Patent ID: 6827659
Filing Date: 2004-12-07
Classification: A63B

Abstract:
A bat structure, comprising a central portion, two symmetrical opposite side enclosure portions, and two symmetrical opposite outer enclosure portions, wherein:the central portion has a substantially square cross-section and has four sides; the central portion includes a plurality of plates; the two opposite side enclosure portions and the two opposite outer enclosure portions are wound around the four sides of the central portion in a staggered manner; each of the two side enclosure portions includes a plurality of plates; the bonding faces between the plates of each of the two side enclosure portions are vertical to the bonding faces between the plates of the central portion; each of the two side enclosure portions has a hardness greater than that of the central portion; each of the two outer enclosure portions includes a plurality of plates; the plates of each of the two outer enclosure portions are laminated, pressed and bonded together to form each of the two outer enclosure portions; each of the two outer enclosure portions has a hardness greater than that of the central portion.