JP2001193877A - Tube fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sove the problem of metal barlike nut and washer that the diameter is increased according to the enlargement of the outer diameter of a tube to connect and a tube fitting, resulting in the increase in weight and cost and the deterioration of workability. SOLUTION: In this tube fitting, a bolt fastening part is constituted so as to have a metal pipe like washer on one of both the opposed ends and a metal pipelike nut on the other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for connecting pipe-to-pipe butt portions.

[0002]

2. Description of the Related Art While maintaining a fixed pipe-to-pipe spacing at one of the conventional pipe joints, a bolt fastening portion is provided at a discontinuous portion of a cylindrical housing whose one end in the circumferential direction is discontinuous. There is a pipe joint that holds and connects a pipe by tightening a fastening portion.

[0003] Pipe fittings of this kind are described, for example, in German Patent No. 2
No. 428107, Japanese Patent Publication No. 55-25316,
JP-B-57-50994, JP-B-2-53669
As described in the above publication, there is a practically satisfactory connection between opposed tubes.

[0004]

However, pipe joints also have the following problems.

A pipe joint of this type has a bolt fastening portion at a discontinuous portion of a cylindrical housing E having one end in the circumferential direction discontinuous as shown in FIG. And a bolt fastening portion is composed of a metal round bar-shaped nut A, a round bar-shaped washer F, and a tightening band C.

[0006] The metal round bar-shaped nut and the metal round bar-shaped washer increase in outer diameter of the pipe to be connected and the diameter of the pipe joint at the same time as the pipe joint becomes larger. In addition, when an expensive material such as stainless steel is used, it leads to an increase in cost and causes a deviation from market requirements.

[0007]

The present invention is to solve such a problem as follows.

First, basically, one end in the circumferential direction has a bolt fastening portion at a discontinuous portion of a cylindrical housing that is discontinuous, and a sealing sleeve for a pipe to be connected inside is provided. The bolted joint has a metal pipe-shaped washer on one of opposite ends of the tightening band and a metal pipe-shaped nut on the other.

More specifically, the metal pipe-shaped nut is provided with a hexagonal or square nut at a fixing position where the distance between the opposite sides of the hexagonal or square nut in the metal pipe having an inner diameter smaller than the distance between the opposite sides of the hexagonal or square nut is secured. Alternatively, a square nut is sealed so that the screw hole direction of the nut is perpendicular to the axial direction of the metal pipe, and a bolt insertion hole communicating with the screw hole of the hexagonal or square nut is formed in the metal pipe. A certain above-described pipe joint is provided.

Further, the fixing position where the distance between the sides of the metal pipe opposite to the hexagonal or square nuts is ensured is to reduce the thickness of the pipe plate or reduce the outer diameter so that the inner diameter of the metal pipe at the fixing position is larger than the other inner diameter. The present invention provides the above-described pipe joint which is expanded in a direction to form a metal pipe-shaped nut.

[0011]

Next, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show an embodiment of a pipe joint according to the present invention, and are a front view and a side view, respectively.

This pipe joint has a bolt fastening portion at a discontinuous portion of a cylindrical housing 11 whose one end in the circumferential direction is discontinuous, and a sealing rubber sleeve 12 for a pipe to be connected inside. Have.

In the bolt fastening portion, a metal pipe-shaped washer 13 is inserted into one of the folded portions 15a of the folded portions at the opposite ends of the tightening band 15, and a nut 2 is sealed in the metal pipe 1 into the other folded portion 15b. A metal pipe-shaped nut 14 is inserted, and a bolt 16 is inserted through a bolt insertion hole formed in the metal pipe-shaped washer 13 and a bolt insertion hole formed in the metal pipe-shaped nut 14. . In this embodiment, a metal pipe-shaped nut in which a hexagonal or square nut is sealed in a metal pipe is used.

The metal pipe-shaped nut enclosing a hexagonal or square nut has the following structure.

FIG. 3 is a perspective view showing an embodiment of a metal pipe-shaped nut used in the pipe joint according to the present invention, FIG. 4 is a front view thereof, and FIG. 5 is a sectional view taken along line AA of FIG. . In the figure, 1 is a metal pipe, and 2 is a hexagon nut.

The metal pipe 1 has an inner diameter 1a having a diameter smaller than the distance 2c between the opposed sides 2a and 2b of the hex nut 2, and the opposed sides 2a and
A fixing position where a distance 2c of 2b is secured is formed. Here, the fixing position is formed such that the pipe thickness 1b at that location is thin so that the inner diameter of the metal pipe at the fixing position is larger than the other inner diameters. Reference numeral 1d denotes a bolt insertion hole formed in the metal pipe 1 communicating with a screw hole 2d of the hexagon bolt 2 described later.

The hexagonal nut 2 is sealed in the fixing position where the thickness 1b of the metal pipe 1 is made thin so that the screw hole 2d of the nut 2 is perpendicular to the axis 1c of the metal pipe. I have. One or more hex nuts 2 can be enclosed in the metal pipe 1 depending on the application.

Thus, a metal pipe-shaped nut in which the hexagon nut 2 is enclosed is formed as a whole.

