JPH0833172A - Vibrationproof suspension clamp - Google Patents

Abstract

PURPOSE:To regulate tightening force by a bolt and nut to within a creep limit of an insert by connecting an end part on the opposite side to a hanging lug part of a hanging hook piece by a hinge pin, providing a bolt and nut tightening the hanging lug part to each other, and forming protrusions on the hanging lug part side of a fitting part. CONSTITUTION:A hanging hook 34 comprises semi-cylindrical fitting parts 40 and a pair of hanging hook pieces 32, 33 opposed to a hanging Jug part 42, to perform hinge-connecting the hanging hook by a hinge pin 48. The hanging lug parts are fixedly tightened to each other by a bolt 51 and nut 52. On the other hand, protrusions 40a are provided on the hanging lug part 42 side. In this way, even when the nut 52 is temporarily overtightened, since the protrusions 40a are brought into contact with each other to regulate contraction of internal diameter or more of both the fitting parts 40, fastening force by hanging hook pieces 32, 33 is prevented from unreasonably increasing, to prevent insertion beyond a creep limit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration-resistant suspension clamp for suspending and supporting an overhead power transmission line so that its vibration is suppressed.

[0002]

2. Description of the Related Art In a suspension tower of an overhead transmission line, when a vibration-resistant suspension clamp (AGS clamp) as shown in FIGS. 5 and 6 is used as a suspension clamp attached to the tip of a suspension insulator device for gripping an electric wire. There is. This vibration-resistant suspension clamp 1 covers a wire 2 with a two-piece insert 3 made of, for example, neoprene rubber or the like, and a plurality of armor rods 4 having a spiral shape with a bulged central portion on the outer circumference of the insert 3. Are wound back to back, and have a fitting portion 12 having a semi-cylindrical inner surface and a hanging ear portion 14 integrated with the fitting portion 12, and the outer contour is substantially U when facing each other.
A cylindrical inner surface formed by the two fitting portions 12 of the hanging metal fitting 7 divided into two, which is composed of a pair of hanging metal pieces 5 and 6 holding the outer periphery of the armor rod group 4 and extending along the outer surface of the metal fitting 7 An outer surface of the hanging metal fitting 7 is covered with a plate-shaped fastening metal fitting 9 having a letter shape, and the hanging ear portion 14 of the hanging metal fitting 7 and the fastening metal fitting 9 are attached.
The bolt 10 is passed through the screw insertion holes 14a and 9b formed by penetrating both of the ear pressing portions 9a corresponding to the hanging ear portions 14, respectively, and the nut 11 screwed into the bolt 10 is tightened to grasp the electric wire 2. It is a structure that does. The suspending metal 7 is usually integrally formed of aluminum alloy or the like. Also,
Reference numeral 15 is a spring washer, and reference numeral 16 is a split pin for retaining.

Since the vibration-resistant suspension clamp 1 has a rubber insert 3 and has a structure in which the elastic gripping force of the armor rod 4 is effectively used, vibration of the electric wire 2 due to wind or the like is caused. It is characterized by excellent vibration resistance that can be effectively suppressed. Moreover, because it is much lighter than the suspension clamp of the conventional structure, it is also used as the wire gripping part of the interphase spacer that requires weight reduction.

[0004]

In the vibration-resistant suspension clamp 1 described above, the gripping force with respect to the electric wire 2 is determined by the hanging metal fitting 7.
When tightening the U-shaped fastener 9 that covers the outer surface of the bolt with bolts 10 and nuts 11, the fastener 9 functions like a spring, and the entire hanging hardware 7, armor rod 4, and insert 3 are tightened from the outside. Caused by. Therefore, the left and right screw insertion holes 9b of the fastener 9 are
9b is a hole interval L along the inner surface of the fastener (see FIG. 9B).
It is necessary to properly set the screw insertion holes 14a of No. 6 according to the hole interval along the outer surface of the hanging metal fitting, and the diameter of the screw insertion hole 9b of the fastening metal 9 and the screw insertion of the hanging metal pieces 5, 6 It is necessary to make the diameter of the hole 14a substantially equal. In addition, the hole intervals of the fasteners 9 are the insert 3 and the electric wire 2.
Set in consideration of the creep of.

When the vibration-resistant suspension clamp 1 is assembled, for example, when the outer diameter of the armor rod 4 becomes uneven and the apparent outer diameter becomes large, the bolt 10 is opposite to the insertion side. In the above, the situation in which it cannot be inserted into the screw insertion hole 9b of the fastener 9 easily occurs. In this case, it is necessary to reassemble it. However, for example, when it is used for the interphase spacer, it is a power outage work and it is carried out by a suspended work in the middle of the tower tower. Will cause it. Therefore, careful and accurate assembly had to be performed, and the work was not easy.

In order to eliminate the above-mentioned inconvenience, it is conceivable to set the hole diameter of the screw insertion hole 9b to be sufficiently larger than that of the screw insertion hole 14a or to make it a long hole. In this case, the screw insertion hole 9b is used. A marginal defect occurs in that the tightening function of the fastener 9 is deteriorated by the amount of allowance and sufficient tightening force is not generated, resulting in insufficient gripping force of the electric wire 2.

The present invention has been made in order to solve the above-mentioned conventional drawbacks, and it is possible to obtain a sufficiently large electric wire gripping force without deteriorating the tightening function of the fastener even without assembling with strict accuracy. Therefore, it is an object of the present invention to provide a vibration-resistant suspension clamp that can be easily assembled.

[0008]

SUMMARY OF THE INVENTION According to the present invention for solving the above-mentioned problems, a plurality of armor rods are wound back to back around the outer periphery of an insert made of an elastic material covering an electric wire, and a semi-cylindrical fitting portion and this fitting portion are fitted together. A structure in which the outer periphery of an armor rod group wound around the outer periphery of the insert is held by the fitting portion of a two-divided hanging metal fitting including a pair of facing metal fitting pieces having a mating portion and an integral hanging ear portion. In the vibration-resistant suspension clamp, the hinge pin for hinge-connecting the ends of the pair of opposing hanging metal fittings on the opposite side to the hanging ear portions, and the screw insertions opened through the hanging ear portions of both hanging metal fitting pieces. Bolts and nuts that are inserted through the holes to tighten the hanging ears of both hanging metal fittings to each other, and bolts and nuts that are formed on the hanging ears side of the fitting part to secure the tightening force of the bolts and nuts to the creep of the insert. Characterized in that a protrusion for restricting within limits.

[0009]

