Chair

Abstract

A chair may include a backrest, a seat, and a frame that supports the backrest and seat. The frame may include a plurality of interfacing portions. Each interfacing portion may include a receivable surface and a receiving surface. The receiving surface may have a shape configured to accept a surface having substantially the same shape as the receivable surface. Each interfacing portion may further include an offset separating the receivable surface and the receiving surface. Each interfacing portion may further include a profile having a length larger than the offset.

What is claimed is: 
     
         1 . A chair configured to nest with a like chair, the chair comprising:
 a backrest;   a seat; and   a frame sized and configured to support the backrest and the seat, the frame comprising:   a plurality of interfacing portions, each interfacing portion comprising:
 a receivable surface; 
 a receiving surface having a shape configured to accept a surface having substantially the same shape as the receivable surface; 
 an offset separating the receivable surface and the receiving surface; and 
 a profile having a length larger than the offset. 
   
     
     
         2 . The chair of  claim 1 , wherein each of the interfacing portions further includes a cross-section substantially in the shape of a parallelogram. 
     
     
         3 . The chair of  claim 2 , wherein the cross-section further includes a first side associated with the offset. 
     
     
         4 . The chair of  claim 1 , wherein the profile has a length equal to or greater than one-hundred-thirty percent (130%) of the offset and equal to or less than one-hundred-fifty percent (150%) of the offset. 
     
     
         5 . The chair of  claim 1 , wherein the receivable surface is planar. 
     
     
         6 . The chair of  claim 1 , wherein the receiving surface is planar. 
     
     
         7 . The chair of  claim 1 , wherein the frame is further sized and configured to form a plurality of legs, each including an interfacing portion of the plurality of interfacing portions. 
     
     
         8 . The chair of  claim 7 , wherein the plurality of legs include a first front leg, a second front leg, a first rear leg, and a second rear leg. 
     
     
         9 . The chair of  claim 8 , wherein the first front leg and the second front leg are oriented at an angle being equal to or greater than four degrees from vertical and equal to or less than ten degrees from vertical. 
     
     
         10 . The chair of  claim 8 , wherein the first rear leg and the second rear leg are oriented at an angle being equal to or greater than twenty degrees from vertical and equal to or less than thirty degrees from vertical. 
     
     
         11 . The chair of  claim 1 , wherein at least one of the seat and the backrest is formed from blow-molded plastic. 
     
     
         12 . The chair of  claim 1 , wherein the frame includes a hollow metal tube having a cross-section substantially in the shape of a parallelogram having a side substantially equal in length to the offset. 
     
     
         13 . A frame comprising:
 a plurality of interfacing portions, each interfacing portion comprising:
 a receivable surface; 
 a receiving surface having a shape configured to accept a surface having substantially the same shape as the receivable surface; 
 an offset separating the receivable surface and the receiving surface in a first direction; and 
 a profile in the first direction, the profile having a length larger than the offset. 
   
     
     
         14 . The frame of  claim 13 , further comprising a hollow metal tube. 
     
     
         15 . The frame of  claim 14 , the hollow metal tube having a cross-section substantially in the shape of a parallelogram. 
     
     
         16 . The frame of  claim 15 , wherein the cross-section includes a first side substantially equal in length to the offset. 
     
     
         17 . The frame of  claim 16 , wherein the cross-section further includes:
 a second side associated with the receiving surface; and   a third side associated with the receivable surface.   
     
     
         18 . The frame of  claim 13 , further comprising a plurality of legs, each of the plurality of legs including at least one interfacing portion of the plurality of interfacing portions. 
     
     
         19 . The frame of  claim 18 , wherein:
 the plurality of legs include a first front leg, a second front leg, a first rear leg, and a second rear leg;   the first front leg and the second front leg are oriented at an angle being equal to or greater than four degrees from vertical and equal to or less than ten degrees from vertical; and   the first rear leg and the second rear leg are oriented at an angle being equal to or greater than twenty degrees from vertical and equal to or less than thirty degrees from vertical.   
     
     
         20 . A chair configured to nest with a like chair, the chair comprising:
 a backrest formed at least in part from blow-molded plastic;   a seat formed at least in part from blow-molded plastic;   a frame including plurality of legs formed at least in part from hollow metal tubes having a cross-section substantially in the shape of a parallelogram, each of the legs including an interfacing portion comprising:
 a substantially planar receivable surface associated with a first side of the hollow metal tubes; 
 a substantially planar receiving surface associated with a second side of the hollow metal tubes, the second side opposite the first side; 
 an offset associated with a third side of the hollow metal tubes; and 
 a profile associated with an overall thickness of the hollow metal tubes in the direction of the offset, the profile having a length larger than a length of the offset.