US Patent 7197848 Swing flap for the entry and exit of pets

A swing flap (10) for the entry and exit of pets comprising a frame (11), which can be fixed to an opening (12) made in a door or a wall, equipped at the top with hinged means of constraint for a flap (20), and a first function selector (30), designed to control the opening and closing functions of the swing flap (10), this selector comprising a knob (29) integral with a first pair of elements (31, 32) being shaped in such a way to allow, respectively: the opening of the flap (20) in a first direction;the opening of the flap (20) in a second direction, opposite to the first direction;the opening of the flap (20) in both directions;blocking of the opening of the flap (20).The first selector (30) is kinematically connected to a second selector (36), not equipped with a knob but with a second pair of elements (31′, 32′) which control the opening and closing of the flap (20) depending on how the knob (29) is turned.