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US 4,183,290 AGranted
Air vent
AssigneeSiegenia-Frank KG
InventorEckhard Kucharczyk
Life of this patent
Estimating the term…
Abstract
Sound-absorbing air vent for rooms having openings that are selectively opened or closed by an electrical motor which is controlled by a sound-sensitive element.
Claims12
Air vent for rooms where its air vent openings respectively ducts can selectively be opened or closed by electrical drives,
- characterized by the fact that a sound sensor (14) such as a microphone and a time-switch relay (15) activated by the microphone contained within a switch arrangement which, on open vent openings, puts the drive (1), not presently under current, during sound increase, immediately into the electrical circuit, first for the closure of the openings and thereafter with delayed action for the opening of the vent openings.
Dependencies are inferred from the claim text.