Abstract: A rectangular main frame has uprights resting upon and bolted to a shelf formed by a horizontal angle beam or corbel installed in the elevator shaft or hatchway below the floor level and at the intended location for the corridor entrance wall opening into the elevator shaft. Extending between the upper ends of the uprights is a top hanger header which subsequently supports the trackway for the corridor entrance door or doors. Also secured to the angle member is a corridor entrance sill support having secured thereto spaced parallel channel brackets projecting outward therefrom and containing pairs of keyhole slots in their vertical webs.