JP2003077557A - Grounding terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem wherein a terminal sometimes falls from a bottom plate due to advancing of rust with the lapse of time, when the terminal is only welded on the bottom plate. SOLUTION: The terminal 15 having a female screw 15 for connecting a cable by screwing a bolt for a right screw is connected to the bottom plate 12 by screwing by a left screw and is connected by welding by a welding part 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground terminal and prevents the terminal from falling off from a ground member.

[0002]

2. Description of the Related Art A plurality of circuit breakers are installed in a distribution line of a substation or the like for maintenance, inspection, and repair, and a control device for individually remote controlling each circuit breaker and each control device are provided. And a control device for remotely controlling the devices collectively. The latter is called the remote control station device, and the former is called the remote control station device.

FIG. 2 shows the configuration of the remote control station device. In the figure, 1 is a remote control station device, 2 is a light-shielding cover, 3 is a ventilation hole,
4 is a door that opens and closes via a hinge 5, 6 is a power connector,
Reference numeral 7 is a control connector, 8 is a communication connector, 9 is a sensor connector, 10 is an external setting device connector, and 11 is a ground terminal.

The structure of the ground terminal 11 is shown in FIG. The ground terminal 11 is formed by welding a cylindrical terminal 11 a to the bottom plate 12 and forming female threads 11 b on the terminal 11 a and the bottom plate 12. Since SUS304 is used for the bottom plate 12, SUS304 is also used for the terminal 11a and is joined by argon welding. 11c is a welded part.

The grounding of the ground terminal 11 is carried out by screwing the bolt 13 shown in FIG.

[0006]

However, the heat of welding changes the characteristics of SUS304, and SUS304 is likely to rust even if it is painted. Also, when the bolt is tightened, due to the characteristics of SUS304,
The thread of the bolt is damaged and it is easy to bite, and the bolt and the terminal are fixed. Due to this adhesion and rust, rust may progress with the passage of time and the terminal may drop off from the bottom plate.

Therefore, an object of the present invention is to provide a ground terminal that solves the above problems.

[0008]

The structure of the grounding terminal for achieving the above object is as follows.
A left male thread is formed on one end of the terminal, and a left female thread is formed on the ground member, and the left male thread is screwed onto the left female thread and welded.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the ground terminal according to the present invention will be described below.

As shown in FIG. 1, the bottom plate (ground member) 12
On the other hand, a left-handed female thread 12a is formed on one side, while a left-handed male thread 17 is formed on one end of the terminal 15, and the male thread 17 is screwed onto the female thread 12a. On the outer peripheral surface at the other end of the terminal 15, three pairs of mutually parallel planes are provided to form a hexagonal head portion 16. A right-handed female thread 15a is formed at the axial center of the terminal 15. For reinforcement, the terminal 15 and the bottom plate 12 are welded together, and a welded portion 18 is provided.

Next, the operation of the ground terminal will be described. To connect the cable to the ground terminal 14, use the bolt 1 in FIG.
3 is screwed into the female screw 15a. When the bolt 13 is strongly turned to the right at the final stage of tightening the female screw 15a, the left screw terminal 15 is turned to the right and the terminal 1
Five tries to relax. However, since the terminal 15 and the bottom plate 12 are connected via the welded portion 18, the terminal 15 does not loosen.

On the contrary, to remove the cable from the terminal 15,
It is sufficient to turn the bolt 13 to the left. At this time, the terminal 15
However, since the male screw 17 is a left screw, the terminal 15 is rotated in the tightening direction, and no force acts in the direction in which the terminal 15 is separated from the bottom plate 12. That is, even after a long time has passed, the bolt 13 and the terminal 15 are rusted and the bolt 13 tries to rotate together with the terminal 15, and even if the joint force between the bottom plate 12 and the terminal 15 due to the welded portion 18 is weakened by the rust. Since a force in the tightening direction is applied to the terminals 15, there is no risk that the terminals 15 will fall off the bottom plate 12.

As described above, while the terminal 15 is tightened when the bolt 13 is loosened, when the bolt 13 is tightened, a force is applied to the terminal 15 in a loosening direction, so that the terminal 15 is held so as not to loosen by welding. become.
As described above, it is troublesome to weld the bolts 13 so as not to loosen them when tightening the bolts 13. However, when the bolts 13 and the terminals 15 are rusted and torque is applied to the terminals 15 when the bolts 13 are loosened, the terminals 15 are not rotated. Since it can be surely prevented from being separated from the bottom plate 12, such a configuration is intentionally adopted.

It should be noted that a pair of flat surfaces substantially parallel to each other may be formed on the other end of the terminal only in one set, or two sets may be formed in a square pole. Further, the right screw formed on the terminal is not limited to the female screw, and the nut can be screwed in by using the male screw.

[0015]

As is apparent from the above description, claim 1
According to the grounding terminal of the above, since the terminal having the right screw is screwed to the grounding member by the left screw, the bolt is screwed into the right screw of the terminal and the cable is connected to the terminal. Even if it rusts, the terminal that tries to rotate together with the bolt will be tightened with respect to the ground member, and the terminal will not fall off from the ground member. Further, when the terminal becomes unusable, the terminal can be removed from the grounding member for conversion.

[Brief description of drawings]

FIG. 1 relates to an embodiment of a ground terminal according to the present invention,
(A) is a plan view and (b) is a front view.

2A and 2B relate to a remote mobile station device, FIG. 2A is a plan view, and FIG.
Is a front view, (c) is a right side view, and (d) is a bottom view.

FIG. 3 relates to a conventional ground terminal, (a) is a plan view,
(B) is a front view.

FIG. 4 is a front view of a bolt according to a conventional ground terminal.

[Explanation of symbols]

12 ... Bottom plate 12a ... Left female screw 14 ... Ground terminal 15 ... Terminal 15a ... Female screw 16 ... Head 17 ... Left male screw 18 ... Welded part

Claims (2)

[Claims] 1. A grounding terminal configured by connecting one end of a terminal having a right-handed screw portion to a grounding member, wherein a left male screw is formed at one end of the terminal while a left female screw is formed on the grounding member. A grounding terminal formed by welding the left male thread to the left female thread. 2. The ground terminal according to claim 1, wherein at least one pair of flat surfaces substantially parallel to each other is provided on the outer peripheral surface of the other end of the terminal.