JPS6330873Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of pipe joints,
The purpose is to provide a pipe joint that is strong, lightweight, and easy to mold.

For example, fiber-reinforced synthetic resin pipes are used for the frames of wheelchairs, pipe furniture, etc. because they are preferably lightweight, but when connecting the pipe ends, so-called so-called kneaded short fibers are used to connect the ends of the pipes. Either use a pipe joint that is a synthetic resin molded product made from premixes, or cut the pipe ends diagonally, butt them together, wrap them with tape, and then apply and harden synthetic resin adhesive. However, the former lacks strength and tends to break at the joint when a load is applied, the latter requires a long working time, and metal pipe joints have the disadvantage of being too heavy. There was a major drawback.

On the other hand, it is also possible to wind glass fibers impregnated with synthetic resin using the so-called filament winding method and embed the fibers in the synthetic resin for reinforcement. These pipe joints have the disadvantage that uniform winding is impossible and demolding after molding is also difficult.

The present invention provides a strong and lightweight pipe joint without the above-mentioned drawbacks by adopting the structure described in the claims of the utility model registration.

The configuration of the illustrated example will be explained below.

The drawing shows the case of an L-shaped pipe joint,
The shape of the pipe joint may be any shape such as T-shape, cross-shape, Y-shape, or U-shape.

In the figure, the pipe fitting 1 has hollow straight cylindrical pipe fitting ends 2 and 3, and the center axis O-O
In one plane passing through the left piece 4 and the right piece 5
It is divided into. The divided left piece 4 and right piece 5 are made into one pipe joint by bringing the end faces 6, 7, which are mating edges, into contact with each other, and the abutted end faces 6, 7 are made into one pipe joint. 7 is not bonded with adhesive and is only brought into contact with it.

The left and right pieces 4 and 5 are individually compression molded or injection molded using a series of reinforcing woven fabrics such as glass cloth and carbo cloth, and synthetic resins such as unsaturated polyester resin and epoxy resin. The parts other than the end faces 6 and 7, which are the mating edges, are hollow.

FIG. 2 shows another embodiment of the pipe joint 8, in which the wall thickness of the pipe fitting end 10 inserted into the pipe 9 and the main body part 11 of the pipe joint 8 are made equal to achieve weight reduction. The fitting portion 1 between the tube fitting opening end 10 and the tube 9
2 may be glued with polyester, epoxy, urethane, etc. adhesive, or simply inserted,
It may be left in place.

FIG. 3 shows the tube fitting opening when a reinforcing tube 15 is inserted and glued into the inside of the tube fitting end 14 of a pipe joint 13 having the same structure as that shown in FIG. 1, and a tube 16 is fitted. This is intended to reinforce the end 14.

In FIGS. 2 and 3, reference numerals 17 and 18 indicate a series of reinforcing woven fabrics such as glass cloth and carbon cloth.

Furthermore, as mentioned above, the fiber-reinforced synthetic resin pipe joint according to the present invention is used to connect pipes that form the frames of wheelchairs, pipe furniture, etc., so in order to maintain its strength high, Figure 2 or 3
As shown in the figure, end wall surfaces 19 to 24 are integrally secured to the end portions of the tube fitting ends 2, 3, 10, and 14.

The present invention has the configuration described above, and the pipe joint is divided into two pieces, left and right, which are not bonded to each other, on a single plane passing through the center axis of the pipe joint, so that the pipe joint is L-shaped. Even if it is a complex shape such as T-shape, cross-shape, Y-shape or U-shape, it is extremely easy to mold and demold as a synthetic resin product embedded with a series of reinforcing woven fabrics such as glass cloth and carbon cloth. Since it is embedded with a series of reinforcing fabrics such as glass cloth and carbon cloth, it is extremely strong and also has the effect of being extremely lightweight.

Moreover, since the end portion has a straight cylindrical shape, the fitting with the pipe to be connected is tight, and the fitting strength can be increased. Further, since the end wall surface is fixedly formed at the end of the pipe fitting opening, sufficient strength can be obtained without bonding the left and right parts of the pipe joint to each other. Therefore, it is possible to maintain sufficient strength even when torsional force is applied to the frame of a wheelchair, etc., and in combination with the fact that the end portion is shaped like a straight cylinder to increase the fitting strength,
It is possible to improve the strength of a joint for a frame of a wheelchair or the like.

Note that if you want to increase the safety factor in terms of strength, you can do this by simply gluing the two pieces together.

Furthermore, as mentioned above, the two left and right parts of the pipe joint do not need to be glued to each other, so when they are glued together, the glue protrudes from the end faces of these two parts, which needs to be wiped off. Therefore, it is beautiful even without finishing, and the operation of fitting another tube to the end of the tube fitting opening can be easily performed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of one embodiment, and FIGS. 2 and 3 are half-cut sectional views showing pipe connection states in different embodiments. 1: Pipe joint, 2, 3: Pipe fitting end, 4: Left piece, 5: Right piece, 17: Reinforced woven fabric, O-O: Center axis line.

Claims (1)

[Scope of utility model registration request] Each end is a hollow straight cylindrical pipe fitting end, and the end wall surface is integrally fixed to the end portion of the pipe fitting port. It is divided into two pieces on the left and right that are not glued to each other on two planes, and each piece is made of a series of reinforcing woven fabric and synthetic resin, and is hollow except for the mating edges. A fiber-reinforced synthetic resin pipe fitting that is a molded product.