US4257077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure pad and shielding plate for a tape cassette
Assignee: TDK Corp
•
Filing: 1979-03-16
•
Granted: 1981-03-17
•
Expires: 1999-03-16
Abstract
Abstract A tape cassette comprises a supporting arm extending over a magnetic shielding plate, a movable body supported by the supporting arm to be movable forward and backward and a resilient material disposed between the movable body and the supporting arm whereby a head can be inserted along the magnetic shielding plate to improve magnetic shielding effect and magnetic recording and reproducing characteristics.
Inventors
- 👤 Toshihiko Ishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:54
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08757; G11B23/08771; G11B15/00; G11B15/60; G11B15/62
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
141 words
A tape cassette comprising: a casing for said tape; an opening in said casing for a magnetic head, said tape adapted to be moved past said opening for contact by one side of said tape with said head; a magnetic shielding plate fixed in said casing at a location adjacent said opening and on the other side of said tape; a supporting arm fixed to said casing and extending from at least said magnetic shielding plate towards said tape; a movable body supported by said supporting arm for movement towards and away from said tape only; and resilient means disposed between said supporting arm and said movable body, said resilient means adapted to bias said movable body towards said tape; whereby said tape may be moved by said head towards said shielding plate against the biasing force of said resilient means.
Claim 2
Dependent Claim
141 words
A tape cassette comprising: a casing for said tape; an opening in said casing for a magnetic head, said tape adapted to be moved past said opening for contact by one side of said tape with said head; a magnetic shielding plate fixed in said casing at a location adjacent said opening and on the other side of said tape; a supporting arm fixed to said casing and extending from at least said magnetic shielding plate towards said tape; a movable body supported by said supporting arm for movement towards and away from said tape only; and resilient means disposed between said supporting arm and said movable body, said resilient means adapted to bias said movable body towards said tape; whereby said tape may be moved by said head towards said shielding plate against the biasing force of said resilient means.
Claim 3
Dependent Claim
15 words
A tape cassette according to claim 1 wherein said resilient means comprises a coil spring.
Claim 4
Dependent Claim
23 words
A tape cassette according to claim 2 including a buffer contacted to the top surface of a second end of said movable body.
Claim 5
Dependent Claim
18 words
A tape cassette according to claim 1 wherein the said resilient means comprises elastic material made of plastic.
Claim 6
Dependent Claim
46 words
A tape cassette according to claim 1 wherein the relative movement of the supporting arm and the movable body is restricted by cooperation of an annular groove formed on the supporting arm and a pair of restriction pieces on a first end of the movable body.
Claim 7
Dependent Claim
71 words
The tape cassette of claim 1 wherein said movable body is hollow and includes a first opening in a first end adjacent said supporting arm wherein one end of said supporting arm is inserted in said first opening of said movable body, and wherein said resilient means is positioned in said hollow movable body between said one end of said supporting arm and a second end of said hollow movable body.
Claim 8
Dependent Claim
76 words
The tape cassette of claim 6 wherein said resilient means is a length of elastic material, wherein said second end of said hollow movable body includes a second opening, wherein said elastic material is positioned partly through said second opening whereby a portion of said elastic material is in said hollow movable body, and wherein said elastic material includes a slit at said second opening whereby said elastic material is not distorted by said second opening.
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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) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |