JP2002170605A - Terminal equipment for electrical appliances - Google Patents

Abstract

(57) [Summary] [Problem] To add a box part to a terminal part of an electric appliance while using a terminal plate for wiring a crimp terminal and a terminal cover attached to the terminal part as it is provided as standard. So that it can be turned for direct wiring. A direct wiring box (15) having screw holes on the top and bottom surfaces is superimposed on a terminal plate (5) having screw holes for crimp terminal wiring, which is provided as a standard feature on a terminal portion of an instrument case, and A terminal screw 5 is fastened to the terminal plate 5 through a flathead screw 18 in a screw hole on the bottom surface of the box, and a terminal screw 17 screwed into a screw hole on the top surface of the box with a wire of an electric wire inserted into the box from the front during wiring. The wire is inserted into the terminal portion 3a by covering the terminal plate and the box with the wire insertion hole 13a and the screwdriver insertion hole 13b.
Is attached to the terminal cover 13 having an opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring terminal device for an electric appliance, which implements an electromagnetic contactor and a thermal relay attached to the electromagnetic contactor.

[0002]

2. Description of the Related Art Electromagnetic contactors and thermal relays described above are provided with terminals for wiring electric wires of a main circuit, and the state is shown in FIGS. 6 (a) and 6 (b). In FIG. 6, the main body case of the electromagnetic contactor 1 and the thermal relay 2 is a resin mold case (hereinafter, referred to as an appliance case 3), and one corner of the case 3 is defined between the inter-phase barriers. A terminal 3a for a circuit and a control circuit is formed, and the terminal 3a is provided with a wiring terminal 4.

Here, as the wiring terminal 4, a terminal plate 5 for crimp terminal wiring as shown in FIGS. 7A to 7C is generally provided as a standard. That is, the terminal plate 5 is a flat copper plate having a screw hole 5a drilled at the end, and the terminal portion 3a of the instrument case.
It is assembled to draw out to. Then, in order to wire an electric wire with a crimp terminal (insulated wire) 6 to the terminal plate 5, a terminal screw 8 is passed through the crimp terminal 7 and screwed to the terminal plate 5.

[0004] A structure is also known in which the terminals 4 arranged on the terminal portion 3a of the instrument case are dedicated to direct connection of the wires of the electric wire, and this terminal structure is shown in FIGS. 8 (a) to 8 (d). Box 1 for direct wiring on flat copper terminal plate 9 without screw holes
The wire 6a of the electric wire 6 inserted into the box 10 from the front is pressed down between the terminal plate 9 and the main terminal screw 11 and the washer 12 screwed into the box 10 for wiring. Reference numeral 13 denotes a terminal cover for preventing electric shock attached to the terminal portion 3a for preventing electric shock. The terminal cover 13 is a resin molded product having an L-shaped cross section as shown in the figure, and has a square hole-shaped wire insertion hole 13a for inserting the wire 6 on the front surface thereof, and a driver (for operating the main terminal screw 11) on the upper surface. A driver insertion hole 13b into which a screwdriver 14 is inserted is open.

[0005] Further, depending on the wiring condition of the electric wire at the site at the place of use, the sheath of the electric wire may be peeled off without using the crimp terminal, and the electric wire may be directly connected to the terminal of the electric appliance. In order to turn the crimp terminal wiring terminal plate 5 of FIG. 7 which is standard equipment of the electric appliance below for direct wiring of electric wires, conventionally, the terminal plate 5 is attached to the terminal plate 5 as shown in FIGS. 9 (a) to 9 (c).
The box 15 shown in FIG.

In this terminal structure, a mounting leg piece 15 a having a screw hole extending rearward from the box 15 is superimposed on the upper surface of the terminal plate 5 and fixed with screws 16. The wire 6 of the electric wire 6 inserted into the box 15 from the front in this assembled state
a is held down by terminal screws 17 screwed to the upper surface of the box 15 as in FIG. In this structure, when the box 15 is screwed to the terminal plate 5, a leg piece 15 a is provided so that a screw operation by a driver can be performed without interference with the box 15. In the mounted state, the box 15 projects forward from the terminal portion 3a.

[0007]

By the way, as described above with reference to FIG. 9, in order to make the terminals for crimp terminal wiring, which are provided as standard equipment of the electric appliance, compatible with the direct wiring of electric wires, as shown in FIG. In the conventional terminal structure in which the box 15 for direct wiring is combined with the terminal plate 5, a terminal cover of a standard accessory as shown in FIG. 8 is attached so that the box 15 protrudes forward from the terminal portion of the instrument case. As a result, the user easily touches the box 15 of the terminal portion, and the risk of electric shock due to accidentally touching the charged portion during energization is increased.

The conventional terminal cover 13 shown in FIG. 8 has the following problems. That is, in the case where the electric wire 6 is directly wired to the terminal of the electric appliance, if the protruding length of the wire 6a becomes longer by removing the insulating coating of the wire more, the wire 6a is exposed outside the terminal cover 13 in the wiring state. However, there is a risk that the user may touch this part and get an electric shock. Further, an electric wire insertion hole 13a opened on the front surface of the terminal cover 13.
The size of stipulated in the standard is to secure a predetermined space between the electric wire and the periphery of the insertion hole with the actual used electric wire wired, and to test whether or not it is appropriate by inserting a test gauge into the inspection I am trying to do it. For this reason, in designing and manufacturing the terminal cover 13, the size of the wire insertion hole 13a is set in accordance with the standard based on the maximum wire diameter among the wires applied to the electric appliance. On the other hand, the thickness of the electric wire wired at the site where the electric appliance is used is various, and particularly the electric wire insertion hole 13a of the terminal cover 13
If a wire with a diameter smaller than the size of the wire is wired, a gap is left around the wire to allow fingertips or foreign matter to be inserted. There is a possibility that.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and can be used for direct wiring of an electric wire while directly using a terminal for crimp terminal wiring and a terminal cover which are provided as standard in electric appliances. Another object of the present invention is to provide a terminal device improved so as to enhance the function of protecting the charged portion of the terminal cover.

[0010]

According to the present invention, in order to attain the above object, according to the present invention, a screw is provided on a top surface and a bottom surface of a terminal plate having screw holes for crimp terminal wiring drawn out to a terminal portion of an instrument case. A rectangular tubular box for direct wiring having holes formed thereon is overlapped, and a screw is screwed into a screw hole on the bottom side of the box and fastened to the terminal plate, and at the time of wiring, a wire of an electric wire inserted into the box from the front is used. The terminal screw is screwed into the screw hole on the top surface of the box and connected to the bottom surface of the box by pressing it down, and a terminal cover is attached to the terminal portion so as to cover the terminal plate and the box (claim 1). .

According to the above arrangement, the box is fixed on the terminal board by being superimposed on the terminal board, so that the box does not protrude from the terminal section of the instrument case. With the terminal cover attached, the wires can be inserted directly into the box for direct wiring. Moreover, when the box is screwed on the terminal board with screw holes, the screwing operation can be performed from above by inserting a screwdriver into the screw holes opened in the upper surface of the box.

According to the present invention, the terminal cover in the above configuration is a resin molded product having an electric wire insertion hole on the front surface and a driver insertion hole on the upper surface. An eave-shaped projection extending forward along the region is formed (claim 2). As a result, even if the length of the bare wires is slightly longer, the eaves-like projections of the terminal cover cover the exposed portions of the wires, so that there is no possibility that a hand or a foreign object may come into contact with the charged portion from the outside, and high safety is provided. Can be secured.

(2) A detachable arch-shaped guard rib extending across the hole is formed inside the wire insertion hole opened on the front surface of the cover (claim 3). According to this configuration, even when the thickness of the actually used wire is thin, the arch-shaped rib extending into the hole so as to cross the space above the wire in a state where the wire is laid through the wire insertion hole of the terminal cover is provided on the guardrail. Therefore, it is possible to prevent a hand or a foreign object from touching the charged portion (the wire of the electric wire) inside the terminal cover from the outside, thereby ensuring high safety. Also, when wiring a thick wire to the terminal, or when testing whether the hole size of the terminal cover is in accordance with the standard by inserting a test gauge into the wire insertion hole, break the base of the guard rib. We can easily cope by cutting.

[0014]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to an embodiment shown in FIG. In the drawings of each embodiment, the same members corresponding to FIGS. 7 to 9 are denoted by the same reference numerals, and description thereof will be omitted. [Embodiment 1] FIGS. 1 to 3 are structural views of a terminal device according to claim 1 of the present invention. In this embodiment, first, as shown in FIGS. 1 (a) to 1 (d), a terminal plate 5 having screw holes which is provided as a crimp terminal wiring terminal in a terminal portion 3a of an instrument case as a standard is provided. The box 15 for inserting and connecting the element wire of the electric wire is overlapped on the terminal plate 5 and screwed to the terminal plate 5 via the countersunk screw 18. Cover terminal part 3a
A terminal cover 13 is attached to the terminal device, thereby constituting a terminal device corresponding to direct wiring of electric wires.

Here, the box 15 is a copper square tube having open front and rear surfaces, and has screw holes formed on the upper and lower surfaces thereof, and terminal screws 17 are screwed into the screw holes on the upper surface side. . On the other hand, the terminal cover 13 is an L-shaped resin mold plate similar to the terminal cover shown in FIG. 8, and has a rectangular wire insertion hole 13a on the front surface and a driver insertion hole 13b on the upper surface.
Is open.

In order to directly wire the electric wire 6 without using a crimp terminal in this terminal device, as shown in FIG. Part 3
a, is inserted into the box 15 through the wire insertion hole 13a of the terminal cover 13, and in this state, the driver 14 is inserted from above through the upper hole of the terminal cover 13, and the terminal screw 17 of the box 15 is screwed to connect the element wire 6a. The wiring is directly held between the terminal screw 17 and the bottom surface of the box 15 for wiring.

When wiring an electric wire with a crimp terminal, the box 15 is removed from the terminal plate 5, and in this state, the terminal screws 8 passed through the crimp terminal 7 as shown in FIG. Wiring is performed by tightening the screws with a screwdriver 14 inserted through the upper hole 13b of the terminal cover 13. In order to attach the box 15 to the terminal plate 5, as shown in FIGS. 3 (a) to 3 (c), the terminal cover 13 and the terminal screws 1 described above are used.
The box 15 is placed on the terminal plate 5 with the 7 removed, and at this position, a countersunk screw 18 passed through a screw hole on the lower surface side of the box 15 is used by using a screw hole 15a on the upper surface side of the box 15. Tighten the screw with the screwdriver 14 inserted from above.

As described above, the rectangular tube-shaped box 15 having screw holes formed on the upper and lower surfaces is overlapped on the terminal plate 5 and screwed, so that the box 15 can be formed as in the conventional example shown in FIG. It does not protrude outside from the terminal portion 3a, but fits inside the terminal cover 13 attached to the terminal portion 3a. Further, by inserting the driver 14 into the screw hole 15a for the terminal screw 17 formed on the upper surface side of the box 15, the screwing operation of the terminal plate 5 and the box 15 can be performed without disturbing the box. .

Embodiment 2 FIGS. 4A and 4B are structural views of a terminal cover according to a second aspect of the present invention. In this embodiment, a wire insertion hole 13 is provided on the front surface of the terminal cover 13.
An eave-shaped projection 13c is formed to protrude forward along the periphery of a. In the wiring state of the electric wire 6 shown in FIG. 2 (a), this eave-shaped projection 13c is exposed to the outside of the terminal cover 13 because the bare wire 6a has a slightly longer length. The projections serve as guard fences to prevent fingertips and foreign objects from touching the wires. As a result, it is possible to prevent an unexpected electric shock accident in which the user touches the charging unit by mistake.

Embodiment 3 FIGS. 5A and 5B are structural views of a terminal cover according to a third aspect of the present invention. In this embodiment, a detachable arch-shaped guard rib 13d extending across the wire insertion hole 13a opened on the front surface of the terminal cover 13 is formed on the front surface of the cover.

Thus, even when the thickness of the actually used electric wire is thin, the arched wire extends across the space above the electric wire in a state where the electric wire is wired to the terminal portion through the electric wire insertion hole 13a of the terminal cover 13. Rib 13d serves as a guardrail. Accordingly, it is possible to prevent hand foreign matter from touching the charged portion (the wire of the electric wire) inside the terminal cover 13 from the outside, thereby ensuring high safety.

When the wire used for actual use is thick, or when a test gauge is inserted into the wire insertion hole 13a to check whether the hole size of the terminal cover 13 is in accordance with the standard, the guard rib is used. It can be easily dealt with by cutting off the base of 13d.

[0023]

As described above, the following effects can be obtained by the configuration of the present invention. (1) According to the configuration of claim 1 of the present invention, a box for direct wiring having screw holes formed on the top and bottom surfaces is provided on a terminal plate for crimp terminal wiring, which is provided as a standard feature on the terminal portion of the instrument case. By overlapping and screwing to the terminal plate, the wires of the electric wire inserted into the box from the front were tightened with the terminal screws screwed into the screw holes on the upper surface side of the box, and the wires were pressed down and wired, so that the terminals were wired. The terminal plate for the crimp terminal wiring can be turned for direct wiring of the electric wire while securing the safety of protection of the charged portion by attaching the cover.

(2) The eaves-shaped projection according to claim 2 or the eaves-like projection according to claim 3,
By forming the guard ribs, it is possible to improve the protection function of the charged portion of the terminal cover and improve the safety of preventing electric shock to the terminal device while securing the insertion test gauge space defined by the standard.

[Brief description of the drawings]

FIG. 1 is an assembly structure diagram of a terminal device corresponding to a first embodiment of the present invention, in which (a) is a longitudinal side view, (b) is a partial cross-sectional front view, (c) is a cross-sectional plan view, d) Front view of terminal cover

FIG. 2 is an explanatory view showing an operation procedure for wiring an electric wire to the terminal device of FIG. 1;
(b) is the state diagram when wiring the wire with crimp terminal

FIGS. 3A and 3B are explanatory views showing an operation procedure for screwing a box to a terminal plate in the terminal device of FIG. 1, wherein FIG. 3A is a side view, FIG. 3B is a front view, and FIG.

4A and 4B are structural diagrams of a terminal cover corresponding to Embodiment 2 of the present invention, wherein FIG. 4A is a front view, and FIG.

5A and 5B are structural views of a terminal cover corresponding to the third embodiment of the present invention, wherein FIG. 5A is a front view, and FIG.

FIGS. 6A and 6B are illustrations of electric appliances employing the terminal device of the present invention, wherein FIG. 6A is a thermorelay and FIG.

FIG. 7 is a structural view of a crimp terminal wiring terminal provided as standard equipment in the electric appliance of FIG. 6, (a) is a longitudinal side view, (b) is a front view, and (c) is a cross-sectional plan view.

8 is a structural view of a terminal for direct wiring employed in the electric appliance of FIG. 6, wherein (a) is a longitudinal side view, (b) is a front view, (c) is a cross-sectional plan view, and (d) is a conventional plan view. Front view of terminal cover

9 is a conventional terminal structure diagram in which the terminal plate of FIG. 7 is turned into a terminal for direct wiring, (a) is a longitudinal side view, (b) is a front view, and (c) is a cross-sectional plan view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 3 Instrument case 3a Terminal part 5 Terminal plate for crimp terminal wiring 6 Electric wire 6a Element wire 7 Crimp terminal 8, 17 Terminal screw 13 Terminal cover 13a Electric wire insertion hole 13b Driver insertion hole 13c Eaves projection 13d Guard rib 15 Box 18 Countersunk screw

Claims (3)

[Claims] 1. A terminal device for turning a terminal for crimp terminal wiring, which is standard equipment of an electric appliance, for direct wiring of an electric wire, wherein a screw hole for a crimp terminal wiring drawn out to a terminal portion of an appliance case. A rectangular cylindrical box for direct wiring having screw holes formed on the top and bottom surfaces is superimposed on the terminal plate with a screw, and screws are passed through screw holes on the bottom side of the box and fastened to the terminal plate. The wire of the wire inserted into the box is pressed and connected between the terminal screw screwed into the screw hole on the top side of the box and the bottom of the box, and a terminal cover is attached to the terminal part covering the terminal plate and the box. A terminal device for an electric appliance, comprising: 2. The terminal device according to claim 1, wherein the terminal cover is a resin molded product having an electric wire insertion hole on the front surface and a driver insertion hole on the upper surface, and a peripheral area of the electric wire insertion hole on the front surface of the cover. A terminal device for an electric appliance, wherein an eave-shaped projection extending forward along the edge is formed. 3. The terminal device according to claim 1, wherein the terminal cover is a resin molded product having an electric wire insertion hole on the front surface and a driver insertion hole on the upper surface, and the inside of the electric wire insertion hole opened on the front surface of the cover. A terminal device for an electric appliance, wherein a detachable arch-shaped guard rib extending across the hole is formed.