JPH0328127B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a prefabricated cable rack, and is a ladder-shaped cable rack used for bundling and laying various cables. At the same time, it has been improved so that it can be assembled easily, and at the same time, it can ensure electrical continuity between the base girder members and the child girder members, which are coated with a special surface treatment film for weather resistance, rust prevention, etc. This invention relates to a prefabricated cable rack.

[Technical background of the invention and its problems]

Various types and structures of this type of cable rack have been proposed in the past, and most of them are
In order to cope with changes in the environment at the installation site, all of them have undergone special surface treatments that take into account weather resistance, rust resistance, salt resistance, moisture resistance, chemical resistance, etc.
For example, it is a melamine baked coating, a Pawcoat finish (epoxy resin coating) with excellent rust prevention, and a hot-dip galvanized finish. However, these special surface treatment films do not have conductivity, especially in ladder-shaped ones, because there is no conductivity between the parent girder member and the child girder member that are assembled and connected. This was extremely inconvenient as it was impossible to avoid leakage current.

In addition, as a device for connection and electrical continuity of the cable rack itself, for example,
There were mechanisms shown in Publication No. 142697 and Japanese Utility Model Application Publication No. 58-53374. However, all of these mechanisms use only the tip of the grounding screw to remove painted surfaces and organic coatings, so
For example, if the grounding screw is not screwed in properly,
The tip of the screw could not sufficiently peel off the painted surface or organic coating, making it impossible to establish electrical continuity with the cable rack.

[Purpose of the invention]

Therefore, the present invention has been created in view of the existing points as described above, and when assembling and connecting the parent girder member and the child girder member, each of which has been provided with a surface treatment film, the surface treatment film is removed. The purpose is to ensure electrical conduction between the two by breaking and connecting them, thereby solving the conventional inconveniences.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention includes a parent girder member disposed facing each other, a child girder member having assembly connecting pieces each having a through hole drilled in the upright portion fixed to both ends. It consists of a coupling screw that destroys both the surface treatment film on the parent spar member and the surface treatment film on the child spar member at the assembly and connection site, and assembles and connects both the parent spar member and the child spar member in a conductive state. The head and screw parts are integrally formed from a conductive material, and the hole is drilled into the upright part of the assembly joint piece which is inserted into the main spar member from the outside of the main spar member and fixed to both ends of the child spar member. In addition to being forcibly screwed into the through hole, the diameter of the threaded portion is slightly larger than the inner diameter of the through hole so that the screw can be screwed in while destroying the surface treatment film in the through hole. It was decided to provide a film-destroying uneven surface that destroys the surface treatment film on the main girder member.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

The reference numeral 1 shown in the figure is a pair of master spar members arranged to face each other in the left and right directions, and the reference numeral 5 is a child spar member that is spanned between the master spar members 1. The main girder member 1 in the illustrated example has a groove-shaped reinforcing part 2 that is open on the inside at the top, and a groove-shaped slave girder fitting part 3 that is also open on the inside at the bottom. In some cases, as shown in FIG. 5, the upper part of the sub-girder fitting part 3 may be inclined, or the lower part may be curved and bulged downward. The sub-girder member 5 has a groove-shaped cross section with a lip along the opening edge in order to reinforce itself and to secure the cable W to be laid and wired, and has an L-shaped cross-section at both ends. An assembly coupling piece 6 is fixedly attached to the interior by welding or the like, and a through hole 7 is bored in the upright portion of the assembly coupling piece 6. The parent spar member 1 is coated with a surface treatment film 4, and the child spar member 5 is coated with a surface treatment film 8 on both surfaces of the main spar member 1 and the child spar member 5 in order to achieve rust prevention, weather resistance, etc. is applied, and these surface treatment films 4, 8
Same as before, it has melamine baked paint, paw coat finish (epoxy resin paint), and hot dip galvanized finish.

Such a parent spar member 1 and a child spar member 5 are assembled and connected in a ladder shape by crossing the parent spar members 1 facing each other with the child spar members 5 arranged in parallel at appropriate intervals. Specifically, both ends of the child spar member 5 are fitted into the child spar fitting portion 3 of the parent spar member 1, and the child spar member 1 is penetrated from outside at the child spar fitting portion 3 portion. This is done by screwing the inserted connecting screw 9 into the through hole 7 of the assembled connecting piece 6.

At that time, the coupling screws 9 destroy the surface treatment film 4 of the parent spar member 1 and the surface treatment film 8 of the child spar member 5, so as to achieve mutual conductivity between the bases of the parent spar member 1 and the child spar member 5. Therefore, the coupling screw 9 itself has a head 10 and a threaded part 12 integrally formed of a conductive material, and the diameter of the threaded part 12 is slightly larger than the inner diameter of the through-hole 7. The screw can be forcibly screwed in while destroying the surface treatment film 8 in 7, and a film-destroying uneven surface 11 that destroys the surface treatment film 4 in the parent girder member 1 is provided on the side surface of the screw portion 12 of the head 10. It consists of

As shown in FIGS. 3 and 4, the membrane-destroying uneven surface 11 provided on the head 10
They are arranged in, for example, a ring shape on the inside along the outer periphery of the spar, and have unevenness along the arrangement direction, and the head 10 is placed in a state where the side surface of the head 10 is in contact with the outer surface of the main beam member 1. When rotated, the surface treatment film 4 is destroyed. Further, the tip of the threaded portion 12 has a conical shape that gradually becomes smaller in diameter as it reaches the tip, and a through hole 7 with a small diameter is formed in the diameter of the threaded portion 12.
It is designed so that it can be guided and inserted smoothly. The threaded part 12 itself is screwed into the inner peripheral surface of the through hole 7 while forming a female thread, using a so-called tapping method. have.

In this way, the coupling screw 9 is inserted from the outside of the main spar member 1 into the main spar member 1 and its child spar fitting part 3,
By forcibly screwing into the through hole 7 opened in the upright part of the assembly connecting piece 6 fixed to both ends of the child beam member 5, the threaded part 1
2 covers the surface treatment film 8 of the sub-spar member 5, and the head 1
The film-destroying uneven surfaces 11 of 0 destroy the surface treatment films 4 of the parent girder member 1, respectively, and realize a mutual conductive state between the substrates of the parent girder member 1 and the child girder member 5.

Next, the main girder member 1 configured in this way,
To explain an assembly example using the child spar member 5 and the coupling screws 9, the child spar member 5 is placed across the rack with an appropriate interval between the main spar members 1 facing each other on the left and right, and the assembly is carried out in such a manner that the child spar member 5 is placed across the rack. At the joining site, as shown in FIG. 1, the joining screws 9 may be inserted into the main spar member 1 from outside the main spar member 1 and screwed into the child spar member 5.

〔Effect of the invention〕

As described above, in the present invention, the surface treatment film 4 on the parent spar member 1 and the surface treatment film 8 on the child spar member 5 are connected by the coupling screws 9 at the assembly connection site of the parent spar member 1 and the child spar member 5. Since both of them are made to be destroyed, both the parent girder member 1 and the child girder member 5 can be brought into a conductive state between their bases by the connecting screws 9, and the conductive state is only caused by the connecting screws 9. By screwing, both the parent girder member 1 and the child girder member 5 can be assembled simultaneously.

That is, this means that the coupling screw 9 is connected to the main beam member 1.
This is because both the surface treatment film 4 and the surface treatment film 8 on the child spar member 5 are destroyed at the assembly and connection site, and both the parent spar member 1 and the child spar member 5 are assembled and connected in a conductive state. Moreover, even if the respective surface treatment films 4 and 8 are destroyed, since they are covered by the coupling screws 9, there is no major effect on weather resistance, rust prevention, etc.

In addition, the coupling screw 9 has a head 1 made of a conductive material.
0. A through hole formed integrally with the threaded portion 12 and drilled in the upright portion of the assembly coupling piece 6 which is inserted into the parent spar member 1 from the outside of the parent spar member 1 and fixed to both ends of the child spar member 5. 7, and the diameter of the threaded portion 12 is made slightly larger than the inner diameter of the through hole 7 so that the surface treatment film 8 in the through hole 7 can be screwed in while destroying it. Since the film-destroying uneven surface 11 that destroys the surface treatment film 4 of the main spar member 1 is provided on the side surface of the main spar member 1, it is possible to reliably assemble and connect both the main spar member 1 and the child spar member 5 in a conductive state. can.

In other words, the coupling screw 9 has a head 10 and a threaded portion 12 integrally formed of a conductive material, and is fixed to both ends of the sub-spar member 5 while destroying the surface treatment film 8 in the through hole 7 of the assembly coupling piece 6. At the same time as screwing in, head 1
Since a film-destroying uneven surface 11 that destroys the surface treatment film 4 on the parent girder member 1 is provided on the side surface of the screw portion 12 of the screw 0, the head 10 of the coupling screw 9 and the screw portion 1
2 destroys the surface treatment films 4 and 8, thereby ensuring mutual electrical conductivity between the substrates of the parent girder member 1 and child girder member 5.

Further, the coupling screw 9 itself is compatible with other screws, and it is easy to remove and reassemble the screw 9, and the work can be easily carried out using a normal hexagonal spanner, wrench, etc.

As explained above, according to the present invention, it is possible to ensure the electrical connection between the parent girder member and the child girder member, and the conductivity between the substrates, and it is possible to solve the problems that existed in the past. Furthermore, it is not only easy to reassemble, but also has excellent effects such as reducing packaging costs during transportation.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a partially cutaway exploded perspective view of the main part, Fig. 2 is a sectional view of the main part when assembled and connected, and Fig. 3 is a partially cutaway front view of the coupling screw. FIG. 4 is a side view of the same, and FIG. 5 is a sectional view of another embodiment at the time of assembly and connection. 1... Main spar member, 2... Reinforcement part, 3... Child spar fitting part,
4...Surface treatment membrane, 5...Scarlet member, 6...Assembly coupling piece, 7...Through hole, 8...Surface treatment membrane, 9...Coupling screw,
10...Head, 11...Membrane destruction uneven surface, 2...Screw part,
W...Cable.

Claims (1)

[Claims] 1. A parent girder member disposed facing each other, a child girder member having assembled joint pieces with a through hole drilled in the upright portion fixed to both ends, a surface treatment film on the parent girder member, and a surface treatment on the child girder member. It consists of a coupling screw that destroys both the membranes at the assembly and coupling site and assembles and couples both the parent girder member and the child girder member in a conductive state, and the coupling screw has a head and a screw portion integrally formed from a conductive material. The screws shall be forcibly screwed into the through holes drilled in the upright parts of the assembled joint pieces that are inserted into the parent spar member from the outside and fixed to both ends of the child spar members. The diameter of the part is slightly larger than the inner diameter of the through hole to enable screwing while destroying the surface treatment film in the through hole, and the side surface next to the threaded part of the head has film breaking unevenness that destroys the surface treatment film in the parent girder member. An assembly type cable rack characterized by having a surface.