JPH0353536Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a cable gland used when attaching an electric wire cable to a terminal box or the like.

(Conventional technology and problems) For example, in order to supply power to each site in a factory, an electric wire cable with multiple electric wires inserted through it is drawn into the factory, and this electric wire cable is connected to a terminal with a terminal installed inside. The wires are inserted and fixed into the box, and each wire is connected to the corresponding terminal. In this case, if the terminal box is installed in a hazardous location such as a gasoline atmosphere, so-called explosion-proof wiring work is performed. One example is to screw a thick steel conduit to the cable intake provided on the bottom plate of the terminal box, and then insert the wire (cable) into the thick steel conduit to protect the wire. The wire is clamped using a clamp member and its end is connected to the terminal.
In this case, during new construction or repair work, many tasks such as attaching and removing thick steel conduit to the terminal box, inserting wires, and attaching and removing clamping materials must be performed, which takes a lot of time. was.

(Means for Solving the Problems) The present invention has been made to solve the above-mentioned problems. It has a main body part with a cylindrical shape carved therein, and a tightening part extending in a cylindrical shape in the axial direction from the main body part, and the tightening part extends over a certain length from the tip thereof in the radial direction. a gland body that is divided into a plurality of comb teeth by a plurality of grooves provided along an inclined direction; a threaded part that is threaded into the thread of the main body part; and a threaded part that extends in the axial direction from the threaded part, A cable gland is provided that includes a gland nut including a pressure contact portion whose inner diameter gradually decreases toward the tip, and a sealing gasket disposed inside the tightening portion.

(Example) An example of the present invention will be described below based on the drawings.

FIG. 1 is a front view showing a state in which a cable 4 is attached to a bottom plate 3 of a terminal box 2 using a cable gland 1 according to an embodiment of the present invention. The cable gland 1 has a hexagonal flange portion 1 of the gland body 10.
2 and a locking nut 40 that is screwed into the threaded part 13 carved in the upper part of the bottom plate 3 of the terminal box 2.
It is attached to the terminal box by holding it in place. The cable 4 is inserted through the cable gland 1 and is held in a sealed state by a gland body 10 and a gland nut 20, as will be described later.

Figure 2 shows the cable gland 1 according to this embodiment.
FIG. 3 is a side view showing only the right half of the gland main body 10, and FIG. 4 is a partially sectional end view taken along the line of FIG. 2. The main body part 11 of the gland main body 10 has threaded parts 13 and 14 with a hexagonal flange 12 in between.
is provided, and has a through hole 15 therein. A tightening part 16 is provided which extends cylindrical in the axial direction from this main body part 10. As is clear from FIGS. 3 and 4, this tightening part 16 extends from the tip of the main body part 11 It is divided into cylindrical comb-teeth shapes by a plurality of grooves 17 that are formed at an angle with respect to the radial direction.
Further, as can be seen from FIG. 2, a shoulder portion 18 is provided inside the tightening portion 16, and one end of a sealing gasket, which will be described later, is brought into contact with this shoulder portion 18 to be positioned. Similarly, as can be seen from FIG. 2, the outer diameter of the tightening portion 16 gradually decreases toward the tip, and the axial cross-sectional shape is partially arcuate, and the inner diameter is also very close to the tip. It gradually decreases and has a small arc-shaped axial cross-sectional shape. The tightening portion 16 has a shape in which the wall thickness gradually decreases toward the tip.

FIG. 5 is a front view with the upper half of the gland nut 20 in section. The gland nut 20 is provided with a female screw portion 21 that is screwed into the screw portion 14 of the gland body, and a pressure contact portion 22 that extends from the screw portion 21 in the axial direction and whose inner diameter gradually decreases. Therefore, Grand Nut 20
The threaded portion of the gland body 10 is screwed into the threaded portion 14 of the gland body 10, and as it is rotated, the tapered inner surface 23 of the pressure contact portion 22 becomes a comb of the tightening portion 16 of the gland body 10, which has a cylindrical comb shape. Tip 19 of tooth 19
a to bend the tip 19a inward to reduce its diameter.

FIG. 6 is a front view of the gland body 10, cylinder packing 30, and gland nut 20 assembled together, with the upper half taken in section. When the gland nut 20 is rotated from this state, the inner surface 23 of the pressure contact part 22 of the gland nut 20 is rotated against the tightening part 1 of the gland main body 10, as described above.
Since the distal end 19a of the comb teeth 19 of No. 6 is bent by contacting the distal end 19a, the distal end 19a gradually reduces its diameter while pressing the sealing gasket 30 onto the outer periphery of the electric wire cable 4 inserted inside, thereby sealing. At the same time, the cable 4 is fixed to the cable gland 1.

Incidentally, as the comb tooth tips 19a are bent inward and reduced in diameter, the space of the split 17 first narrows, and eventually the adjacent comb teeth 19 come into contact with each other. When the gland nut 20 is further rotated, the diameter is reduced while sliding occurs between adjacent comb teeth, as shown in FIG. Therefore, it is possible to reduce the diameter much more than when the splits are inserted in the radial direction, and even if the wire cable is not a perfect circle, but is, for example, oval, the gap between the comb teeth can be reduced depending on the position. The amount of relative slip changes and corresponds to the shape, allowing for good sealing and cable fixation.

In use, the gland body 10 is fixed to the bottom plate 3 of the terminal box 2 using a locking nut 40. Next, the gland nut 20 is inserted into the connecting side of the cable 4 to the terminal, and after the cable 4 is guided into the terminal box through the sealing packing 30, the gland nut 20 is screwed to the gland body 10. Removal can also be easily done by simply loosening the gland nut 20.

(Effects of the invention) Since the cable gland according to the invention has the above-described configuration, the tightening allowance for the gland nut can be increased, and the range of outer diameter dimensions of the applicable electric wire cable can be widened. Further, the present invention can be applied even if the cable shape is not circular. It also provides effective sealing and securely secures the cable. In addition, it is easy to attach and detach the cable to the terminal box.

[Brief explanation of drawings]

FIG. 1 is a front view showing a state in which a cable is attached to a terminal box using a cable gland according to an embodiment of the present invention, FIG. 2 is a front view with the upper half of the gland main body in cross section, and FIG. The figure is a side view showing only the right half, Figure 4 is a sectional view along the line of Figure 2, Figure 5 is a front view of the gland nut with the upper half taken in section, and Figure 6 is a cable gland. FIG. 7 is a partial front view showing the state of deformation of the comb teeth of the tightening portion of the gland body. 1: cable gland, 10: gland body,
16: Tightening part, 19: Comb teeth, 20: Grand nut, 22: Pressure contact part, 30: Sealing butt.

Claims (1)

[Claims for Utility Model Registration] A main body having a central hole passing through the interior and having a screw carved into at least a part of its outer periphery, and a tightening bolt extending in a cylindrical shape from the main body in the axial direction. and a gland in which the tightening part is divided into a plurality of comb teeth by a plurality of grooves provided along a direction inclined with respect to the radial direction over a certain length from the tip thereof. A gland nut consisting of a main body, a threaded part that is screwed into the thread of the main body part, and a pressure contact part that extends from the threaded part in the axial direction and whose inner diameter gradually decreases toward the tip; A cable gland characterized by consisting of a sealing patch located inside.