JPS5943781Y2 - Cable rack connection - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a connection part of a cable rack.

In general, a cable rack has a ladder-like configuration with opposing parallel side frames and a bottom space connecting the two side frames.

The material is generally metal such as aluminum or iron.

Since the length of one unit of cable rack is determined,
When installing this on a cable route, the cable racks must be connected to each other.

In the conventional cable rack connection section, the ends of the side frames of the cable racks to be connected are butted against each other, and connecting plates are abutted against the side walls so as to span the side walls of both ends, and bolts are tightened. .

In this case, it is necessary to establish electrical continuity between the connected cable racks in order to ground them, but the surfaces of the cable rack buttons and connection plates at the connection parts should be painted or surface-treated to prevent rust. has been done.

For this reason, conduction cannot be achieved with the connecting plate alone, so one end of the bond wire is sandwiched between the bolt head of the bolt passing through one side frame and the connecting plate, and the other end of the bond wire is connected to the bolt head passing through the other side frame. By sandwiching the bolt between the bolt head and the connecting plate, electrical continuity was established between the bolts passing through both side frames of the connection part.

Electrical continuity between the bolt and the side frame is achieved by interposing a toothed washer between the nut screwed onto the bolt and the side frame, and the tightening force of the nut causes the teeth of the toothed washer to connect to the side frame. It was obtained by embedding it.

In this way, electrical continuity between the connecting parts was obtained through a path starting from one side frame: toothed washer, nut, Bordeaux bond wire, bolt, nut, toothed washer, and the other side frame.

However, such a connection has the drawback that attachment of the bond 1g is troublesome and requires a lot of effort.

For this reason, a toothed washer is also used for the bolt head of the bolt, and the toothed washer is interposed between the bolt head and the connecting plate, and instead of a bond wire, a series of Bordeaux toothed washers connect the plate to the toothed washer to the bolt path. A method of obtaining electrical continuity is also used.

However, the use of toothed washers has the drawback of increasing the number of parts and increasing costs.

The purpose of this invention is to provide a cable rack connection part that eliminates the above-mentioned drawbacks, and for this reason, the present invention has been developed to reduce the pressing force of the bolt head when tightening the bolt nut to the bolt head receiving part of the connecting plate used in the connection part. It is characterized by the formation of protrusions that can be crushed.

An embodiment of this invention will be explained based on the drawings of FIGS. 1 to 4.

1 is a cable rack, with parallel side frames 1a facing each other;
It has a ladder-like structure with a base area 1b' connecting the frames on both sides.

2 is a connecting plate, and cable racks 1 are butted against each other.
It is brought into contact with the side wall of the end side frame 1a so as to span both ends thereof, and is tightened with bolts 3 and nuts 4.

A toothed washer 5 is interposed inside the nut 4.

As shown in FIG. 2, the connecting plate 2 has a protrusion 2a that is perpendicular to the longitudinal direction of the cable rough.

The protruding strip 2a has a height of about 31 to 2 mm, for example, so that it can be crushed by the pressing force of the bolt head when the bolt 3 and nut 4 are tightened.

The number of protrusions 2a is two per bolt.

This connecting plate is manufactured by cutting a molded material having a cross-sectional shape as shown in FIG. 3 at right angles to the protruding stripes.

According to the above embodiment, the protruding strips of the connecting plate are crushed by the pressing force of the bolt head when tightening the bolt nut, so the insulating coating on the surface is destroyed, and there is no electric current between the bolt and the connecting plate.
Air conduction is achieved.

Therefore, as shown in FIG.
From a, toothed washer 5 - nut 4 - bolt 3 series connection plate 2
Electrical continuity is achieved through the route of - bolt 3 - nut 4 - toothed washer 5 - the other side frame 1a.

As described above, according to this embodiment, since the protruding strip is provided on the connecting plate of the connecting part, electrical continuity is achieved between the bolt and the connecting plate.Therefore, it is necessary to interpose a toothed washer between the bolt and the connecting plate. disappears.

Therefore, the number of work hours is reduced, and at the same time, costs can be reduced by the amount of the toothed washer.

The number of protrusions on the connecting plate in the above example is 2 per bolt.
Although the number of articles is not limited to two, it may be one article or a plurality of articles of two or more articles.

Further, although the protruding stripes of the connecting plate in the above embodiment are perpendicular to the longitudinal direction of the cable rack, the protruding stripes are not limited to being perpendicular to the longitudinal direction of the cable rack. It is manufactured by cutting a material having a cross-sectional shape as shown in Fig. 6 at right angles to the protruding stripes.

Furthermore, as shown in FIGS. 7 and 8, the connecting plate has two bolt head locking ridges 2b that are wider than the dimension between opposite sides of the bolt head and narrower than the dimension between diagonal parts at the bolt head receiving part. It is also possible to provide protruding stripes 2a between the ridges 2b.

Such a connecting plate is manufactured by cutting a material having a cross-sectional shape as shown in FIG.

When using this connecting plate, when tightening a bolt/nut, all you have to do is tighten the nut, and there is no need to stop the bolt head from turning.

As explained above, according to the present invention, a protruding strip is provided on the connecting plate of the connection part, so that by crushing this protruding strip with the bolt head, electrical continuity is achieved between the bolt and the connecting plate, and between the bolt and the connecting plate. This eliminates the need for intervening toothed washers.

Therefore, the number of work hours is reduced, and at the same time, costs can be reduced by the amount of the toothed washer.

! Since the connecting plate used in the present invention is manufactured by cutting a shaped material provided with protruding stripes, the connecting plate with protruding stripes can be obtained extremely easily.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the cable rack connection part of the present invention. Fig. 2 is a perspective view of a connecting plate used in the cable rack connecting part of the above embodiment, Fig. 3 is a sectional view taken along line A-A of the connecting plate, and Fig. 4 is a connecting part using the same connecting plate. FIG. 5 is a perspective view showing another example of the connecting plate used in the cable rack connection part of the present invention, and FIG. 6 is a B-B of the connecting plate.
FIG. 7 is an enlarged side view of the main part showing still another example of the connecting plate used in the cable rack connection part of the present invention, and FIG. 8 is a sectional view taken along the line C-c of the same connecting plate. . 1...Cable rack, 1a...Cable rack standard frame, 2...Connection plate, 2a...Protrusion strip, 2b... - Bolt head rotation stopper.

Claims (1)

[Scope of Claim for Utility Model Registration] - Abut the ends of the side frames of the cable racks to be connected, abut the connecting plates so as to span the side walls of both ends, and fasten them together with bolts and nuts. The cable rack connecting portion is characterized in that the connecting plate is made of a shaped material, and the bolt head receiving portion is formed with a protrusion that is crushed by the pressing force of the bolt head. Connection part. 2. Utility Model Registration A cable rack connection part according to claim 1, characterized in that the protruding strip of the connection plate is formed between bolt head rotation prevention ridges.