Chair for a body-sensible acoustic device

Abstract

There is provided a lightweight chair for body-sensible acoustic device wherein each of the right and left sides of the chair is formed of a frame having a substantially parallelogram shape, and a front-leg arm and a rear-leg arm of each of the frames are arranged so that their tilt angles agree with that of the back portion of the chair. The back portion is pivotally mounted at the rear of upper side arms of the frames, and a seat portion is pivotally mounted at the upper portion of the front-leg arms. An electromechanical vibration transducer is affixed to the reverse side of the lumber portion of the chair so that the vibration direction becomes perpendicular to the back portion surface. Since the vibration direction of the transducer agrees with that of the frames, the frames do not interfere with the vibration of the chair, thereby enhancing the vibration efficiency.

What is claimed is:  
     
         1 . A chair for a body-sensible acoustic device, said chair comprising: 
 side portions which are provided at the right and left sides of said chair, and each of which is constituted of a frame having four sides;    said frame being formed into a parallelogram shape wherein the front-leg arm and rear-leg arm of said chair are tilted backward;    a back portion pivotally mounted to the rear portion of an upper side arm of each of said frames;    a seat portion pivotally mounted to the upper portion of each of said front-leg arms;    an electromechanical vibration transducer affixed to the lower part on the reverse side of the back portion so that the vibration direction thereof is substantially perpendicular to the surface of the back portion; and    the backward tilt angle of said back portion being made substantially the same as the tilt angles of said front-leg arm and rear-leg arm of each of said frames.    
     
     
         2 . The chair for a body-sensible acoustic device, said chair comprising: 
 side portions which are provided at the right and left sides of said chair, and each of which is constituted of a frame having four sides;    said frame being formed into a parallelogram shape wherein the front-leg arm and rear-leg arm of said chair are tilted backward;    a back portion pivotally mounted to the rear portion of an upper side arm of each of said frames;    a seat portion pivotally mounted to the upper portion of each of said front-leg arms;    the backward tilt angle of said back portion being made substantially the same as the tilt angles of said front-leg arm and rear-leg arm of each of said frames; and    an electromechanical vibration transducer affixed to said rear-leg arm so that the vibration direction thereof is substantially perpendicular to the surface of the back portion.