When the electric wire is gripped by the vibration-proof suspension clamp having the above-mentioned structure, the electric wire is covered with an insert, a plurality of armor rods are wound back to back around the outer circumference, and the fitting portions of the two hanging metal fittings opened around the hinge pin are used to Hold the central part of the armor rod group, and tighten the nuts that are screwed into the bolts that passed through the screw insertion holes of the hanging ears of both hanging metal fittings.
Tighten the suspension ears of both suspension metal fittings together. In this case, even if the nut is tightened too much, it is regulated that the projections formed on the hanging ear side of the fitting portion of the hanging metal piece come into contact with each other and the inner diameter of the fitting portion is further reduced. Therefore, the tightening force of both suspension metal fittings does not increase unnecessarily. Therefore, the insert will not be tightened beyond the creep limit and vibration resistance characteristics can be maintained. Since the size of the screw insertion holes of both suspension metal fittings does not affect the wire gripping force of the suspension metal fittings, the screw insertion holes can be enlarged with a margin, and therefore the operation of inserting the bolt is easy, This vibration-resistant suspension clamp is easy to assemble.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a vibration-resistant suspension clamp 3 according to an embodiment of the present invention.
0 is a front view, and FIG. 2 is a side view of the same. Although not shown in FIGS. 1 and 2, the vibration-resistant suspension clamp 30 is shown in FIG.
Similarly to the vibration-proof suspension clamp 1 shown in FIG. 6, the outer periphery of the electric wire 2 is covered with a two-piece insert 3 made of, for example, neoprene rubber or the like, and the outer periphery of the insert 3 has a spiral shape with a bulged central portion. The eggplant armor rod 4 is wound back to back, and the outer periphery of the armor rod 4 is held by a cylindrical fitting portion of a hinged-type split hanging metal fitting 34 described below. That is, as shown in FIGS. 1 and 2, the hanging metal fitting 34 has a pair of facing metal fittings having a semi-cylindrical fitting portion 40 and a hanging ear portion 42 integrated with the fitting portion 40. Consists of pieces 32 and 33, both suspension metal pieces 3
2, 33 are hinge-coupled by hinge pins 48 at ends opposite to the hanging ears 42, and bolts 51 inserted into screw insertion holes 42a formed through both the hanging ears 42 and the bolts 51 are screwed. It is adapted to be tightened and fixed in a closed state by a mating nut 52. Then, the hanging ear portion 4 of the fitting portion 40 of the two hanging metal fitting pieces 32, 33.
The second side is provided with a protrusion 40a for restricting the tightening force of the bolt 51 and the nut 52 within the creep limit of the insert 3. The gap s between the two protrusions 40a is, for example, about 2 mm although it depends on the size of each part.
The diameter of the screw insertion hole 42a of each of the hanging metal pieces 32 and 33 is made larger than the diameter of the shaft portion 50 of the bolt 51 with a sufficient margin. Usually, the hanging metal fitting 34 is preferably an aluminum alloy casting for an aluminum electric wire and a copper alloy casting for a copper electric wire. Further, the hinge pin 48 is preferably a steel rod. Further, reference numeral 53 is a cotter pin for retaining, reference numeral 54 is a spring washer, and reference numeral 55 is a spring pin for retaining the hinge pin 48.

When the electric wire 2 is gripped by the vibration-proof suspension clamp 30 having the above-mentioned structure, the electric wire 2 is covered with the insert 3, a plurality of armor rods 4 are wound back to back around the outer periphery of the electric wire 2, and both hanging metal fittings opened around the hinge pin 48 are provided. Piece 3
The central portion of the armor rod 4 group is held by the fitting portions 40 of Nos. 2 and 33, and the bolt 51 is inserted into the screw insertion hole 42a of the hanging ear portion 42 of both hanging metal fitting pieces 32 and 33. In this case, since the screw insertion holes 42a of the hanging fitting pieces 32 and 33 are made larger than the diameter of the shaft portion 50 of the bolt 51, as described above, for example, the armor rod 4 is unevenly wound around the outer periphery of the insert 3. Even if the diameter becomes large, the tip side of the bolt 51 should be attached to the screw insertion holes 4 of the two hanging metal fittings 32, 33.
2a can be easily passed. Therefore, the vibration-proof suspension clamp 30 can be easily assembled. Further, since the size of the screw insertion hole 42a does not affect the wire gripping force,
The screw insertion hole can be a long hole. As a result, the operation of inserting the bolt 51 into the screw insertion hole becomes easier, and the workability is further improved.

Next, a nut 52 is screwed into the bolt 51 and the nut 52 is tightened to fix both hanging metal fitting pieces 32, 3
The hanging ears 42 of No. 3 are clamped and fixed to each other. In this case, even if the nut 52 is tightened too much,
Since the protrusions 40a of the fitting portions 40 of the fitting portions 40 of the Nos. 2 and 33 on the side of the hanging ear portion 42 contact each other and further reduction of the inner diameters of the fitting portions 40 is restricted, tightening with the hanging metal fitting pieces 32 and 33 is performed. Power does not increase excessively. Therefore, there is no risk that the insert 3 will be tightened beyond the creep limit and lose the elasticity necessary for the insert 3 to absorb vibration, and the vibration resistance of the vibration resistant suspension clamp 30 can be maintained.

