Induction type electrical wire preheater

A preheater for heating electrical wire in linear motion comprising:

• a. a mounting plate,
• b. first and second inductors mounted on said mounting plate in side-by-side relationship, each inductor having an insulated passageway through which the electrical wire to be heated is passed, said first inductor being fixedly mounted on said mounting plate with its insulated passageway vertical, said second inductor being pivotally mounted on said mounting plate so that it can be placed in either a first angular position wherein its insulated passageway is vertical or a second angular position wherein its insulated passageway is tilted,
• c. a lower wheel rotatably mounted on said mounting plate below said first and second inductors,
• d. a first upper wheel sized for handling intermediate sized wire and a second upper wheel sized smaller than the first upper wheel for handling small sized wire, the lower wheel being the same size as the first upper wheel, both upper wheels being formed of electrically conductive material, one of said upper wheels being rotatably mounted on said mounting plate, the position of the upper wheel on the mounting plate depending on whether it is the first upper wheel or the second upper wheel and the particular upper wheel mounted on the mounting plate depending on the size of the wire being heated,
• e. an idler wheel mounted on said mounting plate when said second upper wheel is mounted on mounting plate, and
• f. power supply means coupled to said first and second inductors for applying current thereto.

An electrical wire preheater for preheating electrical wire to be fed into an extruding die comprising:

• a. a base
• b. a frame fixedly mounted on said base,
• c. a mounting plate pivotally mounted on said frame,
• d. a pair of inductors each pivotally mounted on said mounting plate in spaced side by side relationship,
• e. a lower wheel rotatably mounted on said mounting plate below said inductor,
• f. an upper wheel rotatably mounted on said mounting plate above said inductor in vertical alignment with said lower grooved wheel, and
• g. a power source coupled to said inductors.

An induction wire preheater for heating electrical wire comprising:

• a. mounting means,
• b. a first inductor mounted on said mounting means,
• c. a second inductor mounted on said mounting means,
• d. each inductor having a longitudinal insulated passageway,
• e. one of said inductors being pivotally mounted on said mounting means,
• f. a first wheel rotatably mounted on said mounting means above said inductors,
• g. a second wheel rotatably mounted on said mounting means below said inductors, and
• h. means for supplying current to the inductors,
• i. said electrical wire being heated entering the preheater, passing around a first one of the wheels, through the passageway in one of the inductors and around the other one of the wheels, through the passageway in the other inductor, again around the first one of the wheels and then exiting the preheater.