US4129892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Back-up pressure mechanism with tensioned elongated member
Assignee: Unisys Corp
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Filing: 1977-12-19
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Granted: 1978-12-12
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Expires: 1997-12-19
Abstract
Abstract Tensioning device for use with electromagnetic read/write transducing apparatus wherein a flat elongated band or strip of non-magnetic material is arranged adjacent to a plurality of read/record heads effective to support an item adapted to move between the heads and the tensioning strip and wherein the strip is lever actuated from a relaxed, released condition relative to the heads enabling easy removal and replacement due to wear or breakage into a taut condition and including means to prevent stray magnetic flux from one transducing device from interfering with the magnetic flux of another local transducing device effectively insuring a high level signal output.
Inventors
- 👤 Abdul L. Kasu
- 👤 Jerry I. Tustaniwskyj
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:50
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/10; G11B5/11; G11B5/115; G11B15/00; G11B15/60; G11B15/62; G11B5/48
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
104 words
A demountable back-up pressure mechanism for a high speed read/write device having two or more acruately displaced electromagnetic read/with transducer members comprising: an elongated, flexible, non-magnetic member including means mounting said elongated member adjacent said transducer members effective thereby to provide constant uniform back-up pressure for the active portion of said transducers, means operably associated with said elongated non-magnetic member for selectively placing said member under tension effective to rigidify and flatten said member adjacent to said transducer members, and means for locking said elongated member in said tensioned condition and for releasing said elongated member from said tensioned condition for repair or replacement.
Claim 2
Dependent Claim
104 words
A demountable back-up pressure mechanism for a high speed read/write device having two or more acruately displaced electromagnetic read/with transducer members comprising: an elongated, flexible, non-magnetic member including means mounting said elongated member adjacent said transducer members effective thereby to provide constant uniform back-up pressure for the active portion of said transducers, means operably associated with said elongated non-magnetic member for selectively placing said member under tension effective to rigidify and flatten said member adjacent to said transducer members, and means for locking said elongated member in said tensioned condition and for releasing said elongated member from said tensioned condition for repair or replacement.
Claim 3
Dependent Claim
66 words
The invention in accordance with claim 1 wherein said means for placing said non-magnetic member under tension further comprises: arcuately arranged pressure members disposed opposite to a respective transducer member and including means for captivating stray electromagnetic flux or other stray fields emanating from said transducers, and guide means intermediate said pressure members wherein said elongated member runs across said pressure members and said guide means
Claim 4
Dependent Claim
47 words
The invention in accordance with claim 1 wherein said elongated member is a strip of resilient non-magnetic metal material with its opposite ends connected by pivot means movable to one position placing said elongated member under tension and to another position releasing said elongated member from tension.
Claim 5
Dependent Claim
43 words
The invention in accordance with claim 1 wherein said demountable back-up pressure mechanism includes oppositely disposed locating pins for reception in the assembly with which the mechanism is operably asssociated permitting said mechanism to be demountable and accurately relocated without additional adjustment thereof.
Claim 6
Dependent Claim
29 words
The invention in accordance with claim 2 including means permitting said flux captivating means to be slidably demountably removable relative to each electromagnetic transducer member for replacement or renewal.
Claim 7
Dependent Claim
38 words
The invention in accordance with claim 2 wherein said magnetic flux captivating means comprises a shaped ferrite element and wherein said movable pressure members include adjustment means providing sliding movement toward and away from the respective transducer member.
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) | 1981-12-11 | 1982-06-12 | 1982-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-11 | 1986-06-12 | 1986-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-11 | 1990-06-12 | 1990-12-12 | $7700.00 | Window Closed / Lapsed |