US3740735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air circulation apparatus
Assignee: Diablo Systems Inc
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Filing: 1970-09-14
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Granted: 1973-06-19
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Expires: 1990-09-14
Abstract
Abstract Air circulation apparatus, especially useful within magnetic disk memory units, recirculates a portion of the filtered air within the housing for the unit and disk drive to provide increased air velocity to dislodge dust particles from the disk unit and at the same time reduce the air flow requirements of the cleaning filter.
Inventors
- 👤 A Gabor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:28
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/021; G11B23/50; G11B23/505
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
207 words
Air circulation apparatus for a self-contained and removable magnetic disk memory unit such unit having air intake and exhaust ports said apparatus comprising: a housing for said memory unit such housing having air intake and exhaust ports from and to ambient atmosphere respectively; and centrifugal fan means coupled to said air intake port of said housing and to said air intake port of said memory unit said fan means including a fan wheel and a scroll case having a gradually increasing outer radius such scroll case having a central opening for said fan wheel and first and second port means, said first port means being at the larger end of said scroll case and being coupled to said air intake port of said memory unit for supplying both cleaning and cooling air across the disk surface such air exiting said unit at said exhaust port of said memory unit, and said second port means being located in an intermediate position between said larger end and the smaller end of said scroll case and having a smaller aperture than said first port means to provide part of a closed loop path for the partial recirculation of air within said housing from said exhaust port of said memory unit.
Claim 2
Dependent Claim
207 words
Air circulation apparatus for a self-contained and removable magnetic disk memory unit such unit having air intake and exhaust ports said apparatus comprising: a housing for said memory unit such housing having air intake and exhaust ports from and to ambient atmosphere respectively; and centrifugal fan means coupled to said air intake port of said housing and to said air intake port of said memory unit said fan means including a fan wheel and a scroll case having a gradually increasing outer radius such scroll case having a central opening for said fan wheel and first and second port means, said first port means being at the larger end of said scroll case and being coupled to said air intake port of said memory unit for supplying both cleaning and cooling air across the disk surface such air exiting said unit at said exhaust port of said memory unit, and said second port means being located in an intermediate position between said larger end and the smaller end of said scroll case and having a smaller aperture than said first port means to provide part of a closed loop path for the partial recirculation of air within said housing from said exhaust port of said memory unit.
Claim 3
Dependent Claim
46 words
Apparatus as In claim 1 where said scroll case includes top and side walls and said first port means includes an aperture in said top wall and said second port means includes an aperture formed by a cutout in said top wall extending into said sidewall.
Claim 4
Dependent Claim
25 words
Apparatus as in claim 1 where said top wall is parallel and spaced in close proximity to the bottom surface of said disk memory unit.
Claim 5
Dependent Claim
17 words
Apparatus as in claim 1 where said air intake port of said housing includes air filtering means.
Claim 6
Dependent Claim
28 words
Apparatus as in claim 1 together with a motor having a drive shaft coupled to said disk unit, said fan wheel also being mounted on said drive shaft.
Claim 7
Dependent Claim
28 words
Apparatus as in claim 1 where said exhaust port of said housing includes baffle means forming a narrow flow duct together with electrical components mounted within said duct.
Claim 8
Dependent Claim
21 words
Apparatus as in claim 6 where said components are mounted on a heat sink which forms a wall of said duct.
References Cited (Backward Citations)
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US3303485A
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US3286445A
Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |