JPH0420026Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a hollow molded body having pinch-off portions at both ends thereof.

BACKGROUND OF THE INVENTION Hollow molded objects, such as toys such as bats, are formed by blow molding synthetic resin.

Problems to be Solved by the Invention The above-mentioned hollow molded body has pinch-off portions at both ends thereof, which are cut-off portions with the parison. Since the synthetic resin is cut away at this pinch-off part, the wall is thin, and there is a drawback that if the member is subjected to an impact such as a bat, it will break at the pinch-off part.

Means and Effects for Solving the Problems The present invention has been made in view of the above, and in a hollow molded body having pinch-off portions at both ends, a solid shaped body protruding outward at at least one end of the hollow molded body. By creating a hollow molded body with a protrusion and a pinch-off part formed on the outside thereof, and a pinch-off part extending from both ends of the protrusion to a part of the hollow molded body, the number of joints at the pinch-off part of the hollow molded body can be increased and joined. It has high strength and has pinch-off parts at both ends of the protrusion, so it has particularly high strength against impact.

EXAMPLE The present invention will be explained based on the drawings. 1 is a toy butt which is an embodiment of the hollow molded body according to the present invention. The bat 1 is blow molded from synthetic resin such as polyethylene or polypropylene. The butt 1 comprises a hollow main body 2, a grip end 3 forming a surface perpendicular to its longitudinal direction at one end, and a tip 4 having a curved surface projecting outward at the other end. Ru. Grip end part 3
The tip portion 4 has V-shaped protrusions 6, 6' that protrude outward on the parting line 5, and the protrusions 6, 6' are solid. The pinch-off portion 7, which is a cutout portion of the synthetic resin, is formed by the protrusions 6, 6'.
Pinch-off parts 7a, 7a' at the V-shaped tip of the holder, pinch-off parts 7b, 7b' at both ends of the protrusions 6, 6', and pinch-off parts 7c, 7c' which are continuous over a part of the grip end 3 and the tip 4. It is configured.

The side wall portion 3a connected to the vertical end surface of the grip end portion 3 has a curved surface, and the pinch-off portion 7b at the end portion of the grip end portion is formed in a shape corresponding to the radius of curvature of this curved surface.

On the other hand, the pinch-off portions 7b' at both ends of the protrusion 6' of the tip 4 are formed in a curved shape corresponding to the curved shape of the tip 4. Reference numerals 8 and 8' indicate waste burrs generated during blow molding, which are removed after molding to form a hollow molded body.

The toy bat 1 according to the above embodiment receives the impact generated when hitting a ball at the main body part 2 and deforms itself to withstand the impact, but at this time, the tip part 4 also deforms at the same time and becomes parting. A force is generated around the line that tries to pull the pinch-off part apart.
Further, when the bat 1 is thrown, an impact is applied to the grip end portion 3 and the tip portion 4, which also tends to cause cracks. However, butt 1 has protrusion 6,
Pinch-off parts 7a, 7a', protrusions 6,
Pinch-off parts 7b, 7b' on both sides of the grip 6', and pinch-off parts 7 on the grip end and the tip 4.
Since c and 7c' are arranged in series, they can sufficiently withstand the above-mentioned pulling force and can be used for a long period of time. Also, the protrusions 6, 6'
Both ends are the side wall portion 3 of the grip end portion 3 of the butt.
Since it has a curved shape that corresponds to the curved shape of the tip portion a and the tip portion 4, it is safe to use without causing any harm to the human body. In addition, since the protrusions 6 and 6' have a V-shaped shape that protrudes outward, the synthetic resin moves actively within the protrusions during blow molding, activating the synthetic resin within the protrusions and increasing the bonding strength. is extremely high.

Effects of the invention Since the present invention is configured as described above, it is possible to increase the joint strength of the pinch-off part of the hollow molded body by increasing the joint strength, and to prevent the pinch-off part of the hollow molded body from cracking due to impact, so that it can be used for a long period of time. It has the effect of withstanding use.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view of a butt which is an embodiment of the hollow molded article of the present invention, Fig. 2 is a perspective view of the grip end part of Fig. 1, Fig. 3 is a perspective view of the tip part of Fig. 1, FIG. 4 is a sectional view taken along the line AA of the tip of FIG. 1. DESCRIPTION OF SYMBOLS 1...Hollow molded body, 2...Main body part, 3...Grip end part, 4...Tip part, 6...Protrusion.

Claims (1)

[Scope of utility model registration request] In the hollow molded body having pinch-off parts at both ends, at least one end of the hollow molded body has a solid protrusion projecting outward, and the pinch-off part is formed on the outside of the solid protrusion, and one part of the hollow molded body is formed from both ends of the protrusion. A hollow molded article characterized in that a pinch-off portion is formed over the portion.