Quick-coupling wing type hinge and base

In a hinge for furniture doors having a cup (12) which is disposed to be flush-mounted in a recess (18) formed in the surface of a door (17), close to one edge thereof, the cup (12) being secured, by means of articulated arms (62), to a wing (11) connecting it to a base (34) secured to a piece of furniture, the cup (12) having thereon lateral protrusions (13, 14) which overlie said surface of the door and which are provided with slots (15, 16) each having an enlarged first portion for permitting insertion of the head (21, 22) of a pin element (19, 20) and a second, narrower portion for receiving a reduced diameter shank portion of a pin element (19, 20) the head (21, 22) of each of said elements (19, 20) being larger in diameter than the width of said second portion of a respective slot, the head (21, 22) of each of said elements being secured to and spaced from the surface of the door (17) on either side of said recess (18) in the door, the cup (12) being coaxially rotatable in the recess (18) from a released position in which it fits into the recess (18) with the heads (21, 22) of the elements registering with the enlarged portions of the slots (15, 16), to an operative or locked position with the wing (11) disposed generally perpendicular to the edge of the door (17), and with the narrower portions of the slots (15, 16) receiving therein the reduced diameter shank portion of the respective pin element (19, 20), and wherein the improvement comprises a cover (65) secured over said cup and said lateral protrusions and having engaging means for engaging the cover to the cup (12), the cover (65) having thereon interfering means positioned to interfere with at least one pin element of said elements (19, 20) for preventing rotation of the cup (12) from its operative position to its released position.