Control device with optimized coaxiality

A control device (1), including:

• a rotary switch (2) having a body (6) and a control rod (20) which extends along an axis (A), said control rod (20) having a general cylindrical form, and being mounted with at least one degree of rotational freedom in relation to the body (6) along the axis (A), said control rod (20) being provided with at least one diametrical slot (21) which extends in a plane of reference (P) defined by a first diametrical direction (X) and the axis (A), said diametrical slot (21) thus defining the first and second half-parts (20a, 20b) of the rod,
• a molded plastic knob (3) which includes a housing which is adapted to receive said control rod (20), said housing including at least two flexible fingers (31, 32) which are diametrically opposed and resiliently provided in order to press the two half-parts (20a, 20b) of the rod radially inward, and at least two fixed fingers (33, 34) which are diametrically opposed and connected together by means of a connecting wall (35) which extends along the plane (P),
• the connecting wall (35) being received in the diametrical slot (21) without any substantial play in order to immobilize the knob (3) in relation to the control rod (20) in a direction (Y) perpendicular to the plane of reference (P), the two flexible fingers (31, 32) holding the knob (3) along the axis (A) by means of friction or by means of mechanical or spring-assisted blocking,
• wherein the connecting wall (35) has an axial end (21c) which projects beyond the axial end (31c, 32c) of the flexible fingers (31, 32) such that for insertion for assembly, the introduction of the connecting wall (35) into the diametrical slot (21) precedes the positioning of the flexible fingers (31, 32).

A control device (1), comprising:

• a rotary switch (2) having a body (6) and a control rod (20) which extends along an axis (A),
• said control rod (20) being mounted with at least one degree of rotational freedom in relation to the body (6) along the axis (A),
• said control rod (20) being provided with a diametrical slot (21) which extends in a plane of reference (P) defined by a first diametrical direction (X) and the axis (A), said diametrical slot (21) defining the first and second half-parts (20a, 20b) of the rod;
• and
• a molded plastic knob (3) which includes a housing, said control rod (20) being received in the housing,
• said housing including i) two flexible fingers (31, 32) which are diametrically opposed and resilient, inner surfaces of each of the flexible fingers (31, 32) bearing on diametrically opposite outer surfaces of the control rod (20) in order to press the two half-parts (20a, 20b) of the rod radially inward, ii) two fixed fingers (33, 34) which are diametrically opposed, inner surfaces of each of the fixed fingers (33, 34) being arranged along diametrically opposite outer surfaces of the control rod (20), and iii) a connecting wall (35) that extends along the plane (P) and connects the two fixed fingers (33, 34),
• wherein the connecting wall (35) is received in the diametrical slot (21) without any substantial play in order to immobilize the knob (3) in relation to the control rod (20) in a direction (Y) perpendicular to the plane of reference (P), the two flexible fingers (31, 32) holding the knob (3) along the axis (A).