| 摘要 |
A joint structure with a stable unlocked state for a foldable playpen, comprising a pair of upper rails, a rigid shroud, a pair of lock pins, a pair of spring biased pin-carriers, and a release actuator. The pair of upper rails each have a necked portion and a pushing element; the rigid shroud is pivotally connected between the pair of upper rails; the pair of spring biased pin-carriers is installed within the rigid shroud for carrying the pair of lock pins to engage with the necked portion, thereby locking the pair of upper rails in a use position and to leave the necked portion to release the pair of upper rails from the use position. The pair of spring biased pin-carriers are featuring with a side extension flap for abutting against the pushing element, and an associating short arm for keeping the pair of spring biased pin-carriers to rotate in an opposite directions simultaneously. The release actuator is operatively mounted on outside of the rigid shroud for driving the pair of spring biased pin-carriers to drive the pair of lock pins to disengage from the necked portion thereby releasing the pair of upper rails from the use position to rotate to a folded position.
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