Patent ID: 10837229

Abstract:
A ladder with a guardrail is provided. The U-shaped guardrail has a center arm portion and two side arm portions. Each slot is provided through a side arm portion and has an elongated oval shape. Each hinge center bolt is disposed through a slot and engages a side arm portion to a hinge rotatably. The guardrail lock is disposed at the side arm portion, and the guardrail lock comprises first and second locks, a center rivet, a pair of stopper pins, and a torsion spring. The first or second lock has a guiding curve portion, a circular locking portion, and a through-hole. The center rivet is queued through the through-holes and fixes the first and second locks to the side arm portion rotatably and fixed to the side arm portion. The first and second locks receives and is locked to locking pins on top portions of the side rail.