JP2000220623A - Fixing structure for nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To retain a nut and to prevent the sudden dropping out thereof by providing, the nut with a nut body part and an insert part integrated thereto to be fitted to the mounting hole of a plate member, and fixing the nut to the plate member by the plastic deformation of the insert part. SOLUTION: A nut 4 has an insert part 6 integrally formed on a hexagonal nut body part 5. The insert part 6, which is non-circular, is divided into a lock part 11 and a plastic part 12, and it constitutes a base 16 integrated to a support part 14 concentric to the lock part 11 and extending within the plastic part 12. The base 16 has a screw bore 9 extending to the vicinity of the upper end of the lock part 11 about the body part 5 and a stepped hole 20 opened on the insert part 6 side and having a continuous diameter extended part 17 larger than the root diameter of the screw bore 6, and a groove-like locking part 21 is formed on the circumferential surface of the support part 14. The insert part 6 is fitted to the mounting hole 3 of a plate member 2, the plastic part 12 is pressed and plastically deformed by a pressing means and bitten into the plate member 2 and the locking part 21 to fix and lock the nut 4 to the plate member 2. According to this, the nut can be easily retained on the plate member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut fixing structure that can easily attach a nut to a plate-like member and can also prevent rotation.

[0002]

2. Description of the Related Art Bolts are generally used to integrally connect a predetermined member to a member to be mounted.
In a case where a beam C is bolted to a steel tube column A or the like in a house via a connection fitting B as illustrated in, for example, when a screw hole is directly formed in the column itself, the column is thin. Because of this, the screw hole depth is small and the bolt fixing strength is inferior. Therefore, it is necessary to arrange a nut or the like inside the column to increase the tightening length of the screw hole.

[0003] However, since the work is performed inside the pillar, it is difficult to perform the positioning work for positioning the nut inside the pillar. Therefore, for example, as shown in FIG. A back plate E provided with a screw hole D is welded to the inner surface, and a bolt F is bolted to the screw hole D.

[0004]

However, in order to keep the screw hole length to a predetermined depth in order to maintain the tightening strength, it is necessary to make the thickness of the back plate E equal to the thickness of the nut. As the weight of E and the weight of column A increase, the installation using such a member is inferior in workability and cost increases.

In FIG. 1, there is a case where, as shown by a dashed line, a metal fitting G for attaching, for example, a large drawing material (not shown) is bolted to a relatively tall web of the beam material C. In such a case as well, manual operation may be required to hold the nut located on the opposite side of the beam C.

Accordingly, the present invention provides a nut fixing structure in which a nut is fixed to a mounting hole of a plate-like member by plastic deformation so that the nut can be held and the nut is prevented from accidentally falling off. The purpose is.

[0007]

In order to achieve the above object, an invention according to claim 1 is a nut fixing structure for fixing a nut to a plate-like member, wherein a mounting hole is formed in the plate-like member. The nut has a nut main body having a screw hole, and an insertion part which is integrated with the nut main body and fitted into the mounting hole, and is fixed to the plate-like member by plastic deformation of the insertion part. It is a nut fixing structure.

Since the nut insertion portion is fixed to the mounting hole by plastic deformation in this manner, the bolt insertion operation can be simplified and the efficiency of the bolting operation can be improved by holding the nut and preventing the nut from falling off.

According to a second aspect of the present invention, since the mounting hole is formed as a non-circular hole and the insertion portion is formed as a non-circular plane for fitting into the mounting hole, the insertion portion engages with the mounting hole to rotate. The nut can be prevented from rotating at the time of bolt tightening, thereby preventing entrainment.

The screw hole may be provided with an enlarged portion which is open on the side of the insertion portion and has a diameter larger than the root diameter of the screw hole. The insertion portion may be plastically deformed. A plastic part for facilitating the operation can be integrally provided.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show one embodiment of the present invention,
The nut fixing structure of the present invention is such that the insertion portion 6 of the nut 4 is fitted into the mounting hole 3 formed in the plate member 2 and is fixed by plastic deformation. In the present embodiment, as shown in FIG. For example, it is used when the connecting fitting B is bolted to a steel pipe column A of a house using a bolt F, and the nut 4 is fixed to the column A which is the plate-shaped member 2 by using the bolt. A screw hole 9 into which the bolt F is screwed can be formed.

The nut 4 is, as shown in detail in FIG.
For example, the insertion portion 6 is integrally formed on one surface of a flat hexagonal nut main body 5, and in this embodiment, the insertion portion 6 has a non-circular shape in a plane concentric with the center of the nut main body 5 in the present embodiment. And

Further, in the present embodiment, the insertion portion 6 is divided in the longitudinal direction into a rotation stopping portion 11 connected to the nut main body 5 and a plastic portion 12, and is inserted into the nut main body 5 and the turning portion. The stopper 11 and the support 14 that is concentric with the rotation stopper 11 and extends inside the plastic part 12 are configured as an integral base 16.

The base 16 has a screw hole 9 extending from the center of the nut body 5 to the vicinity of the upper end of the rotation stopper 11 at the insertion portion 6 side. A stepped hole 20 in which an enlarged diameter portion 17 having an inner diameter d2 larger than the valley diameter d1 is continuously formed. Further, the support portion 14
On the outer peripheral surface, a locking portion 21 formed of, for example, a groove is formed.

The screw length L can be increased by extending the screw hole 9 beyond the nut body 5 to the vicinity of the support portion 14 as described above. Therefore, when the length of the screw hole is made equal to that of the conventional nut, the height of the nut main body 5 can be reduced as compared with a normal nut.

The plastic portion 12 is tightly fitted to the cylindrical support portion 14 by its inner hole, and its outer peripheral surface has the same shape as the insertion portion 6 as described above. But it is almost even. Further, at the corner of the rectangular plane, there is provided an alignment portion 24 formed of, for example, a concave portion.
Is formed.

The base 16 is made of ordinary nut and bolt steel, or a steel material hardened by heat treatment, and the plastic portion 12 is made of a steel material that can be easily plastically deformed as compared to the base 16 or lead, Non-ferrous materials such as copper and aluminum can also be used.

In the case where the insertion portion 6 is made non-circular so as to exert a rotation preventing function by fixing as in this embodiment, the nut main body 5 itself is not often used for the rotation stopping. In addition to a non-circular shape such as a hexagonal shape, a square shape, and a broken circle shape, a circular shape may be used in some cases.

The insertion portion 6 may be formed in a non-circular shape such as a hexagonal shape or a star shape in addition to the square shape so as to be engaged with the mounting hole 3 so as to exhibit the rotation preventing function as described above. When it is used to hold the nut 4 to the plate-shaped member 2 to such an extent that the nut 4 does not need a rotation-preventing function and merely prevents the nut 4 from falling off, the nut 4 may have a flat circular shape.

In this embodiment, as shown in FIG. 3, the non-circular mounting hole 3 into which the insertion portion 6 can be fitted is formed in the plate-shaped member 2 which is the column A at a mounting position. In addition, the mounting hole 3 is formed by inserting the insertion portion 6 of the nut 4 from below.
It can be dimensioned to have a fitting strength of such a degree that it does not fall off when it is lightly inserted. In addition, when inserting from above, and even when inserting from below, it is also possible to use a clearance fit when using an appropriate holding means.

For example, as shown in FIG. 4, when the column A is manufactured, the nut 4 is inserted into the mounting hole 3 formed at a required position of the plate-like member 2 formed by the four surfaces thereof. And fit. In the case of FIG. 4, the nuts 4 are arranged on two facing surfaces, and the upper and lower wedge bases 31,
32 presses the nut body 5 of the nut 4 against the plate-like member 2. Note that the wedge bases 31, 32 can be relatively moved by the cylinder 33 or the like in the length direction via the slope a to increase the height between the upper and lower pressing surfaces 31A, 31B, thereby pressing the nut 4 and The position can be changed by the holding shaft 34.

