[002] In electrical vacuum cleaners, flexible hoses which generally have helical threaded surface structures are used between the body and the accessories. A hose coupling, which ensures the pipes, handles or suction nozzles to be fixed in a stable or in a non- stable manner, is fixed on the end of the hose which is not connected to the electrical vacuum cleaner. If a sound connection between the hose and the hose coupling is not achieved, a reduction in efficiency and deformation or fracturing of the hose during usage occurs due to air leakage. Benefiting from the helical threaded surface structure of the hose in order to fix the hose coupling is a known method. Usually adhesive substances are used for preventing dislocation or loosening of the hose coupling during usage which is manufactured so that it can be fixed on the helical threaded surface structured hose. In the embodiments wherein adhesive substances are not used for fastening, the hose coupling is fixed on the hose with additional fastening parts which increase cost and the fastening is durable for only a short time.

[003] The European Patent No. EP0376691 discloses a hose fastening part which has projections on its side walls for fixing the hose and which has a rugged structure on the propping surface of the end section of the hose in order to prevent loosening and dislocation by rotating.

[004] The Japanese Utility Model No. 59-2753 discloses a flange made up of two parts comprising a circular projection on the end of the hose and a canal, fixed peripherally on the said projection which enables the hose to make a relative movement in the inner surface and a vacuum accessory connected on the said flange.

[005] The American Patent US4625998 discloses a hose fastening part which is connected to the hose with a threaded structure and which comprises a flange which is curled inwards in the propping surface in order to fasten the hose and a canal structure.

[006] The object of this invention is to provide a hose coupling which enables fastening the hose in electrical vacuum cleaners with elements such as handles and extension pipes or suction nozzles without the need of adhesive substances or additional parts.

[007] A hose coupling realized in order to attain above-mentioned objects of the invention has been illustrated in the attached drawings, wherein; [008] Figure 1-is a schematic view of an electrical vacuum cleaner.

[009] Figure 2-is a schematic view of a right helix hose.

[010] Figure 3-is a schematic view of a left helix hose.

[011] Figure 4-is a perspective view of a hose coupling.

[012] Figure 5-is a schematic view of a hose coupling and a hose.

[013] Figure 6-is a C-C sectional view of a hose coupling.

[014] Figure 7-is an A-A sectional view of a hose coupling.

[015] Figure 8-is a schematic view of a handle, a hose coupling and a hose.

[016] Figure 9-is a sectional view of a hose coupling which has projections on its inner wall.

[017] Figure 10-is a schematic view of a hose coupling which has projections on its outer wall.

[018] Figure 11-is a schematic view of a right helix hose which is fixed on a hose coupling and which faces the projections from the side.

[019] Figure 12-is a schematic view of a right helix hose which is fixed on a hose coupling and which faces the projections from the front.

[020] Figure 13-is a schematic view of a left helix hose which is fixed on a hose coupling and which faces the projections from the side.

[021] Figure 14-is a schematic view of a left helix hose which is fixed on a hose coupling and which faces the projections from the front.

[022] The figures have been each numbered corresponding the following: 1. Hose 2. Handle 3. Pipe 4. Suction nozzle 5. Hose coupling 6. Projection 7. Inner wall 8. Outer wall 9. Hose recess 10. Inlet opening 11. Propping surface 12. Sealing extension 13. Flange 14. Latch 15. Inner surface 16. Outer surface [023] The electrical vacuum cleaners comprise a hose (1) which has preferably a flexible and helical threaded structure that inclines to the right and left, a handle (2) which enables the user to hold it, a pipe (3) which is connected to the handle (2) and which is made up of metal or preferably hard plastic material, a suction nozzle (4) which is used by being fixed to the end of the pipe (3) in order to clean rugs and/or hard floors and a hose coupling (5) which enables the hose (1) to be fastened on the handle (2) and the pipe (3) or the suction nozzle (4).

[024] The hose (1), has a helical threaded structure which is identified with an inclination angle (B) which inclines freely to the right and to the left and pitch (H), comprising a threaded inner surface (15) and a threaded outer surface (16).

[025] The hose coupling (5) comprises a hose recess (9) wherein the hose (1) is connected and fastened, an inlet opening (10) wherein the end section of the hose (1) is inserted to fix it by rotating, a propping surface (11) on which the end section of the hose is set against it to fix it by rotating, a sealing extension (12) which ensures sealing when the handle (2), the pipe (3) or the suction nozzle (4) is mounted, a flange (13) which enables the pipe (3) or the suction nozzle (4) to fit inside the hose coupling (5) and one or more latches (14) which ensure that the handle (2), the pipe (3) or the suction nozzle (4) is not dislocated after they have been mounted.

[026] Hose recess (9) comprises an inner wall (7) which is in contact with the inner surface (15) of the hose (1), an outer wall (8) which is in contact with the outer surface (16) and one or more projections (6) which form almost a right angle with the central axis of the hose (1) and which are almost parallel to each other, which enable the hose coupling (5) to be fastened by rotating on both the right and left helical hoses (1) and which enable fastening without the need of another part, an appliance or an adhesive substance.

[027] The projections (6) are positioned in such a way that there are gaps which enable the helical threaded structure of the hose (1) to jump from one projection (6) to the other in both directions between the projection (6) groups made up of projections (6) which are parallel to each other and which are inside the hose recess (9) preferably with an arc shape.

[028] The vertical distance between the projections (6) in the projection group which are made up of more than one projection (6) is equal to each other and almost to the pitch measurement (H) of the helical threaded structure of the hose (1).

[029] In the preferred embodiment of the invention, the hose recess (9) comprises two projection (6) groups where their vertical positions in relation to each other are shifted half (H/2) the size of the pitch measurement of the helical threaded structure of the hose (1) to be fastened on the right or left helical hose (1).

[030] In the preferred embodiment of the invention, the projections (6) are positioned as two projection (6) groups opposite to each other in the recess on the inner wall (7).

[031] The hose coupling (5) is placed inside the helical threaded structured hose (1), which has an inclination to the right or left, in a way that the outer wall (8) is in contact with the outer surface (16) and the inner wall (7) is in contact with the inner surface in the inlet opening direction (10). As the hose coupling (5) is rotated the helical threaded structure of the hose (1) moves between the projections (6) like it moves inside a bolt.

As the projections (6) are parallel to each other and vertical to the central axis of the hose (1), the inclination angle (B) of the helical threaded structure of the hose (1) is forced to approach zero. As the hose (1) has a flexible structure, the helical threaded structure of the hose (1) between the projections (6) allows the formation of a fractured helical structure by being somewhat deformed. The inclination angle (B) between the projections (6) when the hose coupling (5) is rotated each time, the number of the projections (6) which are in contact with the hose (1) that is forced to approach zero and consequently the friction surfaces on which pressure is applied by setting against each other is increased. When the end of the hose (1) reaches the propping surface (11), the force required for taking off the hose coupling (5) by rotating it in the reverse direction reaches the maximum value and a strong loclcing between the hose coupling (5) and the hose (1) is obtained.

[032] In another embodiment of the invention, the projections (6) are positioned as two projection (6) groups opposite to each other in the recess on the outer wall (8).

[033] As a result of the hose coupling (5), which is the subject of the invention, being mounted to the hose (1) by rotating the desired fastening is ensured without the need of using an additional part or an adhesive substance and loosening and dislocation of the hose (1) during usage is prevented. At the same time, the deformation and fractures caused when an additional fastening part or an adhesive substance is used is prevented.