US4586102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Track number indicator
Assignee: Eastman Kodak Co
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Filing: 1983-08-04
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Granted: 1986-04-29
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Expires: 2003-08-04
Abstract
Abstract In a magnetic disk cartridge, a dial member is rotatable relative to the cartridge housing to a plurality of positions for indicating the number of tracks recorded on a disk surface. A resilient locking finger is connected to the dial member for engaging respective engagable means on the housing, which correspond to the various track number positions. Whenever the cartridge is removed from a recording and/or playback apparatus, the locking finger engages one of the engagable means to prevent the dial member from rotating out of the last position to which it was rotated. An access opening is provided in the housing to receive a rotational driver of the apparatus for rotating the dial member to its track number positions. The locking finger is supported for movement by the rotational driver to separate from any one of the engagable means as the driver is received through the access opening, thereby freeing the dial member for rotation by the driver.
Inventors
- 👤 Richard J. Bresson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:19
CPC Classifications
G; G11; G11B; G11B33/00; G11B33/10; G11B23/00; G11B23/02; G11B23/03; G11B23/033; G11B23/0332
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
207 words
In a magnetic disk cartridge of the type wherein (a) a housing contains a magnetic disk, (b) a head-access opening is provided in said housing to receive a magnetic head for recording and/or reading information in substantially circular tracks on said disk, (c) a dial member is rotatable relative to said housing to a plurality of positions for indicating the number of tracks recorded on said disk, and (d) a driver-access opening is provided in said housing to receive a rotational driver for rotating said dial member to its track number positions, the improvement comprising: respective engagable means corresponding to the track number positions of said dial member, said engagable means being arranged within said housing concentrically about said driver-access opening; resilient locking means connected to said dial member and biased for engaging said respective engagable means to positively prevent said dial member from rotating out of a corresponding track number position; and means supporting said locking means across said driver-access opening for displacement by the rotational driver to separate said locking means from said respective engagable means as the rotational driver is received through said driver-access opening, whereby the driver will maintain said locking means separated from said engagable means during rotation of said dial member.
Claim 2
Dependent Claim
207 words
In a magnetic disk cartridge of the type wherein (a) a housing contains a magnetic disk, (b) a head-access opening is provided in said housing to receive a magnetic head for recording and/or reading information in substantially circular tracks on said disk, (c) a dial member is rotatable relative to said housing to a plurality of positions for indicating the number of tracks recorded on said disk, and (d) a driver-access opening is provided in said housing to receive a rotational driver for rotating said dial member to its track number positions, the improvement comprising: respective engagable means corresponding to the track number positions of said dial member, said engagable means being arranged within said housing concentrically about said driver-access opening; resilient locking means connected to said dial member and biased for engaging said respective engagable means to positively prevent said dial member from rotating out of a corresponding track number position; and means supporting said locking means across said driver-access opening for displacement by the rotational driver to separate said locking means from said respective engagable means as the rotational driver is received through said driver-access opening, whereby the driver will maintain said locking means separated from said engagable means during rotation of said dial member.
Claim 3
Dependent Claim
90 words
The improvement as recited in claim 1, wherein said dial member has a central opening which opens into said driver-access opening to receive the rotational driver and has a window between said central opening and said respective engagable means, and said locking means includes an elongate resilient member having one end portion connected to said dial member within said central opening for rotation of said resilient member with said dial member and another end portion extending extending out of said window for engagement with any one of said engagable means.
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) | 1989-04-28 | 1989-10-28 | 1990-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-28 | 1993-10-28 | 1994-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-28 | 1997-10-28 | 1998-04-29 | $7700.00 | Window Closed / Lapsed |