JP3604763B2 - Connection structure - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a connecting structure for connecting the coupling plate and the connecting plate by fixing bolts and nuts.
[0002]
[Prior art]
In recent years, low-voltage wiring systems have been frequently laid underground. Therefore, recently, a rectangular parallelepiped-shaped handhole is arranged between the conduits where the trunk cable is drawn in and laid, and the low-pressure branching device is stored in the handhole and buried underground. .
[0003]
FIG. 2 is a front view of the three-phase four-wire type low-voltage branching device, and reference numeral 1 denotes a trunk cable connection part. The trunk cable connection portion 1 is set up as a pair, and has a tubular waterproof cover 3 into which the terminal of the trunk cable 2 is introduced. The upper end of the trunk cable 2 is fixed by a cleat 4, and the cleat 4 is fixedly supported by a support 5. A fixed plate 6 is attached to the upper end of the support 5, and a T-shaped branch 7 is disposed on the fixed plate 6. The branch body 7 is provided with a trunk line connecting body 8 and a branch cable connecting portion 9.
[0004]
FIG. 3 shows a connection structure between the trunk cable 2 and the branch body 7, and FIG. 4 is an exploded view of the same structure. In these figures, reference numeral 10 denotes a low-voltage current-limiting fuse. The low-voltage current limiting fuse 10 includes a fuse body 11 and E-shaped terminal plates 12 and 12 attached to both ends of the fuse body 11. In the fuse body 11, a fusible material such as silver is stored in an insulating cap, and arc-extinguishing sand is provided between the fusible material and the cap.
[0005]
In the low-voltage current-limiting fuse having such a structure, a compression terminal 13 that is compressed and fixed to the cable conductor 2A of the trunk cable 2 is fixed to the lower terminal plate 12. Compression pin 13 has to be connected conductive plate 14, the the coupled conductor plate 14 brought into surface contact with the terminal plate 12, through the fixing bolts 15 are engageably inserted in the recess 12a of the terminal plate 12 to be coupled conductive plate 14 The nut 17 is screwed into the hole 14 a through the spring washer 16 and the flat washer 19, thereby being connected to the terminal plate 12. An unconnected conductor plate 18 on the branch body 7 side is similarly connected to the upper terminal plate 12 via a fixing bolt 15, a spring washer 16, a flat washer 19, and a nut 17.
[0006]
[Problems to be solved by the invention]
By the way, when replacing the fuse due to blowing of the low-pressure current-limiting fuse 10 or the like, it is necessary to loosen the nut 17 and tighten the nut 17 after the replacement.
However, in the above-described conventional connection structure, when the nut 17 is loosened or tightened, the bolt head of the fixing bolt 15 needs to be fixed in advance with a monkey spanner or the like in order to prevent the fixing bolt 15 from rotating together.
When the nut 17 is loosened and the terminal plate 12 is engaged with the fixing bolt 15, it is necessary to move the spring washer 16 and the flat washer 19 toward the nut 17 in order to secure this engagement interval.
For this reason, the conventional connection structure requires a lot of labor and time for the connection work, and there is a problem in workability.
[0007]
On the other hand, the nut 17 is removed from the fixing bolt 15 and the spring washer 16 and the flat washer 19 are also removed from the fixing bolt 15 in order to easily perform the work of engaging the terminal plate 12. However, when the nut 17, the spring washer 16, and the flat washer 19 are removed as described above, there is a possibility that these components may be lost.
[0008]
The present invention has been made to solve such a problem, and an object of the present invention is to provide a connection structure that does not lose parts and has excellent workability.
[0009]
[Means for Solving the Problems]
The present invention is passed through the fixing bolt into the bolt through-hole of the connecting plate, this fixing bolt engaging the connecting plate, and the connecting structure for screwing the nut, angular fixing bolts attached to the connecting plate Anti-rotation part for holding the head of the bolt in a non-rotatable manner, a disengagement prevention part protruding from the tip of the screw part of the fixing bolt to prevent the nut from coming off, and being interposed between the nut and the connecting plate. A guide washer that is bent in a direction away from the plate surface of the washer body and the connected plate, and has a bent portion that guides the connecting plate to an engagement position between the washer body and the connected plate. ,
Comprise a non-threaded portion having a length dimension of the combined respective thickness thereof so as to position the connecting plate, the connecting plate and the guide washers disposed between the angular bolt head and the threaded portion of the fixing bolt It is characterized by.
[0010]
[Action]
Since the rotation preventing portion prevents rotation of the square bolt head, the nut can be loosened and tightened without rotating the fixing bolt.
On the other hand, even if the nut is loosened, the nut is prevented from being detached from the fixing bolt by the detachment prevention part, so that the nut and the guide washer can be prevented from being lost.
On the other hand, even if the nuts and the like are not removed, the connecting plate engages with the fixing bolt while moving the guide washer on the fixing bolt through the bent portion of the guide washer, and the guide washer is mounted on the non-threaded portion of the fixing bolt. , The movement is smooth.
[0011]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an embodiment in which the connection structure according to the present invention is applied to the connection between a trunk cable and a branch body of a low-voltage branching device. FIG. 1A is a front view, and FIG. 1B is a side view. is there.
First, the low-pressure current-limiting fuse 10 includes a fuse body 11 and E-shaped terminal plates 12 and 12 attached to both ends of the fuse body 11. These terminal plates 12, 12 form a connecting plate, and have engaging recesses 12a, 12a, respectively (see FIG. 4).
[0012]
Next, and extension the coupled conductor plate 14 from the compression pin which is fixed to the conductor of the trunk cable 2 (see FIG. 2). Bolt through holes 14a penetrating in the thickness direction, 14a is provided in the the connected conductor plate 14.
A fixing bolt 20 is penetrated through each bolt through hole 14a. Each fixing bolt 20 has a hexagonal bolt head 21, and an anti-rotation body 22 is attached to these bolt heads 21. Anti-rotation member 22 is in surface contact with the opposing surfaces of the bolt head 21 is U-shaped cross section, and is fixed to the connecting conductor plate 14 via the set screw 23. Therefore, since the bolt head 22 is held in a state of being sandwiched by the rotation preventing body 22, the rotation of the fixing bolt 20 is prevented.
[0013]
A screw portion 24 is provided in a substantially half portion of the fixing bolt 20 on the tip side. A retaining ring 25 is provided at the tip of the screw portion 24. Therefore, even if the nut 17 screwed into the screw portion 24 is loosened, the nut 17 hits the retaining ring and its rotation is restricted, so that the nut 17 does not come off from the screw portion 24.
A spring washer 16 and a guide washer 26 are disposed between the nut 17 and one terminal plate 12 engaged with the fixing bolt 20. Guide washer 26 is a pair of fixing bolts 20, 20 are through-formed in a rectangular shape, the bent portions 26a which are bent in the direction away from the plate surface of the connecting conductor plate 14 at both ends, 26a is formed I have.
[0014]
A non-threaded portion 27 composed of a shaft portion is formed between the bolt head 21 of the fixing bolt 20 and the threaded portion 24. The non-threaded portion 27 is set to the connection conductor plate 14, the terminal plate 12, the length L of the sum of the thickness of the spring washer 16 and the guide washer 26. Therefore, the guide washer 26 and the like can be smoothly moved on the non-threaded portion 27.
Since the object to be coupled conductive plate 18 extending from the branch body is exactly as connected to the other terminal plate 12, the same parts and their description is omitted with the same reference numerals.
[0015]
In the connection structure having the above configuration, the rotation of the bolt head 21 of the fixing bolt 20 is prevented by the rotation preventing body 22, so that even when the nut 17 is loosened or tightened, the fixing bolt 20 does not rotate together. .
When the nut 17 is loosened, the nut 17 hits the retaining ring 25 and its rotation is restricted, so that the nut 17 does not come off from the screw portion 24.
[0016]
On the other hand, when the terminal plate 12 is lifted in the width direction to replace the low-voltage current-limiting fuse 10 and the engagement with the fixing bolt 20 is released, the guide washer 26 and the spring washer 16 move on the non-threaded portion 27 and are covered. It approaches or contacts the connecting conductor plate 14 side. In this state, when pushing the terminal plate 12 of the low-pressure limiting fuse 10 has been replaced between the guide washer 26 in the width direction and the connecting conductor plate 14, so to press the bent portion 26a of the guide washer 26, the guide washer 26 and spring washer 16 moves away from the connecting conductor plate 14 on the non-threaded portion 27. Therefore, the terminal plate 12 can be engaged with the fixing bolt 20 without lifting the guide washer 26 and the like. In this case, since the guide washer 26 and the like are located on the non-threaded portion 27, the movement of the guide washer 26 and the like are smooth.
[0017]
In the above embodiment, the present invention is applied to the main cable connecting portion of the low-voltage branching device, but the present invention can also be applied to the connecting portions of other electric devices and the connecting portions of general mechanical parts.
It should be noted that a projection-like member may be attached instead of the retaining ring 25, that is, any shape may be used as long as the nut 17 can be prevented from coming off the screw portion 24.
When the length L of the non-threaded portion 27 is increased, the screwing of the nut 17 to the threaded portion 24 becomes incomplete, and when the length is reduced, the spring washer 16 and the like are located on the threaded portion 24, so that the movement is smooth. Sex is impaired.
[0018]
【The invention's effect】
As described above, according to the present invention, the rotation of the bolt head is prevented from rotating together with the fixing bolt when the nut is loosened by the rotation preventing portion, and the bent portion provided on the guide washer on the non-threaded portion is provided. The guide washer is moved by the connecting plate through the connector plate and engaged with the fixing bolt, and the nut is prevented from coming off from the fixing bolt by the screw part prevention part, so work such as nuts is not lost. It is possible to provide a connection structure capable of performing connection and release operations with good efficiency.
[Brief description of the drawings]
FIG. 1A is a front view showing a cross section of a part of a connection structure according to the present invention, and FIG. 1B is a side view of the connection structure.
FIG. 2 is a front view of the low-pressure branching device.
FIG. 3 is a cross-sectional view showing a conventional connection structure of a trunk cable connection portion.
FIG. 4 is an exploded view of a conventional connection structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Low voltage current limiting fuse 12 Terminal board 12a Engagement recessed part 14, 18 Non-connection conductor board 20 Fixing bolt 21 Bolt head 22 Anti-rotation body 24 Screw part 25 Retaining ring 26 Guide washer 26a Bent part 27 Non-thread part

Claims (1)

And the connecting plate having a bolt through hole penetrating in the thickness direction, and fixing bolts engaging the are in angular bolt head penetrates the bolt through hole in the object to be connecting plate, engaged to be engaged with the fixing bolt a connecting plate having engagement recesses, the connection structure and a nut that said screwed into the screw portion of the fastening bolt fastened to each other the connecting plate and the object to be connecting plate,
The anti-rotation portion for holding mounted to the connecting plate non-rotatably to the angle-shaped bolt head,
A disengagement prevention portion that is provided in the radial direction on the distal end side of the screw portion, and prevents the nut from being detached from the screw portion.
Position of engagement between the washer body and the interposed said connecting plate is bent in the direction away from the plate surface of the connecting plate and the washer body said the target connection plate between the coupling plate and the nut A guide washer having a bent portion for guiding to
Wherein said angle-shaped bolt head of the fixing bolt and disposed between the threaded portion, the is set to the length dimension of the combined respective thickness thereof so as to position the connecting plate and the guide washers and the connecting plate And a non-threaded portion.

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