Patent ID: 8047556
Filing Date: 2011-11-01
Classification: A63C

Abstract:
1. A board capable of voluntary forward movement, the board comprising: a pair of front and rear boards, each of which is integrated with a connecting step formed on its lower surface and includes a connecting hole formed within the connecting step, a slope formed protrudedly at a lateral side of the connecting step and a slide-preventing cover being attached to an upper surface of the front and rear boards, the connecting holes being communicated with each other; a connecting assembly including a connecting pipe inserted into the connecting holes, fixing blocks rotatably coupled to both ends of the connecting pipe to integrally connect the front board and the rear board, each of the fixing blocks having a track groove, and coupling pins inserted into the track grooves through the connecting pipe to be in association with the connecting pipe so that the front and rear boards are rotated within limited angle ranges corresponding to predetermined widths of the track grooves; and voluntary advancement assemblies, each of which includes a steering means having a steering block and rotatably mounted to the slope formed at a lower side of the corresponding board so as to be inclined toward the rear of the pair of boards, a main steering shaft provided with an elastic member and coupled to the steering block, both ends of the elastic member being fixed to the corresponding board and the steering means, respectively, and a pair of caster means, which are installed to face each other at both sides of the steering means, capable of being steered and rolled by means of bearings provided at both sides of the steering means so that a twisting force of the elastic member generated from rolling of the pair of boards allows the pairs of caster means to be elastically moved forward in an alternating manner while the pairs of caster means are disaligned; and said steering block having a coupling hole formed at its center, a coupling groove in a multiple step shape formed at an end portion of the coupling hole to be communicated with the coupling hole, and a rotation-preventing recess partially protruded from an inner circumference of the coupling groove toward the outside of the coupling groove; said main steering shaft accommodating the elastic member in a perpendicular downward position so as to allow upper and lower portions of the elastic member to be partially exposed to the outside; a twist cover coupled with the lower portion of the elastic member exposed to the outside and fixed to the coupling groove of the steering block; and a fixing means for securing the main steering shaft to the corresponding board through the slope.