JPH0868405A - Pipe joint - Google Patents

Abstract

PURPOSE: To provide a pipe joint by which two pipes can be certainly connected to each other, and also the connecting parts of both pipes can be smoothly flushed. CONSTITUTION: A pipe joint A is fitted in the connecting parts of pipes 5 for mutually coaxially connecting the end parts of the pipes 5 having the same diameters, and provided with a pipe inner side surface contact members 1 which are radially extended against the shaft lines of the pipes 5 so as to be brought in contact with the pipe inner side surfaces, and the pipe inner side surface contact members 1 are built up to be freely parted from and/or brought in contact with the pipe inner side surfaces through a contact member moving means, and also possible to press the pipe inner surfaces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint capable of reliably connecting two pipes and making the connecting portions of both pipes smooth and flush.

[0002]

2. Description of the Related Art Conventionally, as a pipe joint used to connect two pipes, there is one shown in FIG.

This is a cylindrical body 100 having an outer diameter that is the same as the inner diameter of two circular pipes 90, 90 to be connected, and is provided with a slit portion 101 by axially cutting the peripheral surface of the cylindrical body 100.
It is configured to bend in the radial direction by the amount of 101. In FIG. 7, 102 is a cutting portion provided along the longitudinal direction in consideration of the flexibility and rigidity of the tubular body 100.
The second part is thin.

Round pipe using the pipe joint X
To connect 90 and 90 coaxially, insert the pipe joint X from the end of one round pipe 90 with the pipe joint X bent, and then insert the other end of the round pipe 90 on the connection side and push it in. The ends of both pipes 90, 90 are brought into contact with each other, and the restoring force of the bent pipe joint X presses the inner surfaces of the pipes 90, 90 to perform the joint function.

Further, when the pipe is a square pipe, a square tubular body which can be fitted inside the same square pipe is formed as a pipe joint.

[0006]

However, the above-mentioned pipe joint X has the following problems.

That is, regarding the round pipe 90, the end portion of the manufactured round pipe 90 is not strictly a perfect circle, but is often an ellipse.

Therefore, when the round pipes 90 are connected to each other, a stepped portion Y is often formed at the connecting portion, as shown in FIG.

For example, when the connected pipe is used for handrails of stairs or the like, there is a risk that the stepped portion Y may injure a person, and it is not suitable as a product.

This causes a lot of loss, and when a handrail is to be installed in the construction site, it may take time to have a smooth connection portion, and the work may be performed. It sometimes caused a decrease in efficiency.

Further, in the conventional pipe joint X as described above, the restoring force of the flexure becomes weaker during a long period of use, and the pipe joint X shifts inside the round pipe 90 to fulfill the function as the pipe joint X. Sometimes it disappeared.

Therefore, an object of the present invention is to provide a pipe joint which can solve the above problems.

[0013]

DISCLOSURE OF THE INVENTION The present invention is a pipe joint which is fitted into a connecting portion of a pipe so as to coaxially connect end portions of the pipe having the same diameter, and which is radial to the axis of the pipe. A pipe inner surface abutting member that extends to the inner surface of the pipe and abuts against the inner surface of the pipe. The present invention relates to a pipe joint characterized in that the inner side surface can be pressed.

The present invention is also characterized by the following configurations.

(A) The pipe inner side surface abutting member has a base end connected to the left and right long side edges of a rectangular connecting plate, and a pipe inner side surface abutting member in which the tip end edge is extended and expanded. The pipe inner side surface is formed by arranging a pair of abutting pieces on the inner surface of the pipe in a back-to-back manner and facing each other, and connecting the pieces relatively close to and away from each other via contact piece moving means. Is configured to be able to be pressed.

(B) The contact piece moving means is screwed into a bolt insertion hole formed in one pipe inner side surface contact piece, and has its lower end abutted against the central portion of the other pipe inner side surface contact piece. In addition, two bolts were provided at regular intervals in the longitudinal direction of the pipe inner surface abutting piece.

(C) A curved plate for a round pipe that presses closely against the inner side surface of the round pipe is arranged at a position symmetrical with respect to the axial direction of the bolt, and both plates are brought into contact with a pair of inner side surfaces of the pipe. The bolts on one side were attached integrally or detachably to the tip edges extending in the same lateral direction with respect to the axial direction of the bolt.

(D) A rotary tool insertion hole corresponding to the above-mentioned bolt is formed near each of the connection side end portions of the two pipes to be connected.

(E) The above bolts are hexagon socket head bolts.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment will be described below with reference to the drawings.

FIG. 1 is an explanatory view showing an arrangement state of a pipe joint according to this embodiment, and FIG. 2 is a transverse sectional view of the pipe joint.

In this embodiment, the pipe is the round pipe 5, and the pipe joint A is fitted in the connecting portion of the round pipe 5 in order to coaxially connect the ends of the round pipe 5 having the same diameter. It is used.

As shown in FIGS. 1 and 2, in the pipe joint A, a pair of pipe inner surface abutment pieces 1 whose tip edges 11 extending radially with respect to the axis of the round pipe 5 abut on the pipe inner surface 51. , 1 and the inner side contact piece 1,
1 is the pipe inner side contact member.

Both the pipe inner side contact pieces 1, 1 are configured to be freely contactable to and separable from the pipe inner side surface 51 via a bolt 2 as a contact member moving means and capable of pressing the pipe inner side surface 51. ing. In this embodiment, the bolt 2 has a hexagon socket on the upper end surface.
It is a hexagon socket head cap screw with 21.

That is, a pair of pipe inner side contact pieces 1
Are attached to and connected to the bolt 2 so as to be back-to-back and opposite to each other, and can be relatively approached and separated by rotation of the bolt 2.

The pipe inner side contact piece 1 has a base end connected to the left and right long side edges of the rectangular connecting plate 13, and the front end edges 11 and 11 are expanded and expanded. It is composed of the parts 12 and 12 and is formed in a substantially gutter shape in cross section. Further, in the state in which it is arranged in the round pipe 5, the leading edges 11, 11 are
It will be extended symmetrically with respect to the axis of.

Further, the pair of pipe inner side contact pieces 1,
At the tip edges 11, 11 of each abutting portion 12, 12 of 1
The curved plates 3 are integrally connected to the tip edges 11 extending in the same lateral direction with respect to the axis line.

The curved plates 3, 3 are arranged in line symmetry with respect to the axial direction of the bolt 2, and are arranged so as to closely contact and press the inner surface of the round pipe 5. It is formed so as to have the same curvature rate.

With such a structure, the structure is simplified, mass production in a factory or the like is facilitated, and it is advantageous in terms of cost.

Further, the pair of pipe inner side contact pieces 1, 1
On one connecting plate 13, tapped bolt insertion hole 1
4, 14 are bored at regular intervals in the longitudinal direction, and bolts 2 serving as contact member moving means are screwed into both insertion holes 14, 14, respectively, and the lower ends of the bolts 2 are attached. , The center of the other connecting plate 13 is abutted.

Further, rotary tool insertion holes 6 and 6 corresponding to the bolt 2 are formed near the connection side end portions of the two round pipes 5 and 5 to be connected.

Further, the distance of the rotary tool insertion hole 6 from the end of the round pipe 5 is 1/2 of the distance between the two bolts 2 and 2 described above.

The case where the pipe joint A having the above structure is actually used will be described below.

That is, the bolt 2 of the pipe joint A,
Rotate 2 in the direction to loosen it beforehand, and
With one of them slightly close to each other, fit about one half of the pipe joint A into one of the round pipes 5 to be connected, then fit the other round pipe 5 into the pipe joint A, and rotate with the bolt 2. The tool insertion holes 6 are made to correspond to each other and are coaxially positioned.

As shown in FIG. 1, the pipe joint A
Are fitted over the connecting portions of the round pipes 5, 5 so that half of the entire length is fitted in each round pipe 5.

Then, a rotary tool such as a wrench is inserted into the rotary tool insertion holes 6,6, the tip of the rotary tool is fitted into the hexagonal hole 21 of the bolt 2, and rotated, whereby the pipe inner side contact piece 1 , 1 are moved in the direction of separating them relatively,
The curved plates 3,3 connected to the tips of the abutting portions 12,12 are pressed against the pipe inner side surface 51 to the extent that the ends of the connecting portions 5,5 are slightly expanded.

This is because the end of the round pipe 5 that is usually manufactured is not exactly a perfect circle, but is often an ellipse. Therefore, simply connecting the round pipes 5 to each other will cause a step at the connecting portion.
The ends are connected to each other in a slightly expanded state so that they have the same shape.

At this time, the pressing amount of each round pipe 5 is adjusted appropriately to adjust. This is because the end of the round pipe 5 that is usually manufactured is not a strict perfect circle, but rather has an elliptical shape, and if the round pipes 5 are simply connected together, a step is formed at the connecting portion. In order to prevent this, the end portions of the round pipes 5 are slightly expanded and connected so as to have the same shape.

By connecting as described above, the ends of the connecting portions of the round pipes 5, 5 are flush with each other, and a beautiful connecting surface can be obtained as if it were one round pipe.

Moreover, the pipe joint A can surely press the both round pipes 5 and 5 from the inside to surely connect them.

As described above, by using the pipe joint A according to the present invention, a reliable connection is possible, and moreover, it is possible to make a flat connection without causing a step at the connecting portion. Thus, for example, when the connected round pipe 5 is used for handrails such as stairs, the feel at the connection portion is improved.

In particular, when a step is formed, if the step becomes an edge, the hand may be injured, but such a case can be completely prevented and the safety is remarkably improved.

Next, as a second embodiment, FIG. 3 and FIG.
Will be described. The reference numerals used in FIGS. 3 and 4 are the same as those used in the previous embodiment.

In this case, the connecting pipe is a square pipe 7, and the pipe joint B in this embodiment is used.
Has a configuration in which the bending plate 3 of the pipe joint A in the previous embodiment is removed.

As shown in FIGS. 3 and 4, the tip edges 11, 11 of the abutting portions 12, 12 of the pipe inner side abutting pieces 1, 1 are formed by the adjoining surfaces of the square pipes 7, 7, respectively. The bolt 2 is designed to come into contact with the even portion extending in the axial direction.
The inner side surfaces of the square pipes 7, 7 are pressed by rotating the pipes to move the pipe inner side surface contact pieces 1, 1 in a direction in which they are relatively separated from each other, so that the joint function is surely performed.

Also in this case, if the end shapes of the square pipes 7 do not match, the pipe inner side contact pieces 1, 1
By adjusting and adjusting the pressing amount by, it is possible to obtain a flush connection surface.

As described above, also in the pipe joint B according to this embodiment, the same effect as that of the previous embodiment can be obtained.

Further, as a third embodiment, a pipe joint C shown in FIGS. 5 and 6 will be described. In addition,
Regarding the reference numerals used in FIGS. 5 and 6, the same constituents as those in the first embodiment have the same reference numerals.

This is used for connecting the round pipes 5 as in the first embodiment. In the first embodiment, however, the curved plates 3, 3 are connected to the pair of pipe inner side contact pieces 1. 1, 1 is integrally attached to the leading edges 11 and 11, whereas this embodiment is different in that it is detachably attached.

That is, as shown in FIGS. 5 and 6, the contact piece receiving portion 31 is provided on the inner surface of the curved plate 3,3 so as to correspond to the tip edges 11,11 of the pipe inner surface contact pieces 1,1. , 31,
The tip of the abutting piece 1,1 on the inner surface of the pipe
11 and 11 can be engaged. With this configuration, by attaching and detaching the curved plates 3, 3, the same pipe joint C can be used for both the round pipe 5 and the square pipe 7, thus increasing versatility.