The vibration-proof suspension clamp of the present invention has a structure in which one end side is hinged and the other end side is bolted, unlike the conventional tightening method using a combination of a suspension fitting and a fastening fitting. As a measure to prevent the nut from rotating, it is possible to use a hard lock nut that is a type of double nut and uses the tightening frictional force of the nut.

3 and 4 show another embodiment of the present invention.
The basic construction of the vibration-proof suspension clamp 60 of this embodiment is the same as that shown in FIGS. 1 and 2, but the nut to be used on the outer surface side of the screw insertion hole 42a portion of one of the suspension fitting pieces 32. A counterbore counterbore 61 is formed to match the width across flats of the hexagonal head 52. Since the nut 52 is prevented from rotating by the counter rotating counterbore 61, only the head of the bolt 51 needs to be tightened.
Workability is further improved.

[0015]

According to the present invention, even if the bolts and nuts for fastening the hinge joints of the pair of hanging metal fittings and the opposite hanging ears to each other are tightened too much, the two fittings are fitted together. Since the projections on the hanging ear side of the part are prevented from hitting each other and the inner diameter of the fitting part is further reduced, the tightening force by both hanging metal pieces does not increase unnecessarily, so the insert exceeds the creep limit. It is not tightened and the vibration resistance can be maintained. And
Since the size of the screw insertion holes of both suspension metal fittings does not affect the wire gripping force of the suspension metal fittings, it is possible to make the screw insertion holes large with a margin, thus facilitating the operation of inserting the bolts. Assembly workability of vibration resistant suspension clamp is improved. Further, the number of parts can be reduced as compared with the conventional structure in which the hanging metal fittings and the fastening metal fittings are provided as separate members, and in this respect also, the complexity is eliminated and the workability is improved.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a vibration-resistant suspension clamp of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a front view showing another embodiment of the vibration-proof suspension clamp of the present invention.

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a side view of a conventional seismic suspension clamp.

6 is a cross-sectional view of the seismic suspension clamp of FIG.

7 is an enlarged view of a fastener in the seismic suspension clamp of FIG. 5, FIG. 7 (a) is a front view, and FIG. 7 (b) is a side view.

[Explanation of symbols]

 2 Electric wire 3 Insert 4 Armor rod 30,60 Vibration-resistant suspension clamp 32,33 Hanging metal fitting piece 34 Hanging metal fitting 40 Fitting part 40a Protrusion 42 Hanging ear part 42a Screw insertion hole 48 Hinge pin 51 Bolt 52 Nut 61 Counterbore part for non-rotation

Claims (2)

[Claims] 1. A plurality of armor rods are wound back to back on the outer periphery of an insert made of an elastic material covering an electric wire, and the semi-cylindrical fitting portion and a hanging ear portion integral with the fitting portion are provided. In a vibration-resistant suspension clamp having a structure in which the outer periphery of an armor rod group wound around the outer periphery of the insert is held by the fitting portion of a two-divided suspension metal fixture composed of a pair of opposing suspension metal fixture pieces, A hinge pin for hinge-connecting the end of the hanging metal piece opposite to the hanging ear and a screw insertion hole formed through the hanging ear of both the hanging metal fittings are inserted to fix the hanging ear of both hanging metal fittings. A bolt and a nut for tightening each other, and a protrusion formed on the hanging ear portion side of the fitting portion for restricting a tightening force by the bolt and the nut within the creep limit of the insert. Anti-vibration suspension clamp characterized by. 2. An anti-slip counterbore part for detenting a nut or bolt head is formed on the outer surface side of the screw insertion hole part of the hanging ear part of the hanging fitting piece. Vibration-resistant suspension clamp described.