1. The flared staircase column lock, hear the "click" sound at the same time locking block enter the location, this position has been expressed hinge lock.
2. Pulling the handle to unlock the lock to open, while locking block retreat position, showing the hinge is unlocked at this time can change the angle or folding ladder column situation ladder pull handle does not move when encountered, not be unlocked, which is due to the hinge by forces of oppression live locking block, then you can pull the ladder column shaken to release the external force
3. After checking into the use of state development ladder, carefully verify that all hinges are in the locked position before use, if the block is in the hinge lock position, it can be symmetrical hinge open, then inward folding ladder column of about 40 degrees, and then flared to make the right hinge locking
a. Full-length less than or equal to 4 m can be expanded into a straight ladder ladder, in which case the angle between the ladder and the ground should be greater than 75 degrees, the middle of the ladder hinge should face the wall
b. Sizhe ladder was used as a platform, be sure to pad thickness of at least 1cm Tablet
c. When someone on the job ladder, pulling the handle to change others is strictly prohibited hinges ladder lock status of the sea