US3740859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drying system
Assignee: Interlake Steel Corp
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Filing: 1971-06-03
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Granted: 1973-06-26
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Expires: 1991-06-03
Abstract
Abstract A system for continously applying paint to a continuously moving metal strap and thereafter continuously drying the paint on the metal strap. The system disclosed herein includes a drying station disposed above the paint pot includes a number of induction coils through which the painted metal straps pass and have induced therein eddy currents which heat the metal strap to dry the paint thereon. Means are provided automatically to maintain the level of the paint and the concentration of solids in the paint contained in the paint pot, and means are provided automatically to vary the output from the induction coils in response to the speed and temperature of the metal strap to maintain constant the temperature of the metal strap exiting from the drying station.
Inventors
- 👤 R Patton
- 👤 V Beaucaire
- 👤 L Marlin
- 👤 N Keyser
- 👤 V Langdon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:03
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; C; C25; C25D; C25D13/00; C25D13/12; C25D13/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
167 words
A system for continuously drying a painted continuously moving metal strap, said system comprising a drying station including an induction coil for heating the metal strap to dry the paint thereon, drive mechanism for continuously passing the metal strap through said induction heating coil, a variable power supply for said induction heating coil for controlling the output therefrom, means for sensing the speed of movement of the metal strap with respect to said induction heating coil, means for sensing the temperature of the painted metal strap immediately after the passage thereof from said induction heating coil, and a control circuit responsive to said metal strap speed sensing means and to said painted metal strap temperature sensing means for controlling said variable power supply and thus the heating produced by said induction heating coil to heat the painted metal strap to a predetermined temperature at said temperature sensing means, whereby to dry the paint on the metal strap throughout the length thereof passing through said induction heating coil.
Claim 2
Independent Claim
167 words
A system for continuously drying a painted continuously moving metal strap, said system comprising a drying station including an induction coil for heating the metal strap to dry the paint thereon, drive mechanism for continuously passing the metal strap through said induction heating coil, a variable power supply for said induction heating coil for controlling the output therefrom, means for sensing the speed of movement of the metal strap with respect to said induction heating coil, means for sensing the temperature of the painted metal strap immediately after the passage thereof from said induction heating coil, and a control circuit responsive to said metal strap speed sensing means and to said painted metal strap temperature sensing means for controlling said variable power supply and thus the heating produced by said induction heating coil to heat the painted metal strap to a predetermined temperature at said temperature sensing means, whereby to dry the paint on the metal strap throughout the length thereof passing through said induction heating coil.
Claim 3
Dependent Claim
21 words
The system set forth in claim 1, wherein said induction heating coil is operated at a frequency of about 200 kilohertz.
Claim 4
Dependent Claim
30 words
The system set forth in claim 1, wherein said drive mechanism is adapted to pass the metal strap through said induction heating coil at a speed of about 500 feet/min.
Claim 5
Independent Claim
205 words
A system for continuously drying a painted continuously moving metal strap, said system comprising a drying station including an induction coil for heating the metal strap to dry the paint thereon, drive mechanism for continuously passing the metal strap through said induction heating coil, a variable power supply for said induction heating coil for controlling the output therefrom, means for sensing the speed of movement of the metal strap with respect to said induction heating coil, means for sensing the temperature of the painted metal strap immediately after the passage thereof from said induction heating coil, and a control circuit responsive to said metal strap speed sensing means and to said painted metal strap temperature sensing means for controlling said variable power supply and thus the heating produced by said induction heating coil to heat the painted metal strap to a predetermined temperature at said temperature sensing means, said control circuit including limit means responsive to said metal strap speed sensing means for deenergizing said induction heating coil when the speed of the metal strap with respect to said induction coil is below a predetermined value, whereby to dry the paint on the metal strap throughout the length thereof passing through said induction heating coil.
Claim 6
Independent Claim
205 words
A system for continuously drying a painted continuously moving metal strap, said system comprising a drying station including an induction coil for heating the metal strap to dry the paint thereon, drive mechanism for continuously passing the metal strap through said induction heating coil, a variable power supply for said induction heating coil for controlling the output therefrom, means for sensing the speed of movement of the metal strap with respect to said induction heating coil, means for sensing the temperature of the painted metal strap immediately after the passage thereof from said induction heating coil, and a control circuit responsive to said metal strap speed sensing means and to said painted metal strap temperature sensing means for controlling said variable power supply and thus the heating produced by said induction heating coil to heat the painted metal strap to a predetermined temperature at said temperature sensing means, said control circuit including limit means responsive to said metal strap speed sensing means for deenergizing said induction heating coil when the speed of the metal strap with respect to said induction coil is below a predetermined value, whereby to dry the paint on the metal strap throughout the length thereof passing through said induction heating coil.
Claim 7
Dependent Claim
31 words
The system set forth in claim 4, wherein said limit means is operative to deenergize said induction heating coil when the speed of the metal strap is below about 50 feet/min.
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |