JPH0750837Y2 - Undercarpet cable polarity converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a polarity conversion device for an undercarpet cable, which is capable of rationally matching the polarity of a cable connector.

(Prior Art) An undercarpet cable is used to connect OA equipment in an office or the like. This under carpet cable is arranged under a carpet laid in the office or the like. Therefore, as the under carpet cable, a flat cable is usually used for a multi-core cable for data transmission. As described above, when the flat cable is used as the under carpet cable, the core wires are arranged in a predetermined order. Therefore, there is polarity in the connector that connects the flat cable to the device.

FIG. 4 is a block diagram of a conventional under carpet cable.

Cable 1 shown is a flat cable composed of four cores 1a ₁ to 1A ₄ of.

Core 1a ₁ to 1A ₄ are arranged in a predetermined order, the cable 1 is connected to the connection box 2 and 3 in sequence of this order.

The connection boxes 2 and 3 are provided with connectors 20 and 30, respectively, at their ends for connecting to OA equipment.

FIG. 5 is a diagram showing a state in which one of the connection boxes of the undercarpet cable of FIG. 4 is reversed.

In the illustrated cable 1, the connection box 3 is horizontally rotated 180 degrees from the illustrated broken line position to the solid line position. Along with this, the cable 1 is bent at its central portion, and a twisted portion 11 is formed at this portion.

Such bending of the cable 1 is necessary in the case shown in FIG.

FIG. 6 is a layout of office automation equipment.

OA devices 41 and 42 are placed on desks 43 and 44, respectively. Connection boxes 2 and 3 are provided on one side of the desks 43 and 44. The OA equipment 41 is connected to the connection box 2 by a connection cord 45. Further, the OA equipment 42 is connected to the connection box 3 by the connection cord 46. in this case,
Since the connection boxes 2 and 3 face the same direction,
As shown in FIG. 5, the cable 1 must be bent halfway.

FIG. 7 is a configuration diagram of another example of the conventional under carpet cable.

The illustrated cable uses special terminal blocks 21 and 31 to convert the polarity of the connector.

The terminal block 21 is provided with connection parts 21a and 21b whose polarities are opposite to each other on the upper and lower sides of the rear end part.

The terminal block 31 has the same configuration as the terminal block 21.

FIG. 8 is a configuration diagram of still another example of the conventional under carpet cable.

The illustrated cable is one in which the cable 1 is bent inside the connection box 3 '.

Figure 8 (a) is for the core wire 1a ₁ to 1A ₄ of cable 1 provided with the torsion unit 11 to the cable 1 at the portion exposed.

FIG. 8 (b) shows a twisted portion 11 provided on the sheath portion of the cable 1.

(Problems to be Solved by the Invention) However, the above-described conventional technique has the following problems.

That is, in the one shown in FIG. 5, since the twisted portion 11 exists in the middle of the under carpet cable, the desk 43 shown in FIG.
There will be a twist 11 underneath the carpet 40 between and 44. Therefore, there is a problem that the electrical connection state of the twisted portion 11 shown in FIG. 5 deteriorates when a load such as a person is placed on the carpet 40.

In addition, in the structure shown in FIG. 7, the terminal blocks 21 and 31 have the connecting portions 21a, 21b and 31a, 31b on the upper side and the lower side, respectively, and since they are vertically long, the connection box is said to be large. There was a problem.

Further, in the structure shown in FIG. 8A, there is a problem that the twisting of the core wire portion having no sheath causes the core wires to electrically interfere with each other, resulting in low noise resistance.

Furthermore, in the structure shown in FIG. 8 (b), the twisted portion 11 becomes large because the sheath portion is twisted. Therefore, there is a problem that the connection box 31 becomes large.

The present invention has been made in view of the above points, and an object of the present invention is to provide a polarity conversion device for an undercarpet cable in which a twisted portion is not under a carpet and a connection box does not become large. .

(Means for Solving the Problems) The polarity conversion device for an undercarpet cable of the present invention twists the cable in order to match the polarities of the connector when the electrical connection between the devices is performed using the flat cable. In the case of providing a portion, the twisted portion is arranged in a space existing between the lower surface of the connection box and the floor surface.

(Operation) In the device described above, the cable is twisted at the sheath portion, and the twisted portion is arranged in the space existing between the lower surface of the connection box and the floor surface. Therefore, it is possible to maintain noise resistance and avoid increasing the size of the conversion box.

(Embodiment) FIG. 1, FIG. 2 and FIG. 3 are views showing the construction of a polarity conversion device for an undercarpet cable of the present invention.

The illustrated cable is a flat cable similar to the conventional cable shown in FIG.

The cable 1 is composed of core wires 1a _{1 to} 1a ₄ and is covered with a sheath.

Core 1a ₁ to 1A ₄ are arranged in a predetermined order, the cable 1 is connected to the connection box 2 and 3 in sequence of this order.

The connection boxes 2 and 3 are of the same type and have connectors 20 and 30 at their ends and terminal blocks 22 and 32 inside. These connection boxes 2 and 3 have a pedestal 23
And 33 fixed above. A space 24 as shown in FIGS. 3A and 3B is formed between the bases 23 and 33, respectively. Since the thickness of the carpet 40 is usually 6 mm or more, a space 24 is formed in the pedestal portion of the connection box, and this space 24 can be effectively used.

In order to match the polarities of the connectors 20 and 30, the twisted portion 11 provided in the cable 1 is arranged below the connection box 3. That is, the twisted portion 11 is arranged in the space 24 existing between the lower surface of the connection box 3 and the floor surface.

According to the device described above, the cable 1 is twisted in the empty space 24 between the connection box 3 and the floor surface. As a result, the twisted portion 11 of the cable 1 is
Underneath or inside the connection box 3. Therefore, it is possible to improve the durability of the cable 1 and prevent the connection box 3 from increasing in size.

The invention is not limited to the embodiments described above.

That is, in the above-described embodiment, the case of the communication cable for connecting the office automation equipment in the office has been described, but the present invention is not limited to this, and can be applied to all the cases of connecting a cable having polarity. It can also be applied to cables that supply three-phase AC power to machinery and equipment in the factory.

(Effect of the Invention) As described above, the polarity conversion device for an undercarpet cable of the present invention has the following effects because the twisted portion of the cable is provided in the space below the connection box.

That is, since the folded portion of the cable is hidden by the lower surface of the connection box, it is possible to prevent a load from being applied to that portion, and it is possible to improve the durability of the cable.

Further, since it is not necessary to make the shape of the terminal block of the connection box special or the cable insertion port special, it is possible to downsize the connection box.

Further, since the cable can be twisted at the sheath portion having the shield layer, it is possible to prevent the shielding effect from being impaired and prevent the noise resistance from being deteriorated.

[Brief description of drawings]

1, 2 and 3 are diagrams showing the construction of the polarity converting device for an undercarpet cable of the present invention, and FIGS. 4 and 5 are diagrams showing the construction of a conventional polarity converting device for an undercarpet cable. FIG. 6 is a layout diagram of OA equipment in an office, FIG. 7 is a diagram showing the configuration of another example of a conventional polarity conversion device for an undercarpet cable, and FIGS. 8 (a) and 8 (b) are conventional diagrams. It is a figure which shows the structure of a polarity conversion box. 1 ... Cable, 2, 3 ... Conversion box, 20, 30 ...
Connector, 22 …… Terminal block, 23 …… Pedestal, 24 …… Space, 4
1,42 …… OA equipment, 43,44 …… desk.

Claims (1)

[Scope of utility model registration request] 1. In order to match the polarities of connectors when making electrical connection between devices using a flat cable,
In the cable provided with a twisted portion, the twisted portion is arranged in a space existing between a lower surface of a connection box and a floor surface, and a polarity conversion device for an under carpet cable.