A retractable ramp mechanism of a welcab includes a position base, a ramp board, a linkage rod assembly, a damper and two adjuster. One end of the linkage rod assembly is connected to the position base and includes a first rod and a second rod. One end of the first rod is pivotally connected to the position base, the other end is pivotally connected to one end of the second rod. One end of the damper is connected to the position base, the other end is pivotally connected to the first rod. The two adjusters are disposed at two sides of the ramp board, and one of the adjusters is pivotally connected to one end of the second rod. Each of the adjusters is further connected to a driving cable to control the ramp board to move simultaneously, so when retracting the ramp board, motions are consistent and 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。100‧‧‧坡道收放機構110‧‧‧定位座120‧‧‧坡道板130‧‧‧連桿組件132‧‧‧第一連桿134‧‧‧第二連桿140‧‧‧傳動線150‧‧‧阻尼器152‧‧‧活塞桿154‧‧‧壓缸170‧‧‧主仰臥組件180‧‧‧從仰臥組件
