Electromagnetic blocking device for the door of an electric household appliance, in particular the door of a washing machine

A blocking device for a door of an electric household appliance having a door or viewing panel, comprising:

• a plate sliding on a support securable to a side of said door and configured to be engaged by a striker of the door;
• a safety device comprising a pawl and electrically actuated control means for selectively moving the pawl between a first and a second position, wherein the pawl respectively engages or does not engage the plate to block or not block the plate engaged with the striker;
• wherein the control means comprises an electromagnet having a winding and a core which is mobile along an axis of the winding;
• wherein the core is operatively associated to a slide which is moveable parallel to the axis of the winding between a first and a second limit stop position, only in the first limit stop position, a protrusion of the slide cooperates with the pawl to block the pawl in the first position;
• the control means further comprising a push-push retaining device operatively associated on one side to the slide and on the opposite side to a pre-loaded spring sandwiched between the retaining device and a contrast shoulder fixed to the support;
• wherein the push-push retaining device comprises an accommodating bushing integrally secured to the support and having a through seat defined by a first and a second hole having different diameters and a shared axis parallel to the axis of winding;
• the push-push retaining device being configured so as to be adapted to block the slide in the first limit stop position following a single energizing pulse of the electromagnet and to release the slide, so as to allow the spring to take it to the second limit stop position, following two consecutive energizing pulses of the electromagnet.