Patent ID: 8146507

Claim:
A crane rail for suspended crabs comprising: a bottom flange in the form of a hollow chamber that extends a length of the crane rail with a constant cross section and forms travel surfaces for wheels of the suspended crabs on an upper side of the bottom flange; a first web that is aligned vertically upward in a normal operating position and originates from a center of the bottom flange; a top flange in the form of a hollow chamber that extends the length of the crane rail with a constant cross section and is connected to the bottom flange by the first web; a second web that is aligned vertically upward in the normal operating position and originates from a center of the top flange; and a support flange from which the crane rail may be suspended in the form of a hollow chamber that extends the length of the crane rail with a constant cross section that is connected to the top flange by means of the second web; said crane rail being configured in a single piece from a roll-formed sheet steel strip with two continuous longitudinal strip edges, said bottom flange, top flange, and support flange hollow chambers each defining closed chambers without any longitudinal opening from the respective chamber extending the length thereof, said strip edges being fixedly secured by welding to the sheet steel strip along or adjacent the strip edges, and at least two of said closed chamber defining flanges being free of seams defined by said strip edges.