Abstract 1,048,081. Induction heating coils. HOOVER Ltd. Aug. 7, 1963 [Aug. 9, 1962], No. 30614/62. Heading H5H. An induction heating coil includes two or more sections covering different areas of the surface and electrically connected in parallel. As shown, a coil 10 comprises an inner section 14 and an outer section 15 each of flat annular form wound spirally, in the same direction, from narrow conducting tape with its width perpendicular to the plane of the coil. The ends 16, 17 of section 14 and the ends 18, 19 of section 15 are brought out and are connected, e.g. 16 to 18 and 17 to 19 or 17 to 18 and 16 to 19, so that the two sections are in parallel. The two sections may be wound spirally in opposite directions (Fig. 2, not shown) and may have approximately equal surface areas.
A COUPLING COIL FOR INDUCING EDDY CURRENTS IN SUR FACES SUCH AS THE BOTTOM WALLS OF POTS OF DIFFERENT SIZES TO HEAT THE POTS, SAID COIL COMPRISING AT LEAST TWO COIL SECTIONS ONE WITHIN THE OTHER TO COVER DIFFERENT AREAS OF THE SURFACE OF THE POT BEING HEATED AND WOUND SPIRALLY IN OPPOSITE DIRECTIONS, MEANS CONNECTING THE INNER END OF THE INNER COIL SECTION AND THE OUTER END OF THE OUTER COIL SECTION TO ONE TERMINAL OF THE SOURCE OF CURRENT, AND MEANS CONNECTING THE OUTER END OF THE INNER COIL SECTION AND THE INNER END OF THE OUTER COIL SECTION TO THE OTHER TERMINAL OF THE SOURCE OF CURRENT, WHEREBY SAID COIL SECTIONS ARE CONNECTED IN PARALLEL TO A SOURCE OF CURRENT.
Claim 2
Dependent Claim
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A COUPLING COIL FOR INDUCING EDDY CURRENTS IN SUR FACES SUCH AS THE BOTTOM WALLS OF POTS OF DIFFERENT SIZES TO HEAT THE POTS, SAID COIL COMPRISING AT LEAST TWO COIL SECTIONS ONE WITHIN THE OTHER TO COVER DIFFERENT AREAS OF THE SURFACE OF THE POT BEING HEATED AND WOUND SPIRALLY IN OPPOSITE DIRECTIONS, MEANS CONNECTING THE INNER END OF THE INNER COIL SECTION AND THE OUTER END OF THE OUTER COIL SECTION TO ONE TERMINAL OF THE SOURCE OF CURRENT, AND MEANS CONNECTING THE OUTER END OF THE INNER COIL SECTION AND THE INNER END OF THE OUTER COIL SECTION TO THE OTHER TERMINAL OF THE SOURCE OF CURRENT, WHEREBY SAID COIL SECTIONS ARE CONNECTED IN PARALLEL TO A SOURCE OF CURRENT.