TECHNICAL FIELD

This invention relates to a unit for destroying insects in closed rooms, particularly stables.

BACKGROUND ART

At the present time destruction of flies, insects and the like in indoor localities such as stables and hen¬ coops is largely accomplished by using various poisons smeared on places in the building where the insects land or by suspending various poisonous elements. Also direct spraying of the entire room, walls, ceiling and floor, can be made. However, this process implies some difficul¬ ties as no domestic animals can stay in the room during the spraying and therefore this method has not gained ground to a greater extention.

The hitherto known units and methods for destroying insects are not systematic as far as dosing quantities, spreading in the room and cycle period are concerned. Therefore, the efficiency is poor and moreover it entails a great danger of the insects acquiring immunity against the poison.

DISCLOSURE OF INVENTION

It is the object of the invention to accomplish a unit which effectively destroys flies and other harmful in- sects in stables and hencoops without involving incon-

veniences for the domestic animals in the stables.

According to the invention this object is achieved by a unit of the type mentioned in the introduction and cha¬ racteristic in that it comprises a number of containers with poison evenly distributed in the room, from which containers the poison is spread mistily through venturi nozzles that are connected to a common compressed air source and arranged so as to aspirate the poison from the respective containers.

Through the venturi effect the flow of air through the head of the nozzle aspirates the poisonous liquid into said nozzle head and from there the liquid is atomized out in the room in a manner known per se. By distribut¬ ing the containers with the poison evenly in the room and from there spread the poisonous liquid through a centrally situated and common compressed-air plant a possibility of a simple controlling of the poison distribution is achieved ^' , and at the same time the danger of too strong a dosing of poison at the start of the distribution, for instance on account of remain¬ ing drops from the previous distribution, is eliminated as a result of the local placing of the containers with poison directly beneath the nozzle heads.

By a preferred embodiment in practice the venturi nozzles are connected to the respective containers with poison through quick coupling means. In this way the containers with poison can be replaced while the unit is ready for operation and with no danger of the ope¬ rator contacting the dangerous poison.

According to the invention, the injection of the com¬ pressed air to the nozzles can be predeterminedly ad¬ justed in a manner dependent on the species of insect and concentration thereof regarding the duration of the introduction and/or the interval between the indi- vidual introductions. By adjusting a timer connected to

source it is possible to adjust the unit for fully auto¬ matic operation.

Furthermore, through the automatic controlling it is possible to follow the reproduction cyclus of the insect pests and thereby further increase the efficiency of the extermination campaign. Simultaneously, the possibility of immunity of the insect pests is prevented.

BRIEF DESCRIPTION OF THE DRAWING The invention is explained further in the following with reference to the drawing, in which fig. 1 schematically shows a unit according to the invention, and fig. 2 a nozzle of the unit according to fig. 1, shown in large scale.

BEST MODE OF CARRYING OUT THE INVENTION The unit shown in the drawing consists of a compressed- air container 1 with an automatically operated compres¬ sor. From there the air is lead through a filter 2, a reduction valve 3 and a solenoid valve 4, the latter is connected to a timer 5 capable of being adjusted to various operation periods, and the intervals between the operation periods (the cyclus time) are controlled by an electric chronometer 6. The tube system leading to the nozzle heads is normally made of PVC-tubes 7 , which can be assembled by standard fittings. The con¬ tainer 10 with poison is shown as drums with cover, in which a quick coupling part is mounted arranged to cooperate with a corresponding quick coupling part _. on the venturi nozzle.

Fig. 1 shows moreover how the containers with poison are placed under the roof of the building at a mutual distance corresponding to the range (radius of action) of the nozzles, so that the entire room is filled with a fine mist when the nozzles are activated by

compressed-air source.

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