Abstract: A device intended for flue gas passages includes a pivotable damper plate which is connected to a regulating device for automatic adjustment of the damper plate between a closed position and an open position in response to the operating condition of an installation connected to a flue gas passage. Adjustment is effected with regard to the economical operating position to prevailing outside wind conditions. An anemometric chamber with an associated diaphragm is arranged to be actuated by the gas pressure in the flue gas passage downstream of the damper plate and is connected to the damper plate in such a way that the degree of opening of the damper plate in the economical operation position is decreased for decreasing gas pressure in the flue gas passage.

Abstract: An automatic ventilation regulating device for windows, doors and the like, which have a movable portion and a fixed portion, including a spindle; a slide displaceable on the spindle; driving means for displacing the slide on the spindle, the spindle and the slide being connectable with the movable and fixed portions, respectively; and a settable thermostat arranged for controlling the operation of the driving means in response to the temperature in the room to be ventilated.

Abstract: A device in rope hoists for limiting speed when lowering a load, comprising a rotatable drum, around which the rope is to be wound, a first friction surface on one end side of said drum, and a second friction surface, unrotatable in relation to the shaft. The friction surfaces are arranged to be moved into engagement with each other automatically in response to the load to be lowered through the use of a helical surface. The friction force between the friction surfaces is proportional to the weight of the load to be lowered.