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Patent US3980853A successfully refreshed from Google Patents.
US3980853A
Expired / Lapsed
US
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Inductive body for high frequency induction heating
Assignee: Daido Metal Co Ltd
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Filing: 1975-02-24
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Granted: 1976-09-14
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Expires: 1995-02-24
Abstract
Abstract An inductive body for high frequency induction heating of cylindrical work piece being equipped with at least one collar portion. The inductive body has at least one gap of specific dimensions opposing the collar portion, so as to avoid local density of magnetic flux within the article to be heated.
Inventors
- 👤 Nobukazu Morisaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:08
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/36; H05B6/40
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
150 words
A single-layer cylindrical induction coil for high-frequency heating of a cylindrical metal work piece for making slide bearing having at least an end collar on the circumference at the axial end thereof; the induction coil completely surrounding the work piece, the axial length of the induction coil being equal to that of the work piece, and having at least at the axial end thereof opposing to the end collar of the work piece which is rotatable during heating a portion defining at least a rectangular notch axial length x of which is in a range of from one third to four times the axial length of the collar of the work piece while the circumferential length y or sum of the circumferential lengths y of said rectangular notch or notches are in a range of one quarter to three quarters of the length of the circumference of the induction coil.
Claim 2
Dependent Claim
150 words
A single-layer cylindrical induction coil for high-frequency heating of a cylindrical metal work piece for making slide bearing having at least an end collar on the circumference at the axial end thereof; the induction coil completely surrounding the work piece, the axial length of the induction coil being equal to that of the work piece, and having at least at the axial end thereof opposing to the end collar of the work piece which is rotatable during heating a portion defining at least a rectangular notch axial length x of which is in a range of from one third to four times the axial length of the collar of the work piece while the circumferential length y or sum of the circumferential lengths y of said rectangular notch or notches are in a range of one quarter to three quarters of the length of the circumference of the induction coil.
Claim 3
Dependent Claim
140 words
A single-layer cylindrical induction coil for high frequency heating of a cylindrical metal work piece for making slide bearing having at least a collar in the circumference thereof; the induction coil completely surrounding the work piece, the axial length of the induction coil being equal to that of the work piece, and having in the circumference thereof opposing to the collar of the work piece which is rotatable during heating a portion defining at least an aperture axial length x of which is in the range of from one third to four times the axial length of the collar of the work piece while the circumferential length of the aperture y or the sum of the circumferential length of said apertures is in a range of from one quarter to three quarters of the circumferential length of the induction coil.
Claim 4
Dependent Claim
140 words
A single-layer cylindrical induction coil for high frequency heating of a cylindrical metal work piece for making slide bearing having at least a collar in the circumference thereof; the induction coil completely surrounding the work piece, the axial length of the induction coil being equal to that of the work piece, and having in the circumference thereof opposing to the collar of the work piece which is rotatable during heating a portion defining at least an aperture axial length x of which is in the range of from one third to four times the axial length of the collar of the work piece while the circumferential length of the aperture y or the sum of the circumferential length of said apertures is in a range of from one quarter to three quarters of the circumferential length of the induction coil.
Claim 5
Dependent Claim
110 words
A hollow cylindrical inductive body according to claim 2, wherein the aperture having a single elliptical, semi-elliptical or circular shape and axis of the elliptical or semi-elliptical aperture in the axial direction x or the diameter of the aperture of circular shape is in a range of from one third to four times the axial length of the collar of the work piece and further the opening area of the aperture lies within that obtained by the product of the values of x and y (x.sup.. y) or the product of x and Σ y (x.sup.. Σ y) defined as for rectangular notch or notches as recited in claim 2.
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) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |