JP2006121872A - Fastener - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastener for eliminating the necessity of a dedicated metal fitting for attaching an earth bonding wire and a process for attaching the earth bonding wire to a cover and a rack. <P>SOLUTION: The fastener 12 for attaching the cover 8 to the rack 1 is formed with a second female screw 26 as a fixing hole for connecting the earth bonding wire 24. The adjacent racks 1, 1 and the covers 8, 8 are electrically connected and grounded by fastening a terminal of the earth bonding wire 24 to the second female screw 26. The dedicated metal fitting for attaching the earth bonding wire 24 and the process for attaching the earth bonding wire to the rack 1 and the cover 8 are unnecessary by the constitution. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fastener for fixing a cover main body to a rack, and more particularly to a structure of a fastener capable of connecting an earth bond wire.

  2. Description of the Related Art In recent years, buildings and factories that have become more intelligent use a large amount of various electric wires (cables) such as power cables, signal lines, and optical fibers. In order to efficiently route (wire) these cables in a space such as a ceiling, a so-called ladder-shaped rack (cable rack) including a main beam and a child beam is used.

  A cover is attached to the rack for the purpose of protecting the electric wire and aesthetic appearance. The cover is attached to the rack by, for example, combining L-shaped fastening brackets and U-shaped support brackets, attaching these brackets to the folded portion where the rack and the cover are overlapped, and tightening them with bolts (for example, Patent Document 1), a U-shaped attachment in a cross-sectional view is hooked on the upper part of the main girder, a cover is placed on the attachment part formed on the attachment covering the upper part of the main girder, screwed, and the screw There is a structure in which the front end portion is pressed onto the upper part of the main beam (see, for example, Patent Document 2).

  Since the rack and the cover support a plurality of cables, the rack and the cover are grounded to prevent danger in the event of electric leakage. As a method of grounding a rack, for example, when adjacent parent beams are fastened with bolts and nuts via connection fittings, a method of grounding by fastening a terminal of an earth bond wire together with these bolts and nuts is known. (For example, refer to Patent Document 3).

  Alternatively, as shown in FIG. 6 and FIG. 7, it is different from a connecting metal fitting for connecting the parent girders 101, 101 to covers 102, 102 respectively disposed on the adjacent parent girders 101, 101. There is known a method of grounding the adjacent covers 102 and 102 by fixing the ground wire mounting bracket 103 and mounting the terminal 105 of the ground bond wire 104 to the ground wire mounting bracket 103 with a screw 106. The ground wire mounting bracket 103 itself is fixed to the folded portion of the cover 102 with a hexagon bolt 107.

Alternatively, without using the ground wire mounting bracket 103, a hole is formed in the cover 102, and the terminal 105 of the ground bond wire 104 is screwed into the hole, so that the electrical connection between the adjacent covers 102, 102 is achieved. There are also known ways of doing this.
Japanese Utility Model Publication No. 60-5223 (pages 3 to 5, FIGS. 1 and 2) JP-A-58-22510 (pages 7 and 8, FIGS. 6, 7) JP-A-62-126814 (Pages 2 and 3; FIGS. 1 to 5)

  However, in the method of connecting the ground bond wire 104 to the ground wire mounting bracket 103, it is necessary to separately use the ground wire mounting bracket 103 different from the coupling bracket for connecting the parent girders 101 to each other. The cost increases as the number increases.

  Further, in the method of attaching the earth bond wire 104 by directly making a hole in the cover 102, it is necessary to make a hole in all of the cover 102, and the hole making operation is very troublesome. Furthermore, in this method, it is impossible to perform a drilling operation after laying the cover 102, and a drilling operation is necessary in advance.

  Accordingly, the present invention has been made to solve the above-described problems, and connects the earth bond wire without using a dedicated metal fitting for connecting the earth bond wire, and also connects the earth bond to the cover and the rack. It is an object of the present invention to provide a fastener that can be attached with an earth bond wire even after a cover is installed without requiring a wire attachment process.

  The present invention is characterized in that a stopper for attaching a cover body to a rack holding a cable is provided with a fixing hole for fixing an earth bond wire.

  According to the fastener of the present invention, a fixing hole for fixing the earth bond wire is formed in the fastener itself for attaching the cover body to the rack, and therefore a dedicated bracket for attaching the earth bond wire is used. Without this, the earth bond wire can be directly connected to the fixing hole formed in the stopper.

  Therefore, according to the present invention, a dedicated metal fitting for attaching the earth bond wire is not necessary, and it is not necessary to attach the earth bond wire to the cover and the rack. Further, even after the cover is installed, the earth bond wire is not required. Can be attached.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

  FIG. 1 is a partially broken perspective view showing a state in which a cover body is fixed to a rack with a fastener, FIG. 2 is an exploded perspective view showing a state before the cover body is fixed to the rack with a fastener, and FIG. FIG. 3A is a perspective view of the fastener when viewed from the other surface, FIG. 3B is a perspective view of the fastener when viewed from the other surface, and FIG. 4 sequentially shows the process of attaching the cover body to the rack. FIG. 5 is a perspective view showing a state in which adjacent racks are connected by an earth bond line.

  As shown in FIGS. 1 and 2, the rack (cable rack) 1 has two parent girders 2 and a plurality of child girders 3, and is arranged in parallel at predetermined intervals. A plurality of child girders 3 are installed at predetermined intervals along the longitudinal direction of the parent girders 2 and 2 so as to form a so-called ladder shape.

  The main girder 2 has bent pieces 5 and 6 formed by bending the upper and lower ends of a long plate-like substrate 4 substantially vertically in the same direction, and is substantially U-shaped in cross section. Yes. The child girder 3 is disposed substantially perpendicular to the longitudinal direction of the parent girder 2 and both ends thereof are fixed to a bent piece 6 formed on the lower end side of each parent girder 2.

  The rack 1 composed of the parent beam 2 and the child beam 3 has a connection hole 7 for fixing the racks 1 to each other with a bolt 22 and a nut 23 via a connection fitting 21. The connection holes 7 are formed as two rectangular holes in plan view in the vicinity of both ends in the longitudinal direction of the main beam 2.

  An electric wire is routed on the rack 1 with a child girder 3 as a support in a space sandwiched between a pair of parent girders 2 and 2, and a cover body 8 is attached for the purpose of protecting the electric wire and aesthetic appearance. It is done. The cover body 8 is formed as a long flat plate provided to cover the upper end portion of the rack 1. At both ends on the short side of the cover body 8, engaging portions 9 that are bent vertically toward the rack 1 side are formed over the entire longitudinal direction of the cover body 8. The engaging portion 9 has a screw insertion hole 11 through which a fixing screw 10 for fixing a stopper, which will be described later, is inserted.

  As shown in FIG. 3 and FIG. 4, the stopper 12 is in contact with the bent piece 5 on one surface 13a and on the other side 13b and on the cover body 8 and its parent A drop-out that is connected to the girder holding portion 13 and abuts against the substrate 4 at one surface 14a, and abuts against the engaging portions 9 provided at both ends on the short side of the cover body 8 at the other surface 14b. A hook portion 15 that is formed in a substantially L shape in cross-section and includes a prevention portion 14, is provided at the distal end portion of the main beam holding portion 13, and is bent and engaged with the distal end portion 5 a of the bent piece 5; have.

  The dropout prevention portion 14 is provided with a first female thread portion 16 that communicates with a screw insertion hole 11 formed in the engagement portion 9. In addition, the drop-off prevention part 14 is provided with a fixing hole for attaching an earth bond wire 24 that electrically connects adjacent racks 1, 1 and / or cover bodies 8, 8 to each other and grounds them. . Such a fixing hole is formed as a second female screw portion 26 for fixing a terminal (not shown) of the earth bond wire 24 with a ground wire fixing screw 25. The second female screw portion 26 is provided at a position below the first male screw portion 16 and not hidden by the engaging portion 9 of the cover body 8.

  The parent girder holding portion 13 is placed in close contact with the bent piece 5 formed on the upper portion of the parent girder 2 and holds the parent girder 2. The drop-off prevention portion 14 is provided to face the upper surface side substrate surface 4a on which the bent piece 5 is formed, and comes into contact with the substrate 4 when an external force is applied to the stopper 12 to stop the main girder 2 from stopping. The metal fitting 12 is prevented from falling off.

  The parent girder holding portion 13 and the drop-off preventing portion 14 are formed with a bulging portion 17 that is raised (projected) toward the cover body 8 side. The bulging portion 17 is formed in almost the entire region excluding the vicinity of both ends, and by securing an appropriate space between the lower surface 8a of the cover body 8 and the bent piece 5, a connection fitting described later covers Make sure that the body 8 cannot be attached when the body 8 is attached.

  More specifically, the main girder 2 includes a connecting bracket for connecting the racks 1 to each other and a steady rest bracket for fixing the main girder 2 on a short hanger, and the main girder 2 is a hanging bolt. A main girder hanger or the like (which is simply referred to as a connection fitting) for directly fixing to the frame is attached. Since these connection fittings have a structure in which the upper and lower ends of the main girder 2 are clamped by a clamping member, the clamping members of the connection fitting protrude vertically from the upper and lower end surfaces of the parent girder 2. Therefore, when the height of the stopper metal 12 is lower than the height of the connection metal, the connection metal comes into contact with the lower surface 8a of the cover body 8, and the position of the screw insertion hole 11 formed in the engagement portion 9 described above, Deviation occurs in the position of the first female thread portion 16 formed in the stopper metal 12, and the cover body 8 cannot be attached or the cover body 8 is bent. Therefore, the cover body 8 is formed by forming a bulging portion 17 at least in the parent beam holding portion 13 and securing a space between the lower surface 8a of the cover body 8 and the bent piece 5 so as not to contact the connection fitting. Inadequate attachment to the bent piece 5 is avoided.

  In addition, a reinforcing rib 18 is formed in the central portion of the main beam holder 13 so as to be recessed toward the bent piece 5 for the purpose of increasing the mechanical strength of the stopper 12 formed by bending a thin plate. Yes. Further, a rectangular cutout portion 19 is formed at a connecting portion between the main beam holding portion 13 and the dropout prevention portion 14. The reason why the notch 19 is provided at the location is to form the flat portion 20 for providing the first female screw 16 at a height close to the hook 15.

  The flat surface portion 20 is formed by bulging the central portion of the drop-off prevention portion 14 to the side opposite to the side facing the substrate 4. And the 1st internal thread part 16 is provided in the upper position of this plane part 20, ie, the position close | similar to the height position of the hook part 15. FIG. The first reason why the first female thread portion 16 is provided at a position close to the height position of the hook portion 15 is that, when the first female thread portion 16 is provided below, the length of the engaging portion 9 is long. This is because the cover body 8 is enlarged and the material cost is increased. The second reason is that, in the state before the cover body 8 is attached, the hook portion 15 is not engaged with the distal end portion 5a of the bent piece 5, so that the first portion is located near the lower end portion of the drop preventing portion 14. The more the female screw portion 16 is provided, the easier it is for the stopper 12 to fall off when the cover body 8 is inclined when the fixing screw 10 is attached or when a downward force is applied to the fixing screw 10 with a screwdriver. However, by providing the first female thread portion 16 at a position close to the height position of the hook portion 15, it is possible to avoid the stopper 12 from falling off.

  The hook 15 is provided at the tip of the main beam holder 13 and is bent toward the substrate 4 in a dogleg shape. The hook 15 is engaged with the tip 5 a of the bent piece 5 and is locked so that the stopper 12 is not detached from the parent beam 2.

  In order to fix the cover body 8 to the rack 1 configured as described above with the fastener 12 of the present embodiment, first, as shown in FIG. 5, the hook 15 of the stopper 12 is hooked, and the stopper 12 is rotated around the hook 15 in the direction indicated by the arrow in FIG. Then, as shown in FIG. 4B, a gap S1 is provided between the hook portion 15 and the front end portion 5a of the bent piece 5, and the stopper 12 is temporarily fixed to the parent beam 2. That is, when the stopper 14 of the stopper 12 is brought into close contact with the substrate 4 and the stopper 12 is attached to the main beam 2, a gap S1 is formed between the hook 15 and the tip 5a of the bent piece 5. The

  Next, the cover body 8 is attached so as to cover the stopper 12 from above the stopper 12 temporarily fixed to the main beam 2. When the cover body 8 is attached, even if the stopper metal 12 comes into contact with the engaging portion 9 of the cover body 8, the stopper metal 12 can move in the horizontal direction because it has the clearance S1, so the cover body 8 can be racked. 1 can be attached. When the cover 8 is attached to the main beam 2 without the stopper 12 coming into contact with the engaging portion 9, there is a gap between the drop-off preventing portion 14 and the engaging portion 9 as shown in FIG. S2 occurs.

  Next, after engaging the hook portion 15 of the stopper 12 with the tip portion 5a of the bent piece 5, the fixing screw 10 is inserted through the screw insertion hole 11 formed in the engaging portion 9 as shown in FIG. The metal fitting 12 is screwed into the first female thread portion 16. Thereby, the cover body 8 covers and fixes the upper part of the rack 1.

  Next, the terminals provided at both ends of the earth bond wire 24 are fixed to the second female screw portion 26 formed on the stopper 12 fixed to each rack 1 with the earth wire fixing screw 25. Thereby, the fasteners 12 and 12 attached to the adjacent racks 1 and 1 are connected to each other by the earth bond wire 24, and the racks 1 and 1 (between) and the cover bodies 8 and 8 (between) are connected. Both are electrically connected and grounded (grounded) at a portion not shown.

  Similarly, when the cover body 8 is attached to the lower end portion of the rack 1, the fastener 1 is temporarily fixed to the lower end portion of the main beam 2, and the cover body 8 is fixed to the fastener 12 with the fixing screw 10, thereby the rack 1. The cover body 8 can be attached to the upper and lower sides. Note that the earth bond wire 24 may be attached to the fastener 12 attached to the lower end of the rack 1. In short, if the adjacent racks 1, 1 and the cover bodies 8, 8 can be electrically connected, the earth bond wire 24 can be attached to the fasteners 12, 12 at either the upper end or the lower end of the rack 1. Good.

  As described above, according to the present embodiment, the second female screw portion 26 for attaching the earth bond wire 24 is formed on the fastener 12 for attaching the cover body 8 to the rack 1. The earth bond wire 24 can be directly connected to the second female screw portion 26 formed in the stopper 12 without using a dedicated metal fitting for attaching the 24.

  Therefore, a dedicated metal fitting for attaching the earth bond wire 24 is not necessary, and attachment processing (for example, hole machining) of the earth bond wire 24 to the rack 1 and the cover body 8 is also unnecessary. Furthermore, even after the cover body 8 is attached to the rack 1, the earth bond wire 24 can be attached to the fastener 12, and the connection work can be greatly simplified.

  Further, according to the present embodiment, even after the cover body 8 is attached to the upper part of the main beam 2, the cover body 8 is attached to the lower part of the main beam 2 without removing the cover body 8. Can do.

  Moreover, according to this Embodiment, since the cover body 8 is attached from the top of the metal fitting 12, external force does not act on the metal fitting 12, and the metal fitting 12 does not fall off.

  Further, according to the present embodiment, since the stopper 12 does not protrude into the wiring space of the rack 1, the wiring space is not reduced.

  Although specific embodiments to which the present invention is applied have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made.

  In the above-described embodiment, the present invention is applied to the fastener 12 for attaching the cover body 8 to the rack 1 in which the wiring is routed. However, the cover body is not used for routing the wiring. It goes without saying that the present invention can be applied to the fasteners for mounting.

It is a perspective view which shows a mode that a cover body is fixed to a rack with a metal fitting, and a part is fractured | ruptured. It is a disassembled perspective view which shows the state before fixing a cover body to a rack with a fastener. 3A is a perspective view of the fastener when viewed from one surface, and FIG. 3B is a perspective view of the fastener when viewed from the other surface. It is process drawing which shows the process of attaching a cover body to a rack one by one. It is a perspective view which shows the state which attached the earth bond line between adjacent racks. It is a perspective view of the conventional structure which shows the state which connected adjacent covers with the earth bond wire. It is a disassembled perspective view which shows the earth bond wire connection structure shown in FIG.

Explanation of symbols

1 ... rack 2 ... parent girder 3 ... child girder 4 ... substrate (substrate of parent girder)
5, 6 ... Bending piece 8 ... Cover body 9 ... Engagement part 10 ... Fixing screw 11 ... Screw insertion hole 12 ... Fastener 13 ... Parent girder holding part 14 ... Fall-off prevention part 15 ... Hook part 16 ... First female screw part 24 ... Earth bond wire 26 ... Second female thread (fixing hole)

Claims (4)

In the fasteners for attaching the cover body to the rack holding the cable,
A fastener with a fixing hole for fixing the earth bond wire. A main girder in which bent pieces are formed on the upper and lower end portions of a long plate-like substrate, the bent pieces are faced to each other and arranged in parallel at a predetermined interval, and between the one bent piece of the parent girder, A fastener for attaching a cover body to at least either the upper end portion or the lower end portion of the rack with respect to a rack in which a plurality of child girders are installed at a predetermined interval in the longitudinal direction of the main girder,
A main girder holding portion that abuts the bent piece on one surface and abuts the cover body on the other surface, and abuts the substrate on one surface connected to the parent girder holding portion. And a drop-off preventing portion that comes into contact with the engagement portions provided at both ends of the cover body on the short side of the cover body, and is configured in a substantially L shape in cross-section, and the distal end portion of the parent girder holding portion A hook portion formed to be bent to engage with the tip end portion of the bent piece, and a drop-off preventing portion, a first female screw portion communicating with a screw insertion hole formed in the engaging portion, and an earth bond A fastener having a second female screw portion to which the wire is fixed. The fastener according to claim 2,
A stopper that covers the stopper and that the cover body is mounted on the stopper. At least a fastener according to any one of claims 1 to 3,
A fastener, wherein a plurality of racks are connected, and an earth bond wire is fixed so as to connect fasteners attached to adjacent racks.

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