinforcements is supported without the reinforcements embedded in the hose would be, on the one hand, is the desired high level of flexibility achievable, but also ensures that the hose, according to the respective differential pressure for Environment, not in under external pressure and under internal pressure

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not bulging. Fluids under negative pressure as well as overpressure can thus pass through the hose led v / earth. In addition, the bead-like turns on the outside ensure that it is ribbed in this way Surface for the entire hose that has good sliding properties with low friction and low wear of the hose compared to the respective support.

The use of thermoplastic material for the inner tube has already been mentioned. Likewise, the use of thermoplastic material for the encasing of the 'respective Reinforcement wire or for the construction of the reinforcement element 67C for hose construction 2OC. The thermoplastics usually provided for such purposes are suitable as thermoplastic materials.

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Claims (15)

Patent attorney
DIp! .-! Ng. % a »er JeckJaciJ 2 BO 4 2 5 1 2Stuttgart N. MenzelstraBe4fl Dayco Corporation Dec. January 1978 W. First Street A 36 Oll whw Dayton "Ohio 45401
United States Expectations \ .J Reinforced, flexible hose wrapped on the outside and smooth on the inside, in particular a vacuum cleaner hose, characterized by a thermoplastic inner hose (24-24G) whose inner surface (22) forming the inner side of the hose is smooth, and reinforcements (25-25C) which are arranged helically wound around and against the inner tube (24-24C) without being embedded in it, wherein the reinforcement consists at least partially of thermoplastic material and forms the outer wrapping of the tube, the inner tube (24) also having the flexibility of the Hose ensuring wall thickness (30) and wherein the reinforcement is designed without restricting the flexibility of the hose with regard to substantial pressure differences between the fluid transported through the hose and the environment. 2. Hose according to claim 1, characterized in that the reinforcements (25C) are made entirely of thermoplastic Material consisting of strips (70C) are formed, which have a reinforcing bead (71C) and the outer wrapping of the hose. - 2 - 809850/0579 3. Hose according to claim 1 or 2, characterized in that the strip (7OC) fused against the inner hose or is glued. 4. Hose according to claim 1, characterized in that the reinforcements (25-25B) on and around the inner hose (24-24B) helically coiled reinforcing element (31-31B) with an outer, the section of thermoplastic material limiting envelope part (35) and a strip (33-33B) which envelops the reinforcement element in a helical manner and holds it against the inner tube. 5. Hose according to claim 4, characterized in that the reinforcing element (31-31B) to an inner diameter is pre-wound, which corresponds to the outer diameter of the inner tube (24-24B) and that the so constructed Tube is hot-meltable with a view to maintaining the smooth inner surface of the inner tube. 6. Hose according to claim 4 or 5, characterized in that the wall thickness (30) of the inner hose (24-24B) corresponds approximately to the maximum thickness of the reinforcement element (31 31B). 7. Hose according to one of claims 4 to 6, characterized in that that the strip (33-33B) is designed as a helically wound plastic tape and over several successive turns of the reinforcement element (31) extends and that the outer wrapping is determined by a double layer of this tape. 809850/0579 - 3 - 8. Hose according to one of claims 4 to 6, characterized in that that the strip is wound as a single-ply tape with adjacent edges. 9. Hose according to one of claims 4 to 6, characterized in that that the strip (33B) through a preformed plastic strip with a cross-section approximately semicircular middle part and laterally then tapering in cross section Legs (65B) is formed. 10. Process for producing a reinforced, flexible, outside wrapped and inside smooth hose, in particular according to one of the preceding claims, characterized by the steps of manufacturing a thermoplastic inner tube (24) with a wall thickness that ensures flexibility and with a smooth inner surface (22) that forms the inside of the hose and the one that is coiled in a helical manner Arrangement of reinforcements (25) on and around the inner tube (24) without affecting the reinforcements in the Embed the inner tube. 11. The method according to claim 10, characterized in that in the arrangement of the reinforcements, reinforcements (25C) in the form of completely thermoplastic material Strip (70 C) and with a section (reinforcement bead (.7.1C), which determines the outer wrapping of the hose. - 4th 809850/0579 12. The method according to claim 11, characterized in that the strip is fused with the inner tube. 13. The method according to claim 10, characterized by the steps of helically winding a Ver- reinforcing element (31), which has a outer part made of thermoplastic material, on and around the Inner tube (24) and the helical ^ winding a strip (33) around the reinforcement element to hold it against the inner tube. 14. The method according to claim 13, characterized in that the reinforcing element in the helical winding (31) is pre-bent to an inside diameter which corresponds approximately to the outer diameter of the inner tube (24). 15. The method according to any one of claims 10 to 14, characterized by hot melting the individual parts of the hose to ensure the maintenance of the smooth Hose.! tmenf lc'che. 80 9 850/0579