(57) A rotary control knob with a first protruding work position and a second retracted
rest position has no need that the support panel on which it is mounted, especially
a dish-washing machine door, has a thickness such as required to allow housing a two-steps
operated restraint device. The control knob is integral with an axially slidable control
shaft, which does not rotate with respect to the rotating portion of the machine component
to be controlled. The same shaft is connected at a point situated backward of the
control knob, to the two-steps operated device which in a first embodiment is housed
in a hollow part of the rotating portion of the machine component to be controlled
and, according to a second embodiment, is linked to the rear end of the control shaft
passing through the said component.
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