JPS6016041Y2 - ground rod - Google Patents

Description

[Detailed description of the invention] This invention uses a grounding rod buried underground to create an electrical path between electrical equipment, lightning arresters, lightning rods, etc. and the earth, and to discharge abnormally high voltage or lightning current to the earth. It is related to.

In general, high voltages generated in electrical circuits are discharged to the ground to prevent damage to equipment in the circuit, and high buildings are connected to metal grounding rods buried underground using conductors to protect them from lightning damage. It is known that abnormal current can be discharged into the ground, but this grounding rod is easy to drive into the soil and needs to be buried deeply.

In other words, the grounding rod is manufactured with consideration given to ensuring that the electrical connection does not become defective or disconnected when the grounding rod is driven into the ground or during handling, and that it does not come out of the ground after being buried. There must be.

Conventionally, in order to make it easier to drive the grounding rod deep into the soil, a connected grounding rod has been proposed in which the grounding rod is divided into multiple relatively short grounding rods and these are connected and driven in. A concave part is used, but the adhesion has low resistance to the pull-out side, and it is easy to come out of the ground after burial, making it impossible to reach the intended purpose, or the sharp part can be damaged during handling, making the connection difficult. There were still problems in that it had the disadvantages of weakening its strength and increasing its electrical resistance, and it was also dangerous to store and extremely difficult to handle.

The present invention accurately eliminates these conventional drawbacks, and provides a connection type grounding rod that is easy to manufacture and suitable for mass production without causing defective electrical connections, allows for simplified component parts, and is extremely inexpensive. It is intended to.

The present invention provides a connecting type grounding rod consisting of a bar-shaped metal grounding rod body 2 buried underground and having a lead wire 1 fixed thereto, and a connecting grounding rod 3 connected to the grounding rod via a connecting part. , the connecting portion comprises a fitting protrusion 4 and a hole 5;
The fitting surfaces are tapered surfaces 7° 7' through rounded surfaces 6, 6', respectively, and end with sharp ends 8, 8', so that a small (both This is a grounding rod characterized by comprising a galvanized layer 9 and a copper plated layer 10.

An embodiment of the present invention will be described with reference to the drawings. The metal grounding rod body 2 and the connecting grounding rod 3, which are made of a rod shape such as a round rod or a square rod, have a rounded tip with a rounded surface 6 so as to be easily driven into the ground.
The protrusion 4 is formed with a tapered surface 7 and a sharp end 8 through a metal plate, and a multilayer metal coating consisting of a galvanized layer 9 and a copper plated layer 10 is attached to the surface of the steel material to increase the rust prevention effect. It is.

The ground rod main body 2 has a plurality of circumferential grooves 11 near its rear end.
One end of the lead wire 1 is spot-welded to the fitting portion 12 and fixedly connected to the fitting portion 12, and a cover unit 13 molded with synthetic resin is provided around the fitting portion 12. This is to ensure and strengthen the connection of the wire 1 and the fixing of the cover unit 13 covering it to the ground rod.

These grooves or protrusions are provided in a ring shape around the entire outer circumference, and it is effective to use them singly or in combination to form a plurality of stepped portions on the outer circumference of the ground rod body 2. be.

A hole 5 into which the projection 4 is fitted is bored at the other end of the connecting ground rod 3 on the opposite side to where the projection 4 is provided.
The fitting hole has a tapered surface 7' following the rounded surface 6' and a sharp end 8', so that when the ground rod main body 2 is driven in, it is integrated in a smooth and sufficiently strong joint state. It has become.

In this case, the connecting portion consisting of the protrusion 4 and the hole 5 connects one or more of the key 14 extending in the axial direction and the key groove 15 into which the key 14 is inserted as shown in FIG. When a key 14 is provided in the hole 5, a key groove 15 is provided in the hole 5, or vice versa, or a protruding ring 16 and a ring groove 17 for fitting this protruding ring are provided in the hole 5.
It is also possible to increase the fitting strength of the connection part by providing more than -.

The integrated cover 13 is formed by molding and fixing conductive or insulating synthetic resin, and at least its outer shape is tapered into a conical shape to reduce the driving resistance of the ground rod main body 2. Both ε and the circumferential groove 1
1 is firmly fixed to the ground rod main body 2 under the condition that it is embedded in the ground rod body 2 and is mounted so as not to come off against force along the axial direction.

The conductive synthetic resin may be made by uniformly mixing conductive powder with a thermoplastic synthetic resin to have conductive properties, but if necessary, the cover unit 13 may be made of a conductive material such as metal. You can also do that.

The lead wire 1 is led out from the cover 13 along the grounding rod main body 2, covered with a protective tube 18, for example, a varnish tube or a synthetic resin tube of an appropriate length, and the bare wire portion is spot welded, laser beam or maser beam is applied. It is connected and bonded by electron beam welding using a ground rod to ensure electrical connection with the ground rod main body 2 so that it will not be cut when driving into the ground.

In the figure, 19 is a flat rear end surface for driving.

Therefore, the connecting grounding rod 3 is first thrust into the ground through its protrusion 4, and before the rear end of the hole 5 penetrates into the soil, the protrusion 4 of the connecting grounding rod 3 is inserted into the ground. Hole 5
Insert it into the hole 5, tap the rear end to make it fit, and at the same time push it in sequentially.Finally, insert the protrusion 4, which is the tip of the ground rod main body 2 to which the lead wire 1 is connected, into the hole 5 and tap the loose end surface 19 to connect. It can be driven into the ground with the parts press-fitted together.

In this case, the connection part has a rounded surface and a tapered surface, so the fit is good and tight, and the electrical resistance of the connection part is also small. Moreover, the lead wire connection part does not break or the electrical connection is poor, so it can be inserted into the soil. It is easy and safe to drive into.

In the present invention, the connecting portion of the ground rod is composed of a fitting protrusion 4 and a hole 5, and the fitting surfaces are tapered surfaces 7, 7' through rounded surfaces 6, 6', respectively, and By terminating with the sharp ends 8, 8', the durability of the entire grounding rod is greatly improved and connection with the lead wire is possible.
Moreover, even when driven into the ground, the connecting part of the grounding rod and the connection between the lead wire and the grounding rod body will not be destroyed, the electrical connection will not be defective or disconnected, and a strong connection can be maintained. It can be buried safely without interfering with the discharge action, and the connection of the grounding rod can be easily and firmly established, making it difficult for the grounding rod to come out of the ground, greatly increasing reliability, and making it easy to manufacture and handle. It is easy to use and can greatly reduce material and processing costs, is suitable for mass production, and is easy to manage.In addition, it minimizes guidance and resistance in the driving direction of the grounding rod, ensuring integration.
The grounding rod can be easily driven into the ground, and a stable and accurate grounding state can be maintained, which has practical effects.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of the separated state, FIG. 2 is a vertical sectional view of the connection part, FIG. 3 is a vertical sectional view of the lead wire connection part, and FIGS. 4 and 5. The figure is a longitudinal sectional view showing another embodiment of the connecting portion. 1...Lead wire, 2...Ground rod body,
3... Earth rod for curved connection, 4... Protrusion, 5...
... Hole, 6. Curved/Rounded surface, 7... Tapered surface, butt... Sharp end, 9... Galvanized layer, 10...・Copper plating layer, 11・Curved/circumferential groove, 1
2... Fitting part, 13... Curved cover integrated, 14...
...Key, 15...Keyway, 16...
...Protruding ring, 17...Ring groove.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A connection consisting of a bar-shaped metal grounding rod body 2 buried underground and having a lead wire 1 fixed thereto, and a connecting grounding rod 3 connected to the grounding rod via a connecting part. In the type grounding rod, the connecting portion consists of a projection 4 for fitting and a hole 5, the fitting surfaces of which are tapered through rounded surfaces 6 and 6', respectively, and are tapered surfaces 7 and 7', and are sharp. A grounding rod terminating in ends 8, 8' and comprising at least a zinc plating layer 9 and a copper plating layer 10 on the surface of said grounding rods 2, 3. 2. The ground rod according to claim 1, wherein the connecting portion has at least one key in the axial direction of the ground rod and a keyway into which the key is inserted. 3. The grounding device according to claim 1, wherein the connecting portion has a protruding ring annularly protruding in the radial direction of the grounding rod, and a ring groove into which the protruding ring is inserted. rod. 4. Utility model registration claims 1 to 4, wherein the lead wire is spot welded to the outer periphery of the ground rod body, and the welded portion is covered and fixed with a cover made of a synthetic resin mold. A grounding rod as described in any one of paragraphs 3. 5. The grounding rod main body 2 has a lead wire fixing portion with a fitting portion formed by a plurality of circumferential grooves, and has an integral conductive or insulating cover covering the fitting portion. The grounding rod according to claim 1 or 4 of the utility model registration claim.