JPH0777214A - Bolt-fastening structure between structure - Google Patents

Abstract

PURPOSE:To fix a nut seated in a groove to prevent the nut from slipping off without using an adhesive material or a fixing O-ring in a bolt-fastening structure for fastening structures with each other. CONSTITUTION:A nut 10 is seated in a lateral groove 4b of an insulating frame 1 as a structure in contact with the groove bottom in order for the nut to be screwed on a screw of the body part of a bolt 6 which is passed through a bolt hole 7 of a supporting body 3 as a structure to be inserted into a vertical groove 4a. Then, a presser plate 11 made of a rectangular elastic plate made slightly larger than the groove width of the lateral groove 4b is inserted into the lateral groove 4b to be deformed and deflected to produce spring-inertia in itself. The presser plate 11, in which spring-inertia is produced, is pressed against the side face of the seated nut 10 to prevent the nut 10 from falling off and to fix the nut.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolting structure between structures, for example, an insulating frame for housing a vacuum circuit breaker and a support for supporting the insulating frame.

[0002]

2. Description of the Related Art Structures, for example, an insulating frame of a vacuum circuit breaker and a supporting body supporting the insulating frame are fastened together by bolts.
The related art will be described below with reference to the drawings. FIG. 11 is a side view showing a structure for bolting an insulating frame of a vacuum circuit breaker and its support. An insulating frame 1 for housing a vacuum circuit breaker is fixed to a front panel 2 of a switchboard. In order to support the right side of the insulating frame 1, an L-shaped support body 3 is bridged from a side panel (not shown) of the switchboard (in front of and behind the paper surface), and the insulation frame 1 is bolted to the support body 3.

FIG. 12 is an enlarged sectional view of a portion A of FIG.
12, the groove 4 is provided leftward from the end surface 1a of the insulating frame 1, and the shape of the groove 4 is provided in a cross shape as shown in FIG. 13 which is a side view of the arrow B of FIG. . Here, the vertical groove 4a of the groove 4 is formed on the adjacent end surfaces 1a of the insulating frame 1 and
The groove width is such that the body portion of the bolt 6 can be inserted and the groove width is such that it can be inserted. On the other hand, the lateral width 4b of the groove 4 is the vertical groove 4a.
The nut 5 is provided to have a groove width that is open to the end surface 1a of the insulating frame 1 and that can be inserted over the vertical groove 4a and that can prevent rotation. The insulating frame 1 having the cross-shaped groove 4 is manufactured by die molding.

A bolt hole 7 is provided in the support 3. With such a configuration, the nut 5 is seated in the lateral groove 4b while straddling the vertical groove 4a. At this time, in order to fit the bolt 6 into the thread portion of the nut 5, the nut is held on the seat portion with an adhesive and seated. And the insulating frame 1 and the support 3
Then, the bolt 6 is passed through the bolt hole 7 of the support 3 through the washer 8 and then screwed into the nut 5 through the vertical groove 4a of the insulating frame 1. At the time of this screwing, the side surface of the polygonal nut 5 abuts against the inner wall of the lateral groove 4b and cannot rotate, so that the bolt can be tightened.

The above-described bolt tightening structure is not limited to the bolt tightening of the insulating frame 1 and the support body 3, but can be generally adopted in the case of a bolt tightening structure between structures. In addition, the applicant of the present application has proposed a bolting structure for other structures in Japanese Patent Application No. 4-117801. In this proposal, the insulating frame and the support of the above-described conventional example are taken as an example of the structure, and only the nut structure for bolting is provided with the O-ring. Therefore, the structure is proposed with reference to FIG. 13 of the conventional example. Will be briefly described.

The nut shown in FIG. 13 is formed by providing a cylindrical portion having a thread and a polygonal flange projecting from the cylindrical portion. An O-ring is fitted around the cylindrical portion of the nut and the outside of the O-ring is fitted. At least part of the diameter projects from the flange. By inserting a nut into which the O-ring is fitted into the lateral groove 4b, the O-ring is fitted into the lateral groove 4b.
The position of the nut is fixed by being compressed by the inner wall of the.

In addition to the above, nuts for fitting O-rings may be formed such that flanges are provided at both ends of the cylindrical portion, and the O-rings may be fitted between the flanges. The position of the nut can be fixed by compressing. Therefore, the bolt 6 is passed through the washer 8 into the bolt hole 7 and the lateral groove 4b.
The insulating frame 1 and the support body 3 are bolted by the bolt 6 by screwing the bolt 6 into the nut fixed to the.

[0008]

As in the conventional example, the nut is held in advance in the lateral groove of the insulating frame with the adhesive because the adhesive adheres to the threaded portion of the nut and the force required for screwing the bolt is not applied. There is a problem that it becomes large and the bolt does not fit in the nut. Also, when you tighten the bolts,
Rotational force is applied to the nut and the nut rotates a little, so
The adhesive comes off. Therefore, there is a problem that the nut will fall off when the bolt is unfastened.

In Japanese Patent Application No. 4-117801, the problem of using the above-mentioned adhesive is solved and the position of the nut is fixed by an O-ring fitted in the nut without using the adhesive. In order to hold the ring, it is necessary to provide the nut with a cylindrical portion into which the O-ring is fitted, an annular groove into which the O-ring is fitted, and the like, which causes a problem in cost or marketability of the nut.

An object of the present invention is to prevent a nut seated in the second groove of the first structure from falling off without using an adhesive or an O-ring when bolting the structures together. The purpose of the present invention is to provide a structure for bolting structures that can be fixed to each other.

[0011]

In order to solve the above-mentioned problems, according to the present invention, there is provided a first groove having a groove width into which a body portion of a bolt can be inserted and which is provided so as to be open over both adjacent surfaces. A first groove that is orthogonal to the first groove and has a groove width that opens on one surface of the two adjacent surfaces to prevent rotation of the polygonal nut, and that allows the nut to be inserted over the first groove. The first structure provided with the second groove and the second structure having the bolt hole are aligned, the nut is seated in the second groove over the first groove, and the bolt is attached to the second structure. In the bolt-tightening structure for bolting the structural bodies to each other by screwing the nuts into the bolt holes, the nuts are seated in contact with the groove bottoms of the second grooves in the second groove. Presser that can be inserted and consists of a rectangular elastic plate that is slightly larger than the size of the second groove. Was inserted into the second grooves, it is assumed pressed against the side surface of the seated nut.

Further, in the above-described bolt-tightening structure of the structures, the pressing plate made of the elastic plate is made convex instead of being square, and the convex base can be inserted into the second groove. The size of the groove is slightly larger than that of the groove, and the protrusion protruding from the convex base can be inserted into the first groove portion in which the end of the body of the bolt screwed into the nut is housed. It should be slightly larger than the part.

The holding plate made of the elastic plate is made of plastic or metal.

[0014]

When the first structure and the second structure are bolted together, the first structure is opened over both adjacent surfaces of the first structure,
A nut having a polygonal shape in which a nut is straddled over the first groove in a second groove provided orthogonally to the first groove having a groove width into which the body portion of the bolt can be inserted and which is in contact with the groove bottom of the second groove. Is seated, the bolt is passed through the bolt hole of the second structure, and then the structure is bolted by screwing it into the nut. In this case, since the second groove has a groove width that prevents the polygonal nut from rotating, the bolt is screwed into the nut by rotating the bolt.

At this time, before the bolt is tightened, the second
By inserting a holding plate made of a plastic or metal elastic plate having a rectangular shape slightly larger than the size of the second groove into the second groove on the side surface of the nut seated in contact with the groove bottom of the groove, The retainer plate is deformed and bends to generate spring properties.By pressing the retainer plate having this spring property against the side surface of the nut, the spring property of the retainer plate prevents the nut from slipping out toward you, and prevents the nut from falling off. It can be prevented and fixed.

Further, the pressing plate made of an elastic plate is formed into a convex shape which can be inserted into the second groove and the first groove orthogonal thereto, and the convex base can be inserted into the second groove. The projection, which is slightly larger than the groove size and protrudes from the convex base, can be inserted into the first groove portion in which the end of the body of the bolt screwed into the nut is housed. A little larger than the size of the part. Then, by inserting the convex holding plate over the first groove and the second groove, the convex holding plate is deformed in the vertical and horizontal directions to be bent, and springiness is generated. Therefore,
By pressing the pressing plate having such a spring property against the side surface of the nut, the spring property of the pressing plate can prevent the nut from falling off and fix the nut.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a bolting structure of an insulating frame as a structural body and its support according to an embodiment of the present invention,
FIG. 2 is a side view taken along the arrow C in FIG. In addition, in FIGS. 1 and 2 and FIGS.
The same parts as those of the conventional example 3 are denoted by the same reference numerals, and the description thereof will be omitted. 1 and 2 is different from the conventional example in that a square nut 10 is inserted into the lateral groove 4b of the insulating frame 1 before bolting and the nut 10 is straddled over the vertical groove 4a.
After the side surface of the nut 10 is in contact with the groove bottom of the lateral groove 4b and seated in the lateral groove 4b, a rectangular holding plate made of a plastic or metal elastic plate shown in FIGS. 3 and 4 which is a side view of FIG. 11 is inserted into the lateral groove 4b and pressed against the side surface of the nut 10.

Here, the holding plate 11 is slightly larger than the width D of the lateral groove 4b (see FIG. 5) by α (α is about 0.5 mm). By inserting the holding plate 11 into the lateral groove 4b, the holding plate 11 is deformed and bent to have a spring property. Therefore, the pressing plate 11 having this spring property is generated.
By pressing against the side surface of the nut 10 as shown in FIG. 5, the nut 10 can be fixed while preventing the nut 10 from falling off from the lateral groove 4b.

