Patent ID: 7014262
Filing Date: 2006-03-21
Classification: A47C

Abstract:
1. A device for tilting or synchronized chairs, comprising: a supporting frame; at least one mobile frame coupled with the supporting frame; an elastic member coupled with the mobile frame and the supporting frame; a stiffness adjustment mechanism coupled with the elastic member; a locking mechanism for engaging the mobile frame with the supporting frame; and an actuation device for engaging and disengaging the locking mechanism, wherein the actuation device may be selectively activated by a control knob, wherein the actuation device includes: a rocker arm coupled with the control knob that swings around a fulcrum; and a return arm that is generally rigid and non-deformable, the return arm is connected to the end of the rocker arm that the locking mechanism is attached; wherein the rocker arm has at least two positions of stable equilibrium that are determined by the engagement or disengagement of the locking mechanism; and wherein the rocker arm comprises a lever arm positioned between the fulcrum and the return arm, the rocker arm is adapted to undergo elastic deformation due to the effect of an operation of the control knob, which moves the rocker arm between the positions of stable equilibrium, and whenever during the operation of the device there are opposing forces on the locking mechanism that prevent the movement of the return arm, the accumulation of the elastic deformation energy in the rocker arm moves the return arm upon the decrease of the opposing forces.