US4589609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic tape cassette
Assignee: Fujifilm Holdings Corp
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Filing: 1985-01-07
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Granted: 1986-05-20
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Expires: 2005-01-07
Abstract
Abstract A magnetic tape cassette including a cassette body having an opening formed in the front end wall thereof and a guard panel having right and left end pieces. The guard panel, which is swingable to open and close the opening, has an engaging groove formed in one of the end pieces, while the cassette body has a slide groove formed in one of the right and left side walls thereof. A lock member is slidably fitted in the slide groove and urged towards the guard panel by a leaf spring, thereby to lock the guard panel. The cassette is so formed that both slides are similar in configuration.
Inventors
- 👤 Kengo Oishi
- 👤 Osamu Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:16
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08735
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
262 words
A magnetic tape cassette comprising a cassette case incorporating a pair of hubs on which a magnetic tape is wound and having a magnetic head inserting opening formed in the front end wall thereof, and a guard panel substantially U-shaped in section having right and left end pieces, said guard panel being swingable vertically of said cassette case to close and open said opening of said cassette case, the improvement wherein: said guard panel has a recess formed in at least one of said right and left end pieces opening towards said cassette case, said cassette case has a pair of steps which are formed on right and left side walls thereof by setting back front end portions of said right and left side walls inwardly of said cassette case, and a slide groove formed in at least one of said right and left side walls in such a manner that said slide groove merges with said step formed on said one side wall and including upper and lower recesses formed respectively inside upper and lower halves of said one side wall in such a manner that said recesses extend towards the back of said cassette case, said cassette case being provided with a lock member having a locking protrusion protruding towards said guard panel and fitted in said recess formed in said end piece of said guard panel, said lock member being slidably inserted in said slide groove, and urging means for urging said lock member towards said guard panel, and the two sides of said cassette are symmetrical in configuration.
Claim 2
Dependent Claim
262 words
A magnetic tape cassette comprising a cassette case incorporating a pair of hubs on which a magnetic tape is wound and having a magnetic head inserting opening formed in the front end wall thereof, and a guard panel substantially U-shaped in section having right and left end pieces, said guard panel being swingable vertically of said cassette case to close and open said opening of said cassette case, the improvement wherein: said guard panel has a recess formed in at least one of said right and left end pieces opening towards said cassette case, said cassette case has a pair of steps which are formed on right and left side walls thereof by setting back front end portions of said right and left side walls inwardly of said cassette case, and a slide groove formed in at least one of said right and left side walls in such a manner that said slide groove merges with said step formed on said one side wall and including upper and lower recesses formed respectively inside upper and lower halves of said one side wall in such a manner that said recesses extend towards the back of said cassette case, said cassette case being provided with a lock member having a locking protrusion protruding towards said guard panel and fitted in said recess formed in said end piece of said guard panel, said lock member being slidably inserted in said slide groove, and urging means for urging said lock member towards said guard panel, and the two sides of said cassette are symmetrical in configuration.
Claim 3
Dependent Claim
56 words
The magnetic tape cassette of claim 1, wherein said lock member comprises a main body part partially extending beyond said slide groove; said locking protrusion, which extends from said main body part towards said guard panel; and sliding parts extending laterally of said main body part and being slidably received in respective ones of said recesses.
Claim 4
Dependent Claim
28 words
The magnetic tape cassette of claim 2, wherein said urging means comprises a leaf spring positioned behind said main body part and having portions received in said recesses.
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) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |