JP3365349B2 - Method for manufacturing resin wiring box - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a resin wiring box.

[0002]

2. Description of the Related Art A conventional resin wiring box (hereinafter, simply referred to as a box body) generally has a rectangular bottom portion and side walls provided upright on four sides thereof. One side of the box is open, and a plate member such as a wiring device attachment frame is attached to this opening. A screw insertion portion is provided on the inner surfaces of the pair of opposing side walls, and a male screw member for mounting the plate member can be inserted therein. Further, a female screw member that is screwed with the male screw member is embedded inside the screw insertion portion.

In the above-mentioned resin wiring box,
After resin molding the box body, insert the female screw member from the hole formed in the box body into the screw insertion part using an elongated jig, push it to the specified position, and then embed and fix it by ultrasonic welding. There is.

[0004]

However, in the method of manufacturing the resin wiring box having the above-described structure, the outer circumference of the female screw member is simply welded to the inner circumference of the screw insertion portion. It has a problem that it is weak against the pressing force in the axial direction. Therefore, if a force in the direction opposite to the insertion direction is applied to the female screw member, it may fall off, or when the male screw member is screwed onto the female screw member when mounting the plate, the female screw member is pushed by the male screw member. There was a case to fall off. Also,
In a fixing method using a method involving heating, such as ultrasonic welding, the shape of the portion where the female screw member is placed is generated because it causes thermal deformation in the portion where the female screw member is to be positioned. May become unstable, and the positioning accuracy of the female screw member may be impaired.

The present invention has been made in view of the above problems, and an object thereof is to prevent the female screw member from falling off without deteriorating the positioning accuracy of the female screw member. Another object of the present invention is to provide a method for manufacturing a resin wiring box.

[0006]

The invention according to claim 1 is
A male threaded member for mounting the plate member is provided so that it can be inserted therethrough, and a female threaded member that can be screwed into the male threaded member is provided inside, and an inner side from the outside of the threaded insertion section. A box body having a female screw member insertion hole communicating in one direction, and the female screw member disposed at a predetermined position inside the screw insertion portion from the female screw member insertion hole , the screw A female screw member can be supported in the middle of the insertion part
The box is formed with a supporting part that becomes a concave part of a size of
A female screw member that leads from the outer surface of the side wall of the main body to the support
An insertion hole is formed through this female screw member insertion hole.
A method for manufacturing a resin wiring box in which the female screw member is disposed on the same support portion at a fixed position, the first step of resin-molding the box body, and the female screw member insertion hole. Through the second step of arranging the female screw member at a predetermined position, and the third step of forming a protrusion engaging with the side surface of the female screw member in the female screw member insertion hole without heating. Contact a
The protrusions are formed on the inner wall surfaces on both sides of the female screw member insertion hole.
The female screw member on the opening side of the female screw member insertion hole.
Supporting part where this female screw member becomes a concave part
And it is characterized in Rukoto is sandwiched by the projection inside.

According to a second aspect of the present invention, in the method of manufacturing a resin-made wiring box according to the first aspect, in the third step, the protrusion is formed by externally pressing and deforming a part of the screw insertion portion. It is characterized by forming a part.

According to a third aspect of the present invention, in the method of manufacturing a resin-made wiring box according to the first aspect, in the first step, a protruding piece that does not hinder the insertion of the female screw member is provided on the inner wall of the female screw member insertion hole. The third step is characterized in that the protrusion is formed by pressing and deforming the protruding piece in the female screw direction.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A method for manufacturing a resin wiring box according to an embodiment of the present invention will be described below in detail with reference to FIGS.

The box body 1 has a bottom portion 5 to which wiring equipment and the like are attached, and a pair of opposing long side wall portions 6 and 7,
It has a pair of short side wall portions 8 and 9 facing each other. Each of these four side wall portions is erected from the peripheral edge of the bottom portion 5. A plurality of elongated screw insertion holes 10 are formed on the long side wall portions 6 and 7 so as to face each other. Further, two knockouts 11 for passing an electric wire are formed on the short side wall portions 8 and 9. Furthermore, the short side wall portion 8,
Each of the inner surface sides of 9 has a cylindrical screw insertion portion 12, 13 for attaching a plate member such as a wiring device attachment frame.
Are formed so as to project inward.

A support portion 19 is formed in the middle of each of the screw insertion portions 12 and 13. As shown in FIG. 3, the support portion 19 is formed to support a female screw member 21 including a nut or the like that is screwed into a screw member 20 inserted into the screw insertion portions 12 and 13, and The recess is a size large enough to support the screw member 21. A space A is provided below the support portion 19.

The short side wall portions 8 and 9 are formed with female screw member insertion holes 22 which communicate from the outer surface side to the support portions 19 in the screw insertion portions 12 and 13, and the inner wall surface of the female screw member insertion hole 22. The projection 23 formed by the method described later is formed so as to engage with the end of the female screw member 21 on the opening side of the female screw member insertion hole 22. With such a structure, the female screw member 21 is inserted from the female screw member insertion hole 22 into the screw insertion portion 1
It is embedded in the two and thirteen.

