Patent US3257803A successfully refreshed from Google Patents.
Patent US4943880A successfully refreshed from Google Patents.
US4943880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disk locking mechanism for disk cartridge
Assignee: 3M Co
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Filing: 1988-11-14
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Granted: 1990-07-24
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Expires: 2008-11-14
Abstract
Abstract A disk cartridge for a rotatable recording disk includes a slidable shutter for providing access to the recording disk through the disk cartridge. A unique mounting for a return spring for the shutter allows the return spring to be of a maximum length which allows increased control of the forces generated by the return spring. The disk cartridge is further provided with a locking mechanism for preventing movement of the recording disk within the disk cartridge during storage.
Inventors
- 👤 Robert A. Muehlhausen
- 👤 John F. Fairchild
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:33
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/03; G11B23/0301; G11B23/0306; G11B23/0308
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
122 words
A locking mechanism for a disc cartridge including a housing enclosing a recording disc for rotation within said housing and shutter means movable between a closed position preventing access to the disc through said housing and an open position providing access to the disc through the housing, said locking mechanism comprising: a locking lever pivotally mounted to said housing and having a first end for contact with said disc and a second end disposed opposite the pivotal mounting of said locking lever for contact with said shutter means when said shutter means is in said closed position so that said first end of said locking lever is forced into contact with said disc when said shutter means is in said closed position.
Claim 2
Dependent Claim
122 words
A locking mechanism for a disc cartridge including a housing enclosing a recording disc for rotation within said housing and shutter means movable between a closed position preventing access to the disc through said housing and an open position providing access to the disc through the housing, said locking mechanism comprising: a locking lever pivotally mounted to said housing and having a first end for contact with said disc and a second end disposed opposite the pivotal mounting of said locking lever for contact with said shutter means when said shutter means is in said closed position so that said first end of said locking lever is forced into contact with said disc when said shutter means is in said closed position.
Claim 3
Dependent Claim
153 words
A locking mechanism for a disc cartridge including a housing enclosing a recording disc for rotation within said housing and shutter means movable between a closed position preventing access to the disc through said housing and an open position providing access to the disc through the housing, said locking mechanism comprising: a locking lever pivotally mounted to said housing and having a first end for contact with said disc and a second end disposed opposite the pivotal mounting of said locking lever for contact with said shutter means when said shutter means is in said closed position so that said first end of said locking lever is forced into contact with said disc when said shutter means is in said closed position; and biasing means connected between said locking lever and said housing for biasing said locking lever out of contact with said disc when said shutter means is in said open position.
Claim 4
Dependent Claim
153 words
A locking mechanism for a disc cartridge including a housing enclosing a recording disc for rotation within said housing and shutter means movable between a closed position preventing access to the disc through said housing and an open position providing access to the disc through the housing, said locking mechanism comprising: a locking lever pivotally mounted to said housing and having a first end for contact with said disc and a second end disposed opposite the pivotal mounting of said locking lever for contact with said shutter means when said shutter means is in said closed position so that said first end of said locking lever is forced into contact with said disc when said shutter means is in said closed position; and biasing means connected between said locking lever and said housing for biasing said locking lever out of contact with said disc when said shutter means is in said open position.
Claim 5
Dependent Claim
167 words
A locking mechanism for a disc cartridge including a housing enclosing a recording disc for rotation within said housing and shutter means movable between a closed position preventing access to the disc through said housing and an open position providing access to the disc through the housing, said locking mechanism comprising: a locking lever pivotally mounted to said housing and having a first end for contact with said disc and a second end disposed opposite the pivotal mounting of said locking lever for contact with said shutter means when said shutter means is in said closed position so that said first end of said locking lever is forced into contact with said disc when said shutter means is in said closed position; and a resilient arm extending from said second end of said locking lever for contact with said shutter means when said shutter means is in said closed position so that said first end of said locking lever is resiliently urged into contact with said disc.
Claim 6
Dependent Claim
167 words
A locking mechanism for a disc cartridge including a housing enclosing a recording disc for rotation within said housing and shutter means movable between a closed position preventing access to the disc through said housing and an open position providing access to the disc through the housing, said locking mechanism comprising: a locking lever pivotally mounted to said housing and having a first end for contact with said disc and a second end disposed opposite the pivotal mounting of said locking lever for contact with said shutter means when said shutter means is in said closed position so that said first end of said locking lever is forced into contact with said disc when said shutter means is in said closed position; and a resilient arm extending from said second end of said locking lever for contact with said shutter means when said shutter means is in said closed position so that said first end of said locking lever is resiliently urged into contact with said disc.
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) | 1993-07-23 | 1994-01-22 | 1994-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-23 | 1998-01-22 | 1998-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-23 | 2002-01-22 | 2002-07-24 | $7700.00 | Window Closed / Lapsed |