Track apparatus, delivery shuttle car and material handling system

1. A rack apparatus for guiding a carriage to deliver an article to or from a destination area, comprising:

a first rack at a first side of the rack apparatus extending in a first direction;

a second rack opposed to the first rack, disposed at a second side of the rack apparatus and parallel or substantially parallel to the first rack;

a third rack disposed between the first rack and the second rack, extending in a second direction and perpendicular or substantially perpendicular to the first direction; and

an intersection between the third rack and each of the first and the second racks,

wherein each of the first, second and third racks comprises two rails in parallel;

wherein the intersection comprises a plurality of slabs that are capable of guiding the carriage to move in either the first direction or the second direction;

wherein the plurality of slabs comprises a first slab and a second slab, wherein each of the first and second slabs are capable of moving in the third direction between a first position and a second position; and

wherein the plurality of slabs further comprises a third slab; and wherein the third slab can move in the second direction between a third position and a fourth position.

2. The rack apparatus of claim 1 , wherein

when the first and second slabs are in the first position and the third slab is in the third position, the carriage is capable of moving along one of the first and second racks; and

when the first and second slabs are in the second position, and the third slab is in the fourth position, the carriage is capable of moving along the third rack.

3. The rack apparatus of claim 1 , wherein the first slab has a first side wall and the first side wall has a first plurality of gear teeth or notches; and the first plurality of gear teeth or notches can guide the movement of the carriage in the first direction.

4. The rack apparatus of claim 1 , wherein the first slab has a first side wall and a second arc-shaped side wall, wherein

the first side wall has a first plurality of gear teeth or notches; and the first plurality of gear teeth or notches can guide the movement of the carriage in the first direction; and

the second arc-shaped side wall has a second plurality of gear teeth or notches, so that the second plurality of gear teeth or notches can guide the carriage to move in the first direction to the second direction, or vice versa.

5. The rack apparatus of claim 1 , wherein the second slab has a first arc-shaped side wall so that the carriage can be guided to move in the first direction to in the second direction, or vice versa.

6. The rack apparatus of claim 2 , wherein the third slab has a second arc-shaped side wall and the second arc-shaped side wall has a second plurality of gear teeth or notches, so that the second plurality of gear teeth or notches can guide the carriage to move in the first direction to in the second direction, or vice versa.

7. The rack apparatus of claim 1 , further comprising:

a fourth rack disposed between the first rack and the second rack, extending in the second direction, parallel or substantially parallel to the third rack, and separated from the third rack in a third direction; and

an intersection between the fourth rack and each of the first and the second racks;

wherein the intersection comprises a plurality of slabs that are capable of guiding the carriage to move in either the first direction or the second direction.

8. The rack apparatus of claim 7 , wherein the third rack and the fourth rack form a closed-loop path for the carriage through the intersection.

9. The rack apparatus of claim 1 , wherein each of the first and the second racks has a third side wall and the third side wall has a third plurality of gear teeth or notches; and the third plurality of gear teeth or notches can guide the movement of the carriage in the first direction; and

each of the third and fourth racks has a fourth side wall and the fourth side wall has a fourth plurality of gear teeth or notches; and the fourth plurality of gear teeth or notches can guide the movement of the carriage in the second direction.

10. The rack apparatus of claim 1 , wherein the intersection further comprises a first member, wherein the first member is disposed between an upper member and a lower member of one of the first and second racks, and the first member can guide the movement of the carriage in the first direction.

11. The rack apparatus of claim 10 , wherein the first member has a fifth side wall and the fifth side wall comprises a fifth plurality of gear teeth or notches; and the fifth plurality of gear teeth or notches can guide the movement of the carriage in the first direction.

12. The rack apparatus of claim 10 , wherein the intersection further comprises a second member, wherein the second member can guide the movement of the carriage in the second direction.

13. The rack apparatus of claim 12 , wherein the intersection further comprises a third member attached to the second member; the third member has a sixth side wall; the sixth side wall comprises a sixth plurality of gear teeth or notches; and the sixth plurality of gear teeth or notches can guide the movement of the carriage in the second direction.

14. The rack apparatus of claim 13 , wherein the intersection further comprises a fourth member attached to the second member, and the fourth members has a second arc- shaped side wall so that the carriage can be guided to move in the first direction to the second direction, or vice versa.

15. The rack apparatus of claim 14 , wherein the second, third and the fourth members are extended from the third rack, the first and second members can be orientated to be in the same plane in the third direction;

the second, third and the fourth members can be integrated as one part of the intersection; and

the first and second members can be an integrated as one part of the intersection of the intersection.