With the above-described structure, the female screw member 21 is firmly sandwiched by the protrusions 23, and even if an unexpected force is applied to the female screw member 21 in the direction opposite to the inserting direction, the female screw member 21 will be It does not come off from the protrusion 23.
Therefore, when the male screw member 20 is screwed into the female screw member 21 when the plate is attached, even if the female screw member 21 is pushed by the male screw member 20, the female screw member 21 does not come out. Further, since the rotation of the female screw member 21 is completely suppressed in the female screw member insertion hole 22, when the male screw member 20 is screwed, the female screw member 21 does not rotate in accordance therewith, and the male screw member 21 does not rotate. It is possible to easily screw the screw member 20.

Next, a method of manufacturing the resin wiring box according to this embodiment will be described. First, in the first step, the box body 1 is resin-molded. Next, in the second step, when the shape of the box body 1 is hardened / stabilized by cooling, the female screw member 21 is arranged at a predetermined position through the female screw member insertion hole 22. At this time, when the shape of the female screw member insertion hole 22 becomes stable, the female screw member 2
Since 1 is provided, the positioning is accurately performed. Further, since the inner surface of the female screw member insertion hole 22 does not have a convex portion or the like that engages with the female screw member 21, the insertion thereof is not hindered, and the female screw member 21 can be easily arranged at a predetermined position. It becomes possible to do.

Then, in the third step, the protrusion 23 is formed on the inner surface of the female screw member insertion hole 22 of the box body 1 without heating. In the present invention, since the heat treatment is not performed when forming the protrusion 23, the protrusion 23
Since there is no problem that the shape other than the above, particularly the shape of the portion where the female screw member 21 is to be positioned is deformed by heating and the shape becomes unstable, the positioning accuracy of the female screw member 21 is not impaired.

For example, as shown in FIG. 4, the protrusion 23 is formed by pressing and deforming a part of the screw insertion portion 12 from the outside in the third step. That is, when the female screw member 21 is arranged at a predetermined position through the female screw member insertion hole 22 (see FIG. 4A), the processing pins 30, 3 are formed.
0 is applied to a part of the screw insertion portion 12 from the outside with a predetermined strength, that is, a strength such that the resin in a cooled and hardened state can be deformed and a through hole is not generated. And the inner wall of the female screw member insertion hole 22 is deformed to form the protrusions 23, 23 (FIG. 4B).
reference). At this time, it goes without saying that the protrusions 23, 23 are formed so as to engage with the end portions of the female screw member 21 provided. The protrusion 23 formed by the method described above,
The female screw member 21 is firmly held in the female screw member insertion hole 22 by 23 (see FIG. 4C). In this method, the box body 1 of the first step
Since it is not necessary to previously provide a structure for forming the protrusion 23 in the female screw member insertion hole 22 at the time of molding, the protrusion 23 can be easily generated.

As shown in FIG. 5, the protruding portion 23 may be formed by pressing and deforming the protruding piece 23a provided on the inner wall of the female screw member insertion hole 22 in advance. That is, in the first step, projecting pieces 23 a, 23 a projecting in the opening direction of the female screw member insertion hole 22 are formed on the inner wall of the female screw member insertion hole 22 in advance so as not to interfere with the insertion of the female screw member 21. Every other time (see FIG. 5A), in the third step, the projecting pieces 23a, 23a are deformed by applying pressure in the direction of the female screw member 21 by the processing jig 31 inserted into the female screw member insertion hole 22. This forms the protrusions 23, 23 (see FIG. 5B). The female screw member 21 is firmly sandwiched in the female screw member insertion hole 22 by the protrusions 23, 23 formed by the method described above (see FIG. 5C). In this method, the female screw member insertion hole 2
Since the deformed portion is pressed and deformed in 2 and the deformed portion is inconspicuous, it is possible to manufacture the resin wiring box without impairing the aesthetic appearance. In addition, since the female screw member 21 is pressed and deformed by the processing jig 31 toward the inner part of the female screw member insertion hole 22, the second screw member 21 is temporarily moved.
In the process of, the female screw member 21 is inserted into the female screw member insertion hole 22.
Even if the female screw member 21 is not arranged at the predetermined position, it can be corrected to the predetermined position in the third step, and the positioning accuracy of the female screw member 21 can be improved.

