received by the International Bureau on 21 January 2014 (21.01.2014)

1. A coupling device for quick mounting and demounting an integrated light source (D) connectable to a socket (C) , the coupling device comprising two tubular intermediate elements (A, B) having mutually matching cross-sections, each intermediate element (A, B) having a first ending and a second ending and being telescopically connectable with each other by inserting their first endings one into the other, their other endings being connectable to the light source (D) and to the socket (C) respectively, all the connections, both of the intermediate elements (A, B) with each other and of the intermediate elements (A, B) with respectively the socket (C) and the light source (D) , ensuring electrical current transmission from the socket (C) to the light source (D) , characterized in that each intermediate element (A, B) consists of at least two tubular members (A-a, A-b; B-a, B-b) having different cross-sections of close dimensions, the first members (A-a; B-a) of the intermediate elements (A, B) having bigger cross-sections and the second members (A-b; B-b) of the intermediate elements (A, B) having smaller cross-sections, one intermediate element (A) being telescopically connectable by its second smaller member (A-b) with a socket comprising an electrical connection and the other intermediate element (B) being telescopically connectable by its first bigger member (B-a) with the light source (D) , the coupling device comprising at least one line enabling electrical current transmission which is run inside both intermediate elements (A, B) in a tight manner.

2. The coupling device according to claim 1, characterized in that a line enabling data transmission is run inside both intermediate elements (A, B) ensuring transmission of a data signal from the socket (C) to the light source (D) .

3. The coupling device according to claim 1, characterized in that all the tubular member s (A-a, A-b; B-a, B-b) of the intermediate elements (A, B) have cross- sections selected from a group comprising: a circular cross-section, an oval cross-section, a polygonal cross- section and a rounded cross-section.

4. The coupling device according to claim 1 or 2, characterized in that the second ending of the intermediate element (A) connected with the socket (C) comprising electrical or electrical and data connections, the said second ending belonging to the second smaller member (A-b) , has its external periphery adapted to the internal shape of the socket (C) .

5. The coupling device according to claim 3, characterized in that the external dimension of the cross- section of the said second ending of the member (A-b) is adjustable depending on the internal dimension of the socket (C) .

6. The coupling device according to claim 4, characterized in that the said second ending of the member (A-b) is extended by an expanding system (5) having an adjustable internal dimension.

7. The coupling device according to claim 5, characterized in that the expanding system (5) is surrounded by an additional annular sleeve (N) made of an elastic material.

8. The coupling device according to claim 5 or 6, characterized in that the expanding system (5) comprises two plates (6, 7), each plate (6, 7) extending transversely to the tubular member (A-a), the expanding system (5) being connected with the member (A-b) by a socket head screw (8) enabling adjustment of the connection length, and in that

19 at least two expander grips (9) are radially arranged between the two plates (6, 7), each expander grip comprising a blocking element (11) and two arms (10, 10') pivotally connected with each other by their one ends and abutting one of the plates (6, 7) with their other ends, the pivot (X) connecting the arms (10, 10') being arranged on the blocking element (11) of the expanding system (5) .

9. The coupling device according to claim 6 or 7, characterized in that each blocking element (11) of the expanding system (5) consists of a plate that is parallel to the axis of the intermediate element (A) and abuts the internal surface of the socket (C) , and in that each blocking element (11) is provided on its surface abutting the internal surface of the socket (C) with an antislip layer .

10. The coupling device according to claim 6 or 7, characterized in that the annular sleeve (N) is located between the internal surface of the socket (C) and the blocking elements (11), each blocking element (11) abutting the internal surface of the sleeve (N) .

11. The coupling device according to claim 1, characterized in that the integrated light source (D) is a LED street lamp and the socket (C) comprising electrical or electrical and data connections is located in the street lamp post.

12. The coupling device according to claim 1 or 7, characterized in that the internal shape of the cross- section of the second end of the intermediate element (B) is adapted to the external shape of the cross-section of a typical integrated LED street lamp.

13. The coupling device according to claim 1, characterized in that at least one telescopic connection is provided with a blocking mechanism, preferably a pin or a peg ( 12 ) .

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14. The coupling device according to claim 1 or 8, characterized in that the telescopic connections of the intermediate elements and all the blocking mechanisms are provided with moisture and water tight gaskets.

15. The coupling device according to claim 1,

characterized in that all the tubular member s (A-a, A-b, B-a, B-b) of the intermediate elements (A, B) have circular cross-sections and in that the diameter of the member (A-a) of the tubular element (A) is adapted to be connected with the socket (C) having the internal diameter between 30 mm do 200 mm.

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