Scanning type induction heating

Claim 2

In a scanning type induction heater, a multiturn solenoid type induction coil having an entrance end and an exit end and adapted to continuously progressively heat an elongated load projecting through said coil whereby the highest load temperature is attained adjacent to said exit end, the load and coil traveling axially with respect to each other during heating; means for energizing said coil to heat the load to quenching temperature, said energizing means including means to apply relatively increased voltage to that portion of said coil adjacent to said exit end wherefore every portion of the moving load attains a uniform maximum temperature proximate to said exit end.

Claim 3

In a scanning type induction heater as set forth in claim 1: means modifying the power distribution including means electrically dividing the portion of said coil adjacent to said exit end into at least two adjacent zones whereby to increase the voltage in steps toward the exit end of said induction coil.

Claim 4

In a scanning type induction heater as set forth in claim 1: said means for energizing said coil comprising power leads connected to the ends of said induction coil; an autotransformer connected in parallel with said induction coil; and tap means adjustably connecting an exit end portion of said induction coil with said autotransformer whereby the voltage in the tapped portion of said coil is increased relative to the untapped portion thereof to attain maximum temperature in the load proximate to said exit end.

Claim 5

In a scanning type induction heater as set forth in claim 3: said tap means being located at said autotransformer for adjustment with respect thereto.

Claim 6

In a scanning type induction heater as set forth in claim 3: said tap means being located at said induction coil for adjustment with respect thereto.

Claim 7

In a scanning type induction heater as set forth in claim 1: said means for energizing said coil comprising power leads connected to the ends of said induction coil; a pair of autotransformers connected in parallel with said induction coil; and a pair of adjustable tap means connecting an exit end portion of said induction coil with respective of said autotransformers whereby said exit end portion is divided into two zones of control for increasing the voltage in said zones relative to the untapped portion of said coil in steps toward said exit end whereby the spot at which the load attains maximum temperature is proximate to said exit end of said coil.

Claim 8

In a scanning type induction heater as set forth in claim 1: said means for energizing said coil comprising power leads connected to the ends of said induction coil; an autotransformer connected in parallel with said induction coil; a pair of tap means adjustably connecting an exit end portion of said coil at two axially spaced points along said coil and autotransformer whereby said exit end portion is divided into two zones of control for increasing the voltage of said exit end portion relative to the untapped portion of said coil in steps toward said exit end whereby the spot at which the load attains maximum temperature is proximate to said exit end of said coil.

Claim 9

In a scanning type induCtion heater as set forth in claim 1: said means for energizing said coil comprising a main transformer having primary and secondary windings; a pair of power leads connected adjacent to the ends of said primary winding, one of said leads being adjustably connected to said primary winding by tap means; means connecting the ends of said secondary winding to said induction coil; and an additional pair of tap means adjustably connecting an exit end portion of said coil at two axially spaced points along said coil and secondary winding whereby said exit end portion is divided into two zones of control for increasing the voltage relative to the untapped portion of said coil in steps toward said exit end whereby the spot at which the load attains maximum temperature is proximate to said exit end of said coil.

Claim 10

In a scanning type induction heater as set forth in claim 1: said means for energizing said coil comprising a main transformer having primary and secondary windings; a pair of power leads connected adjacent to the ends of said primary winding, one of said leads being adjustably connected to said primary winding by tap means; means connecting the ends of said secondary winding to said induction coil; and tap means adjustably connecting an exit end portion of said induction coil with said secondary winding whereby the voltage in the tapped portion of said coil is increased relative to the untapped portion thereof and whereby the spot at which the load attains maximum temperature is proximate to said exit end of said coil.

Claim 11

In a scanning type induction heater, a multiturn solenoid type induction coil having an entrance end and an exit end and adapted to continuously progressively heat an elongated load projecting through and having relative axial movement with respect to said coil and bringing every portion of said load to its highest temperature adjacent to said exit end; means for energizing said coil including power leads connected to the ends of said induction coil; transformer means connected across said power leads in parallel with said induction coil; tap means connected between said transformer means and induction coil whereby said induction coil is divided axially into a tapped section adjacent to said exit end and an untapped section extending form said entrance end to said tapped section; said tap means providing an increased voltage level in said tapped section relative to said untapped section and shifting the distribution of power generated in the load toward the exit end of said induction coil whereby the temperature of every portion of the moving load reaches its highest level adjacent to said exit end.

Claim 12

In a scanning type induction heater, a multiturn solenoid type induction coil having an entrance end and an exit end and adapted to continuously progressively heat an elongated load projecting through and having relative axial movement with respect to said coil and bringing every portion of said load to its highest temperature adjacent to said exit end; means for energizing said coil including power leads connected to the ends of said induction coil; transformer means connected across said power leads in parallel with said induction coil; tap means connected between said transformer means and induction coil whereby said induction coil is divided axially into a tapped section adjacent to said exit end and an untapped section extending form said entrance end to said tapped section; said tap means providing an increased voltage level in said tapped section relative to said untapped section and shifting the distribution of power generated in the load toward the exit end of said induction coil whereby the temperature of every portion of the moving load reaches its highest level adjacent to said exit end.

Claim 13

In a scanning type induction heater as set forth in claim 10: said transformer means comprising an autotransformer connected in parallel with said induction coil.

Claim 14

In a scanning type induction heater as set forth in claim 11: said tap means being adjustably connected at said autotransformer for adjusting the voltage level in said sections of said coil.

Claim 15

In a scanning type induction heater as set forth in claim 11: said tap means being adjustably located at said induction coil for adjusting the voltage level in said sections thereof.

Claim 16

In a scanning type induction heater as set forth in claim 10: said untapped section being of greater axial extent than said tapped section.

Claim 17

In a scanning type induction heater as set forth in claim 10: said transformer means comprising a pair of autotransformers each connected in parallel with said induction coil; said tap means comprising a pair of adjustable taps connecting an exit end portion of said coil with respective of said autotransformers whereby said tapped section is divided into two zones of control for increasing the voltage in said zones relative to said untapped section in steps toward said exit end.

Claim 18

In a scanning type induction heater as set forth in claim 10: said transformer means comprising an autotransformer; said tap means comprising a pair of adjustable taps connectinG an exit end portion of said coil at two axially spaced points along said coil and autotransformer whereby said exit end portion is divided into two zones of control for increasing the voltage in said zones relative to said untapped section in steps toward said exit end.

Claim 19

In a scanning type induction heater as set forth in claim 10: said transformer means comprising a main transformer having primary and secondary windings; said power leads comprising incoming lead portions connected adjacent to the ends of said primary winding, one of said incoming lead portions being adjustably connected to said primary winding; said power leads including connector lead portions connecting the ends of said secondary winding to the ends of said induction coil; said tap means being adjustable at said coil whereby voltage in the tapped portion of said coil is increased relative to the untapped portion thereof.