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US3694609A
Expired / Lapsed
US
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Method and apparatus for inductive heating
Assignee: OI Glass Inc
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Filing: 1971-02-01
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Granted: 1972-09-26
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Expires: 1991-02-01
Abstract
Abstract Method and apparatus for exercising effective electromagnetic influence across an entire planar surface of an electrically conductive object to inductively heat the planar surface when the dimensions of the planar surface exceed the effective limits of a field provided by opposite runs of an inductive heating coil. The method and apparatus is particularly applicable to sealing widemouth containers by bonding across and to the container finish a closure member. An assembly of the closure member, thermoplastic bonding material and the container finish is conveyed in a linear direction past the novel inductive heating coil. The heating coil acts to shift the effective magnetic influence of the coil across the path without physically moving the coil. Novel structures of inductive heating coils are also disclosed.
Inventors
- 👤 Leo J Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:52
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/10; H05B6/105; H05B6/107; B; B65; B65B; B65B51/00; B65B51/10; B65B51/22; B65B51/227; B65B7/00; B65B7/16; B65B7/28; B65B7/2842; B65B7/2878; B29; B29C; B29C65/00; B29C65/02; B29C65/34; B29C65/36; B29C65/3604; B29C65/3644; B29C65/3668; B29C65/3672; B29C65/3676; B29C65/368; B29C65/78; B29C65/7858; B29C65/7861; B29C65/787; B29C66/00; B29C66/50; B29C66/51; B29C66/54; B29C66/542; B29C66/80; B29C66/83; B29C66/836
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
320 words
An inductive heating coil for connection to a source of inductive heating current for heating a planar surface of a conductive material comprising a. a conductor shaped into a plurality of elongated turns forming a layer coil, one side of said layer defining a plane for disposition in inductive heating relationship adjacent and substantially parallel to a planar path defined by movement of a planar surface in a linear direction, b. the elongated turns of said layer having a major axis for disposition substantially parallel to the linear direction of movement of the planar surface in defining said planar path, c. said elongated turns including first and second runs extending generally longitudinally on first and second sides of said major axis, respectively, d. one of said first and second runs having first conductor portion means positioned sufficiently close to said major axis of said layer to permit the exercise of effective electromagnetic influence when current is passing therethrough on said planar path adjacent the major axis but not on the outer edges of said planar path, e. another of said first and second runs having second conductor portion means spaced from the major axis of said layer to permit the exercise of effective electromagnetic influence when current is passing therethrough on at least one outside edge of said planar path but not on that part of said planar path adjacent the major axis of said layer, f. said first and second conductor portion means of said first and second runs being connected by third conductor portion means extending generally obliquely across said layer with respect to said major axis to permit the exercise of effective electromagnetic influence in response to current flow therethrough generally obliquely across said planar path between the outside edges of said planar path, whereby effective magnetic influence is shifted transversely across a planar surface moving through said planar path to effectively heat the entire planar surface.
Claim 2
Dependent Claim
320 words
An inductive heating coil for connection to a source of inductive heating current for heating a planar surface of a conductive material comprising a. a conductor shaped into a plurality of elongated turns forming a layer coil, one side of said layer defining a plane for disposition in inductive heating relationship adjacent and substantially parallel to a planar path defined by movement of a planar surface in a linear direction, b. the elongated turns of said layer having a major axis for disposition substantially parallel to the linear direction of movement of the planar surface in defining said planar path, c. said elongated turns including first and second runs extending generally longitudinally on first and second sides of said major axis, respectively, d. one of said first and second runs having first conductor portion means positioned sufficiently close to said major axis of said layer to permit the exercise of effective electromagnetic influence when current is passing therethrough on said planar path adjacent the major axis but not on the outer edges of said planar path, e. another of said first and second runs having second conductor portion means spaced from the major axis of said layer to permit the exercise of effective electromagnetic influence when current is passing therethrough on at least one outside edge of said planar path but not on that part of said planar path adjacent the major axis of said layer, f. said first and second conductor portion means of said first and second runs being connected by third conductor portion means extending generally obliquely across said layer with respect to said major axis to permit the exercise of effective electromagnetic influence in response to current flow therethrough generally obliquely across said planar path between the outside edges of said planar path, whereby effective magnetic influence is shifted transversely across a planar surface moving through said planar path to effectively heat the entire planar surface.
Claim 3
Dependent Claim
80 words
An inductive heating coil as defined in claim 1 which further includes a. said plurality of turns of said conductor following substantially the same configuration in said layer, and b. a split, single turn metallic sheath secondary extending around and in the same configuration as said turns of said conductor and on the side of said layer to be located adjacent said paTh, c. said single turn secondary being electrically and mechanically secured to one of said plurality of turns.
