Patent ID: 6923459

Claim:
A 3-wheel vehicle board comprising: a pair of handle bars provided in the upper end thereof; a handle bar shaft with the lower end of which a front wheel is rotatably combined; a second hollow shaft with which the handle bar shaft is slidably combined; a first hollow shaft with which the second hollow shaft is rotatably combined; a locking/unlocking unit for fixing and releasing position of the handle bar shaft with respect to the second hollow shaft; a fixing block which is fixed to the lower end of the first hollow shaft; first and second rotatable links with each one end of which each one end of the fixing block is rotatably combined; a connection block with each one end of which the respective middle portions of the first and second rotatable links are rotatably combined, and with the middle portion of which the fixing block is rotatably combined; first and second foothold links which are rotatably combined with each one end of the first and second rotatable links with a hinge pin and on each one end of which each foothold and each rear wheel are provided; and a clamping unit which fixes the first and second foothold links horizontally and vertically with respect to the first and second rotatable links, wherein the clamping unit includes locking pin blocks penetratively coupled with the first and second foothold links and the first and second rotatable links, respectively, and the locking pin blocks each comprises a hollow body having a coupling hole with which a fixing ball is coupled in and out, an operational rod having a recess into which the fixing ball is inserted so as to be slidably coupled with the hollow body, and a spring elastically biasing the operational rod in one direction with respect to the hollow body, wherein a handle bar fixing unit is fixed to the upper end of the handle bar shaft in which a plurality of throughholes through which the handle bars are attachably and detachably coupled are formed on both ends of the handle bar fixing unit, wherein each handle bar is bent on the one end of which a coupling portion coupled with the handle bar fixing unit is formed and on the other end of which a handle bar grip portion is formed, and wherein locking protrusions coupled with the throughholes in the handle bar fixing unit are coupled in and out with the handle bar coupling portion.