Civil Engineering Reference
In-Depth Information
The buttock-popliteal depth should be the 5th percentile. If it is longer, a small operator
will no
t
be able to reach to the back support with his or her back.
A clearance dimension
(D)
is created under the table. Assuming that the table is
height adjustable and can be lowered 10 cm below elbow height, it still needs to
be determined if there is enough space for the thighs.
FIGURE 8.7
Anthropometric
measures used to calculate the
adjustability of seat height and table
height.
4. Find the anthropometric measures that correspond to the workstation measures. The
calculations for the 5th percentile female and the 95th percentile male operator are
shown in Figure 8.7. The anthropometric measures are added starting from the floor
level. Using the popliteal height and adding 4 cm for shoes, the required range of seat-
height adjustability is calculated to be 39.5-52.5 cm. The sitting elbow height for the
5th percentile operator is 18.1 cm and for the 95th percentile operator 29.4 cm. From
the sitting elbow height, deduct the thickness of the product (6 cm). This means that
the distance from the chair seat to the top of the table is 12.1 cm for the 5th percentile
and 23.4 cm for the 95th percentile. Adding these measures to the seat-height
adjustability gives a required table height adjustability of 51.6-75.9 cm (or 52-76 cm).
Bearing in mind the thickness of the table top, we find that for the 5th percentile
there is 8.1 cm of clearance between the chair seat and the table and for the 95th
percentile there is 19.4 cm of clearance. Since the thigh clearance (see Table 8.3)
