A - Human Necessities – 63 – B
Patent
A - Human Necessities
63
B
A63B 59/06 (2006.01) B29C 70/08 (2006.01) B29C 70/44 (2006.01)
Patent
CA 2306036
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 (1) including a hitting portion (2), a taper portion (3), and a grip portion (4) has a tubular member (6a, 6b) which includes an outer circumference plane (25) extending from the hitting portion (2) to the grip portion (4) and an inner circumference plane (26) located inside the outer circumference plane (25) and extending from the hitting portion (2) to the grip portion (4), and a metal tubular member (8) which is placed between the outer circumference plane (25) and the inner circumference plane (26) at least in the hitting portion (2), the metal tubular member (8) having a weak boundary layer (7) formed on its surface.
Ce bâton (1) de baseball ou de softball permet d'augmenter la distance en vol de la balle et coûte moins cher à produire; il comprend une portion de frappe (2) de balle, une portion effilée (3) et une portion de prise (4), et il est composé de matériaux de base tubulaires (6a, 6b), lesquels comportent une surface périphérique extérieure (25) s'étendant entre la portion de frappe (2) et la portion de prise (4) du bâton, ainsi qu'une surface périphérique intérieure (26) disposée du côté intérieur de la surface périphérique extérieure (25) et s'étendant entre la portion de frappe (2) et la portion de prise (4); un élément tubulaire métallique (8) est disposé au niveau d'au moins la portion de frappe (2), entre les surfaces périphériques extérieure et intérieure (25, 26), et il présente sur sa surface une couche d'interface (7) à faible résistance.
Ishida Kazuya
Kida Toshiaki
Misono Kazunori
Okuyama Masaaki
G. Ronald Bell & Associates
Mizuno Corporation
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