Closing mechanism controlled by sound pulses for ventilation vanes

摘要

TECHNICAL PROBLEM OF THE INVENTION: To eliminate sound emissions (disturbing noises, for example vehicle noise), in that an automatic closing of the ventilation aperture takes place when sound levels which become critical are reached. SOLUTION: When the critical loudness level is reached, a listening microphone transmits the closing pulse to a relay which effects the closing by means of known commercially available mechanisms (fittings). After the noise level falls again, the same mechanism opens the aperture again. POSSIBLE USES: Rooms with a need for natural ventilation which are sensitive to disturbance, are still unprotected from the point of view of construction or can be protected only at a very high cost.