I’ve spent an hour fruitlessly searching various patent databases for this one. It’s quite long enough to justify me posting this…
Think of the common door closure spring mechanism. It’s great. Now imagine it fitted with a small motor so that the door can be made to oscillate backwards and forwards.
Today’s invention is just such a device which can be use to help improve ventilation and maintain thermal equilibrium in a house or office building by wafting air backwards and forwards between rooms.
The doors would have to be driven quite slowly, through a limited arc, and have a switch to disable the motor if any resistance was sensed.
Such a system might be equipped with electronic thermometers so that it started up automatically when the ambient temperature difference between rooms exceeded some preset threshold.