US Patent 9382918 Ceiling fan

A ceiling fan includes a suspension part, a pipe, and a main body, the main body has a coupling part, an upper portion of the coupling part has a coupling hole, a lower portion of the pipe has a pipe hole, the coupling part is inserted into the pipe, a bolt inserted into the coupling hole and the pipe hole, and a nut. The bolt includes a threaded portion and a head having a curved surface that conforms to the shape of the outer surface of the pipe. The curved surface has a head direction guide part that guides the direction of the curved surface such that the curved surface is fixed in contact with the outer surface with the nut.