Foldable chair and reinforcement structure for leg pipe

Abstract

A foldable chair comprises two front leg pipes, two rear leg pipes, and a seat plate. Each of the two front leg pipes is sleeved with an outer sleeve, and an insert member moves in a radial direction to connect a corresponding one of the two front leg pipes and the outer sleeve in series. An inner end of the insert member extends inward and toward a corresponding one of two sides of the seat plate, and the inner end of the insert member is connected to the corresponding one of the two sides of the seat plate, or the inner end of the insert member is connected to the corresponding one of the two sides of the seat plate through a sliding sleeve. Part of weight is transmitted to the corresponding one of the two front leg pipes and the outer sleeve through the outer sleeve.

What is claimed is: 
     
         1 . A foldable chair, comprising:
 two front leg pipes symmetrically arranged in a left and right direction,   two rear leg pipes symmetrically arranged in the left and right direction, and   a seat plate, wherein:
 two sides of the seat plate are connected to the two front leg pipes and the two rear leg pipes, 
 the two front leg pipes are arranged obliquely when the foldable chair is in an open use state, 
 each of the two front leg pipes is sleeved with an outer sleeve located at a position at which a corresponding one of the two front leg pipes is connected to the seat plate, 
 an insert member is configured to move in a radial direction to connect the corresponding one of the two front leg pipes and the outer sleeve in series, 
 an inner end of the insert member extends inward and toward a corresponding one of the two sides of the seat plate, 
 the inner end of the insert member is connected to the corresponding one of the two sides of the seat plate, or the inner end of the insert member is connected to the corresponding one of the two sides of the seat plate through a sliding sleeve, and 
 part of weight borne by the seat plate is transmitted to the corresponding one of the two front leg pipes and the outer sleeve through the outer sleeve. 
   
     
     
         2 . The foldable chair according to  claim 1 , wherein:
 the insert member is a rivet, and   the seat plate is configured to be rotated around the insert member.   
     
     
         3 . The foldable chair according to  claim 2 , wherein:
 the insert member is configured to enable the corresponding one of the two front leg pipes, the outer sleeve, and the corresponding one of the two sides of the seat plate to be connected together in series.   
     
     
         4 . The foldable chair according to  claim 3 , wherein:
 a gasket is disposed between the outer sleeve and the corresponding one of the two sides of the seat plate, and   the insert member is configured to pass through the gasket.   
     
     
         5 . The foldable chair according to  claim 4 , wherein:
 the gasket has a shape other than flat.   
     
     
         6 . The foldable chair according to  claim 2 , wherein:
 the inner end of the insert member is slidably connected to the corresponding one of the two sides of the seat plate through the sliding sleeve.   
     
     
         7 . The foldable chair according to  claim 1 , wherein:
 a length from an upper opening of the outer sleeve to the insert member is shorter than a length from a lower opening of the outer sleeve to the insert member.   
     
     
         8 . A reinforcement structure for a leg pipe, wherein:
 the leg pipe is arranged obliquely,   an insert member is inserted radially on the leg pipe,   an outer sleeve is sleeved at a position of the insert member on the leg pipe,   the leg pipe and the outer sleeve are connected in series by the insert member,   an inner end of the insert member is directly or indirectly connected to an object-bearing member, and   part of weight of the object-bearing member is transmitted to the leg pipe and the outer sleeve through the insert member.   
     
     
         9 . The reinforcement structure for a leg pipe according to  claim 8 , wherein:
 the insert member is a rivet.   
     
     
         10 . The reinforcement structure for a leg pipe according to  claim 9 , wherein:
 the insert member is configured to enable the leg pipe, the outer sleeve, and the object-bearing member to be connected together in series.