JPH0542248Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is a pipe connecting device used to connect a pair of pipes in the length direction, for example, a pipe used as a support for furniture such as a knock-down rack. The invention relates to a connecting device.

BACKGROUND ART AND PROBLEMS Conventionally, as a connecting device or a connecting structure for pipes or solid rod-like bodies, for example, as shown in FIG. Connecting member 5 having a male threaded portion 53 at the end
2 is attached with the male threaded part 53 protruding in the axial direction of the rod-like body 51, while a nut member 55 having a female threaded part 55a screwed into the male-threaded part 53 is embedded in the tube end of the other rod-like body 51. It is known that the rod-like bodies 51, 51 are connected in the length direction by screwing together the male and female screw portions 53, 55a until the end surfaces of the rod-like bodies 51, 51 come into close contact with each other.

According to such a connection structure, the male threaded portion 53 can be connected to the female threaded portion 55 without using a tool or jig.
Even an amateur can easily assemble the rod-shaped body 5 by simply screwing it into a.
1 and 51 can be connected together, and the rod-shaped bodies 51 and 51 can be disassembled to make the package more compact. Therefore, such a connecting structure of rod-like bodies is suitable for the support of a knock-down type stand hanger or the support of a rack.

However, in such a connected structure,
Since the male and female threaded portions 53, 55a are originally formed to fit into each other with a margin, the pair of rod-shaped bodies 51, 51 in the connected state.
If there is even a slight gap between the corresponding end faces, it will easily rattle. Therefore, if the pair of rod-shaped bodies 51, 51 are screwed together so strongly that there is no gap between the corresponding end surfaces, the above-mentioned rattling can be prevented.
If this were to be done manually, there would be limits to that power, and relatively powerless women and children would not be able to achieve the desired results.

In addition, to prevent such rattling,
It is also possible to make the threaded surfaces of the female and male screw parts 53, 55a as long as possible, or to make the contact area of the end contact surfaces of the rod-like bodies 51, 51 as wide as possible, but in the case of the former. In the latter case, it takes time to screw in the connection, and in the latter case, the manufacturing cost increases, which is disadvantageous in terms of cost.

This invention was made with the aim of solving the above problems, and it not only allows a pair of pipes to be connected without using tools or jigs, but also prevents wobbling in the connected state.
The present invention aims to provide a pipe connecting device that has excellent strength and can be implemented at the lowest possible cost.

Means for Solving the Problems In order to achieve the above object, this invention provides a method for connecting a pair of pipes in the length direction through joint rods inserted into corresponding pipe ends. In the coupling device, a pair of male threaded portions are provided at intervals in the axial direction of the joint rod, and in a connected state in which the end surfaces of the pipes are in contact with each other, the male threaded portion A nut member having a female threaded portion to be screwed is fixed, and a joint rod insertion hole through which the joint rod is inserted is provided in the tube end at a position spaced apart from the female threaded portion along the tube axis direction. A structure in which a pipe swing regulating body is fixedly installed is adopted.

Further, it is desirable that the joint rod is provided with a regulating protrusion that regulates screw movement so that the joint rod is not unnecessarily screwed into the pipe.

Embodiments Hereinafter, this invention will be explained based on illustrated embodiments.

1 and 2 show an embodiment of this invention, in which a pair of metal pipes 1, 1 are connected to a metal joint rod 2 inserted into the corresponding pipe ends.
It is assumed that the connection will be made through the .

The joint rod 2 is provided with male threaded parts 3, 3 at symmetrical positions at both ends in the axial direction, and the intermediate part is formed to protrude beyond the threads of the male threaded parts 3, 3, and the end surface restricts the screwed movement of the joint rod. The regulating protrusions 4, 4 are designed to act as restraints.

Each pipe 1, 1 has a pipe 1, 1 at its pipe end.
A female threaded portion 5 is screwed into the male threaded portion 3 at a position corresponding to the male threaded portions 3 of the joint rod 2 in a connected state in which the end surfaces of the joint rods 1 and 1 are in contact with each other.
Nut members 5 and 5 having a and 5a are forcibly fitted in a compressed state and are fixedly fixed in a non-rotatable manner. These pipes 1, 1 are assembled into a prefabricated rack A shown in FIG.
In order to adjust the height position of the shelf T of the rack A, a groove 6 is formed in the circumferential direction on the circumferential surface of the pipe. By forming this groove 6, a protruding part 7 is formed on the inner surface of the pipe 1, and the nut member 5 inserted from the opening of the pipe 1 comes into contact with this protruding part 7. Insertion inward from a predetermined position is prevented.

Reference numeral 8 denotes a plug-shaped pipe swing regulating body fitted into the openings of the pipes 1, 1, which is provided with a flange portion 9 on one end side and has an insertion hole 10 through which the joint rod 2 can be inserted in the axial direction. The inner surface of the insertion hole 10 comes into contact with the circumferential surface of the joint rod 2, thereby regulating the swinging of the pipe 2. Also,
A stepped portion 11 is provided in the axially intermediate portion of the insertion hole 10, with which the regulating protrusion 4 of the joint rod 2 comes into contact, so as to be able to restrict screwing movement of the joint rod 2 beyond a predetermined level.

To connect pipes using the pipe connecting device configured as described above, first, one end of the joint rod 2 is inserted into the pipe 1 through the opening of one pipe 1, and the male threaded portion 3 is inserted into the female threaded portion 5a. The regulating protrusion 4 of the joint rod 2 is screwed into the pipe swing regulating body 8.
Screw it in firmly until it comes into contact with the stepped portion 11 of the screw and cannot be screwed in any further. Next, joint rod 2
The other end is inserted into the other pipe 1, and the other pipe 1 is rotated so that its female threaded portion 5a and the male threaded portion 3 at the other end of the joint rod 2 are screwed together. Then, by firmly screwing the pair of pipes 1, 1 until their end surfaces come into contact with each other, the connection of the pipes 1, 1 is completed, and the desired strong connection without wobbling can be obtained. Furthermore, even if the above screwing force is insufficient and the end surfaces of the pipes 1 and 1 are in loose contact with each other, when the pipe 1 tries to swing, the joint rod 2 circumferential surface and the insertion hole 10 The swinging of the pipe 1 is restricted by the inner surfaces of the pipe 1 coming into contact with each other.

FIG. 3 shows another embodiment of the pipe connecting device according to this invention, in which, contrary to the previous embodiment, a pair of male threaded portions 23, 23 are provided at the longitudinally intermediate portion of the joint rod 22. On the other hand, in response to this,
A plug-like nut member 25 having a female threaded portion 25a is press-fitted to the opening side of the end of the pipe 1 in a non-rotatable state, and the joint rod 22 can be inserted into the inside of the end of the pipe in the axial direction. Joint rod insertion hole 3
The swing regulating body 28 having a diameter of 0 is fitted in a compressed state. Of course, in this case as well, the male threaded portion 23
The threaded slope 24 on the center side of the joint rod 22
However, by contacting the end thread slope of the female threaded portion 25, further screwing movement of the joint rod 22 can be restricted.

The usage of the coupling device in this embodiment is similar to that in the previous embodiment, so a detailed explanation will be omitted.

In any of the above embodiments, the nut members 5, 25 and the swing regulating bodies 10, 28 are separate members, but they may be integrated. Although this integration slightly increases the material cost, it is advantageous in that the number of parts can be reduced and pressure-tight fitting to the pipe end can be performed all at once.

In addition to the corner supports of racks, this pipe connection device can also be used for poles such as clotheslines, flag poles, tent supports, furniture legs, etc.
It can be applied to various things.

Effects of the invention As described above, this invention provides a joint rod with a pair of externally threaded parts spaced apart in the axial direction, and in a connected state in which the end surfaces of the pipes are brought into contact with each other at the ends of the pipes. Since a nut member having a female threaded portion that is screwed into the male threaded portion is provided at a position corresponding to the male threaded portion of the joint rod, the pair of pipes can be connected by a simple screwing operation. Of course, since a swing regulating body having an insertion hole through which the joint rod is inserted is fixed at a position spaced apart from the female thread in the axial direction of the pipe, the screwing force is insufficient and the end surfaces of the pair of pipes Even when the pipes cannot be brought into close contact with each other and the two are only in slight contact, a strong connection between the pipes can be achieved. Therefore, the pipe connecting device according to this invention is suitable as a pipe connecting device used as a support for furniture such as knock-down racks that are often assembled by amateurs.

Moreover, since the female threaded part and the swing regulating body are provided at positions separated from each other, the force applied from the direction crossing the axial direction is applied to the threaded surface of the female and male threaded part, the joint rod, and the swing regulating body. This has the advantage that the joint strength is improved and the swinging of the pipe joint can be restricted. Furthermore, by distributing the force applied to the pipe to both the screwing surface and the swing regulating body side, the load on the screwing surface during long-term use is reduced.
Damage to the threaded surface can be effectively prevented.

[Brief explanation of the drawing]

FIG. 1 is an exploded, partially cutaway perspective view of a pipe connecting device according to one embodiment of the invention, FIG. 2 is a cross-sectional view of the main part of the same connected state, and FIG. 3 is a schematic view of another embodiment of the connected state. FIG. 4 is a partial sectional view, and FIG. 5 is a perspective view of an assembly rack using the pipe connecting device according to this invention.
The figure is a sectional view of a main part of a conventional rod-shaped body connection structure. 1... Pipe, 2, 22... Joint rod,
3, 23... Male thread part, 4, 24... Regulatory protrusion,
5, 25... Nut member, 5a, 25a... Female threaded portion, 8, 28... Rocking regulating body, 10, 30...
Insertion hole.

Claims (1)

[Claims for Utility Model Registration] (1) A pipe connecting device for longitudinally connecting a pair of pipes to be connected to each other via joint rods inserted into corresponding pipe ends, the joint A pair of male threaded parts are provided on the rod at intervals in the axial direction, and a female threaded part is screwed into the male threaded part on the pipe end in a connected state in which the end surfaces of the pipes are in contact with each other. a pipe swing regulating body having a joint rod insertion hole in which the joint rod is inserted and disposed at a position spaced apart from the female threaded portion along the pipe axis direction in the pipe end portion; A pipe connecting device characterized in that the pipe is fixedly installed. (2) The pipe connecting device according to claim 1, further comprising a regulating protrusion for regulating screwing movement of the joint rod at a symmetrical position in an axially intermediate portion of the joint rod.