JPH0835514A - Nut mounting metal fitting for cylindrical or groove-form hollow member - Google Patents

Abstract

PURPOSE:To reduce the manufacturing cost and the transportation cost of a metal fitting for mounting a nut in the internal surface of a cylindrical or a groove-form hollow member and at the same time to deal with different plate thicknesses by one kind of a metal fitting. CONSTITUTION:A nut 3 is unrotatably mounted on a nut mounting plate 2 comprising a thin metal plate. The nut mounting plate 2 is bent as along the internal surface of a hollow member (A) and inserted into the hollow member (A). An annular projection 6 is formed in the seat surface of the nut 3 and fitted into the bolt insertion hole A1 of the hollow member (A), thereby determining the position of the nut 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular or groove-shaped hollow member having an outer surface on which another member is mounted, as in the case of fastening another structural member to a support made of square pipe in a prefabricated house. The present invention relates to an improvement of a metal fitting for mounting a nut on the inner surface of a hollow member so that the nut cannot fall out and cannot rotate when the bolt and the nut are fastened together.

[0002]

2. Description of the Related Art When fastening other members with bolts and nuts to the outer surface of a hollow member such as a tubular member having a rectangular cross section or a groove member having a C-shaped cross section, generally a hollow member is used. Weld a nut to the inner surface of the hollow member and screw a bolt into it from the outside, or an operator can hold the nut on the inner surface of the hollow member with one hand and screw the bolt with the other hand. However, these methods have a problem that workability is poor.

Therefore, the applicant of the present application has filed an earlier utility model registration application (No. 64-15816, No. 2-71106).
No.), a thin metal plate having elasticity such as a leaf spring is used as a raw material, and a sheet metal working is performed to form a nut mounting plate in a state of being stretched on the inner surface of the hollow member. Among them, a metal fitting was proposed in which a nut was attached to a location corresponding to a bolt insertion hole of a hollow member.

[0004]

In both the prior inventions, the nut can be attached to the inner surface of the hollow member in a non-removable and non-rotatable state, so that the fastening operation with the bolt and the nut can be performed quickly. Have advantages. However, in both the inventions of the prior applications, the nut mounting plate is made of a metal plate having a large elastic force such as a leaf spring and is bent in advance into a predetermined shape. Due to its complicated shape, there is a lot of dead space when stored in a cardboard box, etc.
There was a problem that the transportation cost was high.

An object of the present invention is to provide a metal fitting which solves the problems of the prior applications without impairing the advantages thereof.

[0006]

In order to achieve this object, the metal fitting according to the invention of claim 1 is "formed in a flat plate shape with a thin metal plate so as to be bent along the inner peripheral surface of the hollow member. A nut mounting plate, wherein, in the nut mounting plate, the nut mounting plate is bent into a shape along the inner circumference of the hollow member and inserted into the hollow member at a portion facing the bolt insertion hole, The nut is mounted non-rotatably so that the shaft center is orthogonal to the surface of the nut mounting plate. "

The metal fitting according to a second aspect of the present invention is the metal fitting according to the first aspect, wherein the length of the nut mounting plate is set so as to be substantially in close contact with the inner surface of the hollow member, and the nut is
It is attached to the nut mounting plate with its seating surface in close contact with the surface of the nut mounting plate. " Further claim 3
The metal fitting according to the invention of claim 1,
A configuration is adopted in which "a cylindrical projection that fits into the bolt insertion hole of the hollow member is formed on the seat surface of the nut".

Still further, the metal fitting according to a fourth aspect of the present invention is the metal fitting according to any one of the first to third aspects, wherein "a hole between the adjacent nuts of the nut mounting plate is provided with a hole or the like. To reduce bending strength ”.

[0009]

According to the structure of claim 1, the nut mounting plate is bent into a shape along the inner surface of the hollow member,
Rotate the nut into a state where the bolt can be screwed in by inserting the bent one into the hollow member against its elasticity and aligning the nut so that it is concentric with the bolt insertion hole. It can be installed so that it cannot be removed or cannot be removed.

As described above, since the nut can be mounted inside the hollow member by a simple operation of bending the nut mounting plate and inserting the nut mounting plate into the hollow member, fastening work using bolts and nuts can be performed. It can be done extremely easily. When mounting on a tubular hollow member, the metal fitting is inserted from the opening at one end of the hollow member, while on the other hand, when mounting on a groove-shaped hollow member, the metal fitting is a hollow member. Can be inserted from the end of the hollow member, or can be inserted from the lateral direction at an intermediate portion along the longitudinal direction of the hollow member.

On the other hand, since the nut mounting plate is flat in a state before being mounted on the hollow member, the labor required for processing the nut mounting plate can be remarkably reduced and the overall manufacturing cost can be reduced. In addition, since the metal fittings can be stacked with a small dead space, the cost of storage and transportation can be reduced.

By the way, many hollow members made of steel materials such as square tubes and C-shaped steel have different plate thicknesses even if they have the same outer surface dimensions. Will be different. Therefore, in the case where the nut mounting plate is preliminarily bent and deformed as in the prior application, if the plate thickness is different even if the outer surface size is the same, a plurality of types of metal fittings having different sizes are manufactured according to the difference in the plate thickness. Therefore, there is a problem in that the number of types of metal fittings increases, which increases the manufacturing cost and the labor of management.

