Patent ID: 7967684

Claim:
A universal joint, comprising: (a) a first structure having a rotational first primary axis and rotational first secondary axis, both intersecting and being perpendicular; said first structure further having two first facing surface areas created by a sweep of two first Bézier curves around said first primary axis, said two first Bézier curves and said first primary axis being coplanar, and (b) a second structure having a rotational second primary axis and a rotational second secondary axis, both intersecting and being perpendicular; said second structure further having two second facing surface areas created by a sweep of two second Bézier curves around said second primary axis, said two second Bézier curves and second primary axis being coplanar; said first structure interfaced with said second structure by force having said first primary axis perpendicular but not coplanar to said second primary axis, having said two first facing surface areas contact said two second facing surface areas in exactly four points, and said first secondary axis and said second secondary axis being coplanar, whereby both said first structure and said second structure can each be rotated around said first primary axis and second primary axis while transmitting rotary motion between said first secondary axis and said second secondary axis, and whereby said first structure can be stationary thereby restricting the freedom of motion of said second structure to rotation around said first primary axis and said second primary axis, and whereby the interface between said first structure and said second structure is non-permanently engaged by force only, and whereby said first primary axis and said second primary axis self align perpendicularly when said first structure and said second structure are engaged, and whereby said first secondary axis and said second secondary axis self align to be coplanar when said first structure and said second structure are engaged, and whereby the interface between said first structure and said second structure consists of exactly four points of contact established by force only.