JPH05250977A - Circuit breaker terminal block mounting structure - Google Patents

Abstract

(57) [Abstract] [Purpose] As a terminal block mounting structure for mounting a signal line terminal block having a wall surface to be brought into contact with the outer surface of the circuit breaker body case, the installation work time is short, Also, the present invention provides a mounting structure in which the terminal block, body case, and other members are less likely to be damaged by the force when the external electric wire is screwed and connected to the terminal block. [Constitution] An L-shaped projection 2c protruding toward the side surface of the case 1 is formed on a wall surface 2d of the terminal block 2, and a groove for fitting the L-shaped projection 2c is formed on the case 1 or the cover 5 to form an L-shape. The protrusion 2c is hooked on the side wall of the case 1 and pressed by the cover 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for a signal line terminal block attached to a circuit breaker such as an earth leakage breaker or a wiring breaker, and more specifically, a constituent member of the circuit breaker. The present invention relates to a terminal block mounting structure for mounting a terminal block having a wall surface to be brought into contact with the outer surface on the outer surface of a box-shaped case in which one end surface is opened.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a conventional terminal block mounting structure. A recess 1a having a dovetail-shaped cross section is formed on the side wall of the case 1 of the circuit breaker body, which is made of a casting resin and has one end face opened, in which the constituent members of the circuit breaker are accommodated. Convex portion 2a closely fitted in 1a
Is formed on the wall surface 2d of the terminal block to be brought into contact with the side wall of the case 1, the convex portion 2a is fitted into the concave portion 1a of the case 1, and then the plate-shaped terminal block stopper 3 is applied to the bottom surface of the case 1,
The rectangular protrusion 3b is displaced so as to be inserted into the square hole 2b of the terminal block 2, and the tapping screw 4 is screwed into the bottom surface of the case 1 through the hole 3a of the terminal block fixing metal fitting 3 so that the terminal block fixing metal fitting 3 is attached to the bottom surface of the case 1. Then, the terminal block 2 is attached to the outer surface of the case 1. The groove 1d of the case 1 communicates to the circuit breaker a signal for communicating the open / closed state of the circuit breaker or operating the circuit breaker from the outside through the notch 1b formed in the open end surface of the side wall of the case 1. It is a groove for crawling the signal line to be transmitted, and the end of the signal line crawling along this groove on the outside of the circuit breaker is a hollow recess not shown formed by partially forming the wall surface 2d of the terminal block 2 It is inserted in the plug-in terminal that is connected to the terminal of the terminal block, which is fixed to. In addition, the same figure (a)
Reference numeral 5 indicates a cover of the circuit breaker body for closing the open end surface of the case 1.

[0003]

The terminal block mounting structure as described above has the following problems. (1) To mount the terminal block, insert the dovetail-shaped convex part on the wall surface of the terminal block into the dovetail-shaped concave part on the side wall of the case, insert the terminal block stopper projection into the terminal block hole, and screw in the tapping screw. Work is required and it takes time to install.

(2) The axial force of the screw is applied to the terminal block when tightening the screw when connecting the external electric wire to the terminal block, and this force is further applied to the terminal block stopper. In order to minimize the screwing work, the number of tapping screws to be fixed to the bottom of the case of the main body is the minimum number that can hold the fixed state of the terminal block stopper, that is, two. There was some concern about the tapping screw being pulled out because the material was a viscoelastic thermoplastic resin.

(3) Since the fitting position of the dovetail-shaped convex portion and the concave portion is on the bottom surface side of the breaker main body case, the force of the terminal block attempting to open from the side surface of the case at the time of screw tightening work on the terminal block. Since the dovetail has a small taper, a large force is applied to the tapered surface, and there is concern that the dovetail may be deformed or missing. An object of the present invention is to significantly reduce the installation work time when installing the terminal block on the side surface of the case of the circuit breaker main body, and to prevent deformation and damage of each member due to force during screwing work on the terminal block. Is to provide a terminal block mounting structure.

[0006]

In order to solve the above-mentioned problems, in the present invention, the outer surface of the box-shaped case in which the constituent members of the circuit breaker are accommodated and one end surface of which is open is provided. A terminal block mounting structure for mounting a terminal block having a wall surface to be brought into contact with the terminal block, wherein at least two L-shaped projections are formed on the wall surface of the terminal block and project toward the side wall of the case. A groove, which is fitted almost intimately with the side of the projection on the wall surface side of the terminal block, is formed on the cover end that closes the open end surface of the case or the open end surface of the case side wall
Hook the L-shaped projection on the wall surface of the terminal block to the open side end surface of the case side wall, or insert it into the groove on the open side end surface of the case side wall and hook it on the side wall of the case, then press the L-shaped projection with the cover to hold the terminal. The table will be attached to the side of the case.