In this respect, according to the present invention, when the nut mounting plate is bent, the size of the metal fitting in the bent state can be adjusted to some extent by increasing or decreasing the radius of curvature of the nut mounting material. Therefore, the manufacturing cost can be reduced, and the labor for management can be reduced. Next, according to the structure of claim 2, the nut mounting plate is sandwiched between the seat surface of the nut and the inner surface of the hollow member, and the nut mounting plate serves as a washer for the nut. Even if the hole has a larger diameter than the outer diameter of the bolt, there is an advantage that the fastening strength can be prevented from lowering.

Further, according to the third aspect of the present invention, when the metal fitting is inserted into the hollow member, the nut is concentric with the bolt insertion hole by fitting the tubular projection of the nut into the bolt insertion hole. Since the metal fittings can be positioned in a predetermined posture, the nuts can be surely prevented from shifting when carrying the hollow member having the nuts attached thereto.

Further, according to the structure of claim 4, since the bending strength of the portion of the nut mounting plate between the nuts is small, it is easy to bend the nut mounting plate into a shape along the inner surface of the hollow member. Has the effect that can be done.

[0016]

Embodiments of the present invention will now be described with reference to the drawings. 1 to 5 show a first embodiment applied to a nut mounting bracket for a hollow member A having a rectangular tubular shape. The nut mounting bracket 1 is a band-shaped nut mounting plate 2 and the nut mounting plate. It is composed of four nuts 3 mounted non-rotatably on 2.

The nut mounting plate 2 is made of a thin metal plate such as a thin stainless steel plate (for example, about 0.3 to 0.5 mm) that can be easily bent by a human hand, and its length is The length is set so that the hollow member A can be bent into a rectangular shape so as to be in close contact with the inner peripheral surface thereof. Also,
The nut mounting plate 2 is provided with a mounting hole 4 having a diameter slightly larger than the outer diameter of the bolt B at each portion that overlaps the bolt insertion hole A1 when the nut mounting plate 2 is bent into a rectangular shape and inserted into the hollow member A. On the other hand, as clearly shown in FIG. 2, on the bearing surface of the nut 3, a cylindrical projection 5 that surrounds the female screw is provided.
Is formed, and the projection 3 is inserted into the mounting hole 4 and a part of the projection 5 is caulked (the caulking portion is indicated by reference numeral 5a), so that the nut 3 is fixed to the nut mounting plate 2 so as not to fall off. .

Further, each nut 3 is placed in such a posture that its two parallel side surfaces extend along the longitudinal side edge of the nut mounting plate 2, while the nut 3 is attached to the longitudinal side edge of the nut mounting plate 2.
The nut 3 is held non-rotatable by bending the restriction piece 6 so as to overlap the side surface of the nut 3. The nut mounting plate 2 has notches formed at both ends of the restriction piece 6 so as to facilitate bending of the restriction piece 6.

Further, circular punched holes 8 are formed in each portion of the nut mounting plate 2 between the adjacent nuts 3 to reduce the bending strength of the portion between the nuts 3 to thereby reduce the nut strength. The mounting plate 2 can be easily bent. As shown in FIG. 3, the metal fitting 1 having the above-described structure is formed into a rectangular shape as a whole by bending the portions of the nut mounting plate 2 between the adjacent nuts 3, and then the metal fitting 1 is formed inside the member A. Insert from one end into
The nuts 3 are aligned so that they are located at the bolt insertion holes A1.

Then, since the nuts 3 are urged toward the inner surface of the hollow member 3 by the elastic force of the nut mounting plate 3, the nuts 3 are located at positions concentric with the bolt insertion holes A1. Then, at the same time, the elastic restoring force of the nut mounting plate 2 causes the protrusion 5 to be fitted into the bolt insertion hole A1, and thereby each nut 3 is held concentrically with the bolt insertion hole 3.

Therefore, as shown in FIG. 4, the hollow member A
By screwing bolt B into nut 3 from the outside of
Another member C can be fastened to the outer surface of the hollow member A. Since the nut mounting plate 2 is flat before being attached to the hollow member A, the manufacturing cost can be reduced as compared with the case where the nut mounting plate is preliminarily bent as in the previous application. As shown in FIG. 1 (c), since the stacks can be stacked with the dead space reduced, the cost of storage and transportation can be reduced.

Further, as shown in FIG. 5, even if the dimension L of the outer surface is the same, if the plate thickness t is different, the dimension of the inner surface is different, and the interval between the adjacent nuts 3 is also different. By adjusting the radius of curvature R when the nut mounting plate 2 is bent, the interval between the adjacent nuts 3 can be adjusted to some extent, so there is no need to manufacture a plurality of types of metal fittings 1 according to the difference in plate thickness t. Therefore, an increase in manufacturing cost can be avoided.

In the above embodiment, the four nuts 3 are attached to the single mounting plate 2.
It goes without saying that the number of can be set according to the number of bolt insertion holes A1. The above-described first embodiment was applied to the attachment of the nut to the rectangular tubular hollow member A, but the present invention has a C-shaped cross section as shown as a second embodiment in FIG. It can also be applied to the hollow member A. Further, the present invention can be applied to the attachment of a nut to a hollow member having an L-shaped cross section having an inward lip (the concept of "a hollow member described in the claims includes a member having such a shape"). Is).

FIG. 7 shows a third embodiment. In this embodiment, the top surface of the nut 3 is attached to the nut mounting plate 2 to make the nut mounting plate 2 similar to the hollow member 2. By bending, the seating surface of each nut 3 is brought into contact with the inner surface of the hollow member A. The part where the nut 3 is attached to the nut mounting plate 2 is not limited to the seat surface or the top surface,
The mid-height portion of the nut 3 may be attached to the nut attachment plate 2.

FIG. 8 shows a fourth embodiment, (a) is a partially cutaway side view, and (b) is a sectional view taken along line bb of (a). In this embodiment, an annular groove 9 is formed in a cylindrical projection 5 protruding from the seat surface of the nut 3, and the inner peripheral edge 2a of the nut mounting plate 2 is locked in this. Further, the inner peripheral edge 2a of the nut mounting plate 2 is circumferentially divided by the notch 10 so that the nut 3 can be easily mounted.

According to the structure of the fourth embodiment, the nut 3
Is convenient because it can be installed on site. Figure 9
5 shows a fifth embodiment in which the nuts 3 are mounted on the nut mounting plate 2 in such a posture that the side surfaces of the adjacent nuts 3 extend parallel to each other. In this embodiment, two restriction pieces 6 are provided on each of both longitudinal side edges of the nut mounting plate 2.

With the structure shown in FIG. 9, compared with the case where the nut 3 is mounted in the posture as in the first embodiment, for example,
Even if the axial distance between the adjacent nuts 3 is the same, the distance between the side surfaces of the adjacent nuts 3 can be increased, so that the nut 3 and the nut 3 interfere with each other when the nut mounting plate 2 is bent. There is an advantage that the nut mounting plate 2 can be easily bent and inserted into the hollow member A by preventing the above.

Although the hexagonal nut is used in the above embodiment, the nut may have other shapes such as a square shape, and the shape and size of the nut mounting plate 2 can be set arbitrarily. Further, the means for non-rotatably and non-fallingly attaching the nut to the nut attaching plate may be other means such as welding.

[Brief description of drawings]

1A is a perspective view of a metal fitting, FIG. 1B is a partial perspective view of the metal fitting when turned over, and FIG. 1C is a front view of the metal fitting stacked.

FIG. 2A is a partial bottom view of the metal fitting, and FIG. 2B is a sectional view taken along the line bb of FIG.

FIG. 3 is a diagram showing a method of use.

FIG. 4 is a diagram showing a usage state.

FIG. 5A is a diagram when attached to a hollow member having a large plate thickness, and FIG. 5B is a diagram when attached to a hollow member having a thin plate thickness.

FIG. 6 is a diagram showing a second embodiment.

FIG. 7 is a diagram showing a third embodiment.

8A and 8B are views showing a fourth embodiment, in which FIG. 8A is a partially cutaway front view, and FIG. 8B is a sectional view taken along line bb of FIG. 8A.

FIG. 9 is a diagram showing a fifth embodiment.

[Explanation of symbols]

 A Hollow member A1 Bolt insertion hole B Bolt 1 Nut mounting bracket 2 Nut mounting plate 3 Nut 4 Mounting hole 5 Protrusion 6 Control piece 8 Drain hole

Claims (4)

[Claims] 1. A nut, into which a bolt inserted from the outside of the hollow member is screwed, is attached to a position of a bolt insertion hole formed in the hollow member of the inner surface of the hollow member of the tubular or grooved member. And a nut mounting plate formed of a thin metal plate in a flat plate shape so as to be bent along the inner peripheral surface of the hollow member. Among them, the nut is attached to a portion facing the bolt insertion hole in a state where the nut mounting plate is bent into a shape along the inner circumference of the hollow member and inserted into the hollow member, and the shaft center is the surface of the nut mounting plate. A nut mounting metal fitting for a hollow member such as a tubular shape or a groove shape, which is non-rotatably mounted so as to be orthogonal to each other. 2. The nut mounting plate according to claim 1, wherein the nut mounting plate is set to a length such that the nut mounting plate is in close contact with the inner surface of the hollow member, and the nut has a bearing surface in close contact with the surface of the nut mounting plate. A nut mounting bracket for a hollow member such as a tubular shape or a groove shape, which is mounted on the nut mounting plate in the above state. [Claim 3] In claim 1 or claim 2,
A nut mounting fitting for a hollow member such as a tubular member or a groove member, characterized in that a tubular protrusion that fits into a bolt insertion hole of the hollow member is formed on a seat surface of the nut. 4. The bending strength according to any one of claims 1 to 3, wherein a portion of the nut mounting plate between adjacent nuts is provided with a hole to reduce bending strength. A nut mounting bracket for a hollow member such as a cylinder or a groove.