JPH01243809A - Under-carpet power wiring box - Google Patents

Abstract

PURPOSE:To shorten a floor wiring time, by fixing a box frame with the connected earthing conductor of a flat cable for wiring under a carpet, on the surface of a floor at the slots of wing pieces, and by providing the wing pieces, with needles in point contact with an earthing protecting layer. CONSTITUTION:A cover 6 is removed, and to the earthing terminal of a box frame 5 shown in a figure, the earthing conductor G of a flat cable 2 laid on the lower side of a carpet 4 is connected. Through slender fitting slots 10 arranged on the wing pieces 9 of the box frame 5, screws 15 are inserted, and on a floor 3, the box frame 5 is fitted. On the wing pieces 9, needles 14 for point contact are arranged, and are pressure-welded to the earthing protecting layer 13 of 0.3mm in thickness made of galvanized sheet iron, for example, which is inserted into a space between the carpet 4 and the flat cable 2. As a result, floor wiring is efficiently executed, and the time of work is shortened.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an undercarpet power wiring box, and more particularly to an undercarpet power wiring box that eliminates terminal treatment of a ground protective layer and simplifies floor wiring work. related to.

[Technical background of the invention and its problems] In recent years, undercarpet wiring systems have been used for power supply on office floors.

As shown in FIG. 4, the outlet box 1a is connected to a flat cable 2 laid under the carpet, and a plug can be inserted into the outlet 11.

Therefore, between the carpet and the flat cable 2,
Because it is necessary to provide electrical shielding for power distribution to ensure safety so that people do not get electrocuted, a grounding protection layer made of iron plate is inserted. On the other hand, in the flat cable 2, power lines B and W formed of flat conductors C and a grounding line G located between them are spaced apart from each other, and both sides are covered with insulating tape L1. The outlet box 1a is electrically connected to the grounding wire G of the flat cable 2 in advance.

In order to electrically shield the ground protection layer, it is necessary to electrically connect the ground protection layer to the outlet box 1a, which is electrically connected to the ground wire G of the flat cable 2 and grounded in advance.

Conventionally, as shown in FIG.
To electrically connect a and the ground protection jifi13a,
Both corner ends of the grounding protection F113a were cut diagonally, mounting holes 14a were provided between them, and the outlet box la and the grounding protection layer 13a were tightened with screws 15a and nuts 16a. Further, as shown in FIG. 6, both corner ends of the grounding protection Fj 13a were cut diagonally, bent, and sandwiched between pressure pars 17a and tightened with 7+ flaps 18a, 18a.

However, in order to obliquely cut both corner ends of the ground 1 protection layer 13a, it is troublesome to measure the dimensions of Xl, Yl, X2, and Y2. Further, since the ground protection layer 13a is made of, for example, a galvanized iron plate and has a thickness of about 0.3 mm, terminal processing operations such as cutting, drilling, and bending are cumbersome and cumbersome.

[Object of the Invention] The present invention has been made in view of the above-mentioned conventional difficulties, and aims to provide an undercarpet power wiring box that eliminates the terminal treatment of the ground protection layer and improves the workability of floor wiring. be.

[Summary of the Invention] In order to achieve the second object, the undercarpet power wiring box of the present invention has a box frame electrically connected to the ground wire of a flat cable used for undercarpet power wiring. 1, the box frame has wing pieces with mounting holes for fixing the frame on the floor on which the carpet is laid;
The wing pieces are provided with prongs that make point contact on the ground (^5 layer) inserted between the carpet and the undercarpet flat cable.

[Embodiments of the Invention] Hereinafter, a case where a preferred embodiment of the present invention is applied to an undercarpet power wiring outlet box will be described with reference to the drawings.

As shown in FIGS. 1 and 3, the outlet box 1 includes undercarpet power wiring of the flat cable 2,
That is, it is used in a power wiring system in which a flat cable 2 is laid between a floor 3 and a carpet 4. The flat cable 2 includes power lines B and W formed by flat conductors C.
and the ground tJG located therebetween are spaced apart from each other,
Both sides are laminated with insulating tape L1 and L2 (
Figure 4).

As shown in FIGS. 1 and 2, the outlet box 1 includes a box frame 5 manufactured by pressing a conductive metal plate, for example, and a cover 6 that is placed over the box frame 5. The box frame 5 has a vertical piece 7 and a horizontal piece 8 forming a portal.

It has wings 9 extending laterally outward from the transverse pieces 8. The wing piece 9 has a mounting hole l formed into a long hole for fixing the box frame 5 on the floor 3 on which the carpet 4 is laid.
O is perforated.

