Cable screw connection

Abstract

The invention proceeds from a cable screw connection, in particular for connecting a sheathed electrical conductor to a device housing, having a cable side and a housing side, consisting of at least one built-in threaded sleeve, at least one screw-in sleeve and at least one sealing element. The built-in threaded sleeve has at least one circumferential stop element facing outwards, a first outer thread, an inner thread and a holding form.

Description

[0001] Applicant: HARTING Electric Stiftung & Co. KG Title: Cable gland Description The invention is based on a cable gland according to the preamble of independent claim 1. Such cable glands are required to connect electrical conductors, in particular sheathed electrical cables, but also for fluid lines, for example compressed air hoses, to a housing wall and / or a device wall, for example a connector, a plug-in connector or a control cabinet, and to protect them against external influences. Cable glands can be used to protect against tensile loads. Alternatively or additionally, cable glands are used to protect against the ingress of foreign media, for example dust, dirt or fluids, in particular water, i.e. to seal against foreign media. State of the art DE 2631996 A1 shows a cable gland known from the prior art.The design of a cable gland shown and described in the application is still widely used in its essential form today and has been incrementally improved. A disadvantage of such cable glands is their comparatively large space requirement, which is particularly noticeable for cables with a large core cross-section and when used in tight spaces. Especially when using electrical cables with a core cross-section of 50 mm² or greater, installation is made more difficult by the increased bending radius required for the cable and by the cable gland protruding from the housing wall and / or device wall. In the aforementioned case of a cable with a core cross-section of 50 mm², the bending radius is therefore already around 40 mm in the best possible case. A prior art cable gland usually protrudes another 30 mm from the housing wall and / or device wall.In the example mentioned, a large portion of the required installation space is already defined by the cable gland. The German Patent and Trademark Office searched the following prior art in the priority application for the present application: DE 3640832 A1, DE 102007056478 A1, DE 102015003269 A1, DE 1827068 U, and US 3,055,972 A. Task The object of the invention is to offer a cable gland that places lower demands on the required external installation space and can be used simply and reversibly. This object is achieved by the subject matter of independent claim 1. Advantageous embodiments of the invention are specified in the subclaims and the following description.The invention relates to a cable gland, in particular for connecting a sheathed electrical conductor to a device housing, with a cable side and a housing side, consisting of at least one built-in threaded sleeve, at least one screw-in sleeve and at least one sealing element. The built-in threaded sleeve has at least one circumferential, outwardly facing stop element, a first external thread, an internal thread and a holding shape. The screw-in sleeve has at least a second external thread, wherein the second external thread engages with the internal thread and wherein by screwing the screw-in sleeve into the built-in threaded sleeve the seal is compressed such that a conductor introduced into the cable gland is at least substantially fixed by the circumferential pressure of the sealing element on the sheath of the electrical conductor.The described cable gland can therefore essentially be placed inside a housing connected to it, such as a device housing or a connection housing. In this way, space can be created outside the housing for laying a cable fed through the cable gland. Furthermore, at least one compression element is arranged between the screw-in sleeve and the sealing element. The compression element is designed to compress the sealing element in the desired manner when the screw-in sleeve is screwed in. The compression element is advantageously designed such that a seal dimensioned to match the wire cross-section is pressed against a cable sheath as desired. Finally, the compression element has a circumferential wedge shape which points towards the side of the housing.This wedge shape is particularly advantageous in that it is designed as an internally arranged chamfer, whereby the compression element rests against the inner area of ​​the built-in threaded sleeve and could remove the seal from it. In this way, the seal can initially be brought closer to the cable sheath, where it is then pressed onto the sheath by the inner diameter of the compression element and / or the screw-in sleeve. The compression element is arranged on the end of the screw-in sleeve, facing the housing side. This allows the compression element to be made from a second material which is different from the material of the screw-in sleeve. In this case, the compression element can be firmly bonded to the screw-in sleeve, for example using an adhesive. Alternatively, positive fastenings such as locking elements such as clips, pins or wedges can be provided.Finally, force-locking connections are also conceivable, for example by pressing or clamping. In one embodiment, the stop element is arranged on the end of the built-in threaded sleeve, facing the cable side. This arrangement ensures that the cable gland as a whole is inserted as far as possible into the interior of the device housing. As a result, the entire cable gland hardly protrudes from the corresponding device housing. Ideally, when installed, only a fastening form provided on the screw-in sleeve protrudes from the device housing. In a further embodiment, the stop element has a first key shape on its circumference and facing the cable side, into which a first wrench with a first wrench size can preferably be engaged.This allows the cable gland to be easily and advantageously inserted into a device housing by screwing it into it. The stop element ideally accommodates a seal, for example an O-ring, pointing towards the housing side in order to seal the interior of the device housing against foreign media such as dust and / or fluids. One useful embodiment proposes that the first external thread extends from the stop element towards the housing side. One valuable embodiment provides that the screw-in sleeve has a second key shape on its circumference and pointing towards the cable side, into which a second wrench with a second wrench size can preferably be engaged. Furthermore, one embodiment provides that the second key shape does not protrude beyond the outer diameter of the second external thread.This embodiment in particular enables the thread of the screw-in sleeve to be screwed in beyond the stop shape and / or the end of the built-in threaded sleeve pointing towards the cable side in the direction of the housing side. In a further developed embodiment, the holding shape is arranged behind the stop element and points towards the housing side. Very particularly preferably, the holding shape is arranged on the end of the built-in threaded sleeve and points towards the housing side. Furthermore, it is proposed that the holding shape has a phase or shape pointing towards the cable side and essentially tapering. The holding shape holds a sealing element in position by securing the sealing element at least towards the housing side. In a clever way, one embodiment provides that the holding shape has a groove running around the inside and pointing towards the housing side.In a clever way, the seal also has a circumferential spring which fits at least partially into the groove. This ensures that the seal cannot be removed via the holding element and secures a passed-through cable in the desired manner and at least partially seals it off against foreign media. In another embodiment, the compression element is not used as a separate component in the cable gland. Thus, the screw-in sleeve is designed with a compression element arranged thereon. Particularly preferred is a molded-on compression element which is made of the same material as the screw-in sleeve itself. Embodiment An embodiment of the invention is illustrated in the drawings and explained in more detail below. They show: Fig. 1 a side view of various cable glands in one housing wall each; Fig.2 shows a longitudinal section view of various cable glands, each in a housing wall; 3 shows a perspective view of a cable gland according to the invention; 4 shows a cable gland according to the invention in longitudinal section. Some of the figures contain simplified, schematic representations. Identical reference numerals are used for some of the same, but possibly not identical, elements. Different views of the same elements may be scaled differently. Directional indications such as “left”, “right”, “top”, and “bottom” are to be understood with reference to the respective figure and may vary in the individual representations compared to the object shown. Figure 1 shows two cable glands 1 and 101, wherein the cable gland 1 according to the invention is arranged above a cable gland 101 known from the prior art. The cable glands 1 and 101 are connected to a housing 10 and 110.It is clear that the cable gland 101 protrudes considerably further from the housing 110 than the cable gland 1 according to the invention does from the associated housing 10. The cable gland 1 according to the invention achieves this advantage through its inward-facing design projecting into the housing 10. The cable gland 1 has only a built-in threaded sleeve 2 and a screw-in sleeve 3 screwed to it, whereas known cable glands 101 protrude further from the housing 110 on the cable side K through an attachment threaded sleeve 102 which is provided with a union nut 103. The clever cable gland 1 is shown in Figure 2 in a sectional view in the housing 10 above a known cable gland 101 in the associated housing 110. The cable gland 1 has a built-in threaded sleeve 2 into which a screw-in sleeve 3 is inserted.A sealing element 4 is located within the built-in threaded sleeve 2, directed toward the housing side G. The sealing element 4 is positioned by a compression element 5 between an end of the built-in threaded sleeve 2 pointing toward the housing side G. A conventional cable gland 101, on the other hand, has a mounting threaded sleeve 102, which is fastened to the housing 110. A clamping element 105 is located within the mounting threaded sleeve 102, which projects out of the housing 110 toward the cable side K. A sealing element 104 is often positioned following the clamping element 105 toward the cable side K. Finally, a union nut 103 is screwed onto the mounting threaded sleeve 102, wherein the union nut 103 is partially spherical or conically tapered, directed toward the cable side K. In this way, when the union nut 103 is further screwed on, both the sealing element 104 and the clamping element 105 are pressed against the sheath of an inserted / passed-through cable.Figure 3 shows an isometric view of the cable gland 1 according to the invention, with some details being further illustrated. The built-in threaded sleeve 2 initially has a flange-like stop element 20. Furthermore, the built-in threaded sleeve 2 is provided with a first external thread 21. A first key shape 23 is formed along the circumference of the stop element 20. This first key shape 23 can be designed for open-end wrenches of known wrench widths. Alternatively, non-standardized wrench widths are also conceivable, which can prevent unwanted disassembly. Pointing towards the housing side G, the built-in threaded sleeve 2 terminates in a retaining shape 24. Cleverly, a concentric groove 25 is incorporated into the retaining shape 24. The screw-in sleeve 3 is inserted into the built-in threaded sleeve 2.In order to be able to screw the screw-in sleeve 3 into a housing 1 when the built-in threaded sleeve 2 is already fastened to it, the screw-in sleeve 3 has a second key shape 31. The screw-in sleeve 3 is followed on the housing side G by a compression element 5 which, in a simple embodiment, compresses the following sealing element 4 during a screwing process from the screw-in sleeve 3 into the built-in threaded sleeve 2 and thus presses the sealing element 4 onto the sheath of a cable. The operating principle of the embodiment shown is clear in Figure 4, a more detailed sectional view of the cable gland 1. The screw-in sleeve 3 can be screwed in through the internal thread 22 of the built-in threaded sleeve 2 through the corresponding second external thread 30. During the screw-in sleeve 3 is screwed into the built-in threaded sleeve 2, the compression element 5 is moved to the end of the built-in threaded sleeve 2, which faces towards the housing side G.More precisely, the compression element 5 is moved in the direction of the holding mold 24. Since the sealing element 4 is arranged between the holding mold 24 and the compression element 5, the latter is increasingly compressed. In order to introduce a further displacement effect in addition to the compression of the sealing element 4 by the compression element 5, it is proposed to arrange a circumferential wedge shape 50 on the compression element 5. The wedge shape 50 can be introduced as a separate component. In Figure 4, the wedge shape 50 has a slight radius. The wedge shape 50 sequentially displaces the sealing element 4 from the inside of the installation threaded sleeve 2. As soon as the sealing element 4 comes into contact with the sheath of a cable, compression can also occur here, thus achieving a seal against foreign media as well as useful strain relief for the cable.To prevent the sealing element 4 from detaching from the holding mold 24 due to excessive pressure from the compression element 5 and / or the screw-in sleeve 5, the sealing element 4 is additionally designed with a spring 40 that engages the groove 25 of the holding mold 24. Although various aspects or features of the invention are shown in combination in the figures, it will be apparent to those skilled in the art—unless otherwise stated—that the combinations illustrated and discussed are not the only possible ones. In particular, corresponding units or feature complexes from different exemplary embodiments can be interchanged.

[0002] Applicant: HARTING Electric Stiftung & Co. KG Title: Cable gland List of reference symbols 1 Cable gland 2 Installation threaded sleeve 2 0 Stop element 2 1 First external thread 2 2 Internal thread2 3 First key form 2 4 Halteform 25 Nut 3 screw-in sleeve 3 0 Second external thread 3 1 Second key shape 4 Sealing element 4 0 Feder 5 Compression element 5 0 Keilform 1 0 Device housing1 01 Cable gland1 02 Mounting thread sleeve1 03 union nut 104 Sealing element 105 clamping element 110 Device housing G Housing side K Cable side

Claims

Applicant: HARTING Electric Stiftung & Co. KG Title: Cable gland Claims 1. Cable gland (1), in particular for connecting a sheathed electrical conductor to a device housing (10), with a cable side (K) and a housing side (G), consisting of at least one built-in threaded sleeve (2), at least one screw-in sleeve (3) and at least one sealing element (4), wherein the built-in threaded sleeve (2) has at least one circumferential, outwardly facing stop element (20), a first external thread (21), an internal thread (22) and a holding form (24), wherein a screw-in sleeve (3) has at least a second external thread (30), wherein the second external thread (30) engages in the internal thread (22) and wherein by screwing the screw-in sleeve (3) into the built-in threaded sleeve (2), the sealing element (4) is compressed in such a way thatthat a conductor inserted into the cable gland (1) is at least substantially fixed by the circumferential pressure of the sealing element (4) on a sheath of the electrical conductor, and wherein at least one compression element (5) is arranged between the screw-in sleeve (3) and the sealing element (4), characterized in that the compression element (5) has a circumferential wedge shape (50) which points into the housing side (G), wherein the compression element (5) is arranged at the end of the screw-in sleeve (3) facing the housing side (G).

2. Cable gland (1) according to claim 1, characterized in that the stop element (20) is arranged at the end of the built-in threaded sleeve (2) facing the cable side (K).

3. Cable gland (1) according to one of the preceding claims, characterized in that the stop element (20) has a first key shape (23) on its circumference, into which a wrench with a first wrench width can preferably be inserted.

4. Cable gland (1) according to one of the preceding claims, characterized in that the first external thread (21) extends from the stop element (20) towards the housing side (G).

5. Cable gland (1) according to one of the preceding claims, characterized in that the screw-in sleeve (3) has a second key shape (31) on its circumference, into which a wrench with a second wrench width can preferably be inserted.

6. Cable gland (1) according to one of the preceding claims, characterized in that the second key shape (31) does not protrude beyond the outer diameter of the second external thread (30).Cable gland (1) according to one of the preceding claims, characterized in that the retaining shape (24) is arranged behind the stop element (20) facing the housing side (G).

8. Cable gland (1) according to one of the preceding claims, characterized in that the retaining shape (24) is arranged at the end of the built-in threaded sleeve (2) facing the housing side (G).

9. Cable gland (1) according to one of the preceding claims, characterized in that the holding shape (24) has a groove (25) facing into the housing side (G) and running circumferentially on the inside.

10. Cable gland (1) according to one of the preceding claims, characterized in that the sealing element (4) has a circumferential spring (40) which fits at least partially into the groove (25).

11. Cable gland (1) according to one of the preceding claims, characterized in that the compression element (5) is arranged in a materially bonded manner on the screw-in sleeve (3).

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