The contribution of the project by this novel design of staircase is to save about 90% of the space which is required by a conventional spiral staircase. This novel design could be used in space critical applications particularly in urban areas.
This design enables to retract all steps into one side. Shape of a step should be triangular or a sector of a circle. Each step should be fixed to a hollow cylinder which goes around the main pole. When two adjacent steps are considered, one should be fixed as it could be rotated on top of the other on a horizontal plane around a vertical axis.
The pin affixed to the lower edge of the next step goes through the upper groove of the hollow cylinder and when one cylinder moves, the other one follows it by the internal connecting system.