Patent ID: 8397869

Claim:
A ladder device for a construction machine, the ladder device being of a movable type for climbing up to and climbing down from a walkway mounted on a vehicle body of the construction machine, the ladder device comprising: a ladder main body of a movable type having a first end and a second end, the first end supported pivotably about a first pivot shaft by the vehicle body the ladder main body configured to take either a deployed posture of positioning the second end on a ground side or a retracted posture of directing the second end upwards; at least a hand railing of a movable type disposed on at least either of right and left sides of the ladder main body, the hand railing having a bottom end supported pivotably about a second pivot shaft by the vehicle body; a driving mechanism configured to move the ladder main body between the deployed posture and the retracted posture; and at least a coupling member having a first end and a second end, the first end supported pivotably about a ladder side fulcrum by the ladder main body the second end supported pivotably about a hand railing side fulcrum by the hand railing, the coupling member configured to position the hand railing between the ladder main body and the walkway when the ladder main body takes the deployed posture, the coupling member configured to pivot the hand railing in conjunction with a pivot action of the ladder main body from the deployed posture to the retracted posture, the coupling member configured to position the hand railing further inwards of the vehicle body than the ladder main body is when the ladder main body takes the retracted posture, wherein the walkway is provided with a safety fence, the ladder main body includes: a pair of side plates configured to be extended towards the ground from the walkway when the ladder main body takes the deployed posture; and a pair of banisters respectively supported by the paired side plates, and the hand railing includes: a first part having an engaging portion, the engaging portion configured to be engaged with the safety fence when the ladder main body takes the deployed posture; and a second part disposed adjacent to a corresponding one of the banisters.