| 摘要 |
A reset mechanism for a rotary switch, which is manually switchable from a rest position into any desired switch position, for resetting the switch in response to a drop of the electric power supply grid voltage below a predetermined minimum voltage, which includes an electromagnet with an armature, a switching drive shaft including a hand grip section for manually turning the drive shaft into any desired switch position, and a further section having a pinion, shaft sections being freely rotatable relative to each other. A reset device is displaceable transversely to the shaft axis, the reset device including a rack arranged to mesh with the drive shaft pinion and biased by a return spring. A blocking ram is resiliently supported on the armature for displacement in the direction of the shaft axis. An entrainment element is actuatable by the hand grip shaft section, and a transmission member is arranged on the entrainment element between the reset device and the blocking ram and is movable essentially in the direction of the shaft axis. When the grid voltage is above the predetermined minimum to attract the armature, the blocking ram is coupled to the reset device but when the voltage drops below the minimum and the armature is released, the reset device is automatically released for resetting the switch.
|
