LIFTING UP AND DOWN DEVICE OF WORKING IMPLEMENT

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PROBLEM TO BE SOLVED : To provide a lifting up and down device of a working implement capable of lifting up and down its working part by making the working part in a floated state in the case of working or moving on the surface of the ground having unevenness such as a sloping ground, along a ground surface. SOLUTION : This working implement equipped with a lift cylinder supporting the working part freely up and down movably and lifting up and down is provided by using a singly moving cylinder as the lift cylinder, making the inside of the singly moving cylinder in a half vacuum state by an outside force on receiving the force for lifting up the working part in upward direction (an elongating direction of the singly moving cylinder) from the outside, elongating or contracting the singly moving cylinder and making it in a floating state during a period of becoming the half vacuum state, and working or moving while following the ground surface having the unevenness as guided by a front wheel, sleigh, side plate of a cover of the working part, or the like, which is an earth-contacting body for setting a height from the ground of the working part.