JPH0516350Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an outlet box fixing device used when attaching an outlet box for electrical work to formwork in the construction of concrete buildings. This invention relates to an outlet box fixing device for attaching bolts that are fixed to the formwork to the notch holes of the outlet box.

Conventional Technology When constructing concrete buildings, outlet boxes for electrical work are fixed in advance to slabs or walls of concrete structures. As shown in Fig. 6, a bolt fixing tool 2 is fixed to one formwork 1a using a nut 3, and a long bolt 4 is screwed into this bolt fixing tool 2, and then the tip of this bolt 4 is screwed. After the box 5 is attached to the bolt 4 by screwing into the attachment hole 6 in the bottom wall of the outlet box 5, the other formwork 1b is constructed.

Problems to be Solved by the Invention However, when the outlet box 5 is attached to the formwork 1a by the above-mentioned means, a special mounting hole 6 of a size corresponding to the bolt 4 is formed in the bottom wall of the box 5. There is a problem that the selection in box 5 is limited because a standard one must be used.

That is, generally, a notched hole of a predetermined size (21.5 mm or 27 mm) is formed in the side wall and bottom wall of the outlet box 5, and a through hole is formed by punching out this notched hole. ,
When adopting the method of attaching the box 5 to the formwork by threading the box 5 onto the bolt 4 threaded onto the bolt mounting tool 2 as described above, the diameter of the above-mentioned notch hole is larger than the diameter of the bolt. There was an inconvenience that the box 5 could not be attached to the bolt 4 using the notch hole, and that only a box 5 with a mounting hole 6 formed in the bottom wall could be used as the box 5.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an outlet box fixing tool that can easily and firmly attach a box 5 to a bolt 4 using a notch hole in an outlet box 5 for electrical work. With the goal.

Means for Solving the Problems That is, the present invention achieves the above objects and provides an outlet box fixing device for attaching a bolt to a notch hole of an outlet box.
A plurality of columnar protrusions having a height slightly longer than half of the wall thickness of the outlet box are inserted into the notch holes on one side of the ring plate-shaped washer body with a circular through hole bored in the center. These protrusions protrude so as to come into contact with the peripheral wall of the notch hole when the body is inserted, and a nut is concentrically fixed to the other surface of the washer body.

Function The outlet box of the present invention, when attaching bolts to the notch holes of an outlet box for electrical work, as shown in Fig. By protruding two protrusions so that they each come into contact with the peripheral wall of the notch hole, and by fixing a nut to the other surface of the washer body, a pair of fixtures can be placed on both sides of the notch hole, and these fixtures can be Insert the protrusion into the notch hole, sandwich the box wall between both fixtures, thread the bolts through the nuts of both fixtures, tighten these nuts, and clamp the box wall with both fixtures to secure the box. can be easily fixed to the bolt. Further, when the fixture is disposed on both sides of the notch hole in this manner, the fixture can be easily positioned with respect to the notch hole by inserting the projection into the notch hole. Furthermore, by making the height of the protrusion slightly longer than half the thickness of the box wall, and by fixing the nut to the washer main body in advance, when the nut is tightened with the box wall held between a pair of fixtures, one of the The tip of the protrusion of one fixture rides over the tip of the protrusion of the other fixture, thereby firmly fixing the box to the bolt without causing reverse rotation of the nut.

Next, the present invention will be specifically explained with reference to Examples, but the present invention is not limited to the following Examples.

Embodiment The outlet box fixing device of the present invention consists of a washer and a nut. FIG. 1 shows the washer of the fixing device according to an embodiment of the present invention. Three cylindrical protrusions 13 are integrally provided on one surface of a ring disk-shaped washer main body 11a having a circular through hole 12 formed therein, spaced apart from each other at equal intervals.

This washer 11 is connected to the circular through hole (notch hole) 1 of the outlet box 5, as shown in FIGS.
4, and when the washer 11 is disposed to cover the through hole 14, the three protrusions 13 respectively contact the peripheral wall of the through hole 14, and at this time, the through hole 12 of the washer 11 and the box 5 through holes 14 are formed concentrically.

Further, the height of the protrusion 13 of the washer 11 is formed to be slightly longer than half the wall thickness of the box 5.
As a result, when the pair of washers 11, 11' are arranged on both sides of the through hole 14 of the box 5 as shown in FIG. They are now able to come into contact with each other.

As shown in FIG.
A nut 15 is concentrically arranged and welded and fixed to the other surface of the side from which the protrusion 13 is not protruded, thereby forming an outlet box fixture 16.

When attaching the outlet box to the formwork as shown in FIG. 6 using the fixture 16, as shown in FIG. A pair of fixtures 16, 16' are arranged on both sides of the fixture (having a Screw the tip of the bolt 4 into the nuts 15, 15' of 16', and then tighten the nuts 15, 15'.
Tighten each other. At this time, as mentioned above, washer 1
The height of the protrusion 13 of the fixture 1 is slightly longer than half the wall thickness of the box 5.
Just before the tightening of the nuts 6, 16' to the box 5 is completed, the tips of the protrusions 13, 13' come into contact with each other, which prevents the nuts 15, 15' from rotating. By strongly turning one or both of the nuts 15, 15', the tip of one of the protrusions 13 climbs over the tip of the other protrusion 13', completing tightening.

In the fixture 16, the outer diameter of the washer 11 is larger than the inner diameter of the through hole 14 of the box 5, so the washers 11, 11' of the pair of fixtures 16, 16' are used to close the box 5 around the through hole 14. By sandwiching the wall,
A box 5 having a through hole 14 with a larger diameter than the bolt 4
can be easily attached to the bolt 4. In addition, a protrusion 1 that contacts the peripheral wall of the through hole 14 is attached to the washer 11.
3 is provided in a protruding manner, the washer 11 can be easily positioned with respect to the through hole 14 by inserting the protrusion 13 into the through hole 14. Furthermore, as described above, the height of the protrusion 13 is made slightly longer than half the wall thickness of the box 5, and the fixtures 16, 1
At the final stage of tightening of the fixing members 16 and 16', the tip of one protrusion 13 passes over the tip of the other protrusion 13'. Even if the force moves, the rotation of the fixing tools 16, 16' in the tightening release direction is prevented by the tips of the protrusions 13 and 13' contacting each other, so that the fixing tools 16, 16' This ensures that the box 5 is securely fixed to the bolt 4 without loosening. Further, since the fixture 16 has the washer 11 and nut 15 integrated, it also has the advantage of being easy to handle and install.

In the above embodiment, three protrusions 13 were formed, but there is no limit to the number of protrusions, and the washer 1
The number of pieces can be formed as appropriate depending on the purpose of use of the piece. Moreover, although the washer main body 11a is formed into a circular ring shape, it may be formed into other shapes such as a square ring shape.

Effects of the Invention As explained above, the outlet box fixing device of the present invention can easily and firmly attach the bolts fixed to the formwork to the notch holes of the outlet box for electrical work, and is extremely useful. It's expensive.

[Brief explanation of drawings]

Fig. 1 shows a washer for an outlet box fixing device according to an embodiment of the present invention, A is a plan view, B is a sectional view, and Fig. 2 shows a washer of the same example for an outlet box for electrical work. A bottom view showing the state in which the same washer is placed in the through hole, Fig. 3 is a sectional view showing the state in which the same washer is placed on both sides of the same through hole, and Fig. 4 is a box fixing device with a nut attached to the same washer. Figure 5 is a partially omitted cross-sectional view showing the electrical work outlet box attached to the bolt using the same box fixing tool, and Figure 6 is a partially omitted cross-sectional view showing the electrical work outlet box attached to the conventional formwork. FIG. 3 is a cross-sectional view showing an example of a let box attachment means. 1a, 1b...Formwork, 4...Bolt, 5...Outlet box, 11, 11'...Washer, 1
1a...Washer main body, 12...Through hole, 13,1
3'...Cylindrical protrusion, 14...Circular through hole (notch hole), 15, 15'...Nut, 16, 16'...
...Outlet box fixture.

Claims (1)

[Scope of utility model registration request] This is an outlet box fixing device for attaching a bolt to a notch hole in an outlet box, and is a ring plate-shaped washer body with a circular through hole in the center. A plurality of columnar protrusions having a height slightly longer than half the height are protruded so that these protrusions come into contact with the peripheral wall of the notch hole when inserted into the notch hole. An outlet box fixture characterized by concentrically fixing nuts on a surface.