tightening nut

Abstract

This invention relates to a clamping nut (1) for cable glands, configured for specific assembly conditions. In this case, the clamping nut cannot be subsequently installed on a cable (60) with an integrated cable sleeve (70). According to the invention, the clamping nut (1) is formed in two parts by a base (10) and a ring (15). The two-piece clamping nut (1) allows the ring (15) to be positioned onto the cable (60) earlier during installation, behind the cable sleeve (70). This ensures the installation of the cable (60) with the cable sleeve (70) and the ring (15) and enables subsequent connection of the base (10) and the ring (15).

Description

Technical Field

[0001] This application relates to a compression nut. Background Technology

[0002] Cable glands require this type of clamping nut. Here, the cable guide passes through the feeder and / or sleeve, and the cable should be secured to the feeder and / or sleeve. Cable securing is often combined with simultaneous sealing of the cable. The clamping nut requires the use of sealing devices, clamps, or sleeves to fasten and / or seal the cable to the feeder, or to fasten and / or seal the cable at the feeder.

[0003] Compression nuts typically have a stepped or gradually tapering inner side, where clamping or sealing devices are clamped or compressed together. Here, the compression nut is screwed onto the base of the cable gland. The sealing device, sleeve, or clamping element positioned between the base and the compression nut is radially compressed inward. This compression forces the threaded cable into a tight, locking connection. This often achieves an environmentally sealed connection.

[0004] Numerous cable glands and clamping nuts for cable glands are known from existing technology. When installing a cable gland, the clamping nut is first pushed onto the cable, followed by the sealing device or clamping element, and then the gland body. The sealing device or clamping element is often already included in the body or integrally connected to it.

[0005] For specific applications, especially where environmental factors negatively impact cable glands, special measures are provided. For this purpose, sealing devices are often applied to the cable as an integral part of the overall system. This is achieved by injecting or bonding a so-called cable sleeve onto the cable during cable bundling. The cable sleeve serves a different function here. Firstly, it forms a sealing device. Thus, by injecting or bonding it to the cable, a particularly environmentally sealed connection is established.

[0006] On the other hand, it achieves better mechanical fastening of the cable within the cable gland. The cable sheath is also often implemented to be slightly longer and therefore also serves as an anti-bend structure for the cable. Especially in the area of ​​the cable gland, strong forces act on the cable and can potentially cause it to break quickly. This anti-bend structure prevents this.

[0007] In solutions for cable glands known from the prior art, the installation sequence is disadvantageous. Therefore, there exist assembly situations where the known installation sequence is impossible. This is especially true when the assembly is designed such that the cable, along with the gland and cable sleeve, must be guided through a narrow opening. However, because the clamping nut of the cable gland must be pushed onto the cable before the cable sleeve is injected, the cable gland no longer passes through an opening smaller than the clamping nut itself.

[0008] Solutions already exist in the prior art for this application scenario. One such solution is a clamping nut consisting of two half-nuts that can be retrofitted around the cable using a locking mechanism. However, a disadvantage of this clamping nut is its inability to withstand large mechanical forces. This has a negative impact primarily in areas with high environmental loads. While cable glands with such clamping nuts can be retrofitted, they do not meet the necessary requirements for mechanical load capacity and sealing. Summary of the Invention

[0009] The objective of this invention is to provide a clamping nut suitable for use in extremely narrow cable feeders. Here, the clamping nut must be able to withstand high mechanical loads. Simultaneously, the clamping nut must be able to pass through narrow openings and be installed even when cable sheaths or anti-bend structures are already installed on the cable.

[0010] This task is accomplished by tightening the nut as described below.

[0011] Advantageous designs of the present invention will be described below.

[0012] This invention relates to a clamping nut for a cable gland. The clamping nut is configured to utilize the base of the cable gland, which engages with the clamping nut, to act on a clamping or sealing element. Here, the clamping or sealing element is pressed between the clamping nut and the base, causing the clamping or sealing element to apply a radially inward oriented force. This radially inward oriented force of the clamping or sealing element is configured to mechanically fasten and / or seal the cable guiding through the cable gland.

