Abstract: An electrically operated fast-food service window with a plurality of upwardly focused infrared emitter/receivers mounted on the fast-food service window in a manner such that the emitter/receivers emit infrared beams at an angle slightly askew of an imaginary vertical plane. The sensors are used to reliably detect an employee in the immediate proximity of the fast-food service window as the employee bends over the horizontal service shelf adjacent to and attached to the fast-food service window as the employee begins to reach towards a customer. The sensors, although focused towards the interior of a building, do in not detect employees or traffic in the immediate vicinity of the fast-food service window thereby virtually eliminating the unintentional opening of the window. The uniquely oriented sensors are connected to an electric motor operator which opens the window as an employee prepares to deliver merchandise or other items to a customer.

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: 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.

Abstract: A pass-through transaction drawer with a hinged, moveable security flap is disclosed to permit the conveyance of articles, in a relatively secure manner, between an attendant or clerk within a building and a customer outside the building irrespective of the drawer size or depth. The hinged, moveable security flap is only moveable by the attendant to maximize security. The security flap can be adapted with a small contents tray to facilitate transactions involving the exchange of money or credit cards. To facilitate transactions which may require deeper transaction drawers, the transaction drawer may be adapted with an interior partition to compartmentalize a relatively deep drawer, whereby relatively larger, bulky items are conveyed in the deeper compartment and smaller articles are conveyed in the shallow compartment.