| 摘要 |
<p>A first lever (5b) cooperates with a second lever (8b) to permit the closure of a supply contact (25) only when the first lever (5b) extends in a closing direction (D). Means (not shown) urge the first lever (5b) into three positions of stable equilibrium, a central one and two lateral ones. A disc (7) driven by the means for driving the programming cams (1, 2) comprises pins (70) for driving the first lever (5b) to drive it into its lateral positions. One cam (9) is provided with bosses to push back the second lever (8b) and to open the contact (25) just before the driving of the first lever (5b) which then prevents the closure of the contact (25) during the displacement of the programming cams (1, 2). At the end of the displacement, a brief return in the opposite direction of the disc (7) causes the first lever (5b) to flip over into the central position, to permit the closure of the contact (25). The invention is especially applied in the field of domestic electrical equipment.</p> |