Further, in the present embodiment, the lower end of the bolt 2 is formed in a pointed shape, and the connecting plate on the side abutting the bolt 2 is formed.
A concave portion 32 for bolt contact is provided in 13 to prevent slipping or the like on the contact surface of the bolt 2 so that the bolt 2 can be securely screwed. Incidentally, such a configuration can be applied to the first and second embodiments described above.

[0052]

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

It is possible to connect the pipes reliably, and it is possible to connect the pipes flush with each other without causing a step at the connecting portion. For example, the connected pipes can be used as a handrail for stairs or the like. When used, the feel at the connection is improved. In particular, when a step is formed, if the step becomes an edge, the hand may be injured, but such a case can be completely prevented and the safety is significantly improved.

The structure is simple, mass production is possible, and it is advantageous in terms of cost.

The pressing amount can be adjusted with respect to each of the two connecting pipes, and the connecting surface can be easily made flush. Further, the structure can be simplified, so that the cost is low.

A curved plate is detachably attached to the tip edges of the pair of pipe inner side abutting pieces that extend to the same side with respect to the axial direction of the bolt, so that a round pipe and a square pipe can be attached by the same pipe joint. It can be used with any type of pipe, increasing versatility.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a disposition state of a pipe joint according to a first embodiment.

FIG. 2 is an explanatory view of the pipe joint in a sectional view.

FIG. 3 is an explanatory view showing an arrangement state of a pipe joint according to a second embodiment.

FIG. 4 is an explanatory view according to the same sectional view.

FIG. 5 is an explanatory view of a pipe joint according to a third embodiment in a sectional view.

FIG. 6 is an exploded view of the pipe joint.

FIG. 7 is an explanatory view of a conventional pipe joint.

[Explanation of Codes] A Pipe joint 1 Pipe inner side abutment piece 2 Bolt 3 Curved plate 5 Round pipe 6 Rotating tool insertion hole 11 Tip edge 12 Abutment 13 Connection plate

Claims (6)

[Claims] 1. A pipe joint fitted in a connecting portion of a pipe for coaxially connecting end portions of pipes having the same diameter, the pipe joint extending radially with respect to an axial line of the pipe and being provided on an inner surface of the pipe. A pipe inner side surface abutting member that abuts is provided, and the pipe inner side surface abutting member is configured to be freely separable from and in contact with the pipe inner side surface via the abutting member moving means and capable of pressing the pipe inner side surface. This is a pipe joint. 2. The pipe inner side surface abutting member has a base end connected to left and right long side edges of a rectangular connecting plate (13) and a front end edge (11), (11) expanded. The pipe inner side contact piece (1) is extended to, and the pair of pipe inner side contact pieces (1) are arranged back to back and in an opposed state, and
2. The pipe joint according to claim 1, wherein the pipe joint is configured so as to be relatively close to and away from each other via the contact piece moving means so that the inner surface of the pipe can be pressed. 3. The abutment piece moving means is screwed into a bolt insertion hole (14) formed in one pipe inner side surface abutment piece (1), and has a lower end in the other pipe inner side surface abutment piece (1). Use the bolt (2) that comes into contact with the center of 1), and use the same bolt (2).
3. The pipe joint according to claim 2, wherein two pipe inner surface abutting pieces (1) are arranged at regular intervals in the longitudinal direction. 4. Curved plates (3), (3) for round pipes, which press closely against the inner surface of the round pipe (5), are arranged at positions symmetrical with respect to the axial direction of the bolt (2). , Both plates
(3) and (3) are extended in the same lateral direction with respect to the axial direction of the bolt (2) in the pair of pipe inner side contact pieces (1) and (1), respectively. 4. The pipe joint according to claim 3, wherein the pipe joints are integrally or detachably attached to each other. 5. The rotary tool insertion hole (6) corresponding to the bolt (2) is formed near each of the connection-side end portions of the two pipes to be connected, according to claim 3 or 4. The listed pipe joint. 6. The pipe joint according to claim 3, wherein the bolt (2) is a hexagon socket head cap bolt.