JP2006066287A - Terminal apparatus of electric appliance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve an assembly structure of a terminal apparatus so that the number of parts and assembly man days are reduced for the purpose of reduction in manufacturing cost. <P>SOLUTION: The terminal apparatus is constituted by attaching box terminals 2 with terminal screws 7, terminal plates 3 fixed to a terminal board by assembling to the box terminals and a terminal cover 5 covering a front surface and a top surface of the terminal board onto the terminal board 1b partitioned by interphase separating ribs 1a into right and left sides. Arm state supporting guides 3b are formed assembling the box terminals to both the right and the left sides of the terminal plates, the supporting guides of the terminal plates are pressurized into guide grooves formed on the interphase separating ribs of the terminal board in a state of the box terminal being fit into and held by the terminal plates, and the box terminal is pushed from the front to a fixed position by the terminal cover attached to the terminal board so as to be stably held. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a terminal device for an electric appliance, for example, a single installation unit for a thermal relay used in combination with an electromagnetic contactor.

The single installation unit described above is equipped with a thermal relay that is separated from the magnetic contactor and installed on the control panel, etc., and the wiring between the thermal relay and the magnetic contactor is provided via the terminal device installed on the unit. The conventional structure of the terminal device equipped in the unit is shown in FIGS. In the figure, 1 is a single installation unit, 2 is a box terminal, 3 is a terminal plate, 4 is a connection lead plate drawn from a thermal relay mounted on the installation unit 1, and 5 is a terminal cover.
Here, the single installation unit 1 is a cradle structure (resin molded product) on which a thermal relay (not shown) is placed, and U, V partitioned by a phase interval wall 1a at the upper part of the front wall which becomes a partition shape. , A terminal block 1b corresponding to the W phase is formed, and a terminal device is configured by mounting the box terminal 2, the terminal plate 3, the connection lead plate 4 and the terminal cover 5 as described later. As shown in FIG. 8, an engagement protrusion 1d and an urging spring 1e are mounted on the back side of the base of the installation unit 1 to lock and fix the unit to the support rail.

On the other hand, the box terminal 2 is a copper box whose front and rear surfaces are open, and a box fixing screw hole 2a and a terminal screw hole 2b are opened on the bottom and top surfaces thereof. The terminal cover 5 (resin molded product) has an inverted L shape covering the front and upper surfaces of the terminal block. The upper wall has an insertion hole 5a for a driver (screwdriver), and the front wall has the phase spacing wall 1a. A vertical groove is formed so as to escape, and a window hole 5b into which an electric wire (not shown) for external wiring is inserted is opened, and protrusions 5c formed on both the left and right sides are formed as described below. Are click-coupled to engagement grooves 1f formed in the phase spacing walls 1a on both the left and right sides of the left and right sides, and fixed to the terminal block.
Next, a method for assembling the terminal device will be described. First, as shown in FIG. 9, with the box terminal 2 superimposed on the terminal plate 3, the box fixing screw 6 is screwed into the screw hole 3a of the terminal plate to couple them together. A terminal screw 7 is screwed into the upper part.

Next, along the left and right side edges of the terminal board 3 along the guide groove 1c formed on the wall surface of the phase interval wall 1a of the installation unit 1 (the guide groove is formed between a pair of upper and lower rib-shaped protrusions formed on the partition wall surface). Then, after press-fitting from the front of the terminal block 1b and fixing it in place (see FIG. 6), when the terminal cover 5 is attached to the terminal block, the assembled state shown in FIGS.
Then, to mount the thermal relay on the installation unit 1 and to connect the magnetic contactor, the tip of the connection lead plate 4 drawn out from the thermal relay is placed behind the terminal block 1b as shown in FIG. From the front of the terminal block 1b through the window hole 5b of the terminal cover 5 to the box terminal 2 from the front of the terminal block 1b. The terminal screw 7 is inserted into the terminal 2 and tightened by tightening the terminal screw 7 with a screwdriver inserted through the hole 5a of the terminal cover 5 in this state.

As described above, the terminal device having the structure in which the box terminal 2 is stacked on the terminal plate 3 and both parts are connected by the box fixing screw 6 and mounted on the terminal block is other than the thermal relay single installation unit described above. However, it is well known and widely used in terminal devices of various electric appliances (see, for example, Patent Document 1).
JP 2002-170605 A

By the way, the above-described conventional terminal device has the following problems in terms of assemblability. That is, since the box fixing screw 7 is used as means for coupling the box terminal 2 to the terminal plate 3, there is a problem that the number of parts, parts processing and assembly man-hours increase, and the manufacturing cost increases.
Accordingly, an object of the present invention is to provide a terminal device having an improved assembly structure so that the number of parts and the number of assembly steps can be reduced with the aim of reducing manufacturing costs.

In order to achieve the above object, according to the present invention, a box terminal with terminal screws on a terminal block divided on the left and right sides by a phase interval wall, a terminal plate assembled to the box terminal and fixed to the terminal block, and a front surface of the terminal block , In a terminal device of an electric appliance having a configuration in which a terminal cover covering the upper surface is mounted,
Arm-shaped support guides for assembling box terminals are formed on both the left and right sides of the terminal plate, and the support guides are press-fitted into guide grooves formed on the phase interval walls of the terminal block with the box terminals fitted and held on the terminal plate. (Claim 1).
Further, in the above configuration, as a means for stably holding the box terminal in a fixed position, a holding guide is provided on the inner surface of the front wall of the terminal cover to press the box terminal into a fixed position at a position where the cover is mounted on the terminal block. (Claim 2).

  According to the above configuration, the box terminal can be assembled to the terminal board and attached to the terminal block by a simple fitting operation without using a fixing screw, thereby reducing the number of parts and assembly steps compared to the conventional structure. Thus, the manufacturing cost can be reduced.

Hereinafter, the embodiment of the present invention will be described based on the examples shown in FIGS. 1 to 5, taking as an example a terminal device applied to the single installation unit. In addition, in the figure of an Example, the same code | symbol is attached | subjected to the member corresponding to FIGS. 6-9, and the description is abbreviate | omitted.
That is, in the illustrated embodiment, the terminal plate 3 which is a component of the terminal device does not have a fixing screw hole, but instead is a pair of left and right arm-shaped supports that branch from the rear end of the terminal plate to the left and right and extend to the side edges. A guide 3b is formed. On the other hand, in the box terminal 2, a terminal screw 7 is screwed onto the upper wall of the box, and a washer 8 for holding an electric wire inserted into the box is loosely supported at the end of the terminal screw. Further, the terminal cover 5 is formed with a holding guide 5d for holding the terminal which becomes a rib-shaped protrusion in the vertical direction as shown in FIG.
In order to mount the box terminal 2, the terminal plate 3, and the terminal cover 5 on the terminal block 1b of the unit, first, the terminal plate 3 is fitted to the box terminal 2 from the arrow direction as shown in FIG. The left and right side walls of the box terminal are inserted between the side edge of the terminal plate 3 and the support guide 3b to be coupled. Next, the assembly of the box terminal 2 and the terminal plate 3 is inserted into the terminal block 1b from the front, and the support guides 3b formed on both sides of the terminal plate 3 are press-fitted into the guide grooves 1c formed on the wall surface of the phase interval wall 1a. The terminal plate 3 is fixed across the left and right partition walls. FIG. 2 shows an assembled state before the terminal cover 5 is attached. Subsequently, the terminal cover 5 is put on the terminal block, and the projections 5c on both sides thereof are click-coupled to the engaging grooves 1f formed on the phase interval wall 1a and fixed. When the terminal cover 5 is attached, as shown in FIG. 4, a holding guide 5d formed on the inner surface of the front wall of the terminal cover 5 abuts against the front surface of the box terminal 2 and presses the terminal into place. In this state, the box terminal 2 is movable in the vertical direction with respect to the terminal plate 3. During wiring, as in the case of FIG. 9, an external wiring wire (not shown) is connected to the box terminal 2 from the front and rear of the terminal block 1b. By tightening the terminal screw 7 after inserting the connection lead plate 4, the wiring is sandwiched between the terminal plate 3 and the washer 8 coupled to the terminal screw 7.

  In the illustrated embodiment, the terminal device provided in the single installation unit of the thermal relay is exemplified, but it is needless to say that the embodiment can be applied to terminal devices of various other electric devices.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the terminal device by the Example of this invention, (a) is a disassembled perspective view, (b) is explanatory drawing of the assembly method which assembles | attaches a terminal board to a box terminal. External perspective view showing the assembled state with the terminal board and box terminals attached to the terminal block FIG. 2 is an external perspective view showing an assembled state of the terminal device in which the terminal cover is mounted on the terminal block from the state of FIG. Vertical side view of FIG. Exploded perspective view showing the structure of a conventional terminal device FIG. 5 is an external perspective view showing an assembled state in which the terminal board and the box terminal are mounted on the terminal block in FIG. FIG. 6 is an external perspective view showing an assembled state of the terminal device in which the terminal cover is mounted on the terminal block from the state of FIG. Vertical side view of FIG. The perspective view of the state which connected the box terminal to the terminal board in FIG.

Explanation of symbols

1 Single installation unit (electric appliance)
1a Phase spacing wall 1b Terminal block 1c Guide groove 2 Box terminal 3 Terminal plate 3a Support guide 4 Connection lead plate 5 Terminal cover 5d Holding guide 7 Terminal screw

Claims (2)

An electric appliance comprising a terminal block with terminal screws on a terminal block that is divided by a phase interval wall, a terminal plate that is assembled to the box terminal and fixed to the terminal block, and a terminal cover that covers the front and top surfaces of the terminal block In the terminal device of
Arm-shaped support guides for assembling box terminals are formed on both the left and right sides of the terminal plate, and the support guides are press-fitted into guide grooves formed on the phase interval walls of the terminal block with the box terminals fitted and held on the terminal plate. A terminal device for an electric appliance, characterized by being fixed. 2. A terminal device according to claim 1, wherein a holding guide is provided on the inner surface of the front wall of the terminal cover to hold the box terminal in place at a position where the cover is mounted on the terminal block.

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