Patent ID: 7874786

Claim:
A disc turning method comprising the steps of: establishing a pivot and a guide surface spaced therefrom; establishing an initial position above the pivot in a gravity direction which is vertical to the pivot; placing a disc body in the initial position and releasing the disc body to make it free fall from the initial position to the pivot wherein the disc body is supported off-center on the pivot and an edge portion of the disc body slidably engages the guide surface; tipping the disc body under the downward action of gravity from the tipping position along a turning path, the edge portion maintaining slidable engagement of the guide surface over at least an initial part of the turning path; and finishing a turn operation, whereby the disc body displaces along the turning path to be reoriented by substantially 180 degrees relative to the initial position; and reorientating by 180 degrees as the disc body is traversing in the gravity direction.