| 摘要 |
<p>An anti-jamming device for a security screen arrangement, in which a security screen is able to be rapidly fired from a rest position to an upper position at which passage of a person from one side of the screen to another is not possible, includes sensors (24, 26) for detecting whether the screen is at the rest position or the upper position. The device also includes a valve for lowering a screen when it does not reach the upper position, due to the screen having been jammed, and for reactivating the firing of the screen. The screen may be repeatedly fired until the obstruction is cleared.</p> |
