| 摘要 |
A stepladder has a front frame, a rear frame, a bracket and multiple steps. The front frame has two front side rails and multiple rungs mounted between the front side rails. The rear frame is connected pivotally to the front frame and has two rear side rails, a crossbeam and a lock. The lock is mounted pivotally on the crossbeam. The bracket is connected pivotally and slidably to the rear frame and has multiple pivot pins. The steps are mounted pivotally on the bracket and are selectively and engaged respectively with the rungs of the front frame. The lock selectively hooks a pivot pin to stably lock the bracket for improved safety.
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