Magnetic chuck demagnetizer

Claim 1

APPARATUS FOR DEMAGNETIZING AN ELECTROMAGNETIC COMPRISING A SOURCE OF ALTERNATING CURRENT INCLUDING FIRST CIRCUIT MEANS, RECTIFYING MEANS FOR CONVERTING THE ALTERNATING CURRENT TO DIRECT CURRENT, CIRCUIT MEANS FOR TRANSMITTING THE DIRECT CURRENT TO THE ELECTROMAGNETIC, CYCLING MEANS OPERABLE THROUGH A PREDETERMINED CYCLE, MEANS CONTROLLED BY SAID CYCLING MEANS AND OPERABLE AT A PREDETERMINED NUMBER OF INTERVALS IN A CYCLE OF OPERATION FOR INTERRUPTING SAID FIRST CIRCUIT MEANS AND THUS THE ALTERNATING CURRENT AT FULL VOLTAGE VALUE OF THE ALTERNATING CURRENT AND REESTABLISHING IT, AND MAINTAINING THE ALTERNATING CURRENT SO ESTABLISHED FOR SUCH PERIOD OF TIME AND AT SUCH VALUE OF VOLTAGE AT THE RESPECTIVE ONES OF SAID INTERVALS THAT THE MAGNETIZATION IMPOSED ON THE ELECTROMAGNET IS PROGRESSIVELY DECREASED IN SUCCESSIVE ONES OF SAID INTERVALS, AND MEANS OPERABLE DURING EACH INTERRUPTION FOR REVERSING THE POLARITY OF THE DIRECT CURRENT TRANSMITTED TO THE ELECTROMAGNET, SAID CONTROLLED MEANS MAINTAINING THE ALTERNATING CURRENT FOR TIME PERIODS OF SUCCESSIVELY REDUCED DURATION BETWEEN SUCCESSIVE INTERRUPTIONS OF SAID FIRST CIRCUIT MEANS IN A CYCLE OF OPERATION.