JPS6021106Y2 - Crotske gateball ball - Google Patents

Description

[Detailed explanation of the invention] This invention improves the crotchet game and the rules and methods of this game so that it can be played both indoors and outdoors. It concerns the ball used.

If this seed ball is molded once with synthetic resin, deformation and striped patterns will occur due to the difference in cooling time between the center and the outer periphery, so as shown at 49 in Figure 1, half of the outer periphery of the core 11 is molded with synthetic resin 12. Then, wrap the remaining half with synthetic resin 13 to make a sphere, or hold the upper and lower surfaces of the core with a holder 14 and remove the other parts except for the holder, as shown at port 49 in Figure 2. There is one that is made into a ball by surrounding it with synthetic resin 15 and then filling the part supported by the holder with synthetic resin 16.

However, the former has the disadvantage that the central joint 17 has streaks and breaks when the ball is hit, and the latter also has the synthetic resin 16 part embedded in the part supported by the holder. It had the disadvantage that it fell short.

The present invention was devised to eliminate these drawbacks, and the radius of curvature R, which is larger than the radius of curvature r of the spherical core 1 made of synthetic resin, is provided at the upper and lower parts of the axis passing through the center O of the spherical core 1 made of synthetic resin. grooves 4 and 5 are formed on the outer peripheral edges of the protrusions 2 and 3, and a radius of curvature R is formed on the outer periphery of the spherical core 1 so as not to overlap the outer curved surface of the protrusions. This is a method for using a crotchet gateball characterized by covering the outer skin 6 made of synthetic resin with the same specific gravity as the spherical core, and fitting the upper and lower peripheral edges into the grooves 4 and 5.

As the synthetic resin, low pressure polyethylene, polypropylene, ABS resin, etc. are used.

The outer periphery of the spherical core 1 can be covered with the outer skin 6 by supporting the spherical core 1 in a mold using the protrusions 2 and 3 and injecting synthetic resin.

Since the present invention has such a structure, the spherical core and the outer skin are tightly and firmly fitted without causing the outer skin to crack or fall off as in conventional products.

In addition, compared to conventional products, the manufacturing process is simplified, the production cost is reduced, and the product can be provided at a low price.

[Brief explanation of the drawing]

49 in Figure 1 and 49 in Figure 2 are sectional views showing the conventional molding means and molded product, Figure 3 is a sectional view of the product of the present invention, and Figure 4 is a plan view of the spherical core. be. 1... Spherical core body, 2, 3... Protrusion part,
4, 5... Groove, 6... Outer skin.

Claims (1)

[Scope of utility model registration request] Protrusions 2 and 3 having a radius of curvature R larger than the radius of curvature r of the spherical core are formed on the upper and lower parts of the axis passing through the center 0 of the spherical core 1 made of synthetic resin, and the protrusions 2, A spherical core body 1 with grooves 4 and 5 formed on the outer peripheral edge of 3, excluding the outer curved surface of the protrusion.
A synthetic resin outer skin 6 having the same specific gravity as the spherical core body with a radius of curvature R is placed over the outer periphery of the spherical core body, and the upper and lower peripheral edges of the outer skin 6 are placed in the groove 4.
, Kurotsuke gateball usage characterized by biting into 5.