JP3557879B2 - Case wall punching structure - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a structure for punching a wall of a case, and more particularly, to a structure for punching a punching portion for inserting an electric wire formed in a wall of a case such as a distribution board as necessary. The present invention relates to a technology for storing a bushing to be mounted.
[0002]
[Prior art]
Generally, in the case of a distribution board for a house, in order to connect a plurality of branch switches housed in the case of the distribution board and an external load, only necessary positions are punched out when necessary. Punching portions are formed throughout the bottom surface and side surfaces of the case.
[0003]
By the way, a plurality of punching portions are juxtaposed on a wall of a case via a punching cutout portion, and punching a punching portion at a necessary portion and mounting a bushing for electrical insulation in the punching hole. .
[0004]
[Problems to be solved by the invention]
By the way, the bushing had to be stored separately, and the bushing was easily lost. Further, at the construction site, it is necessary to perform an operation of attaching a bushing to the punched hole in addition to punching the punched portion, and the workability is also low.
The present invention is intended to solve such a problem, and by effectively using the configuration of the punching portion by a simple improvement of the punching portion, the bushing can be stored, the bushing is prevented from being lost, and at the construction site Eliminates the work of installing the bushing, and furthermore, the wire inserted into the punched hole by the burr without the burring when punching out the punched hole coming out on the inner surface of the bushing while the bushing is pre-installed It is an object of the present invention to provide a structure for punching a wall of a case without fear of damaging the coating of the case.
[0005]
[Means for Solving the Problems]
A punching structure for a wall of a case, wherein a punching portion 2 for inserting an electric wire is formed in a wall 3 of a case 1 through a punching cutout portion 4, wherein the punching portion 2 and the wall except the punching cutout portion 4 are provided. 3, a slit S is formed between the slit 3 and a bushing B remaining at the edge of the punched hole 7 from which the punched portion 2 has been punched is engaged with the slit S and mounted on the wall 3 side. It is.
[0006]
In the second aspect, and characterized in that formed by the punching part 2 and the walls 3 and the width W ₂ of the wall 3 side than the width W ₁ of the punched portion 2 side of the punched cut portion 4 connected to the small Is what you do.
(Action)
According to the first aspect, the bushing B is mounted on the slit S formed in the peripheral portion of the punched portion 2, so that the storage of the bushing B can be eliminated and the work of mounting the bushing B at the construction site can be eliminated. Can be enhanced.
[0007]
According to the second aspect, at the time of punching of the punching portion 2, the punching cut portion 4 is cut from the weak wall 3 side, so that the flash generated at the cut portion does not protrude from the inner surface of the bushing B, There is no possibility that the coating of the electric wire inserted into the bushing B may be damaged, and safety can be ensured.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a partially exploded perspective view before mounting a bushing B, FIG. 2 is a perspective view after mounting a bushing B, FIG. 3 is a perspective view after punching out a punching portion 2, and FIG. FIG.
[0009]
A plurality of punched portions 2 are formed on an upper wall 3 which is a peripheral side wall of a distribution board as an example of the case 1. The punched portion 2 may be formed on another side wall or the bottom wall 3. Case 1 need not be a distribution board.
On the wall 3 of the case 1, a plurality of, for example, circular punched portions 2 for inserting electric wires are juxtaposed. The punching portion 2 is connected to the wall 3 of the case 1 via punching cutouts 4 at both sides in the diameter direction. A slit S is formed between the punch 3 and the wall 3 excluding the punch cuts 4.
[0010]
The bushing B is formed in a circular shape from an electrically insulating material. In the bushing B, a flange portion Bb is formed on the front surface side, and a leg portion Ba is formed at an intermediate portion in the thickness direction of the flange portion Bb in the radial direction of the bushing B. Notches Bf, Bf are formed in the leg Ba on both sides in the radial direction of the bushing B.
Thus, the notches Bf, Bf of the bushing B straddle the punching cutouts 4, 4 and engage the bushing B with the slit S. In this case, the outer peripheral surface Bc of the leg Ba is formed on the wall 3. The hole edge of the punched hole 7 (slit S) is elastically contacted, and the inner peripheral surface Bd of the leg Ba is elastically contacted with the outer peripheral surface 2a of the punched portion 2.
[0011]
As described above, the bushing B remaining at the edge of the punching hole 7 from which the punching portion 2 has been punched is engaged with the slit S and mounted on the wall 3 side, thereby eliminating the storage of the bushing B. Then, by punching the punching portion 2 with a tool such as a screwdriver and cutting the punching cutouts 4 and 4, only the punching portion 2 formed in series on the wall 3 is punched, and the bushing B is placed on the wall 3 side. That is, the work of installing the bushing B at the construction site can be eliminated, and the workability can be improved.
[0012]
Incidentally, are the width W ₂ of the wall 3 side into small compared to the width W ₁ of the punched portion 2 side of the punched cut portion 4 which connects the punched portion 2 and the wall 3.
However, when the punching portion 2 is punched, the punching cutout 4 is cut from the weaker wall 3 side, so that the burrs generated at the cut portion do not protrude from the inner surface of the bushing B and the inside of the bushing B There is no danger of damaging the coating of the electric wire inserted through the cable, and safety can be ensured.
[0013]
Devices such as a breaker 6 and a distribution switch are housed and attached to a switchboard which is the case 1 via a support bar 5. A display plate 8 facing its handle is attached to the front side of the device block, an opening frame 9 is attached to the case 1, and a lid 11 is attached to the opening frame 9 via a hinge 10 so as to be openable and closable. .
[0014]
【The invention's effect】
In claim 1, a slit is formed between the punched portion except the punched cut portion and the wall, and a bushing remaining at the edge of the punched hole punched out of the punched portion is engaged with the slit and mounted on the wall side. Therefore, there is an advantage that work of attaching the bushing at the construction site can be eliminated while eliminating the storage of the bushing, thereby improving workability.
[0015]
In claim 2, the width of the wall 3 side is smaller than the width of the punched portion side of the punched cut portion connecting the punched portion and the wall. Since it is cut from the weaker wall side, the burrs generated at the cut point do not protrude from the inner surface of the bushing, and there is no risk of damaging the coating of the electric wire inserted into the bushing, and safety is improved. There is an advantage that it can be secured.
[Brief description of the drawings]
FIG. 1 is a partially exploded perspective view showing an embodiment of the present invention and before mounting a bushing.
FIG. 2 is a perspective view after a bushing is mounted.
FIG. 3 is a perspective view after punching out a punching portion.
FIG. 4 is an overall exploded perspective view.
FIG. 5 is an exploded perspective view in which a part is enlarged.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Case 2 Punching part 3 Wall 4 Punching cutting part 7 Punching hole B Bushing W ₁ Width of punching part side of cutting part W ₂ Width of punching cutting part at wall side

Claims (2)

A punching structure of a case wall in which a punching portion for inserting an electric wire is formed in a wall of the case through a punching cut portion, wherein a slit is formed between the punching portion except the punching cut portion and the wall, and the punching portion is formed. A punching structure for a wall of a case, wherein a bushing remaining at an edge of a punched punching hole is engaged with a slit and mounted on a wall side. 2. The case wall punching structure according to claim 1, wherein the width at the wall side is smaller than the width at the punching portion side of the punching cutting portion connecting the punching portion and the wall.

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