Abstract: A safety device including first and second members is attached to the pull cords for window coverings to prevent children from strangling when the children play with the pull cords. Detents on first surfaces of the first and second members couple the first and second members in detachable relationship at the first surfaces upon the exertion of forces against the members in directions transverse to such first surfaces. The first member is retained by one of the cords at a position laterally displaced in a first direction from the first surfaces and the second member is retained by the other cord at a position laterally displaced from the first surfaces in a second direction opposite to the first direction. Such retentions are provided at second surfaces transverse to, and displaced from, the first surfaces. The second surfaces are shaped relative to each other to provide for the detachment of the first and second members at the first surfaces upon the exertion of forces in the direction of the first surfaces.