JPS6126289B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connection device for a bus duct, particularly a bus duct that is fastened all at once, such as an insulated conductor contact type or an interphase reduction type.

The connection device for the above type of bus duct is shown in Figure 1~
The bus duct D ₁ to be connected as shown in Fig. 3,
D ₂ in-phase conductors 1, 1, 2, 2, 3, 3 are stacked, different-phase in-phase conductors 1 and 2, 2 and 3, one outermost conductor 1 and duct side plate joint plate 4, the other outermost conductor An insulating separator 5 is sandwiched between the duct side connecting plate 3 and the duct side connecting plate 4, and an insulated bolt 6 is passed through the duct side connecting plate 4, the insulating separator 5, and the conductors 1, 2, and 3, and then tightened with a nut 7. and tighten. Then, the upper and lower open surfaces of the connecting portion are covered with lids 8, 8, respectively, and fixed with screws 9 or the like.

Also, as shown in the examples in Figs.
with the above insulating separator 5, conductors 1, 2,
3. Pass the bolt 6 through the joint plates 4, 4 on both sides at the top and bottom positions avoiding the patch plate 10, and tighten the nut 7.
There is also a structure in which the upper and lower open surfaces are covered with lids 8.

However, with the conventional bus duct connection device described above, there are cases where the user forgets to compress and tighten the fasteners consisting of the bolts 6, nuts 7, etc., and the lid 8 is closed in a temporarily tightened state, resulting in incomplete contact between the connections. That part may generate heat and cause an accident.

Therefore, after the construction of the bus duct is completed, it is obligatory for the person in charge of management to check the degree of tightening of the connecting device, but due to the recent increase in the height of buildings and the rationalization of bus duct installation space, it is difficult to check the tightness. increasing in complexity and complexity.

The present invention aims to solve the above-mentioned problems by tightening the fasteners 6, 7 so that the lid 8 cannot be fitted unless the fasteners 6, 7, etc. for connecting conductors are compressed. This prevents forgetting.

That is, the bus duct connection device having the above structure is provided with a means for preventing the connection part lid 8 from fitting, and when the fasteners 6 and 7 are compressed and tightened, the lid fitting prevention function of the means is lost. The present invention is characterized in that it is constructed so as to enable fitting attachment of 8.

Embodiments of the present invention will be described below with reference to the drawings.
In the example shown in FIG. 2, a flexible piece having an arcuate cross section and approximately the same length as the width of the connecting plate 4 is provided between the outer surface of the duct side connecting plate 4 and the dish-shaped spring washer 11 as a cover fitting prevention means. The rectangular plates 12 are arranged with their convex surfaces facing outward.

The flexible rectangular plate 12 has a bolt hole ₁₂₁ in the center, and is rigid enough not to be deformed by tightening the bolts 6 and nuts 7 with bare hands. Therefore, as shown in FIG. 3, even if the lid 8 is attempted to be fitted in the temporarily tightened state, the edge ₈₁ of the lid 8 will catch on the end surface ₁₂₂ of the rectangular plate 12 and will not fit.

Therefore, when the bolts 6 and nuts 7 are compressed and tightened using a tool such as a torque wrench, the rectangular plate 12
becomes flat as shown in FIG. 4, and the lid 8 can be fitted correctly.

The flexible rectangular plate 12 can be made of a thin plate of steel, stainless steel, aluminum, etc., but it can be reused if it has spring properties.

FIG. 5 shows that a rectangular plate 12 with an arcuate cross section as a lid fitting prevention member is provided with the function of the dish-shaped spring washer 11 in the example shown in FIG.
It was designed so that it could be kept in place.

That is, a rectangular plate 12 is a spring plate corresponding to a spring washer.
A hook portion 13 extending inward of the arc is provided at the center of both ends in the longitudinal direction, and the hook portion 13
is hooked into a recess 14 on the side edge of the joint plate 4. Therefore, the washer 11' can be a rectangular flat plate so that the pressing force of the bolt 6 and nut 7 can be effectively transmitted to the rectangular plate 12.

In the case of the embodiments shown in FIGS. 2 and 5 above, if the connection part is forgotten to tighten, the lid 8 is not properly attached, and the forgetting to tighten it is obvious at a glance.

In addition, although it is possible to forget to put on the lid 8 even after compression tightening, the tightening condition can be confirmed by checking whether the rectangular plate 12 is flattened or not.

Since the rectangular plate 12 is properly tightened when it becomes flat, complete tightening is possible without using a tool with a tightening torque setting device such as a torque wrench.

FIG. 21 is another modification of the example in FIG.
A vertically long U-shaped piece 121 is used instead of the rectangular plate 12 having an arcuate cross section in the illustrated example, and a spring member 122 is inserted between this and the duct side plate joint plate 4 to temporarily tighten the fasteners 6 and 7. left and right U-shaped pieces 12 in
1,121 is maintained slightly wider than the width of the lid 8. When the fasteners 6, 7 are compressed and tightened, the spring member 122 is deformed flat and the U-shaped piece 121 approaches the joint plate 4, allowing the lid 8 to be fitted.

