The present invention relates to a seat lifter, and more particularly to a seat lifter for mounting the seat of a bus in, when the horizontal frame and formed on, coupled to the horizontal frame, a body portion and a guide frame which is composed of the vertical frame and vertically formed in the vertical frame and the vertical frame is formed parallel to the upper both sides, the the body portion and the guide portion is coupled with a number plate on the upper side, and a rotary part formed on one side of the body portion, and coupled to the elevation rotary part, the seating having a seat plate which is formed in the guide section and the same height at the rise jidoe comprises a drive unit and for operating the rotary part, the rotary part is rotatably coupled to the rotation axis between the vertical frame, one end is coupled to the rotating shaft, the other end is hinged to the lifting arm receiving portions and, one end is formed to be rotatable in the lower portion of the rotary shaft, the other end by a base that is fixed to the seating technical lower portion consisting of a horizontal support arm that allows to maintain the elevated seating portion in horizontal, the chair seat part Since thereby elevating the position will be able to move the chair of the bus to the point where you want the chair through the window at the time of assembly of the seat lifter for buses that require less manpower. ;
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