Ladders in the family life and some construction sites see much, so in use with special attention to user safety and storage after use, etc., the following brief introduction of a few points to note:
1. A total length of less than or equal to 4 meters ladder can be expanded into a ladder to use, this time the angle between the ladder and the ground should be greater than 75 degrees, the hinge in the middle of the ladder should be facing the wall;
2. When the four-fold ladder is used as a platform, be sure to pad a plate thickness of at least 1cm;
3. When someone is working on a ladder, it is forbidden for others to pull the handle to change the locked state of the hinge.