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A low profile roller includes a wheel mounted on a hollow hub and having a roller ball mounted within the hollow hub. The roller is configured to function in a first, low profile operating mode when the roller ball is in contact with a support surface and in a second, high profile mode when the whee

A low profile roller includes a wheel mounted on a hollow hub and having a roller ball mounted within the hollow hub. The roller is configured to function in a first, low profile operating mode when the roller ball is in contact with a support surface and in a second, high profile mode when the wheel is in contact with the support surface. A base for a movable support platform includes a base frame and a pivot sleeve rotatably mounted to the base frame and non-rotatably mounted to an arm connected to the hub. The pivot sleeve is configured to rotate the low profile roller from between the first mode and the second mode. A butterfly foot pedal is operably connected to the pivot sleeve.

대표청구항 ▼

What is claimed is: 1. A convertible low profile roller comprising: a hub; a first roller rotatably mounted to the hub and having an axis of rotation; a second roller rotatably mounted to the hub and having an axis of rotation; wherein the axis of rotation of the first roller intersects the second

What is claimed is: 1. A convertible low profile roller comprising: a hub; a first roller rotatably mounted to the hub and having an axis of rotation; a second roller rotatably mounted to the hub and having an axis of rotation; wherein the axis of rotation of the first roller intersects the second roller and the axis of rotation of the second roller intersects the first roller, and wherein the first roller is configured to contact a floor surface with the hub in a first orientation and the second roller is configured to contact the floor surface with the hub in a second orientation perpendicular to the first orientation. 2. The roller of claim 1, further comprising an arm portion, said hub being mounted to said arm portion. 3. The roller of claim 1, further in combination with a support base, the arm portion mounting the hub to the support base. 4. The roller of claim 3, wherein the support base comprises an equipment base. 5. The roller of claim 1 wherein the first roller defines a first height of the hub above the floor surface, the second roller defines a second height above the floor surface, and wherein the first height is greater than the second height. 6. The roller of claim 1 wherein the first roller comprises a ball and the second roller comprises a wheel. 7. A convertible low profile roller comprising: a hub; a first roller rotatably mounted to the hub; a second roller rotatably mounted to the hub; wherein the first roller is configured to contact a floor surface with the hub in a first orientation, the second roller is configured to contact the floor surface with the hub in a second orientation, the hub is mounted to an arm portion, and the hub is shifted from the first orientation to the second orientation by rotation of the arm portion about a longitudinal axis, wherein the first roller defines a first height of the arm portion above the floor surface, and the second roller defines a second height above the floor surface greater than the first height. 8. The roller of claim 7, wherein the longitudinal axis is offset from a center of the hub. 9. The roller of claim 8, wherein the first roller comprises a ball and the second roller comprises a wheel. 10. The roller of claim 7, further in combination with a support base, the arm portion mounting the hub to the support base. 11. A convertible low profile roller comprising: a hub; a first roller rotatably mounted to the hub; a second roller rotatably mounted to the hub; wherein the first roller is configured to contact a floor surface with the hub in a first orientation, the second roller is configured to contact the floor surface with the hub in a second orientation, the hub is mounted to an arm portion, and the hub is shifted from the first orientation to the second orientation by rotation of the arm portion about a longitudinal axis, wherein the hub comprises a hollow cylindrical portion, and the first roller is rotatably housed with the hollow cylindrical portion. 12. The roller of claim 11, wherein the second roller is rotatably mounted to an outer surface of the hollow cylindrical portion. 13. The roller of claim 11, wherein the longitudinal axis is offset from the center of the hub. 14. The roller of claim 11, further in combination with a support base, the arm portion mounting the hub to the support base. 15. A convertible low profile roller comprising: a hub; a first roller rotatably mounted to the hub; a second roller rotatably mounted to the hub; wherein the first roller is configured to contact a floor surface with the hub in a first orientation, the second roller is configured to contact the floor surface with the hub in a second orientation, the hub is mounted to an arm portion, the hub is shifted from the first orientation to the second orientation by rotation of the arm portion about a longitudinal axis, and wherein the first roller is a ball and the second roller is a wheel. 16. The roller of claim 15, wherein the hub comprises a hollow cylindrical portion, and the ball is rotatably housed with the hollow cylindrical portion. 17. The roller of claim 16, wherein the wheel is rotatably mounted to an outer surface of the hollow cylindrical portion. 18. A convertible low profile roller comprising: a hub; a central roller rotatably mounted to the hub; an outer roller rotatably mounted to the hub and adapted to receive the central roller; wherein the central roller is mounted centrally to the outer roller and the central roller is configured to contact a floor surface with the hub in a first orientation and the outer roller is configured to contact the floor surface with the hub in a second orientation. 19. The roller of claim 18, wherein the central roller defines a first height of the hub above the floor surface, and the outer roller defines a second height above the floor surface greater than the first height. 20. The roller of claim 18, wherein the central roller is spherical and the outer roller comprises an annular wheel. 21. The roller of claim 18, further in combination with a support base, wherein the hub is mounted to the support base. 22. The roller of claim 21, wherein the support base comprises an equipment base.