Debrayable set of hinge for motor vehicle seat.

The present invention relates to a disengageable joint comprising a first flange (2) comprising inner teeth, a second flange (3), an eccentric mechanism coupling said internal gear with external teeth (81), a clutch disc ( 6) rotatably connected with said second flange (3), a release member (5) operable in rotation and adapted to cause said clutch disk (6) in axial translation for passing said hinge assembly from a locked configuration wherein said outer teeth (81) and said second flange (3) are connected in rotation, to an unlocked configuration in which they are disengaged, said axial displacement being obtained by the cooperation of at least one boss (65) and a complementary shaped portion respectively located on said clutch disc (6) and said release member (5), said boss (65) extending so symetriq eu either side of a diametral plane passing through the axis of said second flange (3), and in a circumferential profile cocked hat.