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The rail
2
The rail
The rail is a round steel tube bent to shape to which a tooth rack is welded. Bogie rollers in the drive unit ensure that
the drive unit moves evenly along the round tube. A gear in the drive unit engages in the teeth of the tooth rack. This
provides the drive for the stairlift in the tooth rack on the rail.
2.1
Construction
The rail is made of a round steel tube with a diameter of 80 mm and is bended to follow the curvature of the
staircase. A rack is welded under the rail along which the stairlift moves. The chair is pulled along the rack with a
motorized pinion with teeth that fits in the holes of the rack (Figure 2-1).
Figure 2-1: Rail & Pinion
The motor/pinion combination generates the forces needed to move the chair along the transport rail.
The rail is mounted with several brackets on the staircase steps. It is possible to design the rail and chair system for
operation on the left or right side of the staircase. The shape of the bended transport rail is determined by the
drawing office. This office uses the results of the stairwell measurement. This measurement can be done manually
of with an optical measuring method (Figure 2-2) where markers are placed on critical points on the staircase.
Figure 2-2: Optically measuring the staircase dimensions using photographic markers.
Because the standard production length of the steel tubes is limited, depending on the total length a rail is
constructed from a maximum of 3 sections (2 joints) per storey.
The maximum inclination of the rail is 70º.
8
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