Patent US3614338A successfully refreshed from Google Patents.
US3614338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air bearing head drum with grooves to generate the air layer
Assignee: Individual
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Filing: 1969-02-28
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Granted: 1971-10-19
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Expires: 1989-02-28
Abstract
Abstract A tape recording and/or playback apparatus having a pair of drums acting as a guide member, arranged concentrically, one above the other, for helically guiding the tape therearound. One of the drums is rotatably mounted and is provided with circumferential grooves, which intersect the circumferential velocity vector of said drum. The grooves create an air layer between the tape and drum guide member. The rotating drum with grooves thereon, thus reduces the functional forces on the tape.
Inventors
- 👤 Peter Willibrord Bogels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:48
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/52; G11B5/53; G11B15/00; G11B15/60; G11B15/61
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
171 words
An apparatus for recording and/or playing back magnetic registrations on or from a tape-shaped carrier coated with magnetizable material comprising a base member, a first drumshaped guide member stationarily mounted on said base, a second drum-shaped guide member rotatably mounted above and concentric with said first drum member, said first and second drum guide members having substantially equal outer diameters and forming a gap between them, at least one magnetic recording and/or playback head mounted on said second drum-shaped guide member and located within said gap, means for helically guiding said tape carrier about the circumference of said first and second drum-shaped guide members, and a plurality of grooves located on the circumferential surface of said second drum-shaped guide member, each of said grooves extending in a direction which is at an angle of approximately 30* to a plane which is perpendicular to the axis of rotation of said rotating drum, whereby as said second drum rotates a layer of air is created between said drum surface and said tape carrier.
Claim 2
Independent Claim
171 words
An apparatus for recording and/or playing back magnetic registrations on or from a tape-shaped carrier coated with magnetizable material comprising a base member, a first drumshaped guide member stationarily mounted on said base, a second drum-shaped guide member rotatably mounted above and concentric with said first drum member, said first and second drum guide members having substantially equal outer diameters and forming a gap between them, at least one magnetic recording and/or playback head mounted on said second drum-shaped guide member and located within said gap, means for helically guiding said tape carrier about the circumference of said first and second drum-shaped guide members, and a plurality of grooves located on the circumferential surface of said second drum-shaped guide member, each of said grooves extending in a direction which is at an angle of approximately 30* to a plane which is perpendicular to the axis of rotation of said rotating drum, whereby as said second drum rotates a layer of air is created between said drum surface and said tape carrier.
Claim 3
Dependent Claim
29 words
The apparatus according to claim 1 wherein the direction of rotation of said second drum-shaped guide member is the same as the direction of travel of said tape carrier.
Claim 4
Dependent Claim
48 words
The apparatus according to claim 2 wherein said grooves have a substantially rectangular cross-sectional shape and extend from the upper surface of said second drum-shaped guide member linearly to a termination point on the circumferential surface of said second drum which is spaced from the lower surface thereof.
Claim 5
Dependent Claim
28 words
The apparatus according to claim 3 wherein the speed of rotation of said second drum-shaped guide member is greater than the speed of travel of said tape carrier.
Claim 6
Dependent Claim
60 words
The apparatus according to claim 4 wherein said means for guiding said tape carrier helically about said drum guide members comprises a run-in means for introducing said tape carrier on to said drum-shaped guide members on said first drum-shaped guide member and runoff means for establishing a point of egress of said tape carrier from said second drum-shaped guide member.
Claim 7
Dependent Claim
84 words
The apparatus according to claim 5 wherein the termination points of said grooves form a curved surface which has a curved line of intersection with the outer surface of the drum-shaped guide members, said line being located in a plane oriented at 90* with respect to the axis of said drum members, and wherein each of the grooves comprise a pair of sidewalls and a backwall when viewed in a cross section said sidewalls being parallel to each other and perpendicular to the backwall.
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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |