Head stack assembly for a disk drive having a plastic inner slee

Details Head stack assembly for a disk drive having a plastic inner slee Head stack assembly for a disk drive having a plastic inner slee

1998-01-05

1999-04-13

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

G11B 554, G11B 2108

Patent

active

058943820

ABSTRACT:
A magnetic disk drive with a head stack assembly includes a body portion, a coil portion cantilevered from one side of the body portion, and an actuator arm cantilevered to the opposite side of the body portion, wherein the body portion includes a plastic inner sleeve to provide a quick, press-fit connection with a pivot bearing cartridge. The body portion further includes a non-plastic outer portion which is preferably part of an aluminum E-block having integrally formed actuator arms. The plastic inner sleeve and non-plastic outer portion preferably include a spline and a recess, respectively, that are firmly compressed together by the press-fit connection to prevent relative angular motion. The plastic inner sleeve preferably includes a flat that is aligned with the spline and recess in order to contact the pivot cartridge along the flat and thereby ensure that the press-fit forces are focused onto the spline and recess. The preferred head stack assembly further includes a molding port at a rear portion of the non-plastic outer portion so that the plastic inner sleeve and a plastic overmold of the coil portion may be simultaneously formed and interconnected via the molding port, the molding port and plastic interconnection serving to prevent relative longitudinal motion.

REFERENCES:
patent: 5621590 (1997-04-01), Pace et al.
patent: 5818665 (1998-10-01), Malagrino, Jr. et al.

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