Frame chair for easy stacking and cascading

Abstract

The frame chair has a metal frame containing two loop stands and a number of lateral beams connecting the two loop stands. A seat is flatly and fixedly placed on the loop stands and a back rest is held by two back columns extended from the loop stands. A first connecting block is configured beneath a front section of the left loop stand and a back section of the right loop stand, respectively. A second connecting block is configured beneath a back section of the left loop stand and a front section of the right loop stand, respectively. The first connecting block has a first hook and the second connecting block has a second hook where the hooks have corresponding and matched shapes for engaging with each other. As such, two aligned frame chairs could be locked reliably together.

1 . A frame chair, comprising
 a frame having a left loop stand, a right loop stand parallel to said left loop stand, a plurality of lateral beams configured laterally across and between said left and right loop stands, and two back columns extended from upper back corners of said loop stands, respectively;   a seat fixedly configured on top of said left and right loop stands;   a back rest fixedly configured between said back columns;   two first connecting blocks configured beneath said left and right loop stands, respectively; and   two second connecting blocks configured beneath said left and right loop stands, respectively;   wherein each first connecting block has a laterally outward extended first hook; each second connecting block has a laterally outward extended second hook; said first and second hooks have corresponding and matched shapes and positions for engaging with each other so that two aligned said frame chairs are locked reliably together.   
     
     
         2 . The frame chair according to  claim 1 , wherein a plurality of support plates are configured along top edges of said loop stands beneath said seat; positioning rods beneath said seat are provided for embedding into positioning holes on said support plates, and positioning holes are provided beneath said seat for receiving bolts running through said support plates. 
     
     
         3 . The frame chair according to  claim 1 , wherein said seat's lateral edges are bended downward to form curves rims, wrapping said loop stands' top edges. 
     
     
         4 . The frame chair according to  claim 1 , wherein an indentation is formed at each lateral corner of said seat. 
     
     
         5 . The frame chair according to  claim 1 , wherein, along said back rest's left and right edges, two tubes are provided so as to receive said back columns, respectively; after said back rest is installed on said back columns, bolts are screwed laterally through positioning holes on said tubes and said back columns so that said back rest is fixedly and reliably joined to said frame. 
     
     
         6 . The frame chair according to  claim 1 , wherein said first hook has an L shape pointing forward; and said second hook has an L shape pointing backward. 
     
     
         7 . The frame chair according to  claim 1 , wherein said first and second connecting blocks have open tubular channels, respectively, for the embedment of said loop stands' bottom edges; said channels have protrusions along lateral edges of top openings, respectively; correspondingly, bottom edges of said loop stands have indentations for receiving said protrusions; and, when said connecting blocks are snapped onto said loop stands, said protrusions engage said indentations. 
     
     
         8 . The frame chair according to  claim 1 , wherein said first connecting block and said second connecting block on a left loop stand of a first frame chair are locked with said second connecting block and said first connecting block on a right loop stand of a second frame chair adjacent to said first frame chair.