JPH0522449B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a metal duct material splicing device, and relates to a metal duct material having a substantially groove-shaped cross section and used for collectively supporting insulated wires and various cables. Improved metal duct material that allows for simple and quick connections at the installation site, as well as ensuring electrical continuity between metal duct materials that have been treated with a surface treatment film for weather resistance and rust prevention. This invention relates to a splicing device.

(Prior Art) Conventionally, metal wires with a width of 5 cm or less, called raceways, or metal ducts with a width of more than 5 cm, which have a substantially groove-shaped cross section, have been used in various types and structures. Many of them have special features that take into consideration weather resistance, rust resistance, salt resistance, moisture resistance, chemical resistance, etc., in order to cope with changes in the environment at the installation site. Surface treatment has been applied. Examples include melamine baking coating, powder coating and electrodeposition coating (epoxy resin coating) with excellent anti-rust properties, and other synthetic resin coatings. However, these special surface treatment films do not have conductivity, and in particular, there is no conductivity between the metal duct materials to which the surface treatment films are connected and installed, so electrical conductivity may occur in the insulated wires and cables that support the wiring. This was extremely inconvenient because leakage current could not be avoided.

Therefore, a connecting device has been proposed in which the surface treatment film is penetrated to achieve mutual conductivity between the connecting members (see Japanese Utility Model Publication No. 5757/1983). In this device, a needle protrusion formed on the abutting surface of a nut is brought into contact with the surface treatment film, and the needle protrusion pierces the surface treatment film to establish an electrical connection through the nut.

(Problem to be solved by the invention) However, in the conventional coupling device, the needle protrusion breaks through the coating of paint, etc., but the recent paint
With the development of technology, it is now possible to increase the thickness of the coating, and many coatings with increased surface hardness are now in use. This makes it difficult for the needle protrusion to break through such a thick film type or highly hard coating, and there is a possibility that sufficient electrical contact may not be obtained.

Moreover, since this connecting device uses a nut provided with a needle protrusion, a lot of processing is required for the connecting device. That is, a concave portion is formed on the surface of the connecting member located inside of the members to be overlapped and connected, and the nut is fixed. On the other hand, a bolt is inserted from the surface of the outer member into the inside, and this bolt is screwed into a nut inside the member. The tip of the bolt presses against the concave portion of the connecting member located inside, thereby pressing the needle protrusion of the nut against the inner side surface of the member located on the outside. Therefore, to use this coupling device, set the nut in the recess of the coupling member, insert the coupling member into the member in this state, and then insert the bolt from the surface of the member toward the nut inside the member. It takes a lot of work to insert the . As a result, as a connecting device for metal duct materials that requires connecting a large number of members, the work is extremely troublesome and the connecting work is hindered.

In addition, since the point where the needle protrusion pierces the coating film is the inner surface of the connecting member, it is difficult for the operator to judge whether or not sufficient conduction has been achieved.

Therefore, the present invention was made to eliminate the conventional drawbacks, and it is possible to realize reliable electrical continuity while simultaneously connecting metal duct materials, and has excellent corrosion resistance to maintain electrical continuity for a long period of time. The purpose of the present invention is to provide a splicing device for metal duct materials that can be maintained.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a splicing device that is interposed at the connection portion between metal duct materials coated with a non-conductive surface treatment film. The fastening means includes a conductive fitting that connects the metal duct materials with their ends abutted against each other, and a conductive fitting that is forcibly fitted into a bolt insertion hole of the fitting to enlarge the bolt insertion hole. A conductive joint bolt with a square root that opens and ruptures the surface treatment film at the penetrating part, and a screw-shaped rupture that pushes the surface treatment film that comes into pressure contact with itself as it is screwed into the joint bolt. A conductive nut having a protrusion formed thereon.

(Function) In the metal duct material splicing device of the present invention,
When connecting metal duct materials to each other at a site where metal duct materials are to be laid, the surface treatment film applied to the metal duct materials is ruptured at the connection site to establish electrical continuity between the metal duct materials. .

At this time, the ends of the metal duct materials are connected to each other in a butt-like manner, a joint is placed between the ends of the metal duct materials, and a fastening means is used to fasten them with screws. That is, when a fastening means equipped with joint bolts and nuts is interposed at the connection portion between metal duct materials, the surface treatment film is not ruptured by the joint bolt that is penetrated or by the nut that is screwed into the joint bolt. Ru.

Then, the surface treatment film on one of the metal duct materials is broken, and an electrical route is formed directly or indirectly through the fastening means interposed between the conductive fabrics.

As a result, electrical continuity between the metal ducting materials is achieved, avoiding leakage currents that may occur in the cables being routed.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

The reference numeral 1 shown in the figure is a metal duct material that is connected to each other by the device of the present invention, and as shown in the figure, basically, the cross-section of parallel left and right side plates facing each other connected by a bottom plate is approximately It has a groove shape and is used as a metal wire called a raceway with a width of 5 cm or less, or as a metal duct with a wider width. This metal duct material 1 has a surface treatment film 2 applied to both the left and right side plates and the bottom plate to improve weather resistance, rust resistance, salt resistance, moisture resistance, chemical resistance, etc. This surface treatment film 2
As in the past, these are melamine baked coatings, powder coatings, electrodeposition coating finishes (epoxy resin coatings), and other synthetic resin coatings.

Therefore, when the metal duct materials 1 configured as described above are connected to each other, the connection is performed via the conductive fastening means 10 that breaks the surface treatment film 2.

That is, the fastening means 10 is an outer coupling type or inner coupling type fitting 1 that connects the ends of the metal duct material 1 in abutting manner.
2, and at that time, it is forcibly fitted into the bolt insertion hole 11 and the bolt insertion hole 11 is
A conductive joint bolt 14 is provided with a square root 15 that expands and breaks the surface treatment film 2 at the inserted portion, and a surface treatment film that is pressed into contact with the joint bolt 14 as it is screwed into the joint bolt 14 is attached to its surroundings. A conductive nut 16 having a screw-shaped breakage protrusion 17 formed therein is used.

This screwed part breaks the surface treatment film 2 and comes into contact with the fabric, thereby establishing electrical continuity between the fabrics at the ends of the conductive metal duct material 1. At that time, the metal duct material 1 on one side and the metal duct material 1 on the other side are electrically connected to each other by interposing the screwed parts, and the electrical continuity is established directly by the screwed parts or by other metal ducting materials interposed as necessary. It is indirectly acted upon by a conductive member.

Next, specific structural examples of the fastening means 10 will be described as <Example 1> to <Example 9>.

Example 1 As shown in FIGS. 1 and 2, two circular bolt insertion holes 11 are drilled on the left and right sides of the joint area at the end of the metal duct material 1, and the end surface is Left and right side plates at the ends that serve as patches,
An outer coupling type fitting 12 having a substantially groove-shaped cross section is fitted in contact with the outer surfaces of the bottom plates,
A substantially horizontally elongated joint elongated hole 13 that matches the position of the bolt insertion hole 11 is drilled. In addition, as shown in the figure, the bolt insertion hole 11 and the joint elongated hole 13 are
The bolts 14, which will be described later, are provided on the left and right side plates of the metal duct material 1 and the joint fittings 12, respectively, and have round-shaped heads located inside the metal duct material 1. To prevent damage to the coating.

On the other hand, at the base of the threaded part of the joint bolt 14 that is inserted into the bolt insertion hole 11 and the joint elongated hole 13,
A square root part 15 that penetrates the joint elongated hole 13 but does not come into contact with the inner edge thereof and does not idle, and has a substantially rectangular cross section with a diagonal line longer than the inner diameter of the bolt insertion hole 11.
form. As shown in the figure, a nut 16 with a washer is screwed into the joint bolt 14 itself to fasten the metal duct material 1 and the joint fitting 12.

Note that the surface of the joint 12 is also coated with a surface treatment film 2 in the same manner as the metal duct material 1, and in order to break it, a breaking protrusion 17 is formed on the back surface of the nut 16. As shown in FIG. 4, this breaking protrusion 17 is formed by continuously forming small serrated protrusions along the outer edge of the nut with end surfaces that are substantially perpendicular in the screwing direction. Although not shown, the breaking protrusion 17 may be formed by knurling, and the point is that the surface treatment film 2 may be broken as the screw is screwed in, and the breaking protrusion 17 may be brought into contact with the surface of the fabric.

According to this embodiment, when the nut 16 is screwed into the joint bolt 14 inserted through the bolt insertion hole 11 and the joint elongated hole 13, the square root portion 15, which is larger than the inner diameter of the bolt insertion hole 11, is inserted into the bolt insertion hole 11. As shown in Fig. 2, the inner edge of the bolt insertion hole 11 and the fitting 1
The surface treatment film 2 applied to the two surfaces is broken, and electrical continuity is obtained. That is, one metal duct material 1, one joint bolt 14, one nut 1
6, an electrical route is formed for the joint 12, the other nut 16, the other joint bolt 14, and the other metal duct material 1. In this embodiment, the square root part 15 of the connecting bolt 14 does not have a substantially rectangular cross section as shown in the drawings, but may have a triangular or polygonal shape of pentagon or more, which is arbitrary.

Embodiment 2 As shown in FIG. 3, two substantially horizontally elongated joint slots 13 are drilled at each joint site at the end of the metal duct material 1, and the end surfaces are butted. A circular bolt that matches the position of the bolt insertion hole 11 is inserted into the inner coupling fitting 12, which has a substantially groove-shaped cross section and is attached to the inner surfaces of the left and right side plates and the bottom plate at the ends thereof. Hole 1
Open 1. Note that the other structures are the same as in the first embodiment.

Embodiment 3 In FIG. 5, the square root part 1 of the joint bolt 14
A concave or convex recess 18 is formed on the circumferential surface of the joint bolt 14 in the length direction of the joint bolt 14, and is formed by hettering, knurling, or wing-shaped punching, for example, as shown in the figure. Shape it into a straight vertical groove like this. Other structures are Example 1
Or it is the same as 2. Note that the square root portion 15 is
As shown in Figure 5, the diameter is the same from the tip of the thread to the head, or as shown in Figure 5, the diameter gradually increases from the tip of the thread to the head. In this case, smooth insertion into the bolt insertion hole 11 can be achieved. In addition, as shown in Fig. 5, there are four triangular blade-shaped protrusions at the base of the thread that gradually become wider as the tip of the thread reaches the head.
1. The force of biting into the surface treatment film 2 at the inner edge of the joint elongated hole 13 may be increased.

Embodiment 4 In FIG. 6, the square root portion 1 of the joint bolt 14 is the same as in Embodiment 1 or 2.
A vertical groove 19 having a substantially serrated cross section on the circumferential surface of 5.
was formed. This vertical groove 19 may be linear along the length direction of the joint bolt 14 or may be curved.

According to Examples 3 and 4, the breaks in the surface treatment film 2 on the inner edge of the bolt insertion hole 11 are divided into smaller pieces to further ensure electrical continuity, and according to the curved vertical groove 19 of Example 4, the nut When the joint bolt 14 is slightly rotated when screwed into the joint bolt 16, the surface treatment film 2 is further broken.

Embodiment 5 In FIG. 7, the square root portion 15 of the joint bolt 14 is the same as each of the above-mentioned embodiments, but
The tip of the screw part is a tapered surface that gradually becomes larger in diameter as it reaches the head. according to this,
When screwing into the nut 16, the square root portion 15 quickly and smoothly enters the bolt insertion hole 11 and the joint elongated hole 13, making it easy to break the surface treatment film 2 on the inner edges thereof.

Embodiment 6 In FIGS. 8 and 9, a conductive member, e.g. , a copper plate 20 (cutper plate) (see FIG. 8), and a bond wire 21 (see FIG. 9). With this conductive member,
One metal duct material 1, one joint bolt 14,
An electrical route is formed between one nut 16, the conductive member (copper plate 20, bond wire 21), the other nut 16, the other joint bolt 14, and the other metal duct material 1. In this way, the conductive member (copper plate 2
0, bond wire 21) provides more reliable electrical continuity between the screwed parts.

Example 7 In FIG. 10, sustained metal duct material 1
A pair of joint bolts 14 inserted through each other
, the interconnection board 23 that spans the metal duct material 1
The connecting board 23 is provided with a sharp breaking protrusion 24 that breaks the surface treatment film 2.

Similar to the sixth embodiment, the interconnection board 23 is constructed so as to straddle the metal duct materials 1 to be connected.
In addition, the joint bolts 14 are inserted through each of the metal duct materials 1, and the nuts 16 are screwed in. As the joint bolts 14 are screwed in, the joint bolts 14 are drawn, and the breakage projections 24 are formed on the surface of the metal duct materials 1. It digs in and breaks the surface treatment film 2 on the surface of the metal duct material 1.

Embodiment 8 In FIG. 11, the fittings 12 are made up of a pair of left and right parts having a substantially L-shaped cross section, and each of the left and right parts is formed by connecting the left and right side plates of the metal duct material 1, the left and right side plates, and the side edges of the bottom plate. It is intended to be mounted in contact with the continuous part of the Then, as shown in FIG. 11, it may be attached to the outer surface of the metal duct material 1, or it may be attached to the inner surface of the metal duct material 1, as shown in FIG. .

Embodiment 9 In FIG. 12, when the back side of the head of the joint bolt 14 comes into contact with the metal duct material 1 or the joint fitting 12, the surface treatment film 2 is broken at the contact portion on the back side of the head. That's what I did. That is, as shown in FIG. 12, a ring-shaped broken ridge 26 is formed along the periphery of the head at the abutting portion on the back surface of the head, or as shown in FIG. Uneven surface-like fracture protrusion 2 formed on the back surface
Let's say 7.

(Effects of the Invention) As described above, the present invention can simultaneously connect metal duct materials to each other and ensure electrical continuity therebetween.

That is, instead of the method in which the needle protrusion breaks through a coating such as paint as in the conventional coupling device, the needle protrusion is forcibly fitted into the bolt insertion hole 11.
By using a conductive splicing bolt 14 with a square root portion 15 that expands and ruptures the surface treatment film 2 at the insertion portion, the splicing bolt 14 can be inserted into the bolt insertion hole 11.
The joint bolt 14 can be firmly fixed to the joint bolt 14 to prevent it from spinning idle, and the tightening force of the nut 16 can be made extremely high. Therefore, the insufficient conduction effect due to point contact, such as electrical conduction through the needle protrusion formed on the contact surface of the conventional nut, has been improved to a reliable conduction effect.

Furthermore, by using a fastening means using a conductive nut 16 having a screw-shaped breakage protrusion 17 that pushes the surface treatment film 2 that presses into contact with the joint bolt 14 to its surroundings. , the surface treatment film 2 can be pushed around the nut 16, and the metal fabric of the metal duct material and the fracture protrusion 17 are in reliable contact over a wide area. Further, the surface treatment film 2 pressed around the nut 16 protects the area around the nut 16 and the peeled metal fabric. As a result, the clothing treatment after establishing electrical continuity can be performed at the same time, eliminating the risk of loss of electrical conductivity due to rust generated from exposed parts of the metal material.

Furthermore, while the square root portion 15 of the joint bolt 14 expands the bolt insertion hole 11 and is strongly tightened,
The broken protrusion 17 of the nut 16 can be sufficiently pressed against the surface of the metal duct material. Therefore, even thick or hard coatings can be reliably removed.

As described above, according to the present invention, it is possible to easily connect metal duct materials to each other and at the same time realize reliable electrical continuity, and also to maintain electrical continuity for a long period of time due to excellent corrosion resistance. Therefore, there is no need to separately perform electrical connection work, which simplifies on-site work and greatly contributes to increased work efficiency.

[Brief explanation of drawings]

The drawings show embodiments of the present invention. Fig. 1 is an exploded perspective view of Embodiment 1 of the present invention in use, and Fig. 2 shows the fracture of the surface treatment film at the bolt insertion hole. is a front view of the main part, that is a cross-sectional view of the main part before breaking, FIG. 3 is an exploded perspective view of the second embodiment in a state of use, FIG. FIG. 6 is a perspective view of the joint bolt in Example 4, FIG. 7 is a sectional view of the joint bolt in Example 5 in use, and FIGS. 8 and 9 each show the use in Example 6. FIG. 10 is also a perspective view of Example 7, and FIG. 11 is a cross-sectional view of Example 8, and FIG.
2, each is a perspective view of a joint bolt in Example 9. 1...Metal duct material, 2...Surface treatment film, 10
...Fascinating means, 11... Bolt insertion hole, 12...
Joint hardware, 13... Joint long hole, 14... Joint bolt, 15... Square root, 16... Nut, 17...
Fracture protrusion, 18... Biting part, 19... Vertical groove, 20
...Copper plate, 21... Bond wire, 22... Broken ridge, 23... Interlocking board, 24... Broken protrusion, 26...
...Fracture protrusion, 27...Fracture protrusion.

Claims (1)

[Scope of Claims] 1. A fastening means is provided between the connecting parts of metal duct materials coated with a non-conductive surface treatment film, and this fastening means pushes the ends of the metal duct materials together. A conductive fitting is connected as a mating piece, and a conductive fitting is forcibly fitted into the bolt insertion hole of the fitting to enlarge the bolt insertion hole and has a square root that breaks the surface treatment film at the insertion part. joint bolt and
A metal duct joining device characterized by comprising a conductive nut having a screw-shaped fracture protrusion that pushes the surface-treated film that presses against itself as it is screwed into the joining bolt. . 2. The metal duct material joining device according to claim 1, wherein the joining hardware has a substantially groove-shaped cross section and is attached to the left and right side plates and the outer surface of the bottom plate of the metal duct material. 3. The metal duct material joining device according to claim 1, wherein the joining hardware has a substantially groove-shaped cross section and is attached to the left and right side plates and the inner surface of the bottom plate of the metal duct material. 4. The metal duct material according to claim 1, wherein the joint fittings are a pair of left and right fittings having a substantially L-shape in cross section and are attached to the left and right side plates and the outer surface of the bottom plate side edges of the metal duct material. splicing device. 5. The metal duct material according to claim 1, wherein the fittings are a pair of left and right fittings having a substantially L-shaped cross section and are attached to the left and right side plates of the metal duct material and the inner surface of the side edges of the bottom plate. splicing device.