Closure system

A closure system having a fixed closure frame and a moveable closure unit, wherein

• the fixed closure frame comprises a first vertical frame element having a first closure-facing surface with one or more first recesses defined in said first closure-facing surface, and an opposite, second vertical frame element, having a second closure-facing surface with one or more second recesses defined in the second closure-facing surface,
• the movable closure unit comprises first and second opposite vertical edges facing the first and second frame elements, respectively, and movable between a closed position, an intermediate position and an open position, the closure having
• one or more first frame-engaging members defined in said first vertical edge, and configured to be received into the one or more of the first recesses, such that when the closure is in the closed position the one or more first frame-engaging members are fully received therein, and
• one or more second frame-engaging members defined in said second vertical edge, and configured to be received into the one or more second recesses, and when the closure is in the intermediate position, the one or more second frame-engaging members are at least partially received within said one or more second recesses, while the one or more first frame-engaging members are outside said one or more first recesses;
• the closure unit being connected to the second frame element by one or more hinging devices configured for (i) linear displacement of the closure unit along a linear path and in a span between the two opposite frame elements, between the closed position and the intermediate position, and (ii) a pivotal movement of the closure unit between the intermediate position and the open position about a pivot axis defined by the hinging device;
• the one or more second frame-engaging members and the one or more second recesses being shaped and/or dimensioned to permit rotation of the closure from the intermediate position to the open position;
• the hinging device comprising
• a housing attached to one of the second frame element and said second vertical edge holding a rotatable element, rotatable between a first angular state and a second angular state, and
• a plunger having a proximal end coupled to the rotatable element and a distal end coupled to the second vertical edge of the closure unit, the plunger reciprocating in a plunger axis between an extended state and a retracted state, defining a plunger stroke therebetween, the plunger stroke having a length that is the same as or larger than said span between the two opposite frame elements,
• in the first angular state of the rotatable element, the plunger axis is parallel to said path permitting the linear displacement of the closure unit between the closed and intermediate positions while the rotatable element is blocked from rotation, said pivotal movement into the second angular state being enabled once the plunger is at its retracted state, and
• one or more protrusion within the one or more first recesses configured to be received within one or more corresponding sockets within said first frame-engaging members.