Base plate with improved torque retention

Details Base plate with improved torque retention Base plate with improved torque retention

1997-11-07

1999-04-27

Hail, III, Joseph J.

Metal working

Method of mechanical manufacture

Electrical device making

2960304, 2960305, 2960306, G11B 5127

Patent

active

058966463

ABSTRACT:
A base plate is used to attach the head/gimbal assembly of a disc drive to an actuator arm. The base plate has a boss which fits into an opening in the actuator arm. In one embodiment, one of the inner surface of the opening in the actuator arm and the outer surface of the boss is constructed of polymer, and the other is constructed of metal. The base plate is secured to the actuator arm by swaging the raised portion of the base plate to the opening in the actuator arm. During swaging, the layer of polymer material yields to conform to the metal surface, thereby providing a swage connection with superior holding friction and retention torque. In another embodiment, the boss includes a plurality of raised portions defining a cylinder having a relaxed outer diameter greater than the inner diameter of the opening in the actuator arm. The outer surfaces of the plurality of portions engage the inner surface of the actuator arm to elastically deform and conform to and bias against the inner surface of the actuator arm, thereby providing a connection with superior holding friction, and retention torque.

REFERENCES:
patent: 3744008 (1973-07-01), Castellani
patent: 4796122 (1989-01-01), Levy et al.
patent: 5097584 (1992-03-01), Cain et al.
patent: 5124855 (1992-06-01), Dew et al.
patent: 5262911 (1993-11-01), Cain et al.
patent: 5444587 (1995-08-01), Johnson et al.
patent: 5471733 (1995-12-01), Bernett et al.
patent: 5657531 (1997-08-01), Sato et al.
patent: 5677815 (1997-10-01), Chan
patent: 5717545 (1998-02-01), Brooks, Jr. et al.
Hagenlocher, W. A., IBM Technical Disclosure Bulletin, Ball Staking of a Transducer Assembly Mounting Block to a Positioned Arm, vol. 18, No. 1, Jun. 1975, p. 226.

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