Patent US3699302A successfully refreshed from Google Patents.
US3699302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single turn channel coil
Assignee: Park Ohio Holdings Corp
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Filing: 1971-02-24
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Granted: 1972-10-17
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Expires: 1991-02-24
Abstract
Abstract A method and apparatus for inductively heating at least a portion of the length of an elongated workpiece wherein the inductor includes a pair of parallel spaced apart conductors interconnected at one end so as to define a workpiece pass. The conductors are angularly disposed coplanar with the pass so that the workpiece is progressively preheated as it travels therethrough. Spaced from the exit area of these heating conductors is a uniforming heating conductor extending transversely around the direction of the pass over at least that portion of the element which has been progressively preheated. To provide efficient and uniform heating, the width of the uniforming heating conductor is maintained between one to one and a half times the thickness of the element. A relationship of less than this will not provide simultaneous uniforming heating for a workpiece and a relationship of greater than this decreases the flux density such that increased electrical energy is required as well as undesirably heating the adjacent workpiece.
Inventors
- 👤 Richard A Griffith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:25
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
154 words
In a single turn inductor of the type particularly useful for inductively heating at least a portion of the length of an elongated workpiece wherein said inductor includes first and second spaced apart interconnected conductors defining a workpiece pass having entrance and exit areas, said first and second conductors being angularly disposed relative to said pass to progressively heat said workpiece, the improvement comprising: a single turn inductive heating conductor interconnected with said first and second conductors and spaced adjacent thereto from said exit area for uniformly heating said portion, said single turn heating conductor comprising third and fourth interconnected conductors spaced apart from said first and second conductors along said pass and extending transverse to and coplanar with said pass to simultaneously uniformly heat said at least one portion, said third and fourth conductors having a width in the range of between one and one-half times the cross sectional dimension of said workpiece.
Claim 2
Dependent Claim
154 words
In a single turn inductor of the type particularly useful for inductively heating at least a portion of the length of an elongated workpiece wherein said inductor includes first and second spaced apart interconnected conductors defining a workpiece pass having entrance and exit areas, said first and second conductors being angularly disposed relative to said pass to progressively heat said workpiece, the improvement comprising: a single turn inductive heating conductor interconnected with said first and second conductors and spaced adjacent thereto from said exit area for uniformly heating said portion, said single turn heating conductor comprising third and fourth interconnected conductors spaced apart from said first and second conductors along said pass and extending transverse to and coplanar with said pass to simultaneously uniformly heat said at least one portion, said third and fourth conductors having a width in the range of between one and one-half times the cross sectional dimension of said workpiece.
Claim 3
Dependent Claim
186 words
An inductor for uniformly heating at least a portion of the length of an elongated workpiece, said inductor comprising: first and second interconnected spaced apart conductors defining a workpiece pass having separate entrance and exist areas, said first and second conductors being angularly disposed coplanar with said pass, whereby as said workpiece is directed along said pass, said at least a portion of said workpiece length is progressively preheated; third and fourth interconnected heating conductors spaced along said pass at said exit area from said first and second conductors coplanar with and tRansverse to said pass, whereby as said workpiece is directed along said pass, said portion is simultaneously uniformly heated to a desired temperature; means disposed along said pass between said first and second and said third and fourth conductors for further heating a segment of said portion; means for supplying high frequency electrical energy to said conductors; and, means for moving said workpiece along said pass and at least from a first position therealong immediately adjacent said third and fourth conductors to a second position therealong spaced directly between said third and fourth conductors.
Claim 4
Dependent Claim
186 words
An inductor for uniformly heating at least a portion of the length of an elongated workpiece, said inductor comprising: first and second interconnected spaced apart conductors defining a workpiece pass having separate entrance and exist areas, said first and second conductors being angularly disposed coplanar with said pass, whereby as said workpiece is directed along said pass, said at least a portion of said workpiece length is progressively preheated; third and fourth interconnected heating conductors spaced along said pass at said exit area from said first and second conductors coplanar with and tRansverse to said pass, whereby as said workpiece is directed along said pass, said portion is simultaneously uniformly heated to a desired temperature; means disposed along said pass between said first and second and said third and fourth conductors for further heating a segment of said portion; means for supplying high frequency electrical energy to said conductors; and, means for moving said workpiece along said pass and at least from a first position therealong immediately adjacent said third and fourth conductors to a second position therealong spaced directly between said third and fourth conductors.
Claim 5
Dependent Claim
31 words
The inductor as defined in claim 2 wherein the width of said third and fourth conductors along said pass is at least equal to the cross sectional dimension of said workpiece.
Claim 6
Dependent Claim
39 words
The inductor as defined in claim 3 wherein the width of said third and fourth conductors along said pass is in the range of from one to one and a half times the cross sectional dimension of said workpiece.
Claim 7
Dependent Claim
25 words
The inductor as defined in claim 2 wherein said first and second conductors extend diagonally along said pass at an angle of approximately 45* therewith.
Claim 8
Dependent Claim
163 words
In a single turn inductor of the type particularly useful for inductively heating at least a portion of the length of an elongated workpiece wherein said inductor includes first and second spaced apart interconnected conductors defining a workpiece pass entrance and exit areas, said first and second conductors being angularly disposed relative to said pass to progressively heat said workpiece, the improvement comprising: a single turn inductive heating conductor interconnected with said first and second conductors and disposed adjacent thereto from said exit area for uniformly heating said portion, said single turn heating conductor comprising third and fourth interconnected conductors each having a constant width at least equal to the cross sectional dimension of said workpiece, said third and fourth conductors extending transverse to and coplanar to said pass to simultaneously uniformly heat said at least one portion; and, means disposed along said pass between said first and second and said third and fourth conductors for further heating a segment of said portion.
Claim 9
Dependent Claim
163 words
In a single turn inductor of the type particularly useful for inductively heating at least a portion of the length of an elongated workpiece wherein said inductor includes first and second spaced apart interconnected conductors defining a workpiece pass entrance and exit areas, said first and second conductors being angularly disposed relative to said pass to progressively heat said workpiece, the improvement comprising: a single turn inductive heating conductor interconnected with said first and second conductors and disposed adjacent thereto from said exit area for uniformly heating said portion, said single turn heating conductor comprising third and fourth interconnected conductors each having a constant width at least equal to the cross sectional dimension of said workpiece, said third and fourth conductors extending transverse to and coplanar to said pass to simultaneously uniformly heat said at least one portion; and, means disposed along said pass between said first and second and said third and fourth conductors for further heating a segment of said portion.
Claim 10
Dependent Claim
53 words
The improvement as defined in claim 6 further including means for moving said workpiece progressively along said pass and at least from a first position therealong immediately adjacent said third and fourth conductors to a second position therealong directly between said third and fourth conductors, whereby all of said portion is simultaneously heated.
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |