JPH0212873Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a rupture piece for the purpose of preventing breakage of the sleeve joint and the hollow tube in fishing net girders manufactured by fitting hollow pipes from both ends to the sleeve joint. This relates to fishing net girder using.

The applicant already owns a utility model right for fishing net girder. (Utility Model Registration No. 1420429) This invention relates to an improvement of the applicant's above-mentioned utility model. The above utility model provides fishing net girders with excellent strength, flexibility, and handling. However, when hollow tubes are fitted from both sides of the sleeve joint, the material used in both cases is fiber-reinforced plastic (FRP).
), if too much load is applied to the mesh girder, trouble will occur where either the hollow tube or the sleeve joint will break. If this problem occurs, for example, if the FRP net girder breaks during fishing operations such as trawling, it is impossible to repair it on the spot, so it is necessary to either postpone the work or always have spare parts of the net girder on hand. No.

The hollow tube may have any structure, but an integrally formed stepped sealed type is preferable.

The purpose of this invention is to prevent such troubles.For example, one side of the sleeve joint of a fishing net girder is manufactured by fitting a hollow tube made of FRP from both ends into a sleeve joint made of FRP. The contact area between the end and the hollow tube is also made of FRP, but because the material is thinner than the hollow tube or sleeve joint, the external force is smaller than the breaking stress of the sleeve joint or hollow tube. Destroying a fishing net girder using a rapture piece with a stepped hollow tube structure as shown in Figures 3 and 4, which is removably fitted into a sleeve joint or a hollow tube. This is what we provide.

According to the inventor's study results, sleeve joints,
When the hollow tube is FRP, the strength of the rupture piece is 60% the breaking stress of the hollow tube or sleeve joint by making the wall thickness of the FRP material thinner than that of the hollow tube or sleeve joint, which is also made of FRP. It is preferable to set it to ~80%; if it is less than 60%, the rupture piece will break frequently and it will take time to replace it.
Moreover, if it exceeds 80%, there is a risk that the hollow tube may be damaged in some cases.

The fishing net girder of the present invention has sleeve joints and hollow tubes that do not break, the rupture piece is removable, and it is a small molded product, so sufficient spare parts can be prepared. If the fishing net girder breaks, it can be easily replaced, which has the advantage of not causing any major hindrance to fishing operations.

Next, the present invention will be explained in detail with reference to the drawings.

Fig. 1 is a partially omitted sectional view of the mesh girder of the applicant's utility model registration No. 1420429, Fig. 2 is a partially omitted sectional view of an embodiment of the present invention, and Fig. 3 is a lap FIG. 4 shows a perspective view of only the earpiece, and FIG. 4 shows a sectional view of the same.

In the case of Fig. 1, there is a blind plug 3 inside the sleeve joint 2.
This is a hollow tube that has been sealed and fitted, and has excellent strength and flexibility, but if too much load is applied to the mesh girder, the sleeve joint or hollow tube will break. In the case of the present invention, since the rupture piece 4 is present at the contact point between the sleeve joint 1 and the hollow tube 2, even if too much load is applied to the mesh girder, the wall thickness is smaller than that of the sleeve joint 1 or the hollow tube 2. Since the wall thickness of the sleeve joint 1 is thinned to about 60 to 80% of the thickness of the sleeve joint 1, the rupture piece 4 only breaks.
Or the hollow tube 2 will not break.

Moreover, as is clear from FIG. 2, the rupture piece 4 is small and detachable, so that fishing operations can be carried out smoothly without requiring time to replace it with a spare part.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted sectional view of a conventional fishing net girder, and FIG. 2 is a partially omitted sectional view of an embodiment of the present invention. FIG. 3 is a perspective view of the rupture piece, and FIG. 4 is a sectional view thereof. 1...Sleeve joint, 2...Integrated sealed hollow tube,
3...Blind stopper, 4...Lapture peace.

Claims (1)

[Claims for Utility Model Registration] 1. A fishing net girder manufactured by fitting a hollow pipe into a sleeve joint from both ends. A fishing net girder using a rupture piece, which is formed by removably fitting a rupture piece into a sleeve joint or a hollow tube, which breaks with an external force smaller than the breaking stress of the hollow tube. 2 The breaking stress of the FRP stepped hollow tubular rupture piece against external force is
A fishing net girder using the rapture piece described in claim 1, which is a hollow tubular stepped cylindrical FRP whose wall thickness is about 60 to 80% that of an FRP sleeve joint.