US4589105A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible disc cassette
Assignee: Sony Corp
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Filing: 1984-05-07
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Granted: 1986-05-13
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Expires: 2004-05-07
Abstract
Abstract A flexible disc cassette is provided with a shutter which is capable of opening/closing a head access hole and a pad insertion hole respectively formed in upper and lower halves thereof. A V-shaped torsion spring is used as the spring for biasing the shutter in the closed position. The lengths of the linear arm portions integrally formed with both sides of the coiled portion of the spring are approximately the same. Both tips of the arm portions are bent at approximately 90° so as to form the L-shaped hooks which has the same length and which extend in the opposite directions along the height of the coiled portion. The L-shaped hooks are stopped by the shutter and the cassette case.
Inventors
- 👤 Tsuneo Nemoto
- 👤 Osamu Koizumi
- 👤 Koukichi Sugawara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:32
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/03; G11B23/033; G11B23/0332
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
190 words
A magnetic disc cassette comprising, a flexible magnetic disc, a casing comprising an upper shell and a lower shell for containing the flexible magnetic disc therebetween, a head access hole provided in said casing for exposing a portion of the flexible magnetic disc to permit recording and/or reproducing operation, a shutter reciprocably mounted on one edge of said casing and selectively positionable in a closed position and an open position, said shutter including a shutter hole and said access hole being accessible through said shutter hole in said open position, a V-shaped shutter spring urging said shutter toward said closed position, said V-shaped shutter spring having legs lying generally in a plane parallel to the path of movement of the shutter and each leg having an L-shaped hook formed generally perpendicular to said plane at its respective tip, hook means provided in said shutter for engaging one of said L-shaped hooks, and a recess provided in one of said shells of said casing for confining the other of said L-shaped hooks, said recess having a guiding portion which permits the other of said L-shaped hooks to pass to said recess.
Claim 2
Dependent Claim
190 words
A magnetic disc cassette comprising, a flexible magnetic disc, a casing comprising an upper shell and a lower shell for containing the flexible magnetic disc therebetween, a head access hole provided in said casing for exposing a portion of the flexible magnetic disc to permit recording and/or reproducing operation, a shutter reciprocably mounted on one edge of said casing and selectively positionable in a closed position and an open position, said shutter including a shutter hole and said access hole being accessible through said shutter hole in said open position, a V-shaped shutter spring urging said shutter toward said closed position, said V-shaped shutter spring having legs lying generally in a plane parallel to the path of movement of the shutter and each leg having an L-shaped hook formed generally perpendicular to said plane at its respective tip, hook means provided in said shutter for engaging one of said L-shaped hooks, and a recess provided in one of said shells of said casing for confining the other of said L-shaped hooks, said recess having a guiding portion which permits the other of said L-shaped hooks to pass to said recess.
Claim 3
Dependent Claim
20 words
A flexible magnetic cassette according to claim 1 wherein said L-shaped hooks respectively extend in opposite directions from each other.
Claim 4
Dependent Claim
49 words
A flexible magnetic cassette according to claim 1 wherein said guiding portion has a lower step portion and a side face portion, the other of said L-shaped hooks being slidably guided by said lower step portion and said side face portion during assembly of said shutter on said casing.
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) | 1989-05-12 | 1989-11-11 | 1990-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-12 | 1993-11-11 | 1994-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-12 | 1997-11-11 | 1998-05-13 | $7700.00 | Window Closed / Lapsed |