Abstract: The hinge comprises a flange (26) for connection to a seat cushion or squab, a support-flange (38) and at least one lever (34d) for coupling the flanges (26, 38) together having a first end (36A) mounted to pivot on the support-flange (38) so that the coupling lever (34d) can pivot between a position in which a second end (36B) of the lever (34d) is attached to the connecting flange (26) by virtue of cooperation of complementary shapes and a position in which the second end (36B) is released. The hinge further comprises means (100-104) for immobilising the second end (36B) of the coupling lever in the attached position, preferably comprising a weakened area (104) of the support-flange (38) that can deform when the flanges (26, 38) are subjected to an accidental torque to enable movement of the lever (34d) to the point of cooperation of ramps (100, 102) immobilising the lever (34d) in the attached position.

Abstract: The hinge includes two flanges (24, 26) adapted to be fixed to a seat cushion and a seat squab (backrest), respectively. The flanges (24, 26) can turn relative to each other about a hinge axis (X) that is substantially perpendicular to them. The hinge additionally includes a hinge control member (32) mounted to rotate about the hinge axis (X) at least one way from a rest position and means for spring loading the control member into its rest position including approximate positioning means (76) and accurate positioning means (82) for the control member (32). The accurate positioning means preferably include at least one U-shape spring (82) in axial bearing engagement between the edge of a recess (88) of a bearing (P1) supporting the control member (32) and a positioning flat (90) of the control member (32).