Chair adjustment device

Abstract

A chair adjustment device has a U-shaped frame, a first connection plate having a first round hole, a first circular aperture, and a second circular aperture, a second connection plate having a second round hole, a first driven block having a through hole, a protruded bar, and a protrusion, and a second driven block having a through aperture. A shaft passes through the through aperture, the second round hole, the first round hole, and the through hole. A click gear is disposed in the first driven block. A click pawl has a first round aperture and a second round aperture. A compression spring is inserted in the circular aperture and the first round aperture. A rivet passes through the first circular aperture and the second round aperture. The click pawl engages with the click gear.

I claim:  
     
         1 . A chair adjustment device comprises 
 a U-shaped frame, a first connection plate disposed on a first side of the U-shaped frame, a second connection plate disposed on a second side of the U-shaped frame, a first driven block covering the first connection plate, and a second driven block covering the second connection plate,    the first connection plate having a first round hole, a first circular aperture, and a second circular aperture,    the second connection plate having a second round hole,    the first driven block having a through hole, a protruded bar, and a protrusion,    the second driven block having a through aperture,    a shaft passing through the through aperture of the second driven block, the second round hole of the second connection plate, the first round hole of the first connection plate, and the through hole of the first driven block,    a click gear disposed in the first driven block,    a click pawl having a first round aperture and a second round aperture,    a compression spring having a first end inserted in the circular aperture of the first connection plate and a second end inserted in the first round aperture of the click pawl,    a rivet passing through the first circular aperture of the first connection plate and the second round aperture of the click pawl to fasten the first connection plate and the click pawl together, and    the click pawl engaging with the click gear.