Foldable Chair

Abstract

A foldable chair includes a foldable frame and a reinforcing joint. The foldable frame includes a supporting frame and a seat frame pivotally connected with each other via the reinforcing joint, wherein the reinforcing joint includes a first joint member, a second joint member, and a connecting member connecting the second joint member with the first joint member. The first joint member, having an engaging cavity, is coupled at the seat frame. The second joint member is coupled at the supporting frame and is received at the engaging cavity to frictionally couple with the first joint member. The reinforcing joint serves as a supporting shaft to support between the supporting frame and the seat frame and serves as a rotatable shaft to enable the second joint member to be rotated at the first joint member for a pivotal movement between the supporting frame and the seat frame.

What is claimed is: 
     
         1 . A foldable chair, comprising:
 a foldable frame which comprises a supporting frame and a seat frame; and   at least one reinforcing joint for pivotally connecting said supporting frame with said seat frame, wherein said reinforcing joint comprises:   a first joint member, having an engaging cavity, coupled at said seat frame;   a second joint member coupled at said supporting frame and received at said engaging cavity to frictionally couple with said first joint member, wherein said first and second joint members serve as a supporting shaft to support between said supporting frame and said seat frame and serve as a rotatable shaft to enable said second joint member to be rotated at said first joint member for a pivotal movement between said supporting frame and said seat frame; and   a connecting member extended from said second joint member through said first joint member to ensure an engagement therebetween.   
     
     
         2 . The foldable chair, as recited in  claim 1 , wherein said first joint member has a tubular shape defining said engaging cavity therein, such that said second joint member is inserted into said engaging cavity at a position that an outer circumferential surface of said second joint member is frictionally engaged with an inner circumferential surface of said engaging cavity. 
     
     
         3 . The foldable chair, as recited in  claim 2 , wherein said engaging cavity is a conical cavity and said second joint member has a corresponding conical shape to enlarge a frictional contacting area between said first joint member and said second joint member. 
     
     
         4 . The foldable chair, as recited in  claim 3 , wherein a depth of said engaging cavity matches with a length of said second joint member. 
     
     
         5 . The foldable chair, as recited in  claim 1 , wherein said supporting frame has a first coupling hole and said seat frame has a second coupling hole, wherein said connecting member has two ends rotatably coupled at said first and second coupling holes through said first and second joint members. 
     
     
         6 . The foldable chair, as recited in  claim 4 , wherein said supporting frame has a first coupling hole and said seat frame has a second coupling hole, wherein said connecting member has two ends rotatably coupled at said first and second coupling holes through said first and second joint members. 
     
     
         7 . The foldable chair, as recited in  claim 1 , wherein said reinforcing joint further comprises a first attachment panel and a second attachment panel securely affixing to said seat frame and said supporting frame respectively, wherein said first and second joint members are integrally extended from said first and second attachment panels respectively. 
     
     
         8 . The foldable chair, as recited in  claim 6 , wherein said reinforcing joint further comprises a first attachment panel and a second attachment panel securely affixing to said seat frame and said supporting frame respectively, wherein said first and second joint members are integrally extended from said first and second attachment panels respectively. 
     
     
         9 . The foldable chair, as recited in  claim 1 , wherein said supporting frame comprises a front leg frame and a rear leg frame, wherein said seat frame is pivotally coupled at said front and rear leg frames via said reinforcing joints respectively. 
     
     
         10 . The foldable chair, as recited in  claim 8 , wherein said supporting frame comprises a front leg frame and a rear leg frame, wherein said seat frame is pivotally coupled at said front and rear leg frames via said reinforcing joints respectively. 
     
     
         11 . The foldable chair, as recited in  claim 9 , wherein said supporting frame further comprises a back frame upwardly extended from said front leg frame, and a joint stopper coupled at an upper end of said rear leg frame, wherein said joint stopper has a front stopping surface configured for biasing against said back frame to retain said foldable frame at an unfolded position and a rear joining surface arranged in such a manner that when two of said foldable chairs are stacked with each other, said rear joint surface of one foldable chair is engaged with said back frame of another foldable chair so as to retain said foldable chairs in a stacked manner. 
     
     
         12 . The foldable chair, as recited in  claim 10 , wherein said supporting frame further comprises a back frame upwardly extended from said front leg frame, and a joint stopper coupled at an upper end of said rear leg frame, wherein said joint stopper has a front stopping surface configured for biasing against said back frame to retain said foldable frame at an unfolded position and a rear joining surface arranged in such a manner that when two of said foldable chairs are stacked with each other, said rear joint surface of one foldable chair is engaged with said back frame of another foldable chair so as to retain said foldable chairs in a stacked manner. 
     
     
         13 . The foldable chair, as recited in  claim 12 , wherein said front stopping surface and said rear joining surface are configured to have a contour matching with a contour of a rear side of said back frame and a contour of a front side of said back frame respectively. 
     
     
         14 . A reinforcing joint for pivotally connecting first and second construction tubes of a foldable chair, comprising:
 a first joint member, having an engaging cavity, arranged for coupling at the first construction tube;   a second joint member arranged for coupling at the second construction tube, wherein said second joint member is received at said engaging cavity to frictionally couple with said first joint member, such that said second joint member serves as a supporting shaft for supporting between the two construction tubes and serves as a rotatable shaft to enable said second joint member to be rotated at said first joint member for a pivotal movement between the two construction tubes; and   a connecting member extended through said first joint member and said second joint member to ensure an engagement therebetween.   
     
     
         15 . The reinforcing joint, as recited in  claim 14 , wherein said first joint member has a tubular shape defining said engaging cavity therein, such that said second joint member is inserted into said engaging cavity at a position that an outer circumferential surface of said second joint member is frictionally engaged with an inner circumferential surface of said engaging cavity. 
     
     
         16 . The reinforcing joint, as recited in  claim 15 , wherein said engaging cavity is a conical cavity and said second joint member has a corresponding conical shape to enlarge a frictional contacting area between said first joint member and said second joint member. 
     
     
         17 . The reinforcing joint, as recited in  claim 14 , wherein a depth of said engaging cavity matches with a length of said second joint member. 
     
     
         18 . The reinforcing joint, as recited in  claim 16 , wherein a depth of said engaging cavity matches with a length of said second joint member. 
     
     
         19 . The reinforcing joint, as recited in  claim 14 , further comprising a first attachment panel and a second attachment panel for securely affixing to said seat frame and said supporting frame respectively, wherein said first and second joint members are integrally extended from said first and second attachment panels respectively. 
     
     
         20 . The reinforcing joint, as recited in  claim 18 , further comprising a first attachment panel and a second attachment panel for securely affixing to said seat frame and said supporting frame respectively, wherein said first and second joint members are integrally extended from said first and second attachment panels respectively. 
     
     
         21 . A foldable chair, comprising:
 a foldable frame which comprises a supporting frame and a seat frame, wherein said supporting frame comprises a front leg frame, a rear leg frame and a back frame upwardly extended from said front leg frame;   at least a joint pivotally coupled at said front leg frame and said rear leg frame for pivotally connecting said supporting frame with said frame such that said foldable frame is adapted to move between a folded position that said supporting frame supports said seat frame at a vertical manner, and an unfolded position that said support frame is moved at a predetermined angle to support said seat frame at a horizontal manner; and   a joint stopper, which is coupled at an upper portion of said rear leg frame, having a front stopping surface configured for biasing against said back leg frame to retain said foldable frame at said unfolded position and a rear joining surface arranged in such a manner that when two of said foldable chairs are stacked with each other, said rear joint surface of one of said foldable chairs is engaged with said back frame of another said foldable chair so as to retain said foldable chairs in a stacked manner.   
     
     
         22 . The foldable chair, as recited in  claim 21 , wherein said front stopping surface and said rear joining surface are configured to have a contour matching with a contour of a rear said of said back frame and a contour of a front side of said back frame respectively.