Patent ID: 8408565

Claim:
A hinge structure of a skateboard comprising a hinge unit that fixes a front board and a rear board in a separated state and elastically restoring the front board and the rear board against twist and casters that are mounted on the bottoms of the front board and the rear board, the hinge unit (H) including: a first hinge housing ( 100 ) that is formed in the rear board (RB) and has a hollow portion ( 102 ) of which an end is opened to face the front board (FB); a second hinge housing ( 200 ) that is formed in the front board (FB) and has a hinge cylinder 202 of which an end is opened to face the rear board (RB); a hinge shaft ( 300 ) that is coupled to the first hinge housing ( 100 ) at one end and is coupled to the second hinge housing ( 200 ) with a bolt at the other end; at least one bearing (B) that is coupled to the hinge shaft ( 300 ); a fixed hinge cam ( 400 ) that is axially coupled to the hinge shaft ( 300 ) and one end of which is inserted into the hollow portion ( 102 ) of the first hinge housing ( 100 ) and the other end has a fixed contact portion 402 obliquely cut to form an elliptical shape; a movable hinge cam ( 500 ) that is axially coupled to the hinge shaft ( 300 ) and has a movable contact portion ( 502 ) having a shape corresponding to the fixed contact portion ( 402 ) of the fixed hinge cam ( 400 ), wherein the movable contact portion ( 502 ) rotates along the fixed contact portion ( 402 ) so as to be movable in the axial direction in the hinge cylinder ( 202 ) of the second hinge housing ( 200 ); a hinge spring ( 600 ) that is safely coupled to the inside of the hinge cylinder ( 202 ), is disposed between the movable hinge cam ( 500 ) and the hinge cylinder ( 202 ), and applies an elastic force to the movable hinge cam ( 500 ); and a fixing and coupling member ( 700 ) that is coupled to the ends of the front board (FB) and the rear board (RB) facing each other with a bolt so as to prevent the hinge shaft ( 300 ) from being departing from the first and second hinge housings ( 100 and 200 ).