Expandable and collapsible structure with rollers

1. An expandable and collapsible structure, comprising:

a plurality of roller supports, each roller support including at least two ends separated by a non-zero distance, at least one horizontal roller disposed at one of the at least two ends of the roller support, and two vertical leg members; and

a folding assembly consisting of two pairs of strut members disposed between each two successive ones of the plurality of roller supports, opposite ends of each strut member being pivotably and non-slidably attached to respective legs of successive ones of the two successive ones of the plurality of roller supports.

2. The expandable and collapsible structure as set forth in claim 1 , wherein the two strut members are pivotably connected to each other by a pin.

3. The expandable and collapsible structure as set forth in claim 1 , wherein the two strut members are telescopic.

4. The expandable and collapsible structure as set forth in claim 1 , wherein the vertical leg members are telescopic.

5. The expandable and collapsible structure as set forth in claim 1 , wherein the plurality of roller supports is rectangular.

6. The expandable and collapsible structure as set forth in claim 5 , wherein at least one roller support comprises at least two vertical legs and at least two horizontal legs disposed between the at least two vertical legs.

7. The expandable and collapsible structure as set forth in claim 6 , wherein a top one of the at least two horizontal legs comprises the roller disposed at the top of the roller support.

8. The expandable and collapsible structure as set forth in claim 7 , wherein the roller defines at least part of the top one of the at least two horizontal legs.

9. The expandable and collapsible structure as set forth in claim 1 , further comprising at least one tension member disposed between the two of the plurality of roller supports.

10. The expandable and collapsible structure as set forth in claim 1 , further comprising at least one compression member disposed between the two of the plurality of roller supports.

11. The expandable and collapsible structure as set forth in claim 1 , wherein at least one roller on at least one roller support is a cylinder.

12. The expandable and collapsible structure as set forth in claim 1 , wherein at least one roller on at least one roller support is a ball.

13. An expandable and collapsible structure, comprising:

a plurality of roller supports, each roller support including at least two ends separated by a non-zero distance and at least one roller disposed at one of the at least two ends of the roller support; and

at least one folding assembly disposed between two of the plurality of roller supports,

wherein the plurality of roller supports include two vertical leg members, the at least one scissor assembly comprises at least two strut members, and a first end and a second end of a first strut of the at least two strut members are pivotably connected to a first roller support directly to a bottom part of a first one of the two vertical leg members of the first roller support and to a second roller support directly to a top part of a first one of the two vertical leg members, respectively, and a first end and a second end of a second strut of the at least two strut members are pivotably connected to the first roller support through a spacer to a top part of the first one of the two vertical leg members of the first roller support and to the second roller support through a spacer to a bottom part of the first one of the two vertical leg members, respectively.

14. The expandable and collapsible structure as set forth in claim 13 , wherein the at least two strut members are pivotably connected to each other by a pin.

15. The expandable and collapsible structure as set forth in claim 14 , wherein the at least two strut members are telescopic.