Technical Field

The invention relates to accessories that are used in electrical equipments.

The invention particularly relates to seals used in cable glands that allow electrical cables to be connected to electrical equipment.

Prior Art

Nowadays there are many types of electrical equipments that have different points of cable input and output. The connection points of electrical equipments and cable input/output ports are expected to meet many criteria. One of these criteria is to provide sealing by preventing the entry of elements which may damage the equipment such as dust, water, etc. from the connection points. The elements such as dust, water, etc. that will enter into the electrical equipments can cause negative effects such as the decrease of the efficiency of the electrical circuits, the corrosion of the metal material, fire and explosion etc. Another important criterion is that the connections between electrical equipments and cables are resistant to impacts. In order to enable the connection points to meet the desired criteria, cable glands are particularly preferred in known applications.

The cable glands provide the sealing feature through seals. The cables suitable for the hole diameter are passed through the holes on the seal and then it is tightened. In this way, sealing is provided. In known applications, the seals can be single-hole or multi hole. Only one cable is passed through single-hole seals. In multi-hole seals, the number of cables to be passed depends on the number of holes on the seal.

Documents numbered as GB1507027, DE10356386, W020061 14587 discloses seals with multiple holes. The seals described in the above-mentioned documents have holes that extend axially. Such holes are usually cylindrical linear structures.

Each hole of the multi-hole seals with cylindrically structured holes tightens a single cable diameter. Said multi-hole seals do not have a tightening range. If the end user wants to tighten a different cable diameter, he/she must use the appropriate seal for that diameter. When it is desired to tighten a cable having a diameter smaller than the hole diameter of the multi-hole seal, the seal can not meet the desired sealing and impact resistance characteristics.

Commercially available electrical cables are mostly terminated with connectors or alike structures. The other ends of the cables, which are terminated by a different structure, must be free to be placed into the multi-hole seals. However, in the application process, the cables do not always have free end, or the free end is not easy and practical to find during assembly. This issue limits the use of multi-hole seals. Although both ends of cables are free during assembly, assembly conditions and assembly area may prevent cables from being easily placed into the seal.

The multi-hole seal of the invention eliminates the above mentioned disadvantages due to its structural features.

As a result, due to the above-mentioned disadvantages and the inadequacy of the existing solutions, an improvement in the technical field has been required.

The Purpose of Invention

The invention is inspired by the existing circumstances and aims to solve the above- mentioned drawbacks.

The main purpose of the invention is to develop multi-hole seal structure with tightening range. In this way, cables with different diameters can be tightened with a seal, as well as sealing and impact resistance characteristics will be preserved.

Another purpose of the invention is to provide that cables that end up with structures such as connectors etc. are assembled easily in multi-hole seals. Thanks to the slits on the multi-hole seals of the invention, cables that end with different structures are placed into the seals quickly and easily.

Another purpose of the invention is to provide that the multi-hole seal can simultaneously tighten the cables of the largest and smallest diameter in the tightening range. In the case mentioned, the seal of the invention preserves sealing, impact and tensile strength properties. For this purpose, the multi-hole seal is made of elastomer material for providing said properties. In order to provide the above-mentioned purposes, the invention is a multi-hole seal with multiple holes in the conical structure, having a top hole diameter different from the bottom hole diameter, to be used in cable glands; it contains a slit placed between the outer surface of the mentioned multi-hole seal and the mentioned hole that extends along the mentioned hole, and which allows the cables to be placed into the said hole with conical structure.

The structural and characteristic features and all advantages of the invention will be understood clearly in the figures below and in the detailed description made by referring these figures, therefore the evaluation should be made by taking these figures and detailed description into consideration.

Brief Description of the Figures

Figure 1 : General view of the multi-hole seal of the invention.

Figure 2: Top view of the multi-hole seal of the invention.

Figure 3: Section view of the multi-hole seal of the invention.

Reference Numbers

C. Multi-hole seal

10. Hole

1 1. Top hole diameter

12. Bottom hole diameter

20. Outer surface

30. Slit

Detailed Description of the Invention

In this detailed description, the preferred structures of the multi-hole seal (C) of the invention are described only for a better understanding of the subject.

Figure 1 shows a multi-hole seal (C), multiple holes (10) in the conical structure and a slit (30) on the outer surface (20) of the multi-hole seal (C) extending along the hole (10). The multi-hole seal (C) allows the cables that have different diameters to be tightened together. This allows the multi-hole seal (C) to have a certain tightening range. By means of the multi-hole seal (C) of the invention, cables that have different diameters can be tightened simultaneously. While the different cable diameters are tightened simultaneously, there is no loss in the sealing, tensile strength and other properties of the multi-hole seal (C). For example, with a multi-hole seal (C) designed to tighten the cables with 8 mm diameter in a preferred embodiment of the invention, not only cables with 8 mm diameter are tightened, also 7.5 mm; 7 mm; 6mm, etc. diameter cables can be tightened. In addition, in a hole (10) of the multi-hole seal (C), the cable with a diameter of 8 mm can be tightened, while simultaneously in the other holes (10), cables with 7.5 mm; 7 mm; 6 mm etc. diameters can be tightened. Multi-hole seal (C) is made of elastomer material. Thus, when the different cable diameters are tightened together, there is no decrease in sealing, impact and tensile strength performances. Due to the flexible and soft structure of the multi-hole seal (C), the holes (10) having a slit (30) when the cable gland is tightened are further enhanced the sealing, impact and tensile performances by sticking/rubbing to each other. In preferred embodiments of the invention, the multi-hole seal (C) is made of elastomer material having a hardness value of up to 80 Shore-A. In a preferred embodiment of the invention, the multi-hole seal (C) is produced from the single or combinations selected from the raw materials consisting of nitrile rubber, neoprene, propylene rubber, Viton©, silicone and the like.

By referring to Figure 1 and Figure 2, there is a slit (30) on the outer surface (20) of the multi-hole seal (C) of the invention extending along the hole (10). The mentioned slit (30) is defined as an opening that connects the outer surface (20) and the hole (10). Due to the slit (30), the cables are easily placed into the holes (10) of the multi-hole seal (C). This provides that the cables, which are terminated with different structures, such as connectors, etc., can be quickly and easily placed into the multi-hole seal (C). In addition, the largest diameter cables in the tightening range of the multi-hole seal (C) are easily adapted to the hole (10) with conical structure. The slit (30) of the invention provides quick and easy completion of the field assembly of the cable glands.

Referring to Figure 3, the multiple holes (10) on the multi-hole seal (C) of the invention have different upper hole diameter (11 ) and lower hole diameter (12). Thus, the hole (10) has a conical structure. The top hole diameter (1 1 ) of the mentioned hole (10) has a smaller diameter than the bottom hole diameter (12). The small diameter of the upper hole (1 1 ) allows the small cable diameters to be kept with less motion. In this way, the same cable gland performance is obtained by using the same tightening torque in the specified cable tightening range (minimum and maximum cable range). In the preferred embodiments of the invention, the tightening range of the multi-hole seal (C) is determined by the size of the top hole diameter (1 1 ) and the bottom hole diameter (12). The top hole diameter (1 1 ) determines the smallest cable diameter that the multi-hole seal (C) can tighten. The bottom hole diameter (12) determines the largest cable diameter that the multi-hole seal (C) can tighten.