Skateboard capable of all-direction running

Abstract

A skateboard including: a central rod unit; a first footplate installed to an end of the central rod unit to be rotatable on a vertical axis; a plurality of first casters installed to be rotatable, independent from the first footplate; a second footplate installed to another end of the central rod unit to be rotatable on another vertical axis; and a plurality of second casters installed to be rotatable, independent from the second footplate. A user may move forwards and backwards by putting both legs on footplates and walking forward and by alternating the both leg forward and backward. Also, since the first and second casters may independently rotate, rotating 360 degrees in place may be performed.

1 . A skateboard comprising:
 a central rod unit;   a first footplate installed to an end of the central rod unit to be rotatable on a vertical axis;   a plurality of first casters installed to be independently rotatable on the first footplate;   a second footplate installed to another end of the central rod unit to be rotatable on another vertical axis; and   a plurality of second casters installed to be independently rotatable on the second footplate.   
     
     
         2 . The skateboard of  claim 1 , wherein the central rod unit is formed in a duplex structure capable of expanding and contracting lengthwise. 
     
     
         3 . The skateboard of  claim 2 , wherein the central rod unit comprises:
 a central hollow cylinder;   two slide rods contained by both ends of the central hollow cylinder and sliding lengthwise to the central hollow cylinder; and   a spring coupled with the slide rods to provide elasticity.   
     
     
         4 . The skateboard of  claim 1 , wherein the first and second footplates twist in a certain angle range around a longitudinal axis of the central rod unit and have a restoring force to return an original position against the twisting. 
     
     
         5 . The skateboard of  claim 4 , wherein:
 rotating joints are installed to the both ends of the central rod unit, the rotating joints having the restoring force against the twisting; and   the first and the second footplates are installed to each of the rotating joints to be rotatable on the vertical axis, respectively.   
     
     
         6 . The skateboard of  claim 1 , wherein the plurality of first casters and the second casters comprise:
 a footplate fixture installed on a bottom surface of the first and second footplate to be rotatable;   an elastic connecting portion connected to a bottom of the footplate fixture and bending in a predetermined range;   a wheel connecting portion connected to a bottom of the elastic connection portion; and   a caster wheel installed to the wheel connecting portion to be rotatable,   wherein the caster wheel rotates in a position biased against a pivot axis of the footplate fixture.   
     
     
         7 . The skateboard of  claim 6 , wherein the wheel connecting portion is installed on a bottom surface of the elastic connecting portion to be rotatable. 
     
     
         8 . The skateboard of  claim 1 , wherein the plurality of first casters and the plurality of second casters comprise:
 a footplate fixture installed on a bottom surface of the first or second footplate to be rotatable;   a connecting portion connected to a bottom of the footplate fixture to be rotatable;   a wheel connecting portion connected to a bottom of the connecting portion; and   a caster wheel installed to the wheel connecting portion to be rotatable,   wherein the caster wheel rotates in a position biased against a pivot axis of the footplate fixture.   
     
     
         9 . The skateboard of  claim 8 , wherein the wheel connecting portion is installed on a bottom surface of the connecting portion to be rotatable. 
     
     
         10 . The skateboard of  claim 1 , wherein the plurality of first casters and the plurality of second casters comprise:
 a footplate fixture installed on a bottom surface of the first or second footplate to be rotatable;   a wheel connecting portion connected to a bottom of the footplate fixture;   a caster wheel installed to the wheel connecting portion to be rotatable; and   a wheel brake provided adjacent to the caster wheel and generating resistance against driving according to an inclination of the footplate.   
     
     
         11 . The skateboard of  claim 1 , wherein a central footplate is installed on a top surface of the central rod unit. 
     
     
         12 . A skateboard comprising:
 a central rod unit;   two footplates installed to both ends of the central rod unit to be rotatable;   elastic supporters disposed at bottoms of the footplates, respectively, and including a suspension supporting a bottom surface of the footplates; and   a plurality of directional casters installed to the elastic supporters to be independently rotatable, respectively.   
     
     
         13 . The skateboard of  claim 12 , wherein:
 a rotating joint is installed on at least one of the both ends of the central rod unit, the rotating joint having a restoring force against a twist between the rotating joint and the central rod unit;   the footplate installed to the rotating joint rotates on a vertical axis and a horizontal axis; and   the footplate pivots to an up and a down or a right and a left with respect to the central rod unit.   
     
     
         14 . The skateboard of  claim 13 , wherein the rotating joint twists in both directions in a boundary angle range of less than 25 degrees with respect to a longitudinal axis of the central rod unit, pivots to an up and a down with respect to both directions in a boundary angle range of less than 20 degrees on the horizontal axis, and pivots right and left with respect to both directions in a boundary angle range of less than 90 degrees on the vertical axis. 
     
     
         15 . The skateboard of  claim 12 , wherein the central rod unit has a double pipe structure capable of expanding and contracting longitudinally, and includes a fixture for fixing a controlled length. 
     
     
         16 . The skateboard of  claim 12 , wherein the central rod unit has a double pipe structure capable of expanding and contracting longitudinally, in which a compression spring or a tension spring is installed for providing a restoring force against the expanding and contracting of the central rod unit. 
     
     
         17 . The skateboard of  claim 12 , wherein a wheel brake is installed to the directional caster, which is provided adjacent to a wheel and generates resistance against driving according to an inclination of the footplate. 
     
     
         18 . The skateboard of  claim 17 , wherein the wheel brake is connected to a top of the wheel to pivot at an angle of a certain degree. 
     
     
         19 . A skateboard comprising:
 a central rod unit formed in a double pipe structure capable of elastically expanding and contracting lengthwise;   two footplates installed on both ends of the central rod unit to pivot on a vertical axis and a horizontal axis, twisting in a certain boundary angle range on a longitudinal axis of the central rod unit, and having a restoring force to return to an original position against the pivoting on the horizontal axis and vertical axis, and the twisting; and   casters including at least one footplate fixture installed on a bottom surface of each of the footplates to be rotatable, an elastic connecting portion connected to a bottom of the footplate fixture and bending in a predetermined range, a wheel connecting portion installed on a bottom of the elastic connecting portion to be rotatable, and a caster wheel installed to the wheel connecting portion to be rotatable, the caster wheel rotating in a position biased against a pivot axis of the footplate fixture.   
     
     
         20 . The skateboard of  claim 19 , wherein the central rod unit comprises:
 a central hollow cylinder;   two slide rods contained by both ends of the central hollow cylinder and sliding lengthwise to the central hollow cylinder; and   a spring coupled with the slide rods to provide elasticity.   
     
     
         21 . The skateboard of  claim 19 , further comprising a wheel brake installed to a directional caster, which is provided adjacent to a wheel and generates resistance against driving according to an inclination of the footplate. 
     
     
         22 . The skateboard of  claim 19 , wherein a central footplate is installed on a top surface of the central rod unit. 
     
     
         23 . A skateboard comprising:
 a central rod unit formed in a double pipe structure capable of elastically expanding and contracting lengthwise;   two footplates installed on both ends of the central rod unit to pivot on a vertical axis and a horizontal axis, twisting in a certain boundary angle range on a longitudinal axis of the central rod unit, and having a restoring force against the pivoting on the horizontal axis and vertical axis, and the twisting to return to an original position; and   a plurality of casters including at least one footplate fixture installed on a bottom surface of each of the footplates to be rotatable, an inclination connecting portion connected to a bottom of the footplate fixture, the inclination connecting portion whose bottom surface is inclined, a wheel connecting portion installed on a bottom of the inclination connecting portion to be rotatable, and a caster wheel installed to the wheel connecting portion to be rotatable.