Patent US5318240A successfully refreshed from Google Patents.
US5318240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reel driving clutch of magnetic recording/playback system
Assignee: LG Electronics Inc
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Filing: 1992-08-21
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Granted: 1994-06-07
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Expires: 2012-08-21
Abstract
Abstract A reel driving clutch for transmitting power to a reel of a magnetic recording/playback system such as a VCR and a DAT. The clutch comprises a shaft fixed to a base plate of the system, a disk rotatably mounted on the shaft to which power from an idler is transmitted, a reel body rotatably mounted on the shaft and placed on the disk, and viscous fluid contained between the disk and the reel body, thereby causing torque of the disk to be transmitted to the reel body via the viscous fluid. The clutch causes a take up reel to be lightened and miniaturized and improves tape running stability.
Inventors
- 👤 Weon K. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:47
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/26; G11B15/46; G11B15/50; G11B15/32
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
127 words
A reel driving clutch for transmitting power to a reel of magnetic recording/playback system comprising: a shaft fixed to a base plate of the system; a disk rotatably mounted on the shaft to which power from an idling means is transmitted, the disk having an annular shoulder with a given height at a lower side of a boss thereof; a reel body rotatably mounted on the shaft and placed on the disk, the reel body being supported on the annular shoulder of the disk, a gap corresponding to the height between the disk and the reel body being provided; and viscous fluid contained between the disk and the reel body, thereby causing torque of the disk to be transmitted to the reel body via the viscous fluid.
Claim 2
Dependent Claim
127 words
A reel driving clutch for transmitting power to a reel of magnetic recording/playback system comprising: a shaft fixed to a base plate of the system; a disk rotatably mounted on the shaft to which power from an idling means is transmitted, the disk having an annular shoulder with a given height at a lower side of a boss thereof; a reel body rotatably mounted on the shaft and placed on the disk, the reel body being supported on the annular shoulder of the disk, a gap corresponding to the height between the disk and the reel body being provided; and viscous fluid contained between the disk and the reel body, thereby causing torque of the disk to be transmitted to the reel body via the viscous fluid.
Claim 3
Dependent Claim
15 words
The reel driving clutch according to claim 1, in which said viscous fluid is grease.
Claim 4
Dependent Claim
51 words
The reel driving clutch according to claim 1, in which said disk has a sealing portion at an upper surface thereof and said reel body has a sealing portion adjacent to the sealing portion of the disk, thereby preventing the viscous fluid between the disk and the reel body from leaking.
Claim 5
Dependent Claim
29 words
The reel driving clutch according to claim 1, in which said disk is provided with a gear for transmitting power and brake teeth at a circumferential outer surface thereof.
Claim 6
Dependent Claim
134 words
A reel driving clutch for transmitting power to a reel of magnetic recording/playback system comprising: a shaft fixed to a base plate of the system; a disk rotatably mounted on the shaft to which power from an idling means is transmitted, the disk having a sealing portion at an upper surface thereof; a reel body rotatably mounted on the shaft and placed on the disk, the reel body having a sealing portion adjacent to the sealing portion of the disk; and viscous fluid contained between the disk and the reel body, thereby causing torque of the disk to be transmitted to the reel body via the viscous fluid, the disk sealing portion and the sealing portion of the reel body preventing the viscous fluid from leaking from between the disk and the reel body.
Claim 7
Dependent Claim
134 words
A reel driving clutch for transmitting power to a reel of magnetic recording/playback system comprising: a shaft fixed to a base plate of the system; a disk rotatably mounted on the shaft to which power from an idling means is transmitted, the disk having a sealing portion at an upper surface thereof; a reel body rotatably mounted on the shaft and placed on the disk, the reel body having a sealing portion adjacent to the sealing portion of the disk; and viscous fluid contained between the disk and the reel body, thereby causing torque of the disk to be transmitted to the reel body via the viscous fluid, the disk sealing portion and the sealing portion of the reel body preventing the viscous fluid from leaking from between the disk and the reel body.
Claim 8
Dependent Claim
15 words
The reel driving clutch according to claim 5, in which said viscous fluid is grease.
Claim 9
Dependent Claim
101 words
A reel driving clutch for transmitting power to a reel of magnetic recording/playback system comprising: a shaft fixed to a base plate of the system; a disk rotatably mounted on the shaft to which power from an idling means is transmitted, the disk being provided with a gear for transmitting power and brake teeth at a circumferential outer surface thereof; a reel body rotatably mounted on the shaft and placed on the disk; and viscous fluid contained between the disk and the reel body, thereby causing torque of the disk to be transmitted to the reel body via the viscous fluid.
Claim 10
Dependent Claim
101 words
A reel driving clutch for transmitting power to a reel of magnetic recording/playback system comprising: a shaft fixed to a base plate of the system; a disk rotatably mounted on the shaft to which power from an idling means is transmitted, the disk being provided with a gear for transmitting power and brake teeth at a circumferential outer surface thereof; a reel body rotatably mounted on the shaft and placed on the disk; and viscous fluid contained between the disk and the reel body, thereby causing torque of the disk to be transmitted to the reel body via the viscous fluid.
Claim 11
Dependent Claim
15 words
The reel driving clutch according to claim 7, in which said viscous fluid is grease.
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) | 1997-06-06 | 1997-12-06 | 1998-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-06 | 2001-12-06 | 2002-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-06 | 2005-12-06 | 2006-06-07 | $7700.00 | Window Closed / Lapsed |