Retractable control device for domestic appliance

A retractable control device for a household electrical appliance, comprising:

• a body secured to a control interface of the appliance, the body including an end wall and a cylindrical side wall that define a chamber,
• a control member positioned in the chamber of the body, the control member including a first element secured to the end wall of the body and a second element moveable relative to the first element,
• a knob coupled to the second element of the control member and moveable relative to the body, and
• a centering frame including a shell extending outwardly from an open end of the chamber of the body, the shell including (i) an opening, (ii) a cylindrical inner wall extending inwardly from the opening to a lower inner wall to define an aperture in the shell, and (iii) a hollow shaft extending from the lower inner wall,
• wherein (i) the hollow shaft of the centering frame extends over the second element of the control member, (ii) an annular passageway is defined between the hollow shaft and the cylindrical inner wall of the centering frame, and (iii) the knob includes a cylindrical outer wall that is positioned in the annular passageway;
• and
• wherein the retractable control device comprises:
• the control member cooperating with a body of substantially circular-based frusto-conical cup shape with an end portion provided with a hole for passage of an end of the member to secure the control member to the knob, the body presenting a plurality of radially distributed elastically movable projections having their free ends lying on a circumference of diameter exceeding that of the cylindrical inner wall, the body rigid with the control member being internal to said centering frame and having a plurality of projections in contact with the perimetral wall of the centering frame, the contact centering the knob within the aperture and blocking oscillation about the axis of movement of the knob;
• at that end inserted into the aperture, the knob presenting a plurality of radially disposed lugs with their end laying on a circumference having a diameter greater than that of cylindrical outer wall, said lugs being elastically deformable and bearing on the cylindrical outer wall such as to center the knob on the longitudinal axis of the aperture and block any oscillation about that axis.