JP3022110U - Nut for connecting metal pipe ends - Google Patents

Abstract

(57) An object of the present invention is to provide a nut for connecting a metal pipe end portion that can be easily and stably fixed in the pipe end portion of the metal pipe. A nut (10) fixed in an end portion of a metal tube, has a substantially frustoconical main body (13), a portion near a large end of the main body (13) is formed into a cylindrical portion (12), and a peripheral edge of a small end. A plurality of obliquely elastically deformable projections 14 formed of a metal piece 17 such as a skirt hem having a plurality of recesses 15 formed on the periphery thereof and facing the large end. When the main body 13 is inserted into the end portion of the metal pipe with the front end as the front end and the main body 13 is to be pulled out of the end portion of the pipe, a direction substantially opposite to the direction in which the edge of the protrusion 14 is inserted. Toward the end, it can bite into the tube wall in the end portion and prevent the main body 13 from coming out and rotating, and the cylindrical portion 1
The outer peripheral surface of 2 fits on the tube wall in the end.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a metal pipe end connecting nut, and more particularly to a metal pipe end connecting nut that can be stably fixed in a pipe end of a metal pipe.

[0002]

[Prior art]

 Conventionally, when the pipe wall of a metal pipe is thin, it is difficult to form a screw thread for connecting the pipe to another member via a bolt or the like on the inner surface of the pipe end portion. Therefore, generally, a cylindrical nut 31 is secured within the end of the tube 30 as shown in FIG. Inside the nut 31, a screw thread 32 is formed. The nut 31 is integrally joined to the metal pipe by spot welding 33 between its outer end and the end of the metal pipe 20.

On the other hand, according to the conventional technique shown in FIG. 5, a through hole 34 is formed in the tube wall of the metal tube 30 near the end, and spot welding 35 is performed through this through hole 34. Tighten the nut 31 into the end of the tube 30.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned structure, the spot welding traces remain on the appearance, and it is not sufficient when a metal pipe is used for a display field. Further, since spot welding is performed, there is a drawback that it is troublesome. Further, because the inner diameter of the metal pipe may be larger than the outer diameter of the nut due to the tolerance, the nut 31 cannot be stably fixed in the end portion of the metal pipe.

The present invention has been made in view of the above problems, and does not have a negative influence on the appearance of a metal tube, does not require work such as welding, and is easily and stably fixed in the tube end portion of the metal tube. It is an object of the present invention to provide a metal pipe end connecting nut that can be used.

[0006]

[Means for Solving the Problems]

 The present invention has been made in order to achieve the above-mentioned object, and is a nut that is fixed in the end of a metal pipe, and has a substantially frustoconical body, and the portion near the large end of the body is a cylindrical portion. A plurality of obliquely elastically deformable projections that are formed on the periphery of the small end and that face the large end, and the small end is the front end, and the main body is inserted into the end of the metal pipe. After that, when attempting to pull out the main body from the end of the pipe, the edge of the protrusion bites into the pipe wall inside the end in a direction almost opposite to the direction in which the edge of the projection is inserted, and the main body escapes and rotates. The metal pipe end connecting nut according to claim 1, wherein the outer peripheral surface of the cylindrical portion is fitted to the pipe wall in the end.

Further, a metal piece such as a skirt skirt is formed on the peripheral edge of the small end of the nut body, and a plurality of recesses are formed on the peripheral edge of the metal piece to enable the elastic deformation of the plurality of elastic bodies. You may form a different protrusion.

[0008]

[Embodiment of device]

 With the above configuration, the edge of the protrusion is directed in a direction substantially opposite to the direction in which the protrusion is inserted and cuts into the pipe wall in the end of the metal pipe, so that the nut can be prevented from coming out and rotating. By doing so, the metal pipe can be reliably connected to another member or the like.

A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a preferred embodiment of the present invention, FIG. 2 is a side view showing a state in which a nut of the present invention is fitted into an end of a metal pipe shown in section, and FIG. 3 is a nut of the present invention. FIG. 4 is a front view showing a state in which is fitted into the end of the metal pipe shown in cross section.

As shown in FIGS. 1 to 3, a metal pipe end connecting nut 10 according to the present invention has a substantially truncated cone shape having a screw hole 11 therein. Since the nut 10 has a thin tube wall, the nut 10 is fitted into the end portion of the metal tube 20 in which a thread is not easily formed on the inner surface of the tube end, and the metal tube 20 is connected to another member.

Specifically, the nut 10 has a substantially frustoconical main body 13 in which a screw hole 11 is formed in the length direction. A portion of the main body 13 near the large end is formed into a cylindrical portion 12 having an outer diameter substantially the same as the inner diameter of the metal tube 20, and a plurality of slanting directions are formed on the periphery of the small end toward the large end. Elastically deformable projections 14 are formed. In this embodiment, a metal piece 17 such as a skirt skirt is formed on the periphery of the small end of the main body 13, and a plurality of recesses 15 are formed on the periphery of the metal piece 17 to form the plurality of elastic deformations. Form possible protrusions 14.

The nut 10 is to be fitted into the end portion of the metal tube 20 with its small end being the front end. When the nut is to be pulled out of the end portion of the pipe 20 after the fitting, the edge 16 of the protrusion 14 is oriented in a direction substantially opposite to the fitting direction and cuts into the pipe wall in the end portion. Prevent withdrawal. In the bite state, the rotation of the nut 10 can be prevented.

Since the diameter of the metal piece 17 is set to be slightly larger than the inner diameter of the pipe 20 and the projection 16 thereof is set to have an elastic deformation force, the bite can effectively prevent the nut 10 from being pulled out and rotated. .

Further, in the fitted state, the outer peripheral surface of the cylindrical portion 12 is fitted to the tube wall of the metal tube 20. The number of the protrusions 14 is preferably 6 or 8.

Since the nut 10 has the bite structure, the nut 10 can be stably fixed in the end portion of the metal tube 20. Moreover, since the nut 10 is fixed inside the pipe end, no external spot welding work is required. Therefore, the appearance is good. Further, even if the outer diameter of the cylindrical portion 12 is slightly smaller than the inner diameter of the metal pipe 20, the fixing configuration of the nut 10 is not adversely affected because of the bite configuration.

[0016]

[Effect of device]

 As described above, the nut of the present invention can be easily and stably fixed in the end portion of the metal pipe, so that the metal pipe can be easily connected to other members. Moreover, since it is not necessary to perform spot welding or the like, the appearance of the metal pipe is not spoiled.

[Brief description of drawings]

FIG. 1 is a perspective view of a preferred embodiment of a metal pipe end connecting nut according to the present invention.

FIG. 2 is a side view showing a state in which the metal pipe end connecting nut of the present invention is fitted into the metal pipe end shown in the sectional view.

FIG. 3 is a front view showing a state in which the metal pipe end connecting nut of the present invention is fitted into the metal pipe end shown in the sectional view.

FIG. 4 is an explanatory diagram of a conventional technique.

FIG. 5 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 10 Nut 11 Screw Hole 12 Cylindrical Part 13 Nut Body 14 Elastically Deformable Protrusion 15 Recess 16 Edge 17 Metal Piece 20 Metal Pipe 30 Metal Pipe 31 Nut 32 Screw Thread 33 Spot Welding 34 Through Hole 35 Spot Welding

Claims (2)

[Scope of utility model registration request] 1. A nut for fixing in an end portion of a metal pipe, which has a substantially frustoconical main body, a portion near the large end of the main body is formed into a cylindrical portion, and the large end is provided on the periphery of the large end. A plurality of obliquely elastically deformable projections facing the end are formed, the small end is the front end, the main body is inserted into the end of the metal pipe, and then the main body is moved outside the end of the pipe. In order to remove the main body, it is possible to prevent the body from escaping and rotating while biting into the pipe wall in the end portion in a direction almost opposite to the direction in which the edge of the protrusion is fitted, and at the same time, the outer circumference of the cylindrical portion. A nut for connecting a metal pipe end, wherein a surface is fitted to a pipe wall in the end. 2. A plurality of elastically deformable members are formed by forming a metal piece such as a skirt skirt on the periphery of the small end of the nut body and forming a plurality of recesses on the periphery of the metal piece. The nut for connecting a metal pipe end portion according to claim 1, wherein a protrusion is formed.