Patent ID: 8246058

Claim:
A turning mechanism for skateboards, comprising: a plate having a lug extending from a surface thereof and a through hole defined through the lug, a pivot tube extending from the surface of the plate at an angle and including an axial hole defined through the pivot tube, the plate adapted to be fixed to a board, an axle extending through the axial hole in pivot tube and connected to a wheel frame, the wheel frame including a pivot portion which is located corresponding to the pivot tube, a passage defined axially through the pivot portion, an extension extending from the pivot portion and two shafts extending from two sides of the extension, the two shafts adapted to be connected with two wheels, a rod extending from a surface of the extension, a common axis of the two shafts located at a distance from the pivot tube, and an adjustment unit including a first part, a second part and a spring, the first part extending through the through hole and the second part threadedly connected to the first part, the second part including an aperture, a U-shaped first restriction member extending through the spring and the aperture and two hook ends of the first restriction member being hooked to a first end of the spring, a U-shaped second restriction member extending through the spring and two hook ends of the second restriction member being hooked to a second end of the spring, a U-shaped portion of the second restriction member engaged with the rod on the extension, the first part including an operation portion at a first end thereof and a shank extending from the operation portion, an inner threaded hole defined in a second end of the first part, the second part having outer threads which are threadedly connected with the inner threaded hole of the first part, a U-shaped portion of the first restriction member extending through the aperture of the second part which moves linearly when rotating the first part so as to change a length of the spring.