Ergonomics - Atlas Copco
Ergonomics - Atlas Copco
Ergonomics - Atlas Copco
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EXTERNAL LOAD<br />
For evaluation purposes, it is assumed that<br />
the tool is being used in a cleaning opera-<br />
tion. The chipping hammer is mainly used<br />
on horizontal surfaces and the height of the<br />
casting can be adjusted to allow a comfort-<br />
able posture for the vertical push down force.<br />
The tool is used by a male operator. It<br />
has a thumb trigger on the back of the han-<br />
dle that can be operated by the thumb or<br />
by the base of the thumb in the palm of the<br />
hand. In the latter case, the trigger force is<br />
part of the feed force. The force required to<br />
operate the trigger of this machine is 15 N.<br />
The minimum feed force required for<br />
this machine is a reaction to the force<br />
resulting from the average air pressure act-<br />
ing on the chisel neck (otherwise the chisel<br />
would leave the machine).<br />
The average air pressure is about 60%<br />
of the inlet pressure, generally 6.3 bar. This<br />
force is 50 N. The maximum feed force is being<br />
Table 4.6 Evaluation of external load for the Chipping Hammer RRF 31.<br />
applied when the spring for vibration control is<br />
bottoming, 80 N. In other words, the machine<br />
operates with low feed forces (