Patent ID: 7508372

Claim:
A control device comprising: a roller configured to rotate and tilt; a roller support coupled to the roller, wherein the roller is configured to rotate relative to the roller support; the first hinge disposed adjacent to a first end of the roller support; a second hinge disposed adjacent to a second end of the roller support, wherein the first end and the second end are substantially opposite ends of the roller support, the second hinge is above the first hinge, and the first hinge and the second hinge are configured to provide tilting support for the roller and roller support; a ratchet support having a hole formed therein, wherein at least a portion of the ratchet support is positioned in a central hole formed in the roller, and wherein the roller is configured to rotate relative to the ratchet support; a spring device positioned in the hole; and a ratchet ball coupled to the spring, wherein the spring is configured to push the ratchet ball outward from the hole to couple the ratchet ball to a set of protrusions positioned on an inner surface of the central hole, and wherein the ratchet ball and the protrusions are configured to ratchet if the roller is rotated.