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A joint for collapsible rails of a playpen includes a joint pivoting the inner ends of a pair of identical parts of the rail. The parts each has a pair of retractable projection of a V-shaped spring plate releasibly engaged into an aligned thru hole of the joint for the enabling or unabling the rota

A joint for collapsible rails of a playpen includes a joint pivoting the inner ends of a pair of identical parts of the rail. The parts each has a pair of retractable projection of a V-shaped spring plate releasibly engaged into an aligned thru hole of the joint for the enabling or unabling the rotations of the identical parts of the rail. A slide is disposed into the joint central the reduced ends of the V-shaped spring plate to permit the engagement and/or disengagement of the above projection with aligned thru hole in order to readily provide collapsing or flattening the playpen upon only one application of the slide.

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1. A joint assembly for a collapsible playpen, the assembly comprising:a joint including a hollow body of inverse U-shaped section, a pair of first notches at a top of the body and adjacent each of two ends thereof, a pair of first aligned thru holes below the first notches respectively, a pair of p

1. A joint assembly for a collapsible playpen, the assembly comprising:a joint including a hollow body of inverse U-shaped section, a pair of first notches at a top of the body and adjacent each of two ends thereof, a pair of first aligned thru holes below the first notches respectively, a pair of positioning rods secured below the first aligned thru holes respectively, each extending transversely across the hollow body, a pair of second aligned thru holes formed spaced apart in an upper center of the hollow body, a first aligned oblong hole vertically formed in a center of the body below the second aligned thru holes, a third aligned thru hole in a center of the body below the first aligned oblong hole, a pair of second notches centrally formed in lower end of the body below the third aligned thru hole and a pair of rectangular openings centrally formed spaced a part in an arcuate portion on a top of the body between the first notches; a pair of rods which comprise a rail of the playpen each including a tubular body, a first end pivoted to a respective corner member on top of the playpen and a second end having a fourth aligned thru hole adjacent the second end and a fifth aligned thru hole positioned in the proximity of the fourth aligned thru hole for pivoting the rods to the hollow body of the joint by a first axial pin extending through the first aligned thru holes of the body; a pair of V-shaped spring plates inserted into the second end of each of the rods and each including a third notch at the peak of the `V' for engaging the first axial pin, a pair of reduced ends each having a sloped surface and a pair of projections extending outward from outer surfaces of the respective plates and adjacent the reduced ends and for extending through of the fourth aligned thru holes and snapping up into the second aligned thru holes of the hollow body; a slide including a U-shaped body having a pair of ax-shaped lateral plates each comprising a beveled top end, a hook on an inner side beneath the beveled top end, a sixth aligned thru hole centrally formed in an upper portion and being engageable with the first aligned oblong hole and secured by a second axial pin through the first aligned oblong hole, and a second aligned vertical oblong hole centrally formed in a lower portion and being engageable with the third aligned hole and slidably secured by a third axial pin therethrough; a coil spring having pair of hooks at two ends respectively for hooking the second and third axial pin; whereby the slide is vertically slidable in the hollow body of the joint and returnable by the resilience of the coil spring.