The object of the invention is a unit fixing insulation to the wall intended both for styrofoam insulation as well as for mineral wool insulation.

USA patent specification no. 7.320.179. discloses a unit fixing insulation to a wall. This unit is formed by a pressing plate with a shaft, which houses a sleeve locating pin which is ended with an expansion zone. A locating pin houses an expansion element in the form of a steel screw with a head at one end and a thread at the other, i.e. from the side inserting in the locating pin, in particular within its expansion zone. The head of the expansion element is adapted for receiving a tip of a drill or drill - screwdriver, which allows screwing the threaded portion of the expansion element in the locating pin expansion zone. A hexagonal nut, to which a metal shield is welded, is applied onto the tip of the drill, wherein the metal shield is positioned at a predetermined distance from the nut, and is connected to it through the shoulders. While the drill tip rotates, the hexagonal nut engages the seat of the pressing plate causing also the rotation of the pressing plate, whose edges are provided with teeth. Teeth of the pressing plate are cutting the insulation until the metal shield rests against the insulation. As a result, a cavity is formed between the outer surface of the pressing plate and the outer surface of the insulation, which has to be provided with additional insulation fitting.

German patent specification DE 10 2006 042 052 also discloses a unit fixing insulation to a wall. This unit is formed by a pressing plate connected with a locating pin which ends with an expansion zone. A locating pin houses an expansion element in the form of a steel screw. A circular insulating fitting with slits in the centre is attached to the pressing plate. The fixing unit is inserted in the previously drilled hole, where after a long drill tip is inserted through the circular fitting slits into the locating pin hole. Drill rotations cause screwing of the expansion element into the expansion zone of the locating pin.

A unit fixing insulation to a wall, according to the invention, is formed with the locating sleeve which is ended at one end with an expansion zone and with a circular plate at the other end, whereas the locating sleeve houses an expansion element, preferably in the form of a screw. A unit according to the invention, characterised in that the expansion element has a head embedded permanently in the sleeve with an outer thread and a polygonal hole is provided within the sleeve. The locating sleeve has a diameter with gradation, wherein a diameter is larger from the inlet side, wherein the length L ₂ of the locating sleeve from the step to its end is equal to or larger than the length Li of the expansion element from the point of being connected to the sleeve to its end. Whereas, a larger inner diameter of a locating sleeve is larger than the outer diameter of the sleeve fixedly joined to an expansion element, wherein the length of a larger inner diameter of the locating sleeve is equal to or longer than the length of the sleeve fixedly joined to an expansion element. The end of a locating sleeve has a ribbed outer surface and slitted on both sides, wherein the outermost slits are ended with a circular opening.

A unit fixing insulation to a wall, according to the invention, is characterised by a simple structure and yet a preferred functionality. Application of the unit for fixing the insulation to the wall will cause not only its durable attachment but also its additional advantage is that the fixing is fast, because fixing the unit is obtained during one short operation. Having performed preparatory activities involving drilling the hole and inserting the fixing unit into the hole, a drill tip of the drill- screwdriver is inserted into the hole of the sleeve fixedly joined to an expansion element and after a few rotations of the drill-screwdriver an insulation is fixed to the wall and the wall section is insulated flush with the entire insulation. Simultaneous fixing of the insulation in the form of the fixing unit does not create a thermal bridge, what might cause a heat loss and additionally prevents penetrating of moisture. Using a special sleeve attached onto the head of the fixing element causes insulating a metal fixing element from the outer surface, which eliminated the thermal bridge, through which the heat could pass to the outside of the wall insulation and the shape of this sleeve seals the connection against penetrating of moisture. At the same time the shape of the sleeve allows the use of drill- screwdriver for fixing the fixing unit. Ending the slits with a circular opening causes significant weakening of the cross-section of the locating sleeve, additionally choice of mutual lengths of the expansion element and the locating sleeve and its gradation creates the conditions so that while screwing the expansion element, part of the locating sleeve is compressed, which in turn allows free insulation compressing without the need to move the whole locating sleeve.

The unit fixing insulation to the wall, according to the invention is described in more details in the embodiment and the drawing, in which fig. 1 shows a cross- section through the fixing unit located in the opening and prepared for being fixed in the insulation, fig. 2 is the top view of the unit shown in fig.1 , whereas fig. 3 shows a fragment of the unit fixed in the insulation, while fig. 4 shows a variation of the unit fixed in the insulation and the wall.

As it is illustrated in fig. 1 to fig. 4, the unit fixing insulation to the wall is formed with the locating sleeve 1 which is ended at one end with the expansion zone 2, while at the other end with the circular plate 3. The locating sleeve 1 houses an expansion element 4, in the form of a screw. The expansion element 4 has a head embedded permanently in the sleeve 5 with an outer thread and a polygonal hole 6 is provided within the sleeve 5. A locating sleeve 1 has a diameter with gradation, wherein a larger diameter is from the inlet side. A larger inner diameter D of a locating sleeve 1 is larger than the outer diameter Di of the sleeve 5 fixedly joined to an expansion element 4. The length of a larger inner diameter D of the locating sleeve 1 equals the length of the sleeve 5 fixedly joined to an expansion element 4. The end of a locating sleeve 1 in the form of the expansion zone 2 has a ribbed outer surface and slitted on both sides, wherein the outermost slits 7 are ended with a circular opening 8 which causes significant weakening of the cross-section of the locating sleeve 1 , so that at this weakened place the locating sleeve 1 is expanded while screwing the expansion element 7 into it. Holes 9 are made in the circular plate 3, along the entire circumference of a plate 3.

The locating sleeve 1 is inserted into the hole, previously made in the insulation and the wall, then the expansion element 4 is inserted within the locating sleeve 1, while a drill tip of the drill-screwdriver is inserted into the sleeve 5 fixedly joined to an expansion element and in particular to its profiled polygonal hole 6. Switching on the drill-screwdriver the expansion element rotates and moves along the locating sleeve 1. In the final phase, a locating part of the sleeve 1 moves together with the circular plate 3, causing pressing of the circular plate 3 into the insulation, while the expansion zone 2 is partially compressed. A circular plate 3 and a sleeve 5 are positioned at the insulation level which facilitates laying the subsequent wall decorative layers, and at the same time two elements form the insulation, so that there are no thermal bridges which might cause a loss of heat as shown in fig. 3 and fig. 4.