Buffering device for chair

Abstract

A buffering device for chair is disposed between a first part of a chair and a second part which is capable of pivoting with respect to the first part and between a first position and a second position. The buffering device is capable of keeping driving the second part to swivel back to the first position, and when the second part is located at the second position, the amount of deformation of an elastic member of the elastic member increases.

1 . A buffering device for chair, disposed between a first part of a chair and a second part which is capable of pivoting with respect to the first part and between a first position and a second position, and comprising:
 an extending portion extending from an appropriate portion of the second part, and on the extending portion being defined a restriction slot;   a fixing rod located corresponding to the extending portion and including a first end to be inserted in a mounting portion fixed to the first part, a second end, and a radially extended flange between the first and second ends;   a bolt being inserted in the second end of the fixing rod and the restriction slot of the extending portion such that a travel of the second end of the fixing rod is restricted within the restriction slot, and   an elastic member biased between the first end of the fixing rod and the flange, in such a manner that the elastic member has one end abutted against the flange and the other end abutted against the mounting portion;   wherein the elastic member keeps abutting against the mounting portion and the flange of the fixing rod, the fixing rod can support the extending portion, and the second part will be pushed back to the first position when it is not subjected to any external force, when the second part is subjected to an external force and pivots towards the second position, an amount of deformation of the elastic member is increased.   
   
   
       2 . The buffering device for chair as claimed in  claim 1 , wherein the mounting portion includes a compensating member and a mounting piece with a hole, a part of the compensating member is fixed to the first part, and the mounting piece is disposed at an appropriate portion of the compensating member, the hole of the mounting piece is provided for insertion of the first end of the fixing rod, and one end of the elastic member which is away from the flange is abutted against the mounting piece. 
   
   
       3 . The buffering device for chair as claimed in  claim 2 , wherein an anti-disengagement bolt is disposed at the first end of the fixing rod. 
   
   
       4 . The buffering device for chair as claimed in  claim 1  further comprising a fixing nut, the mounting portion including a compensating member and two mounting pieces which are arranged at different heights, and each mounting piece having a hole, wherein a part of the compensating member is fixed to the first part, and the mounting pieces are disposed at appropriate portions of the compensating member, one end of the elastic member which is away from the flange is abutted against one of the mounting pieces which is close to the flange, the fixing rod is partially formed with a threaded section on which the fixing nut is engaged, a radial length of the respective fixing nuts is larger than a diameter of the hole of each of the mounting pieces, and the fixing nut is located between the two mounting pieces. 
   
   
       5 . A buffering device for chair, disposed between a first part of a chair and a second part which is capable of pivoting with respect to the first part and between a first position and a second position, and comprising:
 a fixing rod located corresponding to a restriction slot of the second part and including a first end to be inserted in a mounting portion fixed to the first part, a second end, and a radially extended flange between the first and second ends;   a bolt being inserted in the second end of the fixing rod and the restriction slot of the second part such that a travel of the second end of the fixing rod is restricted within the restriction slot, and   an elastic member biased between the first end of the fixing rod and the flange, in such a manner that the elastic member has one end abutted against the flange and the other end abutted against the mounting portion;   wherein the elastic member keeps abutting against the mounting portion and the flange of the fixing rod all the time, the fixing rod can support the second part, and the second part will be pushed back to the first position when it is not subjected to any external force, when the second part is subjected to an external force and pivots towards the second position, an amount of deformation of the elastic member is increased.   
   
   
       6 . The buffering device for chair as claimed in  claim 5 , wherein the mounting portion includes a compensating member and a mounting piece with a hole, a part of the compensating member is fixed to the first part, and the mounting piece is disposed at an appropriate portion of the compensating member, the hole of the mounting piece is provided for insertion of the first end of the fixing rod, and one end of the elastic member which is away from the flange is abutted against the mounting piece. 
   
   
       7 . The buffering device for chair as claimed in  claim 6 , wherein an anti-disengagement bolt is disposed at the first end of the fixing rod. 
   
   
       8 . The buffering device for chair as claimed in  claim 5  further comprising a fixing nut, the mounting portion including a compensating member and two mounting pieces which are arranged at different heights, and each mounting piece having a hole, wherein a part of the compensating member is fixed to the first part, and the mounting pieces are disposed at appropriate portions of the compensating member, one end of the elastic member which is away from the flange is abutted against one of the mounting pieces which is close to the flange, the fixing rod is partially formed with a threaded section on which the fixing nut is engaged, a radial length of the respective fixing nuts is larger than a diameter of the hole of each of the mounting pieces, and the fixing nut is located between the two mounting pieces.