[0013] The clamping nut generally has a round outer surface, although angular shapes are also possible. A through opening forms the inner surface. The inner surface is suitably constructed as a cylinder and has a first internal thread. The clamping nut can be screwed onto the base of a cable gland via the first internal thread. To do this, the base of the cable gland can be screwed into the first internal thread of the clamping nut on the screw-in side.

[0014] The clamping nut and the screw-in side form a guide side, which is designed to receive and guide the cable. The cable can be introduced into the clamping nut in the guide side and guided through the clamping nut until it reaches the screw-in side.

[0015] Appropriately, a first inner diameter is provided on the screw-in side of the clamping nut, which also forms the diameter of the first internal thread, wherein a second inner diameter is provided on the thread-through side of the clamping nut. Here, the second inner diameter is configured to be smaller than the first inner diameter.

[0016] In a preferred embodiment of the invention, a compression region is provided in the area between the first inner diameter and the second inner diameter. Instead of being constructed as a step between the first and second inner diameters, the compression region follows a tapered direction. That is, the inner surface of the clamping nut gradually tapers from the first inner diameter toward the second inner diameter in the compression region.

[0017] This preferred embodiment of the compression nut allows for particularly advantageous transfer of force to the clamping or sealing element arranged within it. The conical compression area advantageously applies radially inward-oriented force to the clamping or sealing element. The better this force is applied to the clamping or sealing element, the better the force-locking with the cable is achieved. Furthermore, this better influences the seal between the cable gland and the cable.

[0018] According to the invention, the clamping nut is a two-piece structure. Here, the clamping nut consists of a base and a ring. The ring can be inserted into the base such that the base at least regionally surrounds the ring. An inner surface is formed at the base, forming a first inner surface, and at the ring, forming a second inner surface. In a particularly preferred embodiment, the ring is completely contained within the base. The ring can also be inserted into the base on the threaded side.

[0019] To ensure a secure connection between the base and the ring, an external thread is formed at the ring, which is constructed around the ring. This external thread is designed for screwing into a second internal thread. The second internal thread is suitably formed in the base on the through-hole side of the clamping nut. Therefore, the ring can be screwed into the base of the clamping nut on the through-hole side.

[0020] Another implementation specifies replacing the external thread of the ring and the second internal thread of the base with another locking mechanism. Therefore, a bayonet connection is also possible. For this purpose, a ring with a locking protrusion and a base with a groove are provided. The connection can also be achieved by engaging the locking protrusion into the groove of the base when the base and ring rotate relative to each other simultaneously.

[0021] In a particular embodiment of the invention, the first internal thread and the second internal thread are configured as a single thread extending through the base. That is, the thread extends from the screw-in side as the first internal thread to the thread-through side as the second internal thread. In this embodiment, the first internal thread and the second internal thread preferably have the same size and pitch.

[0022] A preferred embodiment of the invention specifies that the first inner diameter of the clamping nut is arranged at the base and the second inner diameter is arranged at the ring. This particularly advantageous arrangement of the first and second inner diameters enables a particularly advantageous installation of the clamping nut on the cable. This allows the cable to be laid using the ring already arranged on the cable and installed in areas that are too narrow for the entire clamping nut.

[0023] Therefore, a cable with a loop can be guided through an opening only slightly larger than the loop itself. That is, the opening only needs to be slightly larger than the first inner diameter of the clamping nut. Thus, the cable can, for example, be provided with a cable sleeve, which serves as both a clamp and a seal. The loop is held on the cable by the cable sleeve after being pre-installed onto it. Both the loop and the cable sleeve correspond to, at most, the first inner diameter of the clamping nut. The cable can be laid and / or moved through the opening, which provides only slightly more space than the first inner diameter, using the loop and cable sleeve disposed thereon.

[0024] After installing the cable sleeve and ring onto the cable, a base with a clamping nut larger than the first inner diameter can be pushed onto the cable and cable sleeve. Behind the cable sleeve, the clamping nut is screwed into the base via the ring, thus securing it to the cable behind the cable sleeve. Tightening of the clamping nut to the cable gland's mating joint is therefore possible, wherein the cable sleeve is simultaneously secured and held between the mating joint and the clamping nut.

[0025] To facilitate the tightening of the clamping nut onto the cable gland connector, at least one operating area is provided on the outer surface of the clamping nut. Preferably, the clamping nut has two, four, or six operating areas on its outer side. These operating areas are designed for manipulating the clamping nut with a tool, such as a fork wrench or pliers. The shape-locking grip and manipulation of the clamping nut are achieved through the regularly distributed operating areas around its perimeter. Therefore, force, preferably torque, can be transmitted to the clamping nut, securing it to or releasing it from the cable gland connector.

[0026] Another preferred embodiment specifies that at least one second operating area is provided at the ring that can be screwed into the base of the compression nut. This second operating area at the ring is used to apply force, preferably torque, to the ring and thus screw the ring into the base of the compression nut. The second operating area can here be configured as a notch for using a screwdriver, a face for using a fork wrench or, for example, an Allen wrench, or configured on another type of operating area known to those skilled in the art from the prior art. Attached Figure Description

[0027] Embodiments of the present invention are shown in the accompanying drawings and are explained in detail below. In the drawings:

[0028] Figure 1a This is a perspective view of the clamping nut according to the present invention;

[0029] Figure 1b This is a cross-sectional view of the clamping nut according to the present invention;

[0030] Figure 2a This is another perspective view of the clamping nut according to the present invention;

[0031] Figure 2b This is another cross-sectional view of the clamping nut according to the present invention;

[0032] Figure 3 This is a cross-sectional view of the clamping nut according to the invention on the mating part of the cable gland;

[0033] Figure 4 This is a cross-sectional view of a clamping nut, known in the prior art, on the mating part of a cable gland;

[0034] Figure 5 This is a cross-sectional view of the clamping nut according to the present invention, which is installed together with the cable, cable sleeve and cable gland connector;

[0035] Figure 6a This describes the three-dimensional assembly state of the clamping nut according to the present invention; and

[0036] Figure 6b The cross-sectional view shows Figure 6a The assembly status. Detailed Implementation

[0037] Figure 1a A perspective view of a clamping nut 1 according to the invention is shown. The clamping nut 1 is constructed in annular shape and has an inner surface 20 and an outer surface 30. The inner surface 20 in the clamping nut 1 can be accessed from the screw-in side 11 (located on the back side in the figure) and the threading side 12. Figure 1a The view allows the inner surface 20 of the clamping nut 1 to be seen through the through side 12.

[0038] Six first operating areas 35 are arranged on the outer surface 30 of the clamping nut 1, distributed around its periphery. The operating areas 35 are provided on the clamping nut 1 so that force can be applied to the clamping nut 1 using a fork wrench, a ring wrench, or pliers. The force acting on the clamping nut 1 as torque is used to tighten or loosen the clamping nut 1 onto or from the cable gland connector.

[0039] Depend on Figure 1a Known clamping nut 1 in Figure 1b The figure is shown in cross-sectional view. On the screw-in side 11 shown on the left, the clamping nut 1 has a first inner diameter 21 at its inner surface 20. The clamping nut 1 has a second inner diameter 22 on the through side 12 opposite to the screw-in side 11. The second inner diameter 22 is smaller than the first inner diameter 21.

[0040] In the region where the first inner diameter 21 transitions to the second inner diameter 22, the inner surface 20 forms an extrusion region 25. This extrusion region gradually tapers. That is to say, the first inner diameter 21 forms the widest diameter of the tapered extrusion region 25, while the second inner diameter 22 forms the narrowest diameter of the tapered extrusion region 25.

[0041] A first internal thread 23 is formed in the area shown on the left side of the inner surface 20. The free inner diameter of the first internal thread 23 forms a first inner diameter 21. The first internal thread 23 is open toward the screw-in side 11 of the clamping nut 1. Therefore, the cable gland connector can be brought into the clamping nut 1 through the screw-in side 11. Here, the external thread provided at the connector engages with the first internal thread 23 of the clamping nut 1, allowing the clamping nut 1 to be tightened on the connector.

[0042] exist Figure 2a The diagram shows the clamping nut 1 and in Figure 1a Another stereoscopic image from the same perspective. However Figure 2a The clamping nut 1 is shown in the exploded view, and the parts of the clamping nut 1 are shown separately. Here, in Figure 2a The left side shows the base 10 and the right side shows the ring 15. The ring 15 has external threads 16 on its outer surface. The external threads 16 allow the ring 15 to be screwed into the base 10. The base 10 and the ring 15 together form the clamping nut 1.