In this state, the plastic part 12 is pushed down by the positioning part 24 formed of the concave part as shown in FIG. The part 12 is widened and bites into the plate member 2 and at the same time also penetrates into the locking part 21 of the nut 4 so that the plastic part 12 is firmly fixed to the plate member 2 and the base 11 itself. Become.
As a result, the nut 4 can be fixed to the plate member 2 and the nut 4 can be prevented from coming off. Further, the non-circular detent portion 11 of the insertion portion 6
The nut 4 can be prevented from rotating by being locked by the same non-circular mounting hole 3 as the rotation stopping portion 11.

When the plastic part 12 enters the engaging part 21 of the nut 4 and the diameter of the support part 14 is reduced, the stepped hole 20 is also used.
The screwing of the bolt F into the screw hole 9 can be smoothly maintained by the enlarged diameter portion 17.

As a result of such fixing, unless an excessive impact acts, the nut 4 is securely held and prevented from coming off, and the non-circular detent part 11 of the insertion part 6 is attached to the mounting hole 3.
As shown in FIG. 2, when the bolt F is inserted from the member to be attached, which is the connection fitting B, is screwed into the screw hole 9 and the bolt F is tightened, as shown in FIG. 4 can prevent idling and entrainment.

FIGS. 6 to 9 show another embodiment in which the nut 4 is formed of a base member 16 as one member. The base member 16 is formed in a hexagonal nut body 5 by forming the outer peripheral surface thereof into, for example, a square non-circular shape. The inserted portion 6 is formed integrally and concentrically. The base 16 has a screw hole 9 extending the length of the nut body 5.
The screw hole 9 has substantially the same length as the insertion portion 6 and has
A stepped hole 20 is formed by continuously connecting an enlarged diameter portion 17 having an inner diameter d2 larger than the valley diameter d1.
As shown in (1), a peripheral wall having a thicker corner portion is provided.

The nut 4 is inserted into the non-circular mounting hole 3 of the plate member 2 as in the embodiment shown in FIGS.
After insertion, the punch 35 shown in FIG. 5 can be inserted into the corner portion, and the insertion portion 6 can be plastically deformed and cut into the plate-shaped member 2.

As shown in FIG. 9, a taper portion 37 which can be inserted into the enlarged-diameter portion 17 and which can expand and expand the insertion portion 6 by insertion, as shown in FIG. A punch 40 can also be used. By using such a punch 40, it is possible to suppress the reduction of the inner diameter of the enlarged diameter portion 17 while suppressing it. In addition, the expansion of the insertion portion 6 caused by the plastic expansion of the insertion portion 6 causes the nut 4 to bite into the plate member 2 and prevent the nut 4 from falling off, and the insertion portion 6 and the plate member 2 are firmly fixed to prevent rotation. Strength can be improved.

Further, when the nut 4 is fixed as described above, a mold is formed in which both the protrusions of the punch 40 from the bolster 41 for receiving the plate-shaped member 2 are kept at a constant position. , The insertion section 6 can be expanded and deformed and fixed.

As shown in FIG. 10, the diameter of the enlarged portion 17 of the stepped hole 20 of the nut 4 is formed in a square shape along the outer peripheral surface of the insertion portion 6, so that the insertion portion 6 is continuous with the same thickness. It can be formed to have a peripheral wall. At this time, the diameter of the tapered portion 37 is made square and the plate is expanded and fixed to the plate member 2 using a punch in the same manner as in the case of FIG.

FIGS. 11 and 12 show still another example of the nut 4. The nut 4 shown in FIG. 11 has, for example, at least one of four surfaces of an insertion portion 6 having a flat rectangular shape. Each one
Two plastic parts 12 are provided. The plastic portion 12 is formed of a biting ridge that extends from the nut body 5 and terminates near the end face of the insertion portion 6. The end face of the plastic part 12 is formed as an inclined surface 12a inclined downward to increase the thickness to facilitate press-fitting. In this example, the nut main body 5 is formed as a notched circular body.

When the nut 4 is press-fitted into the hole 3 from the insertion portion 6, the plastic portion 12 is plastically deformed and bites into the inner peripheral surface of the plate member 2 so that the nut 4 is prevented from coming off. Further, the insertion portion 6 is tightly fitted in the mounting hole 3 so that the insertion portion 6 is prevented from spinning and cannot be rotated.

The plastic part 12 is the base 16 of the nut 4.
Refers to the part provided to facilitate plastic deformation.
As in the fifth embodiment, the plastic part 12 may be formed separately from the base 16 as a single member as shown in FIGS.

Further, FIG. 12 shows a plastic part 12 having a hexagonal shape of the insertion part 6 and a ridge along each ridge line as shown in FIG.
Is formed. Further, in this example, in order to facilitate the fitting of the nut 4, the plastic part 12 is guided to each corner of the hexagonal mounting hole 3 of the plate-shaped member 2, and the plastic part 12 is easily plastically deformed. The notch 43 is formed, and the rotation preventing function is enhanced by this engagement. Further, the nut 4 can also be prevented from coming off and prevented from rotating with the press-fitting of the nut 4 as in the case of FIG.

When the nut itself needs to be press-fitted and pushed in, the work can be performed in a wide space. For example, as shown by a dashed line in FIG. It can be suitably used for bolting.

As described above, in the nut fixing structure of the present invention, the nut 4 can be deformed into various forms.

[0036]

As described above, according to the first aspect of the present invention, the mounting hole is formed in the plate-like member, and the nut is integrated with the nut main body and is plastically deformed by the insertion portion fitted into the mounting hole. Since the nut is fixed to the member, the fixing operation is easy, the nut can be held on the plate member, and the nut can be prevented from falling off from the plate member.

Further, by making the insertion portion and the mounting hole non-circular and engaging them with each other, it is possible to prevent the nut from rotating around when the bolt is tightened due to idling.

According to the third aspect of the present invention, since the screw hole has the enlarged diameter portion larger than the root diameter of the screw hole concentrically connected to the insertion portion, the insertion portion is plastically deformed at the time of fixing. It is easy to maintain the shape of the screw hole even when the enlarged diameter portion contracts, and it is possible to prevent the workability of screwing in the bolt from being impaired.

Further, according to the fourth aspect of the present invention, since the insertion portion is integrally provided with a plastic portion which is easily plastically deformed, the plastic deformation ensures the fixing to the plate-like member and prevents the insertion and the rotation preventing effect. Can be improved, and a material having relatively large strength can be used except for the plastic part.
Tightening strength with bolts can be secured.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention together with a use state.

FIG. 2 is a cross-sectional view illustrating one embodiment of the present invention.

FIG. 3 is an exploded perspective view thereof.

FIG. 4 is a cross-sectional view illustrating a fixing device.

FIG. 5 is a cross-sectional view illustrating a fixed state.

FIG. 6 is a front view illustrating a nut of another embodiment.

FIG. 7 is a side view thereof.

FIG. 8 is a rear view thereof.

FIG. 9 is a cross-sectional view illustrating a fixed state.

FIG. 10 is a rear view illustrating still another nut.

FIG. 11 is a perspective view illustrating another nut.

FIG. 12 is a perspective view illustrating still another nut and a plate-like member.

FIG. 13 is a cross-sectional view illustrating a conventional structure.

[Explanation of symbols]

 2 Plate-shaped member 3 Mounting hole 4 Nut 5 Nut main body 6 Insertion part 9 Screw hole 11 Detent part 12 Plastic part 14 Support part 16 Base 17 Large diameter part 20 Stepped hole 23 Widening means 35 Punch 40 Punch

Claims (4)

[Claims] 1. A nut fixing structure for fixing a nut to a plate-shaped member, wherein a mounting hole is formed in the plate-shaped member, and the nut is integrated with a nut body having a screw hole. And an insertion portion fitted into the mounting hole, wherein the insertion portion is fixed to the plate-like member by plastic deformation of the insertion portion. 2. The nut fixing structure according to claim 1, wherein said mounting hole is formed as a non-circular hole, and said insertion portion has a plane non-circular shape in which said insertion portion is fitted into said mounting hole. 3. The screw hole according to claim 1, wherein the screw hole is opened on the side of the insertion portion, and an enlarged portion having a diameter larger than a root diameter of the screw hole is provided concentrically. Nut fixing structure. 4. The nut fixing structure according to claim 1, wherein said insertion portion is integrally provided with a plastic portion for facilitating plastic deformation.