| 摘要 |
<p>An electrical switch, e.g. a butterfly-type switch, includes a movable actuator (4) mounted in a housing (1) and biased by a compression spring. Two contact arms (6) pivotally engage notches (9) in the actuator (4) and are urged together by a tension sprint (8). A fulcrum (20) is provided for each contact arm so that during closing movement of the actuator (4) in the direction of the arrow the contact arms pivot about the fulcrum (20). When the horizontal position of the arms (6) is reached they pivot rapidly upwardly to interconnect fixed contacts (2). During the return movement the contact arms (6) pivot about the point of contact between contacts (2) and contacts (7). This arrangement allows an increased contact gap in the open condition for the same amount of movement of the actuator (4).</p> |
