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Spindle Antistatic Brush

IP.com Disclosure Number: IPCOM000046700D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Brue, BM: AUTHOR [+3]

Abstract

The purpose of the disk drive antistatic brush is to ground the rotating spindle assembly of a hard file to allow any static charge build-up to drain off without creating a spark. The antistatic brush 5 in the figures is significantly different from that used in other files. The traditional design is to use a button in contact with a spherically shaped surface on the end of a shaft. This traditional design tends to produce acoustical noise. This occurs partly because the friction forces on the brush are multidirectional, resulting in a potentially unstable dynamic condition for the spring-mounted brush. This design eliminates the noise while maintaining function and wear requirements. In this design, the brush rides on the side of a rotating shaft 6 instead of on the end.

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Spindle Antistatic Brush

The purpose of the disk drive antistatic brush is to ground the rotating spindle assembly of a hard file to allow any static charge build-up to drain off without creating a spark. The antistatic brush 5 in the figures is significantly different from that used in other files. The traditional design is to use a button in contact with a spherically shaped surface on the end of a shaft. This traditional design tends to produce acoustical noise. This occurs partly because the friction forces on the brush are multidirectional, resulting in a potentially unstable dynamic condition for the spring-mounted brush. This design eliminates the noise while maintaining function and wear requirements. In this design, the brush rides on the side of a rotating shaft 6 instead of on the end. The forces on the brush 5 result in a stable dynamic condition. The materials used are the same as traditional brushes - a silver graphite brush and a stainless steel shaft. Other conducting materials could be used without affecting the acoustic noise properties; however, contact resistance and wear may be affected. The antistatic brush 5 and spring 7 are constrained within a cavity 9 in the antistatic housing and held in place by a cap 10 over the housing 12. Contact force on the shaft is maintained by the spring. The main aspect of this invention is that the brush rides on the side of the shaft instead of the end and that results in stable operation free of acoustic no...