Patent ID: 8584592

Claim:
A guiding device, comprising: a track assembly comprising a straight track, an interconnecting track, and an arc track, the straight track comprising a first straight contact surface and a second straight contact surface on opposite sides, the arc track comprising a first arc contact surface and a second arc contact surface on opposite sides which are concentric, the interconnecting track comprising a third arc contact surface and a variable-curvatured contact surface on opposite sides, wherein the third arc contact surface of the interconnecting track and the first arc contact surface of the arc track are the same in curvature, the third arc contact surface links the first straight contact surface and the first arc contact surface, and the variable-curvatured contact surface links the second straight contact surface and the second arc contact surface; a moving body spanning the track assembly; and a rolling unit composed of a first rolling member, a second rolling member, and a third rolling member, the first and the second rolling members normally rolling and coupling between the moving body and the track assembly on a side where the third arc contact surface is located, while the third rolling member normally rolling and coupling between the moving body and the track assembly on a side where the variable-curvatured contact surface is located; wherein the moving body moves along the track assembly only through the rolling unit.