JPH012263A - Recessed earth terminal fixture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [technical field] The present invention relates to the structure of an earth terminal.

[Background Art] In conventional ground terminals, a terminal screw inserted into a washer is screwed into a screw hole in a terminal board, and a ground wire is inserted between the terminal board and the washer to be held. In this conventional example, when ground wires of different diameters, such as a solid wire and a stranded wire, are held on both sides at the same time, there is a problem that the holding power of the stranded wire is weak and it easily comes off when pulled. There was a problem that if it was inserted diagonally, it would easily come loose if you pried it.

[Object of the Invention] The present invention was invented in view of the above-mentioned conventional problems, and its purpose is to provide a ground terminal that can securely hold a ground wire and prevent it from coming off. There is a particular thing.

[Disclosure of the Invention] In the ground terminal of the present invention, in the ground terminal to which the ground wire 23 is connected, the terminal screw 15a inserted into the rectangular washer 15b is screwed into the terminal plate 14, and the four corners of the rectangular washer 15b are screwed together. The washer 15b is bent downward to form a side edge of the washer 15b in a substantially V-shape,
By adopting such a configuration, the above-mentioned conventional problems are solved. In other words, the ground wire 23 is sandwiched between the washer 15b and the terminal plate 14, which increases the holding force when holding two ground wires 23 of different diameters on both sides at the same time, and also makes it possible to connect single wires diagonally. Even if the washer 15b-2
The ground wire 23 can now be securely held at the sides, so that it will not come loose even if it is strained.

The present invention will be explained in detail below with reference to Examples. In FIG. 8, a housing 13 of the embedded earth terminal device is formed by covering a thermosetting resin body 11 with a thermoplastic resin cover 12, and a terminal board is placed inside the housing 13. 14 and a terminal screw 15a inserted into a washer 15b;
A lock spring 17 that holds the core wire of the ground wire wired inside the wall with the terminal board 14, and this lock spring 17 and the terminal board 14.
The cover 12 is provided with a door 18 that can be opened and closed to cover the upper part of the ground terminal housed in the body 13. .

The body 11 is formed with a storage recess 11a in which the terminal plate 14 and the like are stored, and locking holes 11b for attaching the cover 12 are provided on both sides of the upper surface. The bottom of the storage recess 11a is provided with an insertion hole into which a ground wire wired inside the wall is inserted, and a release hole 19 into which a screwdriver or the like is inserted to remove the inserted ground wire. From the bottom of the storage recess 11a, there is a partition wall 1 that is separated into a storage part that stores the substantially C-shaped lock spring 17 and a part into which the tip of the terminal screw 15m screwed onto the terminal plate 14 is screwed.
1c is formed.

The terminal plate 14 has a screw hole 14a drilled on its upper surface 14c for screwing together a terminal screw 15a with a washer 15b inserted therein, and an insertion piece 14b that is inserted into the storage portion in which the lock springs 1 and 7 are stored.
is formed. Further, the screw hole 14a of the terminal plate 14 is formed at a position A>B in the figure so as to be closer to the front side. Then, the unlock button 16 is inserted into the insertion piece 1 of the lock spring 17 and the terminal board 14.
4b and the storage recess 11. It is stored and arranged in a.

The washer 15b into which the terminal screw 15& is inserted has a rectangular shape with its four corners slightly bent downward, and the bent portion 1
5i, and the front and rear side edges, which are the side edges in the direction perpendicular to the direction in which the ground wire 23 of the washer 15b is inserted, are approximately in a V-shape.
The left and right side edges, which are the side edges parallel to the insertion direction, are approximately V-shaped, but the center part is a horizontal edge. By the way, the terminal screw 15 may be a washer-equipped terminal screw 15 with a washer 15b attached in advance, or the terminal screw 15 may be tightened by inserting the terminal screw 15 into the washer 15b.

The door 18 is made of flexible resin, and has a hinge portion 18b formed by making the central portion thinner in the lateral direction.
It is c. In other words, the door 18 can be freely bent and extended at the hinge portion 18b.

Locking pawls 33 are protruded from the sides at both lower ends of the fixing portion 18a, and cut grooves 32 are formed in the vertical direction inside the locking pawls 33. A notch 18d is formed in the upper part of the cover part 18c, and hook-shaped projections 21 are provided protruding from both sides of the notch 18d.

The cover 12 is opened at the center, and a convex portion 22a on which the cover portion 18e of the door 18 is placed is formed in the front-rear direction on the inner wall of the opening portion 22. A locking recess 22b for locking the locking claw 33 of the door 18 is bored in the lower part of the projection 22a, and the projection 21 of the door 18 is engaged with the upper surface of the projection 22a. The engagement hole 22d is bored. Note that the front wall 22c of the opening 22 is inclined downward toward the inside.

The cover 12 has claws 12a protruding from the lower portions of both sides, and by inserting the claws 12m into the locking holes 11b of the body 11 and locking the claws to the lower surface of the locking holes 11b, the cover 12 is fixed to the body 11 by breaking. Both side walls of this cover 12 each have a locking recess 12b into which a fixing claw of a metal mounting frame is locked, and a pair of locking pieces inserted into a locking hole in a synthetic resin mounting frame. 12e is formed.

The assembly of the above-mentioned embedded earth terminal device will be explained. The terminal plate 14 is housed in the housing recess 11a of the body 11 so that the two lock springs 17 are located inside. At this time, the washer 1 is attached to the terminal screw 15 on the terminal plate 14.
The terminal screw 15 with washer to which 5b is attached is pre-installed. The release button 16 is inserted into a groove formed on the bottom surface of the storage recess 11a, and is arranged so that the release pieces 16a formed on both sides are located in front of the tips of the lower portions 17a of the two lock springs 17. The terminal plate 14 and the terminal screw with washer 15 have their upper portions located within the opening 22 of the cover 12, and the upper end of the terminal screw with washer 15 is positioned inward from the upper surface 14c of the cover 12. . The fixing part 18m of the door 18 is inserted into the opening 22 from above the cover 12 in the vertical direction. At this time, when the protrusion 33 of the door 18 comes into contact with the side surface of the convex part 22m, the width of the fixing part 18a is narrowed by the cut groove 32, so that the opening 22 can be inserted therethrough. Then, when the cover 12 is attached to the body 11,
The door 18 is fixed to the container body 13 by the lower end surface of the fixing part 18a coming into contact with the partition wall 1.degree. 1c and by the protrusion 33 being locked in the locking recess 22b. Hinge part 1 of door 18
8b is formed at a position that does not protrude from the top surface of the cover 12, so that when the cover portion 18c is attached to the opening 22, the top surface of the cover portion 18a does not protrude from the top surface of the cover 12. When the cover portion 18c is attached to the opening 22 in this way and the lower surface is brought into contact with the upper surface of the convex portion 22, the protrusion 21 is engaged with the engagement hole 22d to maintain the attached state of the cover portion 18c. It is supposed to be done. When opening this cover part 18c, put your finger on the notch part 18d and open the cover part 18c.
If the cover portion 18c is raised upward, the elastic protrusion 21 is deformed and the engaged state is released, allowing the cover portion 18c to be opened.

Connect the ground wire to this ground terminal as follows.

Open the cover 18c, loosen the terminal screw 15a, and remove the washer 15.
b and the upper surface 14c of the terminal plate 14. Then, as shown in Fig. 2, connect the core wire of the ground wire 23 to the washer 1.
5b and the upper surface 14c of the terminal plate 14, and tighten the terminal screw 15a.

In this way, when inserting the ground wire 23 between the washer 15b and the upper surface 146 of the terminal plate 14, it is easy to insert the ground wire 23 between the washer 15b and the upper surface 146 of the terminal plate 14 because the front wall 22c of the opening 22 where the ground wire 23 is inserted is an inclined surface. A ground wire 23 can be inserted. When the ground wire 23 is connected, the cover portion 18c is closed. At this time, the notch 18
A ground wire 23 is pulled out from d. Moreover, since the screw hole 14a drilled in the upper surface 14c of the terminal plate 14 of the terminal screw 15 with washer is located closer to the front side, the washer 15b is closer to the front side, and the washer 15b and the opening 22a of the cover 12 are located behind the washer 15b and the opening 22a of the cover 12. If the ground wire 23 is inserted until a gap is created between the ground wire 23 and the wall and the tip of the ground wire 23 is exposed from the back side of the washer 15b, the core wire of the ground wire 23 will be exposed behind the washer 15b. It can be confirmed that the ground wire 23 is securely inserted. Here, when the ground wire 23 of 23 m of solid wire and the ground wire 23 of stranded wire 23b are sandwiched between the washer 15b and the upper surface of the terminal plate 14, they are sandwiched as shown in FIG. Since the side edges of the washer 15b are substantially bent, both the stranded wire 23b and the solid wire 23a are securely held by the side edges of the washer 15b, and in particular, they are prevented from coming off even if a tensile force is applied to the wire 23b. This means that it can be retained. Also, when the single wire 23a is connected diagonally, the washer 15
The single wire 23a can be securely held on the two sides b and will not loosen even if it is strained.

Next, when connecting the ground wire wired on the wall to the lower part of the terminal board 14, the core wire of the ground wire is inserted through the insertion hole. At this time, the core wire of the ground wire is connected to the insertion piece 14 of the terminal board 14.
b and is clamped and fixed by the lock spring 17. To release this fixed state, insert a screwdriver or the like into the release hole 19 and use the release piece 16a of the release button 16 to pull the lock spring 17 away from the insertion piece 14b of the terminal board 14 to release the clamped state. , remove the ground wire by pulling it out.

The embedded earth terminal device having the above configuration, for example,
It is embedded in a wall using a mounting frame 20 shown in FIG. The mounting frame 20 is made of synthetic resin, and is attached to a wall box (not shown) embedded in the wall through a box hole 25.

Three sets of two holes 27 are provided on one side of the mounting frame 20, and a horizontally long plate 28 that projects downward is provided on the opposite side, and an opening 29 is provided in this plate 28. Three openings 29 are arranged in parallel, and a convex protruding piece 30 is formed on the lower edge of each opening 29. The embedded earth terminal device is constructed by inserting the pair of locking pieces 12c on one side into a pair of holes 27, and then placing the pair of locking pieces 12c on the opposite side on the shoulder 30a of the protrusion piece 30 to open the opening. 29, and the embedded earth terminal device A is attached so that the use surface protrudes from the opening 31 of the frame itself, as shown by the dashed line.

In this way, the mounting frame 20 of the embedded earth terminal device
This allows for easy installation. The embedded earth terminal device shown in Figure 4 is one of the ready-made wall-mounted wiring devices.
Since it is formed to the dimensions of the module, other wiring devices equipped with the above-mentioned locking pieces on both sides can be attached using the remaining set of holes 27 and the protruding pieces 30, as shown in FIG. As shown in the figure, it can be easily installed in parallel with other wiring devices. The mounting frame 20 with the embedded earth terminal device attached in this way is attached to the wall box,
The plate 40 is attached to the mounting frame 20 using the screw holes 24, and the embedded earth terminal device is attached to the wall surface. In addition to the synthetic resin mounting frame 20 described above, a metal mounting frame can be used to attach the embedded earth terminal device to the wall using the locking recess 12b. In this way, the embedded type earth terminal device has the earth terminal located inside the body 13 rather than the use surface, and the door 18 which can be opened and closed freely.
By covering the opening 22 of the cover 12 with the cover 12, the ground terminal is not visible from the outside and looks good, and since the ground terminal does not protrude from the top surface of the cover 12, it cannot come into contact with the ground terminal and damage the ground terminal. Moreover, even when the horizontal lug is installed in parallel with the power outlet 41, the embedded earth terminal device does not get in the way and prevents the side lug from being inserted.

3 and 4 show other embodiments of the present invention.

In this embodiment, the lower surface of the head 15c of the terminal screw 15a is provided with a stepped portion 15d having a diameter smaller than that of the head 15c. When the stepped portion 15d is provided in this manner, the inclination of the washer 15b can be made larger as shown by the solid line in FIG. 4, compared to the one shown by the two-dot chain line without the stepped portion 15d in FIG. By improving the holding power of 23, the ground wire 2
It is possible to improve the tensile force of No. 3.

In addition, a rib 14d is provided on the upper surface of the terminal plate 14 as shown in FIGS.
The ground wire 23 may be made difficult to come off when the wires 3 are clamped. This rib 14d corresponds to the screw hole 14 on the top surface of the terminal plate 14. The ground wire 23 is formed long in the direction orthogonal to the direction in which the ground wire 23 is inserted before and after the wire a. By the way, if the rib 14d is formed and the shape is as shown in FIG.
Since it may get caught on the side of 4a,
), the side surface of the rib 14d on the screw hole 14a side is a gently sloped surface 14e that is lower as it approaches the screw hole 14a side.
By doing so, the ground wire 23 can be inserted smoothly using the inclined surface 14e as a guide.

In addition, in FIG. 12, a locking protrusion 15f is provided on the lower surface of the head 15e of the terminal screw 15a. The lower surface of this locking protrusion 15f is in the direction of tightening the terminal screw 15a (direction of arrow A in Fig. 12).
The lower surface part 15g is inclined downward from the tip side to the rear end side, and the rear end of the locking protrusion 15f is a substantially vertical surface 1.
It is 511.

The terminal screw 15a shown in FIG. 11 is inserted into the through hole 45a of the fixed object 45 as shown in FIG. After that, the terminal screw 15 is formed.
A is screwed into a screw hole of the object to which the fixed object 40 is to be attached. Therefore, the terminal screw 15a can be tightened with a weak torque, and a strong return torque is generated, thereby producing an effect of preventing loosening. The structure of this terminal screw 15 may also be applied to other -19 screws.

[Effect of the invention] In the present invention, in the earth terminal to which the earth wire is connected as described above, the terminal screw inserted into the rectangular washer is screwed into the terminal plate, and the four corners of the rectangular washer are screwed together. By bending the washer downward, the side edge of the washer is shaped into a substantially square shape, which increases the holding force when holding ground wires of different diameters on both sides at the same time, increasing the pulling force of the ground wire. Even if connected to the ground wire, the two sides of the washer can securely hold the ground wire and it will not loosen even if it is strained.

[Brief explanation of drawings]

Figure 1 is a perspective view of the washer used in the present invention, Figure 2 is a front view of the washer holding the same ground wires of different diameters, and Figure 3 (
a) and (b) are front and bottom views of other embodiments of the terminal screw, FIG. 4 is an explanatory diagram of the same conductor screw in an inclined state with a washer attached, and FIG. 5 is used in the present invention. FIG. 6 is a perspective view of the terminal board, FIG. 6 is a sectional view of the rib portion provided on the terminal board, FIGS. 8 is an exploded perspective view of the present invention, FIG. 9 is a cross-sectional view of the same as above, FIG. 10 is a perspective view showing a mounting frame attached to the wall of the same as above, FIG. Figures 12 (a) and (b) are front and bottom views of other examples of terminal screws, and Figures 13 (a) and (b) are explanatory diagrams and recesses for forming a recess in a fixed object using the same terminal screw. 14 is a terminal plate, 15a is a terminal screw, 1
5b is a washer, and 23 is a ground wire. Agent Patent Attorney Ishi 1) Chief 715b...Washer Figure 1 Figure 2 Figure 3 (b) Figure 4\ Figure 5 Figure 9'' Figure 0 Figure 511 (Q) Figure 13 Procedural amendment (voluntary) August 8, 1986

Claims (3)

[Claims] (1) At the earth terminal to which the earth wire is connected, screw the terminal screw inserted into the rectangular washer into the terminal plate,
An earth terminal characterized in that the four corners of a rectangular washer are bent downward so that the side edges of the washer are formed into a substantially V-shape. (2) The earth terminal according to claim 1, characterized in that a stepped portion having a diameter smaller than the diameter of the head is formed on the lower surface of the head of the terminal screw. (3) Long ribs are provided in the direction orthogonal to the insertion direction of the ground wire before and after the screw hole for screwing the terminal screw on the top surface of the terminal board, and the side surface of this rib on the screw hole side is extended as close as possible to the screw hole. The earth terminal according to claim 1, characterized in that it is formed as a gently sloped surface facing downward.