JP5415845B2 - Wire retention clamp - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire retaining clamp used for retaining an electric wire on a support such as an electric pole, and more particularly, an electric wire retaining clamp for low-voltage power distribution provided with a hanger for connecting to an insulator of an electric pole. It is about.

In the field of power distribution for power supply, a retention clamp is used to retain an electric wire on a support such as a utility pole. The wire retention clamp shown as an example in FIG. This is a wedge-type electric wire retaining clamp 100.
The wire retaining clamp 100 is inserted into the wire gripping groove 5 to clamp the wire in cooperation with the clamp body 1 having a U-shaped cross section in which the wire gripping groove 5 for inserting and gripping the wire is formed. And a wedge member 2.
This wedge member 2 is connected and retained to a pole fitting or the like of a utility pole by a U-shaped hanger rod 4 whose appearance is connected to a hanger rod holder 3.

  In the wire holding clamp for low-voltage electric wires as in the present invention, as a document disclosing the technology related to the insulating portion of the hanger for connecting to the insulator metal fitting of the utility pole, for example, there is the following patent publication: In these documents 1 and 2, a hanger rod portion coated with vinyl chloride is described.

JP 11-178179 A (Daido Electric Industry Co., Ltd.) JP-A-10-126931 (Asahi Electric)

In the conventional low-voltage wire tension clamp, the insulation of the hanger is covered with vinyl chloride. The manufacturing method is that a plasticizer is mixed with powdered vinyl chloride to make it flowable, and is attached to the mandrel, and the plasticizer is mixed with vinyl chloride by raising the temperature above the melting point of the vinyl chloride. A vinyl chloride layer is formed on the mandrel below the melting point.
However, vinyl chloride contains chlorine, and there is concern that harmful substances may be released if the procedure is mistaken at the time of disposal.
In addition, the plasticizer mixed with the vinyl chloride is an environmental hormone substance that adversely affects the inside of the human body, and if it enters the body by mistake, there is a concern about the influence on the human body.

  The wire retention clamp according to the present invention is made to solve the above-described problems, and the hanger insulating portion of the hanger rod is made of a material that does not adversely affect the environment and the human body. An object of the present invention is to provide a manufacturing means capable of providing a stable quality at a low cost.

(1) "Clamp main body-wedge member -rod holder-hanger rod" is integrally connected, and is an electric wire retaining clamp for holding an electric wire on a support,
The clamp body has a U-shaped cross section, and an electric wire gripping groove is formed therein,
The wedge member has a wedge part having an electric wire holding groove for holding an electric wire between the electric wire holding groove of the clamp body and an anchoring part connected to a rod holding body for holding the hanger rod. And
The hanger rod is U-shaped, and has two connecting portions on the end side connected to the rod holder, a curved portion connected to the support-side member, and a linear portion between them. And
The predetermined location including the curved portion of the hanger rod is set as a hanger insulating portion,
The hanger insulation is covered with a polyethylene material,
And the said hanger rod is formed so that a linear material may be U-shaped and has the above-mentioned curved part,
The wire retaining clamp according to claim 1, wherein the covering of the polyethylene material on the hanger insulating portion is formed on the linear material by injection molding means before the linear material is made U-shaped.

  Even when manufacturing hanger insulation parts, we changed the hanger insulation parts of wire hanger rod hanger rods from conventional environmentally hazardous substances such as vinyl chloride to the use of environmentally friendly substances that do not adversely affect the human body. In a user-friendly environment, low-cost and stable quality products can be supplied.

It is a side view of the electric wire retention clamp by this invention. It is a reverse view of the electric wire retention clamp of FIG. FIG. 2 is a left side view of the electric wire retaining clamp of FIG. 1. It is a side view of the connection pin of the electric wire retention clamp of FIG. It is a figure which shows the state which the electric wire retention clamp of FIG. It is a figure which shows the structure of the hanger rod by this invention.

  1-6 is a view showing an embodiment of an electric wire retaining clamp of the present invention, FIG. 1 is a side view of an electric wire retaining clamp 100 according to the present invention, and FIG. 2 is a back view (back view) of FIG. 3 is a side view of FIG. 1 viewed from the left side, and the retaining clamp 100 according to the present invention includes a clamp body 1, a wedge member 2, a hanger rod holder 3, and a hanger having a U-shaped appearance. A rod 4 is provided.

As shown in FIG. 3, the clamp body 1 is manufactured by molding a lightweight aluminum alloy into an inverted U-shaped cross section, and an electric wire gripping groove 5 is formed inside.
As shown in FIG. 1 and FIG. 3, shoulders 5 a are formed on both sides of the lower portion of the wire gripping groove 5 so as to be in pressure contact with the stepped portion 2 a of the lower surface of the wedge member 2, and the upper surface 5 b of the wire gripping groove 5 is The cross section is semicircular so as to abut against and grip the electric wire from the outer periphery.
A projection 7 for driving into the wedge member 2 by a hammer is formed at one end of the top of the clamp body 1.

