Device for operating air governing means at a refuse burning furnace

A device for operating air governing means of a refuse burning furnace comprising a number of air admittance ports in its walls, said ports communicating with an air box and each port being provided with a governing member, movable forwards and backwards in relation to said port and including means to determine the volume of air passing through the pertaining port, said member including means adapted to perform a displacement beyond a governing movement and having an inward end penetratable through the port to remove deposits accumulated on the walls thereof, the improvement in which the governing members comprise interconnected groups, each group including at least two units which are simulataneously displaceable for removal by means of a mechanism including a shaft extending outside of the air box, an externally threaded screw member non-rotatably secured to the air box enclosing the extending end of said shaft to cooperate therewith for axial displacement thereof, an axially secured, freely rotatable nut mounted at the air box in cooperation with the screw member and provided with a worm gear wheel, and a rotatable rod extending along said air box having mating worms cooperating with worm wheels at a number of operating mechanisms fitted at the air box.