This creation is a kind of two-period form accessory bonding mechanism, folds seat outside seat and two comprising folding in an assistive device body, two, folds in two and fold seat all two-by-two with respect to two end of position what assistive device body outside seat and two. Plural scroll wheel is equipped on seat in each interior fold, and it is folded outside two and is equipped with an at least scroll wheel on seat, and a binding yarn is wrapped in and folds those scroll wheel Hous for folding seat outside seat and two in two to two outside extensions for user's operation, thereby the scaling operation of binding yarn, which enables, folds seat first close to Hou in two, seat is folded in allowing again and folds that seat is close to each other outside, reaches two sections of purposes for tightening accessory.本創作是一種二段式輔具束緊機構，包含一輔具本體、二內收合座及二外收合座，二內收合座及二外收合座皆兩兩相對位於輔具本體二端。在各內收合座上設有複數滾動輪，且在二外收合座上設有至少一滾動輪，而一束繩纏繞在二內收合座及二外收合座的該些滾動輪後向二外側延伸供使用者操作，藉此束繩的伸縮操作令二內收合座先靠近後，再讓內收合座與外收合座彼此靠近，達成二段收緊輔具之目的。
