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14
A
MB3150-GB
Figure 23
Moving the castor wheel to a higher or
lower position in the castor wheel fork.
By moving the castor wheel to a higher
position in the castor wheel fork (23A),
the seat is lowered, and by moving the
castor wheel to a lower position, the seat
is raised.
Changing to bigger or smaller castor
wheels
A smaller castor wheel lowers the seat
height, whilst a bigger castor wheel raises
the seat height. By changing the castor
wheel, a smaller castor wheel will give
a smaller turning radius, and thereby
increase the ability to negotiate obstacles
in narrow spaces, and will also give more
room for the legs. A larger castor wheel
will increase the turning radius but will also
improve the ability to negotiate obstacles
on uneven surfaces.
Changing to a longer or shorter castor
wheel fork
A shorter castor wheel fork lowers the
seat height, gives a smaller turning
radius, and thereby increases the ability
to negotiate obstacles in narrow spaces,
and will also give more room for the legs.
A longer castor wheel fork increases the
seat height, and allows several alternative
castor wheels to be used.
The table on page 31 shows which seat
heights can be achieved by using the
methods above.
NB Remember to adjust the angle of the
castor wheel when changing the seat
height, and to adjust the brakes when
changing the seat height at the back.
Castor wheel fork
Castor
wheel
Bearing
housing
Adjusting the chair