WINDING SHAFT STRUCTURE OF SHUTTER

PROBLEM TO BE SOLVED: To provide a winding shaft structure which can reduce a generation sound at the contact of members for constituting a winding shaft, and is used in a shutter to which fireproof performance is required.SOLUTION: A winding shaft structure of a shutter comprises: an internal shaft 30; a winding cylinder which is located outside the internal shaft 30, and arranged so as to be rotatable with respect to the internal shaft 30; a metal-made coil spring 7 which is arranged between an internal peripheral face of the winding cylinder and an external peripheral face of the internal shaft 30, fixed to the winding cylinder at one end, and fixed to the internal shaft at the other end; and an aluminum pipe 8 which is arranged between the external peripheral face of the internal shaft 30 and an internal peripheral face of the metal-made coil spring 7. Grease is applied on an external peripheral face of the aluminum pipe 8.SELECTED DRAWING: Figure 4 【課題】巻取シャフトを構成する部材同士の接触時の発生音を低減することができ、かつ、防火性能が要求されるシャッターに用い得る巻取シャフト構造を提供する。【解決手段】内部シャフト３０と、内部シャフト３０の外側に位置して、内部シャフト３０に対して回転可能に設けられた巻筒と、巻筒の内周面と内部シャフト３０の外周面間に設けられ、一端が巻筒に固定され、他端が内部シャフトに固定された金属製コイルスプリング７と、内部シャフト３０の外周面と金属製コイルスプリング７の内周面との間に設けたアルミパイプ８と、を備え、アルミパイプ８の外周面にはグリスが塗布されている。【選択図】図４