Abstract: A device for securing sliding windows and doors includes a telescoping bar and a plate. An end of the bar and the plate together form a connector pair that couples the bar end to the plate in one of a separable orientation and an inseparable orientation according to a relative angle between the bar end and the plate. The connector pair allows the bar to be separated from the plate in the separable orientation when the relative angle is a first angle, and the connector pair prevents the bar end being separated from the plate in the inseparable orientation when the relative angle is a second angle. A lock in the locked position physically prevents the relative angle between the bar end and the plate being changed from the second angle to the first angle. A T-bar or side-wing may prevent unlocking when the window or door is open.

Abstract: A device for securing sliding windows and doors includes a telescoping bar and a plate. An end of the bar and the plate together form a connector pair that couples the bar end to the plate in one of a separable orientation and an inseparable orientation according to a relative angle between the bar end and the plate. The connector pair allows the bar to be separated from the plate in the separable orientation when the relative angle is a first angle, and the connector pair prevents the bar end being separated from the plate in the inseparable orientation when the relative angle is a second angle. A lock in the locked position physically prevents the relative angle between the bar end and the plate being changed from the second angle to the first angle. A T-bar or side-wing may prevent unlocking when the window or door is open.

Abstract: A window security device has a support rod capable of securely contacting an upper window frame and a lower window frame. The device has two horizontal arms extending from away from the support rod terminating in thin blades capable of sliding between a first stationary window and a second sliding window sash. The device prevents unwanted tampering with the device by children located on the inside of the window as well as burglars located on the exterior of the window and to be easily removed in the event of a fire. The length of the device's blade can be adjusted allow a window to safely remain open a specified distance, and the device's arms can be adjusted to fit many different widths of windows. When the blades are disposed between the windows, the window is slid open and contacts the window stop, located at the end of the horizontal arms.