| 摘要 |
A magnetic disk cartridge has a plastic cartridge case which houses a magnetic disk. The magnetic disk is connected to a disk hub which projects through an opening in the bottom of the cartridge case. An upwardly extending tapered wall extends around the periphery of the opening, and a tapered plastic ring is attached to and encircles the disk hub. During non-use of the magnetic disk cartridge, a spring urges the disk hub downwardly so that the tapered plastic ring frictionally engages with the tapered wall with a wedging action to seal the clearance formed at the opening between the disk hub and the cartridge case. During use, the disk hub is displaced upwardly against the spring force to disengage the tapered plastic ring from the tapered wall and the disk hub is rotationally driven to rotate the magnetic disk.
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