The piece 9 is made of, for example, a galvanized iron plate inserted between the carpet 4 and the flat cable 2, and has a thickness of Q, 3.
A prong 14 is provided for point contact on the ground protection layer 13 of mm.

Outlets lla and llb are housed in two parts of the gate 4 formed by the vertical piece 7 and the horizontal piece 8. This outlet has the form, for example, of the outlet ) 11 shown in FIG. They are connected to contact portions (not shown) of the conductor and ground conductor, respectively (FIG. 1). Of course, this outlet
, 11b, the contact portions of the power conductor and the ground conductor can be connected to corresponding contact portions of a plug (not shown) of an electrical device that requires a power source. Further, the box frame 5 of the outlet box 1 is electrically connected in advance to the grounding wire G of the flat cable 2 (the connecting means is not shown).

To perform under-carpet power wiring using such an outlet box 1, cut the carpet 4 where the outlets 11a and llb are to be installed to the width of the box 1, pull out the flat cable 2 from the outlet box l, and connect the carpet 4 to the area where the outlets 11a and llb are installed. and 3 floors. A ground protection layer 13 is inserted between the carpet 4 and the flat cable 2 and extends between the wing pieces 9 and the floor 3 so that the prongs 14 of the wing pieces 9 make point contact on the ground protection layer 13. Make it.

Next, the curl plug screw 15 is screwed into the floor 3 through the attachment hole IO formed in the long hole of the wing piece 9, and the box frame 5 is screwed into the floor 3.
to be fixed. In addition, since the mounting hole lO is formed as a long hole, before screwing the screw 15 into the floor 3, the box frame 5
It is easy to correct the mounting position.

According to such screw-back work, the box frame 5 is fixed to the floor 3 by the tightening force, and at the same time, the ground protection layer 13 is mechanically fixed because it makes point contact with the tip 14 of the wing piece 9. At the same time, it is electrically connected to the box frame 5 of the outlet box 1 which has been electrically connected to the ground wire G of the flat cable 2 in advance. In this way, the ground protection layer 13 functions as a shielding means.

A state in which a cover 6 is attached to the outlet box 1 with such undercarpet power wiring is shown in FIGS. 2 and 3.

Such an undercarpet power wiring box is
There is almost no need to process the terminals of the ground protection layer, reducing the work time for floor wiring and improving work efficiency.

Although the above embodiment has been described using two outlet boxes, the undercarpet power wiring box of the present invention can equally be applied to a transition box. In addition, in the above embodiment, the number of outlets provided in the outlet box was explained as two, but the number of outlets provided in the outlet box may be one or three.
It may be more than one.

[Effects of the Invention] As is clear from the above embodiments, according to the undercarpet power wiring box of the present invention, the box is electrically connected to the ground wire of a flat cable used for undercarpet power wiring. a frame II, the box frame having wings with mounting holes for fixing the frame on a carpeted floor;
These wing pieces are provided with prongs that make point contact on the ground protection layer inserted between the carpet and the undercarpet flat cable, so that the box frame can be fixed to the floor and at the same time, the ground protection N can be mechanically In addition to fixing the flat cable, it can be electrically connected to the box frame of the outlet box, which is electrically connected in advance to the grounding wire of the flat cable, and there is almost no need to process the terminals of the grounding protection layer, which saves floor wiring work time. The time is shortened and workability is improved, and the effect is enormous.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the undercarpet power wiring outlet box according to the present invention with the cover removed;
Fig. 2 is a tI perspective view showing the same undercarpet power wiring outlet box with the cover attached, Fig. 3 is a partial sectional view showing the same undercarpet power wiring outlet box with the cover attached, and Fig. 4 This figure is a perspective view of a conventional undercarpet power wiring outlet box, and FIGS. 5 and 6 are partial perspective views of the undercarpet power wiring outlet box shown in FIG. 4, respectively. l...Under carpet power wiring box 2...
・Flat cable G...Ground wire 3...Floor 4...Carpet 5...Box frame' 9...Blade lO...Mounting hole 13...Ground protection layer 14...Protrusion cusp

Claims (1)

[Claims] The box frame is electrically connected to the ground wire of a flat cable used for undercarpet power wiring, and the box frame has mounting holes for fixing the frame to the floor on which the carpet is laid. The undercarpet power wiring is characterized in that the blade has a prong that makes point contact with a ground protection layer inserted between the carpet and the undercarpet flat cable. box for.