JPH04325816A - Joint box - Google Patents

Abstract

PURPOSE:To simplify connection of wire as compared with a quick connection system by employing a harness joint structure entirely on the branch side except for a part where a power cable is connected. CONSTITUTION:Four cable joints 2a, 2b, 2b' are provided. A power cabled is connected to the joint 2a, a wiring fixture cable is connected to the joint 2b, and a feeder cable is connected to the joint 2b'. Three sets of terminal blocks 301-303 for branching 6 power supply line into three branches are contained in a joint box. The first and second joints 2a, 2b, 2b' are formed projecting from the end faces of the body 10 and a cover 20 with the end face of the first joint 2a being recessed in the center. Three core inserting holes are made through the recessed face perpendicularly therewith and the ends thereof are made thin so that the cores can be inserted positively between connecting terminals and lock springs. The second joints 2b, 2b' are provided with three holes receiving the blades of a harness plug thus providing a reverse insertion preventing structure.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint box used for branching power lines in an indoor wiring system.

0002

[Prior Art] Recent indoor wiring systems use so-called raised floors in tenant buildings where a wiring space is provided for power cables to be routed between the underfloor slab and the floor, and the wiring is routed according to the indoor layout. This type of indoor wiring system uses a joint box to branch out multiple power lines.

0003

[Problem to be solved by the invention] However, in the conventional joint box used in this type of indoor wiring system, the cables for sending and wiring the power line were connected using a quick connection method, making the connection work troublesome. There was a problem. The above-mentioned quick connection method means that when the core wire of a power cable, etc. is inserted into the insertion hole formed in the connection part of the joint box, the core wire is elastically clamped between the terminal plate and lock spring provided inside, and the wire is This is the method by which the connection is made.

The present invention has been made in view of the above-mentioned points, and its object is to provide a joint box that allows easy wiring work.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a first connecting portion with a quick connection structure for connecting a power cable, and a power line connected to the first connecting portion. The harness connection structure includes a plurality of second connection parts serving as branch ends of a plurality of branches, and connects the second connection parts to a harness plug attached to a cable on the branch side of the power line.

[0006] In order to prevent incorrect connection of the cable where the polarity of the power source becomes a problem, it is preferable to provide a structure for preventing reverse polarity at the second connection portion which is a branch end to a wiring device or the like.

[0007]

[Function] As described above, the present invention uses a harness connection structure for all the connection parts on the branch end side except for the part where the power cable is connected, making it easier to connect the feed wiring compared to the quick connection method. It has been made possible to do so.

[0008]

Embodiment FIGS. 1 to 4 show an embodiment of the invention. As shown in FIG. 2, the joint box of this embodiment includes four connection parts 2a, 2b, and 2b' for connecting cables. Here, a power cable L0 is connected to the connecting portion 2a, an appliance cable of a wiring device is connected to the connecting portion 2b, and a cable L1 for sending and wiring is connected to the connecting portion 2b'. Three sets of terminal blocks 301 to 303 for branching the power line into three are housed inside this joint box.

The body of this joint box is composed of a body 10 and a cover 20 made of synthetic resin, as shown in FIG. The body 10 is box-shaped with an open top.
The interior is separated into left and right storage spaces by a central partition wall 11,
The left storage space on the side where the connecting portion 2a is formed is further divided into three sections by two vertically running partition walls 12, and the other right storage space is divided into three sections by a notch 13 formed in the center of the central partition wall 11.
There are two partition walls 141 and 14, respectively, leaving a continuous part.
It is divided into three sections by 2. In addition, the central partition wall 11
A boss portion 15 having a through hole for a screw to be screwed to the construction surface is formed in the center of the construction surface.

On the other hand, the cover 20 is formed into a box shape with an open bottom, and has an internal structure substantially similar to the body 10 described above. A grommet stud 40 is placed at the appropriate place on the top surface of this cover 20.
The eyelet stud 40 is passed through the insertion hole 261 and the insertion hole 262 formed in the outer wall of the body 10 so as to communicate with the insertion hole 261 , and the eyelet stud 40 is attached to the body 10 by caulking. be done.

