Mizuno Corporation

Mizuno Usa, Inc.

Toshiaki Kida

Kazuhiko Shindome

Yohei Yamashita

Michiharu Tsukamoto

Kazuya Ishida

Kazunori Misono

Yutaka Yamaguchi

Masao Ogawa

Kohei Kikuchi

Masaaki Okuyama

A softball or baseball bat with modified restitution characteristic is provided. The bat can comprise a substantially rigid core coupled with a single or multi-piece sleeve. The core can comprise a tip end, a barrel portion, a handle taper, and a handle. A sleeve assembly can be disposed over the barrel portion, and the sleeve assembly can comprise one or more materials capable of impact absorption. The sleeve assembly can include a ring portion positioned about a circumference of the barrel portion, an outer sleeve, and an inner sleeve disposed between the outer sleeve and the barrel portion.

Baseball or softball bat with modified restitution characteristics

A softball or baseball bat with modified restitution characteristic is provided. The bat can comprise a substantially rigid core coupled with a single or multi-piece sleeve. The core can comprise a tip end, a barrel taper, a handle taper, and a handle. The sleeve can slide over the handle portion and can be pressed, molded, or adhered to the barrel taper. The resilient sleeve can be sized and shaped such that the sleeve portion is substantially the same diameter as the tip end. The sleeve can comprise a material capable of impact absorption. The sleeve can have a composite structure with inner and outer sleeve components. The sleeve can further comprise a cone to taper the sleeve in the handle taper portion of the bat. The material and thickness of the sleeve and the core can be varied to meet applicable restitution requirements.

A softball or baseball bat with modified restitution characteristics is provided. The bat can comprise a substantially rigid shell coupled with a single or multi-piece insert. The shell can comprise a tip end, a barrel, a handle taper, and a handle. The insert can be press-fit or adhered to the inside of the barrel of the shell. The insert can be a single or multi-piece design and can be single or multi-layered. The insert can comprise a material capable of impact absorption. Portions of the insert can be separated from the shell with a separation layer to improve restitution in certain areas of the bat. The insert can also comprise multiple layers that are separated from each other with a separation layer to improve restitution in certain areas of the bat. The material and thickness of the insert and the shell can be varied to meet applicable restitution requirements.

A baseball or softball bat improved in repulsiveness while maintaining sufficient durability is obtained. The bat is a baseball or softball bat including a hitting portion, a tapered portion and a grip portion, and the hitting portion offers a hitting portion core as a core, an elastic body and an outer shell member. The elastic body is arranged on the outer periphery of the hitting portion core. The outer shell member is arranged on the outer periphery of the elastic body. The outer shell member includes outer shell member portions which are a plurality of portions elastically deformable independently of each other.

Baseball or softball bat

A baseball or softball bat having improved restitution characteristic and preventing degraded hitting feeling caused by vibration or impact at the time of hitting can be provided. The baseball or softball bat including a ball hitting portion, a tapered portion and a grip portion is provided with an outer circumferential member, an inner circumferential member and a non-adhesive portion. The outer circumferential member is a cylindrical member forming at least the ball hitting portion. The inner circumferential member is arranged on the inner circumferential side of the outer circumferential member. The inner circumferential member has a tip end of the inner circumferential member positioned opposite to a taper side end as an end portion on the side of the tapered portion, fixed to the outer circumferential member. The non-adhesive portion is arranged, for preventing adhesion between the outer circumferential member and an unfixed portion of the inner circumferential member other than the tip end portion of the inner circumferential member and including the taper side end, at least on a portion of a region where the unfixed portion of the inner circumferential member and the outer circumferential member are opposite to each other.

A ball-hitting portion is integrally coated with an elastic body, and thus a bat with durability that can carry the ball far can be obtained. The baseball or softball bat includes a tip portion, a ball-hitting portion, a tapered portion and a grip portion. A depression in the ball-hitting portion is integrally coated with the elastic body having a high rebound property value as a physical property. Thus, when hitting the ball, the elastic body will be compressed and deform, and energy loss due to the ball deformation will be suppressed. Moreover, the ball is carried additionally with a restoring force of the elastic body. Consequently, the bat has rebound property superior to a conventional one, and can carry the ball farther.

Baseball or softball bat, bat base member and elastic sleeve

A baseball or softball bat capable of increasing the hit distance of a ball and reducing the manufacturing cost can be obtained. A baseball or softball bat ( ) including a hitting portion ( ), a taper portion ( ), and a grip portion ( ) has a tubular member ( ) which includes an outer circumference plane ( ) extending from the hitting portion ( ) to the grip portion ( ) and an inner circumference plane ( ) located inside the outer circumference plane ( ) and extending from the hitting portion ( ) to the grip portion ( ), and a metal tubular member ( ) which is placed between the outer circumference plane ( ) and the inner circumference plane ( ) at least in the hitting portion ( ), the metal tubular member ( ) having a weak boundary layer ( ) formed on its surface.

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Osaka, Japan

Toshiaki Kida