Safety door fastening

A safety door fastening of the type for limiting the angle of opening of a door and comprising on the one hand a rigid retaining member defining a longitudinal space and being pivotably attached to a vertical pin located on the door frame and on the other hand a catch member mounted to the door, comprising an arm having a terminal member adapted to slide in the longitudinal space of the retaining member and hold it, characterized in that the arm of the catch member is adapted for pivoting around a horizontal axis by operation of a lock means operable from the outside of the door, the retaining means having resilient means biasing it against the inner face of the door when the door is in the closed position thereof and said retaining member also having means which, in the closed position of the door, allow the arm of the catch member to be pivoted until its terminal member is disengaged from the longitudinal space of the retaining member, and further characterized in that the catch member arm is fixedly attached to the cylinder of a lock, said cylinder constituting the pivot shaft of the arm.