EP3276635A1 - Rubber or plastic hose line and method for its manufacture - Google Patents

Abstract

The invention relates to a rubber or plastic hose, which comprises at least three cores enclosing each with an insulation, wherein the sheathed with the insulation cores are arranged with an extruded jacket made of rubber or plastic, wherein the sheath comprises two areas which have a different color ,

Description

Field of the invention

The invention relates to a rubber or plastic hose line, which is designed as a cable for electrical current. Furthermore, the invention relates to a method for producing a rubber or plastic hose line.

Background of the invention

Rubber or plastic hose lines are known. These are used, for example, for extension cables or cable drums. In the interior, mainly lines with a plastic casing, such as a PVC sheathing, are used in practice. In the outdoor area, in particular for electric garden tools, however, more robust and less sensitive to UV radiation rubber hose lines are used.

Both plastic pipes and rubber hose lines are available in different colors. The rubber hose lines used outdoors are available in practice, for example in the colors red and black. The disadvantage is that the known monochrome lines are not clearly visible on any surface. For example, red rubber hose lines on red sandy soils, such as those used for tennis courts or raceways, are difficult to recognize.

This is associated with a corresponding risk of accident, for example, because the line is damaged with an electrical device, such as a lawnmower, or because of the not easily recognizable line tripping hazard.

Object of the invention

The invention is based on the object to improve the mentioned disadvantages of the prior art.

It is in particular an object of the invention to provide a rubber or plastic hose line whose visibility is improved even with different substrates.

Summary of the invention

The invention is already achieved by a rubber or plastic hose assembly according to claim 1 and by a method for their preparation.

Preferred embodiments and further developments of the invention can be found in the subject matter of the dependent claims, the description and the drawings.

The invention relates to a rubber or plastic hose line, which is designed as an electrically conductive cable. This comprises at least three cores, each sheathed with insulation. Two of these wires are used for connection to phase and neutral, while the remaining conductor serves as a protective conductor.

In a further embodiment, the rubber or plastic hose line is designed as a three-phase line and accordingly comprises four or five wires.

The jacket has a substantially circular cross-section.

More particularly, the invention relates to a rubber or plastic tubing formed as a type H05 or H07 RR, RN or VV cable.

Such lines are used in particular, provided with earthing plugs, for a cable drum or extension line.

The rubber or plastic hose line for this purpose has a length of preferably more than 1 m, more preferably more than 2.5 m, and most preferably more than 4 m.

The insulating sheathing cores are arranged in an extruded jacket made of rubber or plastic, which according to the invention comprises two areas in which the rubber or plastic, of which the sheath is made of a different color.

The invention thus relates to a particular striped trained multicolored cable.

Preferably, the strips extend over the entire length of the cable.

This may comprise 2 or more, in particular 3, 4, 5 or 6 areas, which have a different color from a respectively adjacent area.

Preferably, the jacket is formed of materials of exactly two or exactly three different colors.

In particular, the coat may include the following color combinations: orange / black, red / white, red / black, red / green, yellow / black or red / yellow.

The recognizability of such a striped trained mantle is thus improved in a simple manner.

The wires preferably have a conductor cross-section of 1 to 3 mm ² .

In a preferred embodiment of the invention, the jacket is made of a rubber, in particular of a chloroprene rubber, a silicone rubber or of PVC.

Rubbers and silicones are intended in particular for outdoor use of the cable. If the cable for an extension cable or a Cable drum is used, this preferably comprises a splash-proof earthing contact plug.

The jacket preferably adjoins the insulation of the wires.

In this embodiment of the invention, therefore, the jacket is extruded directly to the insulated wires without further intermediate layer. It has been found that such a multi-colored cable can be produced easily and without further intermediate layers.

It is understood, however, that this does not exclude that the insulation of the wires with a release agent such as talc, is provided before the jacket is extruded.

Preferably, the jacket is formed in a single layer. This is understood to mean that the differently colored layers extend over the entire thickness of the jacket and adjoin one another only at the edge.

Preferably, the sheath comprises (in weight percent) 10-90%, more preferably 30-70% of a first color material and / or 10-90%, preferably 30-70%, of a second color material.

In one embodiment, the sheath comprises a strip of a first color which is narrower than an adjacent area of the sheath of a different color.

In this embodiment of the invention is provided in particular that the jacket comprises one or more narrow strips of a signal color, such as red, yellow or orange.

The invention further relates to an extension or a cable drum comprising a rubber or plastic tubing, which has been described above. The strip or strips preferably have a width of less than 3mm.

Furthermore, the invention relates to a provided with a safety plug connecting cable for electrical appliances, especially garden tools, such as hedge trimmers, lawnmowers, grass trimmers, tools, especially drills and saws and for household appliances such as washing machines and dryers.

Further, the invention includes a method of manufacturing a rubber or plastic tubing described above, wherein the shell is extruded around the insulated wires.

In a preferred embodiment of the invention, the jacket is extruded by means of at least two extrusion machines, wherein a first color is extruded by means of a first extrusion machine and a further color is extruded by means of a second extrusion machine.

In the case of using a thermoplastic such as PVC, the areas of different color are directly on the Extruded jacket, wherein the thermoplastic is so molten that connect the areas of different colors in the molten state with each other cohesively.

In the case of the use of crosslinkable materials, it is provided according to an embodiment of the invention, aufzuextrudieren the jacket and to crosslink immediately thereafter.

In the method according to the invention preferably at least two extrusion machines are used, by means of which the rubber or plastic material is conveyed in the molten state.

These at least two extrusion machines promote the molten rubber or plastic to a Umspritzwerkzeug. In the overmoulding tool, the rubber or plastic is applied in webs, preferably in four webs, to the lines which are guided onto the overmoulding tool.

The overmoulding tool thus has a central channel through which the electrical lines, which are to be encapsulated by means of a multi-colored jacket, are introduced.

Further, the overmolding tool is connected to the two extrusion machines. The design of the extrusion tool determines how many webs are applied in which ratio to the lines.

In one embodiment of the invention, the overmoulding tool is designed such that the rubber or plastic material of an extrusion machine can be extruded onto the conduit in two opposing paths. Thus, with two extrusion machines a rubber or plastic hose line can be produced with four tracks, of which the opposite tracks each have the same color.

In particular, a transfer molding tool is used, which has an insert, in which the channel for insertion of the lines is arranged.

The outside of this insert is provided with at least two dividers, which divide the rubber or plastic in at least two tracks. About the divider, the material is first separated from each other during the introduction of the extrusion machines in webs and then merged to connect even in the molten state cohesively and thus form after curing or crosslinking several webs of different colors.

In a further development of the invention, a transfer molding tool is used, which has a channel, is guided over the extruded rubber or plastic on an opposite side of the line.

This embodiment of the invention is particularly intended to apply four tracks on the lines by means of two extrusion machines. So it creates a Rubber or plastic tubing with a jacket divided into four segments, of which two segments have a first color and two other segments have a second color.

Preferably, the channel is to transport the rubber or plastic material to the opposite side, in the use of Umspritzwerkzeugs. For this purpose, provision is made in particular for the overmoulding tool to be designed in several parts, so that molten material can be passed between an inner part and an outer part.

Brief description of the drawings

• Fig. 1 zeigt eine Schnittansicht eines Ausführungsbeispiels einer erfindungsgemäßen Gummi- oder Kunststoffschlauchleitung.
• Fig. 2 und Fig. 3 sind schematische Seitenansichten eines Abschnitts einer erfindungsgemäßen Gummi- oder Kunststoffschlauchleitung.
• Fig. 4 ist eine schematische Ansicht einer Anlage zur Herstellen einer erfindungsgemäßen Gummi- oder Kunststoffschlauchleitung.
• Fig. 5 ist eine perspektivische Ansicht eines in dem Umspritzwerkzeug der Anlage verwendeten Einsatzes.
• Fig. 6 bis Fig. 8 sind perspektivische Ansichten eines alternativen Ausführungsbeispiels eines Einsatzes, mittels dessen sich vier Gummi- oder Kunststoffbahnen aufspritzen lassen.

The invention will be described below with reference to schematically illustrated embodiments with reference to the drawings Fig. 1 to Fig. 3 be explained in more detail.

• Fig. 1 shows a sectional view of an embodiment of a rubber or plastic hose according to the invention.
• Fig. 2 and Fig. 3 are schematic side views of a portion of a rubber or plastic hose according to the invention.
• Fig. 4 is a schematic view of a plant for producing a rubber or plastic hose according to the invention.
• Fig. 5 is a perspective view of an insert used in the overmolding tool of the plant.
• Fig. 6 to Fig. 8 Fig. 3 are perspective views of an alternative embodiment of an insert by means of which four rubber or plastic sheets can be sprayed on.

Detailed description of the drawings

Fig. 1 is a sectional view of an embodiment of a rubber or plastic hose according to the invention, which is designed as a cable 1.

The cable 1 comprises three electrically conductive wires 4, which are each covered with an insulation 5.

To the insulated wires 4, a jacket 2 is extruded from rubber or plastic.

It is understood that the inside of the shell 2 does not have to form a channel which is circular in cross section, as shown here, but that the jacket 2 can adapt inside to the contour of the insulation 5.

The jacket 2 comprises in this embodiment regions 3a, 3b, which consist of a plastic or a rubber of a different color.

In this embodiment, the jacket 2 is divided into four, seen in cross-section, the same size areas, which each extend to a quarter of the circumference.

Fig. 2 shows a side view of such a cable. It can be seen that in this view, a region 3a and a region 3b can be seen.

Due to the different color of the areas 3a and 3b, the cable 1 is easier to see.

Fig. 3 shows an alternative embodiment of a cable 1 in a side view. In this embodiment, the region 3b is formed as a narrow strip, which is adjacent to the regions 3a. This narrow strip may in particular have a signal color.

Fig. 4 shows a schematic view of a plant for producing a multi-colored rubber or plastic hose line.

The system comprises a Umspritzwerkzeug 9, of which only the housing is shown schematically here.

In the overmolding tool 9, the already insulated lines 7 are inserted on one side to be overmolded with plastic.

After encapsulation come from the Umspritzwerkzeug 9 as a multi-colored rubber or plastic hose line configured cable 1 out and may possibly even further manufacturing steps, such as by crosslinking the still molten material or cooling the same, are subjected.

In order to introduce the rubber or plastic material, the housing of Umspritzwerkzeugs 9 is connected on both sides with a respective extrusion machine 8a, 8b, via which the rubber or plastic raw material is conveyed molten to Umspritzwerkzeug 9.

Such extrusion machines are known from the prior art.

The most important component of the overmolding tool 9 is an insert which is inserted into the housing 9 of the overmoulding tool.

Fig. 5 shows a perspective view of an embodiment of such an insert 10th

The insert 10 is installed in a cylindrical recess of the housing of Umspritzwerkzeugs.

In the lower region of the insert 10 shown here, the rubber or plastic material from the two opposing extrusion machines is introduced from the side.

In this embodiment, the insert at the location in which the material is introduced comprises a Splitter 12, over which the molten material of an extrusion machine is divided and is guided via the channels 14a and 14b in the direction of the lines of the cable to be extruded.

The lines are inserted from a rear side into the channel 11 and are provided on leaving the channel 11 with the multi-colored rubber or plastic jacket.

In order to ensure a clean separation of the material of the two extrusion machines in two tracks, the insert 10 comprises two dividers 15. The dividers 15 separate the material of the two extrusion machines after injection. It is understood that the opposite side of this presentation of the insert 10 is the same or similar.

The dividers 15 are designed such that they run out in the direction of the cable to be extruded, thus connecting the material flowing from the channels 14a and 14b of an extrusion machine above the dividers 15 with the material of the other extrusion machine, forming two separate paths.

The splitter 12, after which an island 13 protrudes and over which the material of an extrusion machine is first divided into two streams along the channels 14a and 14b, serves to divide the material of an extrusion machine into two part streams, which results in a sticking together of the webs of different material the divider 15 improved. The material of an extrusion machine flows after the, in this embodiment, teardrop-shaped, island 13 together again.

Due to the fact that the material has to escape from the island 13 after being injected into the overmolding tool, the material streams coming from the two extrusion machines connect in a secure manner above the dividers 15.

It is understood that in another embodiment of the invention, which is not shown here, but possibly also on the splitter 12 and the island 13 can be dispensed with.

Referring to Fig. 6 to Fig. 8 an alternative embodiment of an insert 10 will be explained in more detail, via which the material of two extrusion machines is divided into a total of four extruded webs.

Also, the insert 10 includes a central channel 11 through which the leads (in this view below) are inserted and (in this view, top) and provided with a multi-colored jacket.

In contrast to the insert described above, the material of an extrusion machine is injected into the laterally arranged channel 25.

In the channel 25 is a splitter 16.

Via the channel 25, a part of the material of an extrusion machine exits on the same side through an outlet 17 arranged above it and is guided along the axially arranged channel 19 in the direction of the cable to be extruded.

In order to first safely separate the material after leaving the channel 17 from the material of the other extrusion machine and to guide it, this insert also comprises the dividers 18, which are formed as pointed serrations, thus leak in the direction of the cable to be extruded.

Fig. 7 FIG. 12 is a perspective view of the opposite side of the insert shown in FIG. 10. FIG.

It can be seen that there is also an outlet 20 on this side, according to the Fig. 6 the material of the extrusion machine entering the channel 25 (FIG. Fig. 6 ), exits. The outlet 20 is therefore with the in Fig. 6 shown channel 25 connected.

Thus, the material of an extrusion machine is divided into two opposing segments, which can occupy for example a quarter of the circumference of the cable sheath.

Also on this page dividers 18 are present, which initially separate the material.

On the here in Fig. 7 the second extrusion machine is shown connected, the material is divided in this embodiment, the splitter 21 and is guided over the side of the splitter 21 outgoing channels 22a and 22b in the direction of the cable to be extruded.

In this exemplary embodiment, therefore, the splitter 21 already serves to divide the material of the second extrusion machine into two partial streams. These two partial flows connect above the dividers 18 with the two partial streams from the other extrusion machine, which flow out of the outlets 17 and 20.

Fig. 8 shows the in Fig. 6 and Fig. 7 illustrated insert 10 in a plan view of the output of the channel 11, through which the line is guided.

It can be seen that the divider 18 divides the material of the two extrusion machines into a total of four paths.

To be able to guide the material of an extrusion machine to the opposite side, the insert 10 comprises an inner part 24, through which, in cooperation with the outer part of the insert 10, a channel can be formed, which connects the inlet of the channel 25 with the outlet 20.

By the invention could be designed as a rubber or plastic hose line cable be provided, which is visually appealing and whose visibility is improved in a simple manner.

LIST OF REFERENCE NUMBERS

1

electric wire

2

coat

3a

Area

3b

Area

4

Vein

5

insulation

6

investment

7

management

8a, 8b

extrusion machine

9

Umspritzwerkzeug

10

commitment

11

channel

12

splinter

13

island

14a, 14b

channel

15

divider

16

splinter

17

outlet

18

divider

19

channel

20

outlet

21

splinter

22a, 22b

channel

23

channel

24

inner part

25

channel

Claims (14)

Rubber hose or plastic hose, comprising at least three cores, each sheathed with an insulation, the cores sheathed with the insulation being arranged in an extruded jacket of rubber or plastic,
characterized in that the jacket comprises at least two regions in which the rubber or plastic is formed of a different color. Rubber or plastic hose line according to the preceding claim, characterized in that the rubber or plastic hose line is a type H05 or H07 RR, RN or VV cable. Rubber or plastic hose according to one of the preceding claims, characterized in that the wires each have a cross-section of 1 to 3 mm ² . Rubber or plastic hose according to one of the preceding claims, characterized in that the jacket consists of a rubber, in particular chloroprene rubber, a silicone rubber or PVC. Rubber or plastic hose line according to one of the preceding claims, characterized in that the jacket immediately adjacent to the insulation. Rubber or plastic hose according to one of the preceding claims, characterized in that the jacket is formed in a single layer. Rubber or plastic hose line according to one of the preceding claims, characterized in that the sheath comprises 10-90%, preferably 30 to 70% of a material of a first color and / or 10-90%, preferably 30 to 70% of a material of a second color , Rubber or plastic hose according to one of the preceding claims, characterized in that the jacket is formed striped. Rubber or plastic hose assembly according to the preceding claim, characterized in that the jacket comprises at least one strip of a first color, which is narrower than an adjacent region of the jacket. Extension pipe or cable drum, comprising a rubber or plastic hose line according to one of the preceding claims. A method of making a rubber or plastic tubing according to any one of the preceding claims, wherein the sheath is around the one with the insulation provided cored wires is extruded. Method according to the preceding claim, characterized in that the jacket is extruded by means of two extrusion machines, wherein in a Umspritzwerkzeug the rubber or plastic in webs, preferably in four tracks on the lines which are guided by the Umspritzwerkzeug applied. Method according to the preceding claim, characterized in that a Umspritzwerkzeug is used with at least two dividers, which divide the rubber or plastic in at least two tracks. Method according to one of the two preceding claims, characterized in that a Umspritzwerkzeug is used, which has a channel, is passed over the extruded rubber or plastic on an opposite side of the conduit.

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