Self-adjusting switch mechanism with anti-adjustment protection

A switch mountable in a feeding aperture in a support plate, the switch comprising an elongated housing having a base;

• a retention device for fixing the switch to the support plate;
• a switch plunger extending along a longitudinal axis of said housing and movable longitudinally against a spring action;
• a slider movable relative to said switch plunger and surrounding said switch plunger over a part of its length;
• means for guiding said slider and including radial vanes provided on said slider and guide grooves provided in said housing so that said radial vanes of said slider are guided in said guide grooves of said housing parallel to said longitudinal axis so as to move longitudinally up to opposite wall sections of said housing;
• limit stops arranged along side said guide grooves in staggered formation in a circumferential direction of said housing so that said slider is fixable in an axial direction between said limit stops;
• notched tracks having rows of locking teeth extending parallel to said longitudinal axis and provided on a shank of said plunger and inside said slider, which intermesh like a comb and fix said switch plunger to said slider in an axial direction when said switch plunger is turned with respect to said slider, said switch plunger together with said housing being rotatable about said longitudinal axis with respect to said slider until a mutual engagement of said notched tracks takes place, and on further rotation of said switch plunger with respect to said slider around said longitudinal axis after engagement of said notch tracks, said slider is released from engagement with said limit stops on said housing and said base, and thus after adjustment of the length of said plunger, said slider is guided longitudinally together with said switch plunger in said guide grooves of said housing.