JPH0738729Y2 - Connection device for metal pipe products - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for abutting, fitting and connecting two metal pipes having the same diameter, and is particularly applicable to an assembling type daily commodities constructed by connecting metal pipes. Connected device.

[0002]

2. Description of the Related Art Daily commodities assembled by connecting metal pipes include, for example, clothes-drying rods, clothes-drying equipment, and futon clothes. As a device for connecting these pipes, the invention disclosed in "Futon dryer", which is the application of the applicant of the present application, is well known (Jpn. Pat. Appln.
issue).

In the above invention, the tip of one pipe is squeezed to provide a circumferential groove and a groove communicating from the tip to the outside of the fitting range having a reduced diameter, and the inward projection provided on the other pipe. Is fitted in the groove.

According to this structure, the pipes can be connected to each other when the protrusion is fitted to the circumferential groove without using a troublesome screw structure for manufacturing and assembling, but the pipe is rotated in the circumferential direction. Sometimes it doesn't stop, so there is a problem of lack of moderation. In such a connection by fitting the protrusion and the groove, it is required that the large diameter portion and the small diameter portion are properly fitted, and it is necessary to pay close attention to the difference in diameter when designing. Or, on the contrary, it will not fit because it is too tight.

That is, despite the simple connection, the product tends to be difficult to manufacture and difficult to use. In addition, even if it is manufactured with an appropriate fitting accuracy, it is inevitable that looseness increases with time. Further, since the looseness once generated cannot be eliminated, it may be pointed out that the usable period is short.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and its object is to make it possible to connect metal pipes to each other without backlash. The device is not required to have a special structure or precision, and is therefore inexpensive to implement.

[0007]

[Means for Solving the Problems] In order to solve the above problems,
In the present invention, when connecting metal pipes to each other, a relatively small diameter connection is made so that the connection end 1 of one pipe can be inserted into the opening 3 of the connection end 2 of the other pipe by reducing the pipe diameter .
The end 1 is integrally formed with the pipe end portion , the relatively large diameter connecting end 2 is formed with the embossed portion 4 protruding inward in the radial direction, and the embossed portion 4 of the embossed portion 4 is formed on the outer surface of the other small diameter connecting end 1. An introductory groove 5 that can be engaged is placed from the end of the pipe to the position of the embossed portion 4.
A corresponding length is formed inward in the axial direction, and the embossed portion 4 is extended to the left and right in succession to the inner end of the annular groove 5.
The engaging groove 6 is formed in the circumferential direction of the pipe that can be moved sufficiently in the direction to engage with the pipe, and the embossed portion 4 is pushed radially outward by the groove bottom 7 so that the embossed portion 4 of the opening 3 is not provided. A means for forming a bulging portion 8 bulging outward in the radial direction at the end portion of the engaging groove 6 in order to press the inner surface 2a on the other side and the outer surface 1a of the connecting end 1 having a small diameter into pressure contact Is.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will be given below with reference to the drawings. The exemplified connecting device relates to a stainless steel pipe product, and this type of stainless steel pipe is thinned by work-drawing an original product having a predetermined pipe diameter to cause work hardening.

The metal pipes 11 and 12 to be connected are originally
Each has the same pipe diameter, and the connecting end 1 of the one pipe 11 is slightly smaller than the inner diameter of the opening 3 so that it can be inserted into the opening 3 of the connecting end 2 of the other pipe 12 with an appropriate sliding contact degree. Is formed with a small diameter. The connecting end 2 of the other pipe 12 has a relatively large diameter with respect to the connecting end 1 having the small diameter, but no operation of changing the pipe diameter is performed on the large diameter pipe 12.

An emboss 4 protruding inward in the radial direction is formed at one position on the connecting end 2 having a relatively large diameter, at a position separated from the end 10 by a predetermined distance. As its name implies, the embossed portion 4 is formed by extruding the pipe material of the large-diameter connecting end 2 inward in the radial direction with a die. Since the large-diameter connection end 2 is not processed at all, the structural strength of this portion is kept as it is as the metal pipe 12.

On the outer surface of the other small-diameter connecting end 1, an introduction groove 5 is formed parallel to the axial direction of the pipe so that the embossed portion 4 can be engaged, and the introduction groove 5 has an inner end 5a. An engagement groove 6 is formed in the pipe circumferential direction so that the embossed portion 4 can be continuously engaged. These bi-concave grooves 5 and 6 are formed so as to extrude the drawn pipe material of the connection end 1 inward in the radial direction.

The starting end 9 of the narrowed portion forming the small-diameter connecting end has a large-diameter connecting end 2 with a gap between the starting end 9 and the engaging groove 6.
The distance between the end 10 and the embossed portion 4 is set to be substantially equal. Therefore, when the embossed portion 4 engages with the engagement groove 6 in the circumferential direction, the end portion 10 of the large-diameter connection end 2 comes into contact with the inclined start end 9 of the narrowed portion and contributes to positioning in the pipe axial direction. .

