JPS62225118A - Method and metal fittings for jointing cable rack - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a cable rack splicing method and its splicing fittings, which are used to bundle and support various cables. An improved joining method for cable racks that allows for simple and quick connections at the installation site, and at the same time ensures electrical continuity between cable racks that are coated with a surface treatment film for weather resistance and rust prevention. and related to fittings.

(Prior art) Various types and structures of this type of cable rack have been proposed in the past, and most of them are weatherproof and waterproof to cope with changes in the environment at the installation site. Special surface treatments are applied in consideration of rust resistance, salt resistance, moisture resistance, chemical resistance, etc.

Examples include melamine baking paint, paraquat finish (epoxy resin paint) with excellent rust prevention properties, and other synthetic resin paints. However, these special surface treatment membranes are not conductive, especially between the cable racks to which they are connected, making it impossible to avoid leakage currents that can occur in the cables being supported. , which was extremely inconvenient.

In order to solve this problem, the applicant proposed
Publication No. 0 proposes an earth bond for establishing electrical continuity between cable racks. This has a structure in which a metal conductive wire of a length spanning the cable racks is connected to each other by a conductive tapered pin that is driven into the hole from which the surface treatment film has been peeled off.

(Problems to be Solved by the Invention) <Problems with the Prior Art> According to the conventional earth bond construction method described above, drilling of holes for connecting the earth bonds, separate from the work of connecting the cable racks to each other, The work of driving the tapered bottle is required, which is troublesome. Moreover, many of these connection operations are usually carried out at high places at the installation site, and as a result, small parts and the like are easily dropped or lost.
Working on unstable scaffolding is also dangerous.

<Technical Problem> Therefore, the present invention has been made to solve the conventional drawbacks, and provides a cable rack splicing method and method that can realize electrical continuity at the same time as connecting cable racks together and simplify the work. The purpose is to provide such fittings.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a splicing method in which cable racks each having a non-conductive surface treatment film are connected to each other. The cable racks are characterized in that the connection is made through electrically conductive fastening means that ruptures the surface treatment film, thereby bringing the cable racks into a mutually conductive state.

Furthermore, the fitting used to carry out the joining method includes a fastening means interposed between the connecting parts of the cable racks, which are coated with a non-conductive surface treatment film, and this fastening means: The surface treatment membrane of one cable rack,
It is characterized by having an electrically conductive screw fastening part that breaks the surface treatment film of the other cable rack.

(Function) In the cable rack joining method and its joining fittings of the present invention, at the site where the cable rack is to be laid,
When the main girder members of the cable racks are connected to each other, the surface treatment film applied to the cable racks is broken at the connection site to establish electrical continuity between the cable racks.

In this case, the surface treatment film is broken by electrically conductive fastening means that connect the cable racks to each other. That is, when screwing parts, specifically, fastening means equipped with joint bolts and nuts, are interposed at the connection parts of cable racks, the surface treatment film on the main girder member of the cable racks is penetrated. It is broken by the joint bolt or by a nut screwed into the joint bolt.

Then, the surface treatment film on one cable rack is ruptured, and an electrical route is formed directly or indirectly through the joint bolts and nuts that are interposed between the conductive fabrics.

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

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

Reference numeral 1 shown in the figure is a cable rack that is connected to each other according to the present invention, and as shown in the figure, basically, a pair of left and right main girder members 2 facing each other in a parallel manner are connected at a predetermined interval. A plurality of sub-girder members 3 are strung across the structure so that the entire structure has a substantially ladder shape. This cable rack 1 has a surface treatment film 4 applied to both the surfaces of the parent girder member 2 and child girder member 3 to improve weather resistance, rust resistance, salt resistance, moisture resistance, chemical resistance, etc. ing. This surface treatment film 4 is a melamine baked coating, a paraquat finish (epoxy resin coating), or another synthetic resin coating, as in the conventional case. Although not shown, the same applies to a cable rack whose entire cross section is substantially groove-shaped.

However, the cable rack 1 configured in this way
When connecting each other, please use surface treatment MS! This is done via electrically conductive fastening means 10 that break 4.

That is, the fastening means 10 connects the main girder members 2 of the cable rack 1 to each other in a butt-like manner.
2, or when the ends of the main beam members 2 of the cable rack 1 are connected with each other in an overlapping manner and are screwed together, conductive screw parts are used.

This screwed component breaks the surface treatment film 4 and comes into contact with the fabric, thereby establishing electrical continuity between the fabrics of the electrically conductive main girder member 2. At that time, one main girder member 2 and the other main girder member 2 are electrically connected by intervening screwed parts, and the electrical continuity is established either directly by the screwed parts or by other conductive material interposed as necessary. It is indirectly acted on by a certain 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 joint holes 11 are drilled at each joint site at the end of the main girder member 2 of the cable rack 1, and A substantially horizontally elongated rectangular joint slot 13 that matches the position of the joint hole 11 is drilled in a joint piece 12 that is placed on the side surface of the main beam members 2 in which the end surfaces of the main beam members 2 are in a butt shape.

On the other hand, the base of the threaded part of the joint bolt 14 which is inserted into the joint hole 11 and the joint elongated hole 13 in a matching manner is such that although it is inserted into the joint long hole 13, it comes into contact with the inner edge of the joint bolt and does not rotate idly. The root portion 15 has a substantially rectangular cross section with a diagonal line longer than the inner diameter. As shown in the figure, a nut 16 with a washer is screwed into the joint port 14 itself to fasten the main girder member 2 and the joint fitting 12.

Note that the surface of the joint 12 is also subjected to a surface treatment 114 in the same manner as the cable rack 1, and a breaking protrusion 25 is formed on the back surface of the nut 16 in order to break it. As shown in FIG. 15, this breaking protrusion 25 is formed by continuously forming small sawtooth protrusions along the outer edge of the nut, each having an end surface that is substantially perpendicular in the screwing direction. Although not shown, the breaking protrusion 25 may be formed by knurling, and the point is that the surface treatment film 4 may be broken as the screw is screwed in to contact the surface of the fabric.

According to this embodiment, when the nut 16 is screwed into the joint bolt 14 inserted through the joint hole 11 and the joint elongated hole 13, the root portion 15, which is larger than the inner diameter of the joint hole 11, bites into the joint hole 11. (See FIG. 2), the surface treatment film 4 applied to the inner edge of the joint hole 11 and the surface of the joint fitting 12 is broken (see FIG. 5), and electrical continuity is obtained. That is,
An electrical route is formed for one cable rack 1, one joint bolt 14, one nut 16, the other joint bolt 14, and the other cable rack 1.

In this embodiment, the root portion 1.degree. 5 of the connecting bolt 14 does not have a substantially rectangular cross section as shown in the drawings, but may have a triangular, pentagonal or more polygonal shape, etc., as desired.

<Embodiment 2> In FIG. 3, the circumferential surface of the root portion 15 of the joint bolt 14 is knurled 17, which is, for example, directly in the form of a vertical groove as shown in the figure. The other structure is the same as in Example 1.

<Embodiment 3> In FIG. 4, a bolt 14 is similar to Embodiment 1, except that a vertical groove 18 having a substantially serrated cross section is formed on the circumferential surface of the root 15 of the joint bolt 14. . This vertical groove 1
8 may be a straight line along the length direction of the joint bolt 14 or a curved line.

According to Examples 2 and 3, surface treatment 1 of the inner edge of the joint hole 11
T! Furthermore, according to the curved vertical groove 18 of the third embodiment, when the joint bolt 14 is slightly rotated when screwed into the nut 16, , the surface treatment film 4 is further broken.

<Example 4> In FIG. 5, although it is the same as each example mentioned above,
However, the root portion 15 of the joint bolt 14 has a tapered surface that gradually becomes larger in diameter as the tip of the threaded portion reaches the head. According to this, when screwing into the nut 16, the root portion 15 quickly and smoothly enters the joint hole 11 and the joint elongated hole 13, making it easy to break the surface treatment film 4 on the inner edges thereof.

<Example 5>.

In FIG. 6, unlike Examples 1 to 4,
The joint hole 11 shape is polygonal and gear-shaped, and the joint bolt 1
The cross-sectional shape of the root portion 15 of No. 4 is circular, and the other parts are the same. According to this, the surface treatment l14 is broken at a portion of the inner edge of the joint hole 11 that contacts the root portion 15 of the joint bolt 14, and as a result, electrical continuity between the cable racks 1 is obtained.

<Embodiment 6> In FIGS. 7 and 8, the joint bolt 14 inserted through one cable rack 1 and the other cable rack 1
A conductive member, for example, a copper plate 19 (see FIG. 7),
A bond wire 20 (see FIG. 8) is installed. This conductive member connects one cable rack 1, one joint bolt 14, one nut 16, and the conductive member (copper plate 19).
An electrical route is formed for the bond wire 20), the other nut 16, the other joint bolt 14, and the other cable rack 1. In this way, even more reliable electrical continuity between the screwed parts can be obtained by the conductive members (copper plate 19, bond wire 20).

<Example 1> In FIG. 9, a U-shaped joint bolt 14 that spans over the cable racks 1 to be connected is prepared, and a breaking ridge 21 for breaking the surface treatment film 4 is provided at the base of the threaded part. It is a remarkable thing. As shown in the illustrated example, the broken protrusion 21 is formed inside the bent portion in a substantially triangular shape with sharp edges.

According to this, when the threaded portions of the connecting bolts 14 are inserted through the connected cable racks 1 so as to straddle each other, and the nuts 16 are screwed into the threaded portions, the connecting bolts 14 are pulled together by the nuts 16. , the broken ridge 21 breaks the surface treatment pa4 on the inner edge of the joint hole 11.

<Embodiment 8> In FIG. 10, a pair of connecting bolts 14 that are inserted through each of the cable racks 1 to be connected are coupled and integrated with the connecting board 22 that straddles the cable racks 1. A sharp breaking protrusion 23 is formed to break the surface treatment l1I4.

Similar to the seventh embodiment, the connecting board 22 is arranged so as to straddle the cable racks 1 to be connected, and the connecting bolts 14 are inserted through each of the cable racks 1 to tighten the nuts 16. It is only necessary to screw it in, and as the joint bolt 14 is screwed in, it is pulled, and the breaking protrusion 23 bites into the surface of the cable rack 1 and breaks the surface treatment film 4 on the surface of the cable rack 1.

<Example 9> In FIGS. 11 and 12, the ends of the main girder members 2 of the cable rack 1 are overlapped with each other, and conductive joint bolts are inserted through the overlapped main girder members 2. At 14, the surface treatment [14] of one cable rack 1 is broken, and at the nut 16 screwed into the joint bolt 14, the surface treatment film 4 of the other cable rack 1 is broken.

Specifically, a step is formed at one end of the left and right main girder members 2 of the cable rack 1 that are connected to each other, with the end portion bent inwardly or outwardly to have a step corresponding to the wall thickness. A connecting portion 24 is formed, and this stepped connecting portion 2
4, overlap the other end portion that remains straight and secure with screws. When screwing, the joint bolt 14 is inserted into the joint hole 11 which is opened by aligning the position with the step connection part 24 and the end portion, and the surface treatment film 4 on the inner edge of the joint hole 11 is inserted.
While breaking the joint bolt 14, the nut 16 is screwed into the joint bolt 14. The back surface of the nut 16 that comes into pressure contact with the surface of the main girder member 2 as it is screwed into the joint bolt 14 is coated with surface treatment I.
I! A breaking protrusion 25 is formed to break J4. This breaking protrusion 25 may be formed like a book (front) or may be formed like a nut 1.
6. A ring-shaped protrusion is formed along the periphery (Fig. 11,
(see Fig. 12), or an uneven surface (see Fig. 13, 14).
(see figure).

According to this, it is possible to omit the joints 12 that are spanned between the cable racks 1 as in the first to eighth embodiments, simplifying the joint structure and shortening the working time.

And also, one cable rack 1, joint bolt 14
, nut 16, and the other cable rack 1, fewer conductive parts are involved, further improving the reliability of electrical continuity.

In addition, it is possible to apply the screw fastening parts of the above-mentioned embodiments 7 and 8 to this embodiment 9.

[Effects of the Invention] As described above, the present invention can connect cable racks to each other and simultaneously achieve electrical continuity between them, and unlike the conventional methods,
There is no need to perform electrical connection work separately from the work of joining cable racks together, 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 a state of use in J3, and Fig. 2 is an exploded perspective view showing the breakage of the surface treatment film at the joint hole site. front view,
Figures 3 and 4 are perspective views of joint bolts in Example 2 and Example 3, respectively, Figure 5 is a cross-sectional view of Example 4 in use, and Figure 6 is an exploded view of the main parts in Example 5. The perspective view, FIGS. 7 and 8 are exploded perspective views of the sixth embodiment in use, FIG. 9 is a perspective view of the seventh embodiment when the connecting bolts are connected, and FIG. 10 is the same. FIG. 11 is an exploded perspective view of Embodiment 9, FIG. 12 is a sectional view of its usage state, and FIG. 13 is the same. The figure is a sectional view of the nut in use, and FIG. 15 is a side view of the nut. 1... Cable rack, 2... Main girder member, 3...
Sub-girder member, 4... Surface treatment membrane, 10... Fastening means, 11... Joint hole, 12... Joint fitting, 13... Joint elongated hole, 14... Joint bolt,
15... Root, 16... Knot, 17... Knurling, 18... Vertical groove, 19... Copper plate, 20...
... Bond wire, 21 ... Broken ridge, 22 ... Interlocking board, 23 ... Breaking protrusion, 24 ... Step connection part, 25 ...
...Fracture protrusion. Procedure m positive 1! ! M (voluntary) May 27, 1986

Claims (1)

[Claims] 1. When connecting cable racks coated with non-conductive surface treatment films, conductive fastening means that breaks the surface treatment film are used to connect the cable racks to each other in a conductive state. A method for joining cable racks. 2. The ends of the main girder members of the cable rack are butted against each other, and conductive fittings are installed on the sides of the main girder members,
2. The cable rack joining method according to claim 1, wherein the surface treatment film is ruptured by a conductive joining bolt inserted through the parent girder member and the joining fittings. 3. The ends of the main girder members of the cable rack are overlapped with each other, and the surface treatment film of one cable rack is ruptured using conductive joint bolts inserted through the overlapped main girder members. 2. The cable rack joining method according to claim 1, wherein the surface treatment film of the other cable rack is broken by a nut screwed into the other cable rack. 4. A fastening means is provided between the connecting parts of the cable racks coated with a non-conductive surface treatment film, and this fastening means is provided between the surface treatment film of one cable rack and the surface treatment film of the other cable rack. A cable rack fitting, characterized by having a conductive screw fastening part that breaks the surface treatment film. 5. The fastening means is a conductive joint that connects the ends of the main girder members of the cable rack in a butted manner, and is inserted into the joint and the main girder member in a matching manner, and breaks the surface treatment film of the penetrated part. 5. The cable rack joint according to claim 4, comprising a conductive joint bolt and a conductive nut screwed into the joint bolt. 6. The fastening means includes a conductive joint bolt that is inserted between the ends of the main girder members of the stacked cable racks and breaks the surface treatment film of one of the main girder members in the penetrating portion, and this joint. 5. The cable rack joint according to claim 4, comprising a conductive nut that is screwed into the bolt and breaks the surface treatment film of the other main girder member that comes into pressure contact with the bolt as it is screwed. 7. The cable rack fitting according to claim 5 or 6, wherein the nut has a breaking protrusion formed on its back surface to break the surface treatment film.