JPS6011496Y2 - Front connection socket type electricity meter - Google Patents

Description

[Detailed description of the invention] The present invention uses a socket-type terminal for a front-connection type watt-hour meter, which includes a fixed terminal on the watt-hour meter (hereinafter referred to as the meter) side and an insertable terminal on the line side that is detachably attached to the fixed terminal. This relates to a front-connection socket-type instrument that is divided into two parts: a terminal and a terminal.

This type of conventional instrument (yo, front-connection type, rear-connection type,
There are three known types: 1, and a rear socket connection type.

All of these connection types, except for the rear socket connection type, are connected to the instrument by screws.

This screw connection method requires time and effort when installing and removing the meter, and also causes loosening, making it difficult to maintain a stable tightening state over a long period of time.

The rear socket type connection method is not used in Japan, but is mainly used in the United States, and is generally used in cases where it is impossible to install the CT socket part due to the structure of the Japanese building structure. Many of them are unsuitable.

Therefore, in order to eliminate the above-mentioned drawbacks, a front-connection socket type instrument has already been proposed, which stabilizes the connection state without changing the installation conditions of the conventional front-connection method (Japanese Utility Model Publication No. 49-39350). reference).

In this known front-connection socket type instrument, the terminal part of the front-connection instrument is made into a socket type and divided into two parts, a fixed terminal and an insertion terminal, and a connecting wire can be crimped or welded to the insertion terminal. In addition, the common terminal is provided on the insertion terminal side, and the number of internal terminals of the meter is kept to a necessary minimum, and the meter is molded.

However, with this type of socket-foot type connection method, there are occasional accidents due to poor contact due to incomplete insertion, accidents due to falling out, and even natural loosening due to its own weight and vibration even if it is fully inserted. Therefore, there was a risk of causing the same result as in the case of incomplete insertion.

Therefore, the purpose of the present invention is to prevent the insertion of a front-connection socket-type instrument from being incompletely inserted, and to prevent the possibility of incomplete insertion.
The object of the present invention is to improve the ability to easily perform approaching and separating operations without causing loosening of the engaged state.

In order to achieve this objective, the present invention includes a guard fixedly provided on the back side of the insertion terminal with respect to the fixed terminal, and a protrusion on one of the back side of the insertion terminal opposite to the guard. and a recess having a slope corresponding to the protrusion is formed on the other side, and a through hole is formed in the insertion terminal from the front side to the back side and elongated in the insertion/removal direction. A screw hole is formed in the guard opposite to the through hole, and when a screw is screwed into the screw hole through the through hole, the protrusion is brought into contact with the sloped surface, and the force in the insertion direction is generated. The present invention is characterized in that the insertion terminal is brought into close contact with the fixed terminal.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a fixed terminal 1, an insertion terminal 2, and an additionally provided terminal cover 3, which constitute the front connection socket type meter of the present invention.

As shown in FIGS. 2 to 4, the fixed terminal 1 consists of an insulator 10 and metal pieces 11 to 14 passing through the insulator 10.

One end side of the metal pieces 11 to 14 has current terminals AI and Bl for connecting lead wires from a meter, for example, with screws 15.
and voltage terminals P1, Ql, and the other end is a connecting plug A2. B2 and P2. Configure Q2.

This fixed terminal 1 is attached to a meter case by screwing a screw 17 into a screw receiving plate 16 inserted into an insulator 10 through the meter case (not shown).

Elastic plates having insulation properties, such as rubber plates 18 and 19, are arranged on the upper and lower surfaces of the insulator 10.

The insertion terminal 2 has an insulator 20 as shown in FIGS.
and metal pieces 21 to 24 incorporated therein.

One end of the metal pieces 21 to 24 is connected to the connection plug A2. B2. P
2. Plug receiver A3 to accept Q2. B3. P3t
It is configured as Q3.

Among these metal pieces, metal pieces 21, 22, and 24 extend over almost the entire length in the vertical direction, and the other end of the metal pieces 21, 22, and 24 is connected to the terminal A4. B4.
It is configured as Q4.

The metal piece 23 is only about half the length of the metal pieces 21, 22, and 24, and is electrically conductive to the metal piece 21 via the connecting conductor 25 without forming a terminal on the end opposite to the plug holder P3. It is connected.

Note that in the case of an instrument with a transformer, the metal piece 23 has the same shape as the metal piece 24.

Each terminal is covered by an insulator 20, so that the insulator 20 is provided with through holes 26, 27, 28 for guiding the electric wires 41, 42 connected to the terminals.

Terminals 43 and 44 are attached to the tips of the connecting wires 41 and 42, and screws 45 and 46 are used to connect terminals A4 and 44. B4. It is screwed to Q4.

The case of the instrument has a guard 30 to cover the fixed terminal 1 and the insertion terminal 2. After the insertion terminal 2 is attached to the fixed terminal 1, the terminal cover 3 is covered, and the sealing screw 31 is inserted from above.
It is securely fixed by passing the insertion terminal 2 through the vertically elongated through hole 29 and screwing it into the screw hole 32 of the guard 30.

In this case, an elastic plate 33 made of rubber or the like is inserted between the guard 30 and the insertion terminal 2.

Terminals A4 and B4 of insertion terminal 2 are connected to the power supply side connection wire IS and the load side connection wire 1L on one side of the line, respectively.
is connected to the terminal Q4, and the power supply side connecting wire 2S and the load side connecting wire 2L on the other side of the line are commonly connected.

Further, a current coil of the meter is connected between current terminals A1 and B1 of the fixed terminal 1, and a voltage coil of the meter is connected between voltage terminals P1 and Ql.

The insertion terminal 2 and the guard 30 are provided with a recess 34 having a sloped surface on the former for positioning and automatically obtaining a fully inserted state, and a corresponding protrusion 35 on the latter.

According to the above configuration, when inserting and fixing the insertion terminal 2,
After inserting the insertion terminal 2 into the fixed terminal 1 as far as possible by hand, screw the sealing screw 31 into the screw hole 32 through the through hole 29 from above the terminal cover 3 to connect the slope of the recess 34 and the protrusion 35. Under the cooperative action, a component force is generated in the insertion direction perpendicular to the screwing direction, so that the insertion terminal 2 can be inserted and fixed in a completely tight state.

Moreover, the work of mounting and mounting is easy, and the above-mentioned objective can be achieved in a good manner.

In the embodiments described above, the case of a single-phase meter has been explained, but the present invention is not limited thereto, and can be suitably applied to a three-phase meter.

Furthermore, in the above embodiment, the fixed terminal is of a plug type,
Although a configuration in which the insertion terminal is configured as a plug receiver is shown, the present invention can achieve the same effect even if the relationship is reversed.

Furthermore, regarding the recesses and protrusions, recesses may also be formed on the guard side.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of an embodiment of the watt-hour meter of the present invention, Fig. 2 is a perspective view of the fixed terminal in Fig. 1 seen diagonally from above, Fig. 3 is a front sectional view thereof, and Fig. 4. is IV- in Figure 3.
5 is a perspective view of the insertion terminal seen diagonally from above in FIG. 1, FIG. 6 is an exploded perspective view of the conductive member of the insertion terminal, and FIG. A front sectional view of the insertion terminal, FIG. 8 is a sectional view taken along the line ■--■ in FIG. 7. 1...Fixed terminal, 10...Insulator, 1
1-14...metal piece, 2...insertion terminal, 2o/bend/insulator, 21-24...metal piece,
29...Through hole, 3...Terminal cover,
30...Guard, 31...Sealing screw,
32... Screw hole, 34... Recess, 35
······protrusion.

Claims (1)

[Scope of utility model registration request] In a front-connecting socket-type watt-hour meter, the terminal part of the front-connecting watt-hour meter is made into a socket type and divided into two parts: a fixed terminal on the meter side, and an insertion terminal on the track side that is detachably attached to this terminal, A projection is formed on one of a guard fixedly provided to the fixed terminal on the back side of the insertion terminal and a back surface of the insertion terminal opposite to the guard, and a projection is formed to correspond to the projection. forming a recess having a sloped portion on the other side, and further forming a through hole extending through the insertion terminal from the front side to the back side and elongated in the insertion/removal direction, and facing the through hole. A screw hole is formed in the guard, and by screwing a screw into the screw hole through the through hole, the insertion terminal is moved against the fixed terminal by a component force in the insertion direction that is generated when the protrusion comes into contact with the sloped surface. A front-connection socket-type watthour meter characterized in that the power meter is configured to be tightly connected to the front.