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A system allowing to control an electrically powered wheelchair without using the hands is introduced. HaWCoS -- the "Hands-free" Wheelchair Control System -- relies upon muscle contractions as input signals. The working principle is as follows. The constant stream of EMG signals associated with any arbitrary muscle of the wheelchair driver is monitored and reduced to a stream of contraction events. The reduced stream affects an internal program state which is translated into appropriate commands understood by the wheelchair electronics. The feasibility of the proposed approach is illustrated by a prototypical implementation for a state-of-the-art wheelchair. Operating a HaWCoS-wheelchair requires extremely little effort, which makes the system suitable even for people suffering from very severe physical disabilities.