Fitting Low Profile and Surface Rails - Important notice
Fit and use
1.
The minimum acceptable length of rail that can safely be installed in a vehicle to accommodate a
wheelchair is 1300 mm. This will allow one wheelchair positioned centrally. The rail must be fitted
ensuring fasteners are fitted to the extreme end hole positions.
2. For details of the space required within a vehicle for a wheelchair installation, reference should be made
to the guidelines within the British or International standard ISO 10542-1 part 2, ”Technical systems and
aids for disabled or handicapped persons - Wheelchair Tiedown and Occupant Restraint Systems”.
Some vehicle layouts may have problems using Low Profile and Surface rail with pre-drilled countersunk
holes due to under floor obstructions, such as box sections or angle brackets. In these situations where
a hole is “missed”, it is required to generate two new holes, one on either side of the original, with the
maximum distance between them being 101 mm.
3. If the distance of the box section is greater than 101mm, we recommend drilling through the box section
and adding a crush spacer to accommodate the new hole.
4.
The original unused hole must finally be filled with a short self-tapping screw with a matching head.
5.
It is critical that the installed rail is flat along its length and correctly positioned relative to any other rail
lengths fitted in the vehicle floor. Elements within a pattern of rails must also be parallel to one another.
This is particularly important if fitting Unwin “Fixed Base Equipment” or manufacturing removable seats,
to ensure they will fit universally along the rails.
6. We recommend that installers use a rail jig to ensure that paired rails are parallel with each other within
acceptable tolerances. Our seat fixtures, when correctly fitted to the seat legs, will accept a rail fitting
tolerance of +/- 1mm on nominal set leg centres. Rail centre to centre variations outside this tolerance
and may lead to seats jamming or to seats not being able to be fitted easily in the rail at difference
positions.
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