[0043] exist Figure 2b It shows Figure 2aThe diagram shows a cross-sectional view of a clamping nut 1 with a separate base 10 and ring 15. As shown, the inner surface 20 extends both through the base 10 (in which the inner surface forms a first inner surface 20a) and through the ring 15 (in which the inner surface forms a second inner surface 20b). The inner surface 20a in the base 10 is formed by a first internal thread 23 and a second internal thread 24. The second internal thread 24 is formed into the base 10 in the region of the thread-through side 12. In this particular embodiment, the first internal thread 23 and the second internal thread 24 are constructed identically. The first internal thread 23 and the second internal thread 24 thus transition into each other. It is also conceivable that in this embodiment, the first internal thread 23 and the second internal thread 24 have different specifications, pitches, or sizes.

[0044] In the illustrated embodiment, the compression region 25 of the clamping nut 1 is suitably disposed on the second inner surface 20b constructed at the ring 15. The compression region 25 is here disposed as a chamfer on the inner side of the ring 15. When the ring 15 is screwed into the base 10, the chamfer correspondingly forms a tapered compression region 25 that connects the first inner diameter 21 to the smaller second inner diameter 22, as shown in... Figure 1b As shown in the diagram.

[0045] Figure 1a The clamping nut 1 of / b and the connector 50 of the cable gland are together in Figure 3 The image is shown in cross-sectional view. The clamping nut 1 is shown in the right region, while the mating member 50 extends into the screw-in side 11 of the clamping nut 1 in the left region. The mating member 50 is suitably formed with external threads that engage with the first internal thread 23 of the clamping nut 1.

[0046] As is known in the prior art, the mating part 50 has a flange and a second thread in addition to the external thread for tightening the clamping nut 1. The second thread, shown here on the left side of the flange, allows the mating part to be received in a through hole in the mounting surface and secured thereto. Depending on the application, the mounting surface can be a plug connector housing, equipment wall, motor, or other machine. Applications where cables must be mechanically and securely connected to the mounting surface are well conceivable and known.

[0047] exist Figure 3The area between the compression region 25 on the inner surface 20 and the mating member 50 is also clearly visible. This gap between the clamping nut 1 and the mating member 50 is provided to accommodate a seal. The seal is clamped and compressed between the end side of the mating member 50 and the compression region 25, causing the seal to exert a radially inward oriented force due to elastic deformation. The cable housed in the seal can thus be mechanically and environmentally sealed. The force required for clamping between the clamping nut 1 and the mating member 50 is generated by the engagement of the first internal thread 23 of the clamping nut and the external thread of the mating member 50.

[0048] exist Figure 4 Compared to the clamping nut 1 according to the invention, a clamping nut 100 with a mating member 50, known in the prior art, is shown. It can be seen that the clamping nut 100 is constructed as a single piece. The compression region 250 is an integral component of the single-piece clamping nut. The feed member (through which the clamping nut 100 can be guided) must therefore correspond to or be larger than the external dimensions of the clamping nut 100. Conversely, in the clamping nut 1 according to the invention, the ring 15 can be separated from the base 10, so the feed member can also correspond to the first inner diameter 21.

[0049] Figure 5 Another cross-sectional view shows the complete assembly of the clamping nut 1 according to the invention, including the mating part 50, the cable 60, and the cable sleeve 70. The cable 60 is guided through the clamping nut 1. That is, the cable 60 is introduced into the clamping nut 1 on the insertion side 12 and extends out of the clamping nut on the screw-in side 11.

[0050] Cable sheath 70 is arranged around cable 60. Cable sheath 70 can be pushed onto cable 60 as a separate part. However, as those skilled in the art know, cable sheath 70 can also be injected onto cable 60 by, for example, a second injection process and thus connected to the cable. This is not of further importance to the invention.

[0051] The cable sleeve 70 has a seal 75, which forms an integral part of the cable sleeve 70 as a thickened structure. The seal 75 completely surrounds the cable sleeve 70. As is known in the prior art, the seal 75 is configured to clamp between the clamping nut 1 and the mating member 50. Through the tapered compression area 25 of the inner surface 20, force is transmitted not only to the mating member 50 but also to the seal 75 in a radially inward direction. The resiliently constructed seal 75 is preferably made of plastic or rubber. This achieves the transmission of radial force to the cable 60 and simultaneously provides an environmentally sealed connection between the cable and the cable gland.

