Japanese Patent JPS6334141

Y2

A magnetic recording disk cartridge comprises a recording disk having a circular recording medium and a hub secured thereto, and a casing for accommodating the recording disk. The cartridge is provided with a hub lock for preventing rotation of the recording disk and closing a magnetic head receiving opening in the casing when the cartridge is not in use. The hub is provided with a plurality of axially extending engaging grooves on the peripheral surface thereof, and the base wall of the casing is provided with a plurality of inwardly projecting walls spaced from each other along the periphery of the hub opening for permitting a drive shaft to have access to the hub. The hub lock comprises a hub locking member having an annular bearing portion which slidably engages the inwardly projecting walls for rotation thereabout, a shutter portion integrally extending from the bearing portion and an engaging portion formed integrally with the bearing portion to resiliently project toward the hub, and an operating member for swinging the hub locking member about the central axis of the hub between an operative position in which the shutter portion closes the magnetic head receiving opening and the engaging portion projects toward the hub through the space between the adjacent walls beyond the inner surface of the wall to engage with the engaging grooves of the hub, and an inoperative position in which the shutter portion is retracted from the magnetic head receiving opening to open it and said engaging portion is disengaged from the engaging grooves of the hub whereby the disk is free to rotate.

JP12462782U

September 09, 1988

August 18, 1982

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G11B23/03; G11B17/04; G11B23/033; (IPC1-7): G11B23/03

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