JP2007213963A - Terminal device of electric appliance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal device of an electric appliance improved in a terminal cover and its mounting structure to improve wiring workability of wires in addition to omission prevention of box terminals. <P>SOLUTION: This terminal device of an electric appliance is equipped with terminal plates 2 in a terminal block 12 of a body case 1 partitioned by right and left inter-phase barrier walls 11, the box terminals 3 with screws for inserting and fastening wires connected to the terminal plates, and a terminal cover 4 made of a mold resin and covering the front surface and the upper surface of the terminal block. On the back side of a front wall of the terminal cover, a terminal holding frame 44 for fitting and holding the box terminals at predetermined positions to match wire insertion holes 45 opened on the wall are arranged by integrally molding them; and engagement claws 47 are formed at the lower end of the terminal cover, and are engaged with engagement grooves 14 of the body case at the mounting position. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a terminal device for an electric appliance, which is an electromagnetic switch or an auxiliary relay (thermal relay) that is attached to and used with the electromagnetic switch.

As a terminal device for wiring electric wires in the above mentioned electric appliances, terminal screws or terminal plates that are screwed directly to the terminal plate on the appliance side according to the connection form of the electric wires (with crimp terminals or wire) are used. Made of an insulator (mold resin) so as to cover the front and top surfaces of the terminal block as a measure to prevent electric shock of the terminal (charged part) after having the terminal terminal fittings for fastening the electric wires inserted from the front in combination A terminal cover is attached (for example, see Patent Document 1), and this terminal cover is detachably locked to the main body case (for example, see Patent Document 2).
JP 2002-170605 A JP 2002-163972 A

  By the way, the above-described conventional terminal device has the following problems in terms of wiring workability.

  That is, in the terminal structure disclosed in FIG. 1 of Patent Document 1, when the box terminal is adopted, it is necessary to fix the box terminal to the terminal plate with another screw, which takes time and labor for assembling. Further, in the structure in which the box terminal is loosely fitted and held on the terminal plate as shown in FIG. 8 of the same document, if the terminal cover is removed during wiring work with the box terminal screw loosened, the installation posture of the electric appliance (vertical Depending on the orientation, the box terminal may accidentally fall off the terminal board and fall off.

  The same wiring workability problem as described above also occurs in the terminal cover device disclosed in Patent Document 2.

  The present invention has been made in view of the above points, and its object is to solve the above-mentioned problems caused by the conventional structure, and to prevent the terminal of the box terminal from dropping and to improve the wiring workability and the mounting structure thereof. It is an object of the present invention to provide a terminal device for an electric appliance which is improved.

In order to achieve the above-described object, according to the present invention, a terminal plate of a main body case in which the left and right sides are separated by a phase interval wall, a box terminal with a screw for inserting and fastening an electric wire connected to the terminal plate, and a terminal block In the terminal device of an electric appliance equipped with an inverted L-shaped terminal cover made of molded resin covering the front and upper surfaces,
On the back side of the front wall of the terminal cover, a terminal holding frame for fitting and holding the box terminal in a predetermined position is integrally formed in accordance with the electric wire insertion hole opened in the wall (Claim 1). Assume that the following structure is added.
(1) An engagement claw for preventing the terminal cover from being locked to the case at the mounting position on the instrument body case is provided at the lower end of the front wall of the terminal cover.
(2) The upper wall of the terminal cover is connected to the upper edge of the front wall via a folding hinge.

According to said structure, there exists the following effect. That is,
(1) The box terminal holding frame is integrally molded on the terminal cover, and the box terminal is fitted and held here, so that even if the terminal cover is removed during wiring work, the box terminal will be accidentally dropped and lost. Can be prevented.
(2) In addition, an engagement claw is provided at the lower end of the terminal cover, and the terminal cover is stably held in place without rattling by engaging the engagement claw on the body case side at the mounting position on the instrument body case. Can be fixed well.
(3) Further, the upper wall of the terminal cover is structured to be connected to the upper edge of the front wall through a bending hinge using the elasticity of the resin. With the upper wall standing upright, the box terminal is inserted into the holding frame on the back of the front wall, and then the upper wall is returned to the side so that the box terminal can be handled with the terminal cover while being held in place. be able to.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on the examples shown in FIGS. In each figure, 1 is a main body case of an electric appliance (an attached thermal relay of an electromagnetic switch), 2 is a terminal board of a three-phase main circuit incorporated in the main body case 1, and 3 is an electric wire (not shown). Box terminals 4 and 4 are terminal covers that cover the front and upper surfaces of the terminal block 12.

  Here, a terminal block 12 in which the left and right sides are partitioned by a phase interval wall 11 is formed at the end of the main body case 1, and the tip of the terminal plate 2 is drawn on the terminal block 12. The box terminal 3 has a structure similar to that disclosed in the above-mentioned Patent Document 1, and includes a box 31 made of a conductive material and a fastening screw 32 with a washer screwed to the top of the box 31. The wire of the electric wire inserted into the box 31 from the front at this position is loosely fitted to the tip of the terminal plate 2 and fastened with screws 32 to be clamped and fixed between the terminal plate 2.

  On the other hand, the terminal cover 4 of the molded resin molded product is composed of a front wall 41 covering the front of the terminal block 12 and an upper wall 43 connected to the upper edge of the front wall 41 via a bending hinge 42 utilizing the elasticity of resin. On the back side of the front wall 41, a box terminal holding frame 44 is integrally formed to fit and hold the box terminals 3 for three phases side by side. Here, wire insertion holes 45 leading to the box terminals 3 of the respective phases are opened side by side on the front wall 41, and further, an engagement protrusion 46 is provided at the middle position of the left and right side edges, and a bifurcated engagement is provided at the lower end. A nail 47 is formed. Further, a screw operation hole 48 corresponding to the fastening screw 32 of the box terminal 3 is opened in the upper wall 43, and an engaging claw 49 is formed at the rear edge. Further, corresponding to the engaging protrusions 46 and the engaging claws 47, engaging grooves 13 and 14 are formed in the front case of the phase interval wall 11 and the bottom of the terminal block 12 in the body case 1 of the instrument. .

  In the above configuration, when wiring an electric wire (element wire) using the box terminal 3, the terminal cover 4 is removed from the main body case 1, and the upper wall 43 is erected upward as shown in FIG. In this state, the box terminal 3 of each phase is inserted into the box terminal holding frame 44 from above, and then the upper wall 43 is tilted sideways as shown in FIG. Hold to not.

  Next, the terminal cover 4 is pushed and attached between the phase interval walls 11 of the main body case 1 from the front, and the box 31 of the box terminal 3 held by the holding frame 44 is inserted into the tip of the terminal plate 2 at this attachment position. The engaging protrusion 46 is press-fitted into the engaging groove 13 of the phase interval wall 11, and the engaging protrusion 47 at the lower end is engaged with the engaging groove 14 on the case side. At the same time, an engaging claw 49 provided on the rear edge of the upper wall 43 is click-coupled to the main body case 1 and fixed in place. As a result, the terminal cover 3 is supported to be stably prevented from coming off from the main body case 1 without rattling.

  In order to connect the electric wire in this terminal assembly state, the wire of the electric wire is inserted from the front through the hole 45 opened in the front wall 41 of the terminal cover 4 and inserted into the box 31 of the box terminal 3, and the upper wall 43 is opened. The fastening screw 32 of the box terminal 3 is tightened with a screwdriver (driver) inserted into the hole 48 so that the electric wire is clamped and fixed to the terminal plate 2.

  If the terminal cover 4 is removed from the main body case 1 with the wires disconnected, the box terminal 3 is pulled out from the terminal plate 2 together with the terminal cover 4 while being held by the holding frame 44. There is no risk that the terminal 3 will accidentally fall off.

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 a perspective rear view of the terminal cover showing the state which fitted and held the box terminal. It is explanatory drawing of the attachment structure of the terminal cover in FIG. 1, (a) is a front view of a terminal cover, (b) is a front view sectional drawing of the terminal base part of a main body case. 1 is an external perspective view of an electric appliance in which the terminal device of FIG. 1 is assembled.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body case of an electric appliance 11 Phase spacing wall 12 Terminal block 2 Terminal board 3 Box terminal 4 Terminal cover 41 Front wall 42 Bending hinge 43 Upper wall 44 Box terminal holding frame 45 Electric wire insertion hole 47 Engagement claw

Claims (3)

A terminal board on the terminal block of the main body case with the right and left walls separated by phase spacing walls, a screw box terminal to insert and fasten the wires connected to the terminal board, and an inverted L-shaped terminal cover made of molded resin that covers the front and top surfaces of the terminal block In the terminal device of an electric appliance equipped with
A terminal device for an electric appliance, wherein a terminal holding frame for fitting and holding a box terminal is integrally formed on the back side of the front wall of the terminal cover in accordance with an electric wire insertion hole opened in the wall. The terminal device according to claim 1, wherein an engagement claw portion for preventing the terminal cover from engaging with the case is provided at a lower end portion of the front wall of the terminal cover at a mounting position on the main body case. Equipment terminal device. The terminal device according to claim 1, wherein the upper wall of the terminal cover is connected to the upper edge of the front wall via a bending hinge.

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