Safety system for movable wing i.e. hopper window casement, has vibration sensor detecting gas force conditional change of vibration of casement and/or frame, where vibrational spectrum of casement is compensated with reference spectrum

摘要

The system has a sensor arrangement producing a switch signal during piling of a hopper window casement (12) on a bar. A vibration generator (17) stimulates vibration of the casement and/or a window frame (11). A vibration sensor (18) detects a gas force conditional change of the vibration of the casement and/or the frame to produce the switch signal. Vibrational spectrum of the casement and/or the frame is compensated with reference spectrum of an aperture angle, where the reference spectrum is provided in an electronic evaluation unit. The vibrational spectrum changes based on the angle.