US3706426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Container with brake for enclosed reel
Assignee: International Business Machines Corp
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Filing: 1970-11-27
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Granted: 1972-12-19
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Expires: 1990-11-27
Abstract
Abstract A cartridge stores a magnetic recording tape on two reels which are rotated when the cartridge is mounted on a drive spindle. Reels are prevented from turning inside the unmounted cartridge by a brake which is released when the cartridge is mounted. In one embodiment, the brake frictionally bears against the reel, and in another embodiment, fingers on the brake engage reel locking fingers. In both cases, the reel is released when the drive spindle disengages the brake from the reel.
Inventors
- 👤 Marvin E Prahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:19
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
134 words
In a machine-mountable cartridge for storing a flexible web on a reel, having a central aperture for receiving a shaft when the cartridge is mounted for use, means for maintaining reel position when the shaft is not present in the aperture, comprising: a first circular reel braking structure integral with the reel, surrounding the reel aperture and having inwardly extending fingers; a second separate circular braking structure having downwardly extending fingers operable to mate with the fingers of the first structure, for mating with said first structure, movable into, and out of, engagement with said first reel braking structure; and elastic means, contracting the second structure for restraining rotation of the second structure and for urging the first and second structures into engagement only when the shaft is not present in the reel aperture.
Claim 2
Dependent Claim
134 words
In a machine-mountable cartridge for storing a flexible web on a reel, having a central aperture for receiving a shaft when the cartridge is mounted for use, means for maintaining reel position when the shaft is not present in the aperture, comprising: a first circular reel braking structure integral with the reel, surrounding the reel aperture and having inwardly extending fingers; a second separate circular braking structure having downwardly extending fingers operable to mate with the fingers of the first structure, for mating with said first structure, movable into, and out of, engagement with said first reel braking structure; and elastic means, contracting the second structure for restraining rotation of the second structure and for urging the first and second structures into engagement only when the shaft is not present in the reel aperture.
Claim 3
Dependent Claim
149 words
In a cartridge storing flexible magnetic recording tape on two flangeless reels, intended for insertion into a magnetic tape drive having spindles for engaging reel apertures, two brakes, one for each reel, for maintaining tape tension between the reels when the cartridge is not inserted in the drive, each comprising: a toothed disc, positioned in said cartridge above the reel aperture, movable, along a line through the aperture center, upward when the spindle is present in the reel aperture and downward when it is not; a toothed surface, integral with the reel and surrounding the reel aperture, for mating with the toothed disc when it is moved into engagement with it; and a spring, mounted between the inside cartridge surface and the top of the toothed disc to urge the disc downward into mating contact with the reel surface when the spindle is not present in the reel aperture.
Claim 4
Dependent Claim
149 words
In a cartridge storing flexible magnetic recording tape on two flangeless reels, intended for insertion into a magnetic tape drive having spindles for engaging reel apertures, two brakes, one for each reel, for maintaining tape tension between the reels when the cartridge is not inserted in the drive, each comprising: a toothed disc, positioned in said cartridge above the reel aperture, movable, along a line through the aperture center, upward when the spindle is present in the reel aperture and downward when it is not; a toothed surface, integral with the reel and surrounding the reel aperture, for mating with the toothed disc when it is moved into engagement with it; and a spring, mounted between the inside cartridge surface and the top of the toothed disc to urge the disc downward into mating contact with the reel surface when the spindle is not present in the reel aperture.
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |