| 摘要 |
<p>In the improved operating mechanism of the instant invention there is associated with the rotatable contactoperating arm an abutment member, such as a plate, for example, which is associated with the contact-pressure spring, and a reverse-current loop arm pivotally mounted to the contactactuating arm has a nose portion bearing on said abutment member or plate, and operable during the de-energized condition of the magnet to act in an opening direction against said abutment plate, and have its fulcrum point at the pivot-shaft location between the contact-actuating arm and the movable contact stem. Thus, magnetic forces are brought into play to redirect the reverse-current loop effect, and to pry, in effect, the welded contacts apart, and thereby assist the opening accelerating springs of the circuit-interrupter or contactor.</p> |