FIG. 6 is a sectional view of a bolting structure of an insulating frame as a structural body and a supporting body thereof according to another embodiment of the present invention, and FIG. 7 is a side view taken along arrow G in FIG. 6 and 7
9 is a side view of the holding plate 13 in FIG. 8 and FIG.
As shown in FIG. 3, the width of the base portion 13a inserted into the convex lateral groove 4b is D + α which is the same as that in FIG.
3b is made slightly larger than the dimension of the vertical groove 4a in which the end of the body of the bolt 6 protruding from the nut 10 is housed. Here, the convex height is a seating surface on which the nut 10 is seated in the lateral groove 4b. The bottom surface 4 of the vertical groove 4a facing the seating surface
It is slightly larger than the distance to d (this distance is E) by α (α is about 0.5 mm), and the holding plate 13 is inserted over the lateral groove 4b and the vertical groove 4a and pressed against the nut 10. Other than the above, it is the same as that of FIGS.

Such a holding plate 13 is inserted into the groove 4, that is, the base portion 13a is a lateral groove 4b and the protrusion 13b is a vertical groove 4a.
And then presses against the side surface of the seated nut 10 in contact with the bottom of the lateral groove 4b as described above. In this case, presser plate 1
By inserting 3 into the horizontal groove 4b and the vertical groove 4a, the spring 3 is deformed in the horizontal and vertical directions as shown in FIG. 6 and FIG.
The nut 10 is fixed by being pressed against the side surface of the nut 10. Since the holding plate 13 is deformed vertically and horizontally and bends, the nut is prevented from coming off securely, and when the holding plate 13 is inserted with a finger, it can be easily pushed with a finger.

Although the nut has a quadrangular shape in the above-mentioned embodiments, it may have a hexagonal shape.

[0022]

As is apparent from the above description, according to the present invention, with the above-described structure, the second groove of the first structure straddles the first groove and the groove bottom of the second groove is formed. A plastic or metal rectangular holding plate inserted into the second groove to cause springiness in a nut seated in contact with the spring, or springiness inserted into the first and second grooves. By pressing the plastic- or metal-made convex holding plate that causes the nut, the nut is pressed by the holding plate having spring property to prevent the nut from coming off, and preventing the nut from falling out from the second groove. Can be fixed.

Since a commercially available nut can be used, the cost can be reduced, and the pressing plate can be manufactured by molding or pressing, so that the cost can be the same as that of the O-ring. Further, since the pressing plate can be inserted into the groove only by pushing with a finger, the work is simplified and the nut can be securely fixed.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a structure for bolting an insulating frame of a vacuum circuit breaker and its support according to an embodiment of the present invention.

FIG. 2 is a side view taken along the arrow C in FIG.

FIG. 3 is a plan view of the holding plate of FIG.

FIG. 4 is a side view of the holding plate of FIG.

5 is a sectional view taken along line FF of FIG.

FIG. 6 is a partial cross-sectional view of a bolting structure of an insulating frame of a vacuum circuit breaker and its support according to another embodiment of the present invention.

FIG. 7 is a side view taken along the arrow G in FIG.

FIG. 8 is a plan view of the holding plate of FIG.

9 is a side view of the holding plate of FIG.

10 is a partial cross-sectional view taken along line HH of FIG.

FIG. 11 is a side view showing a conventional bolting structure for an insulating frame of a vacuum circuit breaker and its support.

FIG. 12 is an enlarged sectional view of part A in FIG.

FIG. 13 is a side view taken along the arrow B in FIG.

[Explanation of symbols]

 1 Insulation Frame 3 Support 4 Groove 4a Vertical Groove 4b Horizontal Groove 5 Nut 6 Bolt 7 Bolt Hole 10 Nut 11 Holding Plate 13 Holding Plate

Claims (3)

[Claims] 1. A first groove having a groove width into which a body portion of a bolt can be inserted and opened across both adjacent surfaces, and one of the adjacent surfaces orthogonal to the first groove. A second opening that is open in the surface and has a groove width that can prevent rotation of the polygonal nut, and that allows the nut to be inserted across the first groove.
First structure provided with a groove and a second structure having a bolt hole
After the nut is seated in the second groove over the first groove and the bolt is passed through the bolt hole of the second structure, the nut is screwed into the nut to attach the structures to each other. In a bolted structure between bolted structures, the nut can be seated in contact with the groove bottom of the second groove and inserted into the second groove, and a rectangular elastic shape slightly larger than the dimension of the second groove can be inserted. A structure for bolting a structure to each other, wherein a holding plate made of a plate is inserted into the second groove and pressed against the side surface of the seated nut. 2. The pressing plate as claimed in claim 1, wherein the holding plate made of an elastic plate has a convex shape instead of the rectangular shape, and the convex base portion can be inserted into the second groove, and the dimension of the second groove can be set. The protrusion, which is slightly larger and protrudes from the base, can be inserted into the first groove portion in which the end portion of the body portion of the bolt screwed into the nut is housed, and is slightly larger than the dimension of this groove portion. The bolt-tightening structure between the structures that is characterized. 3. The structure according to claim 1 or 2, wherein the holding plate made of an elastic plate is made of plastic or metal, and the structure is bolted together.