JPH0510796B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mounting tool for a ground connector that is mounted to, for example, the body of a tank truck as a grounded object.

[Conventional technology]

These tank trucks are primarily used to transport flammable and dangerous substances such as gasoline, but when refueling and discharging at oil depots and filling stations, for example, there is a risk of gasoline igniting and causing a fire or other danger. In order to prevent this, a ground wire is connected to the body of the tank truck to remove static electricity from the body.

By the way, the ground connector used to connect the ground wire in this way connects a conductor for testing in addition to the ground wire, and detects this in the middle, in order to confirm whether the ground is functioning reliably. It involves intervening means. Then, a weak current is passed through the conductor wires to detect the presence or absence of a closed circuit formed between the two conductor wires when connected to earth.

On the other hand, the shape of the contact part for the ground connector provided on the body of the tank truck differs depending on the vehicle model, so the ground connector of the contact part that matches the model of tank truck that is used most often is used.

For this reason, when supplying and discharging fuel to a tank truck that does not match the ground connector used at the oil depot or service station, a separate connection fitting is attached to the appropriate location on the body of the tank truck.

By the way, as shown in FIG. 3, the conventional fixture has contact parts 22a, 22 on the top surface of a main body 21 having an L-shaped cross section for contacting with an earth connector 7, which will be described later.
b, and a contact piece 23, which is one fixed contact member of the clamping structure, is integrally protruded from an arbitrary location on the lower surface,
A screw 24, which is the other fixed contact member for clamping, is attached to the side surface, and an appropriate protrusion 6a of the tank truck body 6 is clamped between this contact piece 23 and the end of the screw 24.

The main body 21, contact parts 22a, 22 of these fixtures
b, the contact piece 23, and the screw 24 are all made of a conductor, that is, metal, and the main body 21 is further made of a magnetic material such as iron.

In addition, 7 in the figure is a ground connector also used in the present invention, which connects two contact bodies 10a and 10b to the bottom surface of the main body 7a with springs 9a and 9b, respectively.
Connect the conductive wire 8a for inspection and the ground wire 8b to the springs 9a and 9b, respectively, and connect the contact body 10a, the spring 9a and the contact body 10b, and the lower surface of the spring 9b to the same body as the main body 7a. A permanent magnet 11 for connection holding is attached so as to be positioned on a flat surface.

In order to ground the vehicle body 6 of a tank truck using the earth connector 7 and the fixture configured as described above, the fixture is clamped to a suitable protrusion 6a formed on the vehicle body 6, and then the ground connector 7 is grounded. The permanent magnet 11 is magnetically attached to the fixture body 1 with the contact bodies 10a, 10b of the connector 7 facing the contact portions 22a, 22b of the fixture. In this way, a weak current is passed through the conducting wire 8a, and the return of the signal from the other grounding wire 8b is detected, and it is determined that the grounding function is normal, after which oil is supplied and drained. In addition,
In this case, it is also possible to use the conducting wire 8a and the ground wire 8b in reverse.

[Problem that the invention seeks to solve]

However, with conventional fixtures configured in this way,
The weak current flows from the conductor 8a of the earth connector 7, the spring 9a, and the contact body 10a to the contact part 22a on the fixture side.
The flow then passes through the fixture body 21 and from the other contact portion 22b to the contact body 10 of the earth connector 7.
b, then to the spring 9b and the ground wire 8b, so if the protrusion 6a of the car body 6 to which the attachment is attached is coated with thick paint, or the attachment is installed incorrectly, contact may occur. Even if the piece 23 and the screw 24 are not electrically connected to the protrusion 6a and the ground connector 7 and the vehicle body 6 are not electrically electrically connected, a weak current circuit will be formed. For this reason, even when the grounding function is not actually working, it is mistakenly determined that it is normal, and oil supply and drainage are carried out with the grounding faulty, which is dangerous.

To avoid such inconveniences, it may be necessary to select a mounting location for the fixture and to change the mounting location many times, which is a troublesome task.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
For example, no matter where the earthed object is installed on the body of a tank truck, there is complete continuity between the body and the attachment, making it possible to accurately judge whether the earthing function is being performed. It is an object of the present invention to provide a safe mounting fixture for a ground connector, since the ground connector is securely attached to the fixture and there is no possibility of it coming off even when supplying and draining oil.

[Means for solving problems]

In order to achieve the above object, the earth connector fixture of the present invention has two parts for connecting the earth connector.
In a fixture for a ground connector that has two contact parts and a fixed contact member that is clamped to the grounded object, two pins each having the contact parts are buried in the conductive fixture body, and either one of the pins is embedded in the conductive fixture body. The pin is attached with an insulator to be insulated from the main body, and a conductive contact piece as a fixed contact member is integrally provided from the insulated and attached pin, and on the other hand,
The gist is that a screw for mounting as another fixed contact member is attached to the main body by penetrating the main body in a direction perpendicular to the contact piece so that the earthed body can be clamped.

[Effect]

According to the present invention, when the ground connector and the fixture are connected, the current flowing from the test conductor in the ground connector to the fixture will never reach the other contact point unless it passes through a part of the tank truck body. Care must be taken to ensure that it does not flow.

Further, since a part of the tank truck body is clamped from both sides by the contact piece of the fixture and the screw, the fixture is securely attached to the grounded body and is safe.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, with reference to the case where the earthed object is a tank truck.

Fig. 1 is a partially cutaway front view of the earth connector fitting of the present invention, and Fig. 2 is a front view showing the state in which it is used in a tank truck. The main body 1 has two pins 2c and 2d embedded therein having contact portions 2a and 2b for contacting with an earth connector 7, which will be described later.
In the illustrated example, the pin 2d has its lower end slightly protruding from the lower surface of the main body 1, and is attached to the main body 1 with an insulator 5 attached to its circumferential surface to be insulated from this, and is integrally fixed thereto from the lower end of the pin 2d. A conductive contact piece 3 as a contact member was provided protrudingly.

Further, a mounting screw 4 is attached to the side of the main body 1 as the other fixed contact member by passing through the main body 1.

In this way, the pin 2c and the screw 4 are electrically connected to the main body 1, but the pin 2d is not electrically connected to the main body 1, and furthermore, the contact piece 3 is attached to the main body 1 so that it is electrically connected only to the pin 2d, and the contact piece 3 and the screw 4 and 4 are attached in a perpendicular positional relationship so that the protrusion 6a of the tank truck body 6 can be sandwiched between the two.

Reference numeral 7 in the figure denotes a ground connector, and the structure of the ground connector 7 is the same as that used in the conventional example, so the same reference numerals are given and detailed explanation is omitted.

Each end of the inspection conductor 8a and the ground wire 8b of this ground connector 7 is connected to the oil supply/drainage control device 13.
Further, the middle of the ground wire 8b is connected to the ground rod 12.

The oil supply and discharge control device 13 controls the supply and discharge of oil to the tank truck, and is connected to a conductor 8.
a. A function is provided to detect the presence or absence of a closed circuit formed in the ground wire 8b.

Next, to explain its usage and operation:
For example, when refueling a tank lorry, in order to first remove static electricity from the tank lorry body 6, select an appropriate protrusion 6a from among the protrusions formed on the body 6, and bring the protrusion 6a into contact with the tank lorry. When the protrusion 6a is placed between the piece 3 and the screw 4, brought into contact with the contact piece 3, and the screw 4 is tightened, the protrusion 6a is held between the contact piece 3 and the screw 4, and the mounting tool is attached to the vehicle body 6.

Therefore, the contact body 10a of the earth connector 7,
Permanent magnet 1 with 10b facing contact parts 2a and 2b
1 to the fixture body 1, the contact parts 2a, 2
The earth connector 7 and the fixture are connected in a state where the contact members 10a and 10b are pressed by the contact members 10a and 10b. At this time, contact between the contact bodies 10a, 10b and the contact portions 2a, 2b is ensured by the elasticity of the springs 9a, 9b.

Next, when a weak current is passed through the inspection conductor 8a by the oil supply/drainage control device 13, this current flows through the contact body 10.
a, the contact part 2a, the fixture body 1 via the pin 2c
Then, it flows through the screw 4, the protrusion 6a of the tank truck body 6, and further flows through the contact piece 3, the other pin 2d, the contact part 2b, and from the other contact body 10b to the conductor 8b, A closed circuit is formed here.

If the oil supply/discharge control device 13 detects the current and confirms the formation of a closed circuit, and determines that the grounding function is normal, a control signal from the oil supply/discharge control device 13 makes it possible to refuel, and Static electricity on the vehicle body 6 is grounded from the ground wire 8b via the ground rod 12.

At this time, if the attachment method to the vehicle body 6 is not appropriate and the attachment and the vehicle body 6 are not grounded due to poor contact, there is an insulator 5, so a short circuit within the attachment will definitely not occur. Therefore, the formation of a closed circuit is not detected by the oil supply/drainage control device 13, and therefore oil supply is not possible.

When draining oil from a tank truck into an underground tank of a gas station, the operation is similar to the above-mentioned refueling case.

〔Effect of the invention〕

As described above, the earth connector fitting of the present invention has two contact parts for contacting the earth connector and a fixed contact member that is clamped to the earthed object. Because the weak current always flows through the earthed object, such as the body of a tank truck, no special operations are required, and the mounting bracket can be securely attached no matter what shape the earthed object is attached to. The device can be attached to the ground and can accurately make ground confirmation judgments, prevent dangers caused by erroneous judgments, ensure safety without the risk of the fitting coming off after inspection, and has a simple structure.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of the earth connector fitting of the present invention, Fig. 2 is a front view showing the state in which it is used in a tank truck, and Fig. 3 is a partially cutaway front view showing a conventional example. . 1... Fixture main body, 2a, 2b... Contact part, 2
c, 2d...pin, 3...contact piece, 4...screw,
5... Insulator, 6... Tank truck body, 6a
...Protrusion, 7...Earth connector, 7a...Earth connector body, 8a...Inspection lead wire, 8b
...Ground wire, 9a, 9b...Spring, 10a, 1
0b...Contact body, 11...Permanent magnet, 12...Earth rod, 13...Oil supply/drainage control device, 21...Mounting tool body, 22a, 22b...Contact portion, 23...Contact piece, 24... …screw.

Claims (1)

[Claims] 1. Two contact parts for contacting the earth connector,
In a fixture for a ground connector that has a fixed contact member that is clamped to a grounded object, two pins each having the contact portion are embedded in the conductive fixture body, and one of the pins is equipped with an insulator. A conductive contact piece as a fixed contact member is integrally provided from this insulated and mounted pin, and a conductive contact piece as a fixed contact member is mounted on the main body as another fixed contact member. A mounting tool for an earth connector, characterized in that the screw is attached by passing through the main body in a direction perpendicular to the contact piece so that the earthed object can be clamped.