Bending joint of a collapsible baby playing bed

In combination, a collapsible baby playing bed having upper frames and a bending joint for pivotally interconnecting two of said upper frames of said bed, wherein said bending joint comprising:

• two inner tooth members, wherein each of said two inner tooth members has a through hole, a tubular portion connected to one of said two upper frames of said bed, a holding chamber, and a plurality of teeth disposed inside said holding chamber;
• two fitting blocks, wherein each of said two fitting blocks has a plurality of teeth thereon for engaging with said teeth of the respective inner tooth member, a through hole, and two opposing sectorial recesses thereon;
• a connector having two sections, wherein each of said two connector sections has a pair of opposing sectorial projections thereon for engaging with said two opposing sectorial recesses of the respective fitting block, a through hole, a plurality of blocking trenches, and a recessed portion;
• two springs, wherein each of said two springs is disposed between and abuts one of said two connector sections and the respective fitting block;
• two bolts, wherein each of said two bolts passes through said through hole of the respective connector section, one of said two springs, said through hole of the respective fitting block, and said through hole of the respective inner tooth member;
• two nuts, wherein each of said two nuts screws onto an end of the respective bolt for securing together and retaining the respective connector section, said one of said springs, the respective fitting block, and the respective inner tooth member on the respective bolt to dispose said two inner tooth members adjacent to each other and to allow said two inner tooth members having the respective two upper frames attached thereto to pivot relative to each other;
• and
• a push cap having a plurality of blocking hooks, wherein said push cap fits on said recessed portions of said two connector sections and said plurality of blocking hooks engage said plurality of blocking trenches of said two connector sections to detain the push cap within said recessed portions of said connector sections.