  The wedge member 2 includes a wedge portion 8 and an integral retaining portion 10 continuous to the wedge portion 8, and as shown in FIG. 3, the wedge portion 8 includes a central flat lower surface 2b between the step portions 2a, A curved upper surface 2c that matches the outer shape of the cross section of the electric wire, and as shown in FIG. 1, the central flat lower surface 2b between the stepped portions 2a is configured to be inclined to the lower left.

  Further, the retaining portion 10 of the wedge member 2 protrudes downward from the base portion of the wedge portion 8, and a retaining hole 11 penetrating in the lateral direction (horizontal direction) perpendicular to the longitudinal direction of the electric wire is formed in the upper portion. A screw pin 12 is inserted into the retaining hole 11 in order to prevent the clamp body 1 from coming out in the right direction in FIG.

The clamp body 1 can be fitted to the wedge portion 8 from the thin portion at the right end of the wedge portion 8 in FIG. 1 to the left, but the upper surface of the thick portion on the left side of the wedge member 2 is eventually clamped. Since it touches the inner walls on both sides of the groove 5, it cannot move further to the left.
On the other hand, since the clamp body 1 can move freely to the right, after inserting an electric wire between the clamp body 1 and the wedge portion 8, the clamp pin 12 is inserted into the retaining hole 11, whereby the clamp body 1 and the wedge part 8 are restricted from moving to the left and right by the barb pin 12 and cannot be detached from the electric wire.

Further, a joint hole 13 into which the distal end portion of the connecting pin 15 can be inserted is formed in the retaining portion 10 of the wedge member 2 described above, and the outside is a cylindrical portion 14 for compression and fixation.
The hanger rod holder 3 is a horizontally long member as shown in FIG. 2 and is formed with a through-hole through which the connecting pin 15 can freely rotate. Since the head 15 a is provided, the connecting pin 15 does not come out of the hanger rod holder 3.

As shown in FIG. 4, a number of annular retaining teeth 15b are formed at the tip of the connecting pin 15, but each annular retaining tooth 15b has an acute angle in the retaining direction as shown. Even if an attempt is made to substitute a screw thread, the screw thread cannot be used because there is a risk that it will come off if a rotational force is applied to the connecting pin 15.
The distal end portion of the connecting pin 15 on which the annular retaining teeth 15b are formed is inserted into the joint hole 13 of the retaining portion 10, and then the cylindrical portion 14 is compressed into a polygonal shape, for example, a hexagonal cross section. When the inner wall is bitten into the annular retaining teeth 15b, the connecting pin 15 is firmly fixed to the retaining portion 10.

The hanger rod holder 3 has rod holes 17 on both sides, and each rod hole 17 has a thin cut 18 on each side thereof. The width of the cut 18 is smaller than the diameter of the rod hole 17. .
The hanger rod 4 is formed by bending a metal rod into a U-shape, and a hanger insulating portion covered with an insulating material is formed in a substantial portion of the center except for both ends.

Further, the hanger rod 4 has a head 21 and a circular cross-sectional portion 22 following the head 21 at both left ends bent in a U shape.
The circular cross section 22 of the hanger rod 4 has a diameter smaller than the diameter of the head 21 and has a diameter that allows the hanger rod holder 3 to be slidably fitted to the rod hole 17. The subsequent thin-walled portion 23 is fitted to the rod hole 17 by passing through the cut 18.

  Here, since the hanger rod 4 needs to be supported rotatably with respect to the clamp body 1 and the wedge member 2, the hanger rod holder 3 is connected to the wedge member 2 by a connecting pin 15 a penetrating therethrough. The tip of the connecting pin 15a is driven into the cylindrical portion 14 and connected to the wedge member 2, and the hanger rod holder 3 and the wedge member 2 are connected and connected so as not to come off. The

In order to hold the electric wire on the electric pole or the like using the electric wire retaining clamp 100 according to the present invention, the clamp body 1 and the wedge member 2 are separated, and the hanger rod 4 is fixed to the electric pole 24 as shown in FIG. What is necessary is just to attach to the insulator 25 and to connect the wedge member 2 to a utility pole.
Next, the stranded wire conductor W from which the insulation coating of the electric wire has been removed is engaged in the electric wire gripping groove 5 of the clamp body 1, and the clamp body 1 is moved to the wedge portion 8 of the wedge member 2 to the right as shown in FIG. Fit more. In this state, when the screw pin 12 can be inserted into the retaining hole 11, the clamp body 1 and the wedge member 2 are not separated from the electric wire and disassembled, and an inadvertent drop during work can be prevented.
Subsequently, the right surface of the protrusion 7 of the clamp body 1 is hit with a hammer, and the stranded conductor W is fixed between the wedge portion 8. Finally, the pin 12 is inserted into the retaining hole 11 to prevent the clamp body 1 from coming off, whereby the retaining operation is completed and the completion of the operation can be confirmed.

  Then, when the holding work by the wire holding clamp is completed as shown in FIG. 5, the clamp body 1 of the wire holding clamp 100 is finally covered with an insulating cover. At this time, the hanger rod A portion on the drawing side 4 is exposed from the insulating cover. What hides many of the exposed charged parts is the hanger insulating part of the hanger rod 4, and the purpose is to provide the hanger rod 4 with an insulating part (insulating layer).

In this invention, the hanger insulation part 42 of the hanger rod 40 is comprised with the polyethylene material in the electric wire retention clamp.
FIG. 6 is a diagram showing the hanger insulating portion 42 made of polyethylene, and the hanger rod 40 has a mandrel 41 as a base body (central body) and a polyethylene layer 42 formed as an outer peripheral layer thereof.

As the mandrel 41 of the hanger rod 40, a SUS material or the like is used, and a linear member composed of heads (t1, t2) at both ends and a linear linear part 41A is formed in an elongated rod shape with a circular cross section. The
The head (t1, t2) is larger than the cross-sectional diameter of the linear portion 41A and protrudes from the linear body to the outer peripheral side, and has an appropriate shape such as a spherical cutout shape or a thin rectangular parallelepiped. Formed.
The hanger rod 40 having the hanger insulating portion 42 is formed in a U-shaped appearance as a whole, and when the head (t1, t2) is locked to the rod holder 3, the hanger rod 40 and the rod The holding body 3 forms a connection connection.
Moreover, it is preferable to ensure that the thickness of the outer peripheral layer of the hanger insulating part 42 is 1 mm or more when the outer diameter of the linear part 41A of the mandrel 41 is about 5 mm.

In the present invention, in the hanger rod 40 of the wire retaining clamp, the hanger insulating portion 42 made of polyethylene material is formed as the outer peripheral layer, and is formed on the outer periphery of the mandrel 41 using a machine equipped with injection molding means. Is preferred.
The injection molding machine (injection molding means) of the present invention melts a material by heating a polyethylene material, injects it into a mold by applying a high pressure to the dissolved material, and cools the material by cooling after injection. This is a facility for producing a solid product.
In the present invention, molding is employed in which a core 41 is set in the molding die before injection molding, injection molding is performed, and a PE layer is formed on the outer periphery of the core to obtain a product.
As a result, in the present invention, unlike conventional PVC dipping, molding is performed under a constant pressure, so that a product having a uniform thick PE layer can be obtained efficiently.

DESCRIPTION OF SYMBOLS 1 Clamp body 2 Wedge member 2a Step part 2b Center flat bottom surface 2c Curved top surface 3 Hanger rod holder 4 Hanger rod 5 Wire grip groove (clamp groove) of clamp body 1
5a shoulder 5b upper surface (with sawtooth ridge)
7 Protrusion for Driving 8 Wedge Part of Wedge Member 2 10 Retention Part of Wedge Member 2 12 Squeeze Pin 13 Joint Hole 14 Cylindrical Part 15 Connecting Pin 15a Round Head 15b Annular Retaining Teeth 17 Rod Hole 18 Cut 21 Head 22 Circular Section 23 Thin-walled section 24 Telephone pole (support)
25 insulator W stranded wire conductor 40 hanger rod 41 mandrel (central body)
41A Linear part of the mandrel 41 t1, t2 Heads at both ends of the mandrel 41 (t1, t2)
42 Hanger insulation (polyethylene layer, outer layer)

Claims (1)

"Clamp body-wedge member -rod holder-hanger rod" is integrally connected, and is an electric wire retaining clamp for holding an electric wire on a support,
The clamp body has a U-shaped cross section, and an electric wire gripping groove is formed therein,
The wedge member has a wedge part having an electric wire holding groove for holding an electric wire between the electric wire holding groove of the clamp body and an anchoring part connected to a rod holding body for holding the hanger rod. And
The hanger rod is U-shaped, and has two connecting portions on the end side connected to the rod holder, a curved portion connected to the support-side member, and a linear portion between them. And
The predetermined location including the curved portion of the hanger rod is set as a hanger insulating portion,
The hanger insulation is covered with a polyethylene material,
And the said hanger rod is formed so that a linear material may be U-shaped and has the above-mentioned curved part,
The wire retaining clamp according to claim 1, wherein the covering of the polyethylene material on the hanger insulating portion is formed on the linear material by injection molding means before the linear material is made U-shaped.

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