JP2009055658A - Snow-resistant ring for electric wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide snow-resistant rings which can be mounted surely at specified intervals in the longitudinal direction of a transmission line, regardless of the dispersion of outside diameter, so long as the dispersion of outside diameter of the transmission lines is within the range of a tolerable error, in a snow-resistant ring to be mounted on an electric wire. <P>SOLUTION: This is a snow-resistant ring to be mounted on the outside of the electric wire, being formed into an annulus which has a detachable open end and is free of opening and closing, and the above open end free of opening and closing is equipped with a locking projection at one open end and an engaging groove at the other end which engages and catches the above locking projection, and a hinge section corrugated in cross section is formed at the specified point, circular in cross section, of the annulus. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention is a difficult snow ring that is attached to an electric wire having a twisted groove on the outer layer in a snowfall region and used to prevent electric wire from snowing. The present invention relates to a snow-resistant ring of a free size type that can be easily mounted.

Conventionally, in order to prevent electric wire snowfall on a power transmission line passing through a snowy area, it is often performed that a hard snow ring is attached to the outer periphery of the electric wire at a predetermined interval.
This kind of difficult snow ring is generally made of rubber or plastic, and for example, the hard snow ring is cut in two places in the circumferential direction so that it can be easily attached to the power transmission line. Then, a male / female fitting part is provided at each of these two incisions (Patent Document 1), or the snow-resistant ring is incised only at one place, and the male / female type is cut into this incision. A fitting part is provided, and a bending part is provided on the other end side to make it bendable (Patent Document 2).

JP 7-327313 A JP 2004-229334 A

Hereinafter, the difficult snow ring described in Patent Document 1 will be described with reference to FIG. 1 of Patent Document 1 as an example of a conventional difficult snow ring.
A conventional snow-covering ring 10 shown in FIG. 1 is formed by cutting the main body of a ring-shaped snow-covering ring at two locations to form half rings 1 and 2. 2b is rotatably supported by the shaft portion (10, 16) of the hinge portion 4, the other end is fitted to the end portion of one half ring 1, and the fitting female portion 3 is placed to the end portion of the other half ring 2. The fitting male part 12 is provided, and when this difficult snow ring is attached to the power transmission line, the fitting female part 3 and the fitting male part 12 are fitted to each other and the power transmission line is predetermined. It can be installed at intervals.

  By the way, the inner surface shape of the conventional hard snow ring including the hard snow ring shown in Patent Document 1 is true to the standard outer diameter D of the transmission line on which the hard snow ring is mounted. It is formed in a circle.

By the way, the outer diameter of the transmission line to which the hard-to-snow ring is attached is originally recognized as a tolerance with some variation centered on the standard outer diameter D. In addition, there are many manufacturers of transmission lines. Actually, the outer diameter of the transmission line varies from transmission line to transmission line.
Therefore, if the outer diameter of the transmission line is smaller than the standard outer diameter D, a gap will be formed between the inner surface of the difficult snow ring and the outer surface of the transmission line, and the difficult snow ring is firmly fixed to the transmission line. If the transmission line is not able to do so and vibrations of several tens of hertz occur due to light wind vibration, etc., the difficult snow ring moves in the longitudinal direction of the power line and accumulates in some places, so that the predetermined snow attachment ring is attached at predetermined intervals. Is greatly disturbed, and it is not possible to attach the difficult snow ring to the power transmission line in the original state at a predetermined interval, and there is a problem that the effect of difficult snow arrival is greatly reduced.

On the contrary, when the outer diameter of the transmission line is larger than the standard outer diameter D, it may be possible to install it if it is a little difficult if there is a slight difference because the hard snow ring is elastic. There is a problem that the hard-to-snow ring is broken or the life is shortened.
As described above, in the case of a conventional snow ring having a perfect circle shape on the inner surface, if the outer diameter of the transmission line on which the snow ring is attached deviates from the standard outer diameter D, the error is There is a problem that even if it is within the allowable error range allowed for the power transmission line, it may not be properly mounted.

  In addition, transmission lines that are old wires or are in a highly corrosive environment have an increased outer shape due to corrosion products formed on the inner and outer surfaces of the wires, even if they are the same size. There were cases where it was not possible to wear even a snow-resistant ring of the size. Under such circumstances, the hard-to-fall snow ring that was prepared at the corner is wasted, making it impossible to install and making the planned installation work impossible. There were inconveniences such as requiring a lot of cost and time.

  In view of the above, an object of the present invention is to provide a hard snow that can be reliably attached at a predetermined interval in the longitudinal direction of the transmission line, regardless of the variation in the outer diameter, as long as the variation in the outer diameter of the transmission line is within an allowable error range. To provide a ring.

In order to solve the above problems and achieve a desired object, the difficult snow ring of the present invention uses the following means.
(1) A snow ring which is formed into an openable / closable annular body having an detachable open end, and is attached to an electric wire,
The open end includes a locking protrusion on one open end, and a fitting groove for fitting and locking the locking protrusion on the other open end,
A hinge portion having a corrugated cross section is formed at a predetermined position of the circular cross section of the annular body.

(2) A snow ring which is formed into an openable and closable annular body having an openable and detachable open end, and is attached to an electric wire,
The open end includes a locking protrusion on one open end, and a fitting groove for fitting and locking the locking protrusion on the other open end,
A snow-reducing ring characterized in that a notch groove is formed at a predetermined location between two open ends of the annular body.

(3) In the difficult snow ring of (1) or (2),
An annular rib projecting with an increased thickness is formed on an outer surface facing outward from the center of the annular body.

Moreover, the following means can be used for the difficult snow ring of this invention.
(A) In the difficult snow ring that is attached to the power transmission line at a predetermined interval, a plurality of cut grooves (6a) and (6b) are provided at a plurality of alternating locations on the circumferential surface of the difficult snow ring.
According to such a difficult snow ring of (A), when the transmission line is thinner than the standard outer diameter D, the plurality of cut grooves (6a), (6b) of the hard snow ring are expanded and contracted by the fitting force. As a result of being freely deformed, the surface of the power transmission line can be reliably gripped even when it is thicker than the standard outer diameter D.

(B) The difficult snow ring of the present invention omits the plurality of cut grooves (6a), (6b) of the hard snow ring of (A), and instead has a shape similar to that of the hinge part (3). The hinge part (3a) or (3b) is provided.
According to the difficult snow ring of (B) thus formed, even when the outer diameter of the power transmission line to which the hard snow ring is attached is larger than the standard outer diameter D of the power transmission line, it is provided at a plurality of locations. Since the hinge portion is deformed by the fitting force and the elongation rate extending in the circumferential direction can be set large, the hinge portion can be easily attached to the power transmission line sufficiently corresponding to the outer diameter fluctuation.

  As described above, according to the present invention, even if the outer diameter of the transmission line is thicker than the outer shape of the standard electric wire, it is possible to cope with problems without difficulty, and it is difficult to attach snow at a predetermined interval in the longitudinal direction of the transmission line. A ring can be provided.

Below, the difficult snow ring of this invention is demonstrated in detail using an accompanying figure. In FIG. 1 and FIG. 2 according to the embodiment, the same parts are denoted by the same reference numerals.
1 and 2 show an embodiment of a difficult snow ring of the present invention, and FIG. 1 is a type in which cut grooves are alternately provided in the circumferential direction of the difficult snow ring. 1 (a) is a perspective view before fitting of a difficult snow ring to be attached to a power transmission line, and FIG. 1 (b) is a front view showing a state where the ring is attached to an electric wire (C).

  As shown in FIG. 1, the difficult snow ring 1 of the present invention is covered with the power transmission line (C) with the incised portion widened, and groove walls (7a), (7b) on the back surface of the hard snow ring 1 are shown. ) Is pulled by the mounting jig, the fitting female part 4 and the fitting male part 5 are fitted, for example, firmly fixed on the power transmission line at intervals of 300 mm to 500 mm. In this mounting operation, even if the outer shape of the electric wire is thick due to corrosion or the like, a plurality of cut grooves are provided alternately in the circumferential direction of the difficult snow ring, so the cut grooves are opened as shown in FIG. As the inner circumference of the hard-to-snow ring is substantially extended, the mounting operation is not hindered. The length of the cut groove can be as deep as 3/4 or 4/5 of the ring width, depending on the material and material of the hard-to-fall snow ring. It should be round.

The feature of the difficult-to-snow ring 10 of another embodiment shown in FIG. 2 is as described above by providing the hinge part (3a) or (3b) having the same shape as the hinge part (3) having a corrugated cross section. Thus, even if the outer shape of the wire is thick due to corrosion, etc., by providing multiple hinges in the circumferential direction of the hard-to-cover snow ring, the hinge can be deformed and extended to easily cope with the increase in the outer shape of the wire It is something that can be done.
Here, the hinge portions (3), (3a), and (3a) of the corrugated cross section of the difficult snow ring 10 are set to be thinner than the round cross section of the hard snow ring, and the cross section is W-shaped or It is formed into a wave shape such as a U shape to form a hinge structure, which has improved elasticity, stretchability, openability, and the like.

  The material of the difficult snow ring 1 or 10 of the present invention is made of rubber, plastic or the like as in the conventional one. Incidentally, as the plastic, it is possible to use various resins that are already known as materials for snow-resistant rings such as polyether ether ketone, polyphenylene sulfide, and polycarbonate.

  By the way, since the rubber and plastic used for the hard-to-snow ring are generally hard, it is difficult for them to become familiar with each other and to slip in the circumferential direction when fitted to an electric wire, and it is difficult to obtain a predetermined gripping force. In such a case, for example, the burr-like protrusion correction ribs (2a, 2b) shown in FIGS. 1 and 2 of the present invention are provided over the entire outer circumferential direction of the ring or intermittently. By doing so, the gripping force is stable and preferable.

  Moreover, although the Example mentioned above demonstrated in the example which provided the two or three cut grooves and the hinge part in the circumferential direction of the difficult snow ring 1 or 10, this invention is such a shape and installation location. It is not limited to the number, and it goes without saying that the size of the hard-to-snow ring is also changed according to the outer diameter of the electric wire and can be changed as appropriate.

  As described above, according to the difficult snow ring of the present invention, even if the variation in the outer diameter of the transmission line exceeds the allowable error range, the longitudinal direction of the transmission line is not affected by the variation in the outer diameter. Thus, it is possible to provide a hard snow ring that can be securely fixed and mounted at predetermined intervals.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows one embodiment of a difficult snow ring of the present invention, in which (A) is a perspective view and (B) is a side view fitted on an electric wire. FIG. 2 shows another embodiment of the difficult snow ring of the present invention, in which (A) is a perspective view of the hard snow ring, (B) is a front view when fitted to an electric wire, and (C) is a side view thereof. It is.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hard snow ring of 1st Example 2a, 2b Reinforcement rib 3, 3a, 3b Hinge part 4 Locking protrusion (it arrange | positions at one open end of an open end part)
5 Fitting groove (arranged at the other open end of the open end)
6a, 6b Cut groove 7a, 7b Groove wall portion 10 Difficult snow ring of the second embodiment C Electric wire

Claims (3)

A ring that is openable and closable with an open / close end that can be freely engaged and disengaged.
The open end includes a locking protrusion on one open end, and a fitting groove for fitting and locking the locking protrusion on the other open end,
A hard snow ring characterized in that a hinge portion having a corrugated cross section is formed at a predetermined portion of the circular cross section of the annular body. A ring that is openable and closable with an open / close end that can be freely engaged and disengaged.
The open end includes a locking protrusion on one open end, and a fitting groove for fitting and locking the locking protrusion on the other open end,
A difficult snow ring having a cut groove formed at a predetermined position between the two open ends of the annular body. The difficult snow ring according to claim 1 or 2,
A hard snow ring characterized by forming an annular rib projecting with an increased thickness on an outer surface facing outward from the center of the annular body.

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