US3838464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retaining ring for magnetic disc pack assembly
Assignee: Nashua Corp
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Filing: 1972-10-24
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Granted: 1974-09-24
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Expires: 1992-10-24
Abstract
Abstract An improved annular retaining ring in a rotating disc pack assembly of a magnetic disc memory system. A plurality of cavities for counterbalance weights are provided in a uniform angular distribution about the center point of the retaining ring. The cavities are inset from the outer boundary in a top surface of the retaining ring so that all spatial points within the cavities are a lesser distance from the center of the ring than any point included in the outer boundary of the top surface. Counterbalance weights are inserted in the appropriate ones of the cavities to offset otherwise present unbalanced moments about the axis of rotation and minimize dynamic instability in the rotating disc pack assembly.
Inventors
- 👤 D Doyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:03
CPC Classifications
G; G11; G11B; G11B33/00; G11B33/02; G11B33/08; G11B17/00; G11B17/02; G11B17/038; G11B19/00; G11B19/20; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/211
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
An improved annular retaining ring in a disc pack assembly of a magnetic disc memory system, said improvement comprising a plurality of cavities in said annular ring, said cavities being positioned in a uniform angular distribution about the center point of said ring, said cavities being further positioned in a top surface of said ring, said cavities being still further positioned in said top surface whereby the distance from the point in each of said cavities farthest from said center point of said ring is less than the distance from the outer boundary point in said top surface nearest to said center point of said ring.
Claim 2
Dependent Claim
106 words
An improved annular retaining ring in a disc pack assembly of a magnetic disc memory system, said improvement comprising a plurality of cavities in said annular ring, said cavities being positioned in a uniform angular distribution about the center point of said ring, said cavities being further positioned in a top surface of said ring, said cavities being still further positioned in said top surface whereby the distance from the point in each of said cavities farthest from said center point of said ring is less than the distance from the outer boundary point in said top surface nearest to said center point of said ring.
Claim 3
Dependent Claim
31 words
The improved annular retaining ring of claim 1, said improvement further comprising a plurality of counterbalance weights, the respective ones of said weights being positioned in predetermined ones of said cavities.
Claim 4
Dependent Claim
20 words
The improved annular retaining ring of claim 1, wherein said retaining ring is cast and said cavities are cast therein.
Claim 5
Dependent Claim
20 words
The improved annular retaining ring of claim 1, wherein said retaining ring is cast and said cavities are milled therein.
Claim 6
Dependent Claim
118 words
In a disc pack assembly having a retainer ring situated at the bottom of the pack, the improvement comprising a plurality of cavities in said annular riNg, said cavities being positioned in a uniform angular distribution about the center point of said ring, said cavities being further positioned in a top surface of said ring, said cavities being still further positioned in said top surface whereby the distance from the point in each of said cavities farthest from said center point of said ring is less than the distance from the outer boundary point in said top surface nearest to said center point of said ring, and a counterbalance weight situated in at least one of said cavities.
Claim 7
Dependent Claim
118 words
In a disc pack assembly having a retainer ring situated at the bottom of the pack, the improvement comprising a plurality of cavities in said annular riNg, said cavities being positioned in a uniform angular distribution about the center point of said ring, said cavities being further positioned in a top surface of said ring, said cavities being still further positioned in said top surface whereby the distance from the point in each of said cavities farthest from said center point of said ring is less than the distance from the outer boundary point in said top surface nearest to said center point of said ring, and a counterbalance weight situated in at least one of said cavities.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |