Cable spiral connecting piece

Abstract

The invention relates to a cable screw, in particular for connecting a sheathed electrical conductor to a device housing, comprising a cable side and a housing side, said cable screw consisting of at least one insert threaded sleeve, at least one screw-in sleeve and at least one sealing element. Here, the insert threaded sleeve has at least one circumferential, outwardly directed stop element, a first external thread, an internal thread and a retaining shape.

Description

Technical Field

[0001] The present invention is based on a cable spiral connector of the type according to independent claim 1.

[0002] Such cable spiral connectors are necessary to connect electrical conductors, especially sheathed cables, but also to fluid lines, such as compressed air hoses, to housing walls and / or equipment walls, such as connectors, plug-in connectors, or switch cabinets, and to protect them from external influences. Cable spiral connectors can be used here to protect against tensile loads. Alternatively or additionally, cable spiral connectors are used to protect against the intrusion of external media, such as dust, dirt, or fluids, especially water; that is, to provide a seal against external media. Background Technology

[0003] DE 26 31 996 A1 illustrates a cable spiral connector known in the prior art. The construction of the cable spiral connector shown and described in this application is still being expanded in its basic form and has been progressively improved.

[0004] The disadvantage of this type of cable spiral connector is its relatively large space requirement, which is particularly noticeable in cables with large core cross-sections and in applications within confined structural spaces. This is especially true when using cables with core cross-sections greater than or equal to 50mm². 2 When assembling cables, the process becomes difficult initially due to the increased bending radius required for the cables and the spiral connectors extending from the housing wall and / or equipment wall. Therefore, in the case of the aforementioned 50mm... 2 In the case of cables with a core wire cross-section, the bending radius is already approximately 40mm under ideal conditions. Existing cable spiral connectors typically extend another 30mm from the housing wall and / or equipment wall. Therefore, in the example mentioned, most of the required structural space is already pre-defined by the cable spiral connector.

[0005] The German Patent and Trademark Office found the following prior art in the priority applications of this application: DE 36 40 832A1, DE 10 2007 056 478 A1, DE 10 2015 003 269 A1, DE 18 27 068 U and US 3,055,972A. Summary of the Invention

[0006] The purpose of this invention is to provide a cable spiral connector that requires less external structural space and can be used simply and reversibly.

[0007] This objective is achieved by the subject matter of independent claim 1.

[0008] Advantageous designs of the invention are given in the dependent claims and hereinafter.

[0009] The invention is based on a cable screw connector, in particular for connecting an electrical conductor with a sheath to an equipment housing, the cable screw connector having a cable side and a housing side, the cable screw connector being composed of at least one inserted threaded sleeve, at least one screwed-in sleeve and at least one sealing element. Here, the inserted threaded sleeve has at least one circumferential, outwardly directed stop element, a first external thread, an internal thread and a shape-retaining feature. The screwed-in sleeve has at least one second external thread, where the second external thread engages into the internal thread, and where by screwing the screwed-in sleeve into the inserted threaded sleeve, the seal is compressed such that the conductor introduced into the cable screw connector is at least substantially fixed by the pressure of the seal on the circumferential side of the sheath of the electrical conductor. The described cable screw connector can thus be introduced substantially into the interior of the housing to which it is connected, such as an equipment housing or a connection housing. In this way, space for laying the cable guided through the cable screw connector can be realized outside the housing. Furthermore, at least one compression element is provided between the screwed-in sleeve and the sealing element. The compression element is designed to compress the sealing element in a desired manner during the screwing-in process of the screwed-in sleeve. Here, advantageously, the compression element is designed such that the seal sized to match the cross-section of the core wire is pressed against the sheath of the cable as desired. Finally, the compression element has a circumferential wedge shape that points in the direction of the housing side. Here, the wedge shape is particularly advantageously implemented as an internal chamfer, whereby the compression element abuts against the internal region of the inserted threaded sleeve and can move the seal away from the inserted threaded sleeve. In this way, first the seal can be brought closer to the sheath of the cable, where it is then pressed onto the sheath by the compression element and / or the inner diameter of the screwed-in sleeve. Here, the compression element is arranged at the end side of the screwed-in sleeve pointing towards the housing side. Thereby, the compression element can be made of a second material different from the material of the screwed-in sleeve. In this case, the compression element can be connected to the screwed-in sleeve in a material-locking manner, for example by means of an adhesive. Alternatively, form-fitting fastening elements can be provided, such as latching elements like clips, pins or wedges. Finally, force-fitting connections are also conceivable, for example by pressing or clamping.

[0010] In one embodiment, the stop element is arranged at the end side of the inserted threaded sleeve pointing towards the cable side. By this arrangement, it is ensured that the cable screw connector as a whole is introduced as far as possible into the interior of the equipment housing on the one hand. This results in that the entire cable screw connector hardly protrudes from the corresponding equipment housing. Ideally, in the installed state, only the fastening shape provided at the screwed-in sleeve protrudes from the equipment housing.

[0011] In another embodiment, the stop element has a first wrench shape on the circumferential side and in the direction pointing towards the cable. Preferably, a first screw-on wrench with a first wrench width can engage in the first wrench shape. Thus, the cable spiral connector can be easily and advantageously introduced into the device housing, where it is screwed in. The stop element ideally has a seal, such as an O-ring, in the direction pointing towards the housing to seal the interior of the device housing relative to external media, such as dust and / or fluids.

[0012] One meaningful implementation proposes that the first external thread extends from the stop element toward the housing side.

[0013] One valuable implementation proposes that the sleeve has a second wrench shape on the circumferential side and in the direction pointing towards the cable side, preferably, a second wrench having a second wrench width can be engaged into the second wrench shape.

[0014] Furthermore, according to one embodiment, the second wrench shape does not extend beyond the outer diameter of the second external thread. This embodiment particularly enables screwing into the sleeve where the thread extends beyond the stop shape of the embedded threaded sleeve and / or where the end pointing towards the cable side faces the housing side.

[0015] In a further improved embodiment, the retaining shape is positioned facing the housing side behind the stop element. More particularly preferred is that the retaining shape is positioned facing the housing side at the end of the threaded sleeve. Furthermore, it is proposed that the retaining shape has a direction pointing towards the cable side and a substantially tapered phase or shape. By securing the sealing element at least towards the housing side, the retaining shape holds the sealing element in place.

[0016] One embodiment is cleverly proposed, where the retaining element has a groove that points towards the housing side and surrounds the inside. In a clever manner, the seal also has a surrounding elastic portion that at least partially engages with the groove. This ensures that the seal will not be removed beyond the retaining element and that the seal securely fastens the threaded cable in a desired manner and at least partially seals it against the external medium.

[0017] In another embodiment, the compression element is not inserted as a separate component into the cable screw connector. Instead, the screw-in sleeve is implemented together with the compression element located therein. A molded compression element, made of the same material as the screw-in sleeve itself, is particularly preferred here. Attached Figure Description

[0018] Embodiments of the present invention are shown in the accompanying drawings and are described in detail below. The drawings show:

[0019] Figure 1 A side view is shown of different cable spiral connectors in each of the housing walls;

[0020] Figure 2 A longitudinal sectional view showing different cable spiral connectors in each of the housing walls;

[0021] Figure 3 A perspective view of the cable spiral connector according to the present invention is shown;

[0022] Figure 4 The cable spiral connector according to the invention is shown in longitudinal section. Detailed Implementation

[0023] The accompanying drawings contain some simplified, schematic illustrations. Partially, the same reference numerals are used for the same, but not necessarily different, elements. Different views of the same element may be scaled differently. Directional descriptions, such as "left," "right," "up," and "down," are to be understood with reference to the corresponding drawings and may change relative to the objects shown in the various illustrations.

[0024] Figure 1 Two cable spiral connectors 1 and 101 are shown, wherein the cable spiral connector 1 according to the invention is positioned above the cable spiral connector 101 known in the prior art. Here, cable spiral connectors 1 and 101 are connected to housings 10 and 110. It is clear that cable spiral connector 101 extends significantly further from housing 110 compared to cable spiral connector 1 according to the invention extending from its respective housing 10. The cable spiral connector 1 according to the invention achieves this advantage through an inwardly pointing structure extending into housing 10. Here, cable spiral connector 1 only has an embedded threaded sleeve 2 and a screw-in sleeve 3 threaded thereto, while the known cable spiral connector 101 extends further from housing 110 towards the cable side, passing through a threaded sleeve 102 provided with a locking nut 103.

[0025] The ingenious cable spiral connector 1 Figure 2A cross-sectional view is shown in the housing 10 above the known cable spiral connector 101, which is located within its housing 110. Here, the cable spiral connector 1 has an embedded threaded sleeve 2, into which a screw-in sleeve 3 is introduced. Within the embedded threaded sleeve 2, a sealing element 4 is provided facing the housing side G. The sealing element 4 is provided by a compression element 5 between the ends of the embedded threaded sleeve 2 facing the housing side G. In contrast, the already well-known cable spiral connector 101 has a fitted threaded sleeve 102 fastened to the housing 110. A clamping element 105 is provided within the fitted threaded sleeve 102, extending from the housing 110 towards the cable side K. Following the clamping element 105 towards the cable side K, a sealing element 104 is typically provided. Finally, a locking nut 103 is screwed onto the fitted threaded sleeve 102, wherein the portion of the locking nut 103 facing the cable side K is spherically or taperedly tapered. In this manner, when the locking nut 103 is further tightened, not only the sealing element 104 but also the clamping element 105 is pressed against the sheath of the introduced / threaded cable.

[0026] Figure 3 An isometric view of the cable spiral connector 1 according to the invention is shown, in which some details are further clearly shown. The threaded sleeve 2 firstly has a flange-shaped stop element 20. Furthermore, the threaded sleeve 2 is provided with a first external thread 21. A first wrench shape 23 is formed along the circumference of the stop element 20. The first wrench shape 23 can be implemented for open-end wrenches of known wrench widths. Alternatively, non-standardized wrench widths are also conceivable, which can prevent undesirable disassembly. The threaded sleeve 2 is closed in a retaining shape 24 in the direction of the housing side G. Concentric grooves 25 are cleverly introduced into the retaining shape 24. A screw-in sleeve 3 is present in such a way that it is introduced into the threaded sleeve 2. In order to be tightened to the threaded sleeve 2, which is already secured in the housing 1, the screw-in sleeve 3 has a second wrench shape 31. A compression element 5 follows the screw-in sleeve 3 to the housing side G. The compression element compresses the sealing element 4 following it in a simple manner during the tightening process of the screw-in sleeve 3 into the threaded sleeve 2, thereby squeezing the sealing element 4 onto the cable sheath.

[0027] The working principle of the implementation shown is as follows: Figure 4A more detailed cross-sectional view of the cable spiral connector 1 becomes clear. The insert sleeve 3 can be screwed in via the corresponding second external thread 30 through the internal thread 22 of the insert threaded sleeve 2. During the screwing-in process of the insert sleeve 3 into the insert threaded sleeve 2, the compression element 5 is positioned at the end of the insert threaded sleeve 2 pointing towards the housing side G. More precisely, the compression element 5 moves towards the retaining shape 24. Because a sealing element 4 is provided between the retaining shape 24 and the compression element 5, the sealing element is gradually compressed. To introduce a dislodgement effect through the compression of the sealing element 4 by the compression element 5, a surrounding wedge shape 50 is proposed for the compression element 5. Here, the wedge shape 50 can be introduced as a separate component. Figure 4 In this context, the wedge shape 50 has a small radius. Through the wedge shape 50, the sealing element 4 is gradually squeezed away from the inside of the threaded sleeve 2. Once the sealing element 4 now contacts the cable sheath, compression can also be performed there, achieving both a seal relative to the external medium and a useful unloading of the cable's tension. To prevent the sealing element 4 from dislodging from the retaining shape 24 under excessive pressure from the compression element 5 and / or the screw-in sleeve 5, the sealing element 4 is additionally provided with an elastic portion 40 that engages in the groove 25 of the retaining shape 24.

[0028] Even though different aspects or features of the invention are shown in combination in the accompanying drawings, it will be apparent to those skilled in the art, unless otherwise stated, that the illustrated and discussed combinations are not the only feasible ones. In particular, corresponding sets of units or features in different embodiments can be interchanged with each other.

[0029] List of reference numerals

[0030] 1 Cable spiral connector

[0031] 2. Embedded threaded sleeve

[0032] 20 Stopping elements

[0033] 21 First external thread

[0034] 22 Internal Thread

[0035] 23 First wrench shape

[0036] 24. Maintain shape

[0037] 25 slots

[0038] 3. Screw in the sleeve

[0039] 30 Second external thread

[0040] 31. Shape of the second wrench

[0041] 4. Sealing elements

[0042] 40 Elastic part

[0043] 5. Compression element

[0044] 50 wedge shape

[0045] 10 Equipment housing

[0046] 101 Cable Spiral Connector

[0047] 102. Install a threaded sleeve.

[0048] 103 Locking Nut

[0049] 104 Sealing element

[0050] 105 Clamping element

[0051] 110 Equipment casing

[0052] G. Shell side

[0053] K cable side

Claims

1. A cable spiral connector (1), particularly for connecting a sheathed electrical conductor to a device housing (10), the cable spiral connector having a cable side (K) and a housing side (G), the cable spiral connector comprising at least one embedded threaded sleeve (2), at least one screw-in sleeve (3) and at least one sealing element (4), wherein the embedded threaded sleeve (2) has at least one circumferential, outwardly pointing stop element (20), a first external thread (21), an internal thread (22) and a retaining shape (24), wherein the screw-in sleeve... The sleeve (3) has at least one second external thread (30) which engages with the internal thread (22), and wherein the sealing element (4) is compressed by screwing the insert sleeve (3) into the embedded threaded sleeve (2), such that the conductor introduced in the cable spiral connector (1) is at least substantially fixed by the pressure of the sealing element (4) on the circumferential side of the sheath of the electrical conductor, and wherein at least one compression element (5) is provided between the insert sleeve (3) and the sealing element (4). Its features are, The compression element (5) has a surrounding wedge shape (50) pointing towards the housing side (G), wherein the compression element (5) is disposed at the end side of the screw-in sleeve (3) pointing towards the housing side (G).

2. The cable spiral connector (1) according to claim 1. Its features are, The stop element (20) is positioned at the end of the embedded threaded sleeve (2) with its direction toward the cable side (K).

3. The cable spiral connector (1) according to any one of the preceding claims. Its features are, The stop element (20) has a first wrench shape (23) on the circumferential side. Preferably, a screw wrench with a first wrench width can be inserted into the first wrench shape.

4. The cable spiral connector (1) according to any one of the preceding claims. Its features are, The first external thread (21) extends from the stop element (20) toward the housing side (G).

5. The cable spiral connector (1) according to any one of the preceding claims. Its features are, The screw-in sleeve (3) has a second wrench shape (31) on the circumferential side. Preferably, a screw-in wrench with a second wrench width can be inserted into the second wrench shape.

6. The cable spiral connector (1) according to any one of the preceding claims. Its features are, The second wrench shape (31) does not extend beyond the outer diameter of the second external thread (30).

7. The cable spiral connector (1) according to any one of the preceding claims. Its features are, The retaining shape (24) is positioned behind the stop element (20) pointing toward the housing side (G).

8. The cable spiral connector (1) according to any one of the preceding claims. Its features are, The retaining shape (24) is positioned at the end of the embedded threaded sleeve (2) pointing toward the housing side (G).

9. The cable spiral connector (1) according to any one of the preceding claims. Its features are, The retaining shape (24) has a groove (25) that surrounds the inside of the housing side (G).

10. The cable spiral connector (1) according to any one of the preceding claims. Its features are, The sealing element (4) has a surrounding elastic portion (40) that engages at least partially with the groove (25).

11. The cable spiral connector (1) according to any one of the preceding claims. Its features are, The compression element (5) is materially fitted at the screw-in sleeve (3).

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