Patent US1891573A successfully refreshed from Google Patents.
Patent US3696775A successfully refreshed from Google Patents.
US3696775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic tape recorder particularly of the tape cassette type
Assignee: SUD ATLAS WERKE GmbH
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Filing: 1970-10-26
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Granted: 1972-10-10
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Expires: 1990-10-26
Abstract
Abstract A magnetic tape recorder, particularly of the tape cassette type, has support spindles for the tape carrier reels, and these support spindles are provided with driving pulleys which are coupled to a rotary driving element, during forward and reverse movement of the tape, by intermediate driving gear connected with the driving pulleys. A torque responsive clutch is included in at least the intermediate driving gear connected to the support spindle operable to effect forward movement of the tape. The torque responsive clutch includes a driven member fixed to the support spindle and a driving member freely rotatable on the driven member. The driving and driven members are interconnected by a spring wire having one end conformingly fitted in a slot in one member and the other end extending into an annular recess in the other member and bent to engage detent recesses in the other member. When the two members slip over each other, they form an acoustic signal device warning that the tape has been completely unwound from one or the other of the two tape carrier reels.
Inventors
- 👤 Ernst Markart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:12
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/46; G11B15/50; G11B15/02; G11B15/16; G11B15/26; G11B15/32; F; F16; F16D; F16D2300/00; F16D2300/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
101 words
In a magnetic tape recorder, particularly of the tape cassette type, with tape carrier reels attached on support spindles having driving pulleys, which are coupled to a rotary driving element during forward and reverse movement of the tape, by intermediate driving gear connected with the driving pulleys: the improvement comprising a torque responsive clutch included in at least the intermediate driving gear connected to the support spindle operable to effect forward movement of the tape; said torque responsive clutch being designed as an acoustic signal generator which generates an acoustic signal responsive to the tape being completely unwound from one reel.
Claim 2
Dependent Claim
101 words
In a magnetic tape recorder, particularly of the tape cassette type, with tape carrier reels attached on support spindles having driving pulleys, which are coupled to a rotary driving element during forward and reverse movement of the tape, by intermediate driving gear connected with the driving pulleys: the improvement comprising a torque responsive clutch included in at least the intermediate driving gear connected to the support spindle operable to effect forward movement of the tape; said torque responsive clutch being designed as an acoustic signal generator which generates an acoustic signal responsive to the tape being completely unwound from one reel.
Claim 3
Dependent Claim
60 words
In a magnetic tape recorder, as claimed in claim 1, said torque responsive clutch comprising two clutch disks mounted on the support spindle, and including a first clutch disk fixedly connected with the support spindle and a second clutch disk freely rotatable on the support spindle; and resilient elastic means firmly, but releasably, interconnecting said clutch disks for conjoint rotation.
Claim 4
Dependent Claim
32 words
In a magnetic tape recorder, as claimed in claim 2, said resilient elastic means comprising a releasable locking pawl mounted on said first clutch disk and engageable with said second clutch disk.
Claim 5
Dependent Claim
44 words
In a magnetic tape recorder, as claimed in claim 3, said releasable locking pawl comprising a preformed spring wire part having one end fixed to said first clutch disk and having a free end releasably engageable with cooperating formations on said second clutch disk.
Claim 6
Dependent Claim
108 words
In a magnetic tape recorder, as claimed in claim 4, said spring wire part having a prestressed free end formed as a releasable abutment engageable with circumferentially spaced recesses in a cylindrical surface of said second clutch disk, said recesses being separated by interposed ring sections of said second clutch disk; said prestressed free end, when the torque on said clutch exceeds a predetermined value, being disengaged from a recess, in which it is then engaged, by the adjacent interposed ring section and engaged in following recesses in succession; said engagement and disengagement providing an acoustic signal indicating that the tape has been completely unwound from one reel.
Claim 7
Dependent Claim
39 words
In a magnetic tape recorder, as claimed in claim 2, said second such disk being mounted concentrically and rotatably on said first clutch disk; and means retaining said second clutch disk against axial displacement relative to the support spindle.
Claim 8
Dependent Claim
34 words
In a magnetic tape recorder, as claimed in claim 6, a coating of bearing material on that surface of at least one clutch disk engageable with a cooperating surface on the other clutch disk.
Claim 9
Dependent Claim
25 words
In a magnetic tape recorder, as claimed in claim 7, respective coatings of bearing material being provided on both interengageable surfaces of the clutch disks.
Claim 10
Dependent Claim
35 words
In a magnetic tape recorder, as claimed in claim 1, respective torque responsive clutches included in the intermediate driving gear connected to both support spindles, and serving, independently of each other, as acoustic signal generators.
References Cited (Backward Citations)
US1167285A
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US2712448A
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US3150377A
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US2948258A
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US3167267A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |