Folding chair

Abstract

A folding chair, having a chair frame consisting of a foldable frame. A first front connecting rod of the foldable frame has one end rotatably connected to a front supporting seat, and another end rotatably connected to one end of a front folding seat; a second front connecting rod of the foldable frame has one end rotatably connected to another front supporting seat, and another end fixedly connected to another end of the front folding seat; similar connecting structures are present between a first rear connecting rod, two rear supporting seats, a rear folding seat, and a second rear connecting rod. A first locking mechanism is provided between the first front connecting rod and the front folding seat, and a second locking mechanism is provided between the first rear connecting rod and the rear folding seat.

What is claimed is: 
     
         1 . A folding chair, comprising a chair frame and a chair surface; the chair frame comprises a foldable frame, an upper supporting rod assembly and a lower supporting rod assembly; the upper supporting rod assembly is removably mounted to an upper side of the foldable frame, and the lower supporting rod assembly is removably mounted to a lower side of the foldable frame; the chair surface is removably mounted to an upper side of the upper supporting rod assembly; wherein:
 the foldable frame comprises two front supporting seats, two rear supporting seats, two side connecting rods, a first front connecting rod, a second front connecting rod, a front folding seat, a first rear connecting rod, a second rear connecting rod, and a rear folding seat;   one end of each of the two side connecting rods is fixedly connected to a corresponding rear supporting seat of the two rear supporting seats, and another end of each of the two side connecting rods is fixedly connected to a corresponding front supporting seat of the two front supporting seats; the front folding seat is located between the two front supporting seats; one end of the first front connecting rod is rotatably connected to one of the front supporting seats so as to be rotatable on a horizontal plane, and another end of the first front connecting rod is rotatably connected to one end of the front folding seat so as to be rotatable on the horizontal plane; one end of the second front connecting rod is rotatably connected to another one of the other front supporting seats so as to be rotatable on the horizontal plane, and another end of the second front connecting rod is fixedly connected to another end of the front folding seat; the rear folding seat is located between the two rear supporting seats; one end of the first rear connecting rod is rotatably connected to one of the rear supporting seats so as to be rotated on another horizontal plane, and another end of the first rear connecting rod is rotatably connected to one end of the rear folding seat so as to be rotatable on said another horizontal plane; one end of the second rear connecting rod is rotatably connected to another one of the rear supporting seats so as to be rotated along said another horizontal plane, and another end of the second rear connecting rod is fixedly connected to another end of the rear folding seat;   a first locking mechanism is provided between the first front connecting rod and the front folding seat, and a second locking mechanism is provided between the first rear connecting rod and the rear folding seat; when the foldable frame is in an unfolded state, the first locking mechanism is operable to achieve a locked condition where the first front connecting rod and the front folding seat are locked together, and the second locking mechanism is operable to achieve a locked condition where the first rear connecting rod and the rear folding seat are locked together;   when the first locking mechanism and the second locking mechanism are unlocked, the front folding seat and the rear folding seat are allowed to be pushed horizontally and inwardly to fold the foldable frame.   
     
     
         2 . The folding chair of  claim 1 , wherein the front folding seat, the first front connecting rod, and the second front connecting rod, considered collectively as a whole, are not positioned at a same height in the foldable frame as compared with the rear folding seat, the first rear connecting rod, and the second rear connecting rod, considered collectively as a whole, so that when the foldable frame is in a folded state, the front folding seat, the first front connecting rod, and the second front connecting rod, considered collectively as a whole, and the rear folding seat, the first rear connecting rod, and the second rear connecting rod, considered collectively as a whole, are positioned at different heights without interfering with each other. 
     
     
         3 . The folding chair of  claim 1 , wherein the two front supporting seats and the two rear supporting seats are arranged at four corners of the foldable frame which is formed to have a horizontal rectangular shape; the first front connecting rod and the first rear connecting rod are arranged opposite to each other along a front-rear direction of the foldable frame, and the second front connecting rod and the second rear connecting rod are also arranged opposite to each other along the front-rear direction of the foldable frame. 
     
     
         4 . The folding chair of  claim 1 , wherein the first locking mechanism comprises a first elastic self-locking piece arranged on the first front connecting rod, and a first locking hole arranged on the front folding seat; the second locking mechanism comprises a second elastic self-locking piece arranged on the first rear connecting rod, and a second locking hole arranged on the rear folding seat; when the foldable frame is in the unfolded state, the first elastic self-locking piece is automatically plugged into the first locking hole to lock the first front connecting rod with the front folding seat, and the second elastic self-locking piece is automatically plugged into the second locking hole to lock the first rear connecting rod with the rear folding seat;
 the front folding seat is further provided with a first unlocking member; the rear folding seat is further provided with a second unlocking member; the first elastic self-locking piece is separated from the first locking hole when the first unlocking member is pressed, and the second elastic self-locking piece is separated from the second locking hole when the second unlocking member is pressed.   
     
     
         5 . The folding chair of  claim 4 , wherein the front folding seat is provided with a first open slot penetrating through the front folding seat along a left-right direction of the foldable frame, and opened towards a front direction of the foldable frame; said another end of the first front connecting rod extends into the first open slot from said one end of the front folding seat and is rotatably connected to an upper slot wall and a lower slot wall of the first open slot through a first pin shaft; said another end of the second front connecting rod extends into the first open slot from said another end of the front folding seat and is fixedly connected to the upper slot wall and the lower slot wall of the first open slot through at least one second pin shaft;
 the rear folding seat is provided with a second open slot penetrating through the rear folding seat along the left-right direction of the foldable frame, and opened towards a rear direction of the foldable frame; said another end of the first rear connecting rod extends into the second open slot from said one end of the rear folding seat and is rotatably connected to an upper slot wall and a lower slot wall of the second open slot through a third pin shaft; and said another end of the second rear connecting rod extends into the second open slot from said another end of the rear folding seat and is fixedly connected to the upper slot wall and the lower slot wall of the second open slot through at least one fourth pin shaft.   
     
     
         6 . The folding chair of  claim 1 , wherein distances from a rotatable connection position between the first front connecting rod and the front folding seat to the two front supporting seats respectively are equal, and the rotatable connection position between the first front connecting rod and the front folding seat is located more frontal along a front-rear direction of the foldable frame than a fixed connection position or fixed connection positions between the second front connecting rod and the front folding seat;
 distances from a rotatable connection position between the first rear connecting rod and the rear folding seat to the two rear supporting seats respectively are equal, and the rotatable connection position between the first rear connecting rod and the rear folding seat is located more rearward along the front-rear direction of the foldable frame than a fixed connection position or fixed connection positions between the second rear connecting rod and the rear folding seat.   
     
     
         7 . The folding chair of  claim 5 , wherein said another end of the first front connecting rod extending into the first open slot is fixedly provided with a first rotating joint; one end of the first rotating joint away from the first front connecting rod is rotatably connected to frontal positions at a middle of the upper slot wall and the lower slot wall of the first open slot through the first pin shaft;
 said another end of the first rear connecting rod extending into the second open slot is fixedly provided with a second rotating joint; and one end of the second rotating joint away from the first rear connecting rod is rotatably connected to rear positions at a middle of the upper slot wall and the lower slot wall of the second open slot through the third pin shaft.   
     
     
         8 . The folding chair of  claim 5 , wherein the first locking hole is arranged through the upper slot wall of the first open slot; one end of the first unlocking member movably extends into the first locking hole to be in abutting fit with a plugging end of the first elastic self-locking piece; another end of the first unlocking member is exposed from an upper side of the front folding seat to define a pressing end of the first unlocking member;
 the second locking hole is arranged through the lower slot wall of the second open slot; one end of the second unlocking member movably extends into the second locking hole to be in abutting fit with a plugging end of the second elastic self-locking piece, and another end of the second unlocking member is exposed from a lower side of the rear folding seat to define a pressing end of the second unlocking member.   
     
     
         9 . The folding chair of  claim 8 , wherein a first inclined guiding port located right in front of the first locking hole is arranged on the upper slot wall of the first open slot; the first inclined guiding port guides the plugging end of the first elastic self-locking piece into the first open slot and into the first locking hole when the foldable frame is unfolded;
 a second inclined guiding port located right behind the second locking hole is arranged on the lower slot wall of the second open slot; and the second inclined guiding port guides the plugging end of the second elastic self-locking piece into the second open slot and into the second locking hole when the foldable frame is unfolded.   
     
     
         10 . The folding chair of  claim 4 , wherein the first elastic self-locking piece comprises a first self-locking ball pin and a first spring; the first self-locking ball pin and the first spring are both mounted in the first front connecting rod; a first exposing hole from which the first self-locking ball pin is exposed is formed on a wall of the first front connecting rod; the first spring biases the first self-locking ball pin to expose from the first exposing hole;
 the second elastic self-locking piece comprises a second self-locking ball pin and a second spring; the second self-locking ball pin and the second spring are both mounted in the first rear connecting rod; a second exposing hole from which the second self-locking ball pin is exposed is formed on a wall of the first rear connecting rod; the second spring biases the second self-locking ball pin to expose from the second exposing hole.