JPH0511669Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] This invention relates to an outlet provided with a ground terminal.

[Background technology]

The inventor has developed the following outlet with a ground terminal. That is,
A hole for inserting a plug blade, an opening, and a conductor insertion port adjacent to the opening are provided on one side of the casing, and a blade receiving spring is arranged at the back of the hole for inserting a plug blade.
A ground terminal is placed at the back of the opening. The ground terminal is a pull terminal type that includes a ground terminal plate, a washer placed on the back side of the ground terminal plate, and a terminal screw that passes through the ground terminal plate from the front side and draws and fixes the washer to the ground terminal plate. The head of the terminal screw is placed in such a way that the head of the terminal screw can be seen through the opening without protruding from the opening. The conducting wire insertion port is configured to guide the conducting wire in an oblique direction from the outside of the casing toward the ground terminal to reach between the washer and the ground terminal plate.

This electrical outlet with a ground terminal is designed so that the conductor is inserted into the conductor insertion slot, the tip of the wire is inserted between the washer and the ground terminal plate, and then the terminal screw is tightened to connect the conductor to the ground terminal. In this outlet with a ground terminal, the ground terminal does not protrude from the opening, so it does not become a hindrance. Therefore, connection is always possible regardless of the shape of the main body of the device provided with the plug blade. Furthermore, since the exposed area is narrowed, there is less risk of the ground terminal being damaged or corroded.
However, there has been a problem in that the strength of the wall portion between the opening of the casing and the conducting wire insertion port is often insufficient compared to the strength of other casing portions.

By moving the ground terminal and the opening away from the conductor insertion hole, the width of the wall between the casing opening and the conductor insertion hole becomes wider.
The strength of this wall section will be improved. However, if this is done, the size of the receptacle with a grounding terminal will increase, causing inconveniences such as not being able to meet the standards. It is also possible to improve the strength by extending the wall portion toward the conducting wire insertion port. However, if this is done, the conductor insertion opening is narrowed and the insertion angle of the conductor must be increased, making it difficult to insert the conductor.

[Purpose of invention]

This idea was made in view of these circumstances, and it is possible to always connect the appliance with the plug blade regardless of the shape of the body, and there is no risk of the ground terminal being damaged or corroded. The purpose is to provide an outlet with a ground terminal that is small and has a high casing strength.

[Disclosure of invention]

The inventor conducted repeated research in an attempt to achieve the above object by improving the above-mentioned electrical outlet with a ground terminal. As a result, they found that it was sufficient to move the terminal screw and the opening away from the conductor insertion port without changing the position of the ground terminal, and have now completed this idea.

Therefore, in this invention, a hole for inserting the plug blade, an opening, and a conductor insertion port adjacent to the opening are provided on one side of the casing, and a blade receiving spring is arranged at the back of the hole for inserting the plug blade. At the back of the opening, there is a ground terminal that has a ground terminal plate, a washer placed on the back side of the ground terminal plate, and a terminal screw that passes through the ground terminal plate from the front side and pulls and fixes the washer to the ground terminal plate. The head of the terminal screw is arranged so that it can be seen through the opening without protruding from the opening, and the conductor insertion hole faces the ground terminal from the outside of the casing and guides the conductor in an oblique direction to reach between the washer and the ground terminal plate. In an outlet with a ground terminal, the terminal screw installation position of the ground terminal is separated from the conductor insertion hole along with the opening position, and the width of the wall portion between the opening of the casing and the conductor insertion hole is Its gist is an electrical outlet with a ground terminal, which is characterized by its widening.

This idea will be explained in detail below.