Claim 4
Dependent Claim
263 words
An inductive heating coil for connection to a source of inductive heating current for heating a planar surface of a conductive material, comprising a. a conductor shaped into a plurality of elongated turns forming a layer-like inductive heating coil; b. said elongated layer-like heating coil having longitudinally extending first and second runs of said turns, at least one of said runs being disposed in inductive heating relationship in a plane adjacent and substantially parallel to a planar path defined by movement of a planar surface to be heated, and means for connecting said first and second runs to enable flow of inductive heating current therethrough; c. said first and second runs having first conductor portion means positioned in said plane to permit electromagnetic inductive heating of the edges of said planar path, but not the part of said planar path between the edges thereof; d. said first and second runs having second conductor portion means positioned in said plane to permit electromagnetic inductive heating across the planar path but not at both edges of the path at the same time; e. said second conductor portion means extending obliquely with respect to the planar path across the plane parallel to the planar path so that electromagnetic inductive heating is permitted across the entire width of said planar path between said edges; f. said first and said second conductor portion means being connected to enable flow of inductive heating current therethrough and in said first and second runs, thereby enabling the heating of the entire surface of said planar surface passed along said planar path.
Claim 5
Dependent Claim
263 words
An inductive heating coil for connection to a source of inductive heating current for heating a planar surface of a conductive material, comprising a. a conductor shaped into a plurality of elongated turns forming a layer-like inductive heating coil; b. said elongated layer-like heating coil having longitudinally extending first and second runs of said turns, at least one of said runs being disposed in inductive heating relationship in a plane adjacent and substantially parallel to a planar path defined by movement of a planar surface to be heated, and means for connecting said first and second runs to enable flow of inductive heating current therethrough; c. said first and second runs having first conductor portion means positioned in said plane to permit electromagnetic inductive heating of the edges of said planar path, but not the part of said planar path between the edges thereof; d. said first and second runs having second conductor portion means positioned in said plane to permit electromagnetic inductive heating across the planar path but not at both edges of the path at the same time; e. said second conductor portion means extending obliquely with respect to the planar path across the plane parallel to the planar path so that electromagnetic inductive heating is permitted across the entire width of said planar path between said edges; f. said first and said second conductor portion means being connected to enable flow of inductive heating current therethrough and in said first and second runs, thereby enabling the heating of the entire surface of said planar surface passed along said planar path.
Claim 6
Dependent Claim
123 words
An inductive heating coil as defined in claim 3 in which a. said first run of said coil comprises one part starting adjacent one outside edge of said planar path and includes at least one excursion obliquely toward and then away from said major axis, and a second part which extends linearly adjacent said one outside edge, and in which b. said second run of said coil comprises one part opposite said one part of said first run which extends linearly adjacent the other outside edge of said planar path, and a second part opposite said second part of said first run starting adjacent said other outside edge and includes at least one excursion obliquely toward and then away from said major axis.
Claim 7
Dependent Claim
33 words
An inductive heating coil as defined in claim 4 in which said first and second runs each further include linearly extending sections adjacent said major axis connecting the inner reaches of each excursion.
Claim 8
Dependent Claim
55 words
An inductive heating coil as defined in claim 3 in which said first and second runs of said coil each start adjacent their respective outside edge of said path and continue obliquely inwardly toward each other and said major axis until the major axis is under effective magnetic influence when current flows through said runs.
Claim 9
Dependent Claim
43 words
An inductive heating coil as defined in claim 6 in which said first and second runs continue from their innermost position obliquely outwardly away from each other and said major axis returning to a position adjacent their respective outer edge of said path.
Claim 10
Dependent Claim
44 words
An inductive heating coil as defined in claim 3 in which said first and second runs of said coil each start adjacent said major axis and continue obliquely outwardly away from each other to a position adjacent their respective outer edge of said path.
Claim 11
Dependent Claim
45 words
An inductive heating coil as defined in claim 8 in which said first and second runs continue from their outermost position obliquely inwardly toward each other and said major axis until the major axis is under effective magnetic influence when current flows through said runs.
Claim 12
Dependent Claim
77 words
An inductive heating coil as defined in claim 3 in which a. one of said first and second runs of said coil starts adjacent said major axis and continues obliquely outwardly to a Position adjacent its respective outer edge of said path, and in which b. the other of said first and second runs of said coil starts adjacent its respective outer edge of said path and continues obliquely inwardly to a position adjacent said major axis.
