JP2998029B1 - Earth bond wire connection device - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To easily connect an earth bond wire terminal to a metal plate without making a hole. SOLUTION: A substrate 31, a folded plate 32 folded from one end of the substrate to one surface side of the substrate, and a first and second folded plate are bent vertically from the other end of the substrate to the same surface side of the substrate.
Mounting plate 3 comprising a bent plate 34 having screw holes
0, the one surface of the substrate 31 is brought into contact with the outer surface of the flange 36 at the end of the metal plate 2, the folded plate 32 is positioned on the inner surface side of the flange 36, and the first screw hole of the bent plate 34 is formed. The metal plate 2 is clamped between the folded plate 32 and the bolt 41, and the second screw hole of the bent plate 34 is aligned with the hole of the ground bond wire terminal 11 and screwed. .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground bond wire connector for electrical connection between connecting portions such as metal racks and ducts.

[0002]

2. Description of the Related Art Metal cable racks are widely used for wiring electric cables in buildings, factories, station buildings, and other buildings. As shown in FIGS. 12 and 13, the cable rack 1 has a ladder-like structure in which parent parallel girders 2 and 2 are connected at regular intervals to vertical child girders 3, 3,. It can be lowered or installed on the floor,
3. Used to carry electric cables and the like along the top for wiring. Since the length of this cable rack is limited, when a distance such as wiring is long, a plurality of cable racks are used by connecting them in the longitudinal direction.

When two cable racks are connected in the same linear direction, a metal flat connection plate is used to connect the two cable racks.
Since the two ends of the connecting plate are fixed to the ends of the adjacent parent girders of the two cable racks, the two adjacent cable racks are in a state of being strongly coupled electrically.

However, for example, when two cable racks 1 and 1 are connected by being inclined in the horizontal direction as shown in FIG. 12, two separate plate bodies 4a and 4b are made rotatable by hinges 5. Since the main girders 2 and 2 are connected by the connecting device 6, 2
The electrical connection between the two cable racks 1 and 1 becomes insufficient.

[0005] In addition, for example, as shown in FIG. 13, even when connecting by being inclined in the vertical direction, two separate plate bodies 7 a and 7
Since b is connected by the connecting device 9 which is rotatable by the bolt 8, the electrical connection between the two adjacent cable racks 1 and 1 becomes insufficient.

If the electrical connection between the two adjacent cable racks 1 and 1 is insufficient as described above, a potential difference may be generated between the two racks and various electrical failures may occur. It is obliged by an electric law to connect the ground bond wire 10 between the two racks 1 and 1 as described above.

Conventionally, the connection of the terminal 11 of the earth bond wire 10 is mainly performed by the following three methods. (A) In order to connect the earth bond wire 10 to the main girder 2,
As shown in FIG. 14, a hole (not shown) is made in the parent girder 2 with a drill or the like, and the screw shaft 1 of the bolt 14 is inserted from inside the parent girder 2.
4a is inserted outside the hole, and the toothed washer 1 is inserted into the screw shaft 14a.
5, the nut 16 is tightened to press the toothed washer 15 against the outer surface of the main girder 2.
7. After passing through the terminal 11, the flat washer 18 and the spring washer 19 of the earth bond wire 10, the nut 20 is tightened.

(B) As shown in FIG. 15, a hole 22 is drilled in the parent girder 2 by a drill or the like, and the terminal 11 of the earth bond wire 10 is
The terminal 11 is fastened to the outer surface of the main girder 2 by passing a self-tapping screw 23 through the hole 11a and screwing it into the hole 22 of the main girder 2 with a screwdriver.

(C) In the cable rack 1, as shown in FIG. 16, screw holes (not shown) at the ends of the
A screw 25 is screwed into the hole 2d of the main girder 2 and the end of the sub girder 3 is fixed to the main girder 2. The screw 25 is removed with a screwdriver and the hole 11a of the terminal 11 of the earth bond wire 10 is removed.
The screw 25 is passed through the hole 2d of the main girder 2 and the screw 25 is again screwed into the screw hole at the end of the sub girder 3 with a screwdriver to fix the end of the sub girder 3 to the main girder 2 together with the terminal 11. .

[0010]

However, in the method (a) (FIG. 14), drilling is required at the construction site, which is very troublesome and time-consuming, and the scaffold at the construction site is unstable. In some cases, the work involves danger. In addition, since many washers and nuts are mounted, it takes time and effort. When it is desired to change the mounting position of the terminal 11 of the earth bond wire 10 due to the length of the earth bond wire 10 or interference with other objects, the hole is drilled again at another position and a large number of washers or You have to change nuts and so on, which is very troublesome.

In the method (b) (FIG. 15),
Drilling is required at the construction site, which is very troublesome and time-consuming. In addition, if the scaffold at the construction site is unstable, the work is dangerous. Further, since the tapping screw 23 is screwed into the hole 22 formed in the thin parent girder 2, the tapping screw 23 is easily loosened, and the electrical connection between the terminal 11 and the parent girder 2 tends to be insufficient. In addition, if it is desired to change the mounting position of the terminal 11 of the earth bond wire 10 due to the length of the earth bond wire 10 or interference with other objects, it is necessary to drill a hole at another position again. It is.

In the method (c) (FIG. 16),
Since the screw 25 that firmly fixes the end of the child girder 3 and the parent girder 2 must be removed once, this removal work is troublesome. There is a possibility of causing the above problem.

An object of the present invention is to provide an earth bond wire connecting device which solves these problems.

[0014]

According to a first aspect of the present invention, there is provided an apparatus for connecting a ground bond wire according to the present invention.
A substrate, a folded plate that is folded from one end of the substrate to one surface of the substrate, and a folded plate that is vertically folded from the other end of the substrate to the same surface of the substrate and has first and second screw holes. A mounting plate comprising a bent plate, wherein the one surface of the substrate is brought into contact with the outer surface of the flange, the folded plate is positioned on the inner surface side of the flange, and a screw is inserted into a first screw hole of the bent plate. The metal plate is clamped between the end of the folded plate and the end of the bolt, and the second screw hole of the bent plate is aligned with the hole of the ground bond wire terminal and screwed. Like that.

According to a second aspect of the present invention, the substrate, a folded plate folded from one end of the substrate to one surface of the substrate, and a folded plate vertically folded from the other end of the substrate to the same surface of the substrate,
A mounting plate comprising a bent plate having first and second screw holes, the one surface of the substrate being brought into contact with an outer surface of the flange, the folded plate being positioned on an inner surface side of the flange, Tightening a bolt screwed into the first screw hole of the bent plate, pressing the protruding end of the flange against the inner surface of the base of the folded plate, and pressing the metal plate with the tip of the bolt, The hole of the ground bond wire terminal is aligned with the second screw hole of the bent plate and screwed.

[0016] Thus, the troublesome work of drilling a metal plate with a drill is not required, and mounting can be performed simply by tightening bolts.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an earth bond wire connecting device according to an embodiment of the present invention, which is connected to a parent girder (metal plate) of a cable rack.

This earth bond wire connection device includes a mounting bracket 30. The mounting bracket 30 has a rectangular flat plate-like substrate 31, a folded plate 32 that is folded obliquely from one end of the substrate 31 to one surface of the substrate 31, and a folded plate 32 that is folded from the other end of the substrate 31 to the same surface of the substrate 31. Bent vertically,
Folded plate 3 having first and second screw holes 33a, 33b
4

The length of the substrate 31 in the direction perpendicular to the bent plate 34 is, as shown in FIG. 2, protruded from both ends of the parent girder 2 from the vertical end of the parent girder 2 of the cable rack 1. The width is set to be larger than the width of the flange 36. The length of the bent piece 32 in the direction parallel to the substrate 31 is set to be larger than the width of the protrusion of the inner side 36 a of the main beam 2 of the flange 36.

The first and second screw holes 33a and 33b of the bent plate 34 are formed by forming a thread groove on the inner surface of the tap hole by pressing when the thickness of the mounting bracket 30 is small. Have been.

As shown in FIG. 4, a connecting device (for example, FIG. 1)
The mounting bracket 30 is attached to each end of the two cable racks 1 and 1 connected by the same connecting device 9) as shown in FIG.
Install.

That is, first, when mounting to one of the screw holes of the mounting bracket 30, for example, the cable rack 1 on the left side in FIG. 4, the bolt 40 is inserted into the first screw hole 33a so that the tip portion 41a of the shaft portion 41 is slightly. At the end of the cable rack 1, from below the flange 36 at the lower end of the main girder 2, the base 32a of the folded plate 32 of the mounting bracket 30, as shown in FIGS. An inner flange 36a is inserted into the inner surface so that the folded plate 32 is positioned on the upper surface side of the inner flange 36a, and the inner surface of the base 32a of the folded plate 32 is used as a fulcrum to mount the mounting bracket 30.
Is rotated counterclockwise to bring the upper surface of the substrate 31 into contact with the lower surface of the flange 36.

The first screw hole 33 of the bent plate 34
The bolt 40 screwed to a is rotated by a driver so that the tip 41 a of the bolt 40 abuts on the outer surface of the master girder 2. When the bolt 40 is further rotated from this state, since the bolt tip portion 41 is in contact with the master girder 2, the mounting bracket 30 is rotated.
Moves to the right (FIG. 2), and the folded plate 3
The two tips 32b are in contact. Therefore, when the bolt 40 is strongly tightened in this state, the parent girder 2 is strongly clamped between the tip 32b of the folded plate 32 and the tip 41a of the bolt 40. In this state, in the mounting bracket 30, the board 31 abuts on the lower surface of the flange 36, the folded plate 32 is located on the upper surface side of the inner flange 36a, and the bolt 40 is located on the upper surface side of the outer flange 36b. Since the main girder 2 as a plate is strongly sandwiched between the inner and outer surfaces by the distal end 32b of the folded plate 32 and the distal end portion 41 of the bolt 40, the mounting bracket 30 does not come off from the main girder 2 even when a strong external force is received. , It is in a state of being electrically connected securely.

The second screw hole 33b of the bent plate 34 is aligned with the hole 11a of the terminal 11 of the earth bond wire 10 and screwed with a screw 42 as shown in FIG.

In this manner, the mounting brackets 30, 30 are attached to the respective ends of the respective main girders 2, 2 of the two cable racks 1, 1 connected by the connecting device 9, and the terminals at both ends of the earth bond wire 10 are provided. When the terminals 11 and 11 are attached to the respective mounting brackets 30 and 30, the terminals 11 are screwed to the mounting brackets 30 which are electrically connected to the parent girder (metal plate) 2 as described above, and are electrically secured. Therefore, even if the electrical connection between the two cable racks 1 and 1 by the connecting device 9 is insufficient, the electrical connection can be reliably performed by the ground bond wire 10.

Although the leading end 32b of the folded plate 32 may be linear as shown in FIG. 5, the leading end 32b of the folded plate 32 may have two projecting portions 32 on both sides as shown in FIG.
b 'and 32b', the bolt tip 41a is 2
Since the main girder 2 is pressed between the two projections 32b ', 32b', rattling is less likely to occur and electrical connection is further ensured. Also, as shown in FIG.
b 'and 32b' may be rounded. Further, three or more protrusions may be provided.

As shown in FIG. 7, if a conical inner recess 41b is provided at the tip 41a of the shaft 41 of the bolt 40, an annular projection 41c is formed at the tip 41a, and this annular projection 41c is formed. The electrical connection is further ensured since the contact is made to bite into the outer surface of the parent girder 2.

Note that, as shown in FIGS.
The length of 2 may be set smaller than the projection width of the inner flange 36a.

In this way, when the bolt 40 is tightened from the state where the tip portion 41a of the bolt 40 is in contact with the outer surface of the parent girder 2, the inwardly projecting end portion 36 of the inner flange 36a is formed.
a 'is strongly pressed against the inner surface of the base 32a of the folded plate 32, and the distal end portion 40a of the bolt 40 is strongly pressed against the outer surface of the main girder 2, so that the mounting bracket 30 is fixed to the main girder 2. The folded plate 32 may have an L-shaped cross section as shown in FIG.

In the above description, the cable rack 1
Flanges 36a on both the inside and outside at the lower end of the parent girder 2
The mounting bracket 3 according to the present invention has a protrusion 36b.
Although an example in which 0 is fixed has been described, even when the main girder 2 is provided with the flange 36a only on one side inward as shown in FIG.
Similarly, the mounting bracket 30 of the present invention can be fixed.

In the above description, the case where the mounting bracket 30 of the present invention is fixed to the lower end of the parent girder 2 of the cable rack has been described, but it may be fixed to the upper end of the parent girder. It is needless to say that the fitting of the present invention can be attached not only to the rack but also to a connecting portion such as a duct or other metal installation.

[0032]

As described above, according to the present invention,
The troublesome and dangerous work of drilling a metal plate (such as the main girder 2 of a cable rack) with a drill at the construction site is not required, and only the bolt 40 needs to be tightened. Is significantly easier,
Work time can be greatly reduced. Therefore, the mounting position of the mounting bracket 30 of the present invention can be easily changed as necessary.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a side view showing a use state of the embodiment of FIG. 1;

FIG. 3 is a plan view showing a use state of the embodiment of FIG. 1;

FIG. 4 is a side view showing a use state of the embodiment of FIG. 1;

FIG. 5 is a perspective view showing another embodiment of the present invention.

FIG. 6 is a perspective view showing another embodiment of the present invention.

FIG. 7 is a sectional view of an embodiment of a bolt used in the present invention.

FIG. 8 is a side view showing another embodiment of the present invention.

FIG. 9 is a plan view of the embodiment of FIG. 8;

FIG. 10 is a side view showing another embodiment of the present invention.

FIG. 11 is a side view showing another embodiment of the present invention.

FIG. 12 is a perspective view showing a state of connection of an earth bond wire in a connection portion of a conventional cable rack.

FIG. 13 is a perspective view showing a state of connection of an earth bond wire in a connection portion of a conventional cable rack.

FIG. 14 is a plan view showing a method of attaching a conventional earth bond wire terminal.

FIG. 15 is a perspective view showing a method of attaching a conventional earth bond wire terminal.

FIG. 16 is a perspective view showing a method of attaching a conventional earth bond wire terminal.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 cable rack 2 parent girder 10 ground bond wire 11 terminal 30 mounting bracket 31 substrate 32 folded plate 33 a first screw hole 33 b second screw hole 34 bent plate 36 flange 36 a inner flange 36 b outer flange 40 bolt 42 screw

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01R 4/38-4/46 H01R 4/64-4/66 H02G 3/00 301

Claims (2)

(57) [Claims] 1. A connection device for connecting an earth bond wire terminal to a metal plate having a flange at an end, comprising: a substrate; a folded plate folded from one end of the substrate to one surface of the substrate; A mounting plate consisting of a bent plate having a first and a second screw hole bent vertically from the other end of the substrate to the same surface side of the substrate, wherein the one surface of the substrate is provided on an outer surface of the flange. Abut,
Positioning the folded plate on the inner surface side of the flange, tightening a bolt screwed into a first screw hole of the folded plate,
The metal plate is sandwiched between the end of the folded plate and the end of the bolt, and the hole of the ground bond wire terminal is aligned with the second screw hole of the bent plate and screwed. Earth bond wire connection device. 2. A connection device for connecting an earth bond wire terminal to a metal plate having a flange at an end, comprising: a substrate; a folded plate folded from one end of the substrate to one surface of the substrate; A mounting plate consisting of a bent plate having a first and a second screw hole bent vertically from the other end of the substrate to the same surface side of the substrate, wherein the one surface of the substrate is provided on an outer surface of the flange. Abut,
Positioning the folded plate on the inner surface side of the flange, tightening a bolt screwed into a first screw hole of the folded plate,
The protruding end of the flange is pressed against the inner surface of the base of the folded plate, and the metal plate is pressed with the tip of the bolt, and the hole of the ground bond wire terminal is inserted into the second screw hole of the bent plate. An earth bond wire connection device characterized by matching and screwing.