Foldable and angularly adjustable ladder

Abstract

A foldable and angularly adjustable ladder includes two side supports (1) and multiple stair treads (2). Two ends of each of the stair treads (2) are rotatably connected with the side supports (1), respectively. Each of the side supports (1) includes an upper pole (101) and a lower pole (102) parallel to the upper pole (101). Two foot covers (3) are disposed at a lower end of the side supports (1), respectively. Two upper poles (101) and two lower poles (102) are connected with two end surfaces of the each of the stair treads (2) through four connectors (4), respectively. Each of the connectors (4) is sleeved with a metal ring piece (5), one end of the metal ring piece (5) passes through one of the end surfaces of the each of the stair treads (2) and is located at an inner side of the each of the stair treads.

Dependencies are inferred from the claim text.