JP5075546B2 - Wiring box - Google Patents

Description

  The present invention relates to a wiring box having a screw holding portion.

  A lightweight partition wall as a wall of a building is constructed by erecting a light-weight shaped steel material and erecting a wall material (for example, a gypsum board) so as to sandwich the light-weight shaped steel material. The lightweight partition wall has a hollow portion formed between the pair of wall materials, and the lightweight partition wall is a hollow wall. In order to install the wiring device on the lightweight partition wall, a bottomed square box-like wiring box having an opening on the front surface is installed on the back side of the lightweight partition wall. The above-mentioned wiring equipment and wiring box are each fixed and installed with screws, but when taking out screws from the outside of the wiring box (eg tool box), it takes time from taking out the screws to installing the wiring box. Or there was a problem that it was easy to lose the screw. Therefore, a wiring box having a screw holding portion for holding a screw in the box body has been devised.

As a wiring box provided with the screw holding part, for example, there is one disclosed in Patent Document 1. Patent Document 1 discloses a wiring box including a holding portion that removably holds a screw (screw) for attaching a wiring device inside the box body. The holding portion is formed on the opening side of the inner surface of the side wall of the box body, and has a substantially inverted U-shaped cross section with a groove that opens toward the lower side (bottom wall side) and the inner side of the box body. ing. Specifically, the holding portion is formed so that its cross-sectional shape protrudes substantially perpendicularly to the inner surface from the inner surface of the side wall. And the groove | channel formed in the holding | maintenance part can hold | maintain the screw so that it may stand substantially perpendicularly with respect to the side wall inner surface by pinching | interposing the edge part of a screw | thread.
JP 11-69563 A

  However, the holding part has a substantially inverted U-shaped cross section that opens toward the lower side and the inner side of the box body, and holds the peripheral part of the screw end so as to surround it. For this reason, when installing a wiring box in which a screw is held in the holding part, if force is applied to the screw such as when an operator's finger or tool hits the screw during installation work, There is a possibility that the screw may be easily pulled out toward the opening surface side or the direction in which the groove opens, that is, toward the inner side or the bottom wall side of the box body.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a wiring box that can prevent the screw from being pulled out to the inside of the box body and the opening surface side. is there.

In order to solve the above problems, the invention described in claim 1 is a wiring box attached to a construction material constituting a building, and includes a box body having an opening surface on a front surface, and a side wall of the box body. A screw holding portion for holding a screw so that a shaft portion of the screw extends into the box body and a space is formed between the shaft portion of the screw and the bottom wall of the box body; Is formed on the side wall of the box body, and the head housing space that can accommodate the head of the screw by moving the head of the screw in the depth direction of the box body from the opening surface side, and An abutting portion that abuts from the shaft side of the screw against the head of the screw housed in the head housing space to prevent the screw from slipping into the box body, and the opening surface side of the screw Pull out to prevent slipping out And summarized in that and a prevention unit out.

  According to a second aspect of the present invention, in the wiring box according to the first aspect, the slip-out prevention unit moves the head of the screw from the thickness direction between the inner surface of the head housing space and the contact portion. The gist is pinching.

  The gist of a third aspect of the present invention is the wiring box according to the first aspect, wherein the pull-out prevention portion clamps the head portion of the screw from the radial direction on the inner surface of the head housing space.

  According to a fourth aspect of the present invention, in the wiring box according to the first aspect, the pull-out prevention portion holds the shaft portion of the screw protruding from the head housing space into the box body by the contact portion. The gist is to do.

  According to a fifth aspect of the present invention, in the wiring box according to the first aspect, the pull-out prevention part projects from the side wall toward the side wall facing the side wall and opens from the head housing space. The gist is that the protrusion is located on the surface side.

  The invention according to claim 6 is the wiring box according to any one of claims 1 to 5, wherein the head housing space is formed within the thickness of the side wall. To do.

  The invention according to claim 7 is the wiring box according to any one of claims 1 to 6, wherein the screw holding portion is formed on the opening surface side and held by the screw holding portion. The gist is that a space for inserting a finger is formed between the shaft portion of the screw and the bottom wall of the box body.

  According to an eighth aspect of the present invention, in the wiring box according to any one of the first to sixth aspects, the contact portion is formed so as to be able to bend and deform toward the inside of the box body. It becomes a summary.

  According to the present invention, it is possible to prevent the screws from being pulled out to the inside of the box body and the opening surface side.

  Hereinafter, an embodiment of a wiring box embodying the present invention will be described with reference to FIGS. In the following description, “upper” and “lower” of the wiring box and the light-weight shaped steel are the directions of the arrow Y1 shown in FIG. 3, and the “left” and “right” are the directions of the arrow Y2 shown in FIG. Is the left-right direction, and “front” and “rear” are the directions of the arrow Y3 shown in FIG.

  As shown in FIG. 3, the wiring box 10 is attached to a lightweight section steel material P as a construction material constituting the lightweight partition wall in order to install a wiring device (not shown) on the lightweight partition wall (building). The lightweight steel P is made of a thin steel plate and is a C-shaped steel having a substantially C shape in a cross-sectional view in a direction orthogonal to the direction in which the lightweight steel P is erected. ). The lightweight steel P is composed of an opening Pa extending in the standing direction, a back plate portion Pb facing the open portion Pa, and a pair of side plate portions Pc sandwiching the back plate portion Pb. The opening Pa is formed between a pair of opposed lip portions Pd extending from the pair of side plate portions Pc, and each lip portion Pd is opposed to the back plate portion Pb. ing.

  As shown in FIGS. 1 and 2, the wiring box 10 includes a box body 11 made of a synthetic resin material and formed in a bottomed square box shape. The box body 11 is formed from a bottom wall 12 having a square plate shape and side walls 13 to 16 standing on the side edges of the bottom wall 12 and surrounded by the side walls 13 to 16. A box opening Sa is provided on one side (front side). As shown by a two-dot chain line in FIG. 2, in the box body 11, the front surface facing the bottom wall 12 and opening the box opening portion Sa is defined as an opening surface S of the box body 11, and all the side walls 13-16. , The end face on the box opening Sa side is all located on the opening face S. Of the side walls 13 to 16, a pair of side walls on the short side of the box body 11 is referred to as an upper side wall 13 and a lower side wall 14, and a pair of side walls on the long side is referred to as a left side wall 15 and a right side wall 16.

  On the opening surface S side of the left side wall 15, an extending portion 15 a extending in a direction connecting the upper side wall 13 and the lower side wall 14 adjacent to the left side wall 15 (hereinafter, referred to as a length direction of the left side wall 15). Is provided. The extending portion 15 a extends outward so as to be orthogonal to the wall surface of the left side wall 15, and the extending portion 15 a is located on the opening surface S. That is, the extending portion 15a constitutes a part of the end surface of the left side wall 15 on the box opening portion Sa side.

  As shown in FIG. 2, a plurality (three in this embodiment) of contact bases 21 are formed on the left side wall 15 at equal intervals, and the three contact bases 21 are formed on the extended portion 15 a. It is connected continuously. That is, the three contact bases 21 are integrated with the extending portion 15a. Of the three abutments 21, the abutment pedestal 21 located on the upper side wall 13 side is referred to as a first abutment pedestal 210, and the abutment pedestal located at the center in the length direction of the left side wall 15 is the second abutment. The contact pedestal 211 is referred to as a third contact pedestal 212. The first to third contact bases 210 to 212 are swelled outward from the left side wall 15, respectively, and extend in the depth direction of the box body 11 (the front-rear direction indicated by the arrow Y3) in a rectangular shape in front view. Is formed. Further, in the first to third contact bases 210 to 212, the surface facing the outside of the box main body 11 and parallel to the wall surface of the left side wall 15 is attached to the lightweight steel material P of the box main body 11. At this time, the abutting surface 21A that abuts against the lightweight steel P (lip portion Pd) is formed. The contact surface 21A is located on the same plane as the surface that is parallel to the wall surface of the left side wall 15 in the extended portion 15a.

  Further, the first to third contact bases 210 to 212 are formed with one insertion hole 27 having a substantially circular hole shape, and each insertion hole 27 is a screw N for fixing the box body 11 to the lightweight steel member P. (See FIG. 3) is formed so that it can be inserted, and the hole width of the insertion hole 27 is slightly longer than the diameter of the shaft portion J of the screw N. Further, as shown in FIG. 1, in the extending portion 15 a, a protruding portion 23 protrudes from a central portion in the length direction of the left side wall 15.

  Three extending projections 22 project outward from the extended portion 15a (left side wall 15). Of the three engagement protrusions 22, the engagement protrusion located on the upper side wall 13 side of the left side wall 15 is referred to as a first engagement protrusion 220, and the engagement located at the center in the length direction of the left side wall 15. The mating projection is referred to as a second engagement projection 221, and the engagement projection located on the lower side wall 14 side is referred to as a third engagement projection 222. The first to third engagement protrusions 220 to 222 are in a state where the first to third contact bases 210 to 212 (contact surface 21A) are in contact with the lip part Pd, It is formed so as to be able to engage with a corner portion C between the side plate portion Pc adjacent to the lip portion Pd.

Next, the 1st-3rd screw holding | maintenance part 30A-30C holding the screw | thread N is demonstrated using FIG.4 and FIG.5.
As shown in FIG. 4A, the screw N is held on the opening surface S side of the left side wall 15 so that the shaft portion J of the screw N extends from the inner surface of the left side wall 15 into the box body 11. First to third screw holding portions 30 </ b> A to 30 </ b> C are formed at equal intervals in the length direction of the left side wall 15. Further, the first to third screw holding portions 30A to 30C are not connected to the bottom wall 12, and the first to third screw holding portions 30A to 30C are formed on the opening surface S side from the bottom wall 12, It is formed on the bottom wall 12 side from the opening surface S. The first screw holding portion 30 </ b> A is located on the upper side wall 13 side, and the second screw holding portion 30 </ b> B is located on the center portion in the length direction of the left side wall 15. The third screw holding portion 30C is located on the lower wall 14 side.

  The left side wall 15 is recessed with a guide portion 300 that guides the head T of the screw N from the opening surface S side to the first to third screw holding portions 30A to 30C. That is, the guide portion 300 is formed on the opening surface S side from the first to third screw holding portions 30A to 30C, and the end portion on the opening surface S side of the left side wall 15 and the first to third screw holding portions 30A to 30C. It is formed so that it may be located between. And the guide part 300 and the 1st-3rd screw holding | maintenance parts 30A-30C are formed in communication. In the guide part 300, the opening width along the length direction of the left side wall 15 is slightly longer than the diameter of the head T. Further, the guide part 300 is formed to extend in the depth direction of the box body 11 with a certain opening width. Further, in the guide part 300, the inner side surfaces facing in the length direction of the left side wall 15 are formed so that the opening width along the length direction of the left side wall 15 is gradually widened toward the inside of the box body 11. (See FIG. 3).

  The first to third screw holding portions 30 </ b> A to 30 </ b> C each have a head receiving space 303 that can receive the head T from the opening surface S side within the thickness of the left side wall 15 along the depth direction of the box body 11. I have. The head accommodating space 303 is formed so as to communicate with the guide part 300. In the head accommodating space 303, the opening width along the length direction of the left side wall 15 is the same as the opening width of the guide portion 300. That is, in the head accommodating space 303, the opening width along the length direction of the left side wall 15 is slightly longer than the diameter of the head T of the screw N. Further, the depth of the head accommodating space 303 along the depth direction of the box body 11 is slightly shorter than the diameter of the head T. That is, the head accommodating space 303 is large enough to accommodate the entire head T of one screw N.

  The first to third screw holding portions 30A to 30C include a shaft portion insertion groove 301 that allows the shaft portion J of the screw N to be inserted from the opening surface S side. The shaft insertion groove 301 communicates with the head housing space 303 and is located on the inner side of the box body 11 with respect to the head housing space 303. Further, in the shaft portion insertion groove 301, the opening width along the length direction of the left side wall 15 is shorter than the diameter of the head portion T and slightly longer than the diameter of the shaft portion J. The depth of the shaft insertion groove 301 along the depth direction of the box body 11 is slightly shorter than the diameter of the head T. Therefore, the head portion T can be accommodated in the shaft portion insertion groove 301 at the same time as the head portion T is accommodated in the head accommodating space 303.

  Further, as shown in FIGS. 4B and 5, in the first to third screw holding portions 30 </ b> A to 30 </ b> C, a pair of clamping portions 302 are formed at positions where the shaft portion insertion groove 301 is sandwiched. Here, the surface facing the clamping unit 302 is defined as an inner surface 304 of the head accommodating space 303. The clamping portion 302 is formed with a gradient (3 ° in the present embodiment) so as to gradually increase along the depth direction of the box body 11 from the opening surface S side toward the back side of the head accommodating space 303. ing. That is, the opening width w formed by the sandwiching portion 302 and the inner surface 304 of the head housing space 303 is directed from the opening surface S side to the back side of the head housing space 303 along the depth direction of the box body 11. According to, it is gradually narrowed. The opening width w on the back side of the head housing space 303 is slightly narrower than the thickness of the head T of the screw N. Accordingly, the head portion T of the screw N is forcibly fitted into the opening width w formed by the sandwiching portion 302 and the inner surface 304 of the head accommodation space 303, so that the sandwiching portion 302 and the head accommodation space. It is sandwiched from the thickness direction together with the inner surface 304 of 303 and firmly clamped. In addition, the opening width between the pair of sandwiching portions 302 formed at the position where the shaft portion insertion groove 301 is sandwiched is formed to be narrower than the maximum outer diameter of the head T. Therefore, the clamping portion 302 holds the screw N also by contacting the head portion T of the screw from the shaft portion J side.

Further, in the left side wall 15, a protrusion 31 having a substantially arc shape in cross section is formed on the bottom wall 12 side from the second screw holding portion 30 </ b> B.
Therefore, in the present embodiment, the sandwiching portion 302 and the inner surface 304 of the head receiving space 303 serve as a slip-out preventing portion that prevents the screw N from slipping out toward the opening surface S, and the sandwiching portion 302 is the box body of the screw N. 11 is a contact portion that comes into contact with the head T from the shaft portion J side of the screw N in order to prevent it from slipping out.

Next, an operation for inserting and holding the screw N in the second screw holding portion 30B will be described.
As shown in FIG. 5, the head T is inserted into a guide part 300 formed in communication with the second screw holding part 30B, and the screw N is slid from the opening surface S side to the bottom wall 12 side. As described above, the guide portion 300 and the second screw holding portion 30B are formed in communication with each other, and the opening width of the guide portion 300 and the head accommodating space 303 along the length direction of the left side wall 15 is the width of the head T. Since it is slightly longer than the diameter, the head T of the screw N is guided toward the head accommodating space 303 by the guide part 300. 3 and FIGS. 4A and 4B, the head portion T of the screw N is accommodated in the head accommodating space 303, and the shaft portion J is inserted into the shaft portion insertion groove 301. And the head T is a head part by the clamping part 302 and the inner surface 304 of the head accommodation space 303 in the aspect forcibly fitted between the clamping part 302 and the inner surface 304 of the head accommodation space 303. It is sandwiched from the thickness direction of T and firmly sandwiched. The head T is firmly clamped by the clamping unit 302 and the inner surface 304 of the head accommodating space 303, so that the head T is prevented from coming out toward the opening surface S. In addition, since the clamping portion 302 comes into contact with the head portion T of the screw N housed in the head housing space 303 from the shaft portion J side of the screw N, the box body 11 is pulled out inward. Is also prevented. Accordingly, the screw N is held by the second screw holding portion 30 </ b> B so that the shaft portion J of the screw N extends from the inner surface of the left side wall 15 into the box body 11, and is integrated with the wiring box 10.

In a state where the screw N is held by the second screw holding portion 30B, a space K in which a finger can be inserted is formed between the shaft portion J of the screw N and the bottom wall 12.
Next, the operation of attaching the wiring box 10 to the lightweight steel material P will be described with reference to FIG.

  First, in a state where the lightweight steel member P is erected, the contact surfaces 21A of the first to third contact bases 210 to 212 of the box body 11 are brought into contact with the lip portion Pd of the lightweight steel member P. Further, the back surface (not shown) of the protruding portion 23 is brought into contact with the outer wall surface of the side plate portion Pc adjacent to and orthogonal to the lip portion Pd in the lightweight steel P. Then, the first to third engagement protrusions 220 to 222 engage with the corner portion C between the lip portion Pd and the side plate portion Pc.

  When the front surface (not shown) of the protruding portion 23 is pressed with the thumb, the back surface of the protruding portion 23 is pressed against the side plate portion Pc, and the protruding portion 23 is sandwiched between the thumb and the side plate portion Pc. 10 is held by the lightweight steel P. Assume that force is applied to the screw N held in the second screw holding portion 30B in this holding state. At this time, the head portion T of the screw N is firmly sandwiched by the sandwiching portion 302 and the inner surface 304 of the head accommodating space 303 from the thickness direction, and the pair of sandwiching portions 302 abut against the head portion T of the screw N. ing. For this reason, the head T of the screw N is prevented from tilting inward to the box body 11, and is not pulled out from the head housing space 303 into the box body 11, and is pulled out to the opening surface S side. I will not take off. Further, even when the wiring box 10 is carried in a state where the screw N is held by the second screw holding portion 30B, the screw N is pulled out into and out of the opening surface S side and the box body 11 by the above-described configuration. There is nothing to do.

  Subsequently, the screw N is taken out from the second screw holding portion 30B. As described above, since the space K is formed between the shaft portion J of the screw N held by the second screw holding portion 30B and the bottom wall 12, a finger is put into the wiring box 10 from the opening surface S side. By inserting and inserting the finger into the space K, the finger can be inserted into the back side of the shaft portion J. Then, the shaft portion J is pushed out toward the opening surface S by a finger, or the shaft portion J of the screw N is picked, the shaft portion J is pushed out toward the opening surface S, and the screw N is pushed into the second screw holding portion 30B. Take out from. The series of operations described above can also be performed in the first screw holding unit 30A and the third screw holding unit 30C.

  Then, the wiring box 10 is attached to the lightweight steel P by inserting the screw N that has been taken out into the insertion hole 27 of the box body 11 and forcibly screwing the screw N into the lip portion Pd.

According to the above embodiment, the following effects can be obtained.
(1) The first to third screw holding portions 30 </ b> A to 30 </ b> C include a head accommodating space 303 that can accommodate the head T of the screw N from the opening surface S side of the box body 11, and the head accommodating space 303. Further, on the inner side of the box main body 11, there is provided a clamping portion 302 that sandwiches and clamps the head T from the thickness direction together with the inner surface 304 of the head accommodating space 303. The opening width between the pair of sandwiching portions 302 is formed to be narrower than the maximum outer diameter of the head T, and the sandwiching portion 302 is in contact with the head T. Therefore, even if a force is applied to the screw N held in the first to third screw holding portions 30A to 30C, the screw N is prevented from being pulled out to the inner side of the box body 11 and the opening surface S side. The state where the screw N is held in the first to third screw holding portions 30A to 30C can be maintained. Further, even when the wiring box 10 is carried in a state where the screw N is held by the first to third screw holding portions 30A to 30C, the screw N can be prevented from being pulled out.

  (2) The opening width w between the sandwiching portion 302 and the inner surface 304 of the head receiving space 303 increases from the opening surface S side to the back side of the head receiving space 303 along the depth direction of the box body 11. It is getting narrower gradually. The opening width w on the back side of the head housing space 303 is slightly narrower than the thickness of the head T of the screw N. Therefore, by pushing the head T into the back side of the head housing space 303, the head T can be more firmly sandwiched between the sandwiching portion 302 and the inner surface 304 of the head housing space 303. Accordingly, it is possible to make the screws N held by the first to third screw holding portions 30A to 30C more difficult to drop off.

  (3) The first to third screw holding portions 30A to 30C are formed on the opening surface S side of the left side wall 15, and the shaft portion of the screw N held by the first to third screw holding portions 30A to 30C. Between J and the bottom wall 12, a space K into which a finger can enter is formed. By using this space K, it is possible to easily apply a force to push the shaft portion J toward the opening surface S or to grip the shaft portion J with a finger.

  (4) The guide portion 300 and the first to third screw holding portions 30A to 30C are formed in communication. Thereby, the head T of the screw N inserted from the opening surface S side is inserted into the guide part 300, and the head T is accommodated in the head accommodating space 303 only by sliding in the depth direction of the box body 11, The operation of inserting the shaft portion J into the shaft portion insertion groove 301 can be easily performed.

  (5) Both side surfaces of the guide portion 300 are shaped to gradually widen the opening width from the bottom surface of the guide portion 300 toward the inner side of the box body 11. Thereby, a space as a groove of the guide part 300 is widened, and the head T is smoothly moved from the opening surface S side along the depth direction of the box body 11 without being caught by the guide part 300. It can guide to holding parts 30A-30C.

  (6) The first to third screw holding portions 30 </ b> A to 30 </ b> C are formed on the opening surface S side from the bottom wall 12 and are formed on the bottom wall 12 side from the opening surface S. For this reason, it can be made difficult to apply force from the opening surface S side to the screw N held by the first to third screw holding portions 30A to 30C. Accordingly, it is possible to prevent the screw N from being pulled out while holding the screw N by the first to third screw holding portions 30A to 30C.

  (7) In the current wiring box 10, there is one in which a holding portion for holding the screw N is also used as the insertion hole 27. In this case, since the shaft portion J of the screw N is fitted into the insertion hole 27 and the screw N is held upright from the inner surface of the left side wall 15, the hole width of the insertion hole 27 is made larger than the diameter of the shaft portion J. Slightly shorter. However, since the hole width of the insertion hole 27 is slightly shorter than the diameter of the shaft portion J, the screw N is forcibly screwed into the lip portion Pd of the lightweight steel member P in order to attach the wiring box 10 to the lightweight steel member P. When doing so, the rotational force of the screw N is also transmitted to the box body 11. Thereby, the wiring box 10 itself was rotated, and it was difficult to smoothly perform the work of attaching the wiring box 10 to the light-weight shaped steel material P. However, by forming the first to third screw holding portions 30A to 30C separately from the insertion hole 27 as in the present embodiment, the hole width of the insertion hole 27 is larger than the diameter of the shaft portion J of the screw N. Even when the screw N is inserted into the insertion hole 27 and forcibly screwed into the lip portion Pd of the lightweight steel P, the rotational force at the time of attachment is not transmitted to the box body 11. Therefore, the work of attaching the wiring box 10 to the lightweight steel material P can be performed smoothly.

In addition, you may change the said embodiment as follows.
As shown in FIG. 6, in the embodiment, the opening width of the shaft portion insertion groove 301 is gradually narrowed from the opening surface S side toward the back side of the shaft portion insertion groove 301 along the depth direction of the box body 11. The base of the shaft portion J may be sandwiched by the shaft portion insertion groove 301. That is, the screw N may be held by the first to third screw holding portions 30 </ b> A to 30 </ b> C while sandwiching both the head T and the shaft portion J. In this case, the shaft portion insertion groove 301, the clamping portion 302, and the inner surface 304 of the head receiving space 303 form a slip-out preventing portion that prevents the screw N from slipping out toward the opening surface S. Note that the slip-out prevention portion may be formed only by the shaft portion insertion groove 301.

  As shown in FIGS. 7A and 7B, in the embodiment, the sandwiching portion 302 is formed thinner than the sandwiching portion 302 described in the present embodiment, and the head receiving space is formed from the opening surface S side. The thickness may be constant up to the back side of 303. Then, as shown in FIG. 7B, with the screw N held by the second screw holding portion 30 </ b> B, the tip of the shaft portion J is pressed by the finger toward the bottom wall 12 of the box body 11. The screw N may be taken out by bending the pinching portion 302 toward the inside of the box body 11 by an operation as shown in FIG.

  7 (a) and 7 (b), the tip of the shaft portion J is pressed with a finger toward the bottom wall 12 of the box body 11, and the holding portion 302 is deformed so as to be bent toward the inside of the box body 11. Thus, the screw N may be taken out.

  As shown in FIG. 8, in the embodiment, the interval between the inner surfaces 305 of the head receiving space 303 facing in the length direction of the left side wall 15 is slightly narrower than the diameter of the head T, The screw N may be held by the inner surface 305 so as to sandwich the head T from the radial direction. In this case, the inner surface 305 of the head receiving space 303, the sandwiching portion 302, and the inner surface 304 of the head receiving space 303 form a slip-out preventing portion that prevents the head T from slipping out toward the opening surface S. Note that the slip-out preventing portion may be formed only by the inner surface 305 of the head accommodating space 303.

  As shown in FIG. 9, in the embodiment, the protrusion 306 may protrude from the left side wall 15 toward the right side wall 16 and may be formed closer to the opening surface S than the inner surface 304 of the head accommodating space 303. Good. In this case, the protrusion 306, the sandwiching portion 302, and the inner surface 304 of the head housing space 303 form a slip-out preventing portion that prevents the head T from slipping out toward the opening surface S. Note that the escape prevention portion may be formed only by the protrusion 306.

  As shown in FIG. 10, in the embodiment, the opening width of the shaft portion insertion groove 301 along the length direction of the left side wall 15 is formed slightly narrower than the diameter of the shaft portion J. May sandwich the shaft portion J. In this case, the clamping part 302 serves as a slip-out prevention part and a contact part. Note that the slip-out preventing part may be formed only by the clamping part 302 in which the opening width of the shaft part insertion groove 301 is narrowed.

  In the embodiment, the clamping portion 302 is formed with a gentle gradient from the opening surface S side to a predetermined position of the head receiving space 303, and further inclined toward the back side from the predetermined position. It may have a two-stage gradient angle.

In the embodiment, the first to third screw holding portions 30A to 30C are formed on the opening surface S side of the left side wall 15, but may be on the bottom wall 12 side.
O The clamping part 302 may not be integrally formed with the left side wall 15, and may be separately attached to the left side wall 15.

  The guide portion 300 does not have to be recessed from the end of the left side wall 15 located on the opening surface S and communicated with the first to third screw holding portions 30A to 30C. Further, it may be formed so as to communicate with the first to third screw holding portions 30A to 30C from the bottom wall 12 side.

  As shown in FIG. 11, the first to third screw holding portions 30 </ b> A to 30 </ b> C and the first to third screw holding portions 30 </ b> A to 30 </ b> C shown in FIGS. 6 to 10 protrude from the inner surface of the left side wall 15. It may be provided on the provided protrusion.

In the present embodiment, the first to third screw holding portions 30 </ b> A to 30 </ b> C are formed on the left side wall 15, but may be provided on the upper side wall 13, the lower side wall 14, or the right side wall 16.
The wiring box 10 includes a rectangular frame-shaped box body made up of an upper side wall 13, a lower side wall 14, a left side wall 15, and a right side wall 16. The structure which installs several 1st-3rd screw holding | maintenance parts 30A-30C may be sufficient.

  The screw held by the first to third screw holding portions 30 </ b> A to 30 </ b> C may be a screw for attaching the wiring device to the wiring box 10.

The front view which shows a wiring box. The side view which shows a wiring box. The perspective view which shows the state which hold | maintained the wiring box to the lightweight shape steel material. 3A is a cross - sectional view taken along the line XX of FIG. 3 showing a wiring box provided with a screw holding portion, and FIG. 4B is an enlarged cross-sectional view showing a screw held by the screw holding portion. The expanded sectional view of a screw holding part. The sectional side view of the wiring box which shows another example of a shaft part insertion groove. (A) is a schematic diagram which shows the state in which the screw is hold | maintained at the screw holding part, (b) is a schematic diagram which shows the state from which the screw is taken out from the screw holding part. (A) is an enlarged front view which shows another example of a screw holding part, (b) is an expanded sectional view which shows another example of a screw holding part. (A) is an enlarged front view which shows another example of a screw holding part, (b) is an expanded sectional view which shows another example of a screw holding part. (A) is an enlarged front view which shows another example of a screw holding part, (b) is an expanded sectional view which shows another example of a screw holding part. (A) is an enlarged front view which shows another example of a screw holding part, (b) is an expanded sectional view which shows another example of a screw holding part.

Explanation of symbols

  J: Shaft (screw), K: Space, N: Screw, P: Lightweight steel as construction material, S: Open surface, T: Head (screw), w: Opening width, 10: Wiring box, 11 DESCRIPTION OF SYMBOLS ... Box main body, 12 ... Bottom wall, 15 ... Left side wall, 27 ... Insertion hole, 30A-30C ... 1st-3rd screw holding part, 301 ... Shaft part insertion groove, 302 ... Clamping part, 303 ... Head accommodation space 304: inner surface of the head housing space, 305: inner surface of the head housing space, 306: projection.

Claims (8)

A wiring box that can be attached to the building materials that make up the building,
A box body having an opening surface on the front surface, a shaft portion of the screw extending from the side wall of the box body into the box body, and a space is formed between the shaft portion of the screw and the bottom wall of the box body And a screw holding part for holding a screw,
The screw holding portion is formed on a side wall of the box main body, and can accommodate the head of the screw by moving the screw head from the opening surface side in the depth direction of the box main body. A space, an abutting portion that abuts from the shaft side of the screw against the head of the screw housed in the head housing space to prevent the screw from slipping into the box body, and the screw A wiring box comprising: a slip-out preventing portion for preventing slip-out to the opening surface side.   2. The wiring box according to claim 1, wherein the pull-out prevention unit clamps the head portion of the screw from the thickness direction between an inner surface of the head housing space and the contact portion.   2. The wiring box according to claim 1, wherein the pull-out prevention unit clamps the head of the screw from the radial direction on the inner surface of the head housing space.   2. The wiring box according to claim 1, wherein the pull-out prevention unit sandwiches the shaft portion of the screw protruding from the head housing space into the box body by the contact portion.   2. The protrusion according to claim 1, wherein the escape prevention part is a protrusion that protrudes from the side wall toward a side wall that faces the side wall and that is positioned closer to the opening surface than the head accommodating space. Wiring box.   The wiring box according to claim 1, wherein the head housing space is formed within a thickness of the side wall.   The screw holding portion is formed on the opening surface side, and a space for allowing a finger to enter between the shaft portion of the screw held by the screw holding portion and the bottom wall of the box body is formed. The wiring box according to any one of claims 1 to 6.   The wiring box according to claim 1, wherein the contact portion is formed so as to be able to bend and deform toward the inside of the box body.

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