Base plate for suspension assembly in a hard disk drive with a hardened flange and soft hub

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5833777
SERIAL NO

08931802

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A base plate for a suspension assembly in a hard disk drive wherein the base plate has a hardened flange and soft hub. The base plate is stamped in a progressive die in a sequence of forging and coining operations. The base plate is subsequently fully annealed to allow the material to yield at a low stress level so that the hub will create a press fit against the inner wall of an actuator arm boss hole. The base plate is passed through a secondary coining operation following the annealing step to work-harden the flange portion only. The result is a base plate with a flange portion that is hardened and a hub portion that is softer than the flange portion. The advantage is that the hardened flange is more resistant to deformation of a load beam welded thereto and the hub is more disposed to plastically deform and harden during swaging which is desirable for maintaining a press fit.

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Patent Owner(s)

Patent OwnerAddress
BANKBOSTON N A AS AGENT (F/K/A/ THE FIRST NATIONAL BANK OF BOSTON AS AGENT)100 FEDERAL STREET BOSTON MA 02110

International Classification(s)

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  • 1997 Application Filing Year
  • C21D Class
  • 127 Applications Filed
  • 83 Patents Issued To-Date
  • 65.36 % Issued To-Date
Click to zoom InYear of Issuance% of Matters IssuedCumulative IssuancesYearly Issuances1997199819992000200120022003200420050255075100

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hanrahan, Kevin Santa Barbara, CA 74 4631
Schmidt, Ryan Santa Barbara, CA 70 1858

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Patent Citation Ranking

  • 3 Citation Count
  • C21D Class
  • 9.30 % this patent is cited more than
  • 27 Age
Citation count rangeNumber of patents cited in rangeNumber of patents cited in various citation count ranges8706201 - 1011 - 2021 - 30051015202530354045505560657075

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