Folding mechanism

A folding mechanism, comprising:

• at least one first retractable folding assembly, including:
• a first base member, having a first end and an opposing second end in a longitudinal direction thereof, further defining a first lateral side and an opposing second lateral side to opposing sides thereof in the longitudinal direction;
• two friction members, mounted respectively to the first end and the second end;
• two first dual-pivotal plate units, symmetrically pivotally connected with the first base member by closing to the first end and the second end, respectively;
• two first fixation plate units, pivotally connected individually with the corresponding first dual-pivotal plate units;
• and
• a first pulling member, mounted at the first base member to pull the first pulling member so as further to pull the first base member;
• and
• at least one second retractable folding assembly, including:
• a second base member, having a third end and an opposing fourth end in a longitudinal direction thereof, further defining a third lateral side and an opposing fourth lateral side to opposing sides thereof in the longitudinal direction;
• two second dual-pivotal plate units, symmetrically pivotally connected with the second base member by closing to the third end and the fourth end, respectively;
• two second fixation plate units, pivotally connected individually with the corresponding second dual-pivotal plate units;
• and
• a movable buckle unit for buckling or releasing springily the two second dual-pivotal plate units.