Abstract: In accordance with one embodiment of the present invention, a sliding, bi-parting, service window may be operated by pressing on a push operator. In response to such push operation, a pair of bi-parting windows may be caused to slide apart sufficiently to provide a service opening. In some embodiments the windows may automatically close when pressure is released, for example, in response to the action of a weight that moves to a position of higher potential energy in response to opening of the windows.

Abstract: A sliding service window assembly may be provided with a weight that automatically closes a window. The weight may be attached through a wire to a bracket on the top of the window so that whenever the window is released, it automatically closes. Through the use of a weight, the window closes regardless of the misorientation of the window within a building. There is no need for adjustments between the window and the frame since the inclination of the assembly is not important. In addition, because the window moves in a horizontal direction parallel to the frame, there is no misalignment between the window and the frame in the closed position which could result in air exchange.