JPH0545045Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a voltage detection grounding device that has the functions of both a voltage detection device for confirming the non-voltage state of a live part and a grounding device for performing grounding operations.

B. Overview of the invention This invention is a voltage detection grounding device that detects the voltage of a live part and then grounds it.The insulating tube with the voltage detector attached to it is removably attached near the live part, and is fitted into the live part. A grounding rod whose tip can fit into the provided ring contact is movably provided in an insulating cylinder, and a spring is provided to move and urge the grounding rod to a position where it cannot be grounded unless it is rotated and pushed in and rotated. This prevents the earthing rod from being grounded until the non-voltage condition of the live parts is confirmed with a voltage detector, thereby preventing accidental grounding while the wire is live.

C. Prior Art Conventional disconnecting sections and voltage detection grounding devices are shown in FIGS. 4 to 7. Figure 4 is a vertical side view of the disconnection section, Figure 5 is a front view of the disconnection unit, Figure 6 is a vertical side view showing the voltage detection device installed, and Figure 7 is the vertical side view showing the grounding device installed. It is a diagram.

As shown in FIGS. 4 and 5, the epoxy resin 2 serving as an insulating member covering the live part 1 is extended in the horizontal direction beyond the end of the live part 1, forming a substantially cylindrical mounting part 3. ing. The mounting part 3 is attached to pass through a partition plate 4 of the switchboard, and a ring contact 6 is fitted into a notch 5 formed in the charging part 1 inside the mounting part 3. The outer peripheral surface of the mounting portion 3 is covered with a conductive ground layer 7.

As shown in FIGS. 6 and 7, a voltage detection rod or a grounding rod is inserted into the ring contact 6 to perform voltage detection and grounding. As shown in FIG. 6, the voltage detection device 8 includes voltage detection rods 9a and 9b, a voltage detection terminal 10, an insulating handle 11, a display section 12 that displays the presence or absence of voltage at the charging part, and a voltage detection terminal 10. Electric terminal 1
0 and the display section 12, and a cylindrical guide 14 with a bottom. Handle 1
1, fit the guide 14 to the outside of the mounting part 3, and fit the voltage detection terminal 10 to the ring contact 6.
will be displayed.

As shown in FIG. 7, the grounding device 15 includes a grounding rod 16, a grounding terminal 17, and an insulating handle 1.
8, a bottomed cylindrical guide 19, and a ground terminal 17.
It consists of a lead 20 etc. that connects to the ground. By grasping the handle 18, fitting the guide 19 to the outside of the mounting portion 3, and fitting the grounding terminal 17 to the ring contact 6, the charging portion 1 is grounded via the grounding terminal 17 and the lead 20.

Therefore, the grounding operation by the grounding device 15 is required to be performed after confirming the non-voltage state of the charging unit 1 by the voltage detection device 8. This is to prevent accidents.

D. Problems to be solved by the invention However, since the voltage detection device and the grounding device are installed separately in the installation part of the disconnection section, the grounding operation may be performed in the wrong order before the voltage detection operation, resulting in an electric shock accident. There is a risk that

Therefore, an object of the present invention is to provide a voltage detection grounding device that solves such problems.

E Means for solving the problem The structure of the present invention to achieve this purpose is as follows:
A ring contact is fitted into a notch formed in the live part, and an insulating member that covers the live part is made to protrude from around the ring contact in a substantially cylindrical shape to form a mounting part,
In a voltage detection grounding device that is attached to an attachment part to detect voltage and ground a live part, an insulating tube is provided inside the attachment section in a removable manner, and when the insulation tube is attached, the insulating tube protrudes outside the attachment section. A voltage detector is attached to the outside, and a voltage detection terminal that comes into contact with the ring contact when the insulating tube is installed is provided at the tip of the insulating tube to connect to the voltage detector, and a grounding rod that is movable along the axis is installed inside the insulating tube. The tip of the grounding rod is formed to be able to fit into and detach from the ring contact, and the vicinity of the base end is grounded via a cable, and an insulating handle is provided at the base end, and the outer periphery of the grounding rods facing each other is connected to the ring contact. A guide pin is formed on one side of the surface and the inner peripheral surface of the insulating cylinder, and a groove for guiding the guide pin is formed on the other side in a substantially L-shape along the axis and the circumferential direction. A spring is provided between the rod and the insulating cylinder to urge the ground rod toward the handle and to rotate the ground rod so that the guide pin moves to the end of the groove extending in the circumferential direction. Features.

F Effect When the voltage detection grounding device is attached to the attachment part of the disconnection section,
The voltage detection terminal contacts the ring contact, and a voltage detector connected to the ring contact via a lead indicates the presence or absence of voltage in the live part.

After confirming that there is no voltage on the live part, grasp the handle and rotate the grounding rod against the biasing force of the spring, then push out the grounding rod against the biasing force of the spring. At this time, the guide pin formed on either the outer circumferential surface of the ground rod or the inner circumferential surface of the insulating tube moves circumferentially along the groove formed on the other, and then moves along the axis. I will do it.
As a result, the connection terminal fits into the ring contact, and the live part is grounded via the ring contact, the grounding rod, and the cable. When the grounding terminal and the ring contact are uncoupled, the grounding rod is moved toward the handle by the biasing force of the spring, and further rotated by the biasing force of the spring to return to its original position.

G. Embodiments Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

Figure 1 shows an example of the voltage detection grounding device according to the present invention.
It is shown in Figure 3. As shown in the figure, a head insulating tube 25 is detachably attached to the mounting portion 3, and a tail insulating tube 28 is coupled to the head insulating tube 25 via a plurality of bolts 26 and nuts 27. A voltage detector 29 is attached to the outside of the tail insulating tube 28 that protrudes outside the mounting section 3 when the head insulating tube 25 is attached to the mounting section 3. A voltage detecting terminal 30 is provided at the tip of the head insulating tube 25, and the voltage detecting terminal 30 contacts the ring contact 6 when attached to the mounting part 3. If there is, it is connected to a voltage detector 29 that displays with sound and light.

Inside the head insulating tube 25 and the tail insulating tube 28,
A grounding rod 35 is provided movably along the axis. The grounding rod 35 connects the relay hand 36 and the relay hand 36.
a grounding terminal 38 which is attached to the tip of the ring contact 6 and has a large diameter portion 37 and which is formed to have an outer diameter so that it can be freely inserted into and removed from the ring contact 6; and an insulating handle 39 attached to the base end of the relay arm 36. It consists of The connecting portion between the connecting handle 36 and the handle 39 is such that the connecting part 3 is inserted into the fitting hole 40 formed in the handle 39.
6, and insert the connecting hand 3 along the L-shaped slit 42 formed in the handle 39.
6 so that the pin 43 formed in the handle 39 moves.
This configuration rotates and connects the two. Two sets of the slit 42 and the pin 43 are provided at opposite positions with respect to the axis of the grounding rod 35. Intermediate 3
Cable 44 and grounding fitting 45 near the base end of 6
is grounded through.

A large diameter portion 36a is formed at an intermediate position of the connecting arm 36, and a guide pin 46 protrudes from the large diameter portion 36a. On the other hand, on the inner circumferential surface of the tail insulating tube 28, there is a groove 47a extending along the axis, and a groove formed at the left end of the tail insulating tube 28 in FIG. 47b to form a substantially L-shaped groove 47. A guide pin 46 is guided by this groove 47, and the guide pin 46 is guided by the L-shaped groove 47.
A spring 48 that biases the grounding rod 36 so that the guide pin 46 moves to the position P in FIG. 25a. The spring 48 not only biases the ground rod 36 in the direction along the axis, but also in the circumferential direction, so both ends thereof are fixed to the large diameter portion 36a and the small diameter portion 25a.

Next, the operation of such a voltage detection grounding device will be explained.

As shown in FIG. 3b, the voltage detection grounding device in which the relay arm 36 and the handle 39 are combined is mounted on the mounting portion 3 as shown in FIG. 1. At this time, the grounding terminal 38 is at the position shown by the imaginary line in FIG.
When there is voltage in the charging section 1, the voltage detector 29 operates and displays the display with sound and light. After confirming that there is no voltage in the charging part 1, grasp the handle 39 and move the grounding rod 35 counterclockwise against the biasing force of the spring 48.
When the guide pin 46 moves from position P to position Q in FIG. 2 by rotating 90 degrees, push the ground rod 36 against the biasing force of the spring 48 until the ground terminal 38 fits into the ring contact 6. . Since a frictional force acts between the ring contact 6 and the ground terminal 38, the ground terminal 38 will not come off from the ring contact 6 even if the handle 39 is released.

When the grounding operation is completed and the grounding terminal 38 is pulled out from the ring contact 6, the grounding rod 35 moves to the left in FIG. 1 due to the biasing force of the spring 48, and the large diameter part 37 hits the small diameter part 25a and stops. Thereafter, the grounding rod 35 is rotated clockwise in FIG. 2 by the urging force of the spring 48 in the rotational direction. That is, the guide pin 46 moves in the groove 47a from right to left in FIG. 1, and then moves in the groove 47b from the position Q to the position P (the terminal end of the groove 47).

When the ground terminal 38 is not fitted into the ring contact 6, the guide pin 46 always returns to the position P in FIG. 2 due to the biasing force of the spring 48, and the ground rod 35 is intentionally rotated 90 degrees. Grounding operation is not possible unless you do so.

In this embodiment, a guide pin is provided on the ground rod and a substantially L-shaped groove is formed in the insulating tube, but the guide pin may be provided in the insulating tube and the groove is provided in the ground rod.

H. Effects of the invention As explained above, according to the voltage detecting grounding device according to the present invention, voltage detection is performed at the same time as the voltage detecting grounding device is attached to the attachment part, and the grounding operation cannot be performed unless the grounding rod is rotated and pushed in. Since this is not possible, voltage detection must be performed before grounding. Therefore, unlike in the past, there is no possibility that the grounding operation is performed before the voltage detection due to an incorrect operating procedure by the worker, and no electric shock accidents occur.

Further, since the voltage detection grounding device has an integrated structure, it is compact and convenient for voltage detection grounding work and portability.

[Brief explanation of the drawing]

Figures 1 to 3 relate to an embodiment of the voltage detection grounding device according to the present invention, in which Figure 1 is a cross-sectional view, Figure 2 is a view taken in the direction of the - arrow in Figure 1, and Figure 3a is a front view in the grounded state. figure,
Fig. 3b is a plan view of the non-grounded state, Figs. 4 and 5 relate to the disconnection section, Fig. 4 is a longitudinal side view, Fig. 5 is a front view, and Fig. 6 is a conventional voltage detection device. FIG. 7 is a vertical side view showing the conventional grounding device in the installed state. 1... Live part, 2... Epoxy resin, 3... Mounting part, 5... Notch part, 6... Ring contact,
25...Head insulating tube, 28...Tail insulating tube, 29
...Voltage detector, 30... Voltage detection terminal, 35... Grounding rod, 38... Grounding terminal, 39... Handle, 44...
Cable, 46... Guide pin, 47... Groove, 4
8...Spring.

Claims (1)

[Scope of Claim for Utility Model Registration] A ring contact is fitted into a notch formed in a live part, an insulating member that covers the live part is protruded from around the ring contact in a substantially cylindrical shape to form a mounting part, and the mounting part is mounted. In a voltage detection grounding device that is attached to a part to detect voltage and ground a live part, a removable insulating tube is provided inside the attached part, and when the insulating tube is attached, the outside of the insulating tube protrudes outside the attached part. A voltage detector is attached to the insulating tube, and a voltage detecting terminal that comes into contact with the ring contact when the insulating tube is attached is provided at the tip of the insulating tube and connected to the voltage detector, and a grounding rod that is movable along the axis is installed inside the insulating tube. The tip of the grounding rod is formed to be able to be fitted and removed into a ring contact, and the vicinity of the base end is grounded via a cable, and an insulating handle is provided at the base end, and the outer circumferential surfaces of the grounding rods facing each other are provided. A guide pin is formed on one side of the inner peripheral surface of the insulating cylinder, and a groove for guiding the guide pin is formed on the other side in a substantially L-shape along the axis and the circumferential direction. A spring is provided between the rod and the insulating cylinder to urge the ground rod toward the handle and to rotate the ground rod so that the guide pin moves to the end of the groove extending in the circumferential direction. Characteristic voltage detection grounding device.