JP2003333722A - Cable rack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cable rack which can be set up favorably without needing much time and labor. <P>SOLUTION: This cable rack is equipped with a pair of master beams which have specified width and length and are counterposed and slave beams 2 which have specified width and length and are laid orthogonal to the master beams between the paired master beams. Herein, the above master beams and the slave beams 2 are coupled with each other by pressing their mutually abutting sections from the specified direction thereby making a concave and convex joint 6. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable rack used for crawling cables in a building.

[0002]

2. Description of the Related Art In this type of cable rack, a pair of parent girders are arranged at intervals, and a plurality of child girders are arranged between the pair of parent girders so as to be orthogonal to the parent girder. Both ends in the longitudinal direction are fixed by welding or screwing.

By the way, although there is a surface-treated cable rack of this kind, it is not possible to connect the parent girder and the child girder by spot welding in the manufacturing and assembling so as not to impair the surface treatment. It is possible and is currently fixed by screwing.

FIGS. 7 and 8 show the case of fixing by screwing, in which the inner surface of the main girder 1 and the end surface of the child girder 2 in the longitudinal direction are brought into contact with each other, and the screw member 3 is attached to the child girder 2 from the outer surface of the parent girder 1. Are fixed by screwing (for example, refer to Patent Document 1).

[0005]

[Patent Document 1] Japanese Patent Publication No. 3-28127

[0006]

However, the fastening by the screw member 3 as described above has a problem that it takes a lot of time and effort although the required strength is secured. Further, it is necessary to take measures so as not to impair the surface treatment of the screw member 3 and the screw holes 4 and 5.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a cable rack which can be satisfactorily assembled without any trouble and is easy to use.

[0008]

A cable rack according to a first aspect of the present invention for solving the above-mentioned problems has a pair of main girders 1 having a predetermined width and a length and facing each other. A pair of parent girders 1 having a width and a length and a child girder 2 which is erected so as to be orthogonal to the parent girder 1, and in which the parent girder 1 and the child girder 2 are in contact with each other, It is characterized in that they are connected by being pressed from a predetermined direction to form the concave-convex fitting portion 6. Since the concavo-convex fitting portion 6 is formed and connected by plastic working, the cable rack can be simply assembled without impairing the surface treatment unlike conventional welding.

A cable rack according to a second aspect of the present invention is the cable rack according to the first aspect, wherein the parent girder 1 has a bent piece 1a at an end portion in the width direction, and a bent piece of the child girder 2 and the parent girder 1. 1a
The concavo-convex fitting portion 6 is provided at the contact portion with. It is possible to connect the child girders 2 with respect to the parent girders 1 with excellent tensile strength (strength in the separating direction).

A cable rack according to a third aspect of the present invention is the cable rack according to the first or second aspect, wherein a plurality of the concave-convex fitting portions 6 are provided in the same plane. It is possible to perform a connection with excellent strength against a rotational force with the uneven fitting portion 6 as a fulcrum.

A cable rack according to a fourth aspect of the present invention is characterized in that, in any one of the first to third aspects, the concavo-convex fitting portion 6 is formed so that a protruding tip portion thereof can be expanded. And The concavo-convex fitting portion 6 can be connected so as to improve the retaining strength.

The cable rack according to a fifth aspect of the present invention is the cable rack according to any one of the first to fourth aspects, wherein the concave-convex fitting portion 6 is provided so as to project inward of the sub beam 2. And It is possible to prevent the concave-convex fitting portion 6 from projecting to the outer surface side, and it is possible to reduce inconveniences during cable rack construction and cable laying.

A cable rack according to a sixth aspect of the present invention is the cable rack according to any one of the first to fifth aspects, wherein the sub-beam 2 has a pair of facing pieces 2a and a facing piece 2 facing each other in the width direction.
It is composed of a connecting piece 2b for connecting a and a mounting piece 7 attached to the parent girder 1 provided at both ends in the longitudinal direction of the connecting piece 2b, and the mounting piece 7 has a notch 8 communicating with the inner side of the child spar 2.
Is provided. When the screw member for attaching the earth bond wire is attached to the parent girder 1, by inserting the tip end of the screw member into the sub-girder 2 through the cutout portion 8, even if there is the attachment piece 7, the tip end of the screw member is present. Can be installed so as to be hidden inward of the spar girder 2, and the inconvenience of the tip of the screw member protruding inward from the inner surface of the parent spar 1 can be prevented.

A cable rack according to a seventh aspect of the present invention is the cable rack according to any one of the first to sixth aspects, wherein the child girder 2 has mounting pieces 7 for attaching to the parent girder 1 at both ends in the longitudinal direction. The mounting piece 7 is characterized in that a pair of ribs 9 are provided at both ends in the width direction. The strength of the mounting piece 7 is improved, and the assembly by pressing can be favorably performed.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 2, a cable rack is constructed such that a plurality of child girders 2 are erected at equal intervals between a pair of parent girders 1 arranged on both sides with a space therebetween, and both ends of each child girder 2 are arranged. Is connected to the main beam 1, and the cable is supported by extending the cable over the secondary beam 2 so as to be parallel to the main beam 1. The parent girder 1 and the child girder 2 of such a cable rack are made of metal, and the surface thereof is subjected to surface treatment such as painting and plating. The main girder 1 has a predetermined width and length, and has a cross section of a bent piece 1a provided at both ends in the width direction over the longitudinal direction and an intermediate piece 1b connecting the bent pieces 1a at both ends in the width direction. It is formed in a substantially U shape. On both ends in the width direction of the intermediate piece 1b, concave groove portions 10 are provided so as to extend in the longitudinal direction. The sub-beam 2 also has a predetermined width and length, and has a substantially cross-section lip formed by a facing piece 2a provided at both ends in the width direction over the longitudinal direction and a connecting piece 2b connecting the facing pieces 2a at both ends in the width direction. It is formed in a U-shape. At both ends of the child beam 2 in the longitudinal direction, mounting pieces 7 that are integrally connected to the connecting piece 2b and are orthogonal to the connecting piece 2b are provided. A pair of ribs 9 are provided at both ends in the width direction of the mounting piece 7 with a predetermined space L therebetween, and the rib 9 reinforces the mounting piece 7. The rib 9 is provided so as to extend not only to the mounting piece 7 but also to the end of the connecting piece 2b. Further, notches 8 are provided between both ends of the mounting piece 7 in the width direction and the facing piece 2a.

When the slave girder 2 is connected to the master girder 1, the end face in the longitudinal direction of the slave girder 2 is opposed to the inner surface of the master girder 1, and the longitudinal end of the slave girder 2 is the concave groove portion 10 of the master girder 1. When the mounting piece 7 is inserted into the inner side of the parent girder 1 and the mounting piece 7 is brought into contact with the inner surface of the concave groove portion 10 of the parent girder 1, the longitudinal end of the connecting piece 2b of the child girder 2 is attached to the parent girder 1.
The bent pieces 1a are brought into contact with each other, and the contact portions are joined together by the concave-convex fitting portion 6 formed by pressing. In the case of this example, the abutting portions of the attachment piece 7 and the intermediate piece 1b of the parent girder 1 are joined by one concave and convex fitting portion 6a, and the longitudinal end portion of the connecting piece 2b of the child girder 2 and the parent girder 1 are joined. The contact portion with the bent piece 1a is connected by the two concave and convex fitting portions 6b. The concavo-convex fitting portion 6 is joined by pressing from the side of the main girder 1 and fitting the concave portion 11 on the side of the main girder 1 into the concave portion 12 on the side of the small girder 2 as shown in FIG.
A projecting portion 11a that spreads outward is formed on the outer circumference of the tip of the recess 11, and a recess 12a that spreads outward is formed on the inner circumference of the tip of the recess 12 so that the projection 11a and the recess 12a are in close contact with each other. The concave and convex fitting portions 6 are securely coupled so as not to come off.

The concavo-convex fitting portion 6 is coupled by the double clinch method as shown in FIG. 5 or the single clinch method as shown in FIG. The double clinch method shown in FIG. 5 is performed as follows. A pair of metal plates C and D are arranged between the punch A and the die B, and the die A on the lower surface of the metal plates C and D is pressed by the punch A from the upper surface as shown in FIG. 5A. , The metal plates C and D are plastically deformed. Next, as shown in FIG. 5B, the anvil E is lifted from the lower surface, the portion plastically deformed by the punch convex portion F is crushed, and the two metal plates C and D are locked to complete the fastening. The single clinch method shown in FIG. 6 is performed as follows. Unlike the double clinch described above, the punch A plastically deforms by pressing from the upper surface of the metal plates C and D as shown in FIG. 6 (a), and at the same time, the die B on the lower surface is deformed as shown in FIG. 6 (b). It escapes laterally and the lower surface is plastically deformed at the same time as the upper surface is deformed.

The cable rack is assembled as described above, but since the parent girder 1 and the child girder 2 are connected by the concave and convex fitting portion 6 by pressing, the surface treatment is not impaired, and the cable rack can be assembled simply. You can At this time, in order to connect the contact portion between the intermediate piece 1b of the main girder 1 and the mounting piece 7 of the small girder 2 with the concave-convex fitting portion 6, the shear strength of the small girder 2 with respect to the middle of the main girder 1 (positional shift direction) The strength of the cable rack is excellent, and it is effective for securing the strength when the cable rack is handled while holding the spar 2 for example. In FIG. 1, a and c are directions in which a shearing force is applied, and b is a direction in which a tensile force is applied. Further, in order to connect the abutting portions of the bent piece 1a of the parent girder 1 and the connecting piece 2b of the child girder 2 with the concave-convex fitting portion 6, the tensile strength of the child girder 2 with respect to the intermediate piece of the parent girder 1 (in the separating direction) (Strength) is excellent, which is effective for securing strength when handling the cable rack with the main girder 1, for example. The connection by these concave-convex fitting parts is inferior in strength to the conventional spot welding and screwing, but if they are connected at both of the above-mentioned two abutting parts, the cable rack can be connected. It is possible to secure the minimum required strength in handling and use. Further, the strength can be further improved by the following configuration. That is, the bent piece 1a of the parent girder 1 and the child girder 2
Since a plurality of concave-convex fitting portions 6 are provided in the same plane at the contact portion with the connecting piece 2b, the strength against the rotational force with the concave-convex fitting portions 6 as a fulcrum becomes excellent. Further, the concave-convex fitting portion 6 is formed by the double clinch method or the single clinch method as described above so that the protruding tip end thereof spreads out, and the retaining strength of the concave-convex fitting portion 6 is improved. In addition, the uneven fitting portion 6
Are formed so as to project inward of the child spar 2, and are not exposed by projecting outward. Therefore, at the time of construction, while the cable rack is slid on the hanger suspended from the ceiling for mounting the cable rack, the concave-convex fitting portion protrudes outside the main girder 1 and becomes caught. Never. Also, when laying the cable inside the main girder 1,
There is no risk that the concave-convex fitting portion will protrude outside the slave girder 2 and damage the cable. In this way, the cable rack can be used satisfactorily without any inconvenience during cable rack construction or cable laying. Further, an earth bond wire may be attached to improve the conductivity of the earth. When the screw member for attaching the earth bond wire is attached to the main girder 1, the tip end of the screw member is inserted through the notch 8 to form a child. By inserting the spar 2 into the spar 2, even if there is the attachment piece 7, the tip of the screw member can be mounted so as to be hidden inside the slave spar 2. Further, by providing the pair of ribs 9 at both ends of the attachment piece of the sub-beam 2, it is possible to improve the support strength of the main beam 1 while ensuring a processing space for the concave-convex fitting portion.

[0019]

According to the first aspect of the present invention, since the concavo-convex fitting portion is formed by plastic working and connected, the cable rack can be simply assembled without impairing the surface treatment unlike the conventional welding. It can be assembled.

Further, the invention according to claim 2 of the present invention enables the child girders to be connected to each other with excellent tensile strength (strength in the separating direction) with respect to the parent girder, and is effective for ensuring the strength when handling the cable rack while holding the parent girder. It is something.

According to the invention of claim 3 of the present invention, the connection having excellent strength against the rotational force with the concave and convex fitting portion as a fulcrum can be performed.

According to the fourth aspect of the present invention, the connection can be made so as to improve the retaining strength of the concave-convex fitting portion, and the strength of the cable rack can be further improved.

Further, the invention of claim 5 of the present invention can prevent the concave-convex fitting portion from projecting to the outer surface side and reduce the inconvenience at the time of constructing the cable rack or laying the cable.

Further, according to the invention of claim 6 of the present invention, even if there is a mounting piece, the tip of the screw member for fixing the earth bond wire can be mounted so as to be hidden inside the slave girder. Therefore, it is possible to prevent the inconvenience of the tip of the projection protruding inward from the inner surface of the parent girder.

According to the invention of claim 7 of the present invention, the strength of the mounting piece is improved and the assembly by pressing can be favorably performed.

[Brief description of drawings]

FIG. 1 shows a main part of an example of an embodiment of the present invention,
(A) is a cross-sectional view seen from the side, (b) is a front view, (c)
FIG. 7A is a sectional view taken along line XX of FIG.

FIG. 2 is a perspective view showing the above cable rack.

3A and 3B show the sub-beams of the above, wherein FIG. 3A is a front view and FIG. 3B is a side view.

FIG. 4 is a cross-sectional view enlarging an uneven fitting portion of the above.

5 (a) and 5 (b) are cross-sectional views for explaining processing by the double clinch method.

6 (a) and 6 (b) are cross-sectional views illustrating processing by a single clinch method.

FIG. 7 is an exploded perspective view showing a conventional example.

FIG. 8 is a cross-sectional view of a connected state of a conventional example.

[Explanation of symbols]

1 parent digit 1a bent piece 2 child digits 2a facing piece 6 Concavo-convex fitting part 7 mounting pieces 8 notches 9 ribs

Continued front page    (72) Inventor Masafumi Tanaka             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company F-term (reference) 5G357 BA00 BA04 BB01 BC05

Claims (7)

[Claims] 1. A pair of main girders having a predetermined width and a length and arranged to face each other, and a pair of main girders having a predetermined width and a length being installed so as to be orthogonal to the main girder. A cable rack provided with a child girder, wherein the parent girder and the child girder are connected by pressing the portions in contact with each other from a predetermined direction to form an uneven fitting portion. 2. The parent girder has a bent piece at an end in the width direction, and the concave-convex fitting portion is provided at a contact portion between the child girder and the bent piece of the parent girder. The cable rack according to claim 1. 3. The cable rack according to claim 1, wherein a plurality of the concave-convex fitting portions are provided in the same plane. 4. The concave-convex fitting portion is formed such that a protruding tip end portion thereof is expanded.
The cable rack according to claim 3. 5. The cable rack according to claim 1, wherein the concave-convex fitting portion is provided so as to project inwardly of the spar beam. 6. The child girder comprises a pair of facing pieces facing each other in the width direction, a connecting piece for connecting the facing pieces, and mounting pieces for attaching to a parent girder provided at both ends in the longitudinal direction of the connecting piece,
The cable rack according to any one of claims 1 to 5, wherein the attachment piece is provided with a cutout portion that communicates with the inner side of the child spar. 7. The sub-girder has attachment pieces for attaching to the parent girder at both ends in the longitudinal direction, and the attachment piece has a pair of ribs provided at both ends in the width direction. Item 7. The cable rack according to any one of items 6.