Abstract: A rectangular window frame defined by four frame members, has two spline members supported by a pair of laterally spaced frame members. The spline members are formed with blade portions arranged to retain a sash in the window frame. One on both of the spline members are longitudinally slidable in a tubular frame portion against a spring bias and each is normally retained at one end in a socket formed in an adjacent frame member. The spring bias is provided by a coil spring in the tubular frame portion bearing against the other end of the spline member. When the spline member is disengaged from the pocket it is rotatable out of the way to permit the sash to be installed in or removed from the window frame. The blade portion of each longitudinally slidable spline member may be formed with an aperture or slot to receive a tool for longitudinally sliding the spline member to disengage it from the retaining socket.