JPS6313996A - Joint structure of fiber-reinforced plastic member - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a joint structure for fiber-reinforced plastic members.

[Prior Art] Conventionally, in order to connect members such as pipes and shafts made of fiber-reinforced plastic snacks that are subject to axial loads, a female screw la and a male screw are attached to the end of a vibrator l, as shown in Fig. 3(a). 1b and connect by screw connection, or ': 4S3 figure (b)
As shown in FIG. 2, there is a screw connection method in which the diameter of the end of the shaft 2 is enlarged to form a female thread 2a, and a rod 3 having a male thread 3b is screwed to the end of the shaft 2. There is a connection method that does not require screw processing. The latter method utilizes a fitting 4 shown in FIG. 4, which has a screw 4a at one end and a tapered portion 4b into which the shaft 3 to be connected is inserted at the other end. It has a configuration with a hole. This is a friction connection method in which the tapered hole is filled with resin 5, and then the shaft 3 is pushed in and hardened to connect.

[Problems to be Solved by the Invention] However, in the screw connection method, it is necessary to process a screw into the fiber-reinforced plastic member. The axial load is borne by the threaded portion, but since the shear strength of the member is low, there is a problem that the joint portion may break under fairly low stress. On the other hand, with the friction connection method, although the above-mentioned problems are solved, there is a problem of poor workability because it is necessary to inject and fill the resin at the construction site and wait for it to be fixed.

[Means and operations for solving the problem] A joint metal fitting having a tapered portion on the outer surface for converting axial force into circumferential force is fitted to the end of the fiber-reinforced plastic member by a filament winding method.

The axial force acting on the joint hardware is converted into a circumferential force by the outer tapered portion, and this circumferential force is borne by the wound filament, so a strong joint structure can be obtained.

[Example] An example of the present invention will be described with reference to FIG. In the figure, reference numeral 12 denotes a joint hardware, which has a tapered part 12a on its outer surface that becomes smaller in diameter toward both ends, the inner diameter of which is equal to the inner diameter of the fiber-reinforced plastic vibrator 11, and a female screw 12b is provided on the 1 side. It is being This joint hardware 12 is fitted into a mandrel of a filament winding device. Then, when manufacturing the vibe 11 by winding reinforcing fibers impregnated with resin around the mandrel using a filament winding device,
It is also wound on the joint hardware 12. By pulling out the mandrel after the resin hardens, the fitting hardware ■2 is attached to the end of the member 11.
is fitted.

In this way, the members 11 having the joint hardware 12 fitted at their ends are screwed together via the nipple hardware 13.

The axial force acting between the members 11 is distributed in the circumferential direction and the axial direction via the tapered portion 12a of the joint hardware.

The distributed axial force is transmitted to the nipple fitting 13 via the joint fitting 12.

Next, an example of connecting the metal rod 14 to the shaft member 11 will be explained with reference to FIG. The joint hardware 12 is fitted onto the end of the shaft member 11 in the same manner as in the above example. The end of the rod 14 is screwed to the female thread 12b of the fitting,
By locking with the lock nut 15, the rod 14 and the shaft member 11 are connected.

[Effects of the Invention] The present invention is as described above, and since the joint hardware is fitted to the end of the member by the filament winding method during the manufacture of the member, on-site construction is not required. Further, there is no need to process screws on the fiber-reinforced plastic member itself.

The axial force acting on the joint hardware is converted into a circumferential force by the outer tapered portion, and this circumferential force is borne by the wound filament, resulting in a strong joint structure.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing an embodiment of the present invention applied to a vibrator member and a shaft member, respectively;
FIGS. 3(a) and 3(b) are explanatory diagrams of different examples using the conventional screw connection method, and FIG. 4 is an explanatory diagram of an example of the friction connection method. DESCRIPTION OF SYMBOLS 11...Fiber-reinforced plastic member, 12...Joint hardware, 12a...Tapered part ram. Applicant's agent Patent attorney Takehiko Suzue No. 1 Mouth No. 2 Figure (a) (b) Figure 3? 1″S4 Diagram 1930, Month, Day, Commissioner of the Japan Patent Office, Black 1) Mr. Yu Akira, Indication of the case, Patent Application No. 1983-156214 2, Name of the invention, Joint structure for fiber reinforced plastic members 3, Person making the amendment. Related Patent Applicant (412) Nippon Kokan Co., Ltd. 4, Agent 5, Spontaneous Amended Specification %, -''+-・7 ・, -/ 7, Contents of the Amendment (1) Page 2, Line 19 of the Specification Correct "Plastic" written in "Plastic" to "Plastic".

Claims (1)

[Claims] A joint structure for a fiber-reinforced plastic member, in which a joint hardware having a tapered outer surface that converts an axial force into a circumferential force is fitted to an end of the fiber-reinforced plastic member using a filament winding method.