Self-lifting robotic device with load handling mechanism

1. A robotic device for carrying loads and movable in a vertical direction between rails arranged in multiple rows at various levels with respect to ground, the robotic device comprising:

a frame,

wheels coupled to the frame for moving the frame along the rails, and

a movable platform provided on the frame, the platform being configured for moving with respect to the frame to move the frame in a vertical direction between first rails and second rails arranged above the first rails, and for placing onto the robotic device a first load arranged at a first level with respect to the ground, and a second load arranged at a second level with respect to the ground,

wherein the platform is configured for carrying support handles movable by the platform in a vertical direction with respect to the frame and configured for raising the frame with respect to the second rails when the support handles push against the second rails.

2. The device of claim 1 , further comprising a wheels turning mechanism for turning the wheels with respect to a direction of the second rails when the frame is raised with respect to the second rails.

3. The device of claim 2 , wherein the platform is further configured for carrying a grasping element movable by the platform in a horizontal direction with respect to the frame to take a load and place the load onto the platform.

4. The device of claim 3 , wherein the platform is configured for enabling the grasping element to take the first load when the wheels are placed on the first rails, and for enabling the grasping element to take the second load when the wheels are placed on the second rails.

5. The device of claim 4 , wherein the platform is configured to carry the first load while the platform is raised with respect to the frame to place the wheels on the second rails.

6. The device of claim 5 , further comprising a holding element for holding the first load when the grasping element takes the second load and place the second load onto the platform.

7. The device of claim 6 , further comprising a side wall, wherein the holding element is configured to extend from the sidewall.

8. The device of claim 7 , wherein the first load is arranged at a first side from the first rail, and the platform is configured for enabling the grasping element to take a third load arranged at a second side from the first rail when the wheels are placed on the first rails.

9. The device of claim 8 , wherein the platform is configured to enable the grasping element to take the first load when the platform is raised at a first vertical level with respect to the frame, and to enable the gripping element to take the third load when the platform is raised at a second vertical level with respect to the frame.

10. The device of claim 9 , wherein the platform is configured to carry the first load when the platform is raised to take the third load.

11. A method of operating a robotic device movable in a vertical direction from first rails to second rails arranged at a different vertical level than the first rails, and having a frame, wheels coupled to the frame for moving the frame along the first and second rails, and a movable platform provided on the frame, the method comprising the steps of:

placing a first load onto the platform,

moving the platform with the first load in a vertical direction with respect to the frame so as to provide engagement between the platform and the second rails,

moving the frame in the vertical direction by the platform, and

placing a second load onto the platform,

wherein the first and second loads are arranged at different levels with respect to the ground before being placed onto the platform.

12. The method of claim 11 , further comprising the step of turning the wheels with respect to the direction of the second rails when the frame is moved in the vertical direction with respect to the second rails.

13. The method of claim 12 , further comprising the step of operating a grasping element arranged on the platform to take the first load and place the first load onto the platform.

14. The method of claim 13 , further comprising the step of operating a holding element to keep the first load by the holding element when the platform moves in the vertical direction with respect to the holding element, before the second load is placed onto the platform.

15. The method of claim 11 , wherein the platform is moved in the vertical direction at a distance greater than a distance between the first rails and the second rails.