Foldable child enclosure

A child enclosure comprising:

• a side structure having a plurality of side posts, each side post having
• walls forming an internal space with an elongated guide surface, and a slot formed along at least one of the walls and extending along the elongated internal guide space,
• a rack assembly movably coupled to the side post,
• a push rod disposed within the internal space and coupled to the rack assembly for effecting a linear driving motion to reciprocate the rack assembly within the internal space, and
• a drive link pivotally coupled to the rack assembly and extending through the slot;
• and
• an upper assembly having upper arms, each upper arm being pivotally coupled to a respective side post and pivotally coupled to a respective drive link wherein, reciprocation of the rack assembly within the frame effects, through the respective drive link, folding and unfolding of the upper arm relative to the respective side post.