[0018]

As described above, according to the first aspect of the present invention, the female screw member for attaching the plate member is provided so that it can be inserted therethrough, and the female screw member can be screwed into the male screw member inside. A box body having a screw insertion part in which a screw member is disposed and a female screw member insertion hole communicating from the outside to the inside of the screw insertion part, and the screw insertion part from the female screw member insertion hole to the screw insertion part. A method for manufacturing a resin-made wiring box, comprising: the female screw member arranged at a predetermined inner position,
Accompanied by a first step of resin-molding the box body, a second step of arranging the female screw member at a predetermined position through the female screw member insertion hole, and heating of a protrusion engaging with a side surface of the female screw member. And the third step of forming the female screw member insertion hole without forming the female screw member, the female screw member is firmly clamped by the formed protrusion and is hardened when the protrusion is formed. Since the shape of the portion where the female screw member is desired to be positioned is not made unstable by reheating the female screw member insertion hole in a stable state, the female screw member can be positioned without deteriorating the positioning accuracy of the female screw member. It is possible to provide a method for manufacturing a resin-made wiring box that can prevent the falling of the wiring box. Therefore, the female screw member does not fall off, and the plate member can be securely screwed into the resin wiring box. Further, since it is not necessary to prevent the female screw member from coming off with a configuration other than the protrusion formed in the third step, the female screw member can be easily arranged in the second step. Especially in this case, in the middle of the screw insertion part
Has a recess large enough to support the female screw member
The support part is formed, and from the outer surface side of the side wall part of the box body
A female screw member insertion hole leading to the support portion is formed,
From this female screw member insertion hole to the same position at the support
A female screw member is provided, and the protrusion is a female screw.
Formed on both inner wall surfaces of the female member insertion hole,
It engages with the end portion on the opening side of the female screw member insertion hole,
This female screw member is formed as a recess in the support portion by the protrusion.
Since it is clamped, the female screw member can be positioned accurately.
Even if the female screw member is pushed by the male screw member,
The member does not come out.

According to the invention of claim 2, claim 1
In the method for manufacturing a resin-made wiring box described, in the third step, since the protrusion is formed by pressing and deforming a part of the screw insertion portion from the outside,
Since it is not necessary to provide a structure for forming the protrusion when the box body is molded, it is possible to simply manufacture the protrusion.

According to the invention of claim 3, claim 1
In the resin wiring box manufacturing method described above, in the first step, a protruding piece that does not hinder the insertion of the female screw member is formed on the inner wall of the female screw member insertion hole, and in the third step,
Since the protrusion is formed by pressing and deforming the protruding piece in the female screw direction, the pressing deformation is performed in the female screw member insertion hole. It is possible to manufacture a resin wiring box without exposing the appearance of the resin.

[Brief description of drawings]

FIG. 1 is a perspective view of a resin wiring box according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a resin wiring box.

FIG. 3 is a partial cross-sectional view of a resin wiring box.

FIG. 4 is a partial cross-sectional view of a female screw member insertion hole showing a method for manufacturing a protrusion, (a) shows a state in which a female screw is inserted,
(B) shows a state in which a protrusion is formed, and (c) shows a state after the protrusion is formed.

5A and 5B are partial cross-sectional views of a female screw member insertion hole showing another method for manufacturing a protrusion, in which FIG. 5A shows a state in which a female screw is inserted, and FIG. 5B shows a state in which a protrusion is formed. (C) shows the state after the protrusion is formed.

[Explanation of symbols]

1 box body 12 screw insertion part 13 Screw insertion part 20 Male screw member 21 Female screw member 22 Female screw member insertion hole 23 Projection

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-28017 (JP, A) JP-A-11-136832 (JP, A) JP-A-10-12292 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) H02G 3/12

Claims (3)

(57) [Claims] 1. A screw insertion part in which a male screw member for mounting a plate member is inserted, and a female screw member that can be screwed into the male screw member is disposed inside the screw insertion part, and the screw insertion part. Female screw member insertion hole communicating from the outside to the inside,
A box body having said and a said female screw member disposed at a predetermined position of the inside of the female screw member insertion hole the screw inserting portion, supports the female screw member in the middle of the screw insertion portions To what extent
The box body is formed with a supporting part that becomes a recess of the size
Insertion of female screw member that leads to the support from the outer surface of the side wall
A hole is formed, and the female screw member insertion hole
A method of manufacturing a resin-made wiring box in which the female screw member is disposed on the same supporting portion as a storage device, which comprises a first step of resin-molding a box body and a predetermined female screw member through a female screw member insertion hole. a second step of disposing the position, and and a third step of forming the female screw member insertion hole without heating the projections to be engaged with the side surface of the female screw member, the butt Parts are formed on both inner wall surfaces of the female screw member insertion hole.
Engage the end of the female screw member on the opening side of the female screw member insertion hole.
In the support part where this female screw member becomes a recess.
A method of manufacturing a resin wiring box, wherein the resin wiring box is sandwiched by the protrusions . 2. The resin wiring box according to claim 1, wherein in the third step, a protrusion is formed by externally pressing and deforming a part of the screw insertion portion. Production method. 3. In the first step, a projecting piece that does not hinder the insertion of the female screw member is formed on the inner wall of the female screw member insertion hole, and in the third step, the projecting piece is formed in the female screw direction. The method of manufacturing a resin wiring box according to claim 1, wherein the protrusion is formed by pressing and deforming.