JPH0528476B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a conversion connection kit used for connecting a carpet underlay cable to a cable or equipment on the power supply side or load side.

[Prior art and its problems] With the recent spread of office equipment and the like due to office automation, the wiring method for supplying power to the equipment has been reconsidered, and a carpet underlay wiring system has been developed. (Special application 1982-
See issue 69980. ) This wiring system consists of at least two live conductors and a ground conductor arranged in parallel within a common insulation sheath, with a conductive shield for grounding, for example made of a metal sheet, provided above the common insulation sheath. A flat cable is used, which is placed on the floor under the carpet with the conductive shield on the upper side.

If a conductive item such as a metal pin, which is often used for office purposes, passes through the carpet, pierces the insulation coating of the cable, and comes into contact with a live conductor,
Since the pierced conductive article is always electrically connected to the conductive shield, current leaking from the live conductor can be allowed to escape to the ground through the conductive shield.

The conductive shield may be grounded by itself, but it can also be connected to the ground conductor of the cable and grounded via the ground conductor.

Such flat cables are used to feed in power supply cables buried in the floor or to power supply boxes installed on the wall, while also being used to feed power out to equipment and wiring installed on the floor. It is necessary to attach a member for conversion and connection to the flat cable and draw out the lead cable from there.

Conventionally, such conversion/connection methods include an online method in which a conversion connection section is configured on a flat cable, and a method in which a connector is attached to the terminal of a flat cable to perform conversion connection.

The former online method places a base plate on the floor and places a flat cable on top of it.
A direct connection terminal block equipped with terminals corresponding to the number of cable conductors is mounted on the upper side of the flat cable, and by fastening the terminal block to the base plate, each terminal of the terminal block is pressure-connected to each conductor of the cable. ,
Then, the end of the lead cable is connected to each terminal. Finally, a protection box is installed from above the direct connection terminal block.

In this method, a large number of piercing teeth are formed on the terminal of such a direct connection terminal block at the part opposite to the conductor of the cable, and the piercing teeth are used to pierce the insulation coating of the cable and contact the live conductor. In order to establish conduction by piercing the conductive shield, it is necessary to cut the conductive shield portion on each live conductor of the flat cable to expose the insulation coating. This cutting process of the conductive shield must be performed carefully using a cutting guide sheet, and is a delicate and troublesome work.

Furthermore, since the direct connection terminal block is mainly made of a plastic molded body and is thick, the overall height from the floor is large, and the protective box protrudes largely from the upper surface of the carpet. Incidentally, the height of the protective box above the carpet is as much as 30mm.

Forming a large protrusion from the carpet in this manner may cause pedestrians to trip over it, or may become an obstacle when floor equipment, desks, etc. are installed, and therefore place restrictions on connection locations.

On the other hand, in the latter cable terminal conversion connection method, the connector terminal block is placed on the floor, and at the terminal of the flat cable, the part of the common insulation covering that extends between the parallel parts of each conductor is separated, and each conductor is An insulated conductor portion coated with insulation is formed on the insulated conductor portion, and a crimped connector having a brim opening is crimped and connected to each of the insulated conductor portions through the insulation coating, thereby terminating the insulated conductor portion. Place each of these termination parts separately on the divided surface of the connector terminal block, place the terminal attached to the end of the lead cable on the upper side of the placed crimp connector, and then tighten the tightening screw on the lead cable. Connection between each conductor of the lead cable and the flat cable is made by passing through the insulated conductor portion with the terminal and crimp connector and screwing it into the connector terminal block.

In that case, the conductive shield is separated from the crimp connector by cutting the end portion that extends over the live conductor and pulling it back, and also extends only the end portion that extends over the ground conductor and connects it together with the ground conductor to the crimp connector. Short-circuited and conductive to the grounding core of the lead cable.

Finally, put on the protective cover.

In this method as well, since the connector terminal block is made of a thick plastic mold, there is the problem that the protective cover protrudes significantly from the upper surface of the carpet, similar to the above-mentioned online method. A complicated cutting process is required.

In addition, special termination processing such as cutting the insulation coating and attaching crimp connectors is required.

These methods require a lot of special processing on the flat cable, and require special tools that are generally difficult to obtain. Therefore, there have been cases where it has not been possible to suddenly change wiring or add more lines.

