US5260847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sleeveless rotatable beryllium/aluminum actuator arm for a magnetic disc drive
Assignee: Maxtor Corp
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Filing: 1991-10-18
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Granted: 1993-11-09
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Expires: 2011-10-18
Abstract
Abstract A sleeveless rotatable beryllium/aluminum alloy actuator arm for a disk drive for a computer. A rotatable actuator for a magnetic disk drive for a computer is also described. The rotatable actuator includes a sleeveless beryllium/aluminum alloy arm, a suspension attached to a first end of the arm, a transducer attached to the suspension, and a voice coil attached to a second end of the arm.
Inventors
- 👤 David W. Basehore
- 👤 Frank I. Morris
- 👤 King L. Wong
- 👤 Paul J. Hack
- 👤 Leonard S. Bleininger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:20
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
48 words
A rotatable armset of an actuator having a sleeveless bore for rotating about a spindle of a disk drive for positioning a transducer radially across a disk of the disk drive, wherein the armset is a one piece unit entirely comprised of an alloy of beryllium and aluminum.
Claim 2
Dependent Claim
48 words
A rotatable armset of an actuator having a sleeveless bore for rotating about a spindle of a disk drive for positioning a transducer radially across a disk of the disk drive, wherein the armset is a one piece unit entirely comprised of an alloy of beryllium and aluminum.
Claim 3
Dependent Claim
32 words
The rotatable armset of claim 1, wherein the armset of the actuator is a one piece assembly having a body portion, a plurality of arms, and a rear set of brackets portion.
Claim 4
Dependent Claim
18 words
The rotatable armset of claim 2, wherein a bearing assembly is interposed between the bore and the spindle.
Claim 5
Dependent Claim
19 words
The rotatable armset of claim 3, wherein the alloy is comprised of four parts beryllium to one part aluminum.
Claim 6
Dependent Claim
15 words
The rotatable armset of claim 4, wherein the bearing assembly is comprised of steel bearings.
Claim 7
Dependent Claim
17 words
The rotatable armset of claim 5, wherein a voice coil is fixedly attached to the rear brackets.
Claim 8
Dependent Claim
23 words
The rotatable armset of claim 6, wherein the alloy of beryllium and aluminum has a modulus of elasticity of approximately 28×10 6 psi.
Claim 9
Dependent Claim
25 words
The rotatable armset of claim 7, wherein the alloy of beryllium and aluminum has a coefficient of thermal expansion of approximately 8 in/°F×10 -6 .
Claim 10
Dependent Claim
21 words
The rotatable armset of claim 8, wherein the armset has a moment of inertia of approximately 8×10 -6 kg·M 2 .
Claim 11
Dependent Claim
117 words
In a disk drive system, an actuator for movably positioning and supporting a transducer over a disk of the disk drive, wherein the actuator comprises: an armset comprised entirely of an alloy of beryllium and aluminum having a sleeveless bore for pivoting about a spindle; a bearing assembly interposed between the armset and the spindle; a flexible suspension coupled at one end to the armset; a transducer coupled to an opposing end of the suspension; a voice coil coupled to a set of brackets of the armset, wherein the voice coil and the brackets are placed opposite to the suspension and transducer, wherein a counter weight is not required to balance the armset relative to the bore.
Claim 12
Dependent Claim
117 words
In a disk drive system, an actuator for movably positioning and supporting a transducer over a disk of the disk drive, wherein the actuator comprises: an armset comprised entirely of an alloy of beryllium and aluminum having a sleeveless bore for pivoting about a spindle; a bearing assembly interposed between the armset and the spindle; a flexible suspension coupled at one end to the armset; a transducer coupled to an opposing end of the suspension; a voice coil coupled to a set of brackets of the armset, wherein the voice coil and the brackets are placed opposite to the suspension and transducer, wherein a counter weight is not required to balance the armset relative to the bore.
Claim 13
Dependent Claim
18 words
The actuator of claim 10, wherein the ratio of beryllium to aluminum of the alloy is approximately 4:1.
Claim 14
Dependent Claim
20 words
The actuator of claim 11, wherein the alloy has a thermal coefficient of expansion of approximately 8 in/°F×10 -6 .
Claim 15
Dependent Claim
20 words
The actuator of claim 12, wherein the armset has a moment of inertia of approximately 8×10 -6 kg·M 2 .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-08 | 1997-05-10 | 1997-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-08 | 2001-05-10 | 2001-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-08 | 2005-05-10 | 2005-11-09 | $7700.00 | Window Closed / Lapsed |