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US3685216A Expired / Lapsed US ⏱️ 0.0 years remaining

Slider bearing surface generation

Assignee: Honeywell Inc
•
Filing: 1970-01-14
•
Granted: 1972-08-22
•
Expires: 1990-01-14
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Abstract

Abstract A method of generating the bearing surface on a ''''flying'''' magnetic recording head. The desired bearing surface is of compound curvature, having a significant crown along an axis parallel to the flying direction and a lesser concavity along an axis transverse to the flying direction. The bearing surface is produced by lapping an essential element of the head, henceforth called ''''slider'''' against a control surface. In a first embodiment of the method, the control surface comprises a thin sheet of glass, metal or ceramic distorted to a contour which is the inverse, or converse, of the desired shape; and the slider is lapped against the control surface using a combined lateral and cross-lateral motion, Alternatively, the slider may be clamped so as to distort it to a contour which is the inverse of the desired surface contour, lapped against a planar control surface, and then released from the clamp whereby the unstressed slider will have a bearing surface contour of the desired shape.

Inventors

  • 👤 Karl A Frey
  • 👤 Warner F Schliffke

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 21:03
CPC Classifications
B; B24; B24B; B24B37/00; B24B37/04; B24B37/048; B24B11/00; B24B19/00; B24B19/26

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 102 words
A method for producing a compound curved surface from a relatively flat blank comprising: a. forming the inverse of a desired contour on an abrading surface by 1. providing a relatively rectangular abrading surface, 2. clamping said abrading surface to a flat rigid surface at the mid-points of one opposite pair of sides, 3. raising the mid-points of an opposite pair of sides until the inverse of said desired contour is produced, b. moving said blank in an abrading relation to said abrading surface in a first direction, and c. reciprocating said blank in a second direction transverse to said first direction.
Claim 2
Independent Claim 102 words
A method for producing a compound curved surface from a relatively flat blank comprising: a. forming the inverse of a desired contour on an abrading surface by 1. providing a relatively rectangular abrading surface, 2. clamping said abrading surface to a flat rigid surface at the mid-points of one opposite pair of sides, 3. raising the mid-points of an opposite pair of sides until the inverse of said desired contour is produced, b. moving said blank in an abrading relation to said abrading surface in a first direction, and c. reciprocating said blank in a second direction transverse to said first direction.
Claim 3
Dependent Claim 18 words
clamping said abrading surface to a flat rigid surface at the mid-points of one opposite pair of sides,
Claim 4
Dependent Claim 18 words
clamping said abrading surface to a flat rigid surface at the mid-points of one opposite pair of sides,
Claim 5
Dependent Claim 17 words
A method as in claim 1 wherein said movement in said first direction is a reciprocating movement.
Claim 6
Dependent Claim 16 words
A method as set forth in claim 1 wherein said abrading surface is ceramic coated steel.
Claim 7
Dependent Claim 48 words
raising the mid-points of an opposite pair of sides until the inverse of said desired contour is produced, b. moving said blank in an abrading relation to said abrading surface in a first direction, and c. reciprocating said blank in a second direction transverse to said first direction.
Claim 8
Dependent Claim 48 words
raising the mid-points of an opposite pair of sides until the inverse of said desired contour is produced, b. moving said blank in an abrading relation to said abrading surface in a first direction, and c. reciprocating said blank in a second direction transverse to said first direction.
Claim 9
Dependent Claim 21 words
A method as set forth in claim 1 wherein said blank is a recording head slider blank containing a magnetic core.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-08-22 1976-02-21 1976-08-22 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-08-22 1980-02-21 1980-08-22 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-08-22 1984-02-21 1984-08-22 $7700.00 Window Closed / Lapsed

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