Further, due to such a request, there are cases where the conversion connection kit that has been installed may be desired to be removed or relocated, but it is difficult to accommodate this request. When the cable is removed or relocated, it is necessary to restore the processed flat cable to its original unprocessed state, but as mentioned above, the task of restoring this cable is extremely troublesome since it has undergone a lot of processing. .

In addition, as a method of not constructing such a conversion connection part on the floor surface, there is a method in which it is raised up and connected to a conversion box that is installed so as to be freestanding on a wall or floor surface.

According to this method, there is no need to form obstructive protrusions on the floor surface, but for this purpose, it is necessary to incorporate a special connection stand on the box side, and there are economic problems such as making the box larger than necessary. with loss.

Further, special termination treatment as described above is required at the end of the flat cable.

Furthermore, this method is also applied when installing a flat cable into a partition and connecting it to the wiring inside the partition, but the partition is installed depending on the indoor layout. Therefore, the wires may intersect at right angles or diagonally with the wiring direction of the flat cable.

If the cables cross diagonally, it becomes difficult to raise a flat cable that has directionality and is difficult to bend edgewise into the partition. This requires the additional work of bending and redirecting the flat cable so that it intersects the plane of the partition at right angles.

[Means for solving problems]

The present invention has been made in view of the above-mentioned problems of the prior art, and is directed to the processing and processing of a flat cable placed under a carpet when a conversion connection section is formed on the flat cable. It can be connected very easily with almost no special tools required, and can be connected at any position on the flat cable without protruding significantly from the carpet surface, and can be converted to the other side's wiring and equipment. To provide a conversion connection kit for carpet underlay cables, which allows connection to be carried out extremely easily, and which can also be removed and relocated with good reproducibility of flat cables. .

The conversion connection kit used for the carpet underlay cable of the present invention that achieves these objectives includes a connection frame provided between the flat cable and the floor surface, a pressing member provided above the flat cable, , a tightening member linked between the pressing member and the connection frame, and a protective cover further provided on the upper side of the pressing member, the connection frame having a recess formed on the lower side. It is characterized by comprising a base plate, a terminal having a large number of piercing teeth that is insulated and supported on the upper surface of the base plate, and a lead cable that has one end connected to the terminal and is passed through the lower recess of the base plate.

The connecting pedestal is preferably made of a metal plate having high rigidity, such as a steel plate, as a main body, and has a substantially trapezoidal shape in which one side of the plate is bent in one direction to form a leg portion.

By standing these legs on the floor,
A predetermined lower recess can be provided therebetween.

The present invention utilizes this lower recess as a lead cable passage.

In addition, the upper surface between the left and right legs is made flat,
This is the connection area for the flat cable.

An insulating plate is placed on the flat metal surface, and a number of terminals corresponding to the number of conductors of the cable, each having a large number of piercing teeth formed on its surface, are installed in parallel at predetermined intervals.

In order to connect each terminal to a lead cable, it is easy to carry out a method in which a long and narrow leg is formed as an extension, and the leg is passed through a metal plate and connected to the lead cable in a lower recess under the metal plate. For this purpose, holes are bored in the flat part of the metal plate for the terminal legs to pass through.
The metal plate and the terminal feet must not come into contact, so
The hole is made sufficiently large to provide space between the metal plate and the foot. Insulators may be interposed inside the holes around the legs to maintain the separation.

The pressing member may be made of a highly rigid metal plate such as a steel plate, and in order to further increase the rigidity, both side edges intersecting in the direction in which the cable is passed may be bent.

The tightening member is preferably a screw that can be operated with a commonly available tool, such as a screwdriver, and is screwed into the connecting frame by passing through the holding member from above the member. The connecting frame and the pressing member can be connected and fastened together.

Protective covers are used when equipment is placed on top of them,
It is preferable to use a metal plate such as a steel plate or a plastic plate such as acrylic resin that is strong enough not to deform even when stepped on by a pedestrian, and the width and length are sufficiently large for the connecting frame and the holding member.
It should be larger than the width of the carpet cutout made to make the conversion connection so that the periphery rests on the carpet, thus completely concealing the conversion connection and the flat cable and preventing foreign objects. It is desirable to eliminate the risk of electrical leakage or short circuits that may occur due to contamination.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 to 4 show the main parts of a conversion connection example preferred according to the present invention.

As shown in the figure, there are 7
A large number of square-shaped carpets 2 with a thickness of about mm and an appropriate width are laid down, and a flat cable 3 is placed on the concrete floor below the carpets. .

The flat cable 3 in this embodiment consists of three flat conductors 4, 5, and 6, such as copper strips, arranged in parallel at a predetermined interval, and plastic sheet-like insulators bonded to them from above and below to form a common insulator. Covering 7
is applied.

The upper surface of the common insulating sheath 7 is provided with a conductive shield 8, such as a copper strip, of such width as to cover the entire width of the sheath.

Among these three conductors, one conductor 5 in the center
is selected as the ground conductor, and the remaining left and right conductors 4 and 6 are used as live conductors.

The conductive shield 8 is used as a grounding protection layer, and is used as a grounding conductor 5 of the cable.
It is conductively connected to via the insulating coating 7 and grounded via the grounding conductor 5.

Although not particularly shown, a plastic insulation sheet is provided below the common insulation coating 7 to prevent the insulation coating 7 from being damaged by minute protrusions protruding from the concrete floor surface. Good to have.

The length of such flat cable 3 is at most 0.5mm.
It consists of a certain thickness.

For such a flat cable 3, a conversion connection kit 13 consisting of a connection frame 9, a plate-shaped pressing member 10, a protective cover 11, and a tightening member 12 is used.

The connection frame 9 is mainly made of a metal plate 14 which is made by cutting a steel plate with a thickness of about 2 mm to an appropriate width and a length larger than the width of the insulation coating 7 of the cable 3, and has both longitudinally extending edges on one side. It is bent to form leg portions 15, 15, and has a predetermined lower recess 16 between the leg portions 15, 15, forming a substantially trapezoidal pedestal shape.

The length of the leg 15 is at most 4 mm, so the height of the lower recess is the same as that length, and the total thickness from the tip of the leg 15 to the upper surface between the legs 15 is is 6mm.

A hole 17 through which a mounting member passes and a screw hole 18 are separately formed in the flat portions at both longitudinal ends of the metal plate 14, and the hole is also formed in the middle.

The upper surface between the legs 15, 15 is flat to provide a connection area for the flat cable, and an insulating plate made of a plate material such as epoxy-impregnated glass fiber that does not easily deform when compressed is installed on the surface of this area. 1
9 is pasted. The thickness of the insulating plate 19 is 1 mm.
degree.

On the upper surface of the insulating plate 19, three terminals 20, 21, 22 are placed at predetermined intervals so as to correspond to the conductors 4, 5, 6 of the cable 3.

Each terminal 20, 21, 22 is made of a copper plate approximately 1 mm thick, bent into a substantially L shape, and has a large number of piercing teeth 24 protruding from the upper surface of a piece 23 extending in one direction from the bent portion. It is. By placing the piece 23 extending on one side on the insulating plate 19, the large number of piercing teeth 24 are exposed on the upper surface.

Cut-out holes 25, which are larger in width than the thickness and width of the terminals, are formed at the mounting positions of the terminals 20, 21, and 22 on the insulating plate 19 and in the metal plate 14 below. A piece 26 extending to the other side of the terminal is passed through the terminal 25 at a distance. The other piece 26 passes through the hole 25 and further connects to the leg part 15,1.
5 and protrudes into a lower recess 16 formed between the holes 5 and 5.

The protruding length of the piercing teeth 24 is preferably made slightly larger depending on the thickness of the insulation coating 7 of the cable.

The insulating plate 19 has screw holes 1 at both ends of the metal plate 14.
8 and 18, and an insulating spacer 27 is placed above and between the portions. The insulating spacer 27 has a thickness substantially equal to the overall thickness of the cable 3, and is used to prevent excessive piercing of the piercing teeth 24 as described later, and has a through hole formed corresponding to the screw hole 18. Ru.

In the lower recess 16 on the lower side of the metal plate 14,
Three insulated wire cores 29, 3 in a common sheath 28
A lead cable 32 having wires 0 and 31 is led in, and the conductor of each insulated wire core 29, 30, 31 is soldered to each terminal 20, 21, 22, respectively.

The connection portion between each wire core and each terminal of such a lead cable is covered with an insulating compound 33 filled in the lower recess 16 to prevent a short circuit of the conductive portion to the metal plate 14 or the like. . The insulating compound 33 is also filled in each hole 25 through the terminal of the metal plate 14, and the terminals 20, 2 are filled with the insulating compound 33.
1 and 22 are isolated, insulated, supported and fixed in the hole 25.

Incidentally, instead of drawing in the lead cable and directly connecting it in this way, a connector connected to the terminal is buried in the insulating compound 25 of the lower recess 16, and a plug terminal is provided at the end of the lead cable for this connector. In this way, the lead cable may be attached to and detached from the connection frame.

The pressing member 10 that corresponds to the connection frame configured in this way has a thickness of 1.5 mm.
This is made of a selected metal plate cut to the length and width of the connecting frame 9 using a steel plate, etc., which is connected to the connecting frame 9. 3 through holes at both ends and in the middle
4, and a screw hole 35 is formed on the outside thereof. The through hole 34 corresponds to the screw hole 18 in the metal plate 14 on the connection frame side.

The protective cover 11 is made of a thin steel plate or acrylic resin plate with a thickness of about 0.5 mm, and is made into a width and length that is sufficiently larger than the pressing member and larger than the planned cutting width of the carpet as described later. It is made of a plate material that has been cut and selected, and its peripheral edge is beveled downward to form a thin trapezoid shape, and through holes 36 are formed at both longitudinal ends. This through hole 36 corresponds to the screw hole 35 of the pressing member 10.

Note that when using a metal plate such as a thin steel plate, it is desirable to coat the surface with an insulating resin or attach an insulating sheet. This is to prevent the current flowing through the conductive shield from leaking in the event of a short circuit due to contact with the pressing member 10 which is stacked in contact with the conductive shield of the flat cable 3, as will be described later. This is to do so.

The tightening member 12 for linking the pressing member 10 to the connection frame 9 uses a countersunk screw with a flat head surface, which is optimal for achieving a flat finish without forming protrusions on the upper surface. It is something. The neck of the countersunk screw formed directly below the head is tapered, and therefore the through hole of the pressing member 10 into which the neck fits is formed with a mortar-shaped taper.

Further, as the screw 37 for linking and fixing the protective cover 11 to the pressing member 10, a countersunk screw similar to the tightening member is suitable. Therefore, the portion of the through hole 36 of the protective cover 11 is also tapered into a mortar shape corresponding to the tapered neck of the screw.

Now, the conversion/connection kit 13 having each component configured as described above can be manufactured in large quantities in advance and stored, and it is good to carry it to the construction site as needed.

As a preparatory step before assembling the delivered conversion connection kit 13, the carpet 2 is connected to the laid flat cable 3 at the position where the conversion connection is desired.
The cable is cut to a width that allows the kit 13 to fit therein, and the flat cable is exposed in the region of this cut.

Once the preparations are completed in this way, we move on to the work of installing Kittu 13.

First, the connecting frame 9, which has been freed by removing the tightening member 11 and the screws 37, is inserted under the exposed flat cable 3, placed on the concrete floor in this state, and the through holes 1 at both ends are inserted.
The installation member is positioned and fixed by pouring it into the concrete floor surface through holes 7.

The flat cable 3 has insulating spacers 2 on both ends.
7, 27, the center ground conductor 5 passes over the center terminal 21, and the live conductors 4, 27 on both sides pass over the center terminal 21.
6 passes over the left and right terminals 20 and 22.

Next, the pressing member 10 is placed above the flat cable 3 so as to cross over it and face the connection frame 9.

Thereafter, each terminal 20, 21,
22 piercing teeth 24 pierce the common insulation sheath 7 from the underside of the flat cable 3. Then, the center terminal 21 comes into pressure contact with the grounding conductor 5, and the left and right terminals 20, 22 come into pressure contact with the live conductors 4, 6, respectively, thereby completing the connection of the flat cable 3 to the connection frame. .

After the connection is made in this way, the protective cover 11 is finally placed on the pressing member 10 and set so that the sloped portion of the peripheral edge rests on the upper surface of the carpet 2, and the screws 37 are screwed into the protective cover. 1
By screwing into the screw hole 35 of the pressing member 10 through the through hole 36 of the protective cover 11, the protective cover 11 is fixed and the connecting portion and exposed cable are hidden.

As a result of assembling the conversion connection kit 13 as described above, the overall height of the stacked members 9, 10, 11 and the flat cable 3 from the concrete floor surface 1 is approximately 10.5 mm, Approximately 7mm thick.

In that case, the protective cover 11 bulges out slightly from the upper surface of the carpet 2, but the shape of the bulge is a trapezoid that is thinner than the carpet 2, so there is no fear of tripping over pedestrians. In addition, such a slightly substantially flat bulging shape also makes it possible to ground equipment and the like.

By configuring the conversion connection to approximate the thickness of the carpet in this way, the conversion connection can be made at any position on the cable, eliminating positional restrictions.

Now, the conversion connection section configured as described above can be used for both power supply and power supply.

When using it as a power source, there are two main methods: connecting it to a power cable that runs through the floor, and connecting it to a conversion box on the floor. In the former case, the conversion connection is constructed near the outlet section constructed on the floor duct or cellular duct buried in the concrete floor, and the lead cable 32 is led out from the connection frame of the conversion connection. can be drawn into the joint box of the outlet section and connected to the power cable running inside the duct.

In the latter case of the floor-mounted connection method, the conversion connection is installed near the wall-mounted or free-standing conversion box, and the lead cable in the connection frame is run up through the carpet and placed inside the box. Just pull in and connect.

These methods are economically advantageous because they are much simpler work than the conventional method of setting up flat cable terminals, and also lead to the simplification of the conversion box. In addition, when using an outlet embedded in a wall or the like as a power source, this can easily be done by connecting a plug to the extended end of the lead cable.

On the other hand, when using it for power supply,
When connecting directly to a device on the floor or connecting it to a round conductor outlet installed as appropriate, the lead cable can be drawn into the device or attached to the terminal of a raised lead cable in the same way as the power conversion connection method. All you have to do is plug it in.

If the starting part of the lead cable is exposed, it is a good idea to cover it with a molding, etc.

It can also be used for conversion connection to partitions with internal wiring. In this case, run the lead cable at the conversion connection on the carpet,
All you have to do is pull it into the partition and connect it to the internal wiring. Therefore, unlike conventional flat cable connection methods to the partition, special processing and special terminal blocks are required for the partition. There is no need to incorporate .

Furthermore, this system can handle cases in which the partition extends at right angles to the flat cable as well as in cases where it crosses the lead cable diagonally by simply standing up the lead cable. There is no need to change the direction of the cable by bending it.

〔Effect of the invention〕

As explained above, according to the conversion connection kit of the present invention for carpet underlay cables, the connection can be easily tightened and connected using commonly available tools without the need for specially manufactured special jigs and tools. Flat cables can be used with almost no processing, such as cutting the upper conductive shield, and the thickness of the conversion connection can be approximated to the thickness of the carpet. It can be configured in any position, and can be flexibly adapted to the arrangement of mating wiring and equipment, and can also be easily removed or relocated by operating the tightening member. The flat cable has the effect of being able to be reproduced by extremely simple measures such as applying an insulating sheet to the hole punched by the piercing teeth in the lower insulation coating, which greatly contributes to the ease of implementation of this type of conversion connection. It is something to do.

[Brief explanation of drawings]

The attached drawings show an example of the conversion connection in the carpet underlay cable of the present invention, FIG. 1 is an exploded perspective view showing the correspondence between the conversion connection kit and the flat cable connected by the conversion connection kit, and FIG. A plan view showing the relationship between the connection frame and the flat cable with parts mounted on the cable removed, Figure 3 is a front sectional view showing the connection situation from the cross-sectional side of the cable, and Figure 4 is the cable. FIG. 3 is a side sectional view showing the connection situation from the side direction. -Explanation of symbols-, 1: Concrete floor surface, 2:
carpet, 3: flat cable, 4, 6: live conductor, 5: ground conductor, 7: common insulation covering,
8: Conductive shield, 9: Connection frame, 10: Pressing member, 11: Protective cover, 12: Tightening member, 13: Conversion connection kit, 14: Metal plate, 1
5: Leg-shaped portion, 16: Lower recessed portion, 19: Insulating plate, 2
0, 21, 22: terminal, 24: piercing tooth, 3
2: Lead cable.

Claims (1)

[Claims] 1 A kit used when constructing a conversion connection for a flat cable placed between a floor surface and a carpet laid on top, the upper side of which is covered with a conductive shield. A connecting frame provided between the flat cable and the floor surface, a pressing member provided above the flat cable, a tightening member linked between the pressing member and the connecting frame, and a clamping member connected to the pressing member. The connection frame further includes a protective cover provided on the upper side, a base plate having a recess formed on the lower side, a terminal having a large number of piercing teeth insulated and supported on the upper surface of the base plate, and one end attached to the terminal. A conversion connection kit for a carpet underlay cable, characterized in that it has a lead cable connected to the lead cable and passed through the lower recess of the base plate.