~Overhead crane with hook has bridge structure, crane travel mechanism, trolley and electrical devices. This type of crane has work duty of A5 and A6. Can extract supporting device has a hook, grab or electromagnetic sucker (crane magnets), the above extract device may be used alone or simultaneously use two or three.
    There are three kinds of method for entering the platform of cab: from the side, from the end and from the top. Safe slide wire or angle iron can be used for electric conduction of the crane; it can be either at the opposite side of the cab (same as the figure) or at the        same side of the cab.