JPH06290835A - Grounded outlet - Google Patents

Abstract

(57) [Abstract] [Purpose] An object is to provide a grounded outlet that enhances the electrical insulation between adjacent terminal fittings in a body and that also provides high productivity in assembly. [Structure] Three terminal fittings 30, 40, 50 mounted in a main body 1 composed of a cover 20 and a body 10 are formed in parallel by a peripheral wall 10a of the body 10 and a partition wall 11a, a cut groove 11b, a protruding portion 11c and the like. 3-strip terminal fitting housing 1
The external terminals 31, which are mounted in the same direction without crossing the inside of 2, 13, 14 and for power supply connection,
41 and an external terminal 51 for ground connection are provided on the side wall of the body 10 with a relative step. [Function] The creepage distance between the power supply and grounding terminal fittings is increased, the electrical insulation between the terminal fittings is improved, and three terminal fittings can be easily simultaneously supplied into the body during assembly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grounded outlet having blade receiving holes for inserting a plurality of sets of plug blades.

[0002]

2. Description of the Related Art Generally, when a plurality of electric machines are used together, power is received from an outlet having a plurality of sets of blade receiving holes for inserting plug blades, or these outlets are separated from the electric machines. In some cases, a table tap is connected to an outlet, and a plug receiving blade hole for inserting a plug blade of this tap is inserted and connected to a plug plug blade of an electric machine tool for convenience of use. .

On the other hand, in recent electric machines and appliances, the ground connection of the device is becoming popular from the viewpoint of the precision of the device and the safety of human body protection. For this purpose, a two-pole plug with a ground wire and a ground terminal are used. The three-pole plugs that have been used have been used, and outlets and table taps into which the blades of these plugs are inserted are also provided with a set of three holes for receiving the plug blades.

An outlet having such a ground terminal has a pair of blade receiving holes for inserting power source plug blades, which are parallel to each other on the upper surface of a rectangular cover, and an earth located at a position apart from the centers of the two blade receiving holes. There is a so-called double outlet in which, for example, two sets are formed with one set of the blade receiving holes of the plugs.

In the conventional double outlet, a pair of terminal fittings having a blade receiving spring for inserting a power source plug blade are arranged in line in a terminal fitting housing formed in the body so as to be line-symmetrical, and the opening side of the body is located. The terminal fitting for grounding was mounted from the bottom surface side of the body, and the blade receiving spring forming a pair with the blade receiving spring for inserting the power source plug blade was exposed to the opening side. However, with such a configuration, the terminal fittings must be mounted from the opening side and the bottom side of the body, and there is a problem that the workability of assembly is poor.

Then, as a means for coping with this, a double outlet having a structure as described in Japanese Patent Publication No. 3-28026 was invented.

[0007]

However, the structure described in this publication has three components for power supply and ground.
Although it has the advantage that it can be installed from the opening side of the body and can be automated, the three terminal fittings can be installed at the same time because the terminal fittings for power supply and ground are arranged in the same housing. Supply operation becomes complicated. In addition, in the portion where the terminal fittings are spaced apart but overlapped with each other, the insulating property is electrically enhanced by the partition wall and the like in other portions in the body, whereas the insulating property in this portion is improved. Worry about the consideration.

The present invention has been made in view of this point, and it is an object of the present invention to provide a grounded outlet in which electrical insulation between adjacent terminal fittings in a body is enhanced and, in addition, high productivity is obtained in assembly. To aim.

[0009]

According to a first aspect of the present invention, there is provided a grounded outlet having three terminals for power supply connection and ground connection in a main body composed of a cover and a body formed of an electrically insulating material. In the case where a metal fitting is attached and a blade receiving hole for a plug is provided in a cover portion corresponding to a blade receiving spring formed in the terminal metal fitting, the three terminal metal fittings include the peripheral wall of the body, the partition wall, the cut groove, and the protrusion. It is installed from the same direction without intersecting in the three-strip terminal metal fitting housing formed in parallel with each other, and the external terminal for power connection and the external terminal for ground connection have a relative step on the side wall of the body. It is characterized by being provided.

A grounded outlet according to a second aspect of the present invention is characterized in that the terminal fitting is formed with blade receiving springs at both ends and an external terminal at the center.

[0011]

[Function] The creepage distance between the terminal fittings for the power source and the ground is increased, the electrical insulation between the terminal fittings is improved, and the three terminal fittings can be easily simultaneously supplied into the body during assembly.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 is an exploded perspective view of a grounded outlet main body and a support to which this outlet main body is attached, FIG. 2 is a top view of the body after mounting three sets of terminal fittings, and FIG. A side view showing a state in which the outlet main body 1 is composed of a substantially rectangular body 10 made of an electrically insulating synthetic resin and a cover 20, and the body 10 has a partition wall 11 partitioned like a labyrinth.
a, 11a, ..., Grooves 11b, 11b ,.
, c, 11c, ... Are provided, and these partition walls 11a, 11 are provided.
a, ..., Grooves 11b, 11b, ... and peripheral wall 1 of body 10
0a, etc., the receiving chambers 12a, 13a, 14a,
..., two sets of power supply terminal boards 30 and 4 in three parallel receiving sections 12, 13 and 14 having 12b, 13b and 14b.
0 and a terminal plate 50 for ground connection, a total of three sets of terminal plates 30,
40 and 50 are attached. In addition, in the accommodating portions 12 and 13 located outside, the power source terminal plates 30 and 4 are provided.
0, and a terminal plate 50 for ground connection is mounted in the central housing portion 14.

Further, on the outer surface of the body 10, there are formed projecting portions 15 having windows 15w, 16w and 17w formed to face the terminals 31, 41 and 51 of the terminal plates 30, 40 and 50, respectively.
16 and 17 are provided with a step (the projecting portion 17 projects from the bottom side surface). This protrusion 15,
16 and 17 are not limited to those in which the central protruding portion 17 is most protruded, and the terminal plates 30, 40, 50 and the accommodating portions 12, 1,
It may be formed according to the configurations of 3 and 14. Also, 1
8 and 18 are four locking portions for locking the support.

Two sets of blade receiving holes 21, a first blade receiving hole 21 and a second blade receiving hole 22 of a pair of power source plugs, which are arranged in parallel on the surface side of the cover 20, are provided. A blade receiving hole 23 for the grounding plug is provided at the center between the blade receiving holes 21 and 22 of the two and the two sets of power source plugs. Further, on the outer wall surface of the cover 20, there are four protrusions 25, 26 that cover the windows 15w, 16w (26 cannot be seen hidden in the cover 20) and the four engaging portions for contact with the locking portions 18, 18 ,. Stops 28, 28, ... (Two are hidden behind the cover 20 and are not visible) are provided.

The two sets of power supply terminal fittings 30 and 40 are formed by press-molding a metal plate such as brass having good conductivity, and screws 32 and 42 are provided near the center so as to sandwich the terminal fittings 30 and 40. External terminals 31 and 41 for connecting to a power source, which are composed of angular nuts 33 and 43, and blade receiving springs 34 and 35 formed by cutting and raising metal plates from three sides at both ends.
44 and 45 are formed. In addition, the terminal fitting 50 for ground connection has a screw 52 and a square nut 53 similar to the above.
Blade receiving springs 54 and 55 are formed by cutting and raising metal plates from opposite directions at both ends of the external terminal 51.

It should be noted that the bent shapes of the terminal fittings 30, 40, 50 and the shapes of the accommodating portions 12, 13, 14 of the body 10 are matched with each other, and moreover, press molding and resin molding are easy and material loss is small. Bend, wall thickness of the body 10, partition walls 11a, 11a, ... and protrusions 11b, 11
are designed and provided in advance.

The support 60 is in the shape of an existing quadrangular frame, and has a mounting hole 61 for the outlet main body 1 in the center and screws for mounting on a wall surface or a pillar surface in the upper and lower portions of the frame body. Holes 62, 62 are provided, and four inverted M-shaped locking pieces 63, 63, ... Are provided downward from the frame portion.

Then, such a member is first prepared by the body 10.
Each of the storage chambers 12 of the three storage portions 12, 13, 14 formed by the peripheral wall 10a portion and the partition walls 11a, 11a ,.
a, 13a, 14a ... Inside the blade receiving springs 34, 34, 44,
44 parts of the external terminals 31, 41, 51 are pushed into the accommodation chambers 12b, 13b, 14b together, and the body 1
A total of three sets of terminal metal fittings 30, 40, 50 including a power supply terminal metal fitting 30, 40 and a ground connection terminal metal fitting 50 are mounted in the housing 0 to obtain the state shown in FIG.

Next, the cover 20 is placed on the body 10 and the four locking portions 28, 28, ... (2
The individual is hidden behind the cover 20 and cannot be seen. ) And 4 on the body 10 side
The individual locking portions 18, 18, ... Are brought into contact with each other, and the projecting portions 25, 26 on the cover 20 side (26 cannot be seen hidden by the cover 20) make the window portions 15w, 16 on the body 10 side.
The outlet main body 1 is configured so as to cover the upper part of w. It should be noted that the abutting surfaces of the body 10 and the cover 20 may be formed with engaging portions such as irregularities in advance.

Next, support 6 for this outlet body 1
0 into the mounting hole 61, and hooking the locking pieces 63, 63, ... In the shape of an inverted M into the recessed portions of the four sets of locking portions 17, 17 ,. When attached by this, the outlet main body 1 including the body 10 and the cover 20 is integrated with the support 60 as shown in FIG. Then, the protruding portions 14, 15, 16 on the body 10 side
An electric wire (not shown) for power supply and ground is passed through the hole formed in the bottom of the terminal, and the screws 32, 42, 5 of the external terminals 31, 41, 51 of the terminal fittings 30, 40, 50 are passed.
By tightening 2, the electric wires (not shown) are electrically connected to the terminal fittings 30, 40, 50. The grounded outlet with such a structure has three body-like terminal fittings that do not intersect each other in the shape of a river in the body of the main body, and is designed to be partitioned by an insulator so that it has electrical insulation. I was able to raise it. Further, since the external terminal connected to the power supply line or the ground is a fastening connection using a screw or the like, and is not a connection by simply pressing contact, the connecting portion is not oxidized due to aging and the conductivity is not lowered.

Since the terminal fittings do not intersect each other when the terminal fittings are attached to the body, the three terminal fittings can be easily supplied at the same time, and the structure of the attaching device is simple and the number of steps is reduced. It was also possible to improve productivity.

The present invention is not limited to the above-mentioned embodiments, but various modifications can be carried out without departing from the spirit of the present invention. For example, the shape of each terminal metal fitting and the shape of the metal fitting housing portion of the body in which the metal fitting is housed are not limited. Further, the number of blade receiving holes of the power source plug is not limited to two and may be three or more.

Further, the present invention has two sets of blade receiving holes for the power source plug, and one set has the blade receiving holes for the grounding plug and the other set.
The set can also be applied to an outlet provided with an earth terminal terminal outside the blade receiving hole of the power plug.

Further, in the above embodiment, the power supply wire and the grounding wire are connected to the external terminal of the terminal fitting by using the screw, but the fixing means of the wire is not limited to screwing, but a self-locking type wire connection, etc. It may be a fastening means. further,
The external terminal is not limited to the one for receiving electricity,
It may be a terminal that can be shared with a terminal for supplying power to other wiring equipment.

Further, the work of connecting the electric wire to the external terminal of the terminal fitting is not limited to after the outlet is attached to the support, and may be performed in the step before this attachment.

Furthermore, in the present invention, various positions of the blade receiving hole of the plug formed in the cover portion have been described. The position of the blade receiving hole and the blade receiving spring of the terminal fitting mounted inside the body are the same. It is located in place.

[0027]

As described above in detail, according to the present invention, 3
The electrical insulation between individual terminal fittings can be improved, the work of attaching the terminal fittings to the body can be done easily, and the structure of the mounting device is simple and the number of steps can be reduced, thus improving productivity. I was able to raise it.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an outlet and a support according to an embodiment of the present invention.

FIG. 2 is a top view showing a state in which a terminal plate is attached to the body of the outlet shown in FIG.

FIG. 3 is a side view showing a state after an outlet is attached to the support shown in FIG.

[Explanation of symbols]

1: Main body (outlet with ground) 10: Body 10a: Peripheral wall 11a: Partition wall 11b: Groove 11c: Projected portion 12, 13, 14: Terminal fitting housing 12a, 12b, 13a, 13b, 14a, 14b: Terminal fitting Storage chambers 12c, 13c, 14c: Terminal fitting housing portion 20: Covers 21, 22: Blade receiving hole for power supply plug 23: Blade receiving hole for ground plug 30, 40, 50: Terminal fitting 31, 41, 51: External Terminal

Claims (2)

[Claims] 1. A cover corresponding to a blade receiving spring formed on the terminal fitting by mounting three terminal fittings for power connection and ground connection in a main body composed of a cover and a body formed of an electrically insulating material. In the case where the blade receiving hole of the plug is provided in the part, the above three terminal fittings do not intersect in the three metal fitting housings formed in parallel with the peripheral wall of the body, the partition wall, the cut groove, and the protruding portion. A grounded outlet characterized in that it is mounted from the same direction, and an external terminal for power supply connection and an external terminal for ground connection are provided with relative steps on the side wall of the body. 2. The grounded outlet according to claim 1, wherein the terminal fitting is formed with blade receiving springs at both ends and an external terminal at the center.