Abstract: A locking device for a door. The device includes at least one locking element movably mounted on the door. The door is locked by extending each locking element along one diagonal line of the door until the outer edge of the element enters into a recess in adjacent sides of the door frame. The door is unlocked by retracting each locking element along the diagonal line to the point where the outer edge of the element has exited from the recess and the inner edge is resting on the other diagonal line of the door.

Abstract: The method for jointing frames, small pieces of furniture, drawers, with corner parts, is characterized by the successive operations: simultaneously cutting the sides of the frame to the desired dimensions; machining the halving of each corner part in a single operation into two adjacent elements of the frame to be assembled and simultaneously in the four corners; gluing the corner parts and their housing hollowed out in the elements to be assembled; the premounting of corner parts in their housings; the assembly and tightening of the frame thus formed. The corner parts used are flat with one or two ogival ends and/or one straight end and/or one whistle-shaped end forming a 90.degree. angle, and/or one bevelled end and/or one rounded end, and/or one circular end.