| 摘要 |
Switch (10; 20) for actuating an electric motor of a windscreen wiper from a voltage source, which has a switching element that can be set to several continuous-operation modes (D1, D2) as well as to an intermittent-operation mode (I). The switching element has two bridge contacts, the first of which co-operates with fixed contacts (53, 53e, 53a, 53b; 53, 53e, 53a) on a first contact path (A; C), and the second with fixed contacts (I; 53a; 53; I, 53a, 53, 53b) on a second contact path (B; D). In this way, in at least one switching position an additional operating mode (T, D1; D1) of the wiper system can be switched via the second bridge contact and the fixed contacts (53, 53a) of the corresponding second contact path (B; D), in addition to the intermittent-operation mode (I). The switch (10; 20) has, in this way, operational reliability, since there is little danger that a fixed contact (53, 53a) allocated to the same operating mode will simultaneously fail on both contact paths (A, B; C, D) (Fig. 7). |
