US3784780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method of inductively heating spaced surfaces on an elongated workpiece
Assignee: Park Ohio Holdings Corp
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Filing: 1973-01-08
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Granted: 1974-01-08
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Expires: 1993-01-08
Abstract
Abstract There is provided an apparatus and method of heating a number of axially spaced, wear surfaces on a camshaft preparatory to quench hardening the surfaces. At least two fixed inductors surrounding the camshaft simultaneously heat two or more axially spaced surfaces. The workpiece is moved successively through the two inductors until all of the wear surfaces have been inductively heated for quench hardening.
Inventors
- 👤 J Laughlin
- 👤 G Mucha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:54
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/30
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
141 words
An induction heating device for inductively heating surfaces axially spaced along an elongated workpiece having a central axis preparatory to quench hardening said surfaces, said surfaces including alternate first and second surfaces spaced axially along said elongated workpiece, first and second axially spaced inductors surrounding said workpiece, means for causing relative axial movement between said workpiece and said inductors successively from a first position to a second position and to a third position, in each of said positions said first inductor surrounding one of said first surfaces and said second inductor surrounding one of said second surfaces, means for rotating said workpiece about said central axis and means for energizing said first and second inductors in each of said positions while said workpiece is rotating whereby one of said first surfaces and one of said second surfaces are simultaneously inductively heated.
Claim 2
Dependent Claim
141 words
An induction heating device for inductively heating surfaces axially spaced along an elongated workpiece having a central axis preparatory to quench hardening said surfaces, said surfaces including alternate first and second surfaces spaced axially along said elongated workpiece, first and second axially spaced inductors surrounding said workpiece, means for causing relative axial movement between said workpiece and said inductors successively from a first position to a second position and to a third position, in each of said positions said first inductor surrounding one of said first surfaces and said second inductor surrounding one of said second surfaces, means for rotating said workpiece about said central axis and means for energizing said first and second inductors in each of said positions while said workpiece is rotating whereby one of said first surfaces and one of said second surfaces are simultaneously inductively heated.
Claim 3
Dependent Claim
49 words
An induction heating device as defined in claim 1 wherein said first surfaces each includes a number of separate wear portions extending around said workpiece and said first inductor includes a plurality of inductor elements each matching one of said number of wear portions of a given first surface.
Claim 4
Dependent Claim
64 words
An induction heating device as defined in claim 1 wherein said workpiece includes at least one wear surface different from said first and second surfaces and a third inductor surrounding said workpiece and fixed with respect to said first and second inductors and means for positioning said third inductor in coupling relationship with said one wear surface and means for energizing said third inductor.
Claim 5
Dependent Claim
39 words
A device as defined in claim 3 wherein said means for energizing said first and second inductor includes a first alternating current transformer connected to said first inductor and a second alternating current transformer connected to said second inductor.
Claim 6
Dependent Claim
19 words
A device as defined in claim 4 including means for selectively and individually energizing said first and second transformers.
Claim 7
Dependent Claim
21 words
A device as defined in claim 4 wherein said means for energizing said third inductor includes a third alternating current transformer.
Claim 8
Dependent Claim
20 words
A device as defined in claim 6 including means for selectively and individually energizing said first, second and third transformers.
Claim 9
Dependent Claim
30 words
A device as defined in claim 1 wherein said means for causing relative axial movement includes means for moving said workpiece coaxially with respect to said first and second inductors.
Claim 10
Dependent Claim
29 words
A device as defined in claim 8 wherein said workpiece moving means includes control means for successively stopping said workpiece moving means at said first, second and third positions.
Claim 11
Dependent Claim
179 words
An induction heating device for inductively heating bearing surfaces axially spaced along an elongated workpiece preparatory to quench hardening said surfaces, said surfaces being arranged in an axially spaced group of similar surfaces each group having a selected number of said similar surfaces and axially spaced individual surfaces, said groups being separated by at least one of said individual surfaces and at least some of said individual surfaces being spaced a predetermined distance from at least some of said groups of surfaces, said device comprising: a first set of fixed inductor means surrounding said workpiece for inductively heating simultaneously said surfaces in one of said groups, an individual fixed inductor surrounding said workpiece and spaced from said set of inductors generally said predetermined distances, means for shifting said workpiece with respect to said set of inductor means and said individual inductor successively with different groups of surfaces and different individual surfaces aligned with said set of inductor means and said inductor respectively and means for energizing said inductor means and said individual inductors after said workpiece has been shifted.
Claim 12
Dependent Claim
179 words
An induction heating device for inductively heating bearing surfaces axially spaced along an elongated workpiece preparatory to quench hardening said surfaces, said surfaces being arranged in an axially spaced group of similar surfaces each group having a selected number of said similar surfaces and axially spaced individual surfaces, said groups being separated by at least one of said individual surfaces and at least some of said individual surfaces being spaced a predetermined distance from at least some of said groups of surfaces, said device comprising: a first set of fixed inductor means surrounding said workpiece for inductively heating simultaneously said surfaces in one of said groups, an individual fixed inductor surrounding said workpiece and spaced from said set of inductors generally said predetermined distances, means for shifting said workpiece with respect to said set of inductor means and said individual inductor successively with different groups of surfaces and different individual surfaces aligned with said set of inductor means and said inductor respectively and means for energizing said inductor means and said individual inductors after said workpiece has been shifted.
Claim 13
Independent Claim
148 words
A method of inductively heating a series of circumferentially extending, axially spaced wear surfaces on a camshaft preparatory to quench hardening, said method comprising the steps of: a. providing first and second inductors spaced axially of said camshaft and surrounding said camshaft; b. simultaneously locating said first inductor in coupling relationship with a first of said surfaces and said second inductor in coupling relationship with a second of said surfaces; c. energizing said inductors by an alternating current while said camshaft is rotating whereby said first and second surfaces are inductively heated; d. then simultaneously locating said first inductor in coupling relationship with a third of said surfaces and said second inductor in coupling relationship with a fourth of said surfaces; and, e. again energizing said first and second inductors by an alternating current while said camshaft is rotating whereby said third and fourth surfaces are inductively heated.
Claim 14
Independent Claim
148 words
A method of inductively heating a series of circumferentially extending, axially spaced wear surfaces on a camshaft preparatory to quench hardening, said method comprising the steps of: a. providing first and second inductors spaced axially of said camshaft and surrounding said camshaft; b. simultaneously locating said first inductor in coupling relationship with a first of said surfaces and said second inductor in coupling relationship with a second of said surfaces; c. energizing said inductors by an alternating current while said camshaft is rotating whereby said first and second surfaces are inductively heated; d. then simultaneously locating said first inductor in coupling relationship with a third of said surfaces and said second inductor in coupling relationship with a fourth of said surfaces; and, e. again energizing said first and second inductors by an alternating current while said camshaft is rotating whereby said third and fourth surfaces are inductively heated.
Claim 15
Dependent Claim
58 words
A method as defined in claim 11 including the additional step of: f. simultaneously locating said first inductor in coupling relationship with a fifth surface and said second inductor in coupling relationship with a sixth surface; and, g. again energizing said first and second inductors by an alternating current whereby said fifth and sixth surfaces are inductively heated.
Claim 16
Dependent Claim
28 words
A method as defined in claim 12 wherein said first, third and fifth surfaces and said second, fourth and sixth surfaces are located in succession along said camshaft.
Claim 17
Independent Claim
71 words
A method of heating a series of circumferentially extending, axially spaced surfaces on an elongated workpiee, said method includes the steps of: a. simultaneously heating inductively at least two of said surfaces while rotating said workpiece; b. then simultaneously heating inductively at least two additional surfaces while rotating said workpiece; and, c. repeating said simultaneous heating steps and rotation of said workpiece until approximately all of said surfaces have been heated.
Claim 18
Independent Claim
71 words
A method of heating a series of circumferentially extending, axially spaced surfaces on an elongated workpiee, said method includes the steps of: a. simultaneously heating inductively at least two of said surfaces while rotating said workpiece; b. then simultaneously heating inductively at least two additional surfaces while rotating said workpiece; and, c. repeating said simultaneous heating steps and rotation of said workpiece until approximately all of said surfaces have been heated.
References Cited (Backward Citations)
US2255103A
Cited
US2794894A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |