US4796138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shutter in a write protect magnetic disk cartridge
Assignee: Fujifilm Holdings Corp
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Filing: 1987-04-03
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Granted: 1989-01-03
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Expires: 2007-04-03
Abstract
Abstract A write-protect shutter in a magnetic disk cartridge in which the two case walls are joined by a boss around which legs of the shutter slide. The fusing joining the boss to the case wall may cause a protrusion at the joint. The legs are formed with indentations to avoid the protrusion.
Inventors
- 👤 Tuyoshi Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:20
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/28; G11B23/288; G11B23/02; G11B23/03; G11B23/0301; G11B23/0302; G11B23/0303
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
172 words
A disk cartridge, comprising: a recording disk; a case rotatably accommodating said disk and having aligned through holes in an upper and a lower principal wall, said case comprising a boss bonded to at least one of said upper and lower walls, wherein a bonding protrusion may be formed between said boss and said one wall at the junction thereof; and a slidable member sliding between said walls to selectively cover said through holes, said slidable member including legs slidable on opposite sides of said boss, said legs being separated by a distance slightly larger than the diameter of said boss but less than the combined diameter of said boss and said bonding protrusion, said legs being shaped so that a portion thereof which slides adjacent the junction of said boss and said one wall is indented to provide a separation from one indentation to another slightly greater than the combined diameter of said boss and said bonding protrusion, wherein said member can slide without coming into contact with said bonding protrusion.
Claim 2
Dependent Claim
172 words
A disk cartridge, comprising: a recording disk; a case rotatably accommodating said disk and having aligned through holes in an upper and a lower principal wall, said case comprising a boss bonded to at least one of said upper and lower walls, wherein a bonding protrusion may be formed between said boss and said one wall at the junction thereof; and a slidable member sliding between said walls to selectively cover said through holes, said slidable member including legs slidable on opposite sides of said boss, said legs being separated by a distance slightly larger than the diameter of said boss but less than the combined diameter of said boss and said bonding protrusion, said legs being shaped so that a portion thereof which slides adjacent the junction of said boss and said one wall is indented to provide a separation from one indentation to another slightly greater than the combined diameter of said boss and said bonding protrusion, wherein said member can slide without coming into contact with said bonding protrusion.
Claim 3
Dependent Claim
18 words
A disk cartridge as recited in claim 1, wherein said slidable member is a mistaken erasure prevention member.
Claim 4
Dependent Claim
18 words
A disk cartridge as recited in claim 2, wherein said legs contains position-fixing projections at free ends thereof.
Claim 5
Dependent Claim
28 words
A disk cartridge as recited in claim 1, wherein said boss is formed integrally with one of said walls and is fused with the other of said walls.
Claim 6
Dependent Claim
38 words
A disk cartridge as recited in claim 4, wherein each of said legs comprises a substantially flat surface facing said boss and wherein said indentation is formed in a side of said flat surface facing said other wall.
Claim 7
Dependent Claim
26 words
A disk cartridge as recited in claim 5, wherein said indentation comprises a triangular oblique surface with a side at a free end of said leg.
Claim 8
Dependent Claim
20 words
A disk cartridge as recited in claim 5, wherein said indentation comprises a uniform oblique surface extending along said leg.
Claim 9
Dependent Claim
20 words
A disk cartridge as recited in claim 5, wherein said indentation comprises a notch in a corner of said leg.
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) | 1992-01-03 | 1992-07-04 | 1993-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-03 | 1996-07-04 | 1997-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-03 | 2000-07-04 | 2001-01-03 | $7700.00 | Window Closed / Lapsed |