Next, FIG. 6 shows an embodiment in which the lid fitting prevention means is provided directly on the duct side plate connecting plate 4, and the reinforcing bent edge 4 ₁
A cut-and-raised portion 15 is provided from approximately the center of the longitudinal side edge of the joint plate 4 where the washer 11 is formed to approximately the center where the washer 11 is hung. The portion 15 is designed to protrude outward.

Therefore, even if an attempt is made to close the lid 8 in the temporarily tightened state, the edge ₈₁ of the lid 8 will catch on the end surface 151 of the cut-and-raised portion ₁₅ and will not close as shown in FIGS. 7 and 8. When the fasteners 6 and 7 are compressed and tightened, the cut-and-raised portion 15 is pressed by the washer 11 and becomes flush with the joint plate 4, so that the lid fitting prevention function is lost and the lid 8 can be correctly attached.

In the example shown in FIG. 9, uneven portions 16 and 17 that fit into each other are relatively formed on the duct side plate joint plate 4 and the insulating separator 5 that is in contact with it, and the uneven portions 16 and 17 are positioned opposite each other between the two 4 and 5. cross one end 1
8 ₁ is fixed to the joint plate 4 or separator 5 by appropriate means, and the other end 18 ₂ is interposed with a thin plate 18 having a length protruding beyond the side edge of the joint plate 4 to constitute a lid fitting prevention means. It is something.

When the fasteners 6 and 7 are tightened with bare hands, the thin plate 18
Since the uneven parts 16 and 17 cannot be fitted together, the gap between the left and right connecting plates 4 and 4 is wider than the width of the lid 8, and furthermore, the outer end ₁₈₂ of the thin plate 18 is separated from the edge of the connecting plate 4. It stands out. Therefore, the lid 8 cannot be closed.

When the fasteners 6 and 7 are compressed and tightened, the uneven parts 16 and ₁₇ fit together with the thin plate 18 sandwiched between them as shown in FIG. or lower, and the lid 8 can be fitted and attached.

The lid fitting prevention thin plate 18 is made of an elastic material such as a steel plate, and can be a rectangular plate that is long in the width direction of the duct side plate joint plate 4. The uneven portions 16 and 17 are provided in the form of several dots arranged horizontally. Or provide it in the shape of a single character.

In FIG. 11, a part 19 is provided in a part of the duct side plate joint plate 4, which is deformed by pressure by a projection formed on the outermost insulating separator.As shown in FIG. 7 is temporarily tightened, the protrusion 17 of the outermost insulating separator 5 is attached to the joint plate 4.
In doing so, the interval between the left and right connecting plates 4, 4 is kept wider than the width of the lid 8. Therefore, the lid 8 gets caught on the joint plate 4 and cannot be properly attached. The deformable portion 19 is cut in advance or formed thinly.

When the fasteners 6 and 7 are compressed and tightened, the portion 19 of the joint plate 4 is deformed or torn by the protrusion 17, as shown in FIG. 13, and the joint plate 4 and the insulating separator 5 are brought into close contact. Therefore, the distance between the left and right connecting plates 4, 4 is narrowed, and the lid 8 can be attached.

Figure 14 shows each connected bus duct D1 and D.
The lid fitting prevention means of the present invention is provided at the connecting portion in which duct side plate connecting plates 4 and 4' are fixed to the two ends, respectively, and the connecting plates 4 and 4' are stacked inside and outside like the conductors. This is an example.

That is, a convex portion 20 is provided on the opposing surface side of either one of the joint plates 4, 4', which is deformed flat by compression tightening of the fasteners 6, 7. does not deform, the interval between the outermost joint plates is expanded to be larger than the width of the lid 8, and the lid 8 cannot be closed.

Although the convex portion 20 in the embodiment is a separate member attached to the joint plate, it may be formed by cutting and raising a part of the joint plate.

FIG. 15 shows an embodiment in which the fastening connection part is narrower than the width of the bus duct main body, and shows a rectangular cross section with an arcuate cross section as the lid fitting prevention member in the examples of FIGS. 2 and 5. It is sufficient to increase the degree of protrusion of the plate 12, but the illustration shows the upper and lower fasteners 6,
As shown in FIG. 17, between the rectangular spring washer 21 commonly attached to the joint plate 4 and the joint plate 4, there is provided a vertically elongated piece having a cut-out portion 22 projecting outward in the center of the vertical side. A shape piece 23 is interposed therebetween.

As shown in FIG. 15, when the fasteners 6 and 7 are temporarily tightened, the cut and raised portion 22 is stretched, so that the U-shaped piece 23 is separated from the joint plate 4. Therefore, even if an attempt is made to attach the lid 8, its edge ₈₁ will not come into contact with the folding line ₂₃₁ of the U-shaped piece 23, as shown in FIG.

When the fasteners 6 and 7 are compressed and tightened, the cut and raised portion 2
2 is crushed and the U-shaped piece 23 is brought into close contact with the joint plate 4, so that the lid 8 can be fitted and attached.

Note that instead of the U-shaped piece 23 in the example shown in FIG. 15, it is also possible to provide the spring washer 21 itself that presses the U-shaped piece 23 with a lid fitting prevention function. That is, the 18th
Both ends 21 of a rectangular spring washer 21 as shown in the figure
₁ and 21 1. Since the ends 21 ₁ of the spring washer ₂₁ do not bend even if the fasteners 6 and 7 are temporarily tightened, the lid Even if an attempt is made to close the spring washer 21, the side edge ₈₁ will catch on the end ₂₁₁ of the spring washer 21 and will not fit. When the fasteners 6 and 7 are completely tightened, the end ₂₁₁ of the spring washer 21 is raised, so that the lid fitting prevention function is eliminated and the lid 8 can be correctly attached.

The lid fitting prevention means (second
Figure, Figure 5 Example...Flexible rectangular plate 1 with an arc-shaped cross section
2. Example in FIG. 6: cut-and-raised portion 15 on duct side joint plate 4, example in FIG. 9: uneven portions 16, 17 formed relative to duct side joint plate 4 and insulating separator 5
and an elastic thin plate 18 between them, the example in FIG. 11...the protrusion 17 of the insulating separator 5 and the deformable portion 19 of the joint plate 4, the example in FIG. Deformable convex part 2
0, Example in Fig. 15... U-shaped piece 23 having a cut-and-raised portion 22 in the center, Example in Fig. 18... Rectangular spring washer 21 with curved longitudinal ends, etc.) may be used only on one side of the bus duct connection part.

As mentioned above, the bus duct connection device of the present invention has a structure in which the connection part cannot be covered unless the fasteners for connecting the conductor and the duct housing are compressed. You can immediately discover if you forgot to tighten a fastener.

Also, by checking the condition of the lid fitting prevention means at the connection part, it can be determined whether the user has forgotten to tighten the fastener or whether the user has neglected to attach the lid even though it has been compressed and tightened.

Furthermore, when tightening the fastener, it is complete by tightening it until the lid fitting prevention means loses its function, so it is possible to tighten to the specified torque with a general tightening tool without using a torque wrench. When installing the cable, it is possible to completely eliminate forgetting to tighten the fasteners at the connection part, which is effective in meeting the current state of the building equipment industry today.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional bus duct connection.
Fig. 2 is an exploded perspective view of an example in which a flexible rectangular plate with an arcuate cross section is used as the lid fitting prevention means, Fig. 3 is a plan view of the temporarily tightened state, and Fig. 4 shows the compressed and tightened state. A plan view, FIG. 5 is a perspective view of a modification of the example shown in FIG. 2, and FIG. 6 is a perspective view of a joint plate in which a cut and raised portion is formed in the duct side joint plate as means for preventing lid fitting.
Fig. 7 is a side view of the bus duct connection using the joint plate, Fig. 8 is a plan view of the temporarily tightened state, and Fig. 9
The figure is an enlarged cross-sectional view of an embodiment in which an insulating separator and a connecting plate are provided with mutually uneven portions and a lid fitting prevention means consisting of an elastic thin plate inserted between them in a temporarily tightened state.
Figure 10 is an enlarged cross-sectional view during compression tightening, Figure 11 is a perspective view of the duct side plate connecting plate that forms the part that is deformed by the protrusion of the insulating separator, and Figure 12 is the cross-sectional view when the connecting plate is used. Fig. 13 is an enlarged cross-sectional view of the bus duct connection in a temporarily tightened state; Fig. 14 is an enlarged cross-sectional view of the bus duct connection in the state of compression tightening; A perspective view of an example in which a deformable convex portion is provided on the plate, FIG. 15 is a plan view of a temporarily tightened state of an example in which the connection portion is narrower than the width of the bus duct main body portion, and FIG. 16 is a side view thereof. , FIG. 17 is a perspective view of a spring washer and a U-shaped piece for preventing lid fitting used in this embodiment, FIG. 18 is a perspective view of a spring washer with a lid fitting prevention function, and FIG. 19 is a perspective view of the spring washer. 20 is a side view thereof, and FIG. 21 is a cross-sectional view of another modification of the example in FIG. 2. D1 and D2 are bus ducts, 1, 2, and 3 are conductors,
4 is a duct side plate joint plate, 5 is an insulating separator,
6 and 7 are fasteners, 8 is a lid, 10 is a backing plate, 11 is a dish-shaped spring washer, 12, 15, 16, 17, 18,
19, 20, 21, 23, and 121 are lid fitting prevention means in each embodiment.

Claims (1)

[Claims] 1 Overlap the ends of conductors of the same phase or butt them together with a backing plate, and insert an insulating separator between the conductors of different phases and between the outermost conductor and the duct side plate joint plate,
In a connection device that forms a connection part by fastening them all together with a fastener, and covers the open surface of the connection part, the connection device is provided with a means for preventing the connection part lid from fitting, and A bus duct connecting device characterized in that it is configured to enable fitting attachment of the lid by disabling the lid fitting prevention function of the means during compression tightening.