Foldable playpen

Abstract

A foldable playpen includes four top fence assemblies, four side fence assemblies and a bottom frame assembly, the first end of each bottom frame rail being movably attached to the bottom frame foldable connector; an operating device for engaging the four top fence joint assemblies with the bottom frame foldable connector; four operating ropes, each operating rope having a first end and a second end, for enabling the top fence rails and the bottom frame rails to respond to a movement of the bottom frame foldable connector so as to switch the foldable playpen to a folded state from an open state, the first end of an operating rope is connected to a top fence joint assembly, and the second end of an operating rope is connected to the bottom frame foldable connector. The playpen can synchronously fold the bottom frame rails and the top fence rails, and is safe and reliable.

1 . A foldable playpen comprising:
 a bottom frame assembly with a bottom frame foldable connector, four bottom frame rails, each bottom frame rail having a first end and a second end, the first end of each bottom frame rail being movably attached to the bottom frame foldable connector, the second end of each bottom frame rail being attached to a foot support;   four top fence assemblies, each top fence assembly having a first top fence rail, a second top fence rail and a top fence joint assembly;   four side fence assemblies, each side fence assembly having a side fence; and   four vertical supports, each vertical support having an upper end and a lower end, the upper end of each vertical support being connected to the first top fence rail of a top fence assembly and the second top fence rail of an adjacent top fence assembly, the lower end of each vertical support being connected to a foot support;   an operating device for engaging the four top fence joint assemblies with the bottom frame foldable connector;   four operating ropes, each operating rope having a first end and a second end, for enabling the top fence rails and the bottom frame rails to respond to a movement of the bottom frame foldable connector so as to switch the foldable playpen to a folded state from an open state,   wherein   the first end of an operating rope is connected to a top fence joint assembly, and the second end of an operating rope is connected to the bottom frame foldable connector.   
     
     
         2 . The playpen of  claim 1 , further comprising a fabric cover covering four side fence assemblies, the fabric cover has four threading passages for four operating rope to pass through. 
     
     
         3 . The playpen of  claim 2 , wherein the bottom frame foldable connector further comprises a mounting base and four unlocking devices,
 the mounting base has an outer base having a chamber, an outer wall, an inner wall, and an inner base slidably disposed in the chamber, the four bottom frame rails are hinged to the outer base, the first ends of the bottom frame rails are pivotally connected with the inner base by a connecting member;   each unlocking device has a first unlocking member with an upper end and a lower end and a second unlocking member for activating the first unlocking member;   the first unlocking member is rotatably connected to the outer base by a first pin, and the second end of each operating rope is fixedly connected to the upper end of the first unlocking member;   a middle portion of the second unlocking member is rotatably connected to the inner base by a second pin, a first torsional spring for restoring is sleeved outside the second pin;   an oscillating arm, used for driving the lower end of the first unlocking member to act in a folding-unfolding process so as to cause the first unlocking member to rotate around the first pin and to drive the operating rope to act, is provided at one end of the second unlocking member;   each operating rope further comprises a cord disposed inside a jacket, and an end of the cord is connected to the upper end of the first unlocking member and an end of the jacket rests against the outer wall of the outer base.   
     
     
         4 . The playpen of  claim 3 , wherein the playpen further comprises an unlocking protection device with an oscillating member disposed in the chamber and rotatable connected to the bottom of the inner base through a third pin, and a neck for clamping one end of the oscillating member is provided on the inner wall of the outer base, and a second torsional spring for restoring is disposed out of the third pin. 
     
     
         5 . The playpen of  claim 4 , wherein the unlocking protection device further comprises an upper base, a connecting base mounted between the upper base and the inner base, and an unlocking rope with an upper end and a lower end;
 a lower end of the connecting base is connected to the inner base;   a slotted hole is defined on the connecting base in an axial direction, and the upper base passes through the slotted hole from a mounting shaft and is connected to the inner base;   the upper end of the unlocking rope is fixed on the mounting shaft and the lower end thereof is fixed on the oscillating member.   
     
     
         6 . The playpen of  claim 1 , further comprising a connecting base for rotatably connecting the first top fence rail and the second top fence rail of each top fence assembly;
 a fence joint assembly, for the first top fence rail and the second top fence rail to change from a vertically folded state to a horizontal state, is connected between the first top fence rail and the second top fence rail;   the fence joint assembly comprises a first crank with two ends and a middle portion, a second crank with two ends and a middle portion, and a restoring spring with an upper end and a lower end sleeved on the periphery of the operating rope;   a first end of the first crank rests against the first top fence rail and the middle portion thereof is rotationally connected to the connecting base by a first rotating shaft;   a first end of the second crank rests against the second top fence rail and the middle portion thereof is rotationally connected to the connecting base by a second rotating shaft;   a second end of the first crank is hinged to a second end of the second crank by a guide pin;   each operating rope is fixedly connected to the guide pin and used for driving the guide pin to slide in vertical direction;   each operating rope comprises a cord disposed inside a jacket, an end of the cord is fixedly connected to the guide pin, and an end of the jacket is resisted against a bottom wall of a pedestal on the bottom of the connecting base.   
     
     
         7 . The playpen of  claim 6 , wherein a vertically-arranged connecting rod, having a hollow through cavity, is fixedly mounted on the guide pin;
 a spring is sleeved on the periphery of the connecting rod, with an upper end of the spring being rested against the connecting rod and a lower end of the spring being rested against the upper end of the pedestal.   
     
     
         8 . The playpen of  claim 6 , wherein a fourth pin, on which a first roller is sleeved, is sleeved at one end of the first crank, and a first arc-shaped groove resisted against the first roller is disposed at an end of the first top fence rail;
 a fifth pin, on which a second roller is sleeved, is sleeved at one end of the second crank, and a second arc-shaped groove resisted against the second roller is disposed at an end of the second top fence rail.   
     
     
         9 . The playpen of anyone of  claim 1  and  claim 3 , wherein four auxiliary bottom frame rails are provided in parallel on lower portions of the four bottom frame rails, and one end of each auxiliary bottom frame rail is hinged to the outer base and the other end thereof is hinged to the feet of the playpen.