Abstract: An automatic sliding door or window latching device which includes a hook attached to a door or window jamb immediately opposite the door or window frame where a merchanism containing a bendable plate having a hole in the center thereof is placed. When the door or window is pushed closed, the plate moves up over the hook until the opening is reached at which point said plate snaps firmly against said hook. The plate is attached to an axle and corresponding handles such that when one of said handles is turned, the plate moves away from said hook, unlatching the door or window. In order to avoid deforming the plate during use, the range of rotation of said handles may be limited according to the size of an opening into which a tab attached to a key slided over said axle is displaced.

Abstract: An automatic door or window closing device which includes a tube attached to the edge of a moveable door or window. The tube has a weight displaced therein with a cable attached at the top which passes out of the top of the tube across a pulley and is connected to the door or window jam. A pneumatic seal is provided between the weight and the inside wall of the tube and works in conjunction with a port and valve at the bottom of the tube for controlling the flow of air passing therethrough. When the door or window is opened, the weight rises in the tube. When the door or window is released, the weight drops in the tube according to the adjustment of the port and valve at the bottom of the tube, until the door or window is completely closed.