Patent ID: 6851169

Claim:
A method for assembling a magnetic tape cartridge, the magnetic tape cartridge comprising: a reel wound with a magnetic tape and housed in a cartridge case including a lower flanged hub in which a lower flange of a disk-like plate is integrally molded with the outer circumference of a base plate of a cup-like hub; an upper flange of a disk-like plate which is fixed to the end of an opening of the cup-like hub; a fitting rib which projects from said upper flange around the inner circumference for centering said upper flange with said lower flanged hub; and a part of the magnetic tape cartridge, which is mounted near the inner surface of a cylindrical wall of said cup-like hub, said method comprising the steps of: mounting said part in said cup-like hub of said lower flanged hub; and fixing said upper flange on the end of the opening of said cup-like hub after said part is mounted in said cup-like hub.