PURPOSE: To form a riser with its gap not so spread by forming a circular arc which passes through a riser upper end in the intermediate between a circular arc, provided with a center point of a footstep front wheel serving as the center and a distance to the riser upper end serving as radius, and a circular arc provided with a point in a footstep point end part serving as the center and a distance to the riser upper end serving as the radius.
CONSTITUTION: A surface of a riser 4 is formed so that its sectional shape obtains a circular arc M of radius T with a point E on A to C serving as the center. The circular arc M is positioned in the intermediate between a circular arc L, in which an L distance S of connecting the center, when a footstep is floated, that is the center C of a front wheel to an upper end B of the riser serves as the radius, and a circular arc K of radius R of connecting the conventional A and B, and further the circular arc M is formed by connecting a position D enough for only holding a gap between adjacent footsteps. That is, the circular arc is formed with an almost intermediate point on a line, connecting the point of the above- mentioned footstep point end part to the center point of the front wheel, serving as the center and a distance from this center to the riser upper end part serving as the radius. Consequently, in the case of the footstep floated by force applied to the riser 4 by foreign matter, possibility of further drop in thereof is eliminated by almost not increasing a gap G between the riser 4 and the point end part of the rear adjacent footstep.
JP3292632 | STEP FOR ESCALATOR |
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