Chair

Abstract

An object of this invention is to provide a chair having less sliding resistance, less abrasion and less noise with prevention of partially contacting each component while the chair is making a rocking movement. The chair comprises a support frame 4 supported by a support rod 12 , a back frame 5 that can make an inclining movement relative to the support frame 4 , a seat frame 6 that is related to the support frame 4 and the back frame 5 so as to make a movement in conjunction with the back frame 5 toward a direction along the inclining movement of the back frame 5 , and a spring case 71 arranged along the seat frame 6 in a state that a proximal point part of the spring case 71 is supported by the support frame 4 so as to introduce a spring force against a force of an interlocking movement of the seat frame 6 and the back frame 5 to the support frame 4 , wherein a spring 72 is so arranged to be compressed by a movement of the seat frame 6 relative to the spring case 71 , and a slide guide part 66 to make the spring case 71 and the seat frame 6 line-contact in a direction orthogonal to the back and forth direction is arranged between the spring case 71 and the seat frame 6.

1 . A chair comprising a support frame supported by a support rod, a back frame that can make a inclining movement relative to the support frame, a seat frame that is related to the support frame and the back frame so as to make a movement in conjunction with the back frame toward a direction along the inclining movement of the back frame, and a spring case arranged along the seat frame in a state that a proximal point part of the spring case is supported by the support frame so as to introduce a spring force against a force of the interlocking movement of the seat frame and the back frame to the support frame, and is so arranged that a spring is compressed by a movement of the seat frame relative to the spring case, and is characterized by that
 a slide guide part to make the spring case and the seat frame line-contact in a direction orthogonal to a back and forth direction or point-contact is arranged between the spring case and the seat frame.   
     
     
         2 . The chair described in  claim 1 , wherein
 the spring case is so arranged that the proximal point part is rotatably supported by the support frame around a transversal shaft and a base spring bearing is formed on an extending part locating at a distal end side, a movable spring bearing is arranged at the seat frame side to face the base spring bearing and a spring is arranged between the base spring bearing and the movable spring bearing.   
     
     
         3 . The chair described in  claim 2 , wherein
 the support frame and the spring case can be mounted and dismounted at an assembled angle at least more upright than an used angle, and a cam surface is arranged for the support frame to urge the movable spring bearing toward a direction that the spring is compressed in accordance with a movement of the spring case from the assembled angle to the used angle.   
     
     
         4 . The chair described in  claim 2 , wherein
 a void part is formed on a part of the seat frame, the spring case is housed in the void part at generally the same height as that of the seat frame and a first slide guide part extending in the lateral direction is integrally formed with the seat frame at a position to press the top surface of the spring case.   
     
     
         5 . The chair described in  claim 3 , wherein
 a void part is formed on a part of the seat frame, the spring case is housed in the void part at generally the same height as that of the seat frame and a first slide guide part extending in the lateral direction is integrally formed with the seat frame at a position to press the top surface of the spring case.   
     
     
         6 . The chair described in  claim 4 , wherein
 the first slide guide part is arranged only at one position along the back and forth direction.   
     
     
         7 . The chair described in  claim 5 , wherein
 the first slide guide part is arranged only at one position along the back and forth direction.   
     
     
         8 . The chair described in  claim 2 , wherein
 the spring case is housed between the right and left walls of the seat frame, and a second slide guide part extending in the vertical direction is arranged on either the right and left walls of the seat frame or the right and left walls of the spring case facing the right and left walls of the seat frame.   
     
     
         9 . The chair described in  claim 3 , wherein
 the spring case is housed between the right and left walls of the seat frame, and a second slide guide part extending in the vertical direction is arranged on either the right and left walls of the seat frame or the right and left walls of the spring case facing the right and left walls of the seat frame.   
     
     
         10 . The chair described in  claim 4 , wherein
 the spring case is housed between the right and left walls of the seat frame, and a second slide guide part extending in the vertical direction is arranged on either the right and left walls of the seat frame or the right and left walls of the spring case facing the right and left walls of the seat frame.   
     
     
         11 . The chair described in  claim 5 , wherein
 the spring case is housed between the right and left walls of the seat frame, and a second slide guide part extending in the vertical direction is arranged on either the right and left walls of the seat frame or the right and left walls of the spring case facing the right and left walls of the seat frame.   
     
     
         12 . The chair described in  claim 6 , wherein
 the spring case is housed between the right and left walls of the seat frame, and a second slide guide part extending in the vertical direction is arranged on either the right and left walls of the seat frame or the right and left walls of the spring case facing the right and left walls of the seat frame.   
     
     
         13 . The chair described in  claim 7 , wherein
 the spring case is housed between the right and left walls of the seat frame, and a second slide guide part extending in the vertical direction is arranged on either the right and left walls of the seat frame or the right and left walls of the spring case facing the right and left walls of the seat frame.   
     
     
         14 . The chair described in  claim 8 , wherein
 the second slide guide part is arranged only at one position along the back and forth direction.   
     
     
         15 . The chair described in either of  claim 4 , wherein
 the void part opens rearward of the seat frame and the spring case can be mounted on and dismounted from the void part of the seat frame from the rearward.   
     
     
         16 . The chair described in  claim 1 , wherein
 the slide guide part is a projecting part whose distal end is curved to form a convex and is integrally formed with the spring case or the seat frame.