Patent ID: 6926630

Claim:
A seaming structure for use in baseballs and softballs comprising: two covers including a first cover and a second cover which close a ball core; each of the covers having two ends with a large round portion at each end and a middle portion connected to the two round portions that is narrowed; a first seaming wire seaming the two covers; the first seaming wire having a first diameter, the first seaming wire alternatively passing through the two covers, that is, the first seaming wire is arranged from a first side of the first cover to a second side of the first cover and then entering to a second side of the second cover to a first side of the second cover and then to the first side of the first cover; the process being repeated until the edges of the two covers being seamed; two upper seaming wires, and two lower seaming wires serving to seam the two covers; each of the upper seaming wires being arranged at an upper edge of one respective cover and being confined by a surface of the respective cover and the first seaming wire; each of the lower seaming wires being arranged at a lower edge of one respective cover and being confined by a surface of the respective cover and the first seaming wire; the upper seaming wires and lower seaming wires being made of wires with larger diameters than the first diameter; thereby, the seaming portions of the covers are formed as protrusions; wherein the edge of each cover is in contact to a surface of the ball core so as to separate the two upper seaming wires and two lower seaming wires.