Chair with waist rest and armrests

Abstract

A chair with waist rest and armrests comprises a connecting element, a seat assembly, a chair back, a waist rest assembly, two armrest assemblies, a height adjusting apparatus and a leg assembly. The chair can be produced by a small number of simple components to include waist rest assembly and armrest assemblies, thus reducing the cost in production and assembly

1 . A chair with waist rest and armrests comprising:
 a connecting element including a main body, two tube portions disposed at both sides of the main body, two cylinder portions which are disposed at both sides of the main body between the two tube elements;   a seat assembly including a cushion body disposed on an upper end surface of the main body of the connecting element, and a loading plate which is disposed on a lower end surface of the main body of the connecting element and locked to the cushion body;   a chair back including a back rest plate, and two tube elements which are connected to the back rest plate and engaged on the two cylinder portions of the connecting element;   a waist rest assembly including a support element and a waist rest assembly plate, the support element being locked between the two tube elements of the chair back and including two locking portions to be used to lock the tube elements and the cylinder portions, and a middle portion between the two locking portions, the waist rest assembly plate being disposed on the middle portion; and   two armrest assemblies being inserted into the respective tube portions of the connecting element;   a height adjusting apparatus including an outer tube, and an inner tube which is connected to the loading plate and inserted in the outer tube in a liftable manner; and   a leg assembly being connected to the outer tube of the height adjusting apparatus.   
     
     
         2 . The chair with waist rest and armrests as claimed in  claim 1 , wherein the cushion body includes a seat plate which is disposed on the upper end surface of the main body and locked to the loading plate, and a soft cushion engaged on the seat plate. 
     
     
         3 . The chair with waist rest and armrests as claimed in  claim 2 , wherein the loading plate, the main body and the seat plate are locked together through screws. 
     
     
         4 . The chair with waist rest and armrests as claimed in  claim 1 , wherein the locking portions of the support element, the tube elements of the chair back and the cylinder portions of the connecting element are locked together through screws. 
     
     
         5 . The chair with waist rest and armrests as claimed in  claim 1 , wherein a curved elastic portion is connected between the respective two locking portions and the middle portion of the support element of the waist rest assembly. 
     
     
         6 . The chair with waist rest and armrests as claimed in  claim 1 , wherein the middle portion of the support element of the waist rest assembly includes hollow cylinders, and the waist rest assembly plate of the waist rest assembly includes protruding cylinders to be inserted into the hollow cylinders of the support element. 
     
     
         7 . The chair with waist rest and armrests as claimed in  claim 1 , wherein the loading plate of the seat assembly includes an insertion portion for insertion of a top end of the inner tube of the height adjusting apparatus.