When the top sleeve is reversing-rotated, the contact piece leaves the inclining surface, the upright rod is bounced back upwards, and the motor circuit is cut off.

反向转动顶套时，触片离开斜面，竖杆向上弹回，马达电路被断开。

The entire door type scaffold is characterized in that the connecting bar and the upright rod are welded together through a welding hole on the upper end of the upright rod;

它包括立杆、连接棒、安 全销，其特征：通过立杆上端的焊接孔，将连接棒和立杆焊接在一起；

The utility model can be fixed in any position of an upright rod according to different operating requirements. The utility model has the advantages of convenient use, firm fixation, etc.

本实用新型可根据各种不同使用要求在立杆上任何位置加以固定，具有使用方便，固定牢固等优点。