Patent US4737874A successfully refreshed from Google Patents.
US4737874A
Expired / Lapsed
US
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Magnetic head assembly with decreased setting time of adhesives
Assignee: Nortel Networks Ltd
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Filing: 1985-01-24
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Granted: 1988-04-12
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Expires: 2005-01-24
Abstract
Abstract A method for decreasing the time taken for an adhesive to set is disclosed. In a small gap (e.g. 0.005 inches or less) an adhesive such as LOCTITE 420 sets in approximately two seconds. If the gap is larger than this, the set time can be as long as fifteen minutes or more. The present invention is directed to the use of a piece of corrugated material in the gap so as to provide small gaps (i.e. 0.005 inches or less) in which the adhesive can set in a short time period (of a few seconds duration). A specific application to a magnetic read/write head is disclosed.
Inventors
- 👤 Dewey M. Sims, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:06
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/10; G11B5/105; G11B5/48; G11B5/4806; G11B5/4826
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
103 words
A magnetic head assembly for tape drives and the like, comprising: a magnetic read/write head; a housing having two opposite inside walls, one on each side of the magnetic read/write head; corrugated strips between each of the two opposite walls and the adjacent surface of the magnetic read/write head; and said corrugated strips having interstices formed thereon and being bonded to the inside walls of the housing and to said adjacent surfaces of the magnetic read/write head by means of a fast curing adhesive during assembly such that curing of the adhesive occurs in the interstices between said walls and said corrugated strips.
Claim 2
Dependent Claim
103 words
A magnetic head assembly for tape drives and the like, comprising: a magnetic read/write head; a housing having two opposite inside walls, one on each side of the magnetic read/write head; corrugated strips between each of the two opposite walls and the adjacent surface of the magnetic read/write head; and said corrugated strips having interstices formed thereon and being bonded to the inside walls of the housing and to said adjacent surfaces of the magnetic read/write head by means of a fast curing adhesive during assembly such that curing of the adhesive occurs in the interstices between said walls and said corrugated strips.
Claim 3
Dependent Claim
38 words
The magnetic head assembly as defined in claim 1, wherein said corrugated strips have a normal corrugation thickness slightly larger than the distance between each of said two opposite walls and the adjacent surface of the read/write head.
Claim 4
Dependent Claim
15 words
The magnetic head assembly as defined in claim 1, wherein said corrugated strips are metal.
Claim 5
Dependent Claim
32 words
The magnetic head assembly as defined in claim 3, said fast curing adhesive being applied during assembly after said magnetic read/write head is in a predetermined azimuth orientation within a predetermined tolerance.
Claim 6
Dependent Claim
38 words
The magnetic head assembly as defined in claim 3, wherein said corrugated strips have a normal corrugation thickness slightly larger than the distance between each of said two opposite walls and the adjacent surface of the read/write head.
Claim 7
Dependent Claim
16 words
The magnetic head assembly as defined in claim 3, wherein said corrugated strips are brass strips.
Claim 8
Dependent Claim
38 words
The magnetic head assembly as defined in claim 6, wherein said corrugated strips have a normal corrugation thickness slightly larger than the distance between each of said two opposite walls and the adjacent surface of the read/write head.
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) | 1991-04-12 | 1991-10-12 | 1992-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-12 | 1995-10-12 | 1996-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-12 | 1999-10-12 | 2000-04-12 | $7700.00 | Window Closed / Lapsed |