[0011] The first and second connecting portions 2a, 2b, 2
b' is formed to protrude from the end surfaces of the body 10 and the cover 20. Here, the center of the end surface of the first connecting part 2a is recessed, and three core wire insertion holes 41 are perpendicularly bored in the recessed surface, and each core wire insertion hole 41 is connected to each section of the left storage space. The core wire is connected to the core wire and has a thin tip so that the core wire can be reliably inserted between a connection terminal 31 and a lock spring 34, which will be described later.

The second connecting portions 2b and 2b' are formed in a substantially rectangular parallelepiped shape to fit into the recess 53 of the harness plug B shown in FIG. Three plug blade insertion holes 42 are formed. The inside of these connecting parts 2b and 2b' are partition walls 141 and 1
A blade holder spring body 3, which will be described later, is installed in each section separated by 42.
It has a structure in which the second blade receiving part 33 is accommodated. Two grooves 44 running vertically are formed on the upper surface of the connecting portion 2b, and these grooves 44 are connected to protrusions (not shown) formed on the upper bottom surface of the recess 53 of the harness plug B. Something that fits,
This prevents the harness plug B from being inserted backwards. If the formation positions of the groove 44 of the joint box and the protrusions of the harness plug B are made different depending on the rating, it is possible to prevent harness plugs B of different ratings from being connected. A groove 43 running laterally is further formed between these grooves 44, and a claw (not shown) protruding into the recess 53 of the locking body 51 of the harness plug B is engaged with the groove 43. , has a structure that prevents the harness plug B from coming off.

Furthermore, the connecting portion 2b' is connected to the first connecting portion 2a.
It is formed on the opposite side of the
Unlike other connection parts 2b, there is no problem with inserting it backwards.
The groove 44 is not formed. However, in the case of this embodiment, although the grooved line 43 is not formed in the connecting portion 2b', it goes without saying that it is preferable to form the grooved line 43. The terminal block 301 has a terminal plate portion 34 formed in a substantially U-shape that opens laterally at one end, a connecting terminal 311 having a blade receiving portion 33 formed at the other end, and a connecting terminal 311 having a blade receiving portion 33 formed at both ends. The connecting terminal 321 is formed with a connecting piece 361 whose central part is bent at right angles between the respective blade receiving parts 33, the connecting terminal 311, and the blade receiving spring body 321.
a lead terminal 351 that connects the terminal plate portion 34;
The lock spring 39 is housed in the lock spring 39.

The terminal block 302 has a connecting terminal 3 having the same shape as the connecting terminal 311 of the terminal block 301.
12, a blade receiving part 33 is formed at both ends, and a double-edged receiving part 33
A connecting terminal 322 connected by a connecting piece 362 with a straight line and a vertical step, a lead terminal 352 connecting the connecting terminal 312 and the connecting terminal 322, and a lock spring 39 housed in the terminal plate part 34. It consists of.

The terminal block 303 has a connecting terminal 3 having the same shape as the connecting terminal 311 of the terminal block 301.
13 and a connecting terminal 323 formed with blade receiving parts 33 at both ends and connected by a connecting piece 363 whose central part is bent at right angles in a direction opposite to that of the connecting terminal 321. It consists of a lead terminal 353 that connects the terminal 313 and the connecting terminal 323, and a lock spring 39 that is housed in the terminal plate section 34.

[0016] Here, the connection terminals 311 to 313, 3
Dowels 37 and 38 are formed at the appropriate positions of 21 to 323,
The dowels 37 and 38 are caulked into the holes of the mounting pieces formed at both ends of the lead terminals 351 to 353, and the connection terminals 311 to 313 and the connection terminal 321 of the corresponding blocks are respectively attached.
~323 Connect each other. The above connection terminal 311 ~
313 and the connecting terminals 321 to 323 are connected to each other before being assembled into the body 10. To assemble each terminal block 301 to 302 into the body 10, the terminal block 303 is housed in the body 10 in such a way that the connecting terminal 303 is housed in the section closest to the center partition wall 11 in the left storage space, and the connecting terminal 312 is housed in the body 10. The terminal block 302 is stored in the center compartment, and the terminal block 301 is stored in the outermost compartment with the connecting terminals 311 stored therein.

In this manner, the cover 20 is attached to the body 10 with the terminal blocks 301 to 303 housed therein. Note that when installing this cover 20, the terminal plate portion 34
A release button 45 is housed therein for releasing a wire connection portion having a quick connection structure consisting of a lock spring 39 and a lock spring 39. Here, press the cancel button 45.
is each lock spring 3 of each terminal block 301 to 303
This simultaneously releases the elastic contact state of the electric wires due to 4.
An operation hole 25 for operating the release button 45 is formed in the protruding surface of the connecting portion 2a of the cover 20 corresponding to the storage location of the release button 45, and a tool such as a screwdriver is inserted through the operation hole 25. When the release button 45 is operated, the electric wire can be removed.

[0018] The second part of the joint box having the above structure
When connecting the harness plug B to the connecting part 2b, align the recess 53 of the harness plug B with the second connecting part 2b and press the harness plug B against the connecting part 2b. The blade 50 is inserted into the blade insertion hole 42, and the blade 50 is elastically held by the blade receiving part 33 provided inside the connecting part 2b.

When the connecting part 2b is completely pushed into the recess 53 of the harness plug B, the claw of the locking body 51 engages with the groove 43 formed on the outer surface of the connecting part 2b, and the harness plug B is not pulled out. is prevented. Above harness plug B
When removing the harness plug B from the connection part 2b, push the rear end of the lock body 51 to release the engagement of the claw with the groove 43, and at this time pull the harness plug B backward to remove it. can.

Power cable L0 to first connection 2a
For connection, when the core wire is inserted into the insertion hole 41, the core wire is elastically held between the terminal plate portion 34 and the lock spring 39, and the power cable L0 is connected. A floor wiring system using the joint box A described above will be explained. Figure 3
shows the floor wiring system.In this building, the floor F is a so-called free access floor formed on the slab at regular intervals, and the floor wiring is carried out using the space between the slab and the floor F. It is designed to do this. In this floor wiring system, multiple outlets C are buried in the floor, wiring devices H and I such as multiple outlets are arranged on the floor, and the appliance cables of the wiring devices H and I are led under the floor by a demarcation box D. There it is. Then, attach a harness plug B to the tip of the appliance cable of the outlet C and the wiring appliances H and I, respectively, and connect the power cable L to the connection part 2a.
Harness plug B is connected to connection parts 2b and 2b' which are the branch ends of the power line by joint box A to which 0 is connected. In addition, in this floor wiring system, the branched power line is further branched using a joint box A. As shown in this floor wiring system, if joint box A is placed at an appropriate location under the floor, the power line can be branched and connected to wiring devices as needed, and wiring devices can be moved when changing the layout. Easily accommodates expansion.

[0021]

Effects of the Invention As described above, the present invention includes a first connection part with a quick connection structure for connecting a power cable, and a plurality of branch ends that are branched from a plurality of power lines connected to the first connection part. The harness connection structure is such that the harness plug attached to the cable on the branch side of the power line is connected to the second connection part of the power line, so that all parts except the part where the power cable is connected are connected to the second connection part of the power line. By using a harness connection structure for the connection part on the branch end side, the feed wiring can be connected more easily than the quick connection method, and the wiring work is easier. In addition, if a reverse polarity prevention structure is provided at the second connection portion that is a branch end to a wiring device, etc., it is possible to prevent incorrect connection of the cable where the polarity of the power source becomes a problem.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is a perspective view of the same as above.

FIG. 3 is a system configuration diagram of a floor wiring system using the above.

FIG. 4 is a perspective view showing a harness plug connected to the same.

[Explanation of symbols]

A Joint box 2a First connection part 2b, 2b Second connection part L0 Power cable B Harness plug

Claims (2)

[Claims] Claim 1: A joint box used for branching multiple power lines, comprising a first connection part with a quick connection structure for connecting a power cable, and a power line connected to the first connection part. A joint box comprising a plurality of second connection parts serving as branch ends of a plurality of branches, and configured as a harness connection structure for connecting the second connection parts to a harness plug attached to a cable on the branch side of a power line. 2. The joint box according to claim 1, wherein the second connection portion, which is a branch end to a wiring device, is provided with a structure to prevent reverse insertion.