FIGS. 6 and 7 show another embodiment of the metal pipe-shaped nut used in the pipe joint according to the present invention.
6 is a perspective view, FIG. 7 is a front view, and FIG. 8 is a cross-sectional view taken along line BB of FIG. In the figure, 1 is a metal pipe, and 2 is a hexagon nut.

The metal pipe 1 has an inner diameter 1a having a diameter smaller than the distance 2c between the opposite sides 2a and 2b of the hexagon nut 2, and the opposite sides 2a,
A fixing position with a distance of 2b is formed. Here, the fixing position is formed by expanding the pipe thickness 1b at the corresponding position outward so that the inner diameter of the metal pipe at the fixing position is larger than the other inner diameters. Reference numeral 1d denotes a bolt insertion hole formed in the metal pipe 1 communicating with a screw hole 2d of the hexagon nut 2 described later.

The hexagonal nut 2 is arranged such that the screw hole direction of the nut 2 is perpendicular to the axis 1c of the metal pipe 1 at a fixing position formed by expanding the pipe thickness 1b of the metal pipe 1 outward. It is enclosed in.

In this way, a metal pipe-shaped nut in which the hexagon nut 2 is enclosed as a whole is formed.

An example of a method of manufacturing the metal pipe-shaped nut thus formed will be described below.

First, the opposite sides 2a of the hexagon nut 2 only at the place where the hexagon nut 2 of the molded metal pipe 1 is fixed,
Pressing the metal plate thinly at the place where the hexagonal nut is fixed in advance so that the distance of 2b can be secured in the molded pipe, or squeezing the metal plate thinly, or expanding it in the outer peripheral direction of the pipe and sealing it with a screw hole of a hexagonal bolt The bolt insertion hole 1d is previously opened by a press so that the bolt insertion hole 1d can be used in a state of a metal plate. In the press working, the sealing of the hexagon nut and the forming of the pipe shape are performed simultaneously. After being formed in a pipe shape, the seam in the outer peripheral direction may be reinforced by welding or the like.

Although the embodiment has been described mainly on the case where hexagonal bolts are used, the same applies to the case where square bolts are used.

The metal pipe-shaped nut thus constructed is different from the pipe joint shown in FIGS. 1 and 2 in that the tightening band 15, the metal pipe-shaped washer 13, and the bolt 16 are used.
Together with the bolts.

[0028]

As described above, the present invention has the following effects.

In the first to third aspects, the pipe joint has a metal pipe-shaped washer and a metal pipe-shaped nut at the bolted portion, so that the pipe joint becomes large.
Even if the diameters of the washers and nuts are large, less material is required, compared to metal rod-shaped ones, and it is inexpensive, and the weight is light, which leads to an improvement in workability.

In the second and third aspects, the fixing position of the hexagonal or square nut is set in the metal pipe having an inner diameter smaller than the distance of the opposite side of the hexagonal or square nut. Form with securing the distance,
Here, the hexagonal or square nut is fixed so that the screw hole direction is in the axial direction of the metal pipe, so that the hexagonal nut or square nut cannot move or rotate. Can be prevented from falling off.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of an embodiment of a pipe joint according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a perspective view showing an embodiment of a metal pipe-shaped nut used for a pipe joint according to the present invention.

FIG. 4 is a front view of the same.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a perspective view showing another embodiment of the metal pipe-shaped nut used for the pipe joint according to the present invention.

FIG. 7 is a front view of the same.

FIG. 8 is a sectional view taken along the line BB of FIG. 7;

FIG. 9 is a front view of a conventional pipe joint using a metal rod-shaped washer and a nut.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal pipe 1a Inner diameter of metal pipe 1b Pipe thickness at fixing position of hexagon nut 1c Shaft center 1d Bolt insertion hole 2 Hex nut 2a Hex nut side 2b Hex nut side 2c Distance between opposing sides of hexagon nut 2d Screw hole 11 Housing 12 Rubber sleeve 13 Metal pipe-shaped washer 14 Metal pipe-shaped nut 15 Fastening band 15a Folded part 15b Folded part

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshio Yuhara 23-5 Tatsutacho, Adachi-ku, Tokyo Taisei Corporation F-term (reference) 3H015 DA04 3H017 FA03

Claims (3)

[Claims] An end in a circumferential direction has a bolt fastening portion at a discontinuous portion of a cylindrical housing that is discontinuous,
In a pipe joint having a sleeve for sealing to a pipe to be internally connected, the bolted portion has a metal pipe-shaped washer on one of opposite ends of a tightening band and a metal pipe-shaped nut on the other. A pipe joint characterized by the above-mentioned. 2. A metal pipe-shaped nut is provided with a hexagonal or a hexagonal or square nut at a fixing position in which a distance between opposing sides of a hexagonal or square nut in a metal pipe having an inner diameter smaller than a distance between opposing sides of the hexagonal or square nut is secured. A square nut is sealed so that the screw hole direction of the nut is perpendicular to the axial direction of the metal pipe, and a bolt insertion hole communicating with the screw hole of the hexagonal or square nut is formed in the metal pipe. The pipe joint according to claim 1, wherein: 3. The fixing position where the distance between the opposite sides of the hexagonal or square nuts of the metal pipe is ensured is reduced by reducing the thickness of the pipe plate so that the inner diameter of the metal pipe at the fixing position is larger than the other inner diameters. The pipe joint according to claim 2, wherein the pipe joint is inflated in a direction.