[0007]

[Operation] When the terminal block mounting structure is formed in this way,
The position of the L-shaped protrusion formed on the wall surface of the terminal block is above the wall surface of the terminal block (near the open end surface of the case), and there are at least two formation points. The resistance against the force of opening from the side becomes large, and the resistance against the force of twisting the terminal block when tightening the terminal screw at the end of the terminal block also becomes large. The anxiety of is eliminated, and the screwing work on the terminal block can be performed without anxiety. Further, since the work of attaching the terminal block is only a work of hooking the L-shaped projection on the side wall of the case and pressing it with the cover, the work time is greatly shortened.

In the present invention, at least two L-shaped protrusions are formed, but it is not impossible to form one L-shaped protrusion to have a long rail shape. But,
At this time, the length of the rail is about the same as the width of the terminal block, so the gap when pressing this protrusion with the cover also becomes longer, and dust that easily enters the case from the outside enters the case. It is not preferable to reduce the amount. Therefore, it is desirable to make the thickness of the L-shaped projections formed by two or more as thin as possible, and the strength of the L-shaped projections is reduced by filling the thermoplastic resin forming the terminal block with a reinforcing material such as glass fiber. Try to make up for it.

[0009]

FIG. 1 shows an embodiment of the present invention. In the figure, members or parts corresponding to those in FIG. Two L-shaped projections 2c each having a rectangular cross section are formed above the terminal block wall surface 2d that is in contact with the side surface of the case 1, and the cover 5 has substantially the same shape as the side of the L-shaped projection 2c on the terminal block wall surface 2d side. A groove 5a is formed which is closely fitted. In addition, the dovetail-shaped recess 1a on the side surface of the case 1 and the terminal block 2
The square hole 2b is left so that the case and the terminal block according to the present invention can be used as spare parts for a circuit breaker that is already in use.

The terminal block 2 is attached to the side surface of the case 1 by hooking the L-shaped projection 2c of the terminal block 2 on the open side end surface of the side wall of the case 1 and connecting it to the side of the terminal wall surface 2d side of the L-shaped projection 2c. This is performed by fitting the cover 5 into the groove 5a and fixing the cover 5 to the case 1. In this embodiment, the groove to be fitted with the L-shaped projection is formed on the cover 5, but this groove is formed on the end face on the open end side of the side wall of the case 1 to form the L-shaped projection on the flat surface of the cover 5. You may make it hold down on the surface.

[0011]

As described above, according to the present invention, the wall surface of the box-shaped case, in which the constituent members of the circuit breaker are accommodated and whose one end surface is opened, is provided with the wall surface to be brought into contact with the outer surface. A terminal block mounting structure for mounting a terminal block is provided, wherein at least two L-shaped projections are formed on the wall surface of the terminal block so as to project toward a side wall of the case, and the L-shaped projections on the wall surface side of the terminal block. Is formed in the cover closing the open end surface of the case or the open side end surface of the case side wall, and the L-shaped projection of the terminal block wall surface is hooked on the open side end surface of the case side wall, or When the terminal block is inserted into the groove on the side wall open side end and hung on the side wall of the case, the L-shaped protrusion is pressed by the cover to attach the terminal block to the side surface of the case, so when connecting the external wire to the terminal block. When tightening the screw Drag is increased to a force to be to force or terminal block screw so open the casing side,
It is now possible to perform screw tightening without worrying about damage to members that receive the force at the time of screw tightening. Also, since the terminal block installation does not involve screw tightening work, it is possible to greatly reduce the installation work time.

[Brief description of drawings]

1A and 1B are views showing an embodiment of a terminal block mounting structure according to the present invention, in which FIG. 1A is an external perspective view of a circuit breaker, FIG. 1B is a front perspective view of a terminal block, and FIG. Figure (c) is a rear perspective view of the terminal block, and Figure (d) is a partial sectional view after the terminal block is attached.

2A and 2B are views showing an example of a conventional terminal block mounting structure, in which FIG. 1A is an external perspective view of a circuit breaker, FIG. 2B is a front perspective view of the terminal block, and FIG. ) Is a rear perspective view of the terminal block, and (d) is a perspective view of the terminal block stopper.

[Explanation of symbols]

 1 case 2 terminal block 2c protrusion (L-shaped protrusion) 2d wall surface 5 cover

Claims (1)

[Claims] 1. A terminal block mounting structure for mounting a terminal block having a wall surface to be brought into contact with the outer surface on an outer surface of a box-shaped case in which constituent members of a circuit breaker are accommodated and one end surface of which is open. At least two L-shaped projections projecting toward the side wall of the case are formed on the wall surface of the terminal block, and the L-shaped projections are fitted to the side of the terminal block wall surface side in a substantially close fit. A groove is formed in the cover that closes the open end surface of the case or in the open side end surface of the case side wall, and the L-shaped protrusion on the terminal block wall surface is hooked on the open side end surface of the case side wall or inserted into the groove of the case side wall open side end surface. Then, the terminal block mounting structure of the circuit breaker is characterized in that the terminal block is mounted on the side surface of the case by pressing the L-shaped protrusion with the cover after being hooked on the side wall of the case.