Inclining chair

Abstract

In case the seat portion of the inclining chair is inclined periodically, if a supporting shaft to incline the seat portion is arranged away from a position supporting an ischial tuberosity portion of a seated person in an ordinary posture of sitting, an upper body of the seated person makes an up and down movement widely in compliance with a periodical inclining movement of the seat portion, which might cause dizziness due to a vertical shock to the upper body of the seated person. The supporting shaft 61 d to incline the seat portion 3 periodically is arranged near an ischial tuberosity portion HB of a seated person in an ordinary sitting posture, namely, at the rear of a center CL 1 along a back and forth direction of the seat portion 3 . More specifically, the supporting shaft 61 d is arranged within a range of 50 mm to 180 mm in front of a front face of a backrest so that fatigue of a hip, a femur, a lumber and a back and tumefaction of a lower limb of a seated person are mitigated and occurrence of dizziness is reduced as well.

1 . An inclining chair comprising a supporting portion that supports a seat portion in an inclinable manner and an inclining mechanism that periodically inclines the seat portion supported by the supporting portion, and characterized by that  
       a position of a fulcrum to incline the seat portion supported by the supporting portion is arranged near an ischial tuberosity portion of a seated person at the rear of a center along a back and forth direction of the seat portion.  
     
     
         2 . An inclining chair comprising a supporting portion that supports a seat portion in an inclinable manner and an inclining mechanism that periodically inclines the seat portion supported by the supporting portion, and characterized by that  
       a changing means is provided that can change a position of a fulcrum to incline the seat portion supported by the supporting portion along a back and forth direction of the seat portion.  
     
     
         3 . An inclining chair comprising a supporting portion that supports a seat portion in an inclinable manner and an elevator mechanism that elevates the seat portion at a position apart from the supporting portion,  
       in which the seat portion is inclined periodically by the use of the supporting portion and the elevator mechanism, characterized by that  
       a changing means is provided that can change a position of a fulcrum to incline the seat portion supported by the supporting portion along a back and forth direction of the seat portion.  
     
     
         4 . The inclining chair described in  claim 2  or  3  and characterized by that the changing means is a mean that can change a position of a supporting shaft constituting the supporting portion in a stepless manner along a back and forth direction of the seat portion.  
     
     
         5 . The inclining chair described in  claim 2  or  3  and characterized by that the changing means is a mean that can change a position of a supporting shaft constituting the supporting portion in a stepwise manner along a back and forth direction of the seat portion.  
     
     
         6 . The inclining chair described in  claim 2  or  3  and characterized by that the changing meaning is a mean that can change a position on which the supporting portion having a supporting shaft is mounted along a back and forth direction of the seat portion.  
     
     
         7 . The inclining chair described in  claim 1 ,  2 ,  3 ,  4 ,  5  or  6  and characterized by that the position of the fulcrum to incline the seat portion is arranged within a range of 50 mm to 180 mm in front of a front face of a backrest body.