| 摘要 |
An automatic locking system for a self-adjustable leveling ladder engages when the ladder is placed on the ground and disengages when the ladder is lifted off the ground. The automatic locking system includes a clamping mechanism, a first support, and a second support. The clamping mechanism includes a first member, a second member, a central pivot, a pair of key plates, and a cross rail. The first support pivotally connects to the first member, and the second support pivotally connects to the second member. The first member hingedly connects to the second member by the central pivot, which allows the key plates to grasp the cross rail if the first support and the second support are pressed against the ground. The first member and the second member are able to slide along the cross rail, which properly adjusts the first support and the second support for an uneven ground surface. |
