US4058843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Head and gimbal assembly
Assignee: Unisys Corp
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Filing: 1975-07-03
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Granted: 1977-11-15
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Expires: 1995-07-03
Abstract
Abstract A magnetic transducer head adapted for flying on a fluid atmospheric bearing and a gimbal mounting device comprising a spring structure including an inner spring element secured to the head for inhibiting movement thereof in directions parallel with a plane therethrough and including an outer spring element coupled to the inner element and adapted to restrain rotation movement of the head about a pivot point thereon, the inner element being oriented in a plane coextensive with the line through the center of mass of the head and the head having a load point approximating the center of mass.
Inventors
- 👤 Ko Ko Gyi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:37
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/60
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
126 words
In combination: a transducer head constructed and arranged for flying on a fluid bearing in close proximity to a transducing surface; gimbal supporting means to which said head is mounted for flyng so as to provide flexural freedom of rotation of said head around predetermined axes parallel to said surface while restraining rotation of said head about an axis perpendicular to said surface and also restraining motion of said head in a direction parallel to said surface; and head actuating means for applying a loading force to said head to urge said head toward said surface in a direction perpendicular thereto, said actuating means contacting said head in a plane which is coplanar with the center of mass of said head and parallel to said surface.
Claim 2
Dependent Claim
126 words
In combination: a transducer head constructed and arranged for flying on a fluid bearing in close proximity to a transducing surface; gimbal supporting means to which said head is mounted for flyng so as to provide flexural freedom of rotation of said head around predetermined axes parallel to said surface while restraining rotation of said head about an axis perpendicular to said surface and also restraining motion of said head in a direction parallel to said surface; and head actuating means for applying a loading force to said head to urge said head toward said surface in a direction perpendicular thereto, said actuating means contacting said head in a plane which is coplanar with the center of mass of said head and parallel to said surface.
Claim 3
Dependent Claim
48 words
The invention in accordance with claim 1, wherein said gimbal means comprises a flat gimbal spring, and wherein said head includes mounting portions for mounting said head to said gimbal spring so that the plane of said gimbal spring passes through the center of mass of said head.
Claim 4
Dependent Claim
44 words
The invention in accordance with claim 1, wherein said actuating means comprises a plunger which is constructed and arranged to pass through an aperture in said head located so that said loading force is applied at approximately the center of mass of said head.
Claim 5
Dependent Claim
78 words
The invention in accordance with claim 3, wherein said gimbal means comprises an outer spring element and an inner spring element attached to said outer spring element at oppositely disposed locations along a first axis parallel to the relative direction of motion between said head and said surface, and wherein said inner spring element includes oppositely disposed inwardly extending projections located along a second axis perpendicular to said first axis for receiving the mounting portions of said head.
Claim 6
Dependent Claim
76 words
The invention in accordance with claim 4, wherein said outer and inner elements have a generally rectangular symmetrical configuration, wherein said inner and outer spring elements are attached at first oppositely disposed corners of said rectangular configuration, wherein said inwardly extending projections from said inner element project inwardly from second oppositely disposed corners of said rectangular configuration, and wherein said plunger is applied in a direction intersecting the geometrical center of said inner and outer elements.
Claim 7
Dependent Claim
45 words
The invention in accordance with claim 5, wherein said head contains oppositely disposed lateral ear portions extending therefrom and containing surfaces which are coplanar with said center of mass, and wherein said coplanar surfaces of said ear portions are attached to said inwardly extending projections.
Claim 8
Dependent Claim
36 words
The invention in accordance with claim 2, wherein said loading force is applied to said head along a line approximately intersecting the center of mass of said head and the geometric center of said gimbal spring.
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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) | 1980-11-14 | 1981-05-16 | 1981-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-14 | 1985-05-16 | 1985-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-14 | 1989-05-16 | 1989-11-15 | $7700.00 | Window Closed / Lapsed |