Patent ID: 8973995
Filing Date: 2015-03-10
Classification: A47C

Abstract:
1. Device for synchronizing the tilt of a chair back and seat, of the type comprising a frame of the chair back, a frame of the seat and a support integral with the base of said chair, as well as at least one first crank, integral with said frame of the chair back, and hinged at the rear to said frame of the seat and to said support, and at least one second crank, hinged at the front to said frame of the seat and to said support, said at least one first crank and said at least one second crank, with said frame of the seat, determining an articulated quadrilateral, wherein said at least one first crank and said at least one second crank lie substantially on skew lines, wherein both the hinge point of said at least one second crank to the frame of the seat and the hinge point of said at least first crank to said frame of the seat raise during rotation of the frame of the seat from said initial position to said final position whereby said frame of the seat moves towards said frame of the chair back, and wherein said frame of the seat is movable between an initial position, corresponding to the lowest tilt of said frame of the chair back, and a final position, corresponding to the highest tilt of said frame of the chair back, the hinge point of said at least one second crank to the frame of seat being substantially at the same elevation as the elevation of the hinge point of said at least one first crank to the frame of the seat, when said frame of the seat is in its initial position, and the hinge point of said at least one second crank being at a higher elevation relative to the elevation of the hinge point of said at least one first crank to the frame of the seat, when said frame of the seat is in its final position, and wherein said at least one first crank and said at least one second crank are a swivel body interconnecting a fixed pin to a movable pin.