JP3801422B2 - Pipe joint - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connecting member for connecting a plurality of pipes in a straight line when a pipe is used to construct a vinyl house, a temporary building, etc., and in particular, the bending strength at the connecting portion is improved. is there.
[0002]
[Prior art]
Since long pipes are difficult to transport, a plurality of short pipes are combined and used when long pipes are required.
[0003]
[Problems to be solved by the invention]
However, since the bending strength of the joint is weaker than the bending strength of the pipe itself, the joint is joined at a site where no bending moment acts.
[0004]
Therefore, the present invention has been conceived for the purpose of obtaining the bending strength at the joint portion of the pipe equal to the bending strength of the pipe itself.
[0005]
[Means for Solving the Problems]
The coupling member of the present invention includes an auxiliary pipe C having an outer diameter that can be inserted into the two pipes A and B to be coupled, a bolt 4 inserted into the auxiliary pipe, and an auxiliary pipe screwed from both ends of the bolt 4. A nut 1 for holding the bolt 4 in C, a bottomed cylindrical body with a plurality of cuts 31 in the axial direction, and two expansion sleeves 3 with holes 33 through which both ends of the bolt 4 are inserted in the bottom 32; This is an assembly of two truncated cone-shaped nuts 2 having a slope 21 inserted into the open end of the expansion sleeve 3 and a screw hole 22 into which a bolt 4 is screwed.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
As shown in the perspective view of FIG. 1, the connecting member of the present invention includes one auxiliary pipe C having an outer diameter that can be inserted into two pipes A and B to be connected, one bolt 4, It is constituted by two first frustoconical nuts 1 fitted on both sides of the auxiliary pipe C, two expansion sleeves 3, and two second frustoconical nuts 2.
[0007]
As shown in the perspective view of FIG. 3, the expansion sleeve 3 is a bottomed cylindrical body in which two notches 31 are inserted in the axial direction, and a hole 33 through which the bolt 4 is inserted is formed in the bottom 32. It has an outer diameter smaller than the inner diameter of the pipes A and B to be joined, and is made by pressing a metal plate such as an iron plate.
[0008]
As shown in the perspective view of FIG. 4, the first frustoconical nut 1 includes a slope 11 that is pressed into the opening of the auxiliary pipe C and a screw hole 12 into which the bolt 4 is screwed.
[0009]
The second frustoconical nut 2 has substantially the same shape as the first frustoconical nut 1, and includes a slope 11 that is pressed into the opening of the expansion sleeve 3 and a screw hole 12 into which the bolt 4 is screwed.
[0010]
When connecting the two pipes A and B with the connecting member configured in this manner, the bolt 4 is inserted into the auxiliary pipe C, and the first truncated cone nut 1 is screwed from both ends of the bolt 4. Then, as shown in FIG. At this time, the first frustoconical nut 1 does not need to be screwed in strongly, and may be tightened to such an extent that the auxiliary pipe C does not idle.
[0011]
Next, as shown in FIG. 2, after the expansion sleeve 3 is fitted into the bolts 4 protruding from both sides, the second frustoconical nut 2 is lightly screwed and assembled to complete the coupling member.
[0012]
When one of the two pipes A and B to be joined is inserted into one of the pipes, the auxiliary pipe C of the assembled coupling member is inserted into the length of about half, and the auxiliary pipe C is lightly turned. Since it rotates and is screwed into the second frustoconical nut 2 to expand the expansion sleeve 3, the coupling member can be temporarily fixed to one of the pipes.
[0013]
Next, when the connecting member protruding from one pipe is inserted into the other pipe, one of the pipes is fixed and the other pipe is turned by a pipe wrench, the expansion sleeve 3 rotates together with the pipes A and B. At the same time, the second frustoconical nut 2 rotates.
[0014]
Thus, when the two second frustoconical nuts 2 are rotated in opposite directions together with the expansion sleeves 3 on both sides, the distance between the two second frustoconical nuts 2 screwed into the bolts 4 is reduced, and the second The frustoconical nut 2 is pressed into the opening of the expansion sleeve 3 to expand the expansion sleeve 3, and is firmly pressed against the inner surfaces of the two pipes A and B to be joined.
[0015]
(Other embodiments)
In the embodiment described above, the first frustoconical nut 1 is fastened to the opening of the auxiliary pipe C. However, a stepped nut having a stepped portion entering the auxiliary pipe C may be used. .
[0016]
【The invention's effect】
As is apparent from the description based on the above embodiment, when the two pipes A and B are coupled using the coupling member of the present invention, they do not come off and the auxiliary pipe C exists in the coupling portion. Therefore, the bending strength of the joint portion is not inferior to the bending strength of the pipe itself to be joined.
[0017]
By connecting a large number of pipes continuously using the connecting member of the present invention, a long pipe with excellent bending strength can be easily obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an assembled state of a coupling member of the present invention,
FIG. 2 is a perspective view showing a state in the middle of assembling the coupling member of the present invention,
FIG. 3 is a perspective view showing an expansion sleeve used in the coupling member of the present invention;
FIG. 4 is a perspective view showing a frustoconical nut used in the coupling member of the present invention.
[Explanation of symbols]
A, B Pipe to be joined C Auxiliary pipe 1, 2 Frustum nut 3 Expansion sleeve 4 Bolt

Claims (1)

An auxiliary pipe having an outer diameter that can be inserted through the two pipes to be joined;
A bolt inserted into the auxiliary pipe and a nut screwed from both ends of the bolt to hold the bolt in the auxiliary pipe;
A cylindrical body with a plurality of notches in the axial direction, and two expansion sleeves with holes at the bottoms through which both ends of the bolts are inserted;
Two frustoconical nuts having a slope inserted into the open end of the expansion sleeve and a screw hole into which the bolt is screwed;
A connecting member for connecting two pipes, characterized by assembling.

Images