Folding joint for a foldable playyard

A folding joint comprising a base frame having an inner receiving space, two connecting members respectively pivotally held at two different locations within said inner receiving space, said connecting members respectively holding two cylindrical rails and arranged within said inner receiving space for permitting said rails to be held in a longitudinally aligned position relative to each other and folded up into a collapsed position,

• said connecting members each having an axial hole at one end thereof for receiving either said rail, opposite side walls respectively having first and second circular through holes, and a track connecting said first and second through holes through said axial hole;
• and
• said rails each having a connecting end inserted into said axial hole, said connecting end having a pin hole arranged in a transverse direction relative to said axial hole and a headed pin received in said pin hole, said headed pin having a terminal end flush with an outer wall surface of said connecting end and a head protruding out of said outer wall surface of said connecting end,
• wherein one of said first and second through holes has an inner diameter approximately equal to a width of said track for passing said headed pin therethrough, and said connecting end rotates through said track permitting said head of said headed pin to be stopped at said first through hole when said rails are held in said longitudinally aligned position and at said second through hole when said rails are folded up into said collapsed position.