Dynamic magnetic information storage or retrieval – Head mounting – For shifting head between tracks
Reexamination Certificate
1999-03-08
2001-03-20
Evans, Jefferson (Department: 2754)
Dynamic magnetic information storage or retrieval
Head mounting
For shifting head between tracks
C360S097010, C360S265600
Reexamination Certificate
active
06205004
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a hard disk drive (HDD), and more particularly to an actuator and cover fixing device in the HDD, which concurrently assembles the actuator and the cover on a body base of the HDD by a single pivot screw.
2. Description of the Related Art
Fixing devices have been used in past for fixing a cover and a base in HDD and pivotally fixing an actuator assembly on the base. Typically, fixing devices fix the cover and the base by screws or fixedly mount the actuator assembly on the base by screws. With these conventional fixing devices, assembling processes are very complicated and fixing devices are not suitable for precision and dust free purposes. I have therefore found that it is impossible to correct or otherwise improve the conventional process in order to get a more convenient and precise fixing device.
U.S. Pat. No. 5,270,887 for A Compact Disk Drive Head Disk Assembly With Conformable Tape Seal issued to Edwards et al., discloses an assembly having a cover and a base. The cover is mounted to the base through screws engaging matching thread openings in the base. One of the screws is connected to a engaging matching threaded opening of a post of the base. The actuator assembly is mounted on the base through the post matching cylindrical opening in the actuator. The post has an inner post rigidly mounted to the base and an outer sleeve freely rotatably coupled to inner post through a ball bearing and race assembly. I have noticed that this assembly has several defects that the actuator and post can not be assembled precisely and perfectly.
U.S. Pat. No. 5,568,341 for a Magnetic Disk Drive Sealing Structure Having A Soft Elastic Member Bonded to A Core Member issued to Shikano, discloses a magnetic disk drive sealing structure with an actuator assembly rotatably mounted on a pivot shaft and a cover firmly secured to the base housing by screws. This reference uses a pivot shaft and two screws to secure both the cover and the base; therefore, this structure is very inconvenient and more complicated to assemble.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a device for simultaneously assembling an actuator and a cover on a body base with a single pivot screw in an HDD.
It is another object of the present invention to provide a device for simultaneously assembling an actuator and a cover on a body base with a single pivot screw having a cross screw driver recess on the head thereof in an HDD in order to protect a head and a disk against a shock and prevent assembly failures when the pivot screw is inserted.
It is an yet another object of the present invention to provide a single pivot screw having a cylindrical portion preventing from breakage even at an excess torque when the pivot screw is inserted.
It is still another object to provide a single pivot screw having a screw thread portion to be inserted into a screw hole of a boss formed on the base.
It is still yet another object to provide a fixing device with a cylindrical ring receiving the cylindrical portion of the single pivot screw.
It is also an object to provide a fixing device with a pivot bearing having an outer sleeve received by an opening of the actuator assembly and an inner sleeve fit around both the boss and the cylindrical ring to mount the actuator assembly pivotally on the boss of the base.
It is further object to provide a fixing hole formed in a cover receiving the single pivot screw.
It is further another object to provide a pivot screw tightening into the screws hole of the boss through the fixing hole of the cover and the cylindrical ring to fix the actuator and the cover simultaneously on the base by the pivot screw.
REFERENCES:
patent: 4945435 (1990-07-01), Boigenzahn et al.
patent: 5216662 (1993-06-01), Stefansky et al.
patent: 5270887 (1993-12-01), Edwards et al.
patent: 5568341 (1996-10-01), Shikano
patent: 5583721 (1996-12-01), Kim
patent: 5754372 (1998-05-01), Ramsdell et al.
patent: 5864441 (1999-01-01), Coffey et al.
Bushnell , Esq. Robert E.
Evans Jefferson
Samsung Electronics Co,. Ltd.
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