A kind of ramp jack of happiness vehicle, including a positioning seat, a ramp plate, a link assembly, a damper and two lie on the back component. Link assembly one end connects what positioning seat and includes a first connecting rod and a second connecting rod. First connecting rod one end is pivotally connected what positioning seat, and the other end is then pivotally connected with one end of second connecting rod. Damper one end is pivotally connected what positioning seat, and the other end is pivotally connected what first connecting rod. What ramp plate two sides are respectively set in component of respectively lying on the back, one end pivot joint of lie on the back component and the second connecting rod of one, and component of respectively lying on the back be also connected with one can synchronously control ramp plate actuation drive line, make ramp plate during folding, can achieve the effect that action consistency and more labor-saving.一種福祉車的坡道收放機構，包括一定位座、一坡道板、一連桿組件、一阻尼器及二仰臥組件。連桿組件一端連接於定位座且包含一第一連桿及一第二連桿。第一連桿一端樞接於定位座，另一端則與第二連桿的一端樞接。阻尼器一端樞接於定位座，另一端樞接於第一連桿。各仰臥組件分別設置於坡道板兩側，其一的仰臥組件與第二連桿的一端樞接，且各仰臥組件還連接一可同步控制坡道板作動的傳動線，使坡道板在收合過程中，能夠達到動作一致性且更省力的效果。
