Patent FR549862A successfully refreshed from Google Patents.
Patent US4152742A successfully refreshed from Google Patents.
US4152742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Back bar retainer for magnetic head
Assignee: Nortronics Co Inc
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Filing: 1977-10-31
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Granted: 1979-05-01
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Expires: 1997-10-31
Abstract
Abstract A spring retaining clip resiliently urges the back bar core piece of a magnetic head assembly into contact with the back ends of two other core pieces whose front ends define the head gap. Use of the clip permits installation of the head coil on one of the core pieces and installation of the back bar after the core pieces have been secured, ground and lapped in the head housing, thus simplifying the manufacturing process. In a preferred embodiment the retainer clip has a first surface member for engaging or being glued to the side of the back bar, and a pair of resilient tabs for engaging the back ends of the pole pieces when the back bar is installed with the clip holding the back bar and the pole pieces tightly together. A grounding wire for the core can be soldered to the retaining clip.
Inventors
- 👤 Leonard E. Kronfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:34
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/1272
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
161 words
A magnetic head assembly, comprising: first and second magnetic core pieces having first ends adapted to cojointly define a read, write or erase gap and having other ends with flat sides for contacting a back bar; means for positioning and securing said first and second core pieces with their first ends adjacent one another to define said gap; a coil positioned around at least one of said core pieces; a back bar core piece of rectangular section for positioning in contact with the other ends of both said first and second core pieces to complete the magnetic circuit; and a retaining clip having a first surface member for engaging a side of said back bar, and having a pair of resilient tabs for engaging said other ends of said first and second core pieces, so as to hold the other side of the back bar in contact with the flat sides of said other ends of first and second core pieces.
Claim 2
Dependent Claim
161 words
A magnetic head assembly, comprising: first and second magnetic core pieces having first ends adapted to cojointly define a read, write or erase gap and having other ends with flat sides for contacting a back bar; means for positioning and securing said first and second core pieces with their first ends adjacent one another to define said gap; a coil positioned around at least one of said core pieces; a back bar core piece of rectangular section for positioning in contact with the other ends of both said first and second core pieces to complete the magnetic circuit; and a retaining clip having a first surface member for engaging a side of said back bar, and having a pair of resilient tabs for engaging said other ends of said first and second core pieces, so as to hold the other side of the back bar in contact with the flat sides of said other ends of first and second core pieces.
Claim 3
Dependent Claim
17 words
A magnetic head assembly according to claim 1 including a grounding wire connected to said retaining clip.
Claim 4
Dependent Claim
27 words
A magnetic head assembly according to claim 1 wherein said first surface member of said retaining clip is adhesively secured to the side of the back bar.
Claim 5
Dependent Claim
64 words
A magnetic head assembly according to claim 3 wherein said tabs have bridge portions extending from the first surface member of the clip, across the back bar and ends of the core pieces when assembled, and wherein said tabs have core contacting portions extending from the bridge portions in the same direction as the first surface member for resiliently contacting said core piece ends.
Claim 6
Dependent Claim
36 words
A magnetic head assembly according to claim 4 wherein the outer ends of the core contacting portions of said clip are bent at an acute angle to facilitate installation of the clip on the core pieces.
Claim 7
Dependent Claim
22 words
A magnetic head assembly according to claim 4 including a grounding wire soldered to the bridge portion of one of said tabs.
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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) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |