Patent US5312887A successfully refreshed from Google Patents.
Patent US3682486A successfully refreshed from Google Patents.
US3682486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure pad
Assignee: Ampex Corp
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Filing: 1969-12-11
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Granted: 1972-08-08
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Expires: 1989-12-11
Abstract
Abstract A pressure pad for magnetic tapes and particularly for use within magnetic tape cartridges is provided with tape engaging synthetic fibers individually attached at inner ends to a base and with outer free ends for engaging the tape. The fibers are substantially parallel to each other and normal to the plane of the tape and are sufficiently flexible to be bent by the tape and to provide a soft, smooth surface defined by a multiplicity of points of contact. The fibers provide an acceptable low sliding frictional contact with the tape.
Inventors
- 👤 Brian L Zwetzig
- 👤 Don R Coy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:09
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G11B15/62
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
195 words
A tape pressing means for urging a magnetic tape against a transducer head comprising a spring member, and a pressure pad carried by said spring member, a dense non-woven fibrous tape engaging surface on said pad defined by substantially parallel, individual synthetic fibers of rayon of about 5 1/2 denier, the outer free ends of said fibers engaging the tape at a multiplicity of yielding individual contact points, said fibers being substantially perpendicular to the plane of said tape, a compressible substrate secured to said spring member, inner ends of said fibers individually bonded to said substrate and projecting normal thereto and being flexible to bend in the direction of tape movement in either a forward or reverse direction movement of said tape, said compressible foam substrate being compressible to distribute forces from said spring member to said individual fibers, said fibers having a length in the range of about 1 to 3 millimeters and being individually flexible abOut their bonded inner ends to accommodate irregularities in the tape engaged thereby, said foam substrate having a substantially uniform cross-sectional thickness greater than three millimeters and having a flat surface to which are bonded said fibers.
Claim 2
Dependent Claim
195 words
A tape pressing means for urging a magnetic tape against a transducer head comprising a spring member, and a pressure pad carried by said spring member, a dense non-woven fibrous tape engaging surface on said pad defined by substantially parallel, individual synthetic fibers of rayon of about 5 1/2 denier, the outer free ends of said fibers engaging the tape at a multiplicity of yielding individual contact points, said fibers being substantially perpendicular to the plane of said tape, a compressible substrate secured to said spring member, inner ends of said fibers individually bonded to said substrate and projecting normal thereto and being flexible to bend in the direction of tape movement in either a forward or reverse direction movement of said tape, said compressible foam substrate being compressible to distribute forces from said spring member to said individual fibers, said fibers having a length in the range of about 1 to 3 millimeters and being individually flexible abOut their bonded inner ends to accommodate irregularities in the tape engaged thereby, said foam substrate having a substantially uniform cross-sectional thickness greater than three millimeters and having a flat surface to which are bonded said fibers.
Claim 3
Dependent Claim
29 words
A tape pressing means in which said foam substrate has a density of about 2 pounds per cubic foot and a pore size of about 80 to 90 PPI.
Claim 4
Dependent Claim
29 words
A tape pressing means in which said foam substrate has a density of about 2 pounds per cubic foot and a pore size of about 80 to 90 PPI.
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |