Patent US4383266A successfully refreshed from Google Patents.
US4090224A
Expired / Lapsed
US
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Apparatus for preventing inadvertent erasure of cassette tape
Assignee: Olympus Corp
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Filing: 1976-08-20
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Granted: 1978-05-16
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Expires: 1996-08-20
Abstract
Abstract Apparatus for preventing an inadvertent erasure of a cassette tape in a cassette tape recorder or transcriber which has the function of erasing the full tape width or all the tracks during a rapid advance or a rewind operation. The apparatus disables the full width erasure upon detection of any one of those lugs which are provided on the part of a cassette for purpose of preventing an inadvertent erasure.
Inventors
- 👤 Masaaki Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:52
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/05; G11B15/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
130 words
In combination, a cassette tape recorder and a cassette therefor; the tape in said cassette having plural tracks; said cassette having at least one erasure prevention lug extending therefrom; said tape recorder having a record/playback head and tape drive means selectively providing rapid advance and rewind of the tape; said tape recorder also having erasing means including a full tape width erasing head operable during said rapid advance and said rewind; and detection means extending at least partially in the region of said lug for detecting the presence and absence of said lug; said detection means being operably connected to said erasing means to disable full width erasure when the said lug is not present; said lug being removable to prevent full width erasure of a record on the tape.
Claim 2
Dependent Claim
130 words
In combination, a cassette tape recorder and a cassette therefor; the tape in said cassette having plural tracks; said cassette having at least one erasure prevention lug extending therefrom; said tape recorder having a record/playback head and tape drive means selectively providing rapid advance and rewind of the tape; said tape recorder also having erasing means including a full tape width erasing head operable during said rapid advance and said rewind; and detection means extending at least partially in the region of said lug for detecting the presence and absence of said lug; said detection means being operably connected to said erasing means to disable full width erasure when the said lug is not present; said lug being removable to prevent full width erasure of a record on the tape.
Claim 3
Dependent Claim
35 words
An apparatus according to claim 1 in which said cassette includes a pair of lugs and said detection means includes a pair of normally open microswitches connected in series with the full width erase head.
Claim 4
Dependent Claim
92 words
An apparatus according to claim 1 in which said cassette includes a pair of lugs and said detection means includes an erase lever, and a pair of detecting levers for detecting the presence and absence of an associated one of a pair of said lugs on said cassette, the erase lever including a detent means, the detecting levers being each formed with a tab which is brought into engagement with the corresponding detent means on the erase lever when the absence of a lug is detected, thereby inhibiting a full width erasure.
Claim 5
Dependent Claim
81 words
An apparatus according to claim 1 in which two window slots are formed in the cassette and the cassette is also provided with a central window slot for receiving the record/playback head and a pair of end window slots for receiving selectively a pinch roller and an erase head; said two window slots being respectively located between said central window slot and said end window slots; said full width erasing head being selectively received in one of said cassette window slots.
Claim 6
Dependent Claim
47 words
An apparatus according to claim 1 which said tape cassette has a pair of tape pressure pads, one of the tape pads bearing against said record/playback head through the magnetic tape, the other tape pad bearing against the full tape width erase head through the magnetic tape.
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) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |