Collapsible playyard

A collapsible playyard capable of being expanded to a first position and folded to a second position, comprising:

• an upper frame, said upper frame being foldable and including a plurality of corner connecting parts, a plurality of pairs of upper frame member sections, and a plurality of first lock structures, wherein one end of each of said upper frame member sections is connected to a respective one of said corner connecting parts and the other end of each is connected to respective one of said first lock structures and every pair of said upper frame member sections are locked by a respective one of said first lock structures when said collapsible playyard is in the first position and released from said first lock structure when said collapsible playyard is in the second position;
• a lower frame, said lower frame including a collapsible frame, which can be changed between the first and second positions, and a second lock structure connected to said collapsible frame, wherein said collapsible frame comprises a pair of central frame members pivotably connected to said second lock structure, and said second lock structure comprises a U-shaped cover and a grasp handle connected to a base portion of said U-shaped cover;
• a plurality of supporting members connecting said corner connecting parts of said upper frame and the corner parts of said lower frame to form a cubic body frame;
• and
• a plurality of wall clothing members enclosing the bottom face and surrounding faces of said cubic body frame to form a confined space for an infant to play inside;
• further wherein said U-shaped cover includes two connecting portions each having a bulge located on an inside face there of, said bulges facing each other, each of said central frame members has a corresponding fillister, such that when said U-shaped cover is placed in a first direction, said bulges and said fillisters will be engaged causing said lower frame be locked in an expanded position, and when said U-shaped cover is placed in a second direction said bulges and fillisters disengage causing said lower frame to be unlocked.