Method for unlocking a window pane of a railroad car with an inflatable pressure tube

DETAILED DESCRIPTION A goal of the invention is to provide an unlocking device for a window pane that has an inflatable pressure tube so arranged that upon inflation, it comprises a simple means providing nearly complete assurance that the window pane will fall out of the frame in an emergency.
This goal is achieved according to the invention in that the pressure tube is inflated when actuated by at least one pyrotechnic gas generator.
Gas generators are produced in large quantities today and are absolutely reliable.
In addition, they take up only a very small amount of space so that the generators can be integrated directly into the frame of the window pane.
Ignition is performed electrically, either centrally for a plurality of window panes by a control electronic system for example, or decentrally for each window pane separately.
Advantageously, the pressure tube is inflated by more than one gas generator upon actuation.
This results in a considerable increase in safety, since if one gas generator fails, the other(s) will take over its function.
In an especially advantageous embodiment, the pressure tube is inflated by two gas generators located on each lengthwise side of the window pane.
Each gas generator is advantageously connected by a tubular connecting piece with the pressure tube.
According to the invention, however, the pressure tube can also be connected by a plurality of tubular connecting pieces with an single gas generator, for example.
In a preferred embodiment, the window pane is also urged in the ejection direction by a spring.
This ensures complete ejection of the window pane, even under unfavorable conditions.
According to the invention, this method can be used advantageously for window panes in railroad cars or in motor vehicles.
This method is especially advantageous when the window panes are glued in place, i.
e.
when the fastening element includes an adhesive bond, since the adhesive bond can be subjected to an excessive load by the mechanical forces that the pressure tube exerts on it