JP6781520B2 - Cable sheath fixing spacer and cable fixture - Google Patents

Description

The present invention is used for a cable fixture for closures, a spacer for fixing a cable sheath that prevents damage to the core wire when fixing a cable having a thin cable sheath, and a cable fixing including this spacer. Regarding ingredients. More specifically, the present invention relates to, for example, a spacer for fixing a cable sheath and a cable fixture that are optimal for fixing an optical cable introduced inside a closure.

As an optical cable fixture in the closure for an optical cable, for example, the one described in Patent Document 1 is known.
4 (a) to 4 (d) show the usage state of the optical cable fixture described in Patent Document 1.

In FIG. 4A, a gripping bolt (demon bolt) 41 having a bolt body 41a and a gripping portion 41b is attached to the U-shaped member 40a. Further, a grip portion 42 is attached to the inner surface of the U-shaped frame 40b so as to face the grip portion 41b.
Note that C indicates an optical cable to be fixed.

As a procedure for fixing the optical cable C, first, as shown in FIGS. 4 (b) and 4 (c), the optical cable C is held down by the grip portion 42 of the frame 40b, and the stopper 43 is inserted into the slit 40c of the U-shaped member 40a. It is inserted to lock the grip portion 42.
Next, as shown in FIG. 4D, the gripping bolt 41 is screwed in the direction of the optical cable C, and the outer peripheral surface of the optical cable C is gripped from above and below by the gripping portion 41b and the gripping portion 42.
According to this conventional technique, the optical cable C can be firmly fixed in the internal space of the U-shaped member 40a.

By the way, the thickness of the cable sheath of the optical cable C varies, and is, for example, 1.5 [mm] and 1.8 [mm] for a general cable and 2.0 [mm] for a flame-retardant cable.
However, when the optical cable C is fixed by the method shown in FIG. 4, the needle-shaped tips of the grips 41b and 42 bite into the cable sheath. Therefore, when the thickness of the cable sheath is thin, the needle-shaped tips are formed. There is a risk of breaking through the cable sheath and damaging the internal core wire.

As the cable fixture that does not use the grip portions 41b and 42 having the needle-shaped tip portion described above, the one described in Patent Document 2 is known.
5A and 5B show a gripping spacer 30 for a cable fixture described in Patent Document 2, where FIG. 5A is a plan view, FIG. 5B is an exploded plan view, and FIG. 5C is a perspective view.

The gripping spacer 30 is configured to be able to add or remove spacers 30a, 30b, 30c having cable pressure contact surfaces 30a1, 30b1, 30c1 having different radii so as to fit a plurality of types of cables having different outer diameters.
When fixing the cable, a pair of gripping spacers 30 configured according to the outer diameter of the cable are fixed inside the closure (not shown), and the outer peripheral surfaces of the cable are pressure-welded from both sides by the respective cable pressure contact surfaces. It is a thing.

Japanese Unexamined Patent Publication No. 2008-96667 (paragraphs [0025], [0026], FIG. 6, etc.) Japanese Patent No. 3914309 (paragraphs [0006] to [0013], FIG. 3, etc.)

By using the gripping spacer 30 shown in FIG. 5, it is possible to fix the cable without damaging the cable sheath or the core wire inside.
However, in this conventional technique, it is necessary to prepare a plurality of spacers 30a, 30b, 30c according to the outer diameter of the cable, and there is a problem that the number of parts increases and the cost increases.

Therefore, the problem to be solved by the present invention is a spacer for fixing a cable sheath that can be manufactured at low cost without damaging the internal core wire even for a cable having a thin cable sheath, and this spacer. The purpose is to provide a cable fixture using the above.

In order to solve the above problem, the spacer for fixing the cable sheath according to claim 1 has a needle-shaped portion protruding from a grip portion at one end in the axial direction of the bolt body constituting the demon bolt, and tightening the demon bolt. A spacer for fixing the cable sheath that is placed between the cable sheath of the cable that is fixed by
The side piece is provided with a base piece that is entirely made of plastic and has a bolt insertion hole into which the bolt body is inserted, and a pair of side pieces that are bent from both ends of the base piece. Has a restoring force in the direction away from the base piece,
By tightening the demon bolt into which the bolt body is inserted into the bolt insertion hole, the side piece is pressed against the tip of the needle-shaped portion and the outer peripheral surface of the cable sheath.

The cable sheath fixing spacer according to claim 2 is the cable sheath fixing spacer according to claim 1, characterized in that a notch is formed in the side piece.

The cable sheath fixing spacer according to claim 3 is the cable sheath fixing spacer according to claim 1 or 2, wherein the cable is an optical cable.

In the cable fixture according to claim 4, a pair of the demon bolts are arranged on the fixing bracket inside the closure into which the cable is introduced so that the needle-shaped portions face each other, and the pair of the demon bolts are arranged. The cable sheath fixing spacer according to any one of claims 1 to 3 is attached to the cable sheath.

According to the cable sheath fixing spacer and the cable fixing tool according to the present invention, the internal core wire is not damaged even when a cable having a thin cable sheath thickness is fixed. Further, since the spacer for fixing the cable sheath can be easily manufactured by processing a plastic sheet member, it can be provided at low cost.

It is a perspective view of the spacer for fixing a cable sheath which concerns on embodiment of this invention. It is a side view of the cable fixture which concerns on embodiment of this invention. It is a perspective view of the cable fixture which concerns on embodiment of this invention. It is a figure which shows the use state of the optical cable fixture described in Patent Document 1. FIG. It is explanatory drawing of the gripping spacer in the cable fixture described in Patent Document 2.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, FIG. 1 is a perspective view of a cable sheath fixing spacer (hereinafter, also simply referred to as a spacer) 10 according to an embodiment of the present invention.

In FIG. 1, the spacer 10 is manufactured by processing a transparent or milky white PET (polyethylene terephthalate) or other plastic sheet member. Bolt insertion holes 11a for inserting the bolt bodies 21a and 31a of the demon bolts 21 and 31 described later are formed in the central portion of the substantially rectangular base piece 11, and a plurality of through holes 11b and 11c are formed around the bolt insertion holes 11a. Is formed.

Side pieces 12 and 13 are continuously provided on the left and right short sides of the base piece 11 by bending, and notches 12a and 13a are formed in these side pieces 12 and 13.
The side pieces 12 and 13 can be bent inward and outward as shown by the arrow a, and the restoring force (elastic force) in the direction of the arrow b is retained by appropriately selecting the material and the wall thickness. There is.

FIG. 2 is a side view of the cable fixture showing the usage state of the spacer 10, and FIG. 3 is a perspective view. FIG. 2 is an explanatory view in the case of fixing the optical cable C drawn into the closure.
The shape and structure of the cable fixture are not limited to the illustrated examples, and can be appropriately changed according to the structure of the closure and the like.

When using the spacer 10, first, the bolt bodies 21a and 31a of the demon bolts 21 and 31 are inserted into the bolt insertion holes 11a of the pair of spacers 10, respectively, and formed at one end of the bolt bodies 21a and 31a in the axial direction. The demon bolts 21 and 31 are screwed into the upper jaw portion 20a and the lower jaw portion 20b of the fixing bracket 20 so that the gripped portions 21b and 31b (needle-shaped portions 21c and 31c) face each other. Here, the fixing bracket 20 is installed inside a closure (not shown).

Since the base piece 11 of the spacer 10 is formed with a plurality of through holes 11b and 11c, it is easy to deform the base piece 11 and the adhesion of the demon bolts 21 and 31 to the grip portions 21b and 31b is improved. Can be enhanced.

Next, with the side pieces 12 and 13 bent inward, the optical cable C to be fixed is positioned between the grip portions 21b and 31b, and then the demon bolts 21 and 31 are tightened so as to sandwich the optical cable C. ..
As a result, the inner surfaces of the side pieces 12 and 13 of the spacer 10 are pressure-contacted by most of the needle-shaped portions 21c and 31c provided in the grip portions 21b and 31b, and the outer surfaces of the side pieces 12 and 13 are the outer peripheral surfaces of the optical cable C. It is in close contact with (the outer peripheral surface of the cable sheath) and is pressure-welded.

Here, the side pieces 12 and 13 of the spacer 10 have a restoring force in the direction indicated by the arrow b in FIG.
Therefore, when the demon bolts 21 and 31 are tightened, the outer peripheral surface of the cable sheath can be pressed against the entire outer surface of the side pieces 12 and 13 while suppressing the force of the needle-shaped portions 21c and 31c biting into the cable sheath to some extent.

Further, the side pieces 12 and 13 can be easily deformed by the action of the notches 12a and 13a formed in the side pieces 12 and 13. Therefore, the side pieces 12 and 13 can be appropriately deformed and brought into close contact with the outer peripheral surface of the cable sheath, and the optical cable C can be securely and firmly fixed in combination with the tightening force of the demon bolts 21 and 31.

As described above, there are various thicknesses of the cable sheath such as 1.5 [mm], 1.8 [mm], and 2.0 [mm]. On the other hand, in the present embodiment, even if the wall thickness of the cable sheath is 1.5 [mm], there is a possibility that the needle-shaped portions 21c and 31c may break through the cable sheath and damage the internal core wire. Absent.

As described above, according to the present embodiment, it is possible to securely fix the optical cable C while preventing damage to the core wire and the cable sheath of various optical cables C from thin to thick cable sheaths. ..

The above-described embodiment is the case where the present invention is applied to an optical cable fixture, but the present invention is also applied to a metal cable fixture and a composite cable fixture including an optical cable and a metal cable. be able to.

10: Cable sheath fixing spacer 11: Base piece 11a: Bolt insertion holes 11b, 11c: Through holes 12, 13: Side pieces 12a, 13a: Notch 20: Fixing bracket 20a: Upper jaw 20b: Lower jaw 21, 31: Demon bolt 21a, 31a: Bolt body 21b, 31b: Grip portion 21c, 31c: Needle-shaped portion C: Optical cable

Claims (4)

A cable sheath arranged between a needle-shaped portion protruding from a grip portion at one end in the axial direction of a bolt body constituting the demon bolt and a cable sheath of a cable fixed by tightening the demon bolt. It is a spacer for fixing
The side piece is provided with a base piece that is entirely made of plastic and has a bolt insertion hole into which the bolt body is inserted, and a pair of side pieces that are bent from both ends of the base piece. Has a restoring force in the direction away from the base piece,
A cable characterized in that the side piece is pressure-welded between the tip of the needle-shaped portion and the outer peripheral surface of the cable sheath by tightening the demon bolt into which the bolt body is inserted into the bolt insertion hole. Spacer for fixing the sheath. In the spacer for fixing the cable sheath according to claim 1,
A spacer for fixing a cable sheath, characterized in that a notch is formed in the side piece. In the cable sheath fixing spacer according to claim 1 or 2.
A spacer for fixing a cable sheath, wherein the cable is an optical cable. A pair of the demon bolts are arranged on the fixing bracket inside the closure into which the cable is introduced so that the needle-shaped portions face each other, and the pair of the demon bolts has any one of claims 1 to 3. A cable fixture characterized in that each of the spacers for fixing the cable sheath described in item 1 is attached.

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