Actuating knob, particularly for window cranks of automotive vehicles

In an automotive vehicle having a window crank, said window crank having a breakaway actuating knob, said knob comprising:

• an outer knob part for serving as a grip;
• an inner knob part surrounded by the outer knob part;
• the inner knob part serving as a pivot pin and the outer knob part having a recess therein in which the pivot pin is received;
• the pivot pin being insertable into an opening of said window crank;
• the pivot pin including detent pins and the detent pins including outward projections thereon for clip mounting of the pivot pin on a connection part defined in the opening of the window crank on which the actuating knob is used;
• a blocking member being installed between the detent pins for holding the detent pins apart and for urging the outward projections to the connecting part for preventing separation of the outward projections from the connecting part;
• the pivot pin having a breakaway section defined along the pivot pin by a stepped borehole within said pivot pin;
• said outward projections including a flange extending outwardly from said pivot pin at the location of said step in said borehole;
• said connecting part comprising a support in said opening of said crank having a surface receiving and positioning said flange;
• any bending movement on said pivot pin being transmitted to the said meetng surfaces of said flanges and said support and thereby being concentrated at said step in said borehole to cause any break which occurs to occur at the location of said step in said borehole.