JPS6218768B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a synthetic resin pivot joint using molding technology.

In recent years, a wide variety of synthetic resin molded products have been used,
When configuring a joint that can rotate, the joint must have the same strength as the rod connected to the joint, so the joint becomes extremely large compared to the rod, especially for items that include joints such as interior goods. In some cases, it had drawbacks such as detracting from its aesthetic appearance.

It is an object of the present invention to eliminate the above-mentioned drawbacks, and to provide a pivot joint that is configured in a similar shape to a rod portion, has sufficient tensile strength commensurate with the rod portion, and has an aesthetic appearance. This paper proposes a method for molding such a rotation joint.

Now, one embodiment of the present invention will be described with reference to the drawings.
The sectional view taken along the line A--A in the figure and FIG. 3 are perspective views that are virtually exploded (actually cannot be disassembled).

The ends of the joint part 1 are processed and molded into hooks, connecting rings, bolt processing ends, etc., depending on the purpose.
A male side rod part 2 and a female side rod part 3 made of hard synthetic resin such as PC resin are rotatably connected with sufficient strength. A rotating shaft 5 having a smaller diameter than the base rod 4 is continuous at the end of the male side rod 2, and a spherical locking end 6 having a larger diameter than the rotating shaft 5 is integrally molded at the tip. . Reference numerals 7 and 7 denote a hemispherical shell portion 8 having an inner diameter slightly larger than the diameter of the locking end 6, and the hemispherical shell portion 8.
an insert member made of a synthetic resin of the same quality as the male rod part 2 and the female rod part 3, comprising a semi-cylindrical part 9 that is continuous with the rotary shaft 5 and has an inner diameter slightly larger than the outer diameter of the rotating shaft 5; When the two insertion members 7, 7 are placed over the locking end 6 of the male side rod portion 2 and the rotation shaft 5, the hemispherical shell portions 8, 8 in both insertion members 7, 7 , the locking end 6 is rotatably prevented from being pulled out. Reference numeral 10 denotes a covering bulb part that is integrally molded with the base rod 11 of the female side rod part 3, and a covering cylinder part 12 is integrally molded continuously with the covering bulb part 10. This part is insert-molded with two insertion members 7, 7 covering the rotation shaft 5 and locking end 6 of the male side rod part 2, and the hemispherical shell parts 8, 7 of the insertion members 7, 7. 8, and the covering cylinder part 12 is located in each of the semi-cylindrical parts 9, 9, respectively, and the insertion members 7, 7 are fitted into both the covering parts 10, 12. become a state.

In this state, the joint part of the male side rod part 2 is rotatably supported with respect to the insertion members 7, 7 without being pulled out, so it cannot be rotated with respect to the joint part of the female side rod part 3. The two rod parts 2 and 3 have a joint part 1 which can be freely rotated.

Next, an example of a method for manufacturing a rotary joint will be described with reference to FIGS. 4 and 5.

() Fig. 4 is a front view of the male side rod part 2 made of synthetic resin, and a locking end is attached to one end of the base rod 4 via a rotation shaft 5 by a molding method such as injection molding or compression molding. 6 is integrally molded.

() Next, a synthetic resin insert member 7 consisting of a hemispherical shell part 8 and a semicylindrical part 9 is molded, and is placed over the connecting part molded in the above process, and is then inserted into the upper mold and the lower mold as shown in FIG. The connecting part of the male side rod part 2 covered with the insert members 7, 7 is positioned in the connecting part of the female side rod part form a formed by insert molding, and the female side rod part 3 made of synthetic resin is constructed by insert molding. The covering bulb part 10 and the covering cylinder part 12 that cover the insert members 7, 7 are integrally molded continuously on the base rod 11. () When the female side rod part form a is removed, the shape shown in Fig. The rotation joint 1 is then molded.

As described above, in the joint part 1 molded in this way, the insertion members 7, 7 are fixed and integrally formed due to the molding of the female side rod part 3, but since the insertion members 7, 7 do not melt. , rotation of the joint between the insertion members 7, 7 and the male rod portion 2 remains secured.

Further, in this embodiment, the insertion member 7 is divided into two parts, but the same effect can be obtained even if the insertion member 7 is divided into multiple parts.

As explained above, the synthetic resin rotation joint of the present invention has an extremely simple structure and the joint part does not become large, so it is not long enough to provide a rotation joint with a smart feel, and the manufacturing method is extremely simple. and
In addition, since it can be applied to all kinds of joint mechanisms, the effects of implementing the present invention are enormous.

[Brief explanation of the drawing]

The drawings show an embodiment of the rotary joint of the present invention and its manufacturing method, and FIG. 1 is a front cross-sectional view of the rotary joint, and FIG.
The figure is a sectional view taken along the line A-A in Figure 1, Figure 3 is an exploded perspective view of the joint, Figures 4 and 5 show each manufacturing process, and Figure 4 is the female side rod. FIG. 5 is a front view of the male rod portion held for insert molding into the male rod mold. 1...Joint part, 2...Male side rod part, 3...Female side rod part,
4, 11... Base rod, 5... Rotating shaft, 6... Locking end, 7...
Insert member, 8... hemispherical shell part, 9... semicylindrical part, 10...
Covering sphere part, 12... Covering tube part, a... Female side rod part formwork.

Claims (1)

[Claims] 1 The tip of the synthetic resin base rod has a large diameter,
Further, a rotation shaft having a locking end that is symmetrical about the central axis is integrally molded, and the inner surface includes the locking end so as to be rotatably covered with respect to the rotation shaft including the locking end. A synthetic resin insert member made of the same material as the base rod, which is divided into two or more parts having similar shapes slightly larger than the external cross section of the rotating shaft, is separately molded, and the insert member is placed over the rotating shaft. In this state, place the insertion member at the joint part of the mold for molding another base rod, and at the same time as molding another base rod made of the same synthetic resin as the base rod, insert the insertion member into the mold. A rotary joint characterized in that one end is insert-molded, and the rotation shaft of the base rod is rotatably connected in the insert member, and both base rods made of the same synthetic resin are rotatably connected. manufacturing method.