Electric heating – Metal heating – By arc
Patent
1998-11-20
2000-10-03
Shaw, Clifford C.
Electric heating
Metal heating
By arc
219132, 361165, B23K 910
Patent
active
061276502
ABSTRACT:
A welder has an electromagnetic switch for turning on and off the power to be supplied to the welder, a control circuit for controlling the turn on and off of this switch according to a starter signal that starts the welder and self-holding circuit for self-holding the switch. This self-holding circuit releases the switch from the self-holding when a voltage of the control circuit lowers to not more than a turn-on voltage of the switch. Therefore, when an applied voltage decreases too low to maintain the turn-on status, the switch is released from its self-holding. A voltage can thus never be applied again to the control circuit unless the starter signal is once turned off. As a result, a coil of the switch is completely free from being burnt out. Also current can be cut off when a temperature of the coil of the switch rises to not less than a given value. Therefore, if an abnormal temperature of the coil is sensed, the coil current is cut off. As a result, the coil of the switch is completely free from being burnt out.
REFERENCES:
patent: 2617913 (1952-11-01), Oestreicher
patent: 2786160 (1957-03-01), Bichsel
patent: 3391333 (1968-07-01), Steinert et al.
patent: 5128826 (1992-07-01), Yoneshige
Naruto Masafumi
Okubo Masayuki
Yasuhara Yoshimichi
Matsushita Electric - Industrial Co., Ltd.
Shaw Clifford C.
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