1 to 4 show one embodiment of the electrical outlet with a ground terminal according to this invention. As shown in the diagram, this outlet has body 1, cover 2
and a mounting frame 3, and inside a casing 4 consisting of a body 1 and a cover 2, there are a ground terminal plate 5, a washer 6, a terminal screw 7, terminal fittings 8, 9, a release button 10, and a lock spring 11. It is now being stored. The body 1 includes protrusions 1a on both sides. Earth terminal plate 5, washer 6
and the terminal screw 7 constitute a ground terminal 12. The ground terminal plate 5 has two sets of vertical protruding pieces 5a and 5b facing each other on both sides of the lower part, and a horizontal piece 5 on the upper part.
c is provided with a notch 5d extending from the rear end toward the front. After the tip of the terminal screw 7 is inserted into the screw hole 6a of the washer 6, the thread is crushed.
The washer 6 is prevented from coming off the shaft rod 7a. The terminal screw 7 and washer 6 are combined with the ground terminal plate 5 by inserting the shaft rod 7a into the notch 5d, and the ground terminal 12 is of a tightening terminal type.
Here, as shown in FIG. 3, the center line a of the terminal screw 7 is shifted rearward from the center line b of the ground terminal 12, and the shaft rod 7a of the terminal screw 7 is
is inserted into the notch 5d. The terminal fitting (power supply side) 8 has a blade receiving spring 8a and vertically protruding pieces 8b and 8c facing each other. Terminal fitting (ground side)
9 also has a blade receiving spring 9a and vertically protruding pieces 9b and 9c facing each other. The lock spring 11 has an S-shaped upper portion 11a and a U-shaped lower portion 11b. The cover 2 has plug blade insertion holes 13a, 13b, an opening 14, and a conducting wire (ground wire) insertion opening 15 provided in the ceiling wall from the rear. Projections 2a are provided on both sides of the cover 2, and the projections 2a
A recess 16 is provided at the upper end. The length direction of the plug blade insertion hole 13a is along the width direction of the cover 2, and the length direction of the plug blade insertion hole 13b is along the length direction of the cover. Conductor insertion port 15
is a recessed opening 14 that becomes deeper toward the opening 14.
Openings 15a and 15b are provided on both sides of the side wall, and the front sides of both openings 15a and 15b are partitioned by a wall 15c that becomes thicker toward the opening 14 side. The mounting frame 3 has protrusions 3 protruding inward on both sides of the opening.
a and a U-shaped protruding piece 3b. The body 1 and the cover 2 are aligned with each other, and the protrusions 3a of the mounting frame are inserted into the recesses 16 on both sides of the cover 2, and the protrusions 3b are hung on the protrusions 1a on both sides of the body 1, so that they do not separate from each other. It seems fixed. The ground terminal 12 is attached to the casing 4 so that the terminal screw 7 is exposed through the opening 14 and the lock spring 11 is sandwiched between the protruding pieces 5a and 5b.
located within. The upper end of the terminal screw 7 is prevented from protruding from the upper surface of the casing 4. In the terminal fitting 8, the blade receiving spring 8a is located below the plug blade insertion hole 13a, and the locking spring 11 is sandwiched between the protruding pieces 8b and 8c. The locking spring 11 is sandwiched between the protruding pieces 9b and 9c, and the protruding pieces 9b and 9c are disposed in the casing 4, respectively. One of the release buttons 10 is the lower part 11b of the two lock springs 11 on the ground terminal 12 side.
The other release button 10 is arranged so that both sides are located in front of the tips of the lower parts 11b of the two lock springs 11 on the terminal fittings 8 and 9 side.

The outlet is used as follows. When connecting a conductor to the lower part of the earth terminal 12, the conductor is inserted between the lock spring 11 and the protruding piece 5a through an opening provided at the bottom of the body 1. To release the connection, use the release button 10 to push the tip of the lower part 11b of the lock spring and pull out the conductor. The connection and disconnection of the conductor wires to the terminal fittings 8 and 9 is also performed in the same manner. When connecting a conductor to the top of the ground terminal, do the following: As shown by the arrow in Figure 3,
The tip of the conducting wire 17 is slid down along the slope 15d of the conducting wire insertion port 15. And further conductor 17
When pushed in, the tip of the conductor 17 enters the casing 4 through the opening 15a or 15b and is guided to be inserted between the upper horizontal piece 5c of the ground terminal plate 5 and the terminal plate 6. Next, as shown in FIG. 4, tighten the terminal screws 7 and attach the terminal plate 6 to the horizontal piece 5.
If it is pulled to c, the conductor 17 will not come out.

This outlet with a ground terminal is provided so that the ground terminal does not protrude from the outer surface of the casing, so that it can be connected to any type of appliance main body equipped with a plug blade. Furthermore, since the exposed area is small, there is less risk of damage or corrosion, and there is less risk of deterioration in connection reliability of the conducting wire.

In addition, as mentioned above, in this outlet with a ground terminal, the terminal screw is installed so that the center line of the terminal screw is shifted backward from the center line of the ground terminal, that is, away from the conductor insertion hole. Accordingly, the opening is also spaced away from the conducting wire insertion port. Therefore, make sure that the center line of the terminal screw matches the center line of the ground terminal, or conversely, make sure that the center line of the former is shifted further forward than the center line of the latter, that is, closer to the conductor insertion hole. Compared to the case where the terminal screws are installed with the openings corresponding to the positions of the terminal screws, the wall portion between the opening of the casing and the conductor insertion opening (in Fig. 3) is 18) is wider. Therefore, the strength of this wall portion is increased, and the strength of the casing is improved.

Note that by reducing the insertion angle of the conductor, the conductor can be easily inserted between the ground terminal plate and the washer. In the embodiment described above, by reducing the slope of the conducting wire insertion port, the insertion angle of the conducting wire can be reduced.

[Effect of idea]

The electrical outlet with a ground terminal according to this invention is
On one side of the casing, there are holes and openings for inserting plug blades,
A conductor insertion port is provided adjacent to the opening, a blade holder spring is placed at the back of the hole for inserting the plug blade, and a ground terminal plate and a washer placed on the back side of the ground terminal plate are placed at the back of the opening. , and a ground terminal having a terminal screw that passes through the ground terminal plate from the front side and pulls and fixes the washer to the ground terminal plate, is arranged so that the head of the terminal screw can be seen without protruding from the opening, and the conductor An electrical outlet with a ground terminal whose insertion opening is designed to lead the conductor diagonally from the outside of the casing toward the ground terminal and reach between the washer and the ground terminal plate, and the terminal screw installation position of the ground terminal is in the opening. The width of the wall between the opening of the casing and the conductor insertion hole is widened, so that connection is always possible regardless of the shape of the body of the device equipped with the plug blade. , there is less risk of damage or corrosion to the ground terminal, and the casing has high strength.

In particular, in this invention, the conducting wire is fixed by being sandwiched between a washer that moves up and down as the terminal screw of the grounding terminal is rotated, and a grounding terminal plate that is fixedly installed on the upper surface of the washer. In other words, use the terminal screw to tighten the washer toward the ground terminal plate,
The conductor is fixed, and the terminal screw itself does not move up or down at all. Therefore, the head of the terminal screw is
It does not protrude from the surface of the casing 4 and does not interfere with the functions of the outlet.

However, with this kind of ground terminal structure,
It is necessary to insert the conductor further below the ground terminal plate. Compared to the conventional structure in which the conductor is sandwiched directly under the head of the terminal screw, the insertion depth of the conductor is considerably increased.

Therefore, if the structure of the terminal screw, terminal board arrangement, conductor insertion hole, etc. is the same as the conventional structure in which the conductor is sandwiched directly under the head of the terminal screw, the conductor can be inserted deeply at a steep angle. This makes it difficult to connect the conductor.

In order to make it easier to connect the conductor, the insertion angle of the conductor can be made shallower, but this requires reducing the slope of the conductor insertion opening and increasing the horizontal distance. The planar shape of the mouth becomes larger.

Therefore, in this invention, by moving the mounting position of the terminal screw to the ground terminal board to the back side when viewed from the conductor insertion hole, the actual distance of the conductor insertion part is extended, and the insertion angle of the conductor is shallower. This allows the conductor to be inserted smoothly all the way to the bottom of the terminal board.

This can be done by simply changing the mounting position of the terminal screw without changing the planar shape or arrangement of the ground terminal board or the conductor insertion port, so it has almost the same layout and structure as a conventional electrical outlet with a ground terminal, and many parts are used. can be shared.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of one embodiment of the electrical outlet with a ground terminal according to this invention, Figure 2 is a perspective view of the electrical outlet with a ground terminal, and Figures 3 and 4 are explanations of how to connect the conductor to the ground terminal. It is a diagram. 4...Casing, 5...Earth terminal plate, 6...
...Washer, 7...Terminal screw, 8a, 9a...Blade holder spring, 12...Earth terminal, 13a, 13b...Blug blade insertion hole, 14...Opening, 15...Conductor insertion port, 18... ...The wall portion between the casing opening and the conductor insertion port.

Claims (1)

[Scope of claim for utility model registration] (1) A hole for inserting a plug blade, an opening, and a conductor insertion port adjacent to the opening are provided on one side of the casing,
A blade holder spring is placed at the back of the hole for inserting the plug blade,
At the back of the opening is a ground terminal having a ground terminal plate, a washer placed on the back side of the ground terminal plate, and a terminal screw that passes through the ground terminal plate from the front side and draws and fixes the washer to the ground terminal plate. The head of the terminal screw is arranged so that it can be seen without protruding from the opening, and the conductor insertion hole is directed from the outside of the casing toward the ground terminal, leading the conductor in an oblique direction so that it reaches between the washer and the ground terminal plate. In an outlet with a ground terminal, the terminal screw installation position of the ground terminal is moved away from the conductor insertion hole along with the opening position, and the width of the wall between the opening of the casing and the conductor insertion hole is widened. An electrical outlet with a ground terminal. (2) Practical use in which the conductor insertion port has a hole penetrating the inside and outside of the wall in the side wall of the opening of a recess that becomes deeper toward the opening, and the angle of inclination of the bottom of the recess is small. An electrical outlet with a ground terminal as described in Item 1 of the Claims for New Patent Registration.