[0052] According to the assembly status of the task of the present invention Figure 6a and6b This is illustrated once again by example. Here, Figure 6a A stereoscopic view is shown. Figure 6b A cross-sectional view is shown. Taking a perforation 85 at the housing wall 80 as a starting point, the perforation 85 is sized such that the clamping nut 1 cannot be guided through it. Due to production limitations, a cable 60 with a pre-injected cable sleeve 70 securely connected to the cable 60 is provided. Because the cable sleeve 70 is already present on the cable 60, the clamping nut 100, as known in the prior art, can no longer be guided onto the cable 60. Therefore, the seal 75 of the cable sleeve 70 is excessively thick.

[0053] According to the invention, the ring 15 is already arranged on the cable 60 before the cable sleeve 70 is applied. When installing the cable 60 through the through-hole 85, the cable 60, the cable sleeve 70, and the ring 15 can be guided through the through-hole 85. Here, the components are guided through the through-hole 85 of the housing wall 80 from the right side shown.

[0054] The base 10 and the connector 50 can be subsequently placed on the cable 60 and connected to the ring 15. The entire cable gland, consisting of the cable 60, cable sleeve 70, clamping nut 1 and connector 50, can be secured in the perforation at the mounting surface in another step.

[0055] List of reference numerals

[0056] 1 / 100 compression nut

[0057] 10 Matrix

[0058] 11. Tighten into the side

[0059] 12. Penetration side

[0060] 15 rings

[0061] 16 External Thread

[0062] 20 Inner surface

[0063] 20a First Inner Surface

[0064] 20b Second Inner Surface

[0065] 21 First inner diameter

[0066] 22 Second inner diameter

[0067] 23 First internal thread

[0068] 24 Second internal thread

[0069] 25 / 250 extrusion zone

[0070] 30 Outer surface

[0071] 35 First Control Area 40

[0073] 50 docking parts

[0074] 60 cable

[0075] 70 Cable conduit

[0076] 75 Seals

[0077] 80 Shell wall

[0078] 85 perforations

[0079] 100 compression nuts

Claims

1. Compression nut (1) having an inner surface (20) and an outer surface (30) and a screwing-in side (11) and a threading-through side (12), wherein The inner surface (20) has a first inner diameter (21) on the screw-in side (11) and is provided with a first inner thread (23), wherein the free inner diameter of the first inner thread (23) forms the first inner diameter (21), wherein the inner surface (20) has a second inner diameter (22) on the lead-through side (12), wherein the second inner diameter (22) is smaller than the first inner diameter (21), wherein the compression nut (1) is composed of two parts, wherein the two-part compression nut (1) consists of a base body (10) and a ring (15), wherein the inner surface (20) tapers conically between the first inner diameter (21) and the second inner diameter (22) in a compression region (25) such that the first inner diameter (21) forms the widest diameter of the compression region (25) and the second inner diameter (22) forms the narrowest diameter of the compression region (25), characterized in that the ring (15) has an outer thread (16) by means of which the ring (15) can be screwed into the base body (10).

2. Compression nut (1) according to claim 1, characterized in that the ring (15) can be inserted into the base body (10) of the compression nut (1) and the base body (10) at least regionally surrounds the ring (15), wherein the inner surface (20) forms a first inner surface (20a) at the base body (10) and a second inner surface (20b) at the ring (15).

3. Compression nut (1) according to claim 1, characterized in that the base body (10) has a second inner thread (24) arranged on the lead-through side (12), wherein the outer thread (16) can be screwed into the second inner thread (24).

4. Compression nut (1) according to claim 3, characterized in that the second inner thread (24) and the first inner thread (23) transition into one another.

5. Compression nut (1) according to claim 1, characterized in that the first inner diameter (21) is arranged at the base body (10) and the second inner diameter (22) is arranged at the ring (15).

6. Compression nut (1) according to claim 1, characterized in that at least one first handling region (35) is provided at the outer surface (30), which is configured for positively locking gripping and turning of the compression nut (1).

7. Compression nut (1) according to one of claims 1 to 6, characterized in that at least one second handling region is provided at the ring (15), which is configured for positively locking turning of the ring (15).

Images