Claims
- 1. A magnetic disk drive for storing data comprising:
- a drive motor including a shaft and a rotor rotationally mounted for movement relative to said shaft; a pair of ball bearing assemblies disposed intermediate said rotor and said shaft:
- a magnetic disk disposed on said rotor for rotation with said rotor relative to said shaft;
- a flange disposed on said rotor extending radially from said rotor and having a pair of planar faces;
- a first ring spatially fixed with respect to said shaft and disposed juxtaposed with one of said pair of planar faces of said flange;
- a second ring spatially fixed with respect to said shaft and disposed juxtaposed with the other of said pair of planar faces of said flange;
- said rings having a state of contraction in a direction perpendicular to said faces when influenced by an electrical potential and a de-energized state when not influenced by said electrical potential;
- a source of said electrical potential connected to said rings;
- an electrical switch intermediate said source and said rings to connect and disconnect said source and said rings;
- whereby said flange is disengaged by said rings when said electrical potential is applied to said rings; and said flange is engaged by said rings when said source is disconnected.
- 2. The magnetic disk drive of claim 9 wherein said direction of contraction of said first ring and said direction of contraction of said second ring are opposing and directed away from said flange and wherein said first and second rings are disposed in their contracted state.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a division of U.S. application Ser. No. 08/188,178, filed Jan. 28, 1994, now abandoned.
US Referenced Citations (13)
Foreign Referenced Citations (7)
Number |
Date |
Country |
55-70971 |
May 1980 |
JPX |
1-128274 |
May 1989 |
JPX |
311338 |
Jan 1956 |
CHX |
773707 |
Oct 1980 |
SUX |
1243026 |
Jul 1986 |
SUX |
462479 |
Mar 1937 |
GBX |
2187031 |
Aug 1987 |
GBX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
188178 |
Jan 1994 |
|