JPS62207109A - Floor burial junction box for floor wiring cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a floor-embedded cable that can be used to bring cables routed to the floor of a building or the like into the floor and connect them to cables buried in the floor. Concerning the reading box.

[Conventional technology]

FIG. 3 shows a conventionally proposed floor-embedded junction box.

The junction box 1 includes a junction box body 2 that is open at the top and accommodates a direct reading terminal block, and a top cover 3 that closes the upper opening of the junction box body 2. A shelf board 5 having screw holes 4, 4, etc. is provided in the side wall portion near the upper opening, and screws 7, 7, etc. are inserted through the through holes 6 of the upper lid.
are screwed into the screw holes 4, 4, etc. of the shelf board 5 and tightened to fix the upper cover 3 to the opening of the junction box main body.

However, the upper lid 3 has a horizontal frontage 3a by cutting a part of the side wall.
An upper plate 3b is formed above the horizontal frontage 3a.
An eave-like piece 3c is provided that protrudes on the same plane.

The junction box configured in this way is as shown in Fig. 4.
The upper cover 3 is mounted on the junction box body 2, and a spacer 8 is provided which blocks the horizontal opening 3a of the lower example of the eave-like piece 3C and protrudes in front of the eave-like piece 3C, and in this state, a concrete 9 is formed to form a floor. After the concrete 9 has sufficiently hardened, the spacer 8 is removed, and by removing the spacer 8, a concave portion 10 is formed that extends from the floor top surface 9a to the horizontal opening 3a.

Therefore, the cables routed on the upper surface of the floor are drawn into the junction box through the lateral opening 3a using the recessed portion 10 as an approach.

Incidentally, reference numeral 11 denotes an insertion hole for attaching a conduit directly buried in the concrete 9 and for introducing a cable inside the conduit.

[Problem that the invention seeks to solve]

According to the junction box having such a configuration and use condition, the lower edge of the horizontal opening 3a serving as the cable entry port becomes the upper opening edge of the junction box main body 2, so that it rises from the concrete surface and becomes an obstacle to the cable. In order to prevent this, when embedding the junction box body 2 into the concrete 9, the concrete is poured by adjusting it to match the floor level after embedding in the concrete, but the concrete is placed at the level of the spacer 8. It is extremely difficult to pour concrete into concrete, and it is even more difficult to adjust the level due to factors such as shrinkage of concrete after hardening.

In view of the problems of the prior art described above, the present invention provides a floor-embedded junction box of this type that does not require embedding positioning of the junction box itself for drawing in floor wiring cables when the junction box is embedded in concrete. For the purpose of providing.

[Means for solving problems]

In order to achieve this objective, the floor-embedded junction box of the present invention has the following features:
The junction box body includes a connection box body that accommodates a connection part, a top cover provided at the upper opening of the connection box body, and a core provided between the top cover and the connection box body. A support leg that stands on the bottom of the connection box body, a crossbeam that is provided on the top of the support leg and has an approach portion for pulling in the floor wiring cable, and a crossbeam that protrudes from the lower end of the support leg to connect the connection box. The apparatus further includes an adjusting means which is brought into contact with the bottom of the box body and which adjusts the position of the approach part to the floor wiring level.

Such an adjustment means can be configured to protrude to an arbitrary length from the lower end of the support leg by threading it vertically through the support leg using, for example, a threaded rod.

〔Example〕

1 and 2 show a preferred embodiment of this type of floor-embedded junction box according to the present invention.

A given junction box 20 is composed of a junction box main body 21, an upper lid 22, and a core 23 provided between these,
The structure of each part is as follows.

First, the connection box main body 21 has a volume sufficient to accommodate the connection terminal block, has a bottom, and is open at the top.

The core 23 includes a cross beam 24 that is assembled like a circumferential edge using four plate materials, and four prismatic support legs 25. One end is arranged in each section, and one end in the axial direction is fixed in contact with the other end. These members may be fixed using known fixing tools, adhesives, or the like.

Therefore, the crossbeam 24 has plate portions 2 facing each other on one side.
4a, 24a, a flat plate portion 24a1 and an inclined portion 2 protruding from the flat plate portion 24a1 in the opposite direction and in the direction in which the support legs extend.
4a2 forms an approach surface for pulling in the cable. On the other hand, each of the support legs 25 has a screw hole 25a penetrating through it in its own axial direction.
A threaded rod 26 is threaded through the hole a, and the lower end of the threaded rod 26 protrudes from the lower end of the support leg.

Holes 24 are provided at each corner of the crossbeam 24 to communicate with the screw holes 25a.
b is provided, and a tool such as a screwdriver is inserted through this hole 24b and engaged with the end of the threaded rod, thereby making it possible to adjust the length of the threaded rod 26 protruding from the support leg 25.

The upper lid 22 is made of a plate material having a shape related to the cross beam 24 of the core 23, and has an approach surface 24a.

, 24ag are formed with predetermined notches 22a, and are shaped so that there is no problem in pulling in the cable.

The junction box 20 with each part configured in this way has a core 23.
The four supporting legs 25 are located at the four corners of the junction box body 21, and the lower ends of the threaded rods 26 are attached to the bottom surface 2 of the junction box body 21.
1a, so that the supporting legs 25 stand on their feet, and the upper cover 22 is provided through the cross beam 24 of the core 23 to close the upper opening of the junction box body 21, thereby completing the assembly. When completed, only the junction box body 21 needs to be directly buried and fixed in concrete.

That is, as shown in FIG. 2, the junction box body 21 is embedded in a floor 27 formed by hardening concrete in order to set the junction box in a predetermined position.

Assemble the core 23 inside the junction box body 2I embedded in this way as described above, and in that state, operate the threaded rod 26 that is in contact with the bottom surface 21a of the junction box body and By adjusting the leg length of 25, the flat plate portion 24a1 of the crossbeam 24 is brought into alignment with the surface 27a of the concrete floor 27 on which the cable is routed. Such level adjustment is performed on the core 23, which is not directly fixed to the concrete and can be freely attached and detached, and can therefore be carried out without substantially modifying the concrete floor 27.

After or before such level adjustment, the floor surface 2
(car peso wired to and laid on top of 7a)
The flat cable C placed under the FC is connected to the approach surface 2.
4a+ and 24az are drawn into the junction box main body 21 and connected to a cable passed through a T-wire pipe directly buried in the concrete floor 27 using a connecting terminal block.

After completing the specified connections and level adjustment,
Cover the upper lid 22. The upper cover 22 has its own notch 22a connected to the cable C so as not to damage the cable C that is being drawn in.
It is located at a distance above the

〔Effect of the invention〕

As is clear from the above explanation, according to the floor-embedded junction box for floor wiring cables of the present invention, there is no need to adjust the height of the junction box when it is buried in the floor. Since it is carried out by the cable connector, it is very easy to adjust the level of the cable lead-in part, and there is no need to modify the concrete floor to lead the cable into the junction box, making the floor around the junction box flat. Since it can be left as it is, it is possible to eliminate factors that cause pedestrians to get used to it, and it is also advantageous in terms of protecting the junction box.Furthermore, the junction box itself, which is the direct object of embedding, has a shelf etc. inside. Since the box shape can be made into a simple box without forming any unnecessary protrusions, it is possible to make holes for piping in the box very easily.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing one embodiment of the floor-embedded junction box for floor wiring cables of the present invention, Fig. 2 is a sectional view partially showing the installation of the junction box, and Fig. 3 is An exploded perspective view showing an example of a floor-embedded junction box for conventional floor wiring cape) I);
FIG. 4 is a sectional view partially showing how the connection box is installed. Explanation of symbols 20: Junction box 21: Junction box body 21a: Bottom surface of junction box body 22: Top lid 23: Core 24: Cross beam 24a: Plate portion 24a+: Flat plate portion, 24az: Inclined portion (approach surface) 25: Support Leg 25a: Screw hole 26; Screw rod 27: Floor C; Floor wiring cable representative Patent attorney Fujio Sato 31 Written by $45a

Claims (2)

[Claims] (1) A floor-embedded junction box that brings in the cables routed to the floor and connects them to the cables in the floor, and is provided in the junction box body that accommodates the connection part and in the upper opening of this junction box body. It includes an upper lid and a core provided between the upper lid and the junction box body, and the core is provided with support legs that stand on the bottom of the junction box body and the upper part of the support legs. a cross beam having an approach section for pulling in floor wiring cables; and a cross beam that protrudes from the lower end of the support leg and comes into contact with the bottom of the junction box body, and the position of the approach section is adjusted to match the floor wiring level. A floor-embedded junction box for floor wiring cables, characterized in that it has means. (2) The floor-embedded junction box for floor wiring cables according to claim 1, wherein the adjustment means is a screw member threaded vertically into the support leg.