JPS6118302Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a pipe joint made of a metal material and a synthetic resin material, and more specifically to a composite pipe joint in which one side is a joint with a metal pipe and the other is a joint with a synthetic resin pipe. It is something.

The applications of pipe fittings made of synthetic resin materials are increasing as the field of application of synthetic resin pipes expands.
Plastic pipe joints are suitable for connecting synthetic resin pipes. Figure 1 shows a nut part 1a and a male thread part 1b.
FIG. 2 is a side view with the upper half of the synthetic resin pipe joint 1 cut away, and screwing is performed by gripping and rotating the nut portion 1a. In this case, there will be no problem if the other end of the screw connection is made of the same synthetic resin, but if it is connected to something with high hardness such as a metal faucet or valve, even a slight dimensional error will be unreasonable. If it is screwed into the male threaded portion 1b, cracks or cracks may occur in the male threaded portion 1b. Furthermore, when the nut part 1a is gripped and rotated with a monkey wrench, adjustable spanner, etc., the nut part 1a may be worn out or damaged, and in the end, the synthetic resin joint 1 as shown in Fig. 1 is screwed to the metal joint. It is not recommended to
On the threaded joint side, the metals are screwed together, and on the non-threaded side, the flange type joint with a gasket, etc. is interposed, and the metal pipe joint part and the synthetic resin joint part are directly connected by means such as a sealing rubber gasket. I try not to join them. However, this method requires the use of special equipment as the joining member, and has the disadvantage that the joint is bulky.

The present invention was developed with attention to these circumstances, and its purpose is to not only safely join metal pipes and metal products and improve their own strength, but also to improve the strength of the joints. The purpose is to provide a pipe joint that does not complicate the structure.

The structure of the present invention that achieves this purpose is that the male threaded part and the hexagonal nut part for latching the rotary gripping tool are continuously formed of the same metal material, and the inner periphery of the threaded part and the hexagonal nut part is The entire socket part is formed from a synthetic resin material from the side, and the periphery of the contact area between the hexagonal nut part and the synthetic resin material is formed into a non-perfect circular shape, so that the metal material and the synthetic resin material cannot rotate. The gist is to become. Therefore, when the other party to be connected is a metal pipe or metal product and is to be screwed to these, the contact surface can be screwed with the same metal material, so the joint (especially the threaded part) There is no risk of cracking or damage. Furthermore, since the nut part is made of metal, wear and damage to the nut part hardly occur. The pipe fitting of this invention has a male thread on one side, but the other shape can be thread type, flange type,
It doesn't matter whether it is a socket type or an insertion port type, it can be structured to prevent both elements from rotating independently in the circumferential direction, or shaped to prevent both materials from separating in the axial direction, or even It is left to the discretion of the person implementing the present invention to adopt a shape that prevents separation due to differences in coefficient of thermal expansion or thermal strain, etc., and does not depart from the technical scope of the present invention. .

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure and effects of the present invention will be explained below based on drawings which are examples.

FIG. 2 is a side view of the upper half of the pipe joint according to the present invention, in which the pipe joint 10 is manufactured by the so-called insert molding method in which a synthetic resin material is injected into a mold containing a metal material. The resin material 3 and the metal member 2 are integrally formed. The metal member 2 constituting one side end is integrally provided with a nut portion 2a and a male screw 2b, and the synthetic resin material 3 constituting the other side end has a socket 3a having a tapered portion 3b and a stopper 3c. is formed. Since the pipe joint 10 is formed in this manner, for example, the side to be screwed to a valve etc. can be screwed into the male threaded part 2b, and the side to be connected to a synthetic resin pipe can be screwed into the tapered part 3b. Just insert and join the insertion tube. In this way, if the pipe joint 10 of the present invention is applied, the contact surfaces at each joint are made of metal materials or synthetic resin materials of the same quality, so the mechanical properties of both materials become close and excessive concentrated stress is prevented. There is no risk of cracking or damage to the joint. In addition, in the joint shown in the figure, synthetic resin material 3
is connected to the tongue edge 2c, the engaging part 2d, and the inner cavity 2e in a complicated manner, but as shown in FIG. If the nut part 2a is formed to have a shape similar to the outer shape of the nut part 2a, the thickness of the nut part 2a will be the same over the entire circumference, and the nut part 2a will not follow a circular rotation trajectory, so that the metal member 2 and the synthetic resin material 3 and do not rotate with respect to each other, and the rotational behavior is exactly the same.
Of course, the unevenness to prevent both materials 2 and 3 from rotating as a whole may be provided on any part of the inner wall of the metal member 2, such as on the inner surface of the male threaded portion 2b, It can also be provided over the entire circumference. Further, its shape is not limited to the illustrated example. For example, as shown by the imaginary line in Fig. 3, it may be partially provided with a flat surface that is not a curved surface, and the point is to maintain the metal material and the synthetic resin material integrally and non-rotatably. If it is formed, the effect of the present invention will be even more remarkable.

By the way, the tongue edge part 2c and the engaging part 2d in FIG.
Although this prevents the metal member 2 and the synthetic resin material 3 from coming apart in the axial direction, this function itself can also be obtained by the inner cavity 2e, so it may be omitted.
However, the metal member 2 and the synthetic resin material 3 have different properties against heat, and the latter has the property of shrinking (deforming) due to heat. There is a possibility of leaving. In such a case, it is advantageous that the tongue edge 2c and the engagement 2d can prevent the synthetic resin material 3 from shrinking. Furthermore, it is possible to cope with the difference in coefficient of thermal expansion between the two members. Furthermore, it is also possible to adopt a configuration in which the buried portion of the tongue edge portion 2c is formed to have an arbitrary length and shape along the axis of the synthetic resin material 3, thereby further improving the integrity of both members. As mentioned above, the socket made of synthetic resin material 3 may have any shape as long as it can be joined to a pipe or product made of synthetic resin. FIG. 4 explains the usage state of the pipe joint formed in this way. For example, when a metal valve is interposed in a conduit formed of a synthetic resin pipe, the pipe joint 10 and the valve 4 are connected to each other. For continuation, use the adjustable spanner 5 etc. to tighten the metal nut part 2.
The pipes are joined by gripping and rotating the joint a, and if the entire body was made of synthetic resin as in the past, it would not have been possible to strongly tighten the wrench, but with the joint of the present invention, the screws can be tightened. Safe joining can be performed without worrying about cuts or the like. The most suitable method for manufacturing such a pipe joint is the injection molding method, in which resin is injected into a mold that holds the metal member 2 in advance, as described above, but the manufacturing method is of course not limited; However, this invention is not limited to this invention.

Since the present invention is constructed as described above, the nut portion and the male threaded portion are not damaged during screw connection, and the structure of the joint portion is not complicated. Therefore, a high-strength joint can be obtained with a simple configuration, and it will greatly contribute to the field of joining metal pipes or metal products and synthetic resin pipes.

[Brief explanation of the drawing]

Fig. 1 is a side view with the upper half cut away of a known pipe joint, and Figs. 2 and 3 show an embodiment of the present invention; Fig. 2 is a side view with the upper half cut away, and Fig. 3 is a side view with the upper half cut away. is A-
A sectional view taken along line A and FIG. 4 are perspective views showing the state of use of the present invention. 1, 10...Pipe joint, 2...Metal member, 2a...
...Nut part, 2b...Male thread part, 3...Synthetic resin material.

Claims (1)

[Scope of utility model registration request] A pipe joint consisting of a metallic male threaded part and a synthetic resin pipe socket part, in which the male threaded part and the hexagonal nut part for latching the rotary grip are continuously formed of the same metal material, and the male The entire socket part from the inner peripheral side of the screw part and the hexagonal nut part is formed of a synthetic resin material, and the periphery of the contact part between the hexagonal nut part and the synthetic resin material is formed into a non-perfect circular shape, so that the metal material and the synthetic resin are formed in a non-perfect circular shape. A pipe joint characterized in that it is configured such that it does not rotate.