JPH0128627Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a terminal device for electrical products that connects external conductors such as electric wires and conductor bars to supply electricity. Hereinafter, the explanation will be given using a wiring cutter as an example.

FIGS. 1 to 3 are cross-sectional views of conventional circuits and disconnectors, each showing different operating states.

1 is a cover, 2 is a base, and the cover 1 and the base 2 constitute a container 3. A fixed contact 4 has a fixed conductor 5, has a fixed contact 6 at one end, and the other part is a terminal part to which an external conductor (not shown) is connected. A movable contact 7 has a movable conductor 8 and a movable contact 9 facing the fixed contact 6 at one end thereof. 10 is a movable contact device, 11
is a movable contact frame fixed to the crossbar 12,
Each pole is opened and closed simultaneously. 13
is an arc extinguishing chamber in which an arc extinguishing plate 14 is held by a side plate 15. Reference numeral 16 denotes a toggle link mechanism, which is composed of an upper link 17 and a lower link 18. One end of the upper link 17 is connected to the cradle 19, and the other end is connected to one end of the lower link 18 by shafts 20 and 21, respectively. The other end of the lower link 18 is connected to the movable contact frame 11 of the movable contact device 10. Reference numeral 22 denotes a tiltable operating handle, and 23 an operating spring, which is stretched between the shaft 21 of the toggle link mechanism 16 and the operating handle 22. 2
Reference numerals 4 and 25 designate thermal and electromagnetic tripping mechanisms, respectively, which rotate the trip bar 28 counterclockwise by means of a bimetal 26 and a movable iron core 27, respectively, when activated. Reference numeral 29 is a latch whose one end is locked to the trip bar 28 and the other end is locked to the cradle 19.

When the operating handle 22 is tilted to the closed position with the cradle 19 locked to the latch 29, the toggle link mechanism 16 is extended, the shaft 21 is locked to the cradle 19, and the movable contact 9 is joined to the fixed contact 6. This state is shown in FIG. Next, when the operating handle 22 is tilted to the open position, the toggle link mechanism 16 is bent, the movable contact 9 is separated from the fixed contact 6, and the movable contact frame 11 is locked to the cradle shaft 30. This state is shown in FIG. Further, when an overcurrent flows through the circuit in the closed circuit state shown in FIG. The cradle 19 rotates clockwise and is locked to the stopper shaft 31. Credle 1
9 and the upper link 17 crosses the line of action of the operating spring 23, the toggle link mechanism 16 is bent by the spring force of the operating spring 23, and the cross bar 1
2, each pole is interlocked to perform automatic shedding. This state is shown in FIG.

FIG. 4 is an enlarged perspective view of the terminal portion, and FIG. 5 is a cross-sectional side view thereof. 32 is formed on the base 2, and includes both side walls 32a, 32b and this side wall 32.
A box body consisting of a base 32c between a and 32b,
33 is a reinforcement part, 34 is a terminal, 35 is a terminal screw, 3
Reference numeral 6 represents a spring washer, 37 a flat washer, 38 a fixing screw, and 39 an external conductor, and the terminal 34 is fixed to the base 32c with the fixing screw 38. Further, an external conductor 39 for supplying power is screwed and fixed to the terminal 34 by a terminal screw 35 via a spring washer 36 and a flat washer 37.

Here, when a force in the direction of arrow A is applied to the outer conductor 39 while the wiring sheath disconnector 3 is fixed, a force F _A is applied to the reinforcing portion 33 of the box body 32, and the outer conductor of the terminal 34 is inserted. Although a moment of F _A ×L ₁ is applied to the side using the fixing screw 38 as a fulcrum, the terminal 34 is stabilized because it is supported by the reinforcing portion 33. On the other hand, when a force in the direction of arrow B acts on the external conductor 39,
A force F _B acts on point C of the base 32c of the box body 32, and the fixing screw 38 is used as a fulcrum at the inner end of the terminal 34.
Although a moment of F _B ×L ₂ is applied, the terminal 34 is stabilized because it is supported by the base 32c. If a fairly large force is applied to the outer conductor 39 in the direction of arrow A or B, the outer conductor 39 will undergo plastic deformation.
No more than a certain limited moment is applied to the terminal 34. Therefore, the aforementioned moment F _A ×L ₁ and F _B
At ×L ₂ , both forces F _A and F _B are applied to the fixing screw 38 which is the fulcrum. The load applied to the fixing screw 38 acts as a tensile force on both sides of the terminal 34 holding the fixing screw 38, so that the box body 32 around the fixing screw 38 withstands the limited moment described above. Therefore, it was necessary to reduce F _A and F _B to the same extent. For that L ₂
had to be made large so that it was almost equal to L ₁ .

Since the conventional terminal device of this type is constructed as described above, it has the disadvantage that the terminal becomes large and uneconomical, and at the same time, the internal space is compressed.

This idea was made in order to eliminate the drawbacks of the conventional ones as described above, and it is designed so that all the forces in the directions of arrows A and B shown in Fig. 5 are received at the end of the terminal on the side where the outer conductor is inserted. The purpose of this invention is to provide a terminal device that is economical and allows effective use of internal space by reducing the size of the terminal.

An embodiment of this invention will be described below with reference to FIGS. 6 to 9. In the figure, the same parts as in FIGS. 4 and 5 are designated by the same reference numerals. In the figure, 34A
is a terminal, which has a female screw 34a for the fixing screw 38 and a female screw 34b for the terminal screw 35, and has a pair of left and right protrusions 34B, 34C on both sides of the end on the side where the external conductor is inserted, and the inner end The side has a length up to the female thread 34a. 40A, 40
B is a recessed portion provided on both side walls 32a, 32b of the box body 32, respectively, for accommodating the respective protrusions 34B, 34C, and one recessed portion 40A extends downward from the portion of the shoulder 40a that comes into contact with the upper surface of the protrusion 34B. The other concave portion 40B is a long groove extending upward from the shoulder 40b that abuts the lower surface of the convex portion 34C. In this way, the recesses 40A, 40B are extended in opposite vertical directions, and the recesses are arranged so that they face each other by the thickness of the terminal 34A on both sides of the terminal 34A, that is, both shoulders 40a, 4 of both recesses 40A, 40B
Since the distance d ₁ of the terminal 0b and the thickness d ₂ of the terminal 34A are made to be the same, the terminal 34A can be made oblique and both the protrusions 34B and 34C can be fitted into the recesses 40A and 40B. 34A becomes easy to fit in, and when the terminal 34A is attached, its convex portions 34B and 34C fit into the respective concave portions 40A and 40B.
Terminal 34A contacts both shoulders 40a and 40b of terminal 34A.
does not move up and down and is held tightly.

In FIG. 8, when force is applied to the outer conductor 39, the recesses 40A and 40B of the box body 32 and the terminal 34A
The convex portions 34B and 34C engage with each other and receive the force. To explain this with reference to FIG. 7, when a force in the direction of arrow A is applied to the external conductor 39, a moment applied to the terminal 34A is generated using the fixing screw 38 as a fulcrum, and the moment F _A ×L ₁ that must be withstood is arise. Then, the force of F _A is applied to the box 3 as shown in Figure 8.
The terminal 34A is added to the shoulder 40b of the concave portion 40B of No. 2.
becomes stable. On the other hand, when a force is applied in the direction of arrow B, a moment F _B ×L ₁ is generated in the same way, and as shown in FIG.
A force F _B is applied to the terminal 34A, and the terminal 34A becomes stable.

If L ₁ here is the same size as L ₁ in the conventional terminal diagram shown in FIG. 5, the force in either direction of arrows A and B can be sufficiently withstood.

In the above embodiment, a recess 40 formed by a long groove is provided in the box body 32.
A and 40B are shown, but the same effect can be achieved by cutting out the outer side of the long groove as shown in FIG.

In each of the above embodiments, the terminal 34A has a pair of left and right protrusions 34B, 34C, but if necessary, two pairs of left and right protrusions may be used.

As described above, according to this invention, the force applied to the external conductor in two directions is received at the end of the terminal on the side where the external conductor is inserted, so there is no need to extend the terminal further inside than the fixing screw as in the conventional case. This eliminates the need for terminals, which reduces the size of the terminals, making it more economical and making effective use of the space inside the box.

[Brief explanation of drawings]

1 to 3 are structural diagrams showing the operation of the conventional product, and FIGS. 4 and 5 are enlarged views of the terminal portion of the conventional product. Figures 6 to 9 show terminal structure diagrams according to the present invention, and Figure 6 shows the box 32.
FIG. 7 is a cross-sectional side view thereof, FIG. 8 is a cross-sectional view taken along the line - - in FIG. 7, and FIG. 9 is a terminal 34A.
FIG. FIG. 10 is a perspective view of a box body 32 showing another embodiment. Note that the same reference numerals in the figures indicate the same or equivalent parts. In the figure, 32 is a box body, 32a, 32b are both side walls, 3
2c is a base, 34A is a terminal, 34B, 34C are convex parts, 35 is a terminal screw, 38 is a fixing screw, 39 is an external conductor, 40A, 40B are concave parts, 40a, 40b
is the shoulder.

Claims (1)

[Claims for Utility Model Registration] 1. A box consisting of both side walls and a base between the both walls, a terminal attached to the base inside the box with a fixing screw, and a terminal screwed to the terminal. , in a terminal device having a terminal screw for connecting an external conductor, at least a pair of left and right protrusions are provided on both sides of the end of the terminal on the outer conductor insertion side, and recesses for accommodating these protrusions are respectively arranged in the box. Provided on both side walls of the body, one side of one convex part is brought into contact with the shoulder of one concave part to prevent the terminal from moving away from the base, and one side of the convex part of the other is placed in contact with the shoulder of the other concave part. A terminal device characterized in that the terminal base is brought into contact with the base of the terminal to prevent movement in the direction of pressing the terminal base. 2. The terminal device according to claim 1, wherein both the recesses are long grooves extending in opposite directions from the shoulder to beyond the protrusion.