Rotating folding structure for folding chair frame and folding chair frame and folding chair thereof

Abstract

A rotating folding structure for a folding chair frame, a folding chair frame and a folding chair thereof, it is unfolded and folded by rotating a first rotating support base, a second rotating support base, a third rotating support base, and a fourth rotating support base that are coaxially connected; it has an ingenious design; after the rotating folding structure is unfolded, the first rotating support base and the second rotating support base are limited from mutual rotation by the snap-fit mechanism, through the cooperation of the respective abutment-limiting walls, the rotation of the third rotating support base and the fourth rotating support base can be restricted, ensuring high stability after unfolding and smaller volume after folding.

1 . A rotating folding structure for a folding chair frame, comprising a first rotating support base, a second rotating support base, a third rotating support base and a fourth rotating support base;  
       the first rotating support base comprises a first base block, a horizontal first upper plate and a horizontal first lower plate are arranged on the first base block;  
       the second rotating support base comprises a second base block, a horizontal second upper plate and a horizontal second lower plate are arranged on the second base block;  
       the first upper plate and the first lower plate interlace and insert into the second upper plate and the second lower plate, with the first upper plate located above the second upper plate;  
       the third rotating support base comprises a third base block, a horizontal third upper plate and a horizontal third lower plate are arranged on the third base block;  
       the fourth rotating support base comprises a fourth base block, a horizontal fourth upper plate and a horizontal fourth lower plate are arranged on the fourth base block;  
       the third upper plate and the third lower plate interlace and insert into the fourth upper plate and the fourth lower plate, with the fourth upper plate located above the third upper plate;  
       the third upper plate, the third lower plate, the fourth upper plate, and the fourth lower plate are partially or fully inserted between the second upper plate and the first lower plate; 
       the first rotating support base, the second rotating support base, the third rotating support base, and the fourth rotating support base are movably sleeved on a rotating shaft; 
       the first rotating support base, the second rotating support base, the third rotating support base, and the fourth rotating support base are configured to be unfolded and folded by rotation. 
     
     
         2 . The rotating folding structure for the folding chair frame of  claim 1 , wherein a first insertion hole is formed on a sidewall of the first base block facing away from the first upper plate, a second insertion hole is formed on a sidewall of the second base block facing away from the second upper plate, a third insertion hole is formed on a sidewall of the third base block facing away from the third upper plate, a fourth insertion hole is formed on a sidewall of the fourth base block facing away from the fourth upper plate.  
     
     
         3 . The rotating folding structure for the folding chair frame of  claim 2 , wherein a top surface of the first lower plate is provided with a first protrusion, and an end of the first protrusion is provided with a vertical first abutment-limiting sidewall, the first protrusion is provided with a vertical second abutment-limiting side wall along a partial contour of the first lower plate. 
     
     
         4 . The rotating folding structure for the folding chair frame of  claim 3 , wherein a bottom surface of the second upper plate is provided with a second protrusion, and an end of this second protrusion is provided with a vertical third abutment-limiting sidewall, the second protrusion is provided with a vertical fourth abutment-limiting side wall along a partial contour of the second upper plate; 
       the fourth abutment-limiting side wall cooperates with a first side wall of the first base block between the first protrusion and the first upper plate; 
       the second abutment-limiting side wall cooperates with a second side wall of the second base block between the second protrusion and the second lower plate. 
     
     
         5 . The rotating folding structure for the folding chair frame of  claim 4 , wherein a first extension plate extends from a side of the third lower plate, a top of the first extension plate is provided with a third protrusion, the third protrusion is provided with a fifth abutment-limiting sidewall facing away from the third base block; 
       the third upper plate extends outwardly to form a first limiting plate, away from the third base block. 
     
     
         6 . The rotating folding structure for the folding chair frame of  claim 5 , wherein a second extension plate extends from a side of the fourth upper plate, a bottom surface of the second extension plate is provided with a fourth protrusion, the fourth protrusion is provided with a sixth abutment-limiting sidewall, facing away from the fourth base block;  
       the fourth lower plate extends outwardly to form a second limiting plate, away from the fourth base block; 
       one side wall of the first limiting plate cooperates with the sixth abutment-limiting sidewall;  
       one side wall of the second limiting plate cooperates with the fifth abutment-limiting sidewall. 
     
     
         7 . The rotating folding structure for the folding chair frame of  claim 6 , wherein the other side wall of the first limiting plate cooperates with the first abutment-limiting sidewall, and the other side wall of the second limiting plate cooperates with the third abutment-limiting sidewall. 
     
     
         8 . The folding chair frame, comprising the rotating folding structure described in  claim 1 . 
     
     
         9 . The folding chair frame of  claim 8 , wherein horizontal support rods are fixedly inserted into the first insertion hole, second insertion hole, third insertion hole, and fourth insertion hole; 
       one horizontal support rod inserted into the first insertion hole is connected to a right rear upper support rod and a right rear lower support foot rod via one Y-shaped connector; one horizontal support rod inserted into the second insertion hole is connected to a left rear upper support rod and a left rear lower support foot rod via one Y-shaped connector, one horizontal support rod inserted into the third insertion hole is connected to a left front upper support rod and a left front lower support foot rod via one Y-shaped connector, one horizontal support rod inserted into the fourth insertion hole is connected to a right front upper support rod and a right front lower support foot rod via one Y-shaped connector. 
     
     
         10 . A folding chair, comprising the folding chair frame and a chair fabric described in  claim 8 .