The engaging recessed groove 6 has a terminating end, and pushes the embossed portion 4 outward in the radial direction with the groove bottom 7 to connect the inner surface 2 a to the other side of the opening 3 where the embossed portion 4 is not provided and which has a small diameter. Edge 1
The bulging portion 8 bulges outward in the radial direction so as to be pressed against the outer surface 1a (see FIGS. 3 and 5).

Therefore, the embossed portion 4 has the slope 8 of the bulging portion 8.
When a and 8b are applied, the large diameter connecting end 2 is pulled by the groove bottom 7 toward the top of the bulging portion 8 as a whole, and the outer surface 1a of the small diameter connecting end 1 and the inner surface 2a of the large diameter connecting end 2 are pressed together. It is possible.

Such a connecting device may be provided at both ends of a pipe to connect another pipe vertically or horizontally (FIG. 3). In FIG. 3, the positions of the upper and lower connecting devices are changed by approximately 180 degrees, but this is for illustration purposes only and is not a limitation.

In the above embodiment, the embossed portion 4 is provided at one location, and the bulge portion 8 is also provided at only one location 180 degrees opposite the introduction concave groove 5, but the embossed portion 4 and the introduction concave groove are provided. 5
It is obvious that a plurality of bulges 8 may be provided and the bulging portions 8 may be provided between the concave grooves 5. Further, the introduction groove 5 and the engagement groove 6 do not necessarily have to be orthogonal to each other,
It is also possible to adopt a configuration in which the curves are continuous as shown by the chain line in FIG.

[0017]

Since the present invention is constructed and operates as described above, the connection between the metal pipes is such that the embossed portion 4 on one pipe side and the other pipe side are continuous with each other.
Not only can be easily performed by the concave grooves 5 and 6, but also when the embossed portion 4 comes close to the bulging portion 8 provided at the end portion of the engaging concave groove 6, the embossed portion 4 is radially outwardly moved by the groove bottom 7. As a result of being pushed toward one side, the outer surface 1a of the small-diameter connecting end 1 and the inner surface 2a of the large-diameter connecting end 2 are brought into pressure contact with each other, so that looseness of fitting of the pipes is absorbed and a loose connection is realized. There is an effect that can. It is also possible to keep the connection position between the pipes constant.

Further, the pipe product connecting device having the above-described effect is manufactured by simply metal-working the connection ends 1 and 2 of the metal pipe, with the man-hours which are almost the same as the conventional ones, without requiring a special structure and precision. There are features that can be done.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the device of the present invention.

FIG. 2 is a development view of a small diameter connection end.

FIG. 3 is an exploded perspective view of an embodiment of the device of the present invention.

FIG. 4 is a cross-sectional view of a large diameter connection end.

FIG. 5 is an end view of a small-diameter connection end.

FIG. 6A is a vertical cross-sectional view in which the embossed portion is engaged with the introduction concave groove. (B) A longitudinal sectional view showing a state where the embossed portion is stopped by the bulging portion.

Claims (3)

[Scope of utility model registration request] 1. A device for connecting and connecting the connecting ends 1, 2 of two metal pipes having the same pipe diameter to each other by abutting them together, and by narrowing the pipe diameter of the connecting end 1 of one of the pipes. A relatively small-diameter connecting end 1 is formed integrally with the pipe end so that it can be inserted into the opening 3 of the connecting end 2 of the other pipe.
A relatively large diameter connecting end 2 is formed with an embossed portion 4 projecting inward in the radial direction, and an introduction groove 5 with which the embossing portion 4 can be engaged is formed on the outer surface of the other small diameter connecting end 1. From the edge
A length corresponding to the position of the embossed portion 4 is formed toward the inner side in the axial direction, and the left and right sides are continuously formed at the inner end of the introduction concave groove 5.
The extension embossed portion is sufficiently moved in the circumferential direction to form an engaging concave groove 6 which can be engaged in the circumferential direction of the pipe, and the embossed portion 4 is pushed outward in the radial direction by the groove bottom 7 to emboss the opening 3. In order to press the inner surface 2a of the other side not provided with 4 and the outer surface 1a of the small-diameter connecting end 1 into pressure contact, a bulging portion 8 bulging outward in the radial direction is formed at the end of the engaging groove 6. A characteristic connecting device for metal pipe products. 2. The end portion 1 of the connecting end 2 having a large diameter is such that the distance between the engagement end 9 of the narrowed portion of the connecting end 1 having a relatively small diameter and the engaging groove 6 is large.
The connection device for metal pipe products according to claim 1, wherein the distance between 0 and the embossed portion 4 is set to be substantially equal. 3. The metal pipe product connection according to claim 1, wherein sloped surfaces 8a, 8b are formed at the terminal end of the engaging groove 6 so that the groove bottom 7 gradually rises toward the bulging portion 8. apparatus.