Multi-position seat and its application especially to motor vehicles

Claim 1

A multi-position seat with a seat part (10) and a backrest (20), whereby the seat is movable between two extreme positions where said backrest (20) is substantially horizontal, a first extreme position in which said backrest is folded over said seat part, and a second extreme position in which the backrest is rearwardly reclined relative to said scat part, there being between said extreme positions a normal position, where said backrest (20) is substantially vertical, and a relaxation position where said backrest (20) is inclined relative to the vertical, wherein: said seat part (10) has a first moving framework (11) for a seat part cushion (12); and said backrest (20) has a second moving framework (21) for a backrest cushion (22); said multi-position seat comprising: an underframe (30) adapted to rest the seat on a floor; an articulation (40), connecting said underframe to said first and second frameworks (11, 21) and defining an axis (400), and making it possible to change the relative positions of said seat part cushion and said backrest cushion (12, 22); and a plurality of linkage rods (50) for automatically controlling the relative displacements of said seat part cushion and said backrest cushion (12, 22) during a change in their relative positions; wherein said linkage rods (50) comprise: a connecting rod (51) connecting, in an articulated manner, one (111) of two extremities (111, 112) of said seat part framework (11) to said underframe (30); and a connecting rod assembly (52) connecting, in an articulated manner, another (112) of said extremities (111, 112) of the seat part framework (11) to said backrest framework (21), and wherein said underframe (30) comprises at least one front leg (31), and wherein said connecting rod (51) connecting said seat part framework (11) to said underframe (30) is pivotally connected, at one end, in proximity to said one extremity (111) of the framework (11), and also, at another end, in proximity to said from leg (31); so that, in a first operating mode, when said backrest (20) passes from its normal position to its first extreme position, said seat part (10) has at least a part which remains in a substantially unchanged position so that said seat part cushion (12) faces said backrest cushion (22), and so that, in a second operating mode, when said backrest (20) passes from its normal position to its second extreme position, said articulation causes said said seat part (10) to change position so that the seat part cushion (12) comes practically into an about horizontal alignment with said backrest cushion (22), and vice versa.