Sitting tool and chair

Abstract

A sitting tool includes a seat panel, which includes a first seating face and second seating face extending contiguously from the first seating face toward front of the sitting tool. The second seating face forms a step higher than the first seating face with its end face disposed on the side of the first seating face. When the first seating face supports the hips and the second seating face supports the upper thighs of sitting person, the step suppresses forward displacement of the ischiums of sitting person. The first seating face extends over the entire length of the seat panel in left-right direction of the sitting tool without interrupted by the step.

1 - 8 . (canceled) 
     
     
         9 . A sitting tool including a seat panel, the seat panel comprising:
 a first seating face; and   a second seating face that extends contiguously from the first seating face toward a front of the sitting tool, wherein   the second seating face forms a step higher than the first seating face by means of an end face of the second seating face disposed on the side of the first seating face, the second face, excluding the end face thereof disposed on the side of the first seating face, being disposed higher than the first seating face,   in a planar view, the end face of the second seating face disposed on the side of the first seating face is curved or bent to be convex toward the front of the sitting tool between portions of left and right side edges of the seat panel, the portions of the left and right side edges being located between and excluding front and rear edges of the seat panel,   a maximum length of the first seating face in a front-rear direction of the sitting tool is from 70 mm to 250 mm, and   a maximum length of the second seating face, excluding the end face of the second seating face disposed on the side of the first seating face, in an area excluding a middle area in a left-right direction of the sitting tool, in the front-rear direction of the sitting tool, is from 3 mm to 40 mm.   
     
     
         10 . The sitting tool of  claim 9 , further comprising:
 a rear panel that extends from an end portion of the seat panel disposed on the side of the first seating face and that, at least partly, extends substantially perpendicularly relative to the seat panel.   
     
     
         11 . The sitting tool of  claim 9 , further comprising:
 a support body that supports the seat panel, the support body including:
 a bottom panel on which the seat panel is placed; and 
 a rear panel that extends from an end portion of the bottom panel disposed on the side of the first seating face of the seat panel and that, at least partly, extends substantially perpendicularly relative to the bottom panel. 
   
     
     
         12 . The sitting tool of any one of  claim 9 , wherein
 upper and reverse faces of a part of the seat panel disposed on the side of the first seating face are each formed in a corrugated shape such that a curved ridge portion and a curved recessed portion each extending in the front-rear direction of the sitting tool are alternately coupled in the left-right direction of the sitting tool.   
     
     
         13 . A chair including a seat panel, a rear panel, and a leg portion, the seat panel comprising:
 a first seating face; and   a second seating face that contiguously extends from the first seating face toward a front of the chair, wherein   a front face of the rear panel disposed on the side of the seat panel at least partly extends substantially perpendicularly relative to the first seating face,   the second seating face forms a step higher than the first seating face by means of an end face of the second seating face disposed on the side of the first seating face, the second face, excluding the end face thereof disposed on the side of the first seating face, being disposed higher than the first seating face,   in a planar view, the end face of the second seating face disposed on the side of the first seating face is curved or bent to be convex toward the front of the chair between portions of left and right side edges of the seat panel, the portions of the left and right side edges being located between and excluding front and rear edges of the seat panel,   a maximum length of the first seating face in a front-rear direction of the chair is from 70 mm to 250 mm, and   a maximum length of the second seating face, excluding the end face of the second seating face disposed on the side of the first seating face, in an area excluding a middle area in a left-right direction of the chair, in the front-rear direction of the chair, is from 3 mm to 40 mm.   
     
     
         14 . The sitting tool of any one of  claim 10 , wherein
 upper and reverse faces of a part of the seat panel disposed on the side of the first seating face are each formed in a corrugated shape such that a curved ridge portion and a curved recessed portion each extending in the front-rear direction of the sitting tool are alternately coupled in the left-right direction of the sitting tool.   
     
     
         15 . The sitting tool of any one of  claim 11 , wherein
 upper and reverse faces of a part of the seat panel disposed on the side of the first seating face are each formed in a corrugated shape such that a curved ridge portion and a curved recessed portion each extending in the front-rear direction of the sitting tool are alternately coupled in the left-right direction of the sitting tool.