Sliding door arrangement

1. A door operating assembly for operating a sliding door leaf driven by a drive unit along a sliding door rail, the door operating assembly comprising:

a door bracket configured to position the door leaf relative the rail;

a drive member adapted to be driven by the drive unit; and

a lever arm having one end pivotally coupled to the drive member and a remote portion pivotally connected to the door bracket via a cam structure such that a vertical position of the door leaf relative the rail varies when the lever arm pivots, wherein the door bracket comprises a guiding pin that is received by a groove in the cam structure, and wherein the guiding pin is configured to travel from one end position of the groove to another end position of the groove as the lever arm pivots.

2. The door operating assembly according to claim 1 , wherein the lever arm is connected to a door operating trolley engaged with the sliding door rail in a sliding manner.

3. The door operating assembly according to claim 1 , wherein the door bracket comprises a first portion extending along a part of the lever arm and a second portion adapted to be fixed to the door leaf, the door bracket being movable in relation to the lever arm.

4. The door operating assembly according to claim 3 , wherein the first portion comprises a tilted surface, the lever arm comprises a tilted surface, and wherein the tilted surface of the first portion is slidable relative the tilted surface of the lever arm.

5. The door operating assembly according to claim 1 , wherein the drive member is fixedly connected to a belt driven by the drive unit.

6. The door operating assembly according to claim 1 , wherein the cam structure forms an eccentric connection between the lever arm and the door bracket.

7. The door operating assembly according to claim 1 , wherein the cam structure being disposed on a substantially plate-shaped member of the lever arm.

8. The door operating assembly according to claim 7 , wherein the cam structure comprises two end portions arranged at different radius from the centre of the remote portion of the lever arm.

9. The door operating assembly according to claim 8 , wherein at least one of said end portions is arranged adjacent to a curved portion of the cam structure.

10. The door operating assembly according to claim 1 , wherein the lever arm comprises a second end being connected to a hook member via a rod extending substantially parallel to the rail, the hook member being adapted to be retained against a fixed lip of the rail.

11. The door operating assembly according to claim 10 , wherein the rod, upon a pivot movement of the lever arm, is tilted relative the rail for releasing the hook member from the lip.

12. A sliding door assembly comprising:

a sliding door leaf;

a sliding door rail;

a drive unit configured to drive the door leaf along the door rail; and

a door operating assembly comprising:

a door bracket configured to position the door leaf relative the door rail;

a drive member adapted to be driven by the drive unit; and

a lever arm having one end pivotally coupled to the drive member and a remote portion pivotally connected to the door bracket via a cam structure such that a vertical position of the door leaf relative the rail varies when the lever arm pivots, wherein the door bracket comprises a guiding pin that is received by a groove in the cam structure, and wherein the guiding pin is configured to travel from one end position of the groove to another end position of the groove as the lever arm pivots.

13. The sliding door assembly according to claim 12 , the sliding door assembly comprising at least two of the door operating assemblies.

14. A method for providing a sliding door assembly for operating a sliding door leaf driven by a drive unit along a sliding door rail, the method comprising:

positioning the door leaf relative the rail by means of a door bracket;

connecting a drive member to the drive unit; and

connecting the drive member to the door bracket by means of a lever arm having one end pivotally connected to the drive member, and a remote portion pivotally connected to the door bracket via a cam structure such that a vertical position of the door leaf relative the rail varies when the lever arm pivots, wherein the door bracket comprises a guiding pin that is received by a groove in the cam structure, and wherein the guiding pin is configured to travel from one end position of the groove to another end position of the groove as the lever arm pivots.

15. A method for operating a sliding door leaf driven by a drive unit along a sliding door rail, the method comprising:

positioning the door leaf relative the rail by means of a door bracket;

connecting a drive member to the drive unit; and

connecting the drive member to the door bracket by means of a lever arm having one end pivotally connected to the drive member, and a remote portion pivotally connected to the door bracket via a cam structure such that a vertical position of the door leaf relative the rail varies when the lever arm pivots, wherein the door bracket comprises a guiding pin that is received by a groove in the cam structure, and wherein the guiding pin is configured to travel from one end position of the groove to another end position of the groove as the lever arm pivots; and

driving said door leaf between an open and closed position, whereby in the open position the lever arm is pivoted such that the door leaf is raised vertically, and in the closed position the lever arm is pivoted such that the door leaf is lowered vertically.