Claim 13
Dependent Claim
306 words
Apparatus for sealing wide-mouth containers by bonding across and to the container finish a closure member, comprising a. means for conveying a container assembly having a thermoplastic bonding material held in place between a closure member and the container finish, and a substantially planar metallic susceptor disposed in conductive heating relationship with the bonding material, in a direction so that the movement of said planar susceptor defines a substantially planar path; b. a conductor formed into an elongated turn as an inductive heating coil, said coil having means for connecting inductive heating current thereto; c. said elongated heating coil having longitudinally extending first and second runs, at least one of said runs being disposed in inductive heating relationship in a plane adjacent and substantially parallel to said planar path defined by movement of said planar surface to be heated, and means for connecting said first and second runs to enable flow of inductive heating current therethrough; d. said turn having first conductor portion means positioned in said plane to permit electromagnetic inductive heating of the edges of said planar path, but not the part of said planar path between the edges thereof; e. said turn also having second conductor portion means positioned in said plane to permit electromagnetic inductive heating across the planar path but not at the edges of said planar path; f. said second conductor portion means extending obliquely with respect to the planar path across the plane parallel to the planar path so that electromagnetic inductive heating is permitted across the entire width of said planar path between said edges; g. said first and said second conductor portion means being connected to enable flow of inductive heating current therethrough and in said first and second runs, thereby enabling the heating of the entire surface of said planar surface passed along said planar path.
Claim 14
Dependent Claim
306 words
Apparatus for sealing wide-mouth containers by bonding across and to the container finish a closure member, comprising a. means for conveying a container assembly having a thermoplastic bonding material held in place between a closure member and the container finish, and a substantially planar metallic susceptor disposed in conductive heating relationship with the bonding material, in a direction so that the movement of said planar susceptor defines a substantially planar path; b. a conductor formed into an elongated turn as an inductive heating coil, said coil having means for connecting inductive heating current thereto; c. said elongated heating coil having longitudinally extending first and second runs, at least one of said runs being disposed in inductive heating relationship in a plane adjacent and substantially parallel to said planar path defined by movement of said planar surface to be heated, and means for connecting said first and second runs to enable flow of inductive heating current therethrough; d. said turn having first conductor portion means positioned in said plane to permit electromagnetic inductive heating of the edges of said planar path, but not the part of said planar path between the edges thereof; e. said turn also having second conductor portion means positioned in said plane to permit electromagnetic inductive heating across the planar path but not at the edges of said planar path; f. said second conductor portion means extending obliquely with respect to the planar path across the plane parallel to the planar path so that electromagnetic inductive heating is permitted across the entire width of said planar path between said edges; g. said first and said second conductor portion means being connected to enable flow of inductive heating current therethrough and in said first and second runs, thereby enabling the heating of the entire surface of said planar surface passed along said planar path.
Claim 15
Dependent Claim
120 words
Apparatus as defined in claim 11 in which a. said first run of said coil comprises one part starting adjacent one outside edge of said planar path and includes at least one excursion obliquely toward and then away from said major axis, and a second part which extends linearly adjacent said one outside edge, and in which b. said second run of said coil comprises one part opposite said one part of said first run which extends linearly adjacent the other outside edge of said planar path, and a second part opposite said second part of said first run starting adjacent said other outside edge and includes at least one excursion obliquely toward and then away from said major axis.
Claim 16
Dependent Claim
30 words
Apparatus as defined in claim 12 in which said first and second runs each further include linearly extending sections adjacent said major axis connecting the inner reaches of each excursion.
Claim 17
Dependent Claim
52 words
Apparatus as defined in claim 11 in which said first and second runs of said coil each start adjacent their respective outside edge of said path and continue obliquely inwardly toward each other and said major axis until the major axis is under effective magnetic influence when current flows through said runs.
Claim 18
Dependent Claim
40 words
Apparatus as defined in claim 14 in which said first and second runs continue from their innermost position obliquely outwardly away from each other and said major axis returning to a position adjacent their respective outer edge of said path.
Claim 19
Dependent Claim
41 words
Apparatus as defined in claim 11 in which said first and second runs of said coil each start adjacent said major axis and continue obliquely outwardly away from each other to a position adjacent their respective outer edge of said path.
Claim 20
Dependent Claim
42 words
Apparatus as defined in claim 16 in which said first and second runs contInue from their outermost position obliquely inwardly toward each other and said major axis until the major axis is under effective magnetic influence when current flows through said runs.
Claim 21
Dependent Claim
74 words
Apparatus as defined in claim 11 in which a. one of said first and second runs of said coil starts adjacent said major axis and continues obliquely outwardly to a position adjacent its respective outer edge of said path, and in which b. the other of said first and second runs of said coil starts adjacent its respective outer edge of said path and continues obliquely inwardly to a position adjacent said major axis.
Claim 22
Dependent Claim
106 words
Apparatus as defined in claim 11 in which a. the closure member is in the form of a laminated disc coated with the thermoplastic bonding material at least on its interface with the container finish, and which further includes metallic foil as the susceptor as a laminate at least in the area of the disc adjacent the thermoplastic bonding material, and which further includes b. current supplying means for supplying a magnitude and frequency of inductive heating current that cooperates with the number of turns in said coil to activate the bonding material by heating said susceptor without damaging the laminated disc or the container finish.
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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |