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A turning mechanism for skateboards includes a plate fixed to the underside of the board and a wheel frame is pivotably connected to the pivot tube on the plate. A first part extends through a lug on the plate and a second part is threadedly connected to the first part. A U-shaped first restriction

A turning mechanism for skateboards includes a plate fixed to the underside of the board and a wheel frame is pivotably connected to the pivot tube on the plate. A first part extends through a lug on the plate and a second part is threadedly connected to the first part. A U-shaped first restriction member extends through a spring and is connected to the second part, and two hook ends of the first restriction member are hooked to a first end of the spring. A U-shaped second restriction member extends through the spring and is connected to a rod on the wheel frame. Two hook ends of the second restriction member are hooked to a second end of the spring. The second part moves linearly to pull the spring when rotating the first part so as to restrict the required force that the wheel frame is pivoted relative to the pivot tube.

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1. 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 f

1. 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, andan 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. 2. The turning mechanism as claimed in claim 1, wherein a buffering ring is located between the first part and the plate. 3. The turning mechanism as claimed in claim 2, wherein the rod includes a groove defined in an outer periphery of a distal end thereof and the U-shaped portion of the second restriction member is engaged with the groove. 4. The turning mechanism as claimed in claim 3, wherein a collar is engaged with the groove of the rod and includes an annular groove defined in an outer periphery thereof, the U-shaped portion of the second restriction member is engaged with the annular groove. 5. The turning mechanism as claimed in claim 3, wherein a stop extends axially from the pivot portion so as to restrict an angle that the wheel frame turns relative to the plate. 6. The turning mechanism as claimed in claim 1, wherein the operation portion is a slot. 7. 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, andan adjustment unit including a first part, a second part and a spring, the second part extending through the through hole and the first part threadedly connected to the second 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 the operation portion including an inner threaded hole, 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. 8. The turning mechanism as claimed in claim 7, wherein a buffering ring is located between the first part and the plate. 9. The turning mechanism as claimed in claim 8, wherein the rod includes a groove defined in an outer periphery of a distal end thereof and the U-shaped portion of the second restriction member is engaged with the groove. 10. The turning mechanism as claimed in claim 9, wherein a collar is engaged with the groove of the rod and includes an annular groove defined in an outer periphery thereof, the U-shaped portion of the second restriction member is engaged with the annular groove. 11. The turning mechanism as claimed in claim 9, wherein a stop extends axially from the pivot portion so as to restrict an angle that the wheel frame turns relative to the plate. 12. The turning mechanism as claimed in claim 7, wherein the operation portion is a locking nut. 13. 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, andan adjustment unit including a first part, a second part and a spring, the second part extending through the through hole and the first part threadedly connected to the second part, a U-shaped restriction member extending through the spring and two hook ends of the restriction member being hooked to an end of the spring, a U-shaped portion of the second restriction member being engaged with the rod on the extension, the first part including an operation portion at a first end thereof and the operation portion including an inner threaded hole, the second part having outer threads which are threadedly connected with the inner threaded hole of the first part, the second part including a flange at an end thereof and the other end of the spring contacting the flange, the second part moving linearly when rotating the first part so as to change a length of the spring. 14. The turning mechanism as claimed in claim 13, wherein a buffering ring is located between the first part and the plate. 15. The turning mechanism as claimed in claim 14, wherein the rod includes a groove defined in an outer periphery of a distal end thereof and the U-shaped portion of the second restriction member is engaged with the groove. 16. The turning mechanism as claimed in claim 15, wherein a collar is engaged with the groove of the rod and includes an annular groove defined in an outer periphery thereof, the U-shaped portion of the second restriction member is engaged with the annular groove. 17. The turning mechanism as claimed in claim 15, wherein a stop extends axially from the pivot portion so as to restrict an angle that the wheel frame turns relative to the plate. 18. The turning mechanism as claimed in claim 13, wherein the operation portion is a slot. 19. The turning mechanism as claimed in claim 13, wherein the flange includes a recess defined in a surface thereof and the spring is engaged with the recess.