Retraction mechanism

The invention relates to a retraction mechanism (7) for an electrical contact (9), the retraction mechanism characterized by comprising a drive shaft (20) with an external thread arranged to ratably drive the retraction mechanism, the drive shaft being supported by a frame (6) in a fixed position relative to the frame; a threaded collar (1008) with an internal thread arranged to engage with the outer thread of the drive shaft, the threaded collar being arranged to be moved along the drive shaft by rotation of the drive shaft and means (1000, 1009,1010) to lock the position of the threaded collar with respect to the frame. 本发明涉及用于电触头(9)的伸缩机构(7)，伸缩机构的特征在于包括具有外螺纹的驱动轴杆(20)，其被布置为可旋转地驱动伸缩机构，驱动轴杆由框架(6)支撑在相对于框架的固定位置；具有内螺纹的螺纹领部(1008)，其被布置为与驱动轴杆的外螺纹啮合，螺纹领部被布置为通过驱动轴杆的旋转沿着驱动轴杆移动；以及用于关于框架锁定螺纹领部的位置的部件(1000,1009,1010)。