Multifunctional ladder assembly

The utility model discloses a multi-functional ladder bed, including first ladder section, second ladder section, third ladder section, hinge locking device, hinge locking device is provided with second ladder section both ends, hinge joint with first ladder section and third ladder section respectively, hinge locking device provides the revolute pair, hinge locking device includes inner hinge arm, outer hinge arm, outer disc lock catch hand, central pin roll, and hinge locking device is provided with the inner hinge arm, outer hinge arm, outer disc lock catch hand, central pin roll. The outer hinge arm is fixedly connected with the second ladder section, the inner hinge arm is fixedly connected with the first ladder section and the third ladder section respectively, two parallel outer discs are oppositely arranged on the outer hinge arm, pin shaft sleeves are arranged on the two outer discs respectively, the outer discs and the pin shaft sleeves are coaxially arranged, the outer disc lock catch hand is rotat