Title:
BALL
Document Type and Number:
WIPO Patent Application WO/2023/120441
Kind Code:
A1
Abstract:
Provided is a ball with excellent durability, wear resistance, grip, or control property, and more particularly, a ball suitable for water polo. The ball according to the present invention is a ball that is hot-vulcanized in one piece, having a tube, a fiber-reinforced layer covering the tube, and a surface layer covering the fiber-reinforced layer, wherein the surface layer comprises a foam rubber having a coefficient of static friction from 0.35 to 0.7 and a coefficient of dynamic friction from 0.35 to 0.7. The coefficients of static and dynamic friction herein are based on ball-on-disk friction testing using a sample silicon sphere immersed in water.
Inventors:
HAMAMOTO AKINORI (JP)
SHIMOISHI REO (JP)
MURATANI HIROSHI (JP)
YOKOYAMA TORU (JP)
OGAWA RYUTARO (JP)
KUNISHIMA TOSHIMASA (JP)
TAKENOSHITA MAKOTO (JP)
SHIMOISHI REO (JP)
MURATANI HIROSHI (JP)
YOKOYAMA TORU (JP)
OGAWA RYUTARO (JP)
KUNISHIMA TOSHIMASA (JP)
TAKENOSHITA MAKOTO (JP)
Application Number:
PCT/JP2022/046545
Publication Date:
June 29, 2023
Filing Date:
December 16, 2022
Export Citation:
Assignee:
MIKASA CORP (JP)
International Classes:
A63B41/08; A63B41/10
Foreign References:
| US20160271457A1 | 2016-09-22 | |||
| US4881276A | 1989-11-21 | |||
| JP2012139453A | 2012-07-26 | |||
| US20020098927A1 | 2002-07-25 |
Other References:
CHUA JULIAN: "Water-Polo Research at RMIT", SPORTS TECHNOLOGY BLOG, 30 January 2013 (2013-01-30), XP093074529, Retrieved from the Internet
Attorney, Agent or Firm:
TSURUKAME Kuniyasu (JP)
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