Foldable bed

Abstract

A foldable bed includes a front right extensible rod, rear right extensible rod, front left extensible rod, rear left extensible rod, front support portion, front support bottom base, rear central extensible rod, bridge-shaped link member, first front right oblique rod, second front right oblique rod, first rear right oblique rod, second rear right oblique rod, first front left oblique rod, second front left oblique rod, first rear left oblique rod, second rear left oblique rod, two rear oblique rods, two front oblique rods, two front slide rods, front connecting rod, rear connecting rod and sheet-like element. Therefore, the foldable bed is compact and easy to fold.

What is claimed is: 
     
         1 . A foldable bed, comprising: a front right extensible rod, a rear right extensible rod, a front left extensible rod, a rear left extensible rod, a front support portion, a front support bottom base, a rear central extensible rod, a bridge-shaped link member, a first front right oblique rod, a second front right oblique rod, a first rear right oblique rod, a second rear right oblique rod, a first front left oblique rod, a second front left oblique rod, a first rear left oblique rod, a second rear left oblique rod, two rear oblique rods, two front oblique rods, two front slide rods, a front connecting rod, a rear connecting rod and a sheet-like element,
 wherein the front right extensible rod, the rear right extensible rod, the front left extensible rod and the rear left extensible rod are disposed at four vertices of a rectangle, respectively, such that the front support portion and the front support bottom base are disposed between the front right extensible rod and the front left extensible rod, with the front support portion disposed above the front support bottom base, with the rear central extensible rod disposed between the rear right extensible rod and the rear left extensible rod,   wherein two ends of the first front right oblique rod pivotally connect to a top end of the front right extensible rod and a bottom end of the rear right extensible rod, respectively, two ends of the second front right oblique rod each movably connect to the front right extensible rod and pivotally connect to the front support bottom base, two ends of the first front left oblique rod pivotally connect to the top end of the front left extensible rod and a bottom end of the rear left extensible rod, respectively, two ends of the second front left oblique rod each movably connect to the front left extensible rod and pivotally connect to the front support bottom base,   wherein two ends of the first rear right oblique rod pivotally connect to the bottom end of the front right extensible rod and the top end of the rear right extensible rod, respectively, two ends of the second rear right oblique rod pivotally connect to the bottom end of the rear central extensible rod and movably connect to the rear right extensible rod, respectively, two ends of the first rear left oblique rod pivotally connect to the bottom end of the front left extensible rod and the top end of the rear left extensible rod, respectively, and two ends of the second rear left oblique rod pivotally connect to the bottom end of the rear central extensible rod and movably connect to the rear left extensible rod, respectively,   wherein two ends of the two rear oblique rods pivotally connect to the top end of the rear central extensible rod and the bottom end of the rear right extensible rod, respectively, and pivotally connect to the top end of the rear central extensible rod and the bottom end of the rear left extensible rod, respectively,   wherein two ends of the two front oblique rods pivotally connect to the front support portion and the bottom end of the front right extensible rod, respectively, and pivotally connect to the front support portion and the bottom end of the front left extensible rod,   wherein the two front slide rods have their one ends pivotally connected to upper portions of the two front oblique rods and their other ends slidably connected to the second front right oblique rod and the second front left oblique rod, respectively, wherein two ends of the bridge-shaped link member pivotally connect to the front support bottom base and the bottom end of the rear central extensible rod, respectively, the bridge-shaped link member is pivotally rotatable about a center thereof, the bridge-shaped link member has a front pivotal connection point and a rear pivotal connection point, with the front and rear pivotal connection points, lying in front of the center and at rear of the center, respectively, such that two ends of the front connecting rod pivotally connect to the front pivotal connection point and the front support portion, respectively, and two ends of the rear connecting rod pivotally connect to the rear pivotal connection point and movably connect to the rear central extensible rod, respectively,   wherein the sheet-like element is held by the top end of the front right extensible rod, the top end of the rear right extensible rod, the top end of the front left extensible rod, the top end of the rear left extensible rod, the top end of the rear central extensible rod and a top portion of the front support portion.   
     
     
         2 . The foldable bed of  claim 1 , wherein an outer rod of the front right extensible rod is disposed above an inner rod of the front right extensible rod, an outer rod of the rear right extensible rod is disposed above an inner rod of the rear right extensible rod, an outer rod of the front left extensible rod is disposed above an inner rod of the front left extensible rod, an outer rod of the rear left extensible rod is disposed above an inner rod of the rear left extensible rod, and an outer rod of the rear central extensible rod is disposed above an inner rod of the rear central extensible rod. 
     
     
         3 . The foldable bed of  claim 2 , wherein the second front right oblique rod movably connect to an outer rod of the front right extensible rod, the second front left oblique rod movably connect to an outer rod of the front left extensible rod, the second rear right oblique rod movably connect to an outer rod of the rear right extensible rod, the second rear left oblique rod movably connect to an outer rod of the rear right extensible rod, and the rear connecting rod movably connect to an outer rod of the rear central extensible rod. 
     
     
         4 . The foldable bed of  claim 1 , wherein the first front right oblique rod and the first rear right oblique rod cross each other and pivotally connect to each other, the first front left oblique rod and the first rear left oblique rod cross each other and pivotally connect to each other, the second front right oblique rod and the front oblique rod cross each other and pivotally connect to each other, the second front left oblique rod and the front oblique rod cross each other and pivotally connect to each other, the second front left oblique rod and the front oblique rod cross each other and pivotally connect to each other, the second rear right oblique rod and the rear oblique rod cross each other and pivotally connect to each other, the second rear left oblique rod and the rear oblique rod cross each other and pivotally connect to each other. 
     
     
         5 . The foldable bed of  claim 1 , further comprising a basal bottom element disposed at the bottom of the sheet-like element, the top end of the second front right oblique rod, the top end of the rear right extensible rod, the top end of the second front left oblique rod, the top end of the rear left extensible rod, the top end of the rear connecting rod, and the top portion of the front support portion to support the sheet-like element. 
     
     
         6 . The foldable bed of  claim 5 , further comprising two support elements disposed at an outer rod of the rear right extensible rod and an outer rod of the rear left extensible rod, respectively, to support the basal bottom element. 
     
     
         7 . The foldable bed of  claim 1 , further comprising a winding element with an end connected to one of the front right extensible rod, the rear right extensible rod, the front left extensible rod, the rear left extensible rod and the rear central extensible rod. 
     
     
         8 . The foldable bed of  claim 1 , wherein, when the foldable bed is unfolded, the top portion of the front support portion is lower than a top end of the front right extensible rod, a top end of the rear right extensible rod, a top end of the front left extensible rod, a top end of the rear left extensible rod, and a top end of the rear central extensible rod.