Linear/helix movement support/solar tracker

1. A rotational support comprising:

a stationary cylinder firming the sole base of said support;

a rotational cylinder formed coaxial with said stationary cylinder about a first axis, the rotational cylinder axially abutting said stationary cylinder;

retaining means for preventing axial movement of said rotational cylinder relative to said stationary cylinder, the retaining means functioning solely between the stationary and rotational cylinders without any additional support;

an inner cylinder coaxial about the first axis, the inner cylinder extending axially between said stationary cylinder and said rotational cylinder, the inner cylinder engaging both the stationary and rotational cylinders;

wherein said inner cylinder, stationary cylinder and rotational cylinder have cam grooves and cam followers between the inner cylinder and the stationary and rotational cylinders, so that axial motion of the inner cylinder results in rotational motion of the rotational cylinder.

2. A rotational support as set forth in claim 1 wherein said support is a solar tracker.

3. A rotational support as set forth in claim 1 wherein said support has only one stationary cylinder.

4. A rotational support as set forth in claim 1 including a second axis perpendicular to said first axis.

5. A rotational support as set forth in claim 1 wherein said support is a robot.

6. A rotational support as set forth in claim 1 wherein said support is an exercise machine.

7. A rotational support as set forth in claim 1 wherein said retaining means is a retaining ring coupling abutting ends of said stationary cylinder and said rotational cylinder whereby contributing to the axial alignment of said stationary cylinder and said rotational cylinder and allowing rotational movement between said stationary cylinder and said rotational cylinder.

8. A rotational support as set forth in claim 1 wherein said inner cylinder is driven by an electric driving means.

9. A rotational support as set forth in claim 1 wherein said retaining means is a centrally located hollow cylinder providing an access hole through said support.

10. A rotational support as set forth in claim 1 wherein said retaining means is a centrally located solid cylinder.

11. A rotational support as set forth in claim 1 wherein said retaining means surrounds said stationary and rotational cylinders and is provided with access for a mount to be coupled to said stationary cylinder.

12. A rotational support as set forth in claim 1 wherein said retaining means is the weight of the rotational pipe and any structure attached to the rotational pipe.

13. A rotational support as set forth in claim 1 wherein said cam grooves and cam followers are male and female slidably engaged splined sleeves.

14. A rotational support as set forth in claim 1 wherein said inner cylinder is controlled by a fluid.

15. A rotational support as set forth in claim 1 wherein said retaining means is a centrally located cylinder with a rotationally enveloping cylinder which controls said inner cylinder by an electric driving means.