DE7635852U1 - End grommet for cable ducts or the like - Google Patents

Description

PATENTALNWAITS: ": Λ Dipl. Ing. LUDEWIG - Dipl.-Phys. BUSE graduate phys. MENTZEL ^ _{ WUPPERTAL 2 UNDERDORNEN 114 RUF (0202) 553611/12 "'

36 Canons : "pipe end nozzle"

Hermann Kleinhuis _y 588o Lüdenscheid, An der Steinert 1

End grommet for cable ducts or the like.

The invention relates to an end grommet for protective cable pipes or the like. Which are clamped onto the pipe end consists of elastically resilient material and on her Has circumferential surface arranged elevations.

In the case of a known one designed as an outer or inner grommet The end grommet for cable protection pipes is turned towards the pipe surface Side provided with annular and successive elevations. These elevations are undercut on one side, so that seen in the longitudinal section of the end grommet this has a sawtooth-like surface. The Flat inclined, ring-shaped sections in the plug-on or plug-in direction the end cap. In order to securely clamp the end grommet to the protective cable pipe, the inside diameter of an outer grommet is required smaller than the outer diameter of the cable protection tube engaging in the end grommet while with an inner grommet the outer diameter of which is greater than the inner diameter of the tube that extends over the inner sleeve. Although the End sleeves made of an elastic material such as plastic, rubber Or the like. exist, compressions or elongations occur on the end grommet in the radial direction, which may lead to Tearing of the end cap. It is also known the

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7635852 2A.83.77

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End sleeves on the side facing away from the pipe surface To be reinforced by a thin-walled metal sleeve or the like. Aufier that this increases the manufacturing costs a metal jacket in the case of end sleeves is disadvantageous in that it tends to chafe through the insulating jacket of the cable and to inadvertently introduce electrical cables Electricity can get into the cable duct.

The object of the invention is to provide an end grommet for cable protection pipes that without the aid of a Support jacket widening or compressing its circumference with secure adhesion to the pipe jacket without essential Permits increase in tension in the sleeve jacket.

According to the invention, this object is achieved in that the elevations are formed like beads and are arranged one behind the other in the circumferential direction in such a way that a wave-shaped Ring cross-section of the end grommet of the same wall thickness is created. This allows the diameter of the sleeve jacket both in In the sense of an enlargement as well as a reduction in size, they can be deformed without causing significant increases in stress comes in a spout coat. The wave-shaped design of the ring cross-section of the end grommet allows compression or compression. Stretch the jacket in the circumferential direction without the formation of cracks in the sleeve jacket. By choosing a more or less elastic material for the production of the end grommet can be its adhesion to the cable protection tube also increase more or less. It is possible to achieve an adhesive force evenly distributed over the circumference of the protective cable tube, while the elevations are preferably designed to be identical to one another and in a symmetrical arrangement are distributed over the circumferential surface of the end grommet.

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ΠΗ0902 24.0177

t ill

In order to be able to attach the end grommet easily and without difficulty to the end of the cable protection tube According to a feature of the invention, the opening of the end grommet which is front in the pushing-on direction is funnel-shaped. With an outer spout it expands the funnel starting from the inside diameter of the end grommet outwards, while with an end grommet that can be inserted into the cable protection tube, its funnel-shaped End narrows radially inward.

This means that the insulating jacket of the cable comes into contact with the sharp edges of the end face of the cable protection tube is safely avoided, according to a further feature of the invention, the rear opening in the push-on direction has End nozzle on a collar with a hook-shaped cross-section * In the case of an end grommet attached to the outside of the protective cable pipe, the collar is drawn in radially inward, while in the case of an end grommet which can be inserted into the protective cable pipe, the collar extends radially outwards over the outer diameter the end grommet also extends. The collar of the end grommet that covers the end face of the protective cable pipe is at least as large as the wall thickness of the protective cable pipe. This reliably prevents the insulating jacket of the cable from coming into contact with the end faces of the protective cable pipe comes.

The invention is carried out using the example of an outer socket End grommet shown in the drawing and will be described in more detail below. Show it:

Fig. 1 the end tulle in a longitudinal section

2 shows the same end grommet in a cross section according to the line II-II of Figure 1,

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7635882

3 shows the end grommet in a view with the end grommet shown in dash-dotted lines Cable protection tube is pushed in together with a cable.

The end grommet 1o is sleeve-shaped and has elevations 12 on its circumferential surface 11, which are embodied like beading and whose longitudinal direction runs parallel to the longitudinal axis 1o. In the illustrated embodiment, the elevations 12 are evenly distributed over the circumference of the end grommet 1o and are arranged one behind the other in the circumferential direction thereof. This creates an undulating ring cross-section with the same wall thickness at the end sleeve. The elevations 12 of the illustrated end sleeve 1o have a trapezoidal contour both on the outer jacket and on the inner jacket of the end sleeve 1o, which results in the wave shape of the annular cross-section of the end sleeve 1o. In the edge area of the front opening 13 in the pushing-on direction, the wall parts 15 lying between the elevations 12 are widened outwards, so that the opening 13 is designed in a funnel-shaped manner for better attachment to the cable protection tube 16. The rear opening opposite the push-on opening 13 is provided with a collar 17 which has a hook-shaped cross section. This hook-shaped collar 17 is drawn in radially inward in the slip-on nozzle shown, namely that the end face 18 of the protective cable pipe 16 is covered by the collar 17 at least in the area of the wall thickness of the protective cable pipe. Since the collar 17 is drawn inwards in the shape of a hook, the exit edge 19 of the rear opening 14 to the contactor of the insulating jacket on the exiting cable can be rounded off. In order to safely avoid that the insulating jacket of the conductor comes into contact with the edges of the protective cable tube 16 at its end face 18, the diameter of the opening 14 is at least as large as the inner diameter of the protective cable tube or at most slightly smaller than the inner diameter of this protective cable tube

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7835852 24.S & 77

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As already mentioned, the figures only show one for example implementation of the invention and this is not limited thereto. Rather, other designs are also possible. For example, the wavy Cross-section of the end grommet 1o deviate from the trapezoidal contour and are sinusoidal, semicircular, zigzag-shaped Or the like. Be designed. An end grommet which can be inserted into the cable pipe 16, for example, is in contrast to the end grommet shown and described their front opening in the pushing-on direction have an inwardly inclined funnel shape. In addition, the Cable protection tube 16 insertable end grommet with. provided a collar which extends radially outward over the shaft the end grommet and have such an outer diameter that the outer diameter of the cable protection tube roughly corresponds to. Furthermore, it is conceivable not to arrange the bead-like elevations 12, as in the illustrated and previously described exemplary embodiment, axially parallel to the longitudinal axis of the end grommet, but rather these elevations 12 to give a course inclined to the longitudinal axis of the end sleeve 1o, so that the elevations 12 are arranged like the teeth of a helical toothing next to one another on the circumference. Besides that the elevations 12 could also only be arranged in areas on the circumference of the end grommet, because already such In some areas, wavy profiling of the ring cross-section of the end grommet allows the grommet jacket to expand in the circumferential direction. It is understood that the inner diameter of the relaxed, on the cable protection tube 16 attachable end grommet is slightly smaller than the outer diameter of the Cable protection tube, while the outer diameter of an end grommet which can be inserted into the cable protection tube 16 is slightly larger than the inside diameter of the cable duct

PATK NTAN WÄ4.T1 DiPL-INO. LUDEWIG ■ dipl.-phys.6USE dipl-phys.MENTZEL WUPPERTAL 2 UNDERDORNEN 114 RUF (02 02) 55 36 11/1

36

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Beguqtgelchenlls te t

10 endtulia

11 circumference area (12 increases

13 opening, front

14 opening, rear

15 wall part

16 cable duct

17 collar

18 face

19 trailing edge

Claims (6)

PATENT ANWÄiTfc DiPL-ING. LUDEWIG · DiPL-PHYS. BUSE · DiPL-PHYS. MENTZEL ^ WUPPERTAL 2 UNTERDlQfRNEN 114 RUF (0202) 553611/12 36 -6- claims t 1. End grommet for cable ducts or the like clamping attachment to the pipe end consists of elastically flexible material and has elevations arranged on its circumferential surface, thereby characterized in that the elevations (12) are slcken-like and are arranged one behind the other in the circumferential direction in such a way that a wave-shaped Ring cross-section of the end grommet (1o) with the same wall thickness is created. 2. End sleeve according to claim 1, characterized in that the elevations (12) are designed to be identical to one another and in a symmetrical arrangement over the circumferential surface (11) the end sleeve (1o) are distributed. 3. End grommet according to claim 1 or 2, characterized in that the front opening (13) of the end sleeve in the pushing-on direction (1o) is funnel-shaped. 4. End grommet according to one or more of the preceding claims, characterized in that the rear opening (14) of the end grommet (Io j a collar (17X having a hook-shaped cross-section. 7635852 24.1177 5. Endtulie according to claim 4, characterized in that the collar (17) on the outside of the cable protection tube (1o) The attached end grommet (1o) is drawn in radially inwards is, 6. End grommet according to claim 4, characterized in that the collar at the inside in the protective cable tube (16) inserted end grommet radially outwards over the outer diameter the end grommet extends.