Chair

Abstract

The present invention relates to a chair having a center of gravity that can be intentionally made to adopt an unstable state when the chair is sat upon. The objective of the present invention is to provide a self-standing type chair that is unstable when in use and that automatically stands by itself using auxiliary legs when not in use, and that is convenient to handle. The main feature of the present invention is that, in order for a chair that is unstable when in use to be self-standing when not in use, auxiliary legs ( 14 a , 14 b ), other than a main leg, form new points of contact with a floor or ground surface by utilizing the action of an urging means and a driving force transmission means that accompanies the removal of weight from the chair by a user.

1 . A chair, comprising a seating face and one or two main legs that are attached to the bottom of the seating face substantially vertical to the seating face and at least two auxiliary legs that are attached via a rotary shaft provided around the main leg, with the front end on the opposite side of the part attached to the rotary shaft capable of being rotated within the face including the main leg, wherein the front end of the auxiliary leg at the opposite side of the part attached to the rotary shaft comes into contact with the face on which the chair is placed due to the effect of an urging means and a driving force transmission means attached to the main leg when the weight of the user is not loaded, while the front end of the auxiliary leg on the opposite side of the part attached to the rotary shaft is separated from the face on which the chair is placed when the weight of the user is loaded. 
     
     
         2 . The chair according to  claim 1 , wherein the length of the main leg can be adjusted. 
     
     
         3 . The chair according to  claim 1 , wherein a slip resistance is provided at the end on the opposite side of the part of the main leg attached to the seating face. 
     
     
         4 . The chair according to  claim 1 , wherein the front end of the auxiliary leg on the opposite side of the part attached